Our using sodium sulfite to leach gold ore

CN101157986A - Rapid nontoxic gold extracting method ...


The method uses the solution of sodium bromate, sodium chloride and vitriol as the gold leaching solution, polyurethane foam as the substance to absorb gold, sodium sulfite solution as a desorption agent, oxalic acid as a reducing agent, hydrochloride solution as recycling agent of polyurenthane foam, extract gold from oxide ore with the sulfur ...

Gold recovery from thiosulfate leaching - Free Patents Online


Mar 20, 2003· Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjectin ... ammonium thiosulfate and sodium sulfite. Gold and optionally copper are recovered from the eluate by electrowinning or precipitation.

How is cyanide used in gold mining - Answers


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 ...

Gold(I) sulfide - Wikipedia


Gold(I) sulfide is the inorganic compound with the formula Au 2 S. It is one of two principal sulfides of gold, the other being gold(III) sulfide (Au 2 S 3). Both materials are unstable with respect to the elements. Structure and preparation.

A Novel Technique for Silver Extraction from Silver ...


A Novel Technique for Silver Extraction from Silver Sulphide Ore S. AYATA, H. YILDIRAN Ege University, Science Faculty, Chemistry Department, ... The process was based on the reaction between silver sulphide thiosulphate and sulphite ions according to ... A.E. Hunt and D.L. Lampshire, 'Leaching Gold-Silver Ores with Sodium Cyanide and ...

Sodium Hyposulphite - chestofbooks.com


Caustic potassa (concentrated lye) may be used in place of caustic soda, making potassium polysulphide, and then potassium hyposulphite with sulphurous acid and air. The potassium salt answers the same purpose as that of sodium. Sodium hyposulphite may also be made by heating a solution of sodium sulphite with sulphur. The latter is dissolved.

Gold Ore Roasting Plant - Mineral Processing & Metallurgy


The gold contained in the ore occurs at an average of. 17 opt (ounces per ton of ore). The gold is within the sulfide mineral matrix, which is not exposed (and therefore can not be dissolved by) a cyanide leach solution. Also the ore contains carbonaceous matter which absorbs gold in the conventional leaching …

US6632264B2 - Gold recovery from thiosulfate leaching ...


Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an …

Gold Extraction in Carbonaceous Ore using Thiosulfate


This compares to no gold extraction using a direct cyanide leach and 82 pct using cyanide on roasted ore. Column leaching tests with thiosulfate further demonstrated that 69 to 78 pct of the gold could be directly recovered while consuming 0.4 to 5.4 kg thiosulfate/mt ore.

Effect of Pretreatment of Sulfide Refractory Concentrate ...


The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals. This process was conducted and evaluated under cyanide and oxygen ...

Pre-Reducing Process Kinetics to Recover Metals from ...


Sodium sulfite was used to reduce the potential of solution, converting ferric iron to ferrous iron, while the reducing process was studied before using sodium dithionite and sodium metabisulfite [19, 20, 29]. Three synthetic solutions were prepared to simulate real conditions of nickel laterite leach waste from the limonite ore.

How to Use Bleach on Gold Ore to Remove Gold | Sciencing


Apr 24, 2017· How to Use Bleach on Gold Ore to Remove Gold ... Add the sodium bisulfate solution to the gold chloride solution. Leave it to settle for four hours. Observe the brown powder at the bottom of the flask. This is the gold that has precipitated out of the solution. ... How to Leach Gold Ore With Chlorination. How to Refine Gold With Nitric Acid.

The study of the kinetics of gold leaching in the ammonium ...


The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the cathodic process, which is under diffusion or mixed kinetics control. The results of the rotating gold disk leaching study are consistent with those from the electrochemical study.

Study on oxygen pressure thiosulfate leaching of gold ...


Thermodynamic calculations showed that the improvement of temperature and pressure was favorable to gold leaching by thiosulfate. However, high temperature and pressure also caused high thiosulfate consumption (55.3 kg/t-ore of sodium thiosulfate) and relatively low gold …

How to Leach Gold Ore With Chlorination | Sciencing


Apr 25, 2017· How to Leach Gold Ore With Chlorination ... The use of chlorine is both the cheapest and most plentiful method for leaching gold. When you mix sodium chloride and hydrochloric acid together, you produce a form of electrolysis that removes gold from rock and soil.

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill ...


Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, ... Will sodium sulfite drop gold from sodium gold cyanide solution? Please also explain the reaction between the two. Thanks in advance! ... I am also interested in onther green teks for gold ore leach.

The Application of Diagnostic Leaching to Copper and Gold Ores


The Application of Diagnostic Leaching to Copper and Gold Ores ... C- Copper Oxides and Carbon ates by Sulfuric Acid-Sodium Sulfite ... cyanide leaching of a copper sulphide bearing gold ore ...

Method to extract gold from telluride ores and concentrates


The task can be achieved using the method of extraction of gold from telluride ores and concentrates, including cyanide leaching, characterized in that prior to cyanide leaching is carried out restoration processing of the feedstock solution containing sodium sulfite as a reducing agent, followed by separation of the solution from the cake ...

