Extraction of vanadium from converter slag by two-step sulfuric acid leaching process

被引：121

作者：

Xiang, Junyi ^{[1
]}

Huang, Qingyun ^{[2
]}

Lv, Xuewei ^{[1
]}

Bai, Chenguang ^{[1
]}

机构：

[1] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Chongqing Univ Sci & Technol, Sch Met & Mat Engn, Chongqing 401331, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2018年 / 170卷

关键词：

Vanadium; Converter slag; Leaching; Reutilization; Cleaner production; MECHANICAL ACTIVATION; OXIDATION; KINETICS;

D O I：

10.1016/j.jclepro.2017.09.255

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Because of its potential to achieve a high recovery rate of vanadium, the mechanical activation pretreatment of vanadium-bearing converter slag followed by calcification roasting at low temperature and a two-step leaching process may be a viable alternative to the present roasting and one-step leaching process for vanadium extraction. The object of this study is to enhance the leaching efficiency of vanadium by mechanical activation and two-step leaching methods. The effects of solution acidity, liquid/solid ratio, particle size of the roasted slag, stirring speed, leaching temperature and time were investigated. The first stage leaching liquor was recycled in order to improve vanadium content in the leaching solution and reduce leaching solution consumption and wastewater discharge. Experimental results showed that approximately 81.8% vanadium was dissolved in the first stage of the leaching process with a solution pH of 2.5, and approximately 8.1% vanadium was dissolved in the second stage of the leaching process with a solution pH of 0. In the first stage, the vanadium leaching efficiency was significantly hindered by long recycle times, though this property also increased the content of vanadium in the leaching solution and greatly decreased the water consumption. In addition, mineralography and microstructures of the solid samples were studied by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) to help understand the mechanism. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：1089 / 1101

页数：13

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