Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

论文摘要

To inhibit the dissolution of Mg2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg2+ from olivine and serpentine was temperature, followed by p H and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.

论文目录

• 1. Introduction
• 2. Experimental
•   2.1. Materials
•   2.2. pH-stat reactors
•   2.3. Experimental methods
•   2.4. Analysis methods
•   2.5. Shrinking core model
• 3. Results and discussion
•   3.1. Inhibition effect of major bioleaching factors on the dissolution of Mg2+from olivine and serpentine
•   3.2. Kinetics study of Mg2+dissolution from olivine and serpentine in the presence of leaching bacteria
•   3.3. Novel method for the bioleaching of Jinchuan high-magnesium nickel sulfide ore
•   3.4. Model for the dissolution of olivine and serpentine in a bioleaching process
• 4. Conclusions

文章来源

类型: 期刊论文

作者: Jian-zhi Sun,Jian-kang Wen,Bo-wei Chen,Biao Wu

来源: International Journal of Minerals Metallurgy and Materials 2019年09期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 矿业工程

单位: National Engineering Laboratory of Biohydrometallurgy, GRINM Group Corporation Limited

基金: financially supported by the National Natural Science Foundation of China (Nos. 51574036 and 51404033)

分类号: TD864

页码: 1069-1079

总页数: 11

文件大小: 1498K

下载量: 13