A Novel Two-Stage Method of Co-Leaching of Manganese-Silver Ore and Silver-Bearing Pyrite Based on Successive Chemical and Bio Treatments: Optimization and Mechanism Study

被引：3

作者：

Sun, Jianzhi ^{[1
,2
,3
,4
]}

Shang, He ^{[1
,2
,3
,4
]}

Zhang, Qidong ^{[1
,2
,3
,4
]}

Liu, Xue ^{[1
,2
,3
,4
]}

Cai, Liulu ^{[1
,2
,3
,4
]}

Wen, Jiankang ^{[1
,2
,3
,4
]}

Yang, Han ^{[1
,2
,3
,4
]}

机构：

[1] GRINM Resources & Environm Tech Co Ltd, Beijing 101407, Peoples R China

[2] Natl Engn Res Ctr Environm Friendly Met Producing, Beijing 101407, Peoples R China

[3] China GRINM Grp Co Ltd, Beijing 100088, Peoples R China

[4] Beijing Engn Res Ctr Strateg Nonferrous Met Green, Beijing 100088, Peoples R China

来源：

METALS | 2023年 / 13卷 / 02期

关键词：

manganese-silver ore; silver-bearing pyrite; bio-hydrometallurgy technology; co-leaching; optimization; sulfur element bio-oxidation; DISSOLUTION; GOLD; CHALCOPYRITE; SEPARATION; RECOVERY; METALS; ACID; XPS; EXTRACTION; REDUCTION;

D O I：

10.3390/met13020438

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, bio-hydrometallurgy technology was employed and a novel two-stage method based on successive chemical and bio treatments was proposed to collaboratively utilize manganese-silver ore and silver-bearing pyrite. In the optimization research of the chemical leaching stage, the sensitive factors for the Mn leaching efficiency were screened by Plackett-Burman design, and central compound design was performed to settle the optimized parameters. A mixed strain of bacteria containing Sulfobacillus thermosulfidooxidans, At. caldus and Leptospirillum ferrooxidans was applied in the bioleaching stage. A conventional cyanidation process carried out with the Mn leaching residuals suggested an efficient recovery of Ag. Applying a two-stage method with the optimum conditions, the leaching efficiency of 95.3% (Mn) and 96.3% (Ag) were obtained with 284.94 kg/t silver-bearing pyrite addition and 277.44 kg/t sulfuric acid consumption with a temperature at 77.73 degrees C and stirring speed at 287.76 rpm. Mineral behaviors were investigated with XRD and SEM/EDS analysis, and it was revealed that the oxidation of sulfur is the crux in reducing the usage of reagents, and the presence of leaching bacteria enhanced the oxidation efficiently. Through optimization and mechanism study, this paper provides an opportunity to co-leach the manganese-silver ore and silver-bearing pyrite process in a more economical and environmental way.

引用

页数：20