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Optimization Process of the Refractory Gold Ore Extraction ...

Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction from …

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Column bio-oxidation of low-grade refractory gold ore ...

One of the refractory gold ores is the sulfide gold ore, which is characterized by the fact that gold is mainly encapsulated by arsenopyrite and pyrite in the form of microscopic or sub-microscopic, resulting in the gold cannot effectively contact with the leaching agent (Qin et al., 2021, Wang et al., 2020a, Wang et al., 2020b).

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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 Oktay Celep, İbrahim Alp⁎, Hacı Deveci Department of Mining Engineering ...

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Extraction method for refractory precious metal ore

Cyanic extraction of precious metal from comminuted, refractory precious metal ore as well as refractory precious metal concentrates and tailings from such ore is effected with rapidity and high yield by agitationally treating the refractory material with an aerated, alkaline solution containing a high concentration of water soluble cyanide and a low concentration of chemical …

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Refractory Gold Technology

to Homestake Mining Company, leading to the first commercial application of pressure oxidation for refractory gold ore treatment, at the McLaughlin Gold Complex in California, commissioned in 1985. Refractory Gold Technology Sherritt's Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks.

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(PDF) New Chloride Leaching Process for Gold Extraction ...

New Chloride Leaching Process for Gold Extraction from Refractory Ores. S. Chero-Osorio. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 35 Full PDFs related to this paper. Read Paper. New Chloride Leaching Process for Gold Extraction from Refractory Ores.

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CN102534195B - Gold extraction process method for ...

A gold extraction process method for refractory gold ore uses continuous operations of sulfation roasting, cinder secondary low-temperature acidic roasting, middle-temperature sulfation decomposition and cyaniding gold extraction. Sulfuric acid produced in a general sulfation roasting process is utilized, cinder is secondarily roasted and oxidized in low temperature and …

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Silver extraction from a refractory type ore by thiourea ...

In this work, the extraction of silver from the refractory type Gümüşköy-Pasa (Turkey) ores by thiourea leaching is studied. Optimum leaching conditio…

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How to extract uranium from refractory ores (Journal ...

Authors: Caldas, A Publication Date: Tue Jul 01 00:00:00 EDT 1975 Research Org.: Federal Univ., Rio de Janeiro OSTI Identifier: 4206602 NSA Number:

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International Journal of Mining Science and Technology

Gold ores Refractory ores Leaching Chlorine abstract This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process considers a pre-treatment of refractory materials by low temperature oxidation carried out with low oxygen concentration. The oxidized material is treated by leaching with brine. After gold ...

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Refractory Gold Ore Treatment Methods

Gold Extraction from Carbonaceous Ore List Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, …

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Refractory gold ores: Challenges and opportunities for a ...

it is important to note that the additional processing steps required for treating refractory ores generate additional costs compared with conventional plants; however, the reserve grade for these ores is on average 86 percent higher than those of nonrefractory-type deposits (2.25 grams per metric ton on average, versus 1.21 grams per metric ton …

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How to Extract Silver from Refractory Ores

The refractory minerals in Candelaria and Round Mountain silver ore were identified, and their effects upon silver extraction were demonstrated. The data indicated that when silver is mineralogically associated with iron and …

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Leaching of a Refractory Gold Ore Sample from the Central ...

A cyanidation study was conducted on a mild refractory gold ore sample from the Central zone of Clarence Stream Property, owned by Freewest Resources Canada, to develop a leaching strategy to extract gold. Gold, at a grade of 8.00 g/t, is present as native gold, electrum and aurostibite. The ore also contains 2.8 per cent pyrrhotite, together with several antimony …

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Bioprocessing of refractory oxide ores by bioreduction ...

Zinc and copper are solubilized by metabolic end products such as organic acids. Bioreductive leaching of oxide ores was more successful than chemical leaching. A 0.1% cyanide bottle roll on an Arizona manganiferous silver ore resulted in 13.7% silver extraction. Bioreductive leaching extracted 86% of the silver into the growth medium.

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Extraction of silver from a refractory silver ore by sono ...

In this study, effect of ultrasound on silver extraction from a refractory silver ore containing both native silver and various silver sulphide minerals was investigated. Main effects and interaction effects of pulp density, ultrasonic frequency, cyanide concentration, air flow rate and agitation sp …

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Comparative Study of Gold Extraction from Refractory ...

Sonora, Mexico has several deposits considered rich in precious metals such as gold, silver, and copper. Several mining projects in the state have found unique refractory ores that are not technically or economically treatable under conventional extraction processes [1,2,3].Researchers have sought economical and efficient solutions to these problems.

