Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises semisteel; lance position of the oxygen lance moves within 1.5-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.95-2.05m, blowing lance position is 1.5-2.2m and catch carbon lance position is 1.7-1.75m; wherein, the auxiliary materials comprise compound slag, lime and high-magnesium lime; in every ton of semisteel, 17-20kg of the compound slag is used, 30-34.5kg of lime is used, 30-34.5kg of high-magnesium lime is used, a total of 43-53 cubic meters of oxygen is blown into the furnace; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when the oxygen ...

Alloying material for smelting vanadium-manganese-containing alloy steel and preparation method thereof

Mounting and locating method for changeable air brick

The invention relates to an installation and positioning method for a replaceable permeable brick. The method comprises the following steps: the installation position of an installation flange is determined; the installation flange is fixed at the bottom of a converter; the permeable element of the permeable brick are fixed on the installation flange, and the central line of the permeable element and the central line of the installation flange are coincident; and the brick cup and the sleeve brick of the permeable brick are sleeved on the permeable element. The steps of determining the installation position of installation flange are as follows: determining the vertical central line of the spherical bottom of the converter; determining the vertical distance between the central point of the upper end surface of the installation flange and the vertical central line of the spherical bottom of the converter; and determining the vertical distance between the central point of the lower end surface ...

Oxygen top-blown converter steelmaking method

The invention relates to an oxygen top-blown converter steelmaking method. The method comprises the following steps: adding steel raw materials to a converter; blowing oxygen to the converter through an oxygen lance; and feeding auxiliary materials to the converter in batches in the process of blowing the oxygen, wherein the steel raw materials contain semisteel; the oxygen lance moves within a range of 1.4 to 2.2 meter above the level of molten steel in the converter, namely the blowing position is 1.9 to 2.1 meters, the converting position is 1.5 to 2.2 meters, and the catch-carbon positionis 1.4 to 1.45 meters; the auxiliary materials comprise composite slag, lime and high-magnesium lime with the contents of 14.8 to 16.1 kilograms, 14.8 to 22.2 kilograms and 26.1 to 29.5 kilograms respectively in each half ton of steel; the total of amount of the blown oxygen is 40 to 50 cubic meters; and on the basis of the total of amount of the blown oxygen, the first batch of auxiliary material is ...

Converter final-slag modifier and use thereof

The invention relates to a converter final-slag modifier and a use thereof, and belongs to the technical field of metallurgy. The invention provides the converter final-slag modifier and the use thereof. Active components of the converter final-slag modifier comprise, by weight, 13.5-37.5 parts of CaO, 2.4-7.5 parts of SiO2, 15-35 parts of MgO and 4-14 parts of C. The converter final-slag modifier can effectively reduce total iron content of furnace slag produced by semi-steel converter melting. The furnace slag modified by the converter final-slag modifier has total iron content reduced to 16%. Fly ash, steelmaking mud, waste magnesia brick, anthraciferous coal and a binder are mixed according to a certain ratio and are subjected to pressing ball to form balls of the converter final-slag modifier can be prepared so that secondary resource comprehensive utilization is realized. The converter final-slag modifier has a low cost and good modification effects and can effectively reduce iron ...

Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.4-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.7m and catch carbon lance position is 1.4-1.5m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when the oxygen blowing content is 0.5-5%; the method of the invention is suitable for smelting high-level steel grade which has high requirements on P and S in a manner of large quantity ...

Novel pile foundation engineering slag removal device

The utility model discloses a novel pile foundation engineering slag removing device which comprises a machine frame, the machine frame is provided with stand columns located on the two sides, a cross beam is arranged between the two stand columns, a sliding block is arranged on the cross beam, a first inhaul cable is arranged at the left end of the sliding block, and a second inhaul cable is arranged at the right end of the sliding block. The free end of the second inhaul cable bypasses the second reversing part and then extends to the ground, a winding assembly is arranged at the bottom of the sliding block, each stand column is provided with a wire tightener, each wire tightener is provided with a threaded rod, and each threaded rod is sequentially provided with a spring, a lantern ring, a nut and an end cover from inside to outside. After sliding in place, the end portion of the first inhaul cable and the end portion of the second inhaul cable are fixed through the tightener, and stability ...

