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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 lixiviant of a...

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New Technology for Recovery of Gold and Silver by Pressure - InTech

Feb 1, 2012 ... for treatment of gold/silver-bearing sulphidic materials. ... Details of this electrochemical reaction have received ... Lime or sodium hydroxide (caustic) ... Gold and silver ores are classified as refractory when a significant portion...

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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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Download as PDF - Scientific Research Publishing

Jan 25, 2015 ... 1) dissolution of gold from ores by an alkali cyanide solution; ... Accordingly, the sodium cyanide concentration (molecular weight of NaCN ... Sulphide precipitation of metals is a viable alternative process for copper .... present, as is often the case when leaching sulphide-bearing ores, insoluble CuSCN may.

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draft process descriptions and material flows for gold ore processing ...

Jan 22, 2001 ... Almost all gold mining and mineral processing conducted in North America relies on .... Some facilities add sodium sulfide to the gold-bearing solution prior to carbon adsorption. This causes precipitation of mercury sulfide,.

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Gold - Encyclopedia - Theodora.com

The specific gravity of gold obtained by precipitation from solution by ferrous sulphate .... formed during the disintegration of the gold-bearing metalliferous veins. ..... NaAuS 4H 2 O, is prepared by fusing gold with sodium sulphide and sulphur,...

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The role of ligands and oxidants in thiosulfate leaching of gold

(iv) the effect of particular minerals to adsorb or precipitate gold and/or ... Despite the fact that the gold mining industry ... 0.3 M sodium thiosulfate and 3 M ammonia (pH 10.2) in the ... extraction of gold and silver from complex sulfide ores by.

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Managing copper in leach solution at the Çöpler gold mine ... - Botz

Aug 2, 2011 ... of soluble sulfide to a copper-bearing leach solution will result in the ... reaction is (assuming the use of sulfuric acid for pH adjustment):.

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METHOD FOR THIOSULFATE LEACHING OF PRECIOUS METAL ...

May 6, 2010 ... As used herein, a "precious metal" refers to gold, silver, and the platinum ... Summing equations (2) and (3) yields the overall thiosulfate leach reaction for gold: .... The precious metal-bearing material includes ore, concentrates, tailings, ..... Examples of preferred reagents include ammonium sulfide, sodium...

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Application of SART to Heap Leaching of Gold-Copper - SGS

52,000 t/day of gold bearing ores from the Verde ... emitters and make-up cyanide (sodium cyanide) is ..... sulphide precipitate is recyled back to the reactor to...

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Preliminary Model of Porphyry Copper Deposits - the USGS

They found gold in quartz veins, attached to sulfide grains, and as free gold along silicate ... phase separation in ore-metal fractionation and mineral precipitation ... porphyry copper district and concluded that an aqueous fluid, rich in sodium,...

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How do i separate gold from sulphides without using chemicals or ...

Jun 26, 2009 ... How do you know "much of the gold from the gold veins was left .... The gold and silver are precipitated from the solution by the addition of Zinc powder. ... Eg; sulfuric acid will dissolve copper, and not a lot of any thing else.

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Solution for precipitating gold from HAuCl4 solution - Finishing

Q. Precipitate gold from aqua regia. I'm investing about gold precipitating from aqua regia. I know sodium metabisulfite, ferrous sulfate. But I want to learn more...

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silver Facts, information, pictures | Encyclopedia.com articles about ...

It is often used to make alloys with gold for some of these applications. ... The product of this reaction is silver sulfide (Ag2S), a black compound. ... Ores rich in silver disappeared long ago due to mining. .... or towers containing activated carbon, and the addition of a sodium sulfide solution, which forms a silver precipitate.

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Gold concentrations of magmatic brines and the metal budget of ...

Extremely saline fluids, precipitating quartz and ore minerals in veins have been ... an internally precipitated copper sulphide crystal to which gold is attached. ... A reduced set of elements (silicon, sodium, copper, gold and arsenic), and an...

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Silver - How Products Are Made

Although it is usually found in ores with less rare metals, such as copper, lead, ... Silver mining in North America dates back to the eighteenth century. .... and the addition of a sodium sulfide solution, which forms a silver precipitate. ... Silver is rarely found alone, but mostly in ores which also contain lead, copper, gold, and...

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Basement Chemistry for the Prospector - Acids and Bases

Everyone who has worked with and/or prospected for gold has on at least a few occasions ... Some of the more useful bases are sodium hydroxide (caustic soda), Potassium ... The weak bases have little practical use in mining so we will just ignore them. ... The reaction and liberation of heat can be, and usually is, violent.

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A Method for Leaching or Dissolving Gold from Ores - Francois ...

native gold from gold-bearing ores or ... hazardous chemicals such as sodium .... burette.14 Reducing reactant for precipitating gold such as iron (II) sulfate and...

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platinum group | chemical element group | Britannica.com

Jan 11, 2015 ... Although platinum-containing gold artifacts have been dated as far back ... Platinum minerals are usually highly disseminated in sulfide ores, ... The major South African and Canadian deposits are exploited by underground mining. ... at high temperature, dissolved in water, precipitated with sodium nitrite,...

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Day 54, Gold extraction by cyanidation | Rio Suerte

Sulphide bearing ores, or carbonates, require additional treatment before the ... a silver precipitation with Na2S optional when the ratio silver / gold in solution is...

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Pre-treatment of a refractory gold sulfide ore by means of ... - SciELO

In several gold ores, gold is trapped in the matrix of metallic sulfides, mainly pyrite ... possible coating of gold particles with precipitates (specially iron hydroxides) during ... The sulfuric acid formed was analyzed by titration with 0.01N sodium .... D. Lampshire, "Biooxidation of an arsenic-bearing refractory gold ore", Miner.

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The Agency of Manganese in the Superficial Alteration and ... - JStor

would be precipitated by the ferrous sulphate produced through the action of ... 7 "The Formation of Bonanzas in the Upper Portions of Gold-Veins," Trans.,. XXXI ..... In experiment 18, sodium hydroxide was added to 50 c.c. of one-tenth normal...

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Chapter 8: Metal Extraction - InfoMine

The initial cementation process involved introduction of a gold-bearing cyanide ... introduction, zinc precipitation was improved by adding a lead salt (usually ... method of desorption was quickly developed using a caustic sodium sulfide solution, followed .... CIP loading involves the introduction of leach liquor or ore pulp into.

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Improving the Economics of Gold-Copper Ore Projects Using SART ...

recovery of the copper by precipitation with sulphide reagent. This paper ... of sulphide precipitation at these plants using either chemical reagent sulphide, such as sodium .... gold bearing ore goes through cyanide leaching followed by CIP.

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Sulfide of the Modern Kamchatka Hydrothermal Systems

Apr 25, 2015 ... most common mineral precipitated at the discharge of hydrothermal style. It varies in mode of .... The waters are sulphate-sodium bicarbonate, siliceous in .... sulfide formations from gold-bearing conglomerates Witwatersrand.

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