Research on the Flotation Separation of Fine−grained Hematite and Quartz by Combined Cation−anion Collectors
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摘要:
考察了十二烷基磺酸钠（SDS）、十二烷基硫酸钠（SLS）、十二烷基苯磺酸钠（SDBS）以及油酸钠（NaOL）四种阴离子捕收剂分别与阳离子捕收剂十二胺（DDA）组合对浮选分离微细粒(−18 μm)赤铁矿和石英的影响。单矿物实验表明，与单一DDA相比，四种阴离子捕收剂分别与DDA组合使用能够降低赤铁矿的浮选回收率，有利于减少赤铁矿的抑制剂用量。十二胺与阴离子捕收剂组合使用时，四种阴离子捕收剂对微细粒赤铁矿和石英分离效果为：SDS>NaOL>SLS/SDBS。其中，DDA+SDS组合捕收剂在一定质量比例条件下组合使用的效果最优，在最佳浮选条件下（pH=7，捕收剂用量为20 mg/L，m（DDA）∶m（SDS）=2∶1，抑制剂用量为20 mg/L），泡沫产品中石英回收率达到91.05%，赤铁矿回收率仅为6.7%，有利于赤铁矿反浮选。人工混合矿物浮选实验结果表明，使用DDA+SDS组合捕收剂（m（DDA）∶m（SDS）=2∶1）获得精矿Fe品位为45.7%、回收率为87.0%，与单一DDA相比，分别提高了1.7、18.6百分点，有利于提高赤铁矿和石英的分离效果，DDA+SDS可作为微细粒赤铁矿和石英浮选分离的优良阴阳离子捕收剂。
Abstract:The influence of four anionic collectors, namely sodium dodecyl sulfate (SDS), sodium lauryl sulfate (SLS), sodium dodecyl benzene sulfonate (SDBS), and sodium oleate (NaOL), in combination with the cationic collector dodecylamine (DDA), on the flotation separation of fine−grained (−18 μm) hematite and quartz was investigated. Single mineral experiments indicated that each of the four anionic collectors in combination with DDA reduced the flotation recovery of hematite in the foam product compared to DDA alone, thus favoring a reduction in the depressant dosage for hematite. When DDA was combined with anionic collectors, the order of separation effectiveness for fine−grained hematite and quartz was SDS > NaOL > SLS/SDBS. Among them, the DDA+SDS combinated collectors exhibited the best performance under certain mass ratio conditions. Under the optimal flotation conditions (pH=7, collector dosage of 20 mg/L, m(DDA)∶m(SDS)=2∶1, depressant dosage of 20 mg/L), the quartz recovery in the foam product reached 91.05%, while the hematite recovery was only 6.7%, facilitating hematite reverse flotation. Artificial mixed mineral flotation experiments showed that the DDA+SDS combinated collectors (m(DDA)∶m(SDS)=2∶1) achieved a concentrate with Fe grade of 45.7% and a recovery rate of 87.0%. Compared to DDA alone, this represented an increase of 1.7 and 18.6 percentage points, respectively, contributing to an improved separation efficiency of hematite and quartz. DDA+SDS can be considered an excellent anionic−cationic collectors for the flotation separation of fine−grained hematite and quartz.
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Key words:
- hematite /
- quartz /
- dodecylamine /
- combined cation−anion collector /
- flotation
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