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pretreatment of refractory ore prior to gold leaching

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.

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(PDF) A Preliminary Study on Nitric Acid Pre-treatment of

This study was undertaken to evaluate the nitric acid leaching as a potential pre-treatment process prior to cyanidation of refractory gold/silver ores. The nitric acid pre-treatment

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Review Pretreatment Process on Refractory Gold Ores

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. Therefore, pre-

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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.

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An evaluation of pretreatments to increase gold recovery

2000-1-1  Evaluation of pretreatments to increase gold recovery from refractory ore 3 Oxidative pretreatments The pyrolysis/roasting (Pyrox) pretreatment was carried out by heating about 5Og of ~75 umre under nitrogen in a furnace at 700 for a period of 30 minutes, followed by heating in air at the same temperature for 3 hours.

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Pretreatments Applied to Refractory Gold Ores Request

It is necessary to apply a pretreatment to obtain high gold recovery (>80%) from such refractory ores by cyanide leaching. There have been many studies on the oxidation of refractory gold ores for

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Recovery of gold from sulfide refractory gold ore

Pretreatment of sulfide refractory gold ore by biooxidation in coarse-crushed ore heaps, prior to leaching the gold in a separate heap, is a promising new technology that is about to be

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Refractory Gold Ore Treatment Methods

2016-7-14  At the plant of the Consolidated Murchison Co. in the Transvaal, South Africa, where a refractory high-antimony gold ore is being treated, flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate, and during 1946, while the antimony recovery amounted to 70.6 per cent, only 62.7 per cent of the contained gold

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Ultrasound-intensified Leaching of Gold from a

The leaching ratio of gold increased with an increasing of NaCN concentra- tion from 6 to 18 kg/t. The results demonstrated that the ultrasound is a viable extractive metallurgy technique in pretreatment and leaching for the refractory gold ores.

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Developments in the pretreatment of refractory gold

2009-11-20  DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 which treats the ore for 1 to 2 h in nitric acid in the presence of air at atmospheric pressure to oxidize pyrite and arsenopyrite prior to cyanidation, claims to increase gold recoveries from 30% to 90% (Prassad et al.,

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Review Pretreatment Process on Refractory Gold Ores

refractory gold ore.8,9) Haque K E used microwave to dis-pose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%.10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in cya-nide. On the other hand the cyanide leaching of gold ore

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Recovery of gold from sulfide refractory gold ore

Pretreatment of sulfide refractory gold ore by biooxidation in coarse-crushed ore heaps, prior to leaching the gold in a separate heap, is a promising new technology that is about to be

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Pretreatments Applied to Refractory Gold Ores Request

In this study, the refractory behavior of Kaletaş ore was investigated within a diagnostic approach Pretreatment of the ore via roasting and ultrafine grinding prior to cyanide leaching was also

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Application Note Refractory Gold Pretreatment pH

2020-6-18  Refractory Gold Pretreatment pH Mining: Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes: • Roasting

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(PDF) Refractory gold-bearing ores: a review of treatment

Hypochlorite pretreatment of a refractory carbonaceous gold ore showed promise as a method for oxidizing sulfidic and carbonaceous materials prior to conventional cyanide heap leaching.

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Ultrasound-intensified Leaching of Gold from a

technique in pretreatment and leaching for the refractory gold ores. KEY WORDS: gold ore; intensified leaching; ultrasound. 1. Introduction Cyanide leaching has been applied to separate gold from ore for over 120 years. Gold ores can be classified as free milling, complex, or refractory based on gold recovery achievable by direct cyanidation.

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Determination of the leaching parameters for a refractory

2009-5-1  Leaching at pH < 10 improved gold extraction but increased the cyanide consumption by 5%. Passivation of gold occurred when the pretreatment was longer than 2 hours. A longer pretreatment reduced the cyanide consumption by 5%. Mineralogical characterization of the leach residue with no gravity pretreatment prior to leaching indicated the

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(PDF) INVESTIGATION OF THE AMENABILITY OF A COPPER

2020-12-1  Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory. Sulphuric acid pretreatment for

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012-10-4  After 24 hours, direct cyanide leaching of the initial ore resulted in only 54.8% gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide

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INVESTIGATION OF THE AMENABILITY OF A COPPER

2020-12-24  In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory. Sulphuric acid pretreatment for

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pretreatment of refractory ores prior to gold leaching

2021-8-3  pretreatment of refractory ores prior to gold leaching. ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting February 18-22, pretreatment of refractory ores prior to gold leaching 9.8 (Total: 10) 592 Votes 1184 Comments

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Application Note Refractory Gold Pretreatment pH

2020-6-18  Refractory Gold Pretreatment pH Mining: Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make leaching extraction diffi cult. These types of ores require pretreatment prior to cyanidation. Options for pretreatment include the following processes: • Roasting

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(PDF) Refractory gold-bearing ores: a review of treatment

Hypochlorite pretreatment of a refractory carbonaceous gold ore showed promise as a method for oxidizing sulfidic and carbonaceous materials prior to conventional cyanide heap leaching.

get price

Developments in the pretreatment of refractory gold

2009-11-20  DEVELOPMENTS IN THE PRETREATMENT OF REFRACTORY GOLD MINERALS BY NITRIC ACID 145 which treats the ore for 1 to 2 h in nitric acid in the presence of air at atmospheric pressure to oxidize pyrite and arsenopyrite prior to cyanidation, claims to increase gold recoveries from 30% to 90% (Prassad et al.,

get price

Determination of the leaching parameters for a refractory

2009-5-1  Leaching at pH < 10 improved gold extraction but increased the cyanide consumption by 5%. Passivation of gold occurred when the pretreatment was longer than 2 hours. A longer pretreatment reduced the cyanide consumption by 5%. Mineralogical characterization of the leach residue with no gravity pretreatment prior to leaching indicated the

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Effect of Pretreatment of Sulfide Refractory Concentrate

2013-12-24  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 recovery by direct cyanide leaching, after fine grinding of mineral indicates a refractory mineral [1]. The refrac- tory ore must be destroyed or attacked by chemical

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Effect of Oxidative Pretreatment and Lead Nitrate Addition

2019-11-1  Cyanidation is the main process in gold leaching. There are several parameters that affect gold recovery and cyanide consumption. 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% As, and 0.5% sulfur were investigated. Au recovery was increased from 79.4% to 89.4% in the presence

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012-10-4  After 24 hours, direct cyanide leaching of the initial ore resulted in only 54.8% gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide

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Optimization of the synergy between reduction leaching of

2019-12-6  A new process for extracting gold from refractory gold ore and manganese from manganese anode slime was developed by combining the oxidative pretreatment of refractory gold ore and reductive leaching of manganese anode slime. The response surface methodology was used to optimize the effects of time, temperature, and sulfuric acid concentration on the leaching efficiency of manganese. The

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INVESTIGATION OF THE AMENABILITY OF A COPPER

2020-12-24  In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory. Sulphuric acid pretreatment for

get price

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