Production of tungsten via leaching of scheelite with sulfuric acid

被引：0
|
作者：
H. Razavizadeh
A. Ershad langroudi
机构：
[1] Iran University of Science and Technology,Department of Materials and Metallurgy Engineering
[2] Iran Polymer and Petrochemical Institute,Faculty of Processing
来源：
Mining, Metallurgy & Exploration | 2006年 / 23卷
关键词：
Tungsten; Scheelite; Leaching;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A new process for leaching scheelite ore consists of leaching low- and high-grade concentrates with H2SO4 in the presence of H3PO4 and NaCl at atmospheric pressure. The resulting tungstic acid solution is then evaporated to produce ammonium paratungstate (APT): (NH4)10H2W12O42·4H2O. To obtain the yellow oxide (WO3), the APT is heated at 600° to 700°C for one hour to evaporate ammonia and water. The reduction of tungsten trioxide with H2 can be controlled by the temperature, time and water vapor partial pressure to produce α-W.
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收藏
页码：67 / 72
页数：5
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