磨矿过程中添加石灰对铜锌硫化矿浮选的影响

The Influences of Adding Lime in the Grinding Process on Flotation of Copper-Zinc-Sulfide Ore

通常石灰在铜锌分离的浮选作业中主要起调节矿浆pH和抑制黄铁矿的作用,但研究发现相比不加石灰磨矿时,加石灰磨矿可增大-0.075+0.044mm粒级含量并降低-0.106+0.075mm粒级含量,同时黄铜矿的完全单体解离及富连生的百分率提高了6.43%。经SEM-EDS分析认为:添加石灰后形成的氢氧化钙微粒子进入矿石磨矿过程产生的裂隙,使得外力去除后裂隙不能闭合,当外力再次作用时矿物易于沿裂隙解离。因此石灰加入磨机提高了矿物单体解离度,相应黄铜矿浮选回收率提高了4.57个百分点,铜精矿内锌的含量降低了0.47个百分点。

Lime is normally a pH regulator of ore pulp and a good inhibitor of pyrite in the separation of copper and zinc flotation , but studies found that compared to grinding without lime, grinding with lime could increase the percentage of -0.075 ＋ 0.044 mm particle size, decrease the percentage of -0.106 ＋0.075 mm particle size, and enhanced the percentage of complete monomer dissociation and enrichment of chalcopyrite by 6.43 %. The SEM--EDS analysis showed that these calcium hydroxide particles formed by adding lime were plugged into grinding process and then the minerals generated cracks, so that after the external force removal, the cracks could not be closed and the minerals was easy to dissociate along the cracks when the external force generated. Therefore, the lime added to the mill improved the dissociation degree of mineral monomer, the flotation recovery of corresponding chalcopyrite increased by 4.57 percentage points, and the content of copper concentrate decreased by 0.47 percentage points.