Method for prolonging life of vanadium-and-titanium-containing semi-steel making converter
A method for prolonging the life of a vanadium-and-titanium-containing semi-steel making converter comprises the steps as follows: scrap steel is loaded in the converter, then semi-steel is poured, slag making materials are added, an oxygen lance is inserted into the converter from the top of the converter, oxygen is blown in, decarburization, dephosphorization and desulphurization processes are performed to obtain molten steel, and oxygen supply intensities and lance positions of the oxygen lance are as follows: when oxygen blowing is started for 60 s, the oxygen supply intensity is 1.75-2m<3>/min.t, and the lance position is 1900-2200 mm; when oxygen blowing is started for 60-90 s, the oxygen supply intensity is 2.5-2.92 m<3>/min.t, and the lance position is 1600-1900 mm; and after oxygen blowing is started for 90 s, the oxygen supply intensity is 3.42-3.75 m<3>/min.t, and the lance position is 1400-1700 mm. By means of the method, the problems of corrosion caused by the molten steel to a converter lining, explosion venting of converter dry dedusting, pipeline scaling and the like can be effectively solved; and the life of the converter with the method is prolonged to about 6000 times from original 1478 times. 1. A vanadium-titanium-containing method of semi-steel steel making converter, the method comprises the the scrap into the furnace, then poured into a semi-steel, adding slag forming material, the inserted into the furnace from the top of the oxygen lance, insufflating the oxygen, decarbonizates, phosphorus, sulfur process, in order to obtain molten steel, characterized in that adjusting the oxygen lance oxygen supply intensity and position of the: Blowing oxygen to 60 seconds, the oxygen supply intensity for 1.75-2m3/min·t, gun -1900-2200mm; Start blowing 60-90 seconds, the oxygen supply intensity for 2.5-2.92m3/min·t, gun -1600-1900mm; Start blowing 90s the rear, the oxygen supply intensity for 3.42-3.75m3/min·t, gun -1400-1700mm. 2. Method according to Claim 1, characterized in that the oxygen flow and is a manually-adjusted control or under automatic control of the automatic control module. 3. Method according to Claim 1, characterized in that the half of the weight of the scrap weight of 4 wt %-6 wt %, the scrap frivolous material of the weight of the scrap weight of 30 wt -50 wt %. 4. Method according to Claim 1, characterized in that the weight of the slag-forming material of the weight of the molten steel is 5 wt %-7 wt %. 5. Method according to Claim 4, characterized in that the slag forming material is: active lime, lime and magnesium-containing SiO2 acidic slag-forming material, wherein the weight of the active lime of the total weight of the slag forming material 25 wt %-32 wt %, high magnesium lime the weight of the total weight of the slag forming material 40 wt -60 wt %, containing SiO2 acidic slag-forming material the weight of the total weight of the slag forming material 25%-30%. 6. Method according to Claim 4, characterized in that the slag-forming material sub-8-15 in the hot metal to, adding the weight of each batch of the total weight of the slagging material 3 wt %-35 wt %. 7. Method according to Claim 5, characterized in that for the reactive lime, lime and magnesium-containing SiO2 of the acidic slag-forming material in each, of the 1st to the weight of the total weight of the material 40 wt %-50 wt %. 8. Method according to Claim 1, characterized in that the melt in the converter 3-14 layer, the working layer is added between the permanent layer of refractory brick. 9. Method according to Claim 8, characterized in that said refractory brick is magnesium-carbon brick.