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US4559209A - Leaching refractory gold ores - Google Patents

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value …

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International Journal of Mineral Processing

Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony P. Karimia,⁎, H. Abdollahia, A. Aminib, M. Noaparasta, S.Z. Shafaeia, F. Habashic a ...

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Gold Cyanidation Process - 911 Metallurgist

The gold cyanidation process is the most important method ever developed for extracting gold from its ores. The reasons the widespread acceptance of cyanidation are economic as well as metallurgical. It usually obtains a higher recovery of gold than plate amalgamation and is easier to operate than the chlorine or bromine process.

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(PDF) The Application of Roasting Pretreatment for ...

Improved gold and silver extraction from a refractory antimony ore by pretreatment with alkaline sulphide leach. ... Improvement of Cyanidation of Antimonial Refractory Gold/Silver Ores by Ultrafine Grinding in a Stirred Mill. By ibrahim alp. 24-Alkaline sulphide pretreatment JOM. By …

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Cyanidation of gold ores c.pdf - Free Download PDF Ebook

Download Cyanidation of gold ores c.pdf... International Journal of Mineral Processing 95 (2010) 68–77Contents lists available at ScienceDirect International Journal of Mineral Processing j o u r n a l h o m e p a g e : w w w. e l s ev i e r. c o m / l o c a t e / i j m i n p r o Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony P. Karimi …

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Wet preprocessing method for difficult-to-treat gold ore ...

Wet preprocessing method for difficult-to-treat gold ore containing arsenic and antimony. Cite. Download. Patent: CN-100371478-C: Inventor: HUABEI OU (CN) Assignee: HUABEI OU (CN) Dates: Grant . 2008/02/27.

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Reagents and Chemicals Archives - Page 10 of 12 - Mineral ...

The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment, realgar, and stibnite is usually difficult or even impossible. Extractions are low and the solutions soon become 'foul.' The gold in such ores could be free and uncoated, and no trouble in dissolving it in clean ...

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CN100371478C - Wet preprocessing method for difficult-to ...

The present invention discloses a method for pretreating arsenic and antimony containing gold ore which is difficult to treat in a wet method and extracting gold without using cyanogen. Because micro and fine particle impregnating type arsenic and antimony containing gold ore contains hazardous elements, such as arsenic, antimony, sulfur, organic carbon, etc., the …

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Arsenic and Antimony Sulphide Minerals in Cyanidation

The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment, realgar, and stibnite is usually difficult or even impossible.Extractions are low and the solutions soon become 'foul.' The gold in such ores could be free and uncoated, and no trouble in dissolving it in clean cyanide solutions would be …

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Treatment of Antimonial Gold Ores - ScienceDirect

The rate of oxidation of stibnite is strongly dependent on pH with appreciable dissolution at pH 12, reducing to low levels at pH 10. Figure 52.1 shows Hedley and Tabachnick's (1958) results of the cyanidation of a synthetic ore containing 0.25% stibnite at pH values of 10, 11, and 12. At higher pH values, higher levels of antimony pentoxide have been observed on …

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(PDF) Cyanidation of gold ores containing copper, silver ...

Abstract. Cyanidation tests on two ore samples from two different gold deposits are reported. The first sample contained 10.5 ppm gold with high …

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Cyanidation of gold ores containing copper, silver, lead ...

Cyanidation tests on two ore samples from two different gold deposits are reported. The first sample contained 10.5. ppm gold with high arsenic and antimony.. The second sample had a low gold content (2.5 ppm) but a high silver content (160 ppm).The first series of test work focused on the determination of conditions for extracting gold from the …

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Silver MIning Solution - Mineral Processing

Flotation-cyanidation The sulfide ore containing gold and silver quartz veins is subjected to flotation to obtain a small amount of concentrate, which is then cyanidated. Compared with the whole mud cyanidation process, the flotation concentrate cyanidation has the advantages of not requiring fine grinding of all ores, saving power consumption ...

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cyanide gold ore

The leaching and adsorption behaviour of gold ores. 4.4 the effect of copper cyanide on gold leaching from oxide and sulphide ores 110 4.5 summary 114 chapters preg-robbing phenomena in the cyanidation of gold ores 116 5.1 objectives of this chapter 116 5.2 background information 116 5.3 preg-robbing behaviour by the … Keep Reading

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CN103924102B - Method for removing antimony from ...

The invention relates to a method for removing antimony from refractory gold ore and preparing cubic crystal sodium pyroantimonate. The method comprises steps of leaching the antimony containing refractory gold ore in a mixed system of Na2S and NaOH, so as to dissolve the antimony into leaching agent in the form of sulfo-antimonous acid sodium, …

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Antimony Mobilization through Two Contrasting Gold Ore ...

Antimony, a toxic metalloid similar to arsenic, is present at variable levels in most gold-bearing rocks. Antimony is soluble in the surface environment, so antimony (Sb) mobilization in mine waters is an environmental issue around gold mines. The Reefton gold mine was originally developed in gold-bearing quartz veins; Sb concentrations were low (<100 …

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What Are the Methods for Gold Processing?

The ore is required to contain no elements harmful to cyanidation such as copper, arsenic or antimony. 6. Flotation-Cyanidation Combined Method. This gold processing method is applicable to the gold-bearing pyrite quartz vein ore which is closely related to the symbiotic relationship between gold and sulfide.

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Evaluation of leaching parameters for a refractory gold ...

Gold ores containing stibnite are usually processed at a pH lower than 10 to avoid the dissolution of antimony that precipitates gold in solution. The use of pH 9.8 did not improve gold extraction, which was only 75.9%. The increase of lead nitrate reached an optimum gold extraction of 81.9% with 500 g/t. Download : Download full-size image ...

