Coordination leaching of tungsten from scheelite concentrate with phosphorus in nitric acid

被引：18

作者：

Zhang Wen-juan ^{[1
]}

Yang Jin-hong ^{[1
]}

Zhao Zhong-wei ^{[1
,2
]}

Wang Wen-qiang ^{[1
]}

Li Jiang-tao ^{[1
,2
]}

机构：

[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China

[2] Key Lab Hunan Prov Met & Mat Proc Rare Met, Changsha 410083, Hunan, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2016年 / 23卷 / 06期

基金：

中国国家自然科学基金;

关键词：

scheelite; nitric acid; phosphoric acid; coordination leaching; KINETICS;

D O I：

10.1007/s11771-016-3181-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A hydrometallurgical process for tungsten extraction and recovery from scheelite is reported. The technology includes leaching scheelite using phosphoric acid as chelating agent in nitric acid solutions, extracting tungsten by solvent extraction and reusing leaching agent. In the leaching process, affecting factors, such as temperature, leaching time, nitric acid and dosage of phosphoric acid, were examined on recovery of tungsten. Results show that more than 97% of tungsten could be extracted under conditions of leaching temperature of 80-90 A degrees C, HNO3 concentration of 3.0-4.0 mol/L, liquild-to-soild ratio of 10:1, H3PO4 dosage of 3 stoichiometric ratio and leaching time of 3 h. Solvent extraction was then employed for the W recovery from the leachate with a organic system of 40% (v/v) N235, 30% (v/v) TBP, and 30% sulfonated kerosene. Approximately 99.93% of W was extracted and ammonium tungstate solution containing 193 g/L W was obtained with a stripping rate of 98.10% under the optimized conditions.

引用

页码：1312 / 1317

页数：6

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