Explosion prevention method of molten steel in combined blowing converter

The invention belongs to the production field of combined blowing converter steelmaking, particularly relates to an explosion prevention method of molten steel in a combined blowing converter, which solves the technical problem that when oxygen lance cooling water leaks in the combined blowing converter, the emergent precautionary measure of stopping the supply of gas is taken in order to prevent cooling water from being involved into the molten steel to cause explosion in the converter and give rise to incidents about production safety and personnel safety. The method comprises the following steps: the difference of inflow and outflow of the oxygen lance cooling water is used for determining whether to stop bottom blowing gas supply or not; when the difference is larger than or equal to 20t/h, the oxygen lance automatically lifts and stops supplying oxygen; emergency treatment button is started, bottom blowing oxygen supply is stopped, and the inlet source of the oxygen lance is cut off ...

Method for producing low phosphorus steel by smelting semisteel

The invention belongs to the field of metallurgy, and relates to a method for producing low phosphorus steel by smelting semisteel, which solves the technical problem of controlling the steelmaking end point of a converter within 0.006 percent. The method is mainly realized by adjusting slag-making parameters of the converter smelting by adopting a single slag method, which comprises that: the slag-making materials added in the converter slag-making process consist of 40-50kg of active lime, 20-30kg of high-magnesium lime and 15-25kg of composite slag former based on per ton of tapping molten steel; and the slag-making materials are added in twice. In addition, by controlling an oxygen supply system and an end point control system, the dephosphorization rate of the converter can reach over 92 percent; molten steel containing less than 0.006 percent of phosphorus is obtained; steel ladle slag de-P and alloy re-P are controlled within 0.002 percent. The method can stably produce finished ...

Composite slagging agent for semi-steel making and preparation method thereof and semi-steel making method

The invention provides a composite slagging agent for semi-steel making. The composite slagging agent contains iron oxide, MnO and SiO2, wherein the iron oxide is Fe2O3 and/or FeO. The invention also provides a preparation method for the composite slagging agent and a semi-steel making method. According to the composite slagging agent provided by the invention for semi-steel making, the preparation method is simple, the consumption of the composite slagging agent in the semi-steel making process is low, and the composite slagging agent can be used for slagging and dephosphorization in the semi-steel making so that the semi-steel making process is performed more smoothly; and meanwhile, the composite slagging agent can effectively improve the Mn element content of the final molten steel and correspondingly reduce the consumption of Mn-containing alloy added in a subsequent step of the steel making production so as to reduce the steel making production cost.

Efficient slag removal equipment for pile foundation engineering

The utility model discloses pile foundation engineering efficient slag removal equipment which comprises a rack, the rack is provided with stand columns located on the two sides, a cross beam is arranged between the two stand columns, a sliding block is arranged on the cross beam, a first inhaul cable is arranged on the left side of the sliding block, one end of the first inhaul cable is connected to the sliding block, and the other end of the first inhaul cable extends towards the ground after bypassing a first reversing part. A second inhaul cable is arranged on the right side of the sliding block, one end of the second inhaul cable is connected to the sliding block, the other end of the second inhaul cable bypasses the second reversing part and then extends towards the ground, a winding assembly is arranged at the bottom of the sliding block, an oil hole is formed in the top of the sliding block, an oil hole oil storage part is arranged in the oil hole, an oil hopper is arranged at an ...

Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.4-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.7m and catch carbon lance position is 1.4-1.5m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime; with the total content of the blown oxygen as a benchmark, the first batch of auxiliarymaterials are added when the oxygen blowing content is 0.5-5%; the method of the invention is suitable for smelting high-level steel grade which has high requirements on P and S in a manner of largequantity ...

