Customer case aboutammonium thiosulfate mineral processing gold leaching

ammonium thiosulfate mineral processing gold leaching

Ammoniacal thiosulphate leaching of gold ore

The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 Ammoniacal thiosulphate leaching of gold ore R.K. Rath, N. Hiroyoshi, M. Tsunekawa*, T. Hirajima Laboratory of Mineral Processing and Resources Recycling, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

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THIOSULPHATE LEACHING AN ALTERNATIVE TO

SGS MINERALS SERVICES T3 SGS 869 10-2008 CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. chemical components of the leaching process (ammonium thiosulphate and ammonium sulphate) are

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The treatment of copper–gold ores by ammonium thiosulfate

Oct 01, 2002 Newmont Gold evaluated the application of ammonium thiosulfate on a demonstration heap leach of 327,000 metric tons of low-grade carbonaceous sulfidic ore that was pretreated by biooxidation. The average gold recovery for thiosulfate heap leach at a particle size of minus 1.9 cm was found to be approximately 55%.

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THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE

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. The gold leaching process in ammonium

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Ammonium thiosulfate extraction of gold from printed

Jan 01, 2020 Leaching of the metals from PCBs was investigated with varying solid-to-liquid ratio in ammonium thiosulfate solution. As illustrated in Fig. 3, the increase in solid-to-liquid ratio from 0.1 g to 1 g/10 ml resulted in the decrease of metal extraction. At the maximum solid-to-liquid ratio in the present study (i.e., 1 g/10 ml), Au extraction was <5% due mainly to the lack of leaching reagent

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Improvement of thiosulfate stability in gold leaching

May 01, 2003 高达10%返现 Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However, the major problem with this leaching method has been the high consumption of reagents. To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH4)2S2O3, 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing, thiosulfate

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The treatment of copper-gold ores by ammonium thiosulfate

The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals

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THE STUDY OF THE KINETICS OF GOLD LEACHING IN THE

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. The gold leaching process in ammonium

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Ammoniacal thiosulphate leaching of gold ore

The European Journal of Mineral Processing and Environmental Protection Vol.3, No.3, 1303-0868, 2003, pp. 344-352 Ammoniacal thiosulphate leaching of gold ore R.K. Rath, N. Hiroyoshi, M. Tsunekawa*, T. Hirajima Laboratory of Mineral Processing and Resources Recycling, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

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Gold Leaching by Thiosulfate Solution and Recovery OneMine

Jan 01, 2003 "In this investigation, a sponge gold sample (99.92% pure) has been leached with ammonium thiosulfate solution. The effects of CuSO4, (NH4)2S2O3, (NH4)2SO4, NH4OH and retention time on the gold leaching % (extraction %) and thiosulfate oxidation % (consumption %) have been studied. The copper ion acts as a catalyst in gold dissolution.

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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

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(PDF) Thiosulfate leaching of gold—A review Mark Aylmore

Hemmati et al. (1989) investigated the thiosulfate leaching of gold from carbonaceous ore that contained 2.5% organic carbon. The optimum conditions for gold extraction were found to be 35°C and 103 kPa oxygen over pressure, pH 10.5, 3M NH3 with a lixiviant containing 0.71M (NH4)2S203, 0.15M CuSO4 and 0.1M (NH4)2SO3.

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Method for thiosulfate leaching of precious metal

What is claimed is: 1. A process for recovering a precious metal from a precious metal-containing material, comprising: (a) contacting the precious metal-containing material with a thiosulfate lixiviant at superatmospheric pressure in the substantial or complete absence of added ammonia to solubilize the precious metal and form a pregnant thiosulfate leach solution containing the solubilized

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Biooxidation‒thiosulfate leaching of refractory gold

Jul 21, 2019 A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

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Thiosulfate Leaching Process for Gold Extraction

He has focused the research for his PhD programme on Thiosulfate Leaching Process for Gold Extraction throughout the experiment and modelling work. During the PhD programme, he has worked on the gold thiosulfate leaching project for the extraction of gold at CSIRO Mineral, Western Australia.

