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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 .

Supercritical Water Treatment of Refractory Gold Ores

With pretreatment, gold recovery was 90%; by contrast, gold recovery was below 10% without pretreatment. Recent work at the Bureau of Mines showed some unique and potentially useful results when refractory gold ores were pretreated with supercritical water before standard leaching. This work is described below.

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Mineralogy and Pretreatment of a Refractory Gold Deposit ...

(B) Fine-grained gold, which was highly dispersed in the ore-bearing minerals, and the large amount of stratified silicate minerals were the main reasons for the poor pretreatment effect of the refractory gold ore whether it was gravity separation alone or flotation alone.

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US20090158893A1 - Microbial pre-treatment of double ...

The present application claims the benefits of U.S. Provisional Application Ser. Nos. 60/990,805, filed Nov. 28, 2007, and 61/088,928, filed Aug. 14, 2008, both entitled "Microbial Pre-Treatment of Double Refractory Gold Ores", both of which are incorporated herein by this reference in their entireties.

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Process for treating refractory gold ores by roasting ...

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 with the mineral were ...

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Refractory Gold Ore Treatment Methods

Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and .

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Review Pretreatment Process on Refractory Gold Ores with As

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 .

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

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 ...

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

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.

  • Published in: Advances in Chemical Engineering and Science · 2013Authors: Alejandro Valenzuela Valenzuela · Jesus L Valenzuela · Jose R PargaAffiliation: Universidad De Sonora[PDF]Get Price

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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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite .

ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for

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Gold mineral processing - hatch

Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory. Refractory pre-treatment processes include pressure oxidation, biological oxidation and various forms of ...

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ALTA Gold 2012 E-Doc - albionprocess

Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold

  • Published in: Advances in Chemical Engineering and Science · 2013Authors: Alejandro Valenzuela Valenzuela · Jesus L Valenzuela · Jose R PargaAffiliation: Universidad De SonoraGet Price

Assessing the Parameters for Optimum Biotransformation of ...

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery. In an on-going study, the fungus, Phanerochaete chrysosporium has been used to deactivate CM and decrease its ability to preg-rob aurocyanide. <i>P. chrysosporium</i> has been reported to ...

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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite .

ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for

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microwave pretreatment of a double refractory gold ore

refractory gold pretreatment 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.

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Pretreatment of a refractory arsenopyritic gold ore using ...

Mar 01, 2015 · Read "Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Application Note Refractory Gold Pretreatment - pH

Refractory Gold Pretreatment - pH Barben Analyzer Technology reserves the right to make technical changes or modify the contents of this document without prior notice. We reserve all rights in this document and in the subject matter and illustrations contained within.

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Sequential pretreatment of double refractory gold ore ...

Request PDF on ResearchGate | On Jul 1, 2019, Kojo T. Konadu and others published Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and ...

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Gold recovery from refractory gold concentrates by ...

Gold recovery from refractory gold concentrates by pressure oxidation pre-treatment and thiosulfate leaching Li Yu 1, Shimei Li 1, Quanjun Liu 1*, Jiushuai Deng 2,1*, Bin Luo 1, Yuanqin Liang 1, Liuchuang Zhao 1, Hao Lai 1 1 State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering,

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