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「aurostibite leaching」

Emerging technologies in cyanidation of gold and silver: a . Aurostibite, a gold antimony mineral AuSb 2, converts to AuSbO 3 in alkaline solution, reducing the extraction of gold. The usual process to recover gold from ores containing aurostibite is flotation, pretreatment of the concentrate in aqueous solution with lead nitrate and leaching in

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(PDF) Determination of the Leaching Parameters for a ...

Specific leaching strategies were developed to improve cyanidation of gold ores containing sulphide minerals such as pyrrhotite, chalcopyrite, pyrite and stibnite, and ultrafine flotation ...

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Selection on the Process for Removing and Recovering ...

Abstract. It is well known that the gold ores containing a high content of arsenic and antimony are very refractory. In this paper, the adverse effect of antimony on the extraction of gold by pretreatment-cyanide leaching was discussed in detail.

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The Ultimate Guide to Gold Cyanidation

The tube is located between the bottom of the tank and the bottom of the filter. After the alluvial ore is treated with the cyanide solution, it is washed with water to wash out the gold-containing solution remaining in the ore. The gold-containing solution flowing out of the tank is sent to a displacement precipitating device to precipitate gold.

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Lime-Assisted Cyanide Leaching of Refractory Gold Ores ...

Karimi P, Abdollahi H, Amini A, Noaparast M, Shafaei SZ, Habashi F (2010) Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony. Int J Miner Process 95(1–4):68–77 CrossRef Google Scholar. 10. Bodlander G (1896) Die chemie des cyanidverfahrens.

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Cyanide Leaching Chemistry & Gold Cyanidation

Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2 H20 = 4 NaAu (CN)2 + 4 NaOH. Cyanide Leaching Chemistry. In a relatively simple system of this type the gold dissolves readily. The only requirements are that the gold be free and clean, that the cyanide solution contain no ...

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Emerging technologies in cyanidation of gold and silver: a ...

Gold extraction and cyanide consumption were 95% and 7.4 kg/t. The Kupol mill was the first commercial application of the CELP. The plant processed a high grade free milling gold/silver ore containing 28.2 g/t Au, 324.8 g/t Ag and approximately 0.5% pyrite during 2008 operation.

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Direct cyanidation and roasting combination of a semi ...

In this study, cyanidation experiments were carried out on a massive sulfide ore sample, whose grades of the precious metals gold and silver were found to be 4.2 g/t and 311.9 g/t, respectively. Other elements in the ore were arsenic with average grade of 1,751.6g/t; antimony, 619.7 g/t; zinc, 781.4 g/t; copper, 454.6 g/t; lead, 101.8 g/t; mercury, 324.3 g/t; and …

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Gold Percolation Cyanidation - cnlitereagent.com

The cyanide solution slowly permeates the ore layer to dissolve the gold. The gold-containing solution (pregnant liquid) passes through a filter bottom (false bottom) slightly higher than the bottom of the tank, and flows out of the pipe on the wall of the tank. The tube is located between the bottom of the tank and the bottom of the filter.

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Optimizing and evaluating the operational factors ...

In fact, today, cyanidation is the only choice for the recovery of gold from low-grade and finely disseminated gold ores in both technological and economical respects. Two of the main advantages of cyanidation are the selectivity of free cyanide for gold dissolution and the extremely high stability of the cyanide complex [ 6 ].

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5 Methods of Gold-Silver Ore Extraction | Mining Pedia

The sulphur antimony copper silver ore and argentojarosite cannot be extracted by cyanidation. When formulating a cyanidation system for silver-containing ore, the following measures should be taken: 1) Leach with concentrated cyanide solution (0.2~0.6% NaCN); 2) Long time (up to 2 to 3 days) leaching; 3) Inflate strongly into the pulp;

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Gold Cyanidation Heap Leaching - cnlitereagent.com

The ore doesn't contain carbonaceous material capable of adsorbing gold cyanide complex; 6. Does not contain a large number of compounds that can react with cyanide solution, such as partially oxidized antimony sulfide, zinc sulfide, iron sulfide, copper sulfide and arsenic-containing minerals.

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recovering gold with cyanidation process

06/08/2019· Cyanidation is themon method of leaching gold from ore, but not all leach reactors are made equal. On large scale gold recovery operations, even the smallest of changes can have a major impact on overall performance.

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Extraction of Gold Then, Now and the Future

Gold Cyanidation Ban The use of cyanide in mining operations is facing increasing public opposition due to its toxicity with some countries banning it completely. America: Cyanide utilisation in gold processing has been banned in some states. The US state of Montana in 1998 The US state of Wisconsin banned the in 2001.

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Establishing thE ProcEss MinEralogy of gold orEs

be recovered by whole-ore cyanidation, or some combination of flotation and cyanidation. Acceptable extraction of refractory gold can only be achieved by employing a pre-oxidation process prior to cyanide leaching. Antimony, bismuth sulfide and telluride gold ores: Antimony, bismuth sulfide and telluride gold ores are often somewhat

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Heap leaching of gold ore - Afuruika

Heap leaching is an effective gold ore processing technology for low grade gold ores.Heap leaching is also one of the cyanide leaching methods.This method is mainly used to deal with oxidized ore, by-product ore or off-balance ore produced in the process of shaft opening up, which all contain low-grade gold, and also used to deal with gold-bearing tailings and gold …

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Bio-oxidation of refractory gold ores containing stibnite ...

Arsenic and antimony are environmental pollutants associated with several diseases, including skin cancer. One of the main sources of both elements is the oxidation of sulphide minerals, particularly arsenopyrite and therefore any of both elements is a concern in gold mining operations because arsenic- and antimony-bearing sulphides may contain …

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