低品位高铁铝土矿浮选脱硅试验研究
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摘要
低品位高铁铝土矿矿石硬度较高而易过磨,造成浮选指标恶化。通过QEMSCAN分析磨矿产物各粒级组成,发现磨矿产品粗、细粒级两级分化严重且大部分三水铝石矿物在细粒级矿样中富集。考查了磨矿细度、抑制剂添加量、高分子调整剂添加量、捕收剂用量与浮选矿浆浓度等单因素对浮选的影响并确定最优浮选条件。在最优浮选条件下进行闭路试验,取得了精矿氧化铝含量54.47%、铝硅比7.02、氧化铝回收率75.96%的良好浮选指标。
Overgrinding occurs because of high hardness of low-grade high-iron bauxite,leading to deterioration of the flotation index. QEMSCAN instrument was introduced to analyze the mineral compositions of grinding products screened into a variety of size ranges,and it is found that there existed polarization between coarse-and fine-grained fractions and enrichment of gibbsite in the fine-grained fraction. Effects of single factors such as grinding fineness,depressant dosage,macromolecule regulator dosage,collector dosage,and pulp concentration on flotation were investigated to optimize processing parameters. A closed-circuit test operated at the optimal flotation conditions resulted in the concentrate containing 54.47% Al2 O3 with recovery at 75.96%,and A/S ratio at 7.02.
Overgrinding occurs because of high hardness of low-grade high-iron bauxite,leading to deterioration of the flotation index. QEMSCAN instrument was introduced to analyze the mineral compositions of grinding products screened into a variety of size ranges,and it is found that there existed polarization between coarse-and fine-grained fractions and enrichment of gibbsite in the fine-grained fraction. Effects of single factors such as grinding fineness,depressant dosage,macromolecule regulator dosage,collector dosage,and pulp concentration on flotation were investigated to optimize processing parameters. A closed-circuit test operated at the optimal flotation conditions resulted in the concentrate containing 54.47% Al2 O3 with recovery at 75.96%,and A/S ratio at 7.02.
引文
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[2]袁致涛,张松,李丽匣,等.我国高铁铝土矿铝铁分离技术现状[J].金属矿山,2013(9):100-103.
[3]许斌,李帅军.高铁铝土矿铝铁分离研究现状[J].矿业工程,2014,12(2):17-20.
[4]袁致涛,张松,李丽匣,等.我国高铁铝土矿铝铁分离技术现状[J].金属矿山,2013(9):100-103.
[5]卢毅屏.铝土矿选择性磨矿-聚团浮选脱硅研究[D].长沙:中南大学资源加工与生物工程学院,2012.
[6]谢海云,姜亚雄,叶群杰.高铝高硅铝土矿分段浮选脱硅研究[J].轻金属,2014(4):1-5.
[7]李海普,胡岳华,蒋玉仁.变性淀粉在铝硅矿物浮选分离中的作用机理[J].中国有色金属学报,2001,11(4):697-701.
[8]李海普.改性高分子药剂对铝硅矿物浮选作用机理及其结构性能研究[D].长沙:中南大学资源加工与生物工程学院,2002.
[9]张国范,冯其明,卢毅屏,等.六偏磷酸钠在铝土矿浮选中的作用[J].中南工业大学学报,2001,32(2):127-130.
[10]常自勇.选矿回水中絮凝剂对铝土矿浮选影响的研究[D].长沙:中南大学资源加工与生物工程学院,2014.