Process and kinetics of hydrochloric acid leaching of high-carbon ferrochromium

被引：0
|
作者：
Wang P. [1 ,2 ]
Zhang Y. [2 ]
Fan B. [2 ]
He D. [2 ]
Shen C. [3 ]
Zhang H. [3 ]
Zheng S. [2 ]
Zou X. [1 ]
机构：
[1] School of Metallurgy and Ecological Engineering, Beijing University of Science and Technology, Beijing
[2] Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
[3] Zhengzhou Institute of Emerging Industrial Technology, Henan, Zhengzhou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷
关键词：
chromium chloride; high-carbon ferrochrome; hydrochloric acid; kinetics; leaching;
D O I：
10.16085/j.issn.1000-6613.2023-0350
中图分类号：
学科分类号：
摘要：
The valence state of chromium in the production process of traditional chromium salt industry needs to go through the transformation of trivalent to hexavalent and then to trivalent. The high toxicity of hexavalent chromium has led to chromium becoming a key heavy metal for national prevention and control. The sustainable development of chromium salt industry urgently requires the development of new technologies to avoid hexavalent chromium generation, and acid leaching of chromium-containing raw materials is a feasible way. In this paper, we proposed a new process for the preparation of trivalent chromium salts by acid leaching using high-carbon ferrochrome alloy as raw material and hydrochloric acid as leaching agent. The leached chromium chloride and ferrous chloride could be prepared as trivalent chromium salt products, which can be used as electrolyte for ferrochrome liquid flow battery. In this paper, the effect of reaction temperature, hydrochloric acid concentration, stirring rate and reaction time on the leaching rate of chromium and iron was systematically studied based on the analysis of elemental content, physical phase composition and morphology of high-carbon ferrochrome. The results showed that the chromium leaching rate was 92% and the iron leaching rate was 95% at a reaction temperature of 100℃, a hydrochloric acid concentration of 9mol/L, a stirring rate of 250r/min and a reaction time of 6h. The kinetics of the leaching of high-carbon ferrochrome in hydrochloric acid was further investigated. The leaching process of high-carbon ferric chromium was consistent with the unreacted contraction nucleation model, and the chromium leaching process was controlled by the chemical reaction with apparent activation energy Ea=65.95kJ/mol. The iron leaching process was controlled by the chemical reaction with apparent activation energy Ea=63.85kJ/mol. © 2023 Chemical Industry Press. All rights reserved.
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页码：510 / 517
页数：7
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