Vanadium-silicon alloy, and preparation and application thereof

The invention provides a V-Si alloy and a preparation method and an application method thereof. The preparation method of the V-Si alloy comprises the following steps: rough vanadium slag is fragmentated and magnetic dressed to obtain fine vanadium slag containing 15 to 20 percent of V2O5 and 22 to 30 percent of TFe, and the fine vanadium slag and silicon material and a reducing agent are used as the materials and evenly dosed according to a certain proportion, and then mixed pellets are obtained; the obtained pellets and a slag modifier agent are reduced by melting in an ore-smelting electric furnace for 150 to 180 min, with the final temperature of 1630 to 1680 DEG C, and finally the V-Si alloy with 8 to 15 percent of vanadium and 30 to 50 percent of vanadium silicon are obtained. By using the V-Si alloy of the invention as the alloying material for the smelting alloy steel containing vanadium and silicon, the technological process is shortened, and the production cost and the energy ...

Bottom blowing ventilating structure of combined-blowing revolving furnace

The invention discloses a bottom blowing gas-permeable structure of a combined blowing converter in the top and bottom combined blowing technical field and a production method thereof. The structure comprises a gas-permeable brick, and a gas outlet of the gas-permeable brick is overlapped with at least two gas-permeable protective layers formed by mending materials with different substances. The structure greatly decreases the erosive velocity of the gas-permeable brick and prolongs the service life of the gas-permeable brick. The production method for the structure comprises the steps that: a. after the gas outlet of the gas-permeable brick is eroded to form a pit, a mending material is filled into the pit and is solidified to form the first gas-permeable protective layer at the gas outlet of the gas-permeable brick; and b. after the first gas-permeable protective layer is eroded to form a pit, and a mending material with the other substance is filled into the pit and is solidified to ...

Microfluidic chip and preparation method thereof

The invention discloses a microfluidic chip and a preparation method thereof, the microfluidic chip is used for detecting high-flux single cell intrinsic electrical parameters of adherent cells, the microfluidic chip comprises a first chip and a second chip, the surface of the first chip is provided with a detection electrode, the detection electrode comprises a detection end and an information end, the detection end is provided with a plurality of electrode units, and the information end is connected with the detection electrode. Each electrode unit is used for detecting intrinsic electrical parameters of a single adherent cell, the information end is used for transmitting an electrical signal of the detection end to the outside, the second chip is attached to the surface of the first chip, a microfluid channel is formed in the second chip, a liquid inlet, a cell detection area and a liquid outlet are sequentially formed in the microfluid channel, and the liquid inlet is communicated with ...

Converter final slag modifier, preparation method thereof and converter steelmaking method

The invention discloses a converter final slag modifier, a preparation method thereof and a converter steelmaking method. The converter final slag modifier contains 3.5-12.5wt% of CaO, 1.5-6.5wt% of SiO2, 35-45wt% of MgO, 0.5-1.5wt% of Al2O3, 4-14wt% of SiC and 29.5-46.5wt% of TFe. The converter final slag modifier is added in a simple manner and is capable of effectively reducing the iron loss of the final slag and the slag charging amount of the converter. Besides, secondary resource fly ash and used magnesia bricks are utilized for preparing the converter final slag modifier, and therefore, the preparation method is capable of realizing comprehensive utilization of secondary resources, and as a result, the method is also capable of reducing the cost of the modifier.

Adsorption flow grinding and polishing method

The invention discloses an adsorption flow grinding and polishing method which mainly solves the problems that an existing polishing method is extremely low in automation degree, complex to realize, low in machining efficiency and the like. The adsorption flow grinding and polishing method comprises the following steps that (1) an element to be machined is soaked into starch mixed liquor and the element to be machined is immersed in the liquor face; (2) an adsorption pipe connected with an adsorption instrument is stretched into the position under the starch mixed liquor and a pipe orifice of the adsorption pipe is 0.5mm to 1mm away from the element to be machined; (3) the adsorption pipe is fixed, the adsorption instrument is stated, the starch mixed liquor is quickly adsorbed away, the starch mixed liquor flows, friction between the starch mixed liquor and the surface of the element to be machined is generated, so that grinding force is produced, and polishing machining of the element ...

