Gold Bearing Ore: Precipitate Sodium Sulfide

A hydrometallurgical process for the treatment of complex silver-bearing sulfide ores and concentrates that recovers substantially all silver, lead, antimony, zinc, copper and sulfur, along with the chemical reagents utilized during the process. Finely ground ores and concentrates are leached under heat and pressure with water, sulfuric acid, nitric acid, oxygen, and a catalyst, and are ...

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ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for

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The charts below show original industrial CIP test results on sulfide (pyrite, arsenopyrite) gold ores at a gold mine in Myanmar with eco-goldex O product series. Test results indicate that Eco-goldex O product series has better leaching performance in gold ore leaching kinetics (short leaching time), less reagent consumption rate. (Click the ...

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ZINC-DUST PRECIPITATION OF GOLD. For many years precipitation by zinc dust, as by the Merrill-Crowe process, has been recognized as the most efficient and economical method of precipitating gold and silver from cyanide solutions.Embodying precipitate filters of the plate-and-frame type, of the vacuum-leaf type, or of the more recently developed pressure bag-filter type, the process is in use ...

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Gold ores Flotation sodium sulfide yellow flake. How to sererate the Gold from the Gold ores by usaing sodium sulfide yellow flake. ... added Na2S hydrolysis of S2-and some have the ability to activate the heavy metal ions such as Cu2 generate insoluble sulfide precipitation remove these heavy metal ion activation. Then by adding inhibitors of ...

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CALCIUM SULFIDE PRECIPITATION OF MERCURY DURING CYANIDE LEACH ING OF GOLD ORES By R. G. Sandberg, 1 W. W. Dimpson, 2 and W. L. Staker 2 ABSTRACT Many gold-bearing ores throughout the Western United States contain small quantities of mercury. The presence of …

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leaching in gold sulfide gold processing efficient. Oct 08, 2017· An environmentally friendly leaching process, consisting of the pretreatment of alkaline pressure oxidation and thiosulfate leaching, has been developed to efficiently extract gold from a high carbon, arsenic and antimony bearing sulfide gold …

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Download as PDF - Scientific Research Publishing. Abstract. Cyanidation is the main process for gold and silver recovery from its ores. ... This technology is based on inducing nucleated precipitation of copper and silver in a serpentine reactor, using sodium sulfide as the precipitator, and sulfuric acid for pH control. ..... when leaching sulphide-bearing ores, insoluble CuSCN.

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Gold Cyanide Solution (Leaching Gold With Cyanide) Since the 1890's, cyanide has been used to recover gold from gold bearing ores. And today, over 115 years later, most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal.

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Cyanidation of the leach residues resulted in 90 to 93 pct au and 60 to 80 pct ag extractions, compared with only 5 and 15 pct, respectively, without the pretreatment. The procedure was further tested by leaching a low- grade gold ore and a bulk sulfide flotation concentrate prepared from it.

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SULPHIDE PRECIPITATION OF GOLD AND SILVER FROM THIOSULPHATE LEACH SOLUTIONS. ... For high grade ores or refractory sulfide ores where some pretreatment processing is required to liberate gold, the ...

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precipitation of copper and silver in a serpentine reactor, using sodium sulfide as the precipitator, and sulfuric acid for pH control. 2. Cyanide and Copper Recovery Processes . Sulphide precipitation of metals is a viable alternative process for copper recovery from the barren cyanide so- lutions because of the possible high degree of metal re-

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The present study was undertaken with the objective of finding a suitable reagent for the precipitation and subsequent removal of mercury from gold cyanide leach solution. Three sulfur bearing reagents, sodium sulfide, sodium and potassium dimethyl dithiocarbamates were investigated for their mercury removal efficiencies.

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This chapter describes the treatment of gold- and silver-bearing doré materials to produce refined bullion-grade gold and silver. ... The main reaction between nitrogen dioxide and sodium sulfide in the scrubber is: ... mercury is a byproduct of gold mining in Nevada, USA. The sulfide ores contain 0.1–100 ppm of mercury, which can make its ...

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We report a new synthesis of colloidal gold(I) sulfide nanoparticles by reacting aqueous solutions of sodium sulfide and sodium gold sulfite. Optical absorption spectra and pH were measured during the reaction. The pH changes from 10.3 to 8.8 immediately after mixing the reactants and very slowly decreases during particle growth. The nanoparticles exhibit a continuous increase in absorption as ...

