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Study on the second stage of chalcocite leaching in column with redox potential control and its implications
Niu, Xiaopeng1,2; Ruan, Renman1; Tan, Qiaoyi1; Jia, Yan1; Sun, Heyun1
2015-05-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume155Issue:MAYPages:141-152
Abstract

High-grade natural chalcocite (Cu2S) was leached in column under controlled redox potential (Eh). To satisfy the requirements of the shrinking core model, the conditions in the column were kept as uniform as possible by adopting a short height of the middle chalcocite layer, high acid Fe-2(SO4)(3) feed and high irrigation rate. The effects of temperature, Fe3+ concentration and Eh on the second stage of chalcocite leaching were investigated. The second stage is sensitive to temperature whereas insensitive to the variations in Eh and Fe3+ concentration above a certain level. The second stage was divided into two "sub-stages" based on the inflection point at approximately 70% copper dissolution. The excellent linear relationship plotted by the mixed-kinetics indicated that the second stage is controlled by the rates of both chemical reaction and diffusion, in which the limitation of the chemical reaction rate is dominant. The second "sub-stage" (>70% dissolution) is responsible for the slow kinetics of the second stage. Mineralogical study of the residues confirmed that a S-0 product layer covered around a shrinking CuS core during the second stage. In addition, high temperature resulted in a more porous S-0 layer which remarkably influences the ion diffusion rate. A dissolution model based on the shrinking core model was proposed. Implications of the findings for heap bioleaching were discussed. (C) 2015 Elsevier B.V. All rights reserved.

KeywordChalcocite Column Leaching Controlled Redox Potential Shrinking Core Model Sulfur Product Layer
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2015.04.022
Indexed BySCI
Language英语
WOS KeywordELEMENTAL SULFUR FORMATION ; FERRIC SULFATE ; CHLORIDE SOLUTIONS ; SULFIDE MINERALS ; ZINC-SULFIDE ; ACIDIC-SOLUTIONS ; COPPER SULFIDES ; KINETICS ; DISSOLUTION ; CHALCOPYRITE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000356192200019
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Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19305
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Niu, Xiaopeng,Ruan, Renman,Tan, Qiaoyi,et al. Study on the second stage of chalcocite leaching in column with redox potential control and its implications[J]. HYDROMETALLURGY,2015,155(MAY):141-152.
APA Niu, Xiaopeng,Ruan, Renman,Tan, Qiaoyi,Jia, Yan,&Sun, Heyun.(2015).Study on the second stage of chalcocite leaching in column with redox potential control and its implications.HYDROMETALLURGY,155(MAY),141-152.
MLA Niu, Xiaopeng,et al."Study on the second stage of chalcocite leaching in column with redox potential control and its implications".HYDROMETALLURGY 155.MAY(2015):141-152.
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