alkaline pressure oand idation of gold concentrates

alkaline pressure oand idation of gold concentrates

(PDF) Alkaline Pressure Oxidation of a Gold-Bearing ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

2018-6-9  The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation. Alkaline pressure oxidation at 160°C, 2413 kPa O2, and 2 M ...

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O 2 pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation.

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Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

1995-10-1  The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O2, pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation.

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OXIDATION OF REFRACTORY GOLD CONCENTRATES

2010-12-21  The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied. It involves the following aspects: the chemistry of the oxidation of pure arsenopyrite and pyrite

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Alkaline Pre-oxidation for Refractory Gold Arsenosulfide ...

A new hydrometallurgical pre-oxidation process for the refractory gold arsenosulfide concentrates under normal temperature and pressure was presented. It comprised fine grinding, intensified agitation alkali-leaching, cyanidation and adsorption. In a stirring-type pulverizing-leaching tower mill, the concentrate was ground to 37μm of 98 %, then the intensified alkaline leaching for 24 h by ...

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Study on the oxygen pressure alkaline leaching of gold ...

Cupric-ammonia catalysis for thiosulfate leaching can be substituted. • S 2 O 3 2− can be generated from S 0 oxidation during oxygen pressure alkaline leaching.. CaSiO 3 and CaSO 4 coat gold surface and hinder its extraction during the leaching.. HA additive can improve gold

More

Pressure oxidation overview - ScienceDirect

2005-1-1  Pressure hydrometallurgy of gold ores and concentrates is even younger, major developments taking place during the 1980s, barely 20 years ago. In hydrometallurgical processes for the extraction of metal values from ores or secondary materials (i.e., concentrates) there are

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Gold recovery from refractory gold concentrates by ...

2019-3-1  Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical difficult-to-treat gold deposit, located in Guizhou province in western China. It was the first application of acid pressure oxidation in China.

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high pressure o idation of refractory gold minerals

Pressure Oxidation of a Refractory Sulfide Concentrate and . Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade In sulfide ores, pyrite is the most common host mineral for gold Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms Arsenopyrite is probably the second ...

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Alkaline Pressure Oxidation of a Gold- Bearing ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O, pressure and NaOH concentration. Dissolution of gold from the leach

More

Alkaline Pressure Oxidation of a Gold-Bearing Arsenopyrite ...

The aqueous pressure oxidation of gold bearing arsenopyrite concentrates in alkaline solution was investigated as a function of O 2 pressure and NaOH concentration. Dissolution of gold from the leach residue was accomplished by standard cyanidation. Gold extraction was found to be proportional to the degree of arsenopyrite oxidation.

More

Alkaline Pre-oxidation for Refractory Gold Arsenosulfide ...

A new hydrometallurgical pre-oxidation process for the refractory gold arsenosulfide concentrates under normal temperature and pressure was presented. It comprised fine grinding, intensified agitation alkali-leaching, cyanidation and adsorption. In a stirring-type pulverizing-leaching tower mill, the concentrate was ground to 37μm of 98 %, then the intensified alkaline leaching for 24 h by ...

More

Study on the oxygen pressure alkaline leaching of gold ...

Cupric-ammonia catalysis for thiosulfate leaching can be substituted. • S 2 O 3 2− can be generated from S 0 oxidation during oxygen pressure alkaline leaching.. CaSiO 3 and CaSO 4 coat gold surface and hinder its extraction during the leaching.. HA additive can improve gold

More

Optimizing the alkaline oxidation pretreatment of a ...

2018-9-28  Whereas, gold extraction was about 49.3% by direct cyanidation. Soltani et al : Flotation–preoxidation–cyanidation methods: 1) The maximum Au recovery achieved 90.6% after 60 min of bulk flotation with 60% As recovery. 2) Pressure oxidation pretreatment of the concentrates prior to cyanidation gave high gold recoveries of over than 83%.

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Pressure oxidation overview - ScienceDirect

2005-1-1  Pressure hydrometallurgy of gold ores and concentrates is even younger, major developments taking place during the 1980s, barely 20 years ago. In hydrometallurgical processes for the extraction of metal values from ores or secondary materials (i.e., concentrates) there are

More

Atmospheric alkaline pre-oxidation of refractory sulphide ...

Atmospheric alkaline pre-oxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to ...

