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acidic pretreatment of gold refractory ore processing

1Feb 1881

Pre-oxidation of high-sulfur and high-arsenic refractory ...

2009-6-1 · Since a large proportion of gold ores contain sulfide minerals, the pretreatment of refractory gold ores with ozone has interested many researchers in recent years. Ozone pretreatment was reported by Van Antwerp and Lincoln ( Van Antwerp and Lincoln, 1987 ) as a means of improving gold recovery in subsequent hypochlorite leaching.

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23Feb 1270

Refractory Gold Ore Treatment Methods

2016-7-14 · 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 …

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22Feb 786

An acidic pressure oxidation pre-treatment of refractory ...

1999-8-1 · The acidic pressure oxidation pretreatment of refractory gold concentrates from Kwekwe Roasting Plant, BSc. Eng. (Hons) Project Report, Department of Metallurgy, University of Zimbabwe. Pre-treatment of refractory gold concentrates 875, 9.

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9Feb 1387

Processing of refractory gold ores

1991-1-1 · Processing of refractory gold ores 1037 The oxidation tanks themselves are often configured in four stages with additional tanks employed in the first stage to accommodate the increased oxidation rates and aeration requirements in the initial phases of the reaction. Residence times in the tanks are often of the order of 3 to 4 days.

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24Feb 1353

An acidic pressure oxidation pre-treatment of refractory ...

Roasting is the only commercialised process in Zimbabwe for the pre-treatment of refractory gold feedstocks for the subsequent cyanidation leaching. This process results in only about 75% gold recovery and is characterised by high gold values in the residue. A pressure oxidation process in an autoclave has been evaluated as an alternative.

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16Feb 1923

(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% …

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9Feb 909

Processing of refractory gold ores

The best choice of a processing route to treat a refractory ore will in most cases be site specific, due mainly to the metallurgical and mineralogical characteristics of the ore. The successful application of these processing techniques can result in mining operations that would otherwise have been impossible.

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10Feb 1331

Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

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26Feb 532

Gold Sulphide Ore Oxidation by Alkaline Pressure

2017-10-20 · Table of ContentsExperimental ProceduresResults and DiscussionProposed Process Flowsheet The U.S. Bureau of Mines developed an alkaline oxidative pretreatment to increase the recovery of gold from refractory sulfide ores containing arsenopyrite (FeAsS) and/or pyrite (FeS2). Pretreatment of a low grade ore …

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1Feb 1814

Potential pre-treatment and processing routes for …

2021-3-11 · 2.1 Microwave pre- treatment of refractory gold ores . Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting, pressure leaching or bacterial leaching to render the gold amenable to …

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16Feb 551

Review Pretreatment Process on Refractory Gold Ores …

mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physic-chemical and electro-chemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for deal-ing with refractory gold ores are illustrated in Fig ...

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14Feb 1826

ACID OXIDATION PRETREATMENT OF REFRACTORY GOLD ORE …

An acidic pressure oxidation pre-treatment of refractory ...

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28Feb 543

Pretreatment of a refractory arsenopyritic gold ore using ...

2015-3-1 · 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. Up to 81% of the gold and 50% of the silver were recovered after ...

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