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Acid leaching pretreatment on two-stage roasting pyrite cinder for gold extraction and co-precipitation of arsenic with iron
Wang, Yongliang1; Xiao, Li1,2; Liu, Hongxiao3; Qian, Peng1; Ye, Shufeng1; Chen, Yunfa1
2018-08-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume179Pages:192-197
Abstract

The leaching recovery of gold is low caused by the arsenic inclusion and gold encapsulation in the two-stage roasting pyrite cinder. It is necessary to pretreat the cinder to improve the recovery of gold. In this study, sulfuric acid was employed to remove arsenic and iron from the cinder, and then the arsenic was transferred to precipitates from the leaching solution by ferric ion precipitation for harmless disposal. The vast majority of the arsenic and iron were leached into the solution at 80 degrees C under atmospheric pressure. The recovery rate of gold in residue after non-cyanide extraction was greatly improved, and the gold content in residue decreased from 11.2 g/t to 3.8 g/t. The leached iron was partly precipitated by controlling the additive amount of hydrogen peroxide and pH value to precipitate the arsenic. The arsenic concentration in the solution was reduced to about 5 mg/L after 1 h of precipitation. The size of the precipitates was increased to > 100 m when the pH value was > 5.69. In addition, the precipitates had a strong adsorption capacity to absorb many other impurity ions such as ammonium. This study indicates that the removal of arsenic and iron from cinder is beneficial to increase the recovery of gold, and it is effective to remove the arsenic from the leaching solution through co-precipitation with ferric ion.

KeywordArsenic Removal Leaching Pyrite Cinder Gold Recovery Co-precipitation
DOI10.1016/j.hydromet.2018.06.008
Language英语
WOS KeywordHydrogen-peroxide ; Aqueous-solutions ; Oxidation ; Removal ; Groundwaters ; As(Iii) ; Cyanide
Funding ProjectNational Key Research and Development Program of China during the 13th Five-year Plan Period[2017YFC0703200]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Key Research and Development Program of China during the 13th Five-year Plan Period
WOS IDWOS:000441644200024
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/25591
Collection中国科学院过程工程研究所
Corresponding AuthorWang, Yongliang; Ye, Shufeng
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Inst Proc Engn, Beijing 100049, Peoples R China
3.Xinjiang Star Tower Min Co Ltd, Xinjiang 834506, Tacheng Tuoli C, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yongliang,Xiao, Li,Liu, Hongxiao,et al. Acid leaching pretreatment on two-stage roasting pyrite cinder for gold extraction and co-precipitation of arsenic with iron[J]. HYDROMETALLURGY,2018,179:192-197.
APA Wang, Yongliang,Xiao, Li,Liu, Hongxiao,Qian, Peng,Ye, Shufeng,&Chen, Yunfa.(2018).Acid leaching pretreatment on two-stage roasting pyrite cinder for gold extraction and co-precipitation of arsenic with iron.HYDROMETALLURGY,179,192-197.
MLA Wang, Yongliang,et al."Acid leaching pretreatment on two-stage roasting pyrite cinder for gold extraction and co-precipitation of arsenic with iron".HYDROMETALLURGY 179(2018):192-197.
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