Efficient removal of K2O and Fe2O3 impurities from bauxite tailings through active calcination combined with acid leaching

被引：6
|
作者：
Shen, Xianjiang [1 ]
Ma, Dongyang [1 ]
Guo, Min [1 ]
Zhang, Mei [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing, Peoples R China
来源：
CANADIAN METALLURGICAL QUARTERLY | 2017年 / 56卷 / 03期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
Bauxite tailings; K2O and Fe2O3 removal; active calcination; acid leaching; MULLITE MATERIALS;
D O I：
10.1080/00084433.2017.1340543
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In the present study, direct acid and active calcination-acid leaching processes were employed to remove K2O and Fe2O3 impurities from bauxite tailings. For direct acid leaching, the results indicated that Fe2O3 can be removed with the addition of 3 mol L-1 HCL, whereas K-2 O cannot be removed even when the concentration of HCl is higher than 7 mol L-1. As the bauxite tailings were calcined at 400-700 degrees C, both K2O and Fe2O3 were removed at low HCl concentration (3 mol L-1), which was ascribed to the removal of hydroxyls and increased K activity, derived from X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy.
引用
收藏
页码：294 / 300
页数：7
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