Production of Fine Tungsten Powder by Electrolytic Reduction of Solid CaWO4 in Molten Salt

Production of Fine Tungsten Powder by Electrolytic Reduction of Solid CaWO4 in Molten Salt
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熔盐中电解还原固体CaWO4生产细钨粉

DOI:
10.1149/2.113206jes
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发表时间:
2012
影响因子:
3.9
通讯作者:
Wang, Dihua
Wang, Dihua
中科院分区:
工程技术4区
文献类型:
--
作者:
Tang, Dingding;Xiao, Wei;Yin, Huayi;Tian, Longfei;Wang, Dihua

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采用循环伏安法和恒电位/恒电压电解法研究了CaCl 2-NaCl体系中固体CaWO 4直接电化学还原制取微细钨粉的过程。系统地研究了电解时间、电解温度、电解电压等电解条件对产品质量(钨酸钙残留量)的影响。在广泛温度范围内对CaWO 4在熔体中的溶解度进行研究的基础上,提出并证实了一种前所未有的纯钨粉电解提取策略,即在CaCl 2-NaCl共晶熔盐中低温短时间电解CaWO 4(1023 K,10小时电解),然后在较高温度下在相同熔体中进行简单的洗涤过程(1123 K,1小时洗涤)。所制备的W粉的粒径小于200 nm。该方法对于从CaWO 4生产细钨粉表现出高产率和提高的能量效率。(C)2012年电化学学会。[DOI:10.1149/2.113206jes]版权所有。
Direct electrochemical reduction of solid CaWO4 to fine W powder in molten CaCl2-NaCl was studied by cyclic voltammetric measurement and potentiostatic/constant-voltage electrolysis. The effect of electrolysis conditions such as electrolysis time, temperature and voltage on the quality of the product (the residual amount of CaWO4) was systematically investigated. Based on the solubility tests of CaWO4 in the melt in a wide temperature range, an unprecedented strategy on electrolytic extraction of pure tungsten powder was proposed and confirmed, which involves low-temperature and short-duration electrolysis of solid CaWO4 in molten CaCl2-NaCl eutectic salt (1023 K, 10-hour electrolysis) followed by a simple washing process in the same melt at a higher temperature (1123 K, 1-hour washing). The particle size of the as-prepared W powder is less than 200 nm. This process exhibits a high yield and increased energy efficiency for production of fine W powder from CaWO4. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.113206jes] All rights reserved.
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