Abstract
The present researches and developments for ammonium paratungstate tetrahydrate production always suffer from at least one of the following problems: long production process, high-energy consumption, low tungsten crystallization ratio and serious environmental pollutions. The objective of this work is to develop a sustainable technology to directly produce ammonium paratungstate tetrahydrate. The results show that the starting material, tungsten trioxide monohydrate, can stoichiometrically react with ammonium bicarbonate or ammonium carbonate by direct transformation reaction in an airtight container under different experimental conditions. The dense-surface ammonium paratungstate tetrahydrate with the average particle size of 61.7 µm was prepared by adding solid tungsten trioxide monohydrate and 80×10−6 g/L PEG2000 into the ammonium bicarbonate solution with the liquid-to-solid mass ratio of 2 at 80 °C for 3 h. The chemical purity of the transformed ammonium paratungstate tetrahydrate meets the standards of APT·4H2O-0 grade.
摘要
针对目前四水合仲钨酸铵生产和开发过程中存在流程长、能源消耗高、钨结晶率低和环境污染 严重等问题,本文开发了一种经济、高效、可持续的技术直接转型制备四水合仲钨酸铵。结果表明, 在不同的实验条件下,原料一水合三氧化钨与碳酸氢铵或碳酸铵按生成仲钨酸铵的化学计量配比,可 在密闭容器中进行直接转化得到仲钨酸铵产品。控制反应条件为:温度80 ℃,液固质量比2:1,添 加剂PEG2000 加入量80×10−6 g/L,固相一水合三氧化钨与碳酸氢铵溶液反应3 h。制备出的四水合仲钨 酸铵产品颗粒表面致密,**均粒径为61.7 μm。转型得到的仲钨酸铵产品化学纯度符合APT·4H2O-0 级 品标准。
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Foundation item: Project(52074364) supported by the National Natural Science Foundation of China
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Zhou, Qs., **ang, Lj., Huang, Qp. et al. Direct transformation of tungsten trioxide monohydrate into ammonium paratungstate tetrahydrate in ammonium salt solutions. J. Cent. South Univ. 30, 121–131 (2023). https://doi.org/10.1007/s11771-023-5232-9
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DOI: https://doi.org/10.1007/s11771-023-5232-9