Composition for slag formation and preparation and use method thereof

The invention provides a composition for slag formation, which comprises the following components based on the total weight of the composition: 45-65wt% of CaO, 10-20wt% of SiO2, 1-5wt% of MnO, 9-25wt% of MgO and 1.5-5wt% of Al2O3. The invention also provides a preparation method and a use method of the composition. The composition for slag formation provided by the invention can promote slagging in the early stage of smelting semisteel, shorten the slag formation time, and obviously remove phosphorus elements. By adopting the composition for slag formation of the invention for smelting the semisteel, the process is simple, the energy consumption is low, the effect of reducing phosphorus is obvious, the phosphorus content in molten steel is lower than 0.007wt%, and consumption of the semisteel is small when the same amount of steel is obtained by smelting.

A centering copper pipe for optical element mechanical centering cut edge

The utility model discloses a centering copper pipe for optical element mechanical centering cut edge, its characterized in that: this centering copper pipe is including T type centering copper pipe body, T type centering copper pipe body is including centering end and two parts of stiff end, and be provided with the through -hole in the middle of the T type centering copper pipe body, be provided with the screw thread of being connected with the equipment main shaft on the great through -hole inner wall of stiff end department, centering end top is provided with circular or oval pressure head, this pressure head has fixed camber, because optical element is the component for having certain fixed curvature radius also, then the pressure head approaches zero with the tangent slope of optical element contact department, optical element's atress is even, it is can not the generate pressure too big, thereby realize the protection to optical element, can not the too big and fried phenomenon of ...

Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages; the method is characterized in that steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.35-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.8m and catch carbon lance position is 1.35-1.45m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime relative to every ton of molten iron containing vanadium and titanium, the first batch of auxiliary materials are added when the oxygen blowing content is 0.5-3.5%; the method of the invention is suitable for smelting low-level steel grade which has undemanding requirements on P and S by vanadium-and-titanium-containing ...

Composition for slag formation and preparation and use method thereof

The invention provides a composition for slag formation, which comprises the following components based on the total weight of the composition: 45-65wt% of CaO, 10-20wt% of SiO2, 1-5wt% of MnO, 9-25wt% of MgO and 1.5-5wt% of Al2O3. The invention also provides a preparation method and a use method of the composition. The composition for slag formation provided by the invention can promote slaggingin the early stage of smelting semisteel, shorten the slag formation time, and obviously remove phosphorus elements. By adopting the composition for slag formation of the invention for smelting the semisteel, the process is simple, the energy consumption is low, the effect of reducing phosphorus is obvious, the phosphorus content in molten steel is lower than 0.007wt%, and consumption of the semisteel is small when the same amount of steel is obtained by smelting.

Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises semisteel; lance position of the oxygen lance moves within 1.5-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.95-2.05m, blowing lance position is 1.5-2.2m and catch carbon lance position is 1.7-1.75m; wherein, the auxiliary materials comprise compound slag, lime and high-magnesium lime; in every ton of semisteel, 17-20kg of the compound slag is used, 30-34.5kg of lime is used, 30-34.5kg of high-magnesium lime is used, a total of 43-53 cubic meters of oxygen is blown into the furnace; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when theoxygen ...

Maintenance method of gas permeable brick of vanadium extraction converter and production method of converter vanadium extraction

The invention provides a maintenance method of gas permeable bricks of a vanadium extraction converter. The method comprises the steps of repairing spray repair furnace charge to the erosion positionsof the gas bricks and then sintering the spray repair furnace charge. The invention also provides a production method of a converter vanadium extraction, which comprises carrying out vanadium extraction and the maintenance on the converter. The method of the maintenance of the converter comprises the maintenance of the gas permeable bricks of the converter, which comprises the deducting and repairing of the gas permeable bricks of the converter, wherein the maintenance of the gas permeable bricks of the converter also comprises the spray repairing of the gas permeable bricks of the converter,and the method of the spray repairing of the gas permeable bricks of the converter is the maintenance of the gas permeable bricks of the converter. The method can promote the converter to keep running in ...

Oxygen top blown converter steel making method

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages; the method is characterized in that steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.35-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.8m and catch carbon lance position is 1.35-1.45m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime relative to every ton of molten iron containing vanadium and titanium, the first batch of auxiliary materials are added when the oxygen blowing content is 0.5-3.5%; the method of the invention is suitable for smelting low-level steel grade which has undemanding requirements on P and S by vanadium-and-titanium-containing ...

