铵盐溶液中一水合三氧化钨直接转型制备仲钨酸铵
Direct transformation of tungsten trioxide monohydrate into ammonium paratungstate tetrahydrate in ammonium salt solutions
周秋生 1向丽娟 1黄庆平 1徐向明 1李小斌 1杨利群2
作者信息
- 1. School of Metallurgy and Environment,Central South University,Changsha 410083,China
- 2. School of Metallurgy and Environment,Central South University,Changsha 410083,China;Powder Metallurgy Research Institute,Central South University,Changsha 410083,China
- 折叠
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,平均粒径为61.7μm.转型得到的仲钨酸铵产品化学纯度符合APT·4H2O-0级品标准.
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 ℃ for 3 h. The chemical purity of the transformed ammonium paratungstate tetrahydrate meets the standards of APT·4H2O-0 grade.
关键词
直接转型/一水合三氧化物/仲钨酸铵/碳酸氢铵Key words
direct transformation/tungsten trioxide monohydrate/ammonium paratungstate/ammonium bicarbonate引用本文复制引用
基金项目
National Natural Science Foundation of China(52074364)
出版年
2023
NETL
NSTL
维普
万方数据