(中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 運(yùn)用礦物解離分析(Mineral liberation analysis，MLA)技術(shù)，對(duì)某硫化鋅礦混合浮選工藝產(chǎn)品進(jìn)行詳細(xì)的工藝礦物學(xué)分析，查明產(chǎn)品中閃鋅礦單體解離度及連生體礦物的共生特性。結(jié)果表明：銅尾礦中閃鋅礦單體解離度為85.97%，該部分閃鋅礦單體可直接進(jìn)行快速浮選回收而不需再磨解離。此外，鋅精掃尾礦中閃鋅礦單體解離度為82.09%，且大部分分布在-10 μm粒級(jí)。根據(jù)MLA結(jié)果，采用快速浮選新工藝對(duì)原工藝進(jìn)行革新。閉路試驗(yàn)結(jié)果表明，新工藝相比原工藝鋅精礦品位提高0.90%、回收率提高0.38%。閉路試驗(yàn)產(chǎn)品的MLA結(jié)果表明，新工藝可有效解決再磨過程中閃鋅礦單體過磨及連生體解離不充分的問題。工業(yè)試驗(yàn)結(jié)果表明新工藝鋅精礦品位大于48%、回收率提高0.87%，驗(yàn)證了快速浮選新工藝在工業(yè)應(yīng)用的可行性。
關(guān)鍵字: MLA；硫化鋅礦；工藝礦物學(xué)；解離；閃鋅礦；浮選工藝
（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