Method for preparing alloying material for smelting vanadium-manganese-containing alloy steel and method for smelting vanadium-manganese-containing alloy steel

The invention provides alloying materials used for smelting alloy steel containing vanadium and manganese and preparation method thereof, which pertains to the metallurgical field. The vanadium ferromanganese alloy contains 8 percent-12 percent V and 40 percent-65 percent manganese. The preparation method is: a. V2O5 with 15 percent-25 percent content, fine vanadium slag with 22 percent-30 percent TFe content, manganese ore or manganese-rich slag with 25 percent-35 percent TMn content and reducing agent are mixed and made into pellets; b. the pellets prepared in step a and slag modifiers are reduced to obtain the vanadium ferromanganese alloy with 8-12 percent V and 40-65 percent Mn through melting by an ore heating furnace. The alloying materials of the invention can be used for alloyingthe alloy steel containing vanadium and manganese in the steel field, so as to replace ferrovanadium and ferromanganese, reduce production cost of the alloy steel containing vanadium and manganese and optimize ...

Oxygen top-blown converter steelmaking method

The invention relates to an oxygen top-blown converter steelmaking method. The method comprises the following steps: adding steel raw materials to a converter; blowing oxygen to the converter through an oxygen lance; and feeding auxiliary materials to the converter in batches in the process of blowing the oxygen, wherein the steel raw materials contain semisteel; the oxygen lance moves within a range of 1.4 to 2.2 meter above the level of molten steel in the converter, namely the blowing position is 1.9 to 2.1 meters, the converting position is 1.5 to 2.2 meters, and the catch-carbon position is 1.4 to 1.45 meters; the auxiliary materials comprise composite slag, lime and high-magnesium lime with the contents of 14.8 to 16.1 kilograms, 14.8 to 22.2 kilograms and 26.1 to 29.5 kilograms respectively in each half ton of steel; the total of amount of the blown oxygen is 40 to 50 cubic meters; and on the basis of the total of amount of the blown oxygen, the first batch of auxiliary material ...

Method for alloying vanadium in molten steel by using ferrovanadium fine powder in RH station

The invention belongs to the field of metallurgy of iron and steel, in particular relates to a method for alloying vanadium in molten steel by using ferrovanadium fine powder in an RH station. The method solves the technical problem that fine powder containing vanadium is difficult to be utilized effectively. The invention aims to provide a method for alloying molten steel by using FeV50 fine powder with the granularity of 5-15 millimeters in an RH molten steel refining station. The method not only has no effect on a steel making mission and a production organization, but also ensures that the FeV50 fine powder resource with the granularity of 5-15 millimeters can be fully utilized. The method has the characteristics of simple operation, easy control, high yield of metal vanadium, and thelike. The invention provides a new selection for fully and effectively utilizing the vanadium resource and reducing the production cost in the steel making process.

Method for extracting vanadium slag from ultra-low vanadium-containing molten iron by using converter

The invention provides a method for extracting vanadium slag from ultra-low vanadium molten iron by utilizing a converter. The method includes the steps as follows: devulcanized molten iron containing 0.14 to 0.20 percent of vanadium is converted into the converter; then an oxide containing ion is added into the devulcanized molten iron; a top lance is arranged at the upper side of a molten iron level; then oxygen is blown; after the oxygen blowing is stopped, a carbon reducer is added and then a furnace is rocked; and after converting is stopped, the vanadium slag and semi-steel molten iron are obtained. The valuable element-vanadium in the molten iron can be ensured to be effectively extracted according to the method, moreover, the invention provides an important material for the production of low-sulfur steel.

