Leaching of chromite ore processing residue from non-calcium roasting with hydrochloric acid

被引：0
|
作者：
Ye P. [1 ]
Quan X. [1 ]
Qin X. [1 ]
Feng C. [1 ]
Li G. [1 ]
Lu C. [1 ]
Qi X. [1 ]
Jiang L. [2 ]
机构：
[1] Institute of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing
[2] Artificial Intelligence and Big Data College, Chongqing College of Electronic Engineering, Chongqing
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 11期
关键词：
COPR; Hydrochloride acid; Kinetics; Leaching; Recovery;
D O I：
10.11949/0438-1157.20190353
中图分类号：
学科分类号：
摘要：
Chromite ore precessing residue is the remaining tailings of chromite produced by chromite. It is also a secondary resource because it contains a lot of ferrum, chromium, aluminum and magnesium. In this work, a hydrometallurgy process was introduced to recover chromium, ferrum, aluminum and magnesium by using hydrochloride acid as a lixiviant and three variables were studied namely, liquid-solid ratio, leaching temperature and period. The results indicated that chromium, ferrum, aluminum and magnesium can successfully be recovered from COPR and the optimum leaching conditions were at the liquid-solid ratio of 5.6 with 110℃ and 6 h period. Simultaneously, the leaching efficiencies of chromium, ferrum, aluminum and magnesium reached 67.76%, 89.89%, 93.99% and 95.21%, respectively. A shrinking core model with the surface chemical reaction control can be used to describe the leaching kinetics of chromium, ferrum, aluminum and magnesium from COPR in the concentrated hydrochloride acid solution at 90-110℃, where the apparent activation energy are 102.31, 78.10, 66.44 and 81.66 kJ•mol-1, respectively. The analysis of particle size distribution also showed a reduction in particle size, indicating the dissolution of the solid particles. The application of Toxic Leaching Characteristic Procedure (TLCP) showed nearly no Cr6+ in the effluent, indicating that the residue will not contaminate the environment through leaching, and can be used for load bearing or backfill material. © All Right Reserved.
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页码：4428 / 4436
页数：8
相关论文
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