Sulfur dispersing agents for nickel sulfide leaching above ...


Oxygen pressure leaching experiments were performed at 140 or 150ºC under 690 kPa oxygen overpressure. The particle size of the nickel concentrate was found to be an important factor in leaching. During the leaching of nickel concentrate with P₈₀ of 48 µm, the SDAs were believed to be fully degraded before nickel was fully extracted.

Cyanide Analysis Guide - Xylem Analytics


used in the production of nylon 6/6 and methyl methacrylate plastics. Potassium or sodium cyanide are used in mining operations to leach gold from ore. Cyanide salts are used in metal plating baths for electroplating of brass, bronze, cadmium, copper, gold, silver and zinc. Other industrial processes employing cyanide

sodium sulfite and gold leaching


Study on Thiosulfate Leaching of Gold by Cycling Barren ... By supplementing thiosulfate and copper into the cycling solutions to the same concentration as the initial fresh solution, associated with addition of a certain amount of sodium sulfite as stabilizer, the gold leaching rate was favorably stabilized as being up to 63.0% during four cycles.

Solution for precipitating gold from HAuCl4 solution


Solution for precipitating gold from HAuCl 4 solution. A discussion started in 2005 but continuing through 2018. 2005. Q. Respected Sir, My technical problem is how to precipitate gold from HAuCl 4 solution. We recover gold from Filings, Setting, Waste water, Consumables used in production, Emery papers, and sweeps from the production floors.

Alternative Lixiviants to Cyanide for Leaching Gold Ores ...


The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90% Au and <1% Cu from oxidised copper–gold ores using ...

Thiosulfate - Wikipedia


Thiosulfate extensively forms complexes with transition metals hence a common use is dissolving silver halides in film photography developing. Thiosulfate is also used to extract or leach gold (sodium thiosulfate) and silver from their ores as a less toxic alternative to cyanide. Nomenclature

Gold Sulfite - Mineral Processing & Metallurgy


Sulphites of Gold, alkaline sulphites, or sulphur dioxide, which reduce gold trichloride easily, do not produce the same effect on a solution of an alkaline aurate. If sodium bisulphite is added to a boiling solution of sodium aurate (NaAuO2) a yellowish precipitate is formed, soluble in excess of sodium bisulphite, and consisting of a double sulphite of gold and sodium, or sodium auro ...

Author: Subject: Recovery of gold using HCl - Sciencemadness


Jul 11, 2013· Recovery of gold using HCl + H2O2 I tried to UTFSE, but most of the posts seemed to address other issues later in the process. I'm a beginner, but having a blast tinkering, so please bear with me.. I have a handful of gold-plated computer scrap. I don't have easy access to aqua regia, so I'm trying an alternate method using HCl + H2O2 (link below).

US4778519A - Recovery of precious metals from a thiourea ...


A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing materials with a thiourea solution to form a thiourea leach, and the thiourea leach is contacted with carbon to adsorb the gold and silver ...

Enhancement of gold extraction from biooxidation residues ...


Stirring and room temperature were maintained during the leaching step. 100 ~ 80 e- 60 ~ 40 X = 20 0 0 v y -O--Thiourea +sodium sulfite I I I I I I 2 4 6 8 10 12 Thiourea / g / kg ores Fig. 2 Comparison of thiourea consumption between the lixiviants containing sodium sulphite and no sodium sulphite.

Gold Recovery Process from Primary and Secondary Resources ...


By using these biosorbents, recovery of gold from actual samples of printed circuit boards of spent mobile phones and Mongolian gold ore was investigated. Recovery of trace concentration of gold(I) from simulated spent alkaline cyanide solution was also investigated using the bioadsorbent.

Sulphide Flotation - an overview | ScienceDirect Topics


Gold and copper loadings onto the strong-base resin were ∼2.5 bkg/t Au and ∼2 kg/t Cu. Copper was eluted from the resin using 0.5 mol/L ammonia thiosulfate and gold was eluted using sodium chloride and sulfite mixture. The copper-bearing eluate was returned to the leaching circuit and the gold …

Thiosulfate leaching of gold—A review - ScienceDirect


Copper is eluted from the resin using ammonia thiosulfate (200g/L) and gold is eluted using Thiosulfate leaching of gold--a review 163 potassium thiocyanate (200g/L). The copper-bearing eluate is returned to the leaching circuit while the gold eluate is either electrowon or precipitated.

The role of ligands and oxidants in thiosulfate leaching ...


The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake A.J. Parker Cooperative Research Centre for Hydrometallurgy, Department of Mineral Science and Extractive Metallurgy, Murdoch University, Perth, WA 6150, Australia Abstract The widely used cyanidation technology is not applicable to some gold ores due to economic or

Enhancement of gold extraction from biooxidation residues ...


Feb 01, 2001· Read "Enhancement of gold extraction from biooxidation residues using an acidic sodium sulphite-thiourea system, 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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