Serpentine inhibitor and application thereof in flotation of copper and nickel in copper-nickel ore

The invention discloses a serpentine inhibitor and application thereof in flotation of copper and nickel in copper-nickel ore, the serpentine inhibitor is nanocellulose, and the specific application comprises the following steps: grinding copper-nickel ore raw ore by a ball mill, then blending into ore pulp, adding the nanocellulose into the ore pulp, and stirring to obtain the serpentine inhibitor. And then ethyl xanthate and second oil are sequentially added for stirring, and copper-nickel concentrate is obtained through separation flotation operation of 1-2 times of roughing, 2-3 times of scavenging and 2-3 times of concentration. The serpentine inhibitor nanocellulose is wide in raw material source, green, environmentally friendly, free of phosphorus element, high in copper and nickel metal recovery rate, low in magnesium oxide content in concentrate and capable of achieving efficient enrichment of pentlandite and chalcopyrite in the copper-nickel ore.