pretreatment of refractory ore prior to gold leaching

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

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

Pretreatment Process on Refractory Gold Ores with As

Therefore, pretreatment of arsenic-bearing refractory gold has an extremely important significance. 3) In recent years, researches are 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.

(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

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

Refractory Gold Ore Treatment Methods

2016-7-14  Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony

Optimizing the alkaline oxidation pretreatment of a

2018-9-28  Ultrafine grinding was proposed as a pretreatment method prior to cyanide leaching of a gold-silver ore. About 91.92% Au and 82.15% Ag were extracted after ultrafine grinding under optimum leaching conditions such as 150 kg t −1 quicklime dosage, 25% pulp density, 85 °C leach temperature, 500 g t −1 cyanide concentration and 90 h leaching

An evaluation of pretreatments to increase gold recovery

2000-1-1  Fez03 cs) + 3H20 --+ 2Fe(OH)3 (sacurated sown.) + 2FeOOH cs) + 2&O (19) 16 M. N. Lehmann et al. CONCLUSION This study has shown that in order to obtain appreciable gold recoveries from a gold ore, where the gold is located as nvisiblegold in a sulfide matrix composed mainly of arsenopyrite and pyrrhotite, an oxidative pretreatment is required

Oxidative pre-treatment in thiosulphate leaching of

Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt

Treatment of copper-rich gold ore by cyanide leaching

2015-2-1  Trans. Nonferrous Met. Soc. China 25(2015) 597−607 Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching A. D. BAS, E. KOC, E. Y. YAZICI, H. DEVECI Hydromet-B&PM Group, Division of Mineral & Coal Processing, Department of Mining Engineering, Karadeniz Technical University, Trabzon 61080, Turkey Received 28 March

(PDF) A Preliminary Study on Nitric Acid Pre

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 experiments

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

(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.

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

Optimizing the alkaline oxidation pretreatment of a

2018-9-28  Ultrafine grinding was proposed as a pretreatment method prior to cyanide leaching of a gold-silver ore. About 91.92% Au and 82.15% Ag were extracted after ultrafine grinding under optimum leaching conditions such as 150 kg t −1 quicklime dosage, 25% pulp density, 85 °C leach temperature, 500 g t −1 cyanide concentration and 90 h leaching

Effect of flotation and potassium hydroxide pretreatment

2021-10-1  In this study, potassium hydroxide leaching as pretreatment before cyanide leaching of a flotation concentrate of an antimonial refractory gold-silver ore was investigated. The ore assaying 1157 g/t Ag and 3.96 g/t Au was found to be composed of predominantly quartz, barite, kaolinite, clay, mica/chlorite, and dolomite/ankerite.

MODELING OF HIGH PRESSURE PRETREATMENT

2018-10-22  Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master's thesis. The gold ores and concentrates which cannot be easily treated by leaching process are called "refractory".

Oxidative pre-treatment in thiosulphate leaching of

Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt

Improvement of Gold Leaching from a Refractory Gold

2017-7-31  energy consumption. As a result, proper pretreatments are necessary to improve the leaching of gold from these refractory gold ores [5,6]. The pretreatment of oxidative roasting has always been one of the most extensively used methods in China attributing to its mature technique, high efficiency, energy conservation, etc. [7,8] Effective

Evaluation of Refractory Behaviour of Kaletaş (Turkey

2009-9-17  approach Pretreatment of the ore via roasting and ultrafine grinding prior to cyanide leaching was also examined to enhance the gold recoveries No significant improvement in the extraction of gold by roasting of the ore at 450 600 °C was observed despite the decrease in the cyanide consumption Two-stage cyamdation

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

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

Hypochlorite Pretreatment of a Low Grade Carbonaceous

2007-4-6  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. However, previous studies showed hypochlorite consumption is high and gold extraction is proportional to hypochlorite consumption.

Potential pre-treatment and processing routes for

2021-3-11  et al, 2018). In refractory gold ores, the gold is highly encapsulated in the sulfide matrix and pre-treatment is an important process to recover gold from the sulfide minerals. The sulfide minerals interfere with recovery of gold thus it is imperative to remove the sulfide minerals prior to leaching.

(PDF) Evaluation of Refractory Behaviour of Kaletaş

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 examined to enhance the gold recoveries No significant

280 RECENT ADVANCES IN THE TREATMENT OF

2015-8-6  heap leaching into gold metallurgy is a major innovatlon which has lowered economic cut-off ore grades to l g Au/T or less ln some cases. However it is the treatment of refractory gold ores that the greatest diversity of new developments is evident. Because of the overwhelming

MODELING OF HIGH PRESSURE PRETREATMENT

2018-10-22  Keywords: pretreatment process, pressure oxidation, refractory gold ore and concentrate, leaching, modeling Investigation of high pressure pretreatment process for gold leaching is the objective of the present master's thesis. The gold ores and concentrates which cannot be easily treated by leaching process are called "refractory".

COMPARISON OF CYANIDE AND THIOSULPHATE

2016-3-20  Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

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

© University of Science and Technology Beijing and

2021-4-27  refractory gold ore for increasing the leaching rate [5-7]. In the existing technical conditions, pretreatment of refractory gold ore is usually carried out by calcination, wet chemical, pressurized oxidation and biological oxidation, which have a number of defects 8]. For [

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