某低品位萤石矿选矿工艺研究

Beneficiation Study on a Low Grade Fluorite Ore

某低品位萤石矿含Ca F2为25.20%,在磨矿细度-0.075 mm含量70%的条件下,采用碳酸钠为p H调整剂、常规水玻璃和酸化水玻璃为抑制剂、油酸为捕收剂,经过一次粗选—粗精矿一次精选脱泥—五次精选,可获得产率为15.93%、Ca F2品位98.27%、回收率为62.37%的高品质酸级萤石精矿产品1;中矿集中处理,经过三次精选,可以获得产率为6.20%、Ca F2品位82.73%、回收率为20.44%的冶金级萤石精矿产品2,萤石总回收率达到82.81%。精选添加酸化水玻璃,有助于提升萤石精矿的品级。

A low grade fluorite ore of which the CaF 2 grade was 25.20%, flotation tests were con-ducted under the condition of grinding fineness -0 .075 mm 70%, using sodium carbonate as pH adjusting agent , sodium silicate and acidified sodium silicate as depressant and oleic acid as collec-tor .After a roughing and a cleaning flotation , the rough concentrate was deslimed and moved to an-other five cleaning flotation .A high quality concentrate assaying 98.27%CaF2 was obtained with a yield of 15.93%and recovery of 62.37%.The middling products of flowsheet were handled together by three cleaning flotation and another concentrate product was obtained with assaying 82 .81%CaF2 ,the quality of which reached to metallurgical level .The yield was 6.20% and recovery rate was 20 .44%.This fluorite concentrate was upgraded by using acidified sodium silicate .