(中南大学 冶金与环境学院，长沙 410083)
摘 要: 针对选择性沉淀法从钨酸盐溶液中除钼过程，根据已有的热力学数据，计算了伴生杂质锑的硫化平衡行为，并探讨和验证了深度除锑的可行性和途径。绘制溶液中各含锑离子随pH、溶液电势以及硫与锑的浓度比[S]/[Sb]变化的分布曲线，分析了溶液中pH、硫化剂用量以及溶液电势对锑硫化行为的影响规律，分析了选择性沉淀法的除锑能力及其影响因素，提出了深度分离锑杂质的方法，并通过实验对上述思路进行了验证。结果表明：当pH为7~10、[S]/[Sb]≥2时，溶液中99%以上含锑离子以SbS2-的形式存在；实验结果与理论预测一致，并取得了较好的效果，当硫用量和铜加入量为锑摩尔量的3倍时，除锑率达到了97%。
关键字: 硫代锑酸盐；除锑；硫化反应；热力学；选择性沉淀法；钨酸盐溶液
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Aiming at the behavior of impurity Sb in the process of Mo separation by selective precipitation method, the distribution of diagram of various antimony-containing ions were drawn according to thermodynamic calculation results. And the sulfurization of Sb under conditions of different pH, φh and [Sb]/[S] was discussed and verified. The effectiveness of selective precipitation and operating factors on antimony removing were analyzed considering the competitive coordination of S2- ions, and a method was proposed for deep removing antimony impurities. The result show that, under the conditions of pH 7-10 and [S]/[Sb]≥2, more than 99% of antimony exists as SbS2-. The above idea is verified by experiment and the results are consistent with theoretical predictions. When the dosage of sulfur and copper are 3 times, the removal rate of antimony is 97%.
Key words: sulfantimoniate; antimony removal; sulfidation reaction; thermodynamics; selective precipitation; tungstatesdution
