低品位白云石型萤石矿浮选抑制剂作用效果对比研究

以某萤石品位37%、白云石品位51%的低品位白云石型萤石矿为研究对象，分别以腐殖酸钠、单宁、酸化水玻璃和氟硅酸钠为抑制剂，考察在不同矿浆pH值及抑制剂不同用量条件下对原矿中各种脉石矿物的抑制效果。研究发现：腐殖酸钠在酸性条件下对方解石的抑制作用加强，在碱性条件下对白云石的抑制作用减弱；单宁在酸性条件下对方解石的抑制作用减弱，碱性条件下对白云石的抑制作用加强，对方解石的抑制作用减弱；酸化水玻璃在酸性条件下对方解石和白云石的抑制作用增强，在碱性条件下抑制作用减弱；矿浆pH对氟硅酸钠抑制白云石的效果无影响，在碱性条件下对方解石的抑制作用增强；4种抑制剂中腐殖酸钠抑制作用强于氟硅酸钠，酸化水玻璃次之，单宁抑制作用最弱，氟硅酸钠对脉石矿物的选择性优于腐殖酸钠。在磨矿细度-0.074 mm占73%、碳酸钠用量500 g/t、捕收剂BK410用量400 g/t、氟硅酸钠用量1 000 g/t条件下，经1粗1扫2精开路流程，可以得到CaF2品位86.23%、回收率61.20%的萤石精矿。

Comparative Study on the Effect of Low-grade Dolomite-type Fluorite Ore Flotation Inhibitor

The low-grade dolomite-type fluorite ore with fluorite grade of 37% and dolomite grade of 51% was selected as the research object. Sodium humate， tannin， acidified sodium silicate and sodium fluorosilicate was used as inhibit to study its inhibition effects on various gangue minerals in run-of-mine ore at different pulp pH values and different inhibitor dosages. Through research: under acidic conditions， the inhibition of sodium humate to calcite was enhanced， the inhibition to dolomite is weakened under alkaline conditions. The inhibition of tannin to calcite is weakened under acidic conditions， the inhibition to dolomite is enhanced under alkaline conditions， and the inhibition to calcite is weakened. The acidified sodium silicate has an enhanced inhibition to the calcite and dolomite under acidic conditions， and the inhibition is weakened under alkaline conditions. The pulp pH has no effect on the inhibition of sodium fluorosilicate to dolomite， and the inhibition to calcite is enhanced under alkaline conditions. Among the four inhibitors， the inhibition of sodium humate was stronger than that of sodium fluorosilicate， followed by acidified sodium silicate， and the inhibition of tannin was the weakest. Sodium fluorosilicate has better selectivity to gangue minerals than sodium humate. The optimum conditions are: grinding fineness -0.074 mm accounted for 73%， sodium carbonate dosage 500 g/t， collector BK410 dosage 400 g/t and sodium fluorosilicate dosage 1 000 g/t， fluorite concentrate with CaF2 grade 86.23% and recovery 61.20% was obtained by being treated with opened-circuit process consisting of once roughing one scavenging two cleaning.