Optimization of leaching conditions for extraction of magnesium from a chromite beneficiation plant tailing predominantly containing lizardite

IF 0.5 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Bulletin of the Mineral Research and Exploration Pub Date : 2020-11-18 DOI:10.19111/bulletinofmre.827630

H. Çiftçi, B. Arslan, A. Bilen, Zeyni Arsoy, B. Ersoy

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Abstract

In this study, leaching experiments were performed for extraction of magnesium from a chromite beneficiation plant tailing predominantly containing lizardite. The X-ray fluorescence (XRF) and X-ray diffraction (XRD) analyzes showed that the tailing sample contains 39.3wt.% MgO and consist of predominantly lizardite mineral. Hydrochloric acid (HCl) and sulphuric acid (H 2 SO 4 ) were used as acids separately in leaching experiments. Acid concentration, leaching temperature, leaching time, and solid ratio were investigated as leaching parameters and optimized. Maximum magnesium extraction yield was determined to be nearly 98% for both acids under optimum leaching parameters which leaching temperature was 85 o C, solid ratio was 20wt.%, leaching time was 120 min, and acid concentrations were 6 M for HCl and 4 M for H 2 SO 4 . In addition, it was determined that the leaching residue as a solid state was mainly composed of amorphous silicate according to the XRD analysis. Dissolution rate data were explained using Jander equation. Mg dissolution process found to be diffusion controlled.

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铬铁矿选矿厂尾矿中镁的浸出条件优化

在本研究中，对从含蜥蜴石为主的铬铁矿选矿厂尾矿中提取镁进行了浸出试验。x射线荧光(XRF)和x射线衍射(XRD)分析表明，该尾矿样品含39.3wt。% MgO，主要由蜥蜴石矿物组成。采用盐酸(HCl)和硫酸(h2so4)分别作为酸进行浸出试验。考察了酸浓度、浸出温度、浸出时间、固液比等浸出参数并进行了优化。在浸出温度为85℃、固相比为20wt的最佳浸出参数下，两种酸的镁提取率均接近98%。%，浸出时间为120 min，酸浓度为HCl 6 M, h2so4 4 M。另外，通过XRD分析确定固态浸出渣主要由无定形硅酸盐组成。溶解速率数据用Jander方程解释。Mg的溶解过程受扩散控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of the Mineral Research and Exploration GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.20

自引率

20.00%

发文量

审稿时长

10 weeks

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