N,N-二羟乙基十二胺对赤铁矿和石英的浮选性能研究

以赤铁矿反浮选脱硅体系为载体,通过单矿物浮选试验和人工混合矿分选试验考察了N,N-二羟乙基十二胺对赤铁矿和石英浮选行为的影响。单矿物浮选试验结果表明,N,N-二羟乙基十二胺对石英具有很好的捕收能力,在矿浆自然p H、N,N-二羟乙基十二胺用量大于13.33 mg/L时,石英回收率保持在90%以上;N,N-二羟乙基十二胺对赤铁矿的捕收能力较弱,在考察的捕收剂用量范围内,赤铁矿回收率不超过70%。人工混合矿分选结果表明,在矿浆自然p H、N,N-二羟乙基十二胺用量为20 mg/L、淀粉用量为3.33 mg/L条件下,可获得精矿铁回收率为86.86%、铁品位为65.28%的分选指标;N,N-二羟乙基十二胺可应用于石英和赤铁矿矿物的浮选分离。动电位测试结果表明,N,N-二羟乙基十二胺在石英表面发生了静电吸附。

Flotation Performances of Hematite and Quartz Using Bis (2-hydroxylethyl) Dodecylamine as Collector

Flotation capabilities of bis (2-hydroxylethyl) dodecylamine to hematite and quartz were investigated in labo-ratory via single mineral flotation and manual mixed mineral separation. Single mineral flotation test results indicate that bis (2-hydroxylethyl) dodecylamine has better collectability to quartz,with natural slurry pH,collector concentration is above 13. 33 mg/L,the recovery of quartz is more than 90%,while the hematite has relatively lower recovery,thus weak floatability to hema-tite,and the maximum flotation recovery of hematite is no more than 70%. Separation results of manual mixed mineral indicate that bis (2-hydroxylethyl) dodecylamine can separate hematite and quartz mixtures with the existence of starch. And the opti-mized separation results with 86. 86% iron recovery and 65. 28% iron grade in concentrate is achieved with natural slurry pH, bis (2-hydroxylethyl) dodecylamine concentration is 20 mg/L,starch concentration is 3. 33 mg/L. Zeta potential experimant results indicate that collecting performance of bis (2-hydroxylethyl) dodecylamine to quartz is achieved mainly because elec-trostatic adsorption between collector and quartz surface.