高纯粉状钨酸制备工艺的研究

THE STUDY OF MANUFACTURE PROCESS OF HIGH PURITY H_2WO_4 POWDER

APT在水中的难溶性使得酸分解APT制取钨酸的化学反应成为固—液反应 ,从而妨碍了反应均匀有效地进行。在本文所述的研究中 ,通过将APT热离解为偏钨酸铵而显著地改善了原料的水溶解性 ,使得反应成为近似液—液反应。本文还着重讨论了诸如溶浆温度、酸用量、保温时间、陈化时间等工艺参数对酸分解的影响。就以杂质含量很低的APT为原料生产高纯钨酸 ,确立了相应的工艺参数。在所拟工艺条件下制得的高纯钨酸 ,纯度 >99 99% ,平均粒度 0 6 1μm。操作简便、工艺稳定、产品转化率高 。

Because ammonium paratungstate (APT) is difficult to dissolve in water,the chemical reaction of acid decomposition APT to H 2WO 4 is solid-liquid reaction and hinder the reaction uniformly and effectively carrying on. In this paper,the material's dissolvability is marktedly improved by hot-decomposition APT to ammonium metatung tate (AMT) and make the acid decomposition reaction an approximate liquid-liquid reaction. We discussed the effect of process parameters such as dissolution temperature,acid volume,holding heat times and laying times atc on acid decomposition and use low impurity content APT to produce high-purity H 2WO 4,and establish its process parameters under the drafting process condition to obtain high purity H 2WO 4 with purity>99 99% and 0.61μm average particle size.This process has unsophisticated and stable operation,high-product conversion rate and commerial production.