Effect of EDTA Na2-Ca on the Pelagic Activity of Smithsonite in Dodecylamine System
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摘要:
通过单矿物浮选试验，研究了不同条件下乙二胺四乙酸二钠钙（EDTA二钠钙）对十二胺（DDA）体系中菱锌矿浮游性的影响规律。结果表明：当pH值在9.2~11.1范围时，EDTA二钠钙对硫化钠活化后的菱锌矿虽无捕收性，但能够增强十二胺对菱锌矿的捕收能力；EDTA二钠钙以40%的质量比取代十二胺并用于浮选菱锌矿时，可以获得比单独使用十二胺更好的浮选效果。浮选溶液化学计算、矿物溶解试验和动电位测试的结果表明，EDTA二钠钙通过促进菱锌矿表面Zn2+的溶解来降低矿物表面的电位，从而提高菱锌矿的浮选回收率。
Abstract:The influence of ethylenediamine tetraacetic acid disodium calcium (EDTA Na2-Ca) on the flotability of smithsonite in the dodecylamine (DDA) cation flotation system was investigated by single-mineral flotation test. The results showed that EDTA Na2-Ca could not collect smithsonite activated by sodium sulfide, but could enhance the collecting ability of DDA at pH 9.2~11.1. The better flotation performance could be achieved when the mixed collector with 40% mass ratio of DDA replaced by EDTA Na2-Ca was used. The results of flotation solution chemical calculation, mineral dissolution tests, and dynamic potential tests showed that EDTA Na2-Ca significantly improved the flotation recovery of smithsonite by promoting the dissolution of Zn2+ on the smithsonite surface and reducing the potential of the mineral surface.
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表 1 菱锌矿化学成分分析结果 /%
Table 1. Chemical component analysis of smithsonite
化学成分 Zn Fe Ca Al2O3 SiO2 含量 48.50 2.56 0.52 0.36 1.96 
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表 2 菱锌矿与水的接触角
Table 2. Contact angle of smithsonite and water
矿物与作用药剂 接触角/(°) 菱锌矿纯矿物 21.37 菱锌矿+ EDTA二钠钙 22.82 菱锌矿+硫化钠+十二胺 85.42 菱锌矿+硫化钠+十二胺+ EDTA二钠钙 89.44
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