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary raw material utilization in the production of gold are based on the use of cyanide (Hilson, 2006). In this method a weak sodium cyanide solution (NaCN) of 100-500 ppm is used. Since the Baia Mare

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diy ammonium thiosulfate gold leaching

Leaching of Gold. The chemistry associated with the leaching of gold with thiosulfate can be rather involved. Gold will dissolve in the presence of ammonium thiosulfate as follows. 4 Au + 8 S 2 O 3 2+ 2 H 2 O + O 2 = 4 Au(S 2 O 3) 2 3+ 4 OH Examination the E hpH diagram of the goldammoniathiosulfatewater system at 25 o C with [S 2 O 3 2] = 0.1 M [NH 3] = 0.1 M and [Au] = 105

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Leaching gold by reactive flow of ammonium thiosulfate

Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel (8 μm × 4 mm cross-section; 1:500). The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

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Dissolution of Silver and Gold with Sodium Hypochlorite

Apr 15, 2020 The present study examined a process for precious metal recovery (silver and gold) from difficult minerals which exhibit refractory characteristics to cyanidation and ammonium thiosulfate leaching (low extraction and high consumption of leaching agent). It is well known that mangano-argentiferous minerals are mainly composed of manganese, silver, gold, and iron. In this research, a mineral

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THIO LEACHING Gold Refining Forum

Apr 07, 2013 butcher Active Member Posts: 9679 Joined: January 6th, 2008, 7:09 pm Country of Origin: USA USA

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Leaching gold by reactive flow of ammonium thiosulfate

Here, we present a study of gold leaching, where the gold layer is removed from a microchannel wall within a high aspect ratio channel (8 μm × 4 mm cross-section; 1:500). The etchant is an aqueous solution of sodium thiosulfate, ammonium hydroxide, and copper sulfate.

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diy ammonium thiosulfate gold leaching

Leaching of Gold. The chemistry associated with the leaching of gold with thiosulfate can be rather involved. Gold will dissolve in the presence of ammonium thiosulfate as follows. 4 Au + 8 S 2 O 3 2+ 2 H 2 O + O 2 = 4 Au(S 2 O 3) 2 3+ 4 OH Examination the E hpH diagram of the goldammoniathiosulfatewater system at 25 o C with [S 2 O 3 2] = 0.1 M [NH 3] = 0.1 M and [Au] = 105

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Thiosulfate Leaching of Gold from Copper Bearing Ores

May 26, 2018 Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

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Thiosulfate Leaching Process for Gold Extraction

He has focused the research for his PhD programme on Thiosulfate Leaching Process for Gold Extraction throughout the experiment and modelling work. During the PhD programme, he has worked on the gold thiosulfate leaching project for the extraction of gold at CSIRO Mineral, Western Australia.

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Effect of additives on thiosulfate leaching of a gold ore

In a resin-in-leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min. Key words: Gold leaching, Thiosulfate, Additives, Leaching kinetics, Thiosulfate stability

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Thiosulfate-copper-ammonia leaching of pure gold and

Keywords: gold leaching, thiosulfate, quartz crystal microbalance Introduction The industrially applied leaching method for gold ores and concentrates involves the use of cyanide as a ligand for dissolution of gold. Cyanide is technically and economically a viable method for gold processing

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Thiosulphate Leaching SGS

Thiosulphate Leaching. Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported. We are a global technical leader in the field of thiosulfate leaching.

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Biooxidation‒thiosulfate leaching of refractory gold

Jul 21, 2019 A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (<10 μm) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

get price

US8597399B2 Method for thiosulfate leaching of precious

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary raw material utilization in the production of gold are based on the use of cyanide (Hilson, 2006). In this method a weak sodium cyanide solution (NaCN) of 100-500 ppm is used. Since the Baia Mare

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Minerals Free Full-Text Assessment of the Possibility

Jan 12, 2021 Research of noncyanide (thiosulfate) leaching of pure gold and concentrate of refractory gold-bearing oxidized ore in the autoclave was executed with the application of thiosulfate-copper and ammonium solutions. The reagent composition of the applied solution was as follows: 0.2 M Na 2 S 2 O 3, 0.6 M NH 3, 0.01 M CuSO 4, 0.4 M Na 2 SO 4. The

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THIOSULPHATE LEACHING FOR GOLD PRODUCTION JACOB

Jun 07, 2018 Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to

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The Extraction of Gold from E-waste by Hydrometallurgy

The effects of copper sulfate and ammonium thiosulfate [(NH 4) 2 S 2 O 3], the environment PH, and pulp mass were analyzed. 56.7 % of gold was extracted in suitable and optimal conditions, which are in 0.1 molar thiosulfate, 40 ml copper sulfate, and 8 hours time. Gold extraction efficiency of PCBs in the range