Effect of metal ions on the flotation separation of biotite from quartz using mixed anionic/cationic collectors
Effect of metal ions on the flotation separation of biotite from quartz using mixed anionic/cationic collectors
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DOI：
10.1016/j.ces.2023.119184
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发表时间：
2023-08
影响因子：
4.7
通讯作者：
Yan Liu;Rui Xu;Ning Sun;Weipeng Sun;Ruohua Liu;Li Wang
中科院分区：
文献类型：
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作者：
Yan Liu;Rui Xu;Ning Sun;Weipeng Sun;Ruohua Liu;Li Wang
金属阳离子对硅酸盐矿物的浮选有很大影响，但作用机理尚不清楚。单矿物浮选试验结果表明，引入少量Ca ~（2+）和Mg ~（2+）后，黑云母的回收率分别提高到94.69%和96.41%，石英的回收率下降到1.21%和2.01%。人工混合矿物试验表明，Ca ~（2+）和Mg ~（2+）可使Gaudin的选择性指数分别提高11.98和11.37，而不加金属离子时的选择性指数为11.53。QCM-D测试结果表明，油酸钠（NaOL）和十二胺（DDA）可以在黑云母表面共吸附，在有或无金属离子存在的情况下，均能在黑云母表面形成刚性的DDA层。Mg 2+对NaOL在黑云母表面的吸附有促进作用，使其从分散吸附转变为刚性吸附，而对NaOL在石英表面的吸附影响不大。表面化学分析表明，金属离子在矿物表面与羧酸盐之间起吸附桥作用，从而增强了捕收剂的吸附。
Metal cations have great effects on the flotation of silicate minerals whereas the interaction mechanism is unclear. Single mineral flotation demonstrated that the recovery of biotite rose to 94.69% and 96.41%, and that of quartz declined to 1.21% and 2.01% after introducing small amounts of Ca2+and Mg2+, respectively. Artificial mixed mineral tests indicated that Ca2+and Mg2+could increase the Gaudin's selectivity index by 11.98 and 11.37, respectively, compared with 11.53 without metal ions. QCM-D measurements revealed that sodium oleate (NaOL) and dodecylamine (DDA) could co-absorb on the biotite surface, and a rigid DDA layer formed on these surfaces with/without metal ions. Moreover, the adsorption of NaOL on the biotite surface could be enhanced by Mg2+, from dissipated to rigid adsorption, while that on the quartz surface was barely influenced. Surface chemistry analysis confirmed that metal ions acted as adsorption bridges between mineral surfaces and carboxylate, thereby enhancing the adsorption of collectors.