Oxidative Dissolution of Sulfide Minerals in Single and Mixed Sulfide Systems under Simulated Acid and Metalliferous Drainage Conditions

2021 ◽  
Vol 55 (4) ◽  
pp. 2369-2380
Author(s):  
Gujie Qian ◽  
Rong Fan ◽  
Jianyin Huang ◽  
Allan Pring ◽  
Sarah L. Harmer ◽  
...  
Keyword(s):  
Sulfide Minerals ◽  
Oxidative Dissolution ◽  
Mixed Sulfide

New influence factor inducing difficulty in selective flotation separation of Cu-Zn mixed sulfide minerals

2015 ◽  
Vol 22 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Jiu-shuai Deng ◽  
Ying-bo Mao ◽  
Shu-ming Wen ◽  
Jian Liu ◽  
Yong-jun Xian ◽  
...  
Keyword(s):  
Influence Factor ◽  
Sulfide Minerals ◽  
Selective Flotation ◽  
Mixed Sulfide

scholarly journals Mineralogy and Genesis of the Kihabe Zn-Pb-V Prospect, Aha Hills, Northwest Botswana

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 685
Author(s):  
Nicola Mondillo ◽  
Maria Boni ◽  
Giuseppina Balassone ◽  
Nigel Forrester ◽  
Francesco Putzolu ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Sulfide Minerals ◽  
Hydrothermal Systems ◽  
The Other ◽  
Fold Belt ◽  
Direct Precipitation ◽  
Hydrothermal Processes ◽  
Alteration Halo ◽  
Two Generations ◽  
Mixed Sulfide

The Kihabe Zn-Pb-V > (Cu-Ag-Ge) prospect is located at the boundary between Namibia and Botswana (Aha Hills, Ngamiland District) in a strongly deformed Proterozoic fold belt, corresponding to the NE extension of the Namibian Damara Orogen. The Kihabe prospect contains Zn-Pb resources of 14.4 million tonnes at 2.84% zinc equivalent, Ag resources of 3.3 million ounces, and notable V-Ge amounts, still not evaluated at a resource level. The ores are represented by a mixed sulfide–nonsulfide mineralization. Sulfide minerals consist mainly of sphalerite, galena and pyrite in a metamorphic quartzwacke. Among the nonsulfide assemblage, two styles of mineralization occur in the investigated samples: A first one, characterized by hydrothermal willemite and baileychlore, and a second one consisting of supergene smithsonite, cerussite, hemimorphite, Pb-phosphates, arsenates and vanadates. Willemite is present in two generations, which postdate sulfide emplacement and may also form at their expenses. These characteristics are similar to those observed in the willemite occurrences of the nearby Otavi Mountainland, which formed through hydrothermal processes, during the final stages of the Damara Orogeny. The formation of the Kihabe willemite is likely coeval. Baileychlore is characterized by textures indicating direct precipitation from solutions and dissolution–crystallization mechanisms. Both processes are typical of hydrothermal systems, thus suggesting a hydrothermal genesis for the Kihabe Zn-chlorite as well. Baileychlore could represent an alteration halo possibly associated either with the sulfide or with willemite mineralization. The other nonsulfide minerals, smithsonite, cerussite, various Pb-phosphates and vanadates, are clearly genetically associated with late phases of supergene alteration, which overprinted both the sulfide and the willemite- and baileychlore-bearing mineralizations. Supergene alteration probably occurred in this part of Botswana from the Late Cretaceous to the Miocene.

Effect of surfactants and their mixtures on wettability of sulfide minerals by molten sulfur

2019 ◽  
Author(s):  
El'vira Kolmachikhina ◽  
◽  
Ekaterina Ryzhkova ◽  
Dar'ya Dmitrieva ◽  
◽  
...  
Keyword(s):  
Sulfide Minerals ◽  
Molten Sulfur

Abiotic reduction of 2,4-dinitrotoluene in the presence of sulfide minerals under anoxic conditions

1996 ◽  
Vol 34 (10) ◽  
pp. 25-33 ◽  
Author(s):  
Cheng Jiayang ◽  
Makram T. Suidan ◽  
Albert D. Venosa
Keyword(s):  
Electron Donor ◽  
Chemical Reduction ◽  
Sulfide Minerals ◽  
Sulfide Concentration ◽  
Magnesium Ions ◽  
High Concentration ◽  
Anoxic Conditions ◽  
High Affinity ◽  
Iron Nickel ◽  
Abiotic Reduction

Abiotic reduction of 2,4-dinitrotoluene (DNT) in the presence of sulfide minerals has been investigated under anoxic conditions at 35°C. 2,4-DNT was abiotically reduced to 4-amino-2-nitrotoluene (4-A-2-NT) and 2-amino-4-nitrotoluene (2-A-4-NT) in the presence of high concentration of sulfide (0.84 mM). No abiotic reduction of 2,4-DNT was observed in the presence of low sulfide concentration (0.42 mM). The rate and the extent of the abiotic reduction of 2,4-DNT were increased with an increase in sulfide concentration. Sulfide served as an electron donor for the reduction of 2,4-DNT. The 2-nitro group was preferentially reduced, making the 2-A-4-NT:4-A-2-NT ratio in the final products 2:1. The addition of iron, nickel, and cobalt minerals significantly enhanced the abiotic reduction. The FeS, NiS, and CoS solids formed in the serum bottles catalyzed the reduction of 2,4-DNT preferentially to 4-A-2-NT. MnS and CuS solids also catalyzed the reduction of 2,4-DNT to 4-A-2-NT, but did not change the overall reduction of 2,4-DNT. However, the presence of calcium, zinc, and magnesium minerals impeded 2,4-DNT reduction. The calcium, zinc, and magnesium ions have a high affinity to sulfide, inactivating sulfide as an electron donor for the chemical reduction of 2,4-DNT.

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