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Effect of sodium carbonate on alkaline self-leaching of gold from flotation gold ore
Wu, Hao1,2,3; Feng, Yali1; Li, Haoran2; Li, Hailong1; Ju, Jinrong1
2021-02-01
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume256Pages:8
AbstractOxygen pressure alkaline self-leaching of gold is an environmentally friendly and smokeless leaching process. But the insoluble iron oxide generated will precipitate on the surface of parent minerals, thus reducing the oxidation reaction and gold leaching efficiency. Simultaneously, due to the different pH requirements of pyrite oxidation and gold leaching, the pH must be strictly controlled to achieve the maximum efficiency. In this work, dissolution effect and buffering effect of sodium carbonate in the gold self-leaching process were carried out. As the addition of sodium carbonate, soluble iron-carbonate complexes would be formed to remove passivation layer and expose fresh surface of pyrite, resulting in improvement pyrite oxidation rate. Meanwhile, the buffering capacity of sodium carbonate can avoid the thiosulfate decomposition and improve the concentration of thiosulfate. The maximum gold extraction efficiency of gold-bearing flotation concentrate could achieve 91.56% under the following condition: a concentration of sodium hydroxide, sodium carbonate and sodium carboxymethyl cellulose at 0.6 M, 0.3 M and 100 mg/dm(3), respectively; stirring speed at 800 rpm; temperature at 308.15 K; oxygen pressure at 0.5 Mpa; leaching time of 18 h and a liquid-solid ratio of 5:1.
KeywordNon-cyanide Gold extraction Alkaline self-leaching Oxygen pressure Sodium carbonate
DOI10.1016/j.seppur.2020.117499
Language英语
WOS KeywordAMMONIACAL THIOSULFATE ; MINERAL DISSOLUTION ; PYRITE OXIDATION ; BICARBONATE SOLUTIONS ; HEMATITE DISSOLUTION ; CONCENTRATE CALCINE ; CYANIDE ; RECOVERY ; PRETREATMENT ; ADSORPTION
Funding ProjectChina Ocean Mineral Resource RD Association[DY135B215] ; National Natural Science Foundation of China[21176242] ; National Natural Science Foundation of China[21176026]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationChina Ocean Mineral Resource RD Association ; National Natural Science Foundation of China
WOS IDWOS:000675458700003
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/49471
Collection中国科学院过程工程研究所
Corresponding AuthorFeng, Yali
Affiliation1.Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing, Peoples R China
3.Taiyuan Univ Sci & Technol, Sch Environm & Safety, Taiyuan, Peoples R China
Recommended Citation
GB/T 7714
Wu, Hao,Feng, Yali,Li, Haoran,et al. Effect of sodium carbonate on alkaline self-leaching of gold from flotation gold ore[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2021,256:8.
APA Wu, Hao,Feng, Yali,Li, Haoran,Li, Hailong,&Ju, Jinrong.(2021).Effect of sodium carbonate on alkaline self-leaching of gold from flotation gold ore.SEPARATION AND PURIFICATION TECHNOLOGY,256,8.
MLA Wu, Hao,et al."Effect of sodium carbonate on alkaline self-leaching of gold from flotation gold ore".SEPARATION AND PURIFICATION TECHNOLOGY 256(2021):8.
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