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chlorination of refractory ore

Pressure chlorination of refractory gold ores - Freeport ...

1992-6-11  The slurry of refractory gold ore to be treated with chlorine in the method of this invention is prepared by slurrying ground ore with water. The ore should be ground to about 100% -70 Tyler mesh, and preferably 100% -100 Tyler mesh. Conventional dry grinding or wet grinding circuits may be utilized to achieve the desired ore grind.

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chlorination of refractory ore - bakalarzewo-parafia.pl

Wet chlorination uses chlorine (or chlorine oxidant) to dispose of Arsenic-bearing refract-tory gold ore. It is an effective method for the carbon refractory gold ore and is used in preprocess of high arsenic gold ore. Beijing General Research Institute of Mining and Metallurgy has studied a refractory gold ore bearing high arsenic in Guizhou ...

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Chlorination Leaching of Refractory Ores -

2021-10-17  Chlorination leaching of floatation concentrate could be a route for treatment of refractory ores instead of roasting, BIOB or POX - some companies are also testing fine grinding and oxygen injection using shear reactors in alkaline cyanide systems. Direct leaching of ores becomes very expensive using chlorine systems.

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US5236676A - Pressure chlorination of refractory gold ores ...

A method and apparatus are described for recovering gold from aqueous slurries of refractory gold ores containing sulfidic and/or carbonaceous matter. The method entails pretreating an ore slurry with chlorine in a multi-compartment autoclave operated at an elevated pressure. The chlorine used in this pressure chlorination pretreatment can be in either the gaseous or liquid state.

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The recovery of gold from refractory ores by the use of ...

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology ...

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Process for recovering metals from refractory ores ...

1990-2-8  Chlorination and Oxidation of Refractory Gold Ore. The following example demonstrates gold extraction from a refractory ore which only yielded 35-40% extraction during cyanide leaching. Twenty grams of refractory gold concentrate containing 94% pyrite and 6% siliceous gangue were mixed with 100 g of solid salt (NaCl) to form an ore/salt mixture.

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Research on chlorination leaching of pressure-oxidized ...

2020-6-1  This concentrate is a typical refractory ore, and its gold percent leached is 42.7% when directly chlorination-leached. To reduce the consumption of the oxidant and improve the leaching reactivity during the chlorination leaching, it pretreated the gold concentrate with acidic pressure oxidation to oxidize most of the sulfides to sulfuric acid ...

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Refractory Gold Ore Treatment Methods

2016-7-14  Refractory Gold Ore Treatment Methods. Metallurgical Content. Gold Leaching Processing of Arsenic Ore. Mispickel (Arsenopyrite: FeAsS).6. Leaching and Recovering Gold from Antimony Minerals. Stibnite (Antimony Sulphide, Sb2S2) Telluride Gold Ore Processing. Solubility of Tellurides. Gold Extraction from Carbonaceous Ore.

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gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and

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(PDF) Cyanidation of Refractory Gold Ores: A Review

In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and

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Chlorination Leaching of Refractory Ores -

2021-10-17  Chlorination leaching of floatation concentrate could be a route for treatment of refractory ores instead of roasting, BIOB or POX - some companies are also testing fine grinding and oxygen injection using shear reactors in alkaline cyanide systems. Direct leaching of ores becomes very expensive using chlorine systems.

Read More
US5236676A - Pressure chlorination of refractory gold ores ...

A method and apparatus are described for recovering gold from aqueous slurries of refractory gold ores containing sulfidic and/or carbonaceous matter. The method entails pretreating an ore slurry with chlorine in a multi-compartment autoclave operated at an elevated pressure. The chlorine used in this pressure chlorination pretreatment can be in either the gaseous or liquid state.

Read More
The recovery of gold from refractory ores by the use of ...

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology ...

Read More
Review Pretreatment Process on Refractory Gold Ores

Wet chlorination uses chlorine (or chlorine oxidant) to dispose of Arsenic-bearing refract-tory gold ore. It is an effective method for the carbon refractory gold ore and is used in preprocess of high arsenic gold ore. Beijing General Research Institute of Mining and Metallurgy has studied a refractory gold ore bearing high arsenic in Guizhou ...

Read More
Process for recovering metals from refractory ores ...