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US5104445A - Process for recovering metals from …

The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert iron chloride to iron oxide. Subsequent separation steps remove the salt, gangue, and iron oxides.

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Minerals | Free Full-Text | Specific Refractory Gold ...

Despite numerous reported studies on improved gold extraction (by cyanide leaching) from complex low grade ores [9,10,11,12,13,14,15,16], there is still a lack of fundamental knowledge and understanding on the interplay between refractory ore-specific primary and secondary mineral phases, solution chemistry, and the particle-solution ...

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Extraction of gold from refractory gold ore using bromate ...

In this study, an efficient and low-toxicity method for extracting gold from a high-sulfur and high-arsenic carbonaceous refractory gold ore was developed using a solution of bromate and ferric chloride.

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US4421724A - Extraction method for refractory precious ...

Cyanic extraction of precious metal from comminuted, refractory precious metal ore as well as refractory precious metal concentrates and tailings from such ore is effected with rapidity and high yield by agitationally treating the refractory material with an aerated, alkaline solution containing a high concentration of water soluble cyanide and a low concentration of chemical …

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Evaluating Process Options for Treating Some Refractory Ores

A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. Demonstration of economic treatment options allows gold companies

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John T. Boyd Company – Refractory Ore Specialist ...

Refractory Ores. It is well known throughout the mining industry that direct leaching gold deposits are becoming far less common and that the percentage of gold produced from refractory ore deposits will continue to increase for the foreseeable future.

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EXTRACTION METHODS FROM REFRACTORY ORES

extraction methods from refractory ores Nov 10, 2017 A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and ...

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Method and Apparatus for the Recovery of Refractory ...

A method for extraction a metal from a mineral ore including a refractory ore contained in a metal. The method includes concentration of refractory ore followed by micronization of the concentrate until gold is liberated by the extraction solution and mixing of micronized concentrate with concentration rejects or by-products to facilitate recovery of the …

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Procedure for extraction of gold from refractory gold ...

Procedure for extraction of gold from refractory gold containing ore. C22B3/18 - with the aid of micro-organisms or enzymes, e.g. bacteria or algae. C22B11/08 - by cyaniding. FIELD: metallurgy. SUBSTANCE: procedure consists in concentration of ore with production of flotation gold containing concentrates, in bio-oxidation with production of ...

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Atmospheric alkaline pre-oxidation of refractory sulphide ...

Atmospheric alkaline pre-oxidation of refractory sulphide gold ores. Creator. Rego, Alan Joseph. Publisher. University of British Columbia. Date Issued. 2018. Description. Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to ...

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refractory ore | chemistry | Britannica

In gold processing: Extraction from refractory ores Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves (a phenomenon called preg-robbing), or completely surround the…

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Extraction of Silver from Refractory Ores. | National ...

Extraction of Silver from Refractory Ores. PB227190. Publication Date: 1973: Personal Author: ... from mineral leaching studies resulted in development of a sulfur-dioxide-sodium chloride leaching sequence for extracting silver from these types of ores. Silver extractions of 80 to 85 percent were obtained by leaching the ores with a sulfurous ...

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Extraction method for refractory precious metal ore ...

Cyanic extraction of precious metal from comminuted, refractory precious metal ore as well as refractory precious metal concentrates and tailings from such ore is effected with rapidity and high yield by agitationally treating the refractory material with an aerated, alkaline solution containing a high concentration of water soluble cyanide and a low concentration of chemical …

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Clean Utilization of Limonite Ore by Suspension ...

As a typical refractory iron ore, the utilization of limonite ore with conventional mineral processing methods has great limitations. In this study, suspension magnetization roasting technology was developed and utilized to recover limonite ore. The influences of roasting temperature, roasting time, and reducing gas concentration on the magnetization roasting …

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EFFECT OF THE TEMPERATURE CONDITIONS OF SULFATION …

of ores with the extraction of 75% of the natural raw materials components. ... refractory raw materials [19]. The possibility of enrichment of the Kundybai field ore has been studied repeat-

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Process for treating refractory gold ores by roasting ...

Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after roasting …

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Effect of flotation and potassium hydroxide pretreatment ...

Effect of flotation and potassium hydroxide pretreatment of an antimonial refractory ore on the extraction of silver by cyanidation

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Copper Extraction Refractory Gold Processes

Copper Extraction Refractory Gold Processes. ALTA Gold 2012 Edoc Albionprocess A Significant Contemporary Challenge For Gold Mining Companies Is To Define Economic Process Refractory Gold Ores Are Those That Do Not Yield High Gold Recoveries In Conventional Cyanide The High Throughput Ore B Comprise Predominantly Of Pyrite And Small Copper …