Bottom blowing ventilating structure of combined-blowing revolving furnace

The invention discloses a bottom blowing gas-permeable structure of a combined blowing converter in the top and bottom combined blowing technical field and a production method thereof. The structure comprises a gas-permeable brick, and a gas outlet of the gas-permeable brick is overlapped with at least two gas-permeable protective layers formed by mending materials with different substances. The structure greatly decreases the erosive velocity of the gas-permeable brick and prolongs the service life of the gas-permeable brick. The production method for the structure comprises the steps that: a. after the gas outlet of the gas-permeable brick is eroded to form a pit, a mending material is filled into the pit and is solidified to form the first gas-permeable protective layer at the gas outlet of the gas-permeable brick; and b. after the first gas-permeable protective layer is eroded to form a pit, and a mending material with the other substance is filled into the pit and is solidified to ...

Hand detergent containing natural antibacterial component

The invention belongs to the technical field of chemicals of daily use and discloses a hand detergent. According to a formula, the hand detergent comprises the following specific components by mass: 0.1-9.9% of sodium dodecyl sulfate (SDS), 0.1-9.9% of sodium alcohol ether sulphate (AES), 0.5-12.0% of glycerol, 0.01-1.0% of glycerol triacetate, 0.01-1.0% of glycerol monocaprylate, 0.5-7.0% of carboxymethyl cellulose, 0.5-8.0% of agar, 1.0-15.0% of a winter jasmine flower extract, an appropriate amount of citric acid and sodium citrate which serve as pH regulators and the balance of distilled water. The winter jasmine flower extract serves as the bacteriostatic agent of the hand detergent, can guarantee the detergency of the hand detergent and has the effects of moistening the hand skin and inhibiting and killing bacteria.

Process of extracting Cr-V oxide from high Cr, V and magnetite ore

The process of extracting Cr2O3 and V2O5 from high-chromium vanadium titanium magnetite includes the following steps: 1. smelting molten iron containing V 0.28- 0.50 wt% and Cr 0.5-2.5 wt% with high-chromium vanadium titanium magnetite in a blast furnace or an electric furnace; 2. air refining the molten iron to obtain V-Cr slag with V2O5 not less than 6 wt% and Cr2O3 not less than 15 wt%, and semisteel; and 3. separating V2O5 from the V-Cr slag through crushing, roasting, leaching and purifying; adding ammonium salt into separated liquid and regulating pH value to 2-10, so as to prepare Cr2O3. The present invention recovers and utilizes valuable metal from molten iron without affecting iron and steel production.

Method for lowering converter bottom

The invention provides a method for lowering converter bottom, comprising the following steps: (1) pouring out final slag in a converter after tapping of molten steel; (2) adding semisteel and/or molten iron, fluorite and compound fluxing medium into the converter, and using oxygen to carry out slide blowing; (3) adding high-magnesium lime and/or final slag regulator to the converter, and using nitrogen for blowing; (4) pouring out slag in the converter. The method of the invention features easy operation and not only ensures furnace protection effect of splashed slag but also ensures the effect of combined blowing; regular use of the method of the invention for maintaining the converter can maintain stable and normal operation thereof.

Semi-steel steelmaking method

The invention discloses a semi-steel steelmaking method, wherein the method comprises the steps of: adding raw materials into a steel making furnace, blowing oxygen into the furnace to obtain molten steel and slag; the raw materials comprises raw steel, lime, high-magnesium lime and acid composite slag; the raw steel contains semi-steel after vanadium extraction; the addition of the acid composite slag meets the following formula: W (acid composite slag) is equal to (( (CaO (lime) plus CaO (high-magnesium lime) minus SiO2 (oxidized semi-steel) multiplied by R) divided by R ) divided by SiO2% (acid composite slag) ) multiplied by K, wherein W acid composite slag refers to the addition of the acid composite slag, CaO lime refers to the quantity of CaO brought in by the lime, CaO high-magnesium lime refers to quantity of CaO brought in by the high-magnesium lime, SiO2 oxidized semi-steel refers to the quantity of SiO2 converted from the quantity of Si element in the semi-steel, R refers to ...

Method for lowering converter bottom

The invention provides a method for lowering converter bottom, comprising the following steps: (1) pouring out final slag in a converter after tapping of molten steel; (2) adding semisteel and/or molten iron, fluorite and compound fluxing medium into the converter, and using oxygen to carry out slide blowing; (3) adding high-magnesium lime and/or final slag regulator to the converter, and using nitrogen for blowing; (4) pouring out slag in the converter. The method of the invention features easy operation and not only ensures furnace protection effect of splashed slag but also ensures the effect of combined blowing; regular use of the method of the invention for maintaining the converter can maintain stable and normal operation thereof.