1990-2-8  Chlorination and Oxidation of Refractory Gold Ore. The following example demonstrates gold extraction from a refractory ore which only yielded 35-40% extraction during cyanide leaching. Twenty grams of refractory gold concentrate containing 94% pyrite and 6% siliceous gangue were mixed with 100 g of solid salt (NaCl) to form an ore/salt mixture.

Read More
Pretreatment Process on Refractory Gold Ores with As

Wet chlorination uses chlorine (or chlorine oxidant) to dispose of Arsenic-bearing refract-tory gold ore. It is an effective method for the carbon refractory gold ore and is used in preprocess of high arsenic gold ore. Beijing General Research Institute of Mining and Metallurgy has studied a refractory gold ore bearing high arsenic in Guizhou.

Read More
gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment to destroy all or part carbon.

Read More
Carbonaceous Gold Ore Treatment Method

2018-4-15  In mid 1975 additional chlorination capacity was installed to treat ores which required up to 40 Kg of chlorine per tonne. Estimates in 1975 showed over 1,000,000 tonnes of refractory ore reserves which required over 50 Kg of chlorine per tonne.

Read More
Refractory Gold Ore Treatment Methods

2016-7-14  Refractory Gold Ore Treatment Methods. Metallurgical Content. Gold Leaching Processing of Arsenic Ore. Mispickel (Arsenopyrite: FeAsS).6. Leaching and Recovering Gold from Antimony Minerals. Stibnite (Antimony Sulphide, Sb2S2) Telluride Gold Ore Processing. Solubility of Tellurides. Gold Extraction from Carbonaceous Ore.

Read More
(PDF) Cyanidation of Refractory Gold Ores: A Review

In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

Read More
Process for recovering metals from refractory ores ...

1990-2-8  Chlorination and Oxidation of Refractory Gold Ore. The following example demonstrates gold extraction from a refractory ore which only yielded 35-40% extraction during cyanide leaching. Twenty grams of refractory gold concentrate containing 94% pyrite and 6% siliceous gangue were mixed with 100 g of solid salt (NaCl) to form an ore/salt mixture.

Read More
NIOSHTIC-2 Publications Search - 10007514 - Refractory

An investigation undertaken by the Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores. Comparisons were made between various treatment methods in which a pulped ore is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (cicl). It was found that the organic carbon deactivating environment of

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US5104445A - Process for recovering metals from

The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert iron chloride to iron oxide. Subsequent separation steps remove the salt, gangue, and iron oxides.

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Pretreatment Process on Refractory Gold Ores with As

Wet chlorination uses chlorine (or chlorine oxidant) to dispose of Arsenic-bearing refract-tory gold ore. It is an effective method for the carbon refractory gold ore and is used in preprocess of high arsenic gold ore. Beijing General Research Institute of Mining and Metallurgy has studied a refractory gold ore bearing high arsenic in Guizhou.

Read More
Roasting and Chlorine Leaching of Gold Bearing Refractory

2016-12-19  Roasting and chlorine leaching of gold-bearing refractory concentrate: Experimental and process analysis Ida De Michelisa,⇑, Agostino Olivieria, Stefano Ubaldinib, Francesco Ferellaa, Francesca Beolchinic, Francesco Vegliòa a Department of Chemistry, Chemical Engineering and Materials, University of L’Aquila, L’Aquila 67040, Italy bInstitute of Environmental Geology and

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Testing Refractory Gold Ore - 911metallurgist

2018-5-3  Chlorination was first used at Newmont’ s Carlin mill in 1971 to treat 500 t/d of refractory ore. Ranking studies. Process Selection Process. Refractory gold ore processing offers unique challenges to the metallurgist. There is a temptation to pursue higher gold recovery regardless of overall economics.

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The reasons of gold refractory, Gold ore classification ...

2016-11-28  Refractory siliceous gold ore. ... If silver is the main economical mental, we can try to use medium preprocessing method, such as chlorination of ore or concentrate ore, soda leaching, and ...

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Carbonaceous Gold Ore Treatment Method

2018-4-15  In mid 1975 additional chlorination capacity was installed to treat ores which required up to 40 Kg of chlorine per tonne. Estimates in 1975 showed over 1,000,000 tonnes of refractory ore reserves which required over 50 Kg of chlorine per tonne.

Read More
gold refractory,ore classification,preprocessing methods

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting and chlorination pretreatment to destroy all or part carbon.

Read More
(PDF) Cyanidation of Refractory Gold Ores: A Review

In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

Read More