DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 Introduction The recovery of precious metals from refractory ores has

These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold. A refractory ore generally contains sulfide minerals, organic carbon, or both. Sulfide minerals are impermeable minerals that occlude gold particles, making it difficult for the leach solution to form a complex with the gold. ...

September 2012 www. .com 148 PRECIOUS METALS PROCESSING Recovering refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold recovery. Ailbhe Goodbody looks at the

Pretreatment of Refractory Ores in Gold Leaching Process, Pretreatment of Refractory Ores in Gold Leaching Process Congo XSM is a leading global manufacturer of crushing and milling equipment (Pretreatment of Refractory Ores ... Sep 19, 2012·,32;Jasa Crusher Batubara & ;

Review ISIJ International, Vol. 54 (2014), No. 3, pp Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University,

For extraction of gold from the refractory ores in which gold is surrounded by sul- fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold.

A "refractory" gold ore is an ore that is naturally resistant to recovery by standard cyanidation and carbon adsorption processes. these refractory ores require pre. Gold ore concentration plant . heap leaching flotation gravity circuit process for gold ore concentration ...

Microwave in Metallurgy ... liberate gold particles from refractory gold ores. patent for the ... use of Microwave energy in the Processing of Gold.L ... Get More Info. refractory ore gold and pretreatment 2012 …

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Pretreatment Process on Refractory Gold Ores with As Xin-yuan NAN, Xin CAI* and Jun KONG School of Electrical Engineering, Xinjiang University, 1230 Yan'an Road, Tianshan District, Urumqi, 830047 P. R. China.

refractory ore gold and pretreatment 2012 gujaratgenomics.in. pretreatment of refractory gold ore with ALTA Gold 2012 E-Doc Albion Process. estimates for different methods of pretreatment were prepared and these estimated . refractory ore gold and pretreatment 2012 crusherasia.com.

An attempt has been made to study the pretreatment of sulfidic refractory gold ore with pyrolusite. The influences of various parameters were studied to optimize the conditions. The optimum leaching conditions were pyrolusite/gold ore mass ratio of 3.0, H2SO4 concentration of 3.0 M, temperature of 100°C, particle size of 45μm, stirring speed of 200 rpm.

Refractory Ore Gold And Pretreatment 2012, Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in ....

September 2012 148 PRECIOUS METALS PROCESSING Recovering refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold [Live Chat] Recovering refractory resources - Mining Magazine

Download Citation on ResearchGate | Treatment of carbonaceous refractory gold ores | Gold ores can be categorized into two types - free milling and refractory. Free milling ores are those easy to ...

Pretreatment of Refractory Ores in Gold Leaching Process Congo XSM is a leading global manufacturer of crushing and milling equipment (Pretreatment of Refractory Ores ... Contact Supplier Treatment of refractory carbonaceous sulfide ores for gold ...

Refractory Gold Ore Treatment Methods View Larger Image ... has, in most cases, provided a satisfactory pretreatment and has been applied in several ways. Flotation removes most of the freed carbon with the concentrate, which is then roasted prior to cyanidation or shipped to a smelter. ... The leachox Process is another recently developed ...

sulphidic gold ore pretreatment in az ... refractory ore gold and pretreatment 2012 - crusherasia. Posts Related to refractory ore gold and pretreatment 2012 in . the selective and bulk flotation methods are considered as primary sulphidic refractory gold ore . » Learn More.

An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. • After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution.

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For extraction of gold from refractory ores or concentrate, in which gold is surrounded or covered by iron sulfide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to oxidize sulfides and to expose gold to the leaching solution.

Pretreatment with Ozone for Gold and Silver Recovery from Refractory Ores F. Nava-Alonso a; E. Elorza-Rodríguez; ... In this work ozonization was studied as pretreatment for two Mexican refractory ores in order to increase the gold and silver extraction. Two methods for contacting ozone

This paper presents the alkaline sulfide pretreatment of an antimonial refractory gold and silver ore. In the ore, gold occurs mainly as gold-silver alloys and as associated with quartz and framboidal pyrite grains, and, to a small extent, as the inclusions within antimonial sulfides. Silver is ...

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The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals. This process was conducted and evaluated under cyanide and oxygen ...

Refractory ores, such as ores with gold disseminated in pyrite or arsenopyrite, are not amenable to direct cyanidation. ... The investigation of alkaline pressure pretreatment was continued by the Bureau for ores more typically found in the United states today. This paper presents the results of an investigation to determine the viability of ...

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Microwave pretreatment of a double refractory gold ore ... Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching.

Request PDF on ResearchGate | Implementation of sodium hydroxide pretreatment for refractory antimonial gold and silver ores | Alkaline pretreatment of a refractory gold–silver ore containing ...

Microwave Pretreatment Of A Refractory Gold. the use of microwave in refractory ore benification Pretreatment Process on Refractory Gold Ores with As Microwave roasting is a new pretreatment …

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