PAPER OPEN ACCESS Biooxidation pretreatment of low

Hence, this refractory gold ore in its processing requires pretreatment methods before cyanidation. Some conventional pretreatment methods such as the pre-aeration method by chlorination, roasting, pressure oxidation, ultrafine grinding, and flotation-intensive leaching . are . proven to be less suitable to process refractory-type gold ores

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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. 2012, pp. 165-174. L. Rusanen, J. Aromaa and O. Forsen, "Pressure

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pretreatment of refractory gold ore with

gold refractory ores microwave assisted recovery - gigsgh.org. pretreatment of refractory gold ore with microwaves. the principles of microwave heating are discussed with reference to dielectric properties .pre treatment of refractory gold ores.rowson and rice. gold ore recovery processing - .

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(PDF) Implementation of sodium hydroxide pretreatment for

The recovery of precious metals such as gold from refractory ores has received considerable attention [2][3][4][5][6]. To achieve a satisfactory recovery, a pretreatment stage is required to break

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MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY

In this study, microbial pre-treatment of double refractory gold ore (sample A) and concentrate (sample B) was investigated using a white-rot fungus, Tramestes versicolor (ATTC 20869). Pulp density, temperature, pH and retention times were the process variables considered.

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Gold mineral processing - Hatch Ltd

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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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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Effect of Pretreatment of Sulfide Refractory Concentrate

Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1. Background . Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to

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Recovery Of Gold From Refractory Ores Zimbabwe

Acidic Pretreatment Of Gold Refractory Ore Processing. Mining recovery of gold from refractory ores zimbabwe. Jan 30, 2018· An acidic pressure oxidation pre-treatment of refractory gold This process results in only about 75% gold recovery and is characterised by high gold operations and services available to . Get Price ; Gold Mineral Processing Hatch Ltd. Refractory gold ore pretreatment

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The reasons of gold refractory, Gold ore classification

Nov 28, 2016· The reasons of gold refractory, Gold ore classification, and preprocessing methods. Published on November 28, 2016 November 28, 2016 • 60 Likes • 9 Comments

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Recovery Refractory Resources - SGS

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 advantages and disadvantages of the most common pre-treatment options, and speaks to some companies that offer or use the processes A

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Improved gold and silver extraction from a refractory

Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach

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REFRACTORY GOLD - PanTerra Gold

REFRACTORY GOLD. By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach (CIL), yielding less than 80% of the contained gold.

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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 Refractory Ores Microwave Assisted Recovery

Microwave Pretreatment Of A Double Refractory Gold Ore . However there is no information published on the microwave processing of the double refractory gold ores In this paper microwave pretreatment of a double refractory gold ore was investigated as an alternative method and the results are compared to conventional roasting 3 Experimental 31 Ore sample A lowgrade sample of a double refractory

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Developments in the pretreatment of refractory gold

Developments in the pretreatment of refractory gold minerals by nitric acid D.-X. LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold

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Gold extraction - QueensMineDesignWiki

Figure 5 - Refractory Ore Pretreatment Options. In order to choose a pretreatment option for a refractory ore, the main concern is attaining a solution which succeeds in preparing the ore for cyanidation, whilst remaining economically feasible. Mill Sizing. The ore throughput rate of a mill is largely dependent on the mining production rate.

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Improvement of Gold Leaching from a Refractory Gold

Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores [].Commonly, relatively high content of detrimental impurities like S (sulfur), As

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Alkaline sulfide pretreatment of an antimonial

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 present extensively as antimonial sulfides such as andorite.

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Sulphidic refractory gold ore pre-treatment by selective

This suggests that the primary ore, as a whole, is highly refractory in nature and will therefore have to be processed using an appropriate refractory method. Often, the gold bearing ores are refractory due to the gold grains and concentration by flotation is necessary, either followed by roasting, bacterial leaching, or pressure leaching in a

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