Semi-steel steelmaking method

The invention discloses a semi-steel steelmaking method, wherein the method comprises the steps of: adding raw materials into a steel making furnace, blowing oxygen into the furnace to obtain molten steel and slag; the raw materials comprises raw steel, lime, high-magnesium lime and acid composite slag; the raw steel contains semi-steel after vanadium extraction; the addition of the acid compositeslag meets the following formula: W (acid composite slag) is equal to (( (CaO (lime) plus CaO (high-magnesium lime) minus SiO2 (oxidized semi-steel) multiplied by R) divided by R ) divided by SiO2% (acid composite slag) ) multiplied by K, wherein W acid composite slag refers to the addition of the acid composite slag, CaO lime refers to the quantity of CaO brought in by the lime, CaO high-magnesium lime refers to quantity of CaO brought in by the high-magnesium lime, SiO2 oxidized semi-steel refers to the quantity of SiO2 converted from the quantity of Si element in the semi-steel, R refers to ...

Method for producing low phosphorus steel by smelting semisteel

The invention belongs to the field of metallurgy, and relates to a method for producing low phosphorus steel by smelting semisteel, which solves the technical problem of controlling the steelmaking end point of a converter within 0.006 percent. The method is mainly realized by adjusting slag-making parameters of the converter smelting by adopting a single slag method, which comprises that: the slag-making materials added in the converter slag-making process consist of 40-50kg of active lime, 20-30kg of high-magnesium lime and 15-25kg of composite slag former based on per ton of tapping moltensteel; and the slag-making materials are added in twice. In addition, by controlling an oxygen supply system and an end point control system, the dephosphorization rate of the converter can reach over 92 percent; molten steel containing less than 0.006 percent of phosphorus is obtained; steel ladle slag de-P and alloy re-P are controlled within 0.002 percent. The method can stably produce finished low ...

Semisteel converter steelmaking method

The invention relates to a semisteel converter steelmaking method, which comprises the following steps of: adding semisteel and a slag former into a converter successively and performing oxygen blowing and end point control. The method is characterized by also comprising a step of adding manganese ore into the converter. The method does not influence the steel production process and production organization and ensures dephosphorization and decarburization effects of converter steelmaking and the increase of the manganese content of end-point molten steel. The method has the characteristics of low energy consumption, simple operation, easy control and the like, reduces the using amount of ferromanganese during rear alloying and the production cost of the converter steelmaking, and saves energy and reduces energy consumption in the steelmaking process.

Quartz crystal resonator, preparation and application thereof

The invention relates to a gas sensor, in particular to a quartz crystal resonator which is sensitive to ethanol, and preparation and application thereof, comprising an AT-cut quartz wafer and a gold electrode fixed on the quartz wafer, wherein, the outer surface of the gold electrode and/or the quartz wafer is coated with an ionic liquid membrane. The resonator is applied to a conventional QCM sensor to prepare a QCM ethanol gas sensor, and the operation principle is the quartz crystal microbalance technology; the response frequency of the sensor is reduced with the fractional increase of the surface quality of the resonator caused by the absorption of the ethanol gas on the surface of a sensitive membrane of the quartz resonator, and the reduced value of the frequency and the concentration of the ethanol gas are linear. The gas sensor has the advantages of simple structure, small size, fast and real-time response, high sensitivity, good selectivity, no need of analog to digital conversion ...

Composite vanadium extraction and dephosphorization agent for vanadium-containing molten iron and preparation thereof

The invention discloses a composite vanadium extraction and dephosphorization agent for vanadium-bearing molten iron and a method for preparing the same. The composite vanadium extraction and dephosphorization agent comprises the following compositions in percentage by weight: 0 to 30 percent of CaO, 40 to 65 percent of TFe, 3 to 15 percent of SiO2, 0 to 15 percent of MgO, 0 to 15 percent Al2O3 of and the balance being impurity. Through utilizing the composite vanadium extraction and dephosphorization agent, the pretreatment of vanadium extraction and dephosphorization can be carried out to the vanadium-bearing molten iron by one-step operation, thereby extracting a beneficial element of vanadium and acquiring low-phosphorus semisteel.

