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treatment of refractory ores

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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Gold Mining Process Development – Denver Mineral Engineers

Copper/gold ores that require uneconomically high quantities of cyanide to process due to the solubility of copper in cyanide. A multitude of other unfavorable constituents including pyrrhotite, tellurides, antimony, and arsenic. It should be noted that most of the refractory ore treatment processes are expensive and frequently economical only .

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Treatment of refractory carbonaceous sulfide ores for gold .

May 08, 1990 · Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation; the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not improve the yields on any economic basis.

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The Treatment Of Refractory Ores

The ore freed from its refractory constituents is then fed into a vessel containing the fluid metal, in which each particle of ore is separated from the others, and being acted upon by the fluid metal is absorbed into it, the tailings or refuse passing off freed from any gold which may have been in the ore. APPARATUS FOR THE TREATMENT OF .

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Microbial Pretreatment of Refractory Gold Ore - Xinhai

Gold ore which is difficult to concentrate often referred to gold or refractory gold ore, which use conventional cyanide process cannot effectively extract most of the gold ore. Therefore, it is commonly said that the treatment of gold is the case of the cyanide method.

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John T. Boyd Company – Refractory Ore Specialist .

Refractory ore development has culminated in BOYD's access to exclusive systems for the development and operation of sulfide precious metal refractory ores. BOYD refractory ore evaluation services include: Complete financial evaluation packages with associated detailed cost estimating components for all refractory ore treatment options.

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Treatment of Refractory Gold Ores - XPS

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultra-fine milling, followed by a hot atmospheric leach –the Albion Process.

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Treatment of Alaskan refractory gold ores: updating data .

TREATMENT OF ALASKAN REFRACTORY GOLD ORES UPDATING DATA FOR ECONOMIC DEVELOPMENT OF REGIONAL GOLD DEPOSITS The U.S. Bureau of Mines investigated treatment of gold and silver refractory ores and concentrates that respond poorly to conventional cyanidation techniques due to the complex mineralogy of the ore.

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Chemical Used in Gold Mining - "Refractory Gold ore"

Apr 07, 2015 · Chemical Used in Gold Mining - Refractory Gold Ores . The gold also occurs as sub microscopic particles in sulphides or as absorbed gold onto surfaces of carbonaceous matter. Because of the variation of these refractory ores, gold occurrence is ore specific and before process decisions are made, competent mineralogical and metallurgical evaluation must be carried before final process .

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Gold extraction - QueensMineDesignWiki

Finally, refractory ores require additional chemical reagents or pre-treatment processes to attain sufficient gold recovery. This portion of the article will focus on the origins, characteristics, and required processing techniques for free-milling, complex and refractory ores. Cyanidation Response

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Chemical Used in Gold Mining - "Refractory Gold ore"

Apr 07, 2015 · Chemical Used in Gold Mining - Refractory Gold Ores . The gold also occurs as sub microscopic particles in sulphides or as absorbed gold onto surfaces of carbonaceous matter. Because of the variation of these refractory ores, gold occurrence is ore specific and before process decisions are made, competent mineralogical and metallurgical evaluation must be carried before final process .

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Treatment of Refractory Gold Ores | SpringerLink

Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when "normally ground" are defined as refractory.The term, as well as the technical methods used to treat such ores, are relatively new.

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Review Pretreatment Process on Refractory Gold Ores with As

Atmospheric acid treatment usually uses permonosulfuri-cacid to oxidize refractory gold or e with As. It's said that the method is not suitable for all refractory gold ores, but has good results in dealing with symbiotic arsenopyrite gold ore. Because arsenopyrite is easily oxidized. Compared with roasting pretreatment and pressure oxida-

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Carbon-in-Chlorine Treatment of Refractory Gold Ores - AusIMM

The U.S. Department of Interior, Bureau of Mines, is investigating the treatment of refractory gold ores. Chlorination in the treatment of refractory gold ores is applicable in many low-grade gold operations. When usable, this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon. Chlorination, however, is a pretreatment technique that requires.

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Treatment of refractory carbonaceous sulfide ores for gold .

May 08, 1990 · Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation; the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not improve the yields on any economic basis.

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US4902345A - Treatment of refractory carbonaceous and .

The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation leaching.

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Refractory ore | chemistry | Britannica

Other articles where Refractory ore is discussed: 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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Energy and Water Requirements in the Treatment of .

non-refractory ores This paper will provide an overview of the energy and water requirements for treating refractory gold ores, a topic which does not appear to have been considered previously in the literature. CITATION: Roberto, F, Snyder, J, Dodd, J and Dunne, R, 2013. Energy and water requirements in the treatment of refractory gold ores, in

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(PDF) Cyanidation of Refractory Gold Ores: A Review

Cyanidation of Refractory Gold Ores: A Review R.K. Asamoah, R. K. Amankwah and J. Addai-Me nsah Ian Wark Research Institute, The ARC Special Research Centre for Particle and Material Interfaces .

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MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY .

one of the leading emerging pre-treatment techniques being employed for the processing of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms.

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Treatment of pyritic matrix gold–silver refractory ores by .

Jan 01, 2006 · Read "Treatment of pyritic matrix gold–silver refractory ores by ozonization–cyanidation, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Treatment of pyritic matrix gold–silver refractory ores by .

Treatment of pyritic matrix gold–silver refractory ores by ozonization–cyanidation

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:: Maelgwyn Minerals' Leachox Refractory Gold Process hits .

It's now over 10 years since the European Patent Office advised its decision to grant Maelgwyn Mineral Services Ltd (MMS) a European Patent for its Leachox process for the treatment of refractory gold ores. Since that time the process route has become the industry leader in the low-cost recovery of gold from refractory and sulphide orebodies.

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Gold extraction - Wikipedia

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Processing technologies for gold-telluride ores | SpringerLink

Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. The classification and main physical properties of gold telluride ores were described, and possible treatment methods including flotation, leaching, and oxidation were reviewed.

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Bacterial oxidation - Wikipedia

Bacterial oxidation is a biohydrometallurgical process developed for pre-cyanidation treatment of refractory gold ores or concentrates. The bacterial culture is a mixed culture of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans.

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Use refractory in a sentence | refractory sentence examples

The Francke-Tina process, named from Francke, German consul at Bolivia, and tina, the wooden vat in which the process is carried out, was developed in Bolivia for the treatment of refractory ores rich in zinc blende and tetrahedrite (fahl-ore).

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US4902345A - Treatment of refractory carbonaceous and .

The recovery of precious metals from refractory carbonaceous and sulfidic ores or concentrates is improved by subjecting an oxidized slurry of this type of ore to thiourea leaching in the presence of carbon instead of subjecting the slurry to cyanidation leaching.

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Refractory | Meaning of Refractory by Lexico

'Also under investigation as possible container materials are certain types of refractory ceramics.' 'Mr Mills said KCM had for the past year been carrying out tests to determine the economic value of the dumped refractory ores in an effort to recover and process the hundreds of tonnes of copper.'

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ALBION PROCESS FOR TREATMENT OF REFRACTORY ORES

ALBION PROCESS FOR TREATMENT OF REFRACTORY ORES Duncan Turner (Core Resources) Mike Hourn (Xstrata Technology) 2 Presentation Topics • Overview of Albion Process • Fine Grinding - IsaMill • Sulphide Oxidation - Albion Process • Commercial Plant - Flowsheet & Equipment

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