(中南大学 冶金科学与工程系, 长沙 410083)
摘 要: 对“选择性沉淀法从钨酸盐溶液中除钼”新工艺进行了工业试验。结果表明:对处理含WO3130~244 g/L,含钼0.535~2.55 g/L的工业钨酸铵溶液,除钼后净液中Mo/WO3达到2.00×10-5~9.12×10-5, 除钼率达97.41%~99.64%,同时还能有效除去Sn等杂质;当结晶率为95%以上时,产品APT的质量完全达到GB10116-88APT-0级标准。本技术可大大简化APT结晶母液的处理,与经典的处理结晶母液工艺相比,母液中WO3回收率提高5%以上,NH4Cl的利用率达60%~70%,三废排放量减少60%~70%。
关键字: 钨酸盐溶液; 钨钼分离; 选择性沉淀
for Mo removal from tungstate solution
(Department of Metallurgy Science and Engineering,
Central South University,Changsha 410083, P.R.China)
Abstract:The commercial scale test was conducted for impurity molybdenum removal from tungstate solution by selective precipitation method. The results show that after commercial (NH4)2WO4 solutions containing 130~244 g/L WO3 and 0.535~2.55 g/L Mo are treated, the Mo/WO3 ratio in purified solution is 2.00×10-5~9.12×10-5 and the Mo removal rate can reach 97.41%~99.64%. Impurity Sn can be removed simultaneously. The quality of product APT obtained after the evaporationcrystallization of purified (NH4)2WO4 solution can conform to GB10116-88APT-0 standard at 95.0%~98.0% crystallization rate. The treatment process of APT crystal liquor is simplified significantly using the technology. The increase of WO3 recovery rate is over 5% in comparison with classical processes and the utilization ratio of NH4Cl is 60%~70%. The practice has expressed that the technology has outstanding characteristics of good adaptability for raw materials, simple process and equipments, high metal recovery and good economics profits.
Key words: tungstate solution; separation of Mo from tungstate solution; selective precipitation