摘要
通过对大量仲钨酸铵(Ammonium Paratungstate,APT)结晶生产数据的总结,发现结晶料液(钨酸铵溶液)中氯离子浓度与APT晶体的钼含量之间存在明显的负相关关系,即氯离子具有在APT结晶过程中抑制Mo析出的作用。进一步研究还发现,对于特定组成的结晶料液,存在一对应的氯离子浓度阈值,在此阈值氯离子对料液中Mo析出的抑制作用达到最强。在此基础上,提出一种通过控制结晶料液氯离子浓度来实现APT结晶过程钨钼分离的高效、新型方法。通过这种方法,不但能够将APT的一次结晶率从原来的80%提高到96%,而且制得的APT产品具有晶体结构好,粒度均匀,纯度高(Mo含量不大于2×10-5)的优点。同时,对氯离子抑制钼析出的机理进行了探讨。
A novel method to inhibit Mo codeposition from ammonium tungstate solution during ammonium paratungstate（APT） crystallization process by control the concentration of Cl-in the solution.Based on the plentiful APT production practices,the wonderful effect of Cl-on inhibition Mo co-deposition with APT during APT crystallization process has been found out.For a special ammonium tungstate solution with given Mo concentration,there is a corresponding threshold concentration of Cl-in order to achieve high crystallization rate and low Mo content for APT production.Using this high effective method,the primary crystallization rate of the APT increases from 80% to 96% and the resultant APT is zero-grade with very low Mo concentration（≤2×10-5）.The APT products have perfect crystal morphology and homogenous particle size（40~50 μm）.A possible mechanism of Cl-inhibiting molybdenum deposition is proposed.
出处
《粉末冶金材料科学与工程》
EI
2010年第6期601-605,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家科技支撑计划资助项目(2007BAZ05B02)
关键词
APT结晶
钨酸铵溶液
氯离子浓度
钨钼分离
APT crystallization
ammonium tungstate solution
the concentration of Cl-
separate of molybdenum from tungsten
