Arsenic Precipitation from Solutions in Autoclave-Hydrometallurgical Technology of Processing Sulphide Concentrates

2020 ◽  
Vol 299 ◽  
pp. 980-985
Author(s):  
Yury V. Andreev
Keyword(s):  
Raw Materials ◽  
Promising Method ◽  
Gold Ores ◽  
Hydrometallurgical Processing ◽  
Refractory Gold Ores ◽  
Refractory Gold ◽  
Oxidative Leaching ◽  
Autoclave Oxidation ◽  
Auriferous Ores ◽  
Gold Bearing

Currently, the share of gold extracted from technologically simple gold ores is steadily decreasing, which determines the involvement in the processing of refractory gold ores containing finely disseminated gold and silver in sulfides, mainly in pyrites and arsenopyrites. Autoclave oxidation is a promising method of pretreatment of the refractory sulfide-arsenic gold-bearing raw materials before cyanidation. A serious problem of auriferous ores autoclave-hydrometallurgical processing is the removal of contained arsenic into relatively harmless and capable of being kept forms. This article shows the results of behavior of arsenic during the neutralization of solid after autoclave oxidative leaching of refractory gold-containing materials.

scholarly journals Arsenic behavior in the autoclave-hydrometallurgical processing of refractory sulfide gold-platinum-bearing products

2018 ◽  
Vol 7 (2.2) ◽  
pp. 35 ◽  
Author(s):  
G V. Petrov ◽  
S B. Fokina ◽  
A Y. Boduen ◽  
I E. Zotova ◽  
B F. Fidarov
Keyword(s):  
Raw Materials ◽  
Processing Technologies ◽  
Autoclave Leaching ◽  
Hydrometallurgical Processing ◽  
Oxidative Leaching ◽  
High Concentrations ◽  
Autoclave Oxidation ◽  
Gold Bearing ◽  
Gold Platinum

Among various types of gold-bearing ores a special place belongs to the ores, which contain gold finely-dispersed in sulphide minerals, mostly in arseno-pyrite and pyrite. Autoclave-hydrometallurgical processing technologies for such raw materials seem to be of a particular interest for study. However, autoclave oxidation of sulfide-arsenic material results in significant amounts of technological solutions with high concentrations of arsenic, iron and sulfuric acid.This article represents the studies of how arsenic behaves in autoclave oxidative leaching of a refractory sulphide gold-platinum-bearing concentrate. We studied how the composition of arsenic-bearing solutions in autoclave leaching (acidity, concentration of iron and arsenic) influences the depth of arsenic precipitation when neutralized with calcium-containing reagents, which allows converting the maximum amount of arsenic together with iron in the form of iron arsenate into a stable long-term storable precipitation.

scholarly journals Refractory gold ores and concentrates part 1: mineralogical and physico-chemical characteristics

2019 ◽  
pp. 1-13 ◽  
Author(s):  
Richmond K. Asamoah ◽  
Massimiliano Zanin ◽  
Jason Gascooke ◽  
William Skinner ◽  
Jonas Addai-Mensah
Keyword(s):  
Chemical Characteristics ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Physico Chemical ◽  
Refractory Gold

scholarly journals Analysis of the Microbial Community Associated with a Bioprocess System for Bioremediation of Thiocyanate- and Cyanide-Laden Mine Water Effluents

2015 ◽  
Vol 1130 ◽  
pp. 614-617 ◽  
Author(s):  
Robert J. Huddy ◽  
Rose Kantor ◽  
Wynand van Zyl ◽  
Robert P. van Hille ◽  
Jillian F. Banfield ◽  
...  
Keyword(s):  
Microbial Culture ◽  
Process Optimisation ◽  
Gold Extraction ◽  
Mixed Microbial Culture ◽  
Metabolic Potential ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Refractory Gold ◽  
Key Microorganisms ◽  
Activated Sludge Processes

Gold extraction by cyanidation from refractory gold ores results in the formation of thiocyanate-and cyanide-contaminated wastewater effluents that must be treated before recycle or discard. Activated sludge processes, such as ASTERTM, can be used for biodegradation of these effluent streams. The destruction of these compounds is catalyzed by a mixed microbial culture, however, very little is known about the community composition and metabolic potential of the thiocyanate-and cyanide-degrading microorganisms within the community. Here we describe our on-going attempts to better understand the key microorganisms, within the ASTERTM bioprocess, that contribute to the destruction of thiocyanate and cyanide, and how this knowledge relates to further process optimisation.

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