钨酸盐溶液中除钼砷锑锡等杂质的研究
来源期刊：中国有色金属学报2000年第4期
论文作者：李洪桂 孙培梅 李运姣 赵中伟 苏鹏抟 刘茂盛
文章页码：539 - 541
关键词：钨钼分离； 选择性沉淀； 钨冶金
Key words：separation of molybdenum from tungsten； selective precipitation； tungsten metallurgy
摘 要：应用合成的改进型试剂M115a， 研究了从钨酸盐溶液中选择性沉淀除钼、砷、 锡、 锑等杂质的新工艺。 小型试验证明其除杂效果比用M115有大幅度提高， 在温度为20～60℃, 沉淀剂M115a的用量为理论量的3～4倍以及保温时间为1h时，对含WO3为210g/L， Mo为0.6g/L， As， Sb， Sn各为0.2 g/L的(NH4)2WO4溶液， 最终的纯溶液中Mo和WO3的浓度比小于0.5×10-4， 同时溶液中的砷、 锡、 锑也大部分被除去， WO3回收率大于99.9%。在结晶率为90%左右时， 所得APT中上述杂质的含量全部符合GB10116-88-APTO级标准。
Abstract: According to the difference between tungsten compound and compounds of molybdenum, arsenic, antimony and tin, a novel process for selective precipitation of Mo, As, Sb and Sn from tungstate solution has been developed by means of the precipitating agent M115a, with the (NH4)2WO4 solution containing WO3, Mo, As, Sn and Sb of ρWO3, ρMo , ρ As , ρSn and ρSb were 210, 0.6, 0.15, 0.15 and 0.05 g/L respectively, more than 99% of the Mo and most of As, Sb, Sn could be removed under the condition of 50℃, 1h and the amount M115a, 3～4 times of stoichiometric amount, the Mo/WO3 in the purified solution is lower then0.5×10-4, and the recovery of WO3 is more than 99.9%. This processhas been adopted in 5 tungsten plants in our country. And industrial practice has proved that it is more effective than the traditional process.
