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Effect of particle size on chalcocite dissolution kinetics in column leaching under controlled Eh and its implications

文献类型：期刊论文

作者Phyo, Htet Aung1,3,4,5; Jia, Yan2,3,4; Tan, Qiaoyi2,3,4; Zhao, Shenggui1; Liang, Xinxing1; Ruan, Renman2,3,4; Niu, Xiaopeng3,4
刊名PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
出版日期2020
卷号56期号:4页码:676-692
关键词particle size column leaching chalcocite shrinking core model X-ray CT
ISSN号1643-1049
DOI10.37190/ppmp/124399
英文摘要Natural high grade chalcocite samples were leached in column under controlled Eh, constant temperature and solution pH to investigate the effect of particle size on dissolution kinetics. Moreover, low grade ores of larger size fractions were leached in column using raffinate from the industrial heap as an irrigation solution to simulate the real heap conditions. The leaching rate of large particle sizes (31-200 mm) were very slow without inflection point which are normally present in the leaching of small particle sizes (0.054-31 mm). The effect of particle size was more remarkable in the dissolution of large particles than that of small particles during the first stage (<45% dissolution). However, the dissolution rate of the second stages (>45% dissolution) were not noticeably affected by the particle size. Results of kinetics analysis of leaching of small particles using shrinking core model indicated that the first stage was controlled by fluid diffusion and confirmed by the low activation energies (20.98 kJ/mol). The kinetics of second stage was controlled by chemical reaction and product layer diffusion and the later control became prominent with increasing particle size. Similarly, product layer diffusion was the rate-controlling step for the first and second stages of leaching of large particles. X-ray CT and SEM-EDS studies observed the increasing numbers of cracks and porosity and the formation of sulfur layer on the surface of the residue samples. The findings in this study provided some useful implications to optimize the heap performance and understand the leaching behavior of large particles.
WOS关键词CHLORIDE MEDIA ; SPHALERITE ; CONCENTRATE ; MECHANISMS ; MINERALOGY ; COVELLITE ; SULFIDES ; PH
资助项目National Natural Science Foundation of China[51674231] ; Key Research Program of Chinese Academy of Sciences[ZDRW-ZS-2018-1] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019A08] ; State Key Laboratory of Biochemical Engineering
WOS研究方向Chemistry ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000567298000009
出版者OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ
资助机构National Natural Science Foundation of China ; Key Research Program of Chinese Academy of Sciences ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences ; State Key Laboratory of Biochemical Engineering
源URL[http://ir.ipe.ac.cn/handle/122111/42064]  
专题中国科学院过程工程研究所
通讯作者Niu, Xiaopeng
作者单位1.Wanbao Min Ltd, Beijing 100053, Peoples R China
2.Chinese Acad Sci, State Key Lab Biochem Engn, Inst Proc Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
4.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
5.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
推荐引用方式
GB/T 7714		 Phyo, Htet Aung,Jia, Yan,Tan, Qiaoyi,et al. Effect of particle size on chalcocite dissolution kinetics in column leaching under controlled Eh and its implications[J]. PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING,2020,56(4):676-692.
APA Phyo, Htet Aung.,Jia, Yan.,Tan, Qiaoyi.,Zhao, Shenggui.,Liang, Xinxing.,...&Niu, Xiaopeng.(2020).Effect of particle size on chalcocite dissolution kinetics in column leaching under controlled Eh and its implications.PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING,56(4),676-692.
MLA Phyo, Htet Aung,et al."Effect of particle size on chalcocite dissolution kinetics in column leaching under controlled Eh and its implications".PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING 56.4(2020):676-692.

入库方式： OAI收割

来源：过程工程研究所

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