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refractory ore gold and pretreatment

Improved gold and silver extraction from a refractory ...

Pretreatment of refractory ores/concentrates prior to cyanide leaching is therefore required to render the contained gold and silver readily amenable to extraction.

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Pretreatment Process on Refractory Gold Ores with As

The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in future.

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Pretreatments Applied to Refractory Gold Ores | Request PDF

The possibility of pretreatment of refractory gold ores by alkaline (lime) hot-press oxidation was analyzed by thermodynamics and the dynamic analysis of mechanism in its process was made. The ...

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Ozone: Science & Engineering Pretreatment with Ozone for ...

ozone is proposed as oxidative pretreatment for gold and silver refractory ores with the aim of modifying the pyritic matrix and thus exposing the precious metals to cyanide. MATERIAL AND METHODS The ores used in this work were the flotation tailings of two industrial operations of base metal sulfides in Mexico.

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.

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ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE …

A process for recovering gold from refractory auri- ferous iron-containing suiphidic ore comprising: feeding ground ore as an aqueous slurry to an acidic pretreatment step, treating the ground ore in the acidic pretreatment step with aqueous sulphuric acid solution to decompose car- bonate and acid consuming gangue compounds which might other- wise inhibit a subsequent pressure oxidation step, …

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GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES …

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore.

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ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

Refractory gold ore pretreatment processes continue to receive much attention. This paper compares the relative economics of treating ores by oxygen pressure oxidation, roasting and bacterial oxidation with or without preconcentration by froth flotation. Capital and operating cost estimates for each method of pretreatment were prepared and

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Process for Recovering Gold - McGill University

Refractory gold ore pretreatment operations continue to attract attention as surface oxide ores are near depletion and deep seated sulphide deposits are increasingly encountered. Refractory ores are difficult to process as are copper-gold feedstocks hence recovery from these types of gold- …

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Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015 · An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively.

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