Sulfuric acid leaching kinetics of South African chromite
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第3期
论文作者：Qing Zhao Cheng-jun Liu Pei-yang Shi Bo Zhang Mao-fa Jiang Qing-song Zhang Ron Zevenhoven Henrik Saxén
文章页码：233 - 240
摘 要：The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a proportional relationship. A modified shrinking particle model was developed to account for the change in reactive surface area, and the model was fitted to experimental data. The resulting model was observed to describe experimental findings very well. Kinetics analysis revealed that the leaching process is controlled by a chemical reaction under the employed experimental conditions and the activation energy of the reaction is 48 kJ ·mol–1.
Qing Zhao1,2，Cheng-jun Liu1，Pei-yang Shi1，Bo Zhang1，Mao-fa Jiang1，Qing-song Zhang1，Ron Zevenhoven2，Henrik Saxén2
1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University2. Thermal and Flow Engineering Laboratory, bo Akademi University
摘 要：The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a proportional relationship. A modified shrinking particle model was developed to account for the change in reactive surface area, and the model was fitted to experimental data. The resulting model was observed to describe experimental findings very well. Kinetics analysis revealed that the leaching process is controlled by a chemical reaction under the employed experimental conditions and the activation energy of the reaction is 48 kJ ·mol–1.
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