Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第11期    总第212期    2016年11月

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文章编号:1004-0609(2016)-11-2420-06
常温常压下辉钼矿硝-硫酸浸出动力学
李 飞,张文娟,陈星宇

(中南大学 冶金与环境学院,长沙 410083)

摘 要: 研究辉钼矿硝-硫酸浸出过程的浸出动力学,考察反应温度、硝酸浓度、硫酸浓度对辉钼矿浸出速率的影响。结果表明:采用等浸出率法求得反应表观活化能为61.3 kJ/mol,辉钼矿硝-硫酸浸出过程受表面化学反应控制,浸出速率常数对温度的依赖程度高;硝酸和硫酸浓度的反应级数分别为1.4和0.54,硝酸浓度的变化严重影响浸出反应速度,提高硝酸浓度可加速矿物氧化并提高钼浸出率,而硫酸浓度的影响相对较小。

 

关键字: 辉钼矿;动力学;等浸出率法;相对变化率

Kinetics of nitric-sulfuric acid leach molybdenite at room temperature and ambient pressure
LI Fei, ZHANG Wen-juan, CHEN Xing-yu

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Kinetics of molybdenite leaching by nitric acid in sulfuric acid was studied. The effects of reaction temperature, concentration of nitric acid and sulfuric acid concentration on the leaching rate of molybdenite were investigated. The results show that, using the application of iso-leaching rate method, the apparent activation energy calculated is 61.3 kJ/mol. The reaction is chemically controlled and the leaching rate depends strongly on temperature. Also, the reaction order with respect to concentration of nitric acid and sulfuric acid are 1.4 and 0.54, respectively, the change in nitrate concentration affects the leaching reaction speed strongly, and increasing nitric acid concentration can accelerate the oxidation of the mineral and improve the leaching rate of molybdenum. But the effect of sulfuric acid concentration on leaching is not significant.

 

Key words: molybdenite; kinetics; iso-leaching rate method; relative change rate

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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