Acid leaching of black shale for the extraction of vanadium
Acid leaching of black shale for the extraction of vanadium
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黑色页岩酸浸提钒
DOI：
10.1016/j.minpro.2010.04.002
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发表时间：
2010-07-01
影响因子：
--
通讯作者：
Li, Xingbin
中科院分区：
文献类型：
--
作者：
Li, Minting;Wei, Chang;Li, Xingbin
研究了用硫酸和氢氟酸溶液从黑色页岩中回收钒的可行性。贵州黑色页岩的化学特征表明，钒主要以游离氧化物和云母的形式存在。根据25 ℃时V-H2O的E-pH图可知，在高电位、低pH条件下，钒在水溶液中的溶解形态主要以VO 2+和VO 2+的形式存在。研究了浸出时间、硫酸浓度、氢氟酸浓度、次氯酸钠浓度、温度和液固比对钒浸出的影响。最佳工艺条件为：反应时间6 h，硫酸浓度87.5 g/L，氢氟酸浓度15 g/L，次氯酸钠浓度1 g/L（反应3 h后加入），浸出温度95 ℃，液固比4 mL/g。在此条件下，钒的回收率高达86%。HF在钒的浸出过程中起着重要的作用。与我们以前的两步逆流浸出相比，尽管浸出温度从以前试验的150 ℃降低到本工作的95 ℃，钒回收率仅降低4%。皇冠版权所有（C）2010由爱思唯尔B. V.出版保留所有权利。
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.