Behaviors and Mechanism of Quartz Flotation with DDA and DTAC
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摘要:
这是一篇矿物加工工程领域的论文。本文针对两种阳离子捕收剂十二胺(DDA)和十二烷基三甲基氯化铵（DTAC）对石英浮选的捕收性能做出了一系列实验研究。通过浮选实验、吸附量实验、动电位实验分别考查了两种药剂在不同浓度、不同pH值下对石英回收率、药剂吸附量、zeta电位的影响。实验表明，两种捕收剂在中性条件下均可在浓度为1×10-4 mol/L时使石英的回收率提升到接近100%，而强酸环境下两种捕收剂的捕收性能都会下降。在该浓度下，两种捕收剂均可使石英的零电点从pH值约为3左右提升到4左右；中性条件下，随着捕收剂浓度的增加，石英的zeta电位会从负变为正；碱性条件下，由于分子构造差异，两种捕收剂分子的吸附特征有所不同。
Abstract:This is an essay in the field of mineral processing engineering. This work investigates the effects of two cationic collectors, dodecyl amine (DDA) and dodecyl trimethylammonium chloride (DTAC), on flotation of quartz. Based on micro flotation tests, adsorption measurement, zeta potential measurement and infrared spectrum analysis, the author studied the recovery of quartz, the adsorption of the two kinds of collectors on quartz and the changes of zeta potential of quartz influenced by the collectors at different pH condition and concentration. The results of the experiments show that the recovery of quartz can be increased to approximately 100% by both dodecyl amine and DTAC, with 1×10-4 mol/L concentration, at neutral pH condition, however, at much lower pH condition, neither of the collectors can get a decent recovery of quartz. Additionally, in this concentration, the isoelectric point of quartz is able to be pushed to almost pH value 4 from around pH value 3 by both of the collectors; at neutral pH condition, with the concentration of either of the two collectors climbing, the zeta potential of quartz can be turned from negative to positive; at strong alkaline conditions, due to the disparities of the molecular structures, the types of the adsorptions are not exactly similar.
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Key words:
- Mineral processing engineering /
- DTAC /
- DDA /
- Quartz flotation /
- Adsorption /
- Zeta potential
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