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high pressure o idation of refractory gold minerals

Pressure Oxidation of a Refractory Sulfide Concentrate and . Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade In sulfide ores, pyrite is the most common host mineral for gold Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms Arsenopyrite is probably the second ...

More

HYDROMETALLURGICAL PROCESSING OF GOLD-BEARING

2013-7-18  This paper outlines the application of the industrially proven technologies of low pressure and temperature Nitrogen Species Catalyzed (NSC) pressure leaching and Alkaline Sulphide Leaching (ASL) for the recovery of copper and gold from enargite. Copper can be recovered as a cathode metal or as a clean concentrate suitable for smelting.

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Direct Pressure Alkaline Leaching of Scheelite Ores and ...

2019-7-19  Flowsheet for Pressure Alkaline Leaching. The direct pressure alkaline leaching of medium- to high-grade scheelite ores can be implemented using the flowsheet proposed in Fig. 10. Grinding is suggested to be performed in two stages, using a rod mill and a ball mill. The crushed ore feeds the rod mill where a coarse grind occurs.

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A fundamental study of the alkaline sulfide leaching of

2015-12-27  been an increased interest in pressure oxidation as a means of treating gold bearing ores and concentrates. One of the problems with the partial oxidation of the sulfide host matrix to form elemental sulfur is that sulfur containing streams are difficult to treat using cyanidation. In the present paper, the alkaline sulfide

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Optimizing the alkaline oxidation pretreatment of a ...

2018-9-28  Whereas, gold extraction was about 49.3% by direct cyanidation. Soltani et al : Flotation–preoxidation–cyanidation methods: 1) The maximum Au recovery achieved 90.6% after 60 min of bulk flotation with 60% As recovery. 2) Pressure oxidation pretreatment of the concentrates prior to cyanidation gave high gold recoveries of over than 83%.

More

Study on the oxygen pressure alkaline leaching of gold ...

Cupric-ammonia catalysis for thiosulfate leaching can be substituted. • S 2 O 3 2− can be generated from S 0 oxidation during oxygen pressure alkaline leaching.. CaSiO 3 and CaSO 4 coat gold surface and hinder its extraction during the leaching.. HA additive can improve gold

More

New Technology for Recovery of Gold and Silver by

2018-9-25  technology is not used to leach the gold but only to make the cyanide ions accessible to the gold in the host mineral. 2. Extraction of gold and silver from the argentopyrite / argentite ore 2.1 Pressure oxidation / cyanidation chemistry The oxidation of gold and silver is a prerequi site for its dissolution in the alkaline cyanide lixiviant.

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high pressure o idation of refractory gold minerals

Pressure Oxidation of a Refractory Sulfide Concentrate and . Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade In sulfide ores, pyrite is the most common host mineral for gold Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms Arsenopyrite is probably the second ...

More

Atmospheric alkaline pre-oxidation of refractory sulphide ...

Atmospheric alkaline pre-oxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to ...

More

Pressure oxidation overview - ScienceDirect

2005-1-1  Pressure hydrometallurgy of gold ores and concentrates is even younger, major developments taking place during the 1980s, barely 20 years ago. In hydrometallurgical processes for the extraction of metal values from ores or secondary materials (i.e., concentrates) there are

More

Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24  gen pressure of 80 psi, 10% (w/w) sodium hypochlorite, temperature of 80˚C, at pH = 13, and a constant stirring speed of 600 rpm. These conditions allowed an approximated 60% of gold and 90% of silver extractions in 1 hr. Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1 ...

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High Pressure Acid Leach Pressure Oxidation

2016-12-20  Uranium Nickel Gold Copper Cobalt Rare earths Zinc High Pressure Acid Leach (HPAL) and Pressure Oxidation (POX) testing services provide a unique opportunity to evaluate and optimise the most economically viable process routes for the recovery of most metals such as nickel from lateritic ores and gold from refractory ores.

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Recovery of gold from refractory ores and concentrates of ...

What is claimed is: 1. A method increasing the leaching yield of gold in the cyanide treatment of refractory ores containing gold tellurides or concentrates of such ores while delivering air in an alkaline environment at atmospheric pressure comprising conducting the cyanide treatment at a temperature from 60° C. to a temperature immediately beneath the boiling point of the leaching liquid.

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