Acid leaching of black shale for the extraction of vanadium

被引：61

作者：

Li, Minting ^{[1
]}

Wei, Chang ^{[1
]}

Fan, Gang ^{[1
]}

Wu, Huilin ^{[1
]}

Li, Cunxiong ^{[1
]}

Li, Xingbin ^{[1
]}

机构：

[1] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MINERAL PROCESSING | 2010年 / 95卷 / 1-4期

关键词：

Black shale; Vanadium; E-pH diagram; Sulphuric acid; Hydrofluoric acid; OIL; RECOVERY;

D O I：

10.1016/j.minpro.2010.04.002

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The feasibility of vanadium recovery from black shale was investigated using sulfuric acid and hydrofluoric acid solutions. The chemical characterization of black shale from Guizhou, China showed that vanadium mainly existed in free oxide and mica. According to E-pH diagram for V-H2O at 25 degrees C, the dissolved species of vanadium in aqueous solution mainly present in form of VO2+ and VO2+ at high potential and low pH value. The effects of leaching time, sulfuric acid concentration, hydrofluoric acid concentration, sodium hypochlorite concentration, temperature and liquid to solid ratio on the vanadium leaching were studied. The optimum parameters obtained were a reaction time of 6 h, sulfuric acid concentration of 87.5 g/L, hydrofluoric acid concentration of 15 g/L, sodium hypochlorite concentration of 1 g/L (added after a reaction time of 3 h), leaching temperature of 95 degrees C and a liquid to solid ratio of 4 mL/g. Under these conditions, up to 86% vanadium was recovered. HF has an important role in the leaching vanadium process. Compared to our previous two-step countercurrent leaching, the vanadium recovery only decreased 4% despite the leaching temperature was decreased from 150 degrees C for the previous tests to 95 degrees C for the present work. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.

引用

页码：62 / 67

页数：6

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