Leaching Behavior and Mechanism of Scheelite and Wolframite in Treating a Mixed Scheelite-Wolframite Concentrate by Hydrochloric Acid

被引：1
作者：
Chen, Yuanlin [1 ]
Huo, Guangsheng [1 ]
Guo, Xueyi [1 ]
Zhang, Lei [1 ]
机构：
[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China
来源：
JOURNAL OF SUSTAINABLE METALLURGY | 2023年 / 9卷 / 02期
基金：
国家重点研发计划;
关键词：
Scheelite; Wolframite; Hydrochloric acid leaching; Thermodynamics; Crystal structure; SULFURIC-ACID; TUNGSTEN; CONVERSION; KINETICS;
D O I：
10.1007/s40831-023-00696-z
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Acid leaching is considered an appropriate method for the tungsten concentrate treatment. However, it is difficult to leach wolframite efficiently. To reveal the origin of this behavior, the leaching behaviors of scheelite and wolframite in treating a mixed scheelite-wolframite concentrate by hydrochloric acid and the leaching mechanism of the two minerals were studied. The results indicated that the leaching efficiency of scheelite was much higher than that of wolframite, and wolframite was difficult to be completely leached. It was found that the preferential leaching order of tungsten minerals by hydrochloric acid is CaWO4 > MnWO4 > FeWO4. The interaction between Ca, Mn, Fe, and O in tungsten mineral crystals increases in order, indicating that the difficulty of ions being dissolved from mineral crystals is Fe2+ > Mn2+ > Ca2+. In addition, the stronger force between Fe/Mn and O makes the crystals of FeWO4 and MnWO4 form a tighter structure than that of CaWO4, which leads to the worse digestibility of wolframite than scheelite. Wolframite could be converted into scheelite by adding Ca(OH)(2) in the mechanical activation, significantly improving the leaching efficiency of wolframite. This work provides an effective countermeasure for expanding the applicability of acid leaching process.
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收藏
页码：837 / 847
页数：11
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