(中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 运用矿物解离分析(Mineral liberation analysis，MLA)技术，对某硫化锌矿混合浮选工艺产品进行详细的工艺矿物学分析，查明产品中闪锌矿单体解离度及连生体矿物的共生特性。结果表明：铜尾矿中闪锌矿单体解离度为85.97%，该部分闪锌矿单体可直接进行快速浮选回收而不需再磨解离。此外，锌精扫尾矿中闪锌矿单体解离度为82.09%，且大部分分布在-10 μm粒级。根据MLA结果，采用快速浮选新工艺对原工艺进行革新。闭路试验结果表明，新工艺相比原工艺锌精矿品位提高0.90%、回收率提高0.38%。闭路试验产品的MLA结果表明，新工艺可有效解决再磨过程中闪锌矿单体过磨及连生体解离不充分的问题。工业试验结果表明新工艺锌精矿品位大于48%、回收率提高0.87%，验证了快速浮选新工艺在工业应用的可行性。
关键字: MLA；硫化锌矿；工艺矿物学；解离；闪锌矿；浮选工艺
（School of Mineral Processing and Bioengineering, Central South of University, Changsha 410083, China）
Abstract:Zinc sulfide ore bulk flotation process samples were investigated for mineralogy studying by using MLA(Mineral liberation analysis) to confirm the dissemination properties of sphalerite and intergrowth minerals. The MLA results indicate that the liberation degree of sphalerite in copper tailings is 85.97%, the minerals would be recovery by quick flotation rather than regrind for dissociation. Furthermore, the liberation degree in tailings is 82.09% and the minerals are mostly distributed at ＜10 μm particle size. Based the MLA studying, the quick flotation process is proposed to reform the original bulk flotation process. The closed circuit test results illustrate that compared with original process the zinc grade and recovery rate of concentrate in new process increase by 0.90% and 0.38%, respectively. The test products are investigated by MLA indicated the new process can solve problems of sphalerite overgrinding and intergrowth minerals dissociation insufficient during regrinding. The industrial test result indicates that compared with original process the zinc grade of concentrate is greater than 48% and the recovery rate increases by 0.867%, which proves the feasibility of quick flotation in industrial application.
Key words: MLA; zinc sulfide ore; mineralogy; liberation; sphalerite; flotation process
