LEACHING OF SCHEELITE (CAWO4) UNDER QUASI-STAGNANT SOLUTION CONDITIONS

被引：0
|
作者：
DECARVALHO, RAG
NEVES, OR
机构：
来源：
HYDROMETALLURGY | 1992年 / 28卷 / 01期
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中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Leaching of low grade scheelite (CaWO4) under quasi-stagnant solution conditions was studied in alkaline (Na2CO3) and acid (HCl) media. The influence of the presence of eighteen complexing agents for tungsten was studied in both media and results presented as curves of W extraction versus time. The presence of EDTA in alkaline medium and oxalic, tartaric, malic, lactic or gluconic acid in acid medium, gives 100% of W extraction between 1 and 30 d in the apparent order: oxalic, tartaric and malic > lactic > citric > gluconic. The results obtained in the present work indicate several ways of leaching scheelite using percolation, heap- or dump-leaching techniques.
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页码：45 / 64
页数：20
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