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THE EFFECT OF PROCESS VARIABLES ON CYANIDE AND COPPER RECOVERY USING SART By ... Traditionally cyanide soluble copper has caused many copper bearing gold ores to be considered as ... appearing in the copper sulfide precipitate where they would reduce the precipitates marketability.

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5. Replacement precipitate. 6. Smelting ingot. Preparation of leaching raw materials. For general non-sulfide gold-bearing ores, it is usually grind to 60-70%-200 mesh. Cyanide is added to the grinding operation, and side immersion is performed to improve the leaching efficiency. For sulfide gold-bearing ores, flotation enrichment is often used.

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gold bearing ore precipitate sodium sulfide. Patent WO2013152424A1 Chloride process for the leaching of Oct 17, 2013 A process for the extraction of gold from a gold bearing ore or leachate liquid, stripping with sodium thiosulphate and precipitation to recover gold. . 2010, describes extraction of base metal sulphide ores with a . Get Price

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Dec 15, 2001· We report a new synthesis of colloidal gold(I) sulfide nanoparticles by reacting aqueous solutions of sodium sulfide and sodium gold sulfite. Optical absorption spectra and pH were measured during the reaction. The pH changes from 10.3 to 8.8 immediately after mixing the reactants and very slowly decreases during particle growth. The nanoparticles exhibit a continuous increase in absorption …

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common in sulfide and silicate bearing ores. ... Components of the ore may absorb or precipitate the dissolved gold cyanide complex ... considerable gold, a sulfide complexed species of sodium ...

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containing any number of metals. The alkaline sulfide system is one of these and is essentially a mixture of sodium sulfide and sodium hydroxide. This is a unique hydrometallurgical system as it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic and mercury (1,2,3,4,5,6,7). Worldwide, it is employed

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Oct 22, 2011· The sodium sulfide will regenerate your leach water,so it can be reused. Also it will not drop the copper and other junk with your gold. There is lots of ways to precipitate the gold,but some will drop everything. Some will create a hell of a mess for farther refining too. No two ores are the same,so you may have to play with it, until you get ...

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May 04, 1998· Leaching of Zinc Sulfide by Thiobacillus ferrooxidans: Experiments with a Controlled Redox Potential ... The ore sample was washed with a 0.5 M solution of sodium sulfide to remove flotation agents and to ... Lawson E N, Broadhurst J L. The BIOX® process for biooxidation of gold-bearing ore or concentrates. In: Rawlings D E, editor. ...

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For the processing of refractory gold-bearing refractory and sulfide ores, Flexicone has developed a unique enrichment technology. ... the precipitation of iron and arsenic from solutions proceeds with the formation of goethite and scorodite, which have a crystalline structure. These forms of compounds are the most inert with respect to sodium ...

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containing any number of metals. The alkaline sulfide system is one of these and is essentially a mixture of sodium sulfide and sodium hydroxide. This is a unique hydrometallurgical system as it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic and mercury (1,2,3,4,5,6,7). Worldwide, it is employed

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essentially a mixture of sodium sulfide and sodium hydroxide with other meta-stable alkaline species as required. This is a unique hydrometallurgical system beause it is a very selective lixiviant for the distinct leaching of tin, gold, antimony, arsenic, tellurium, silver and mercury (Anderson, 2000, 2001a,

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The first detailed laboratory study of the influence of sodium sulfide on the flotation of gold-bearing ores was undertaken in the mid-1930s (Leaver and Woolf, 1935). The outcome from this study was that, in general, sodium sulfide retards the flotation of gold, although for some ores …

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In this work, a flow sheet for the recovery of tellurium from the high tellurium-bearing materials by alkaline sulfide leaching and sodium sulfite precipitation combined with downstream treatments was proposed.The effects of various parameters on tellurium dissolution and recovery of dissolved tellurium by sodium sulfite precipitation have been systematically investigated.

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Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.5, and at least 0.05% sulfite ion.

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Sep 17, 2012· Hi, I can precipitate gold dissolved in aqua regia if the gold is just pure.I use sodium metabisulfite.However,if I dissolve the gold from ore in aqua regia,I cannot precipitate the gold.What's wrong?Might other metals or mud in the soil spoil it?Does anything prevent precipitating?Any help will be highly appreciated.Thanks a lot in advance.

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