scholarly journals Oxidation of pyrite: Consequences and significance

2002 ◽  
Vol 56 (7-8) ◽  
pp. 299-316 ◽  
Author(s):  
Mile Dimitrijevic ◽  
Milan Antonijevic ◽  
Valentina Dimitrijevic
Keyword(s):  
Pyrite Oxidation ◽  
Bacterial Oxidation ◽  
Pressure Oxidation ◽  
Sulphide Minerals ◽  
Electrochemical Processes ◽  
Refractory Gold ◽  
Points Of View ◽  
Galvanic Interaction ◽  
Spontaneous Oxidation ◽  
Gold Bearing

This paper presents the most important studies on the oxidation of pyrite particularly in aqueous solutions. The consequences of pyrite oxidation was examined, as well as its importance, from both the technical-technological and environmental points of view. The oxidation of pyrite was considered in two parts. The spontaneous oxidation of pyrite in nature was described in the first part, with this part comprising pyrite oxidation in deposits depots and mines. It is explained how way natural electrochemical processes lead to the decomposition of pyrite and other minerals associated with pyrite. The oxidation of pyrite occurring during technological processes such as grinding, flotation and leaching, was shown in the second part. Particular emphasis was placed on the oxidation of pyrite during leaching. This part includes the leaching of sulphide and oxide ores, the leaching of pyrite coal and the leaching of refractory gold-bearing ores (pressure oxidation, bacterial oxidation, oxidation by means of strong oxidants and the electrolysis of pyrite suspensions). Various mechanisms of pyrite oxidation and of the galvanic interaction of pyrite with other sulphide minerals are shown.

Pressure oxidation of double refractory gold bearing sulphide Concentrates

2019 ◽  
pp. 55-66
Author(s):  
Ya. M. Shneerson ◽  
◽  
L. V. Chugaev ◽  
Keyword(s):  
Pressure Oxidation ◽  
Refractory Gold ◽  
Gold Bearing

scholarly journals Pressure oxidation of refractory gold-bearing concentrates using halogen-containing solvents and adsorbent

2015 ◽  
pp. 29-33
Author(s):  
A. V. Boldyrev ◽  
◽  
S. V. Balikov ◽  
A. V. Bogorodskiy ◽  
Yu. E. Emelyanov ◽  
...  
Keyword(s):  
Pressure Oxidation ◽  
Refractory Gold ◽  
Gold Bearing

scholarly journals Processing of refractory gold sulphide carbonbearing ores by means of their pre-oxidation with water-and-gas emulsions prepared in electrochemical and photochemical reactors

2018 ◽  
Vol 56 ◽  
pp. 03004
Author(s):  
Artur Sekisov ◽  
Paul Korpi ◽  
Anna Rasskazova ◽  
Natalia Litvinova ◽  
Tatiana Konareva
Keyword(s):  
Mineral Resources ◽  
Necessary Condition ◽  
Bacterial Oxidation ◽  
Pressure Oxidation ◽  
Gold Ores ◽  
Ultraviolet Exposure ◽  
Gold Market ◽  
Refractory Gold ◽  
Refractory Ores ◽  
Experimental Findings

In connection with the depletion of mineral resources base of gold, the engagement of refractory ores reserves in the processing becomes a necessary condition to stabilize gold market. Standard methods of processing of refractory sulphide carbon-bearing gold ores and float concentrates extracted from them include pressure oxidation and bacterial oxidation enabling the liberation of dispersive gold and oxidation of carbon having parasitical sorption with further cyanation. The alternative solution of the aforementioned problem is pre-oxidation of refractory ores with water-and-gas emulsions. Theoretical basis for active water-and-gas emulsions formation with the use of electrolytes solutions electrolysis in combination with ultraviolet exposure is stated in the article. Given method of water-and-gas emulsions preparation ensures the formation of active oxidants complex. Gold recovery into pregnant solutions up to 55.7 - 73.5% by chloride scheme was reached in laboratory experiments on samples of sulphide carbon-bearing ore, herewith 18% was recovered using cyanic solution. Based upon experimental findings, process scheme for combined oxidative preparation of sulphide carbon-bearing ore with dispersive deportment of gold was developed.

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