河南某难选白钨矿可选性试验研究

Beneficiability of Refractory Scheelite Ore from Henan

对河南栾川某难选白钨矿进行了矿石性质及可选性试验研究。结果表明,该透辉石石榴子石矽卡岩型钼钨矿中WO_(3)品位0.0672%,主要以白钨矿形式存在,矿石易泥化和钙质脉石含量较高不利于白钨矿回收。对钼浮选尾矿进行白钨矿浮选,在pH值调整剂碳酸钠用量1500 g/t、抑制剂水玻璃和SG用量分别为600 g/t和40 g/t、捕收剂FX-6用量400 g/t条件下,粗选段闭路试验可获得WO_(3)品位1.472%、WO_(3)回收率83.54%的白钨粗精矿;精选段闭路试验可获得WO_(3)品位31.92%、作业回收率95.71%的白钨精矿。抑制剂水玻璃和SG的组合使用有效提升了该难选白钨矿的回收效率,为后续大规模工业生产创造了有利条件。

Experimental study was conducted on the properties and beneficiability of a refractory scheelite ore from Luanchuan of Henan Province.The results show that the WO_(3) grade for this diopsidite garnet skarn-type molybdenum-tungsten ore is 0.0672%,and scheelite is the dominant tungsten minerals.This ore is prone to become sliming and also has high content of calcium-bearing gangues,which are unfavorable to scheelite recovery.With a flotation reagents scheme including regulator sodium carbonate 1500 g/t,depressor sodium silicate 600 g/t,depressor SG 40 g/t,and collector FX-6400 g/t,a closed-circuit test was performed with the tailings from molybdenum flotation for scheelite flotation.As a result,the roughing stage in the closed-circuit test produced a rough scheelite concentrate grading 1.472%WO_(3) at 83.54%recovery,and the cleaning stage produced a scheelite concentrate grading 31.92%at 95.71%recovery.By using a combination of sodium silicate and SG,the recovery efficiency of scheelite can be effectively improved,which is favorable for subsequent large-scale industrial production.