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首页> 中文期刊> 《中国有色金属学报（英文版）》 >通过螯合镍提高从Zn−Ni硫酸盐溶液中水解沉淀锌的选择性

通过螯合镍提高从Zn−Ni硫酸盐溶液中水解沉淀锌的选择性

         
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研究锌/镍摩尔比为20:1的锌?镍硫酸盐溶液中锌的选择性沉淀过程.将0.5 mol/L NaOH溶液滴加到含0、0.01、0.02、0.03和0.04 mol/L乙二胺四乙酸盐(EDTA)作为螯合剂的锌?镍硫酸盐溶液中.利用Visual MINTEQ软件进行沉淀途径的平衡分析.平衡分析结果表明,少量EDTA的存在可以防止镍在碱性条件下沉淀,而对锌的沉淀没有任何不利影响.鉴于此,溶液中仅存在0.03 mol/L EDTA、pH=9.0时,锌的沉淀率超过90％,沉淀产物中Zn含量约为50％,而Ni含量仅为0.11％.为了更完全地分离锌和镍,沉淀后继续搅拌120 min.沉淀产物的X射线衍射分析表明,沉淀相为Zn4(OH)6SO4·4H2O.%The selective precipitation of zinc from zinc?nickel sulfate solution with the Zn/Ni molar ratio of 20:1 was studied. Dropwise addition of 0.5 mol/L NaOH solution into the zinc?nickel sulfate solution containing 0, 0.01, 0.02, 0.03 and 0.04 mol/L ethylene diamine tetraacetate (EDTA) as a chelating agent was done. The equilibrium analysis of precipitation pathway was performed using Visual MINTEQ program. The equilibrium analysis showed that the presence of small amounts of EDTA can prevent nickel precipitation in alkaline conditions without any negative effect on zinc precipitation. On this basis, more than 90％ of zinc could be precipitated as a product with about 50％ Zn and only 0.11％ Ni at pH=9.0 merely as a result of the presence of 0.03 mol/L EDTA in the solution. The stirring time of 120 min after precipitation was found to be essential for more complete separation. The X-ray diffraction studies on the precipitate revealed that the precipitated phase was Zn4(OH)6SO4.4H2O.

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