Method for determining benzene series substances in atmosphere

The invention discloses a method for quickly determining benzene series substances in atmosphere. The method comprises the following steps: taking a hydrophobic ionic liquid material which is specifically sensitive to the benzene series substances as a sensitive coating material of a sensing element of a sensor based on mass-sensitive piezoelectric sensing technology, and obtaining the concentration of measured gas in a gas phase by detecting a frequency reduction value caused by the increase of trace mass caused by a measured object which is reversibly absorbed on a film of a resonator of the sensor. The method for determining the benzene series substances has the advantages of simple equipment structure, small volume, low cost, high sensitivity, good selectivity, quick response speed and the like, which particularly meets the need of field real-time and on-line monitoring.

Method for alloying vanadium in molten steel by using ferrovanadium fine powder in RH station

The invention belongs to the field of metallurgy of iron and steel, in particular relates to a method for alloying vanadium in molten steel by using ferrovanadium fine powder in an RH station. The method solves the technical problem that fine powder containing vanadium is difficult to be utilized effectively. The invention aims to provide a method for alloying molten steel by using FeV50 fine powder with the granularity of 5-15 millimeters in an RH molten steel refining station. The method not only has no effect on a steel making mission and a production organization, but also ensures that the FeV50 fine powder resource with the granularity of 5-15 millimeters can be fully utilized. The method has the characteristics of simple operation, easy control, high yield of metal vanadium, and the like. The invention provides a new selection for fully and effectively utilizing the vanadium resource and reducing the production cost in the steel making process.

Mounting and locating method for changeable air brick

The invention relates to an installation and positioning method for a replaceable permeable brick. The method comprises the following steps: the installation position of an installation flange is determined; the installation flange is fixed at the bottom of a converter; the permeable element of the permeable brick are fixed on the installation flange, and the central line of the permeable elementand the central line of the installation flange are coincident; and the brick cup and the sleeve brick of the permeable brick are sleeved on the permeable element. The steps of determining the installation position of installation flange are as follows: determining the vertical central line of the spherical bottom of the converter; determining the vertical distance between the central point of the upper end surface of the installation flange and the vertical central line of the spherical bottom of the converter; and determining the vertical distance between the central point of the lower end surface ...

Composite vanadium extraction and dephosphorization agent for vanadium-containing molten iron and preparation thereof

The invention discloses a composite vanadium extraction and dephosphorization agent for vanadium-bearing molten iron and a method for preparing the same. The composite vanadium extraction and dephosphorization agent comprises the following compositions in percentage by weight: 0 to 30 percent of CaO, 40 to 65 percent of TFe, 3 to 15 percent of SiO2, 0 to 15 percent of MgO, 0 to 15 percent Al2O3 ofand the balance being impurity. Through utilizing the composite vanadium extraction and dephosphorization agent, the pretreatment of vanadium extraction and dephosphorization can be carried out to the vanadium-bearing molten iron by one-step operation, thereby extracting a beneficial element of vanadium and acquiring low-phosphorus semisteel.

Maintenance method of gas permeable brick of vanadium extraction converter and production method of converter vanadium extraction

The invention provides a maintenance method of gas permeable bricks of a vanadium extraction converter. The method comprises the steps of repairing spray repair furnace charge to the erosion positions of the gas bricks and then sintering the spray repair furnace charge. The invention also provides a production method of a converter vanadium extraction, which comprises carrying out vanadium extraction and the maintenance on the converter. The method of the maintenance of the converter comprises the maintenance of the gas permeable bricks of the converter, which comprises the deducting and repairing of the gas permeable bricks of the converter, wherein the maintenance of the gas permeable bricks of the converter also comprises the spray repairing of the gas permeable bricks of the converter, and the method of the spray repairing of the gas permeable bricks of the converter is the maintenance of the gas permeable bricks of the converter. The method can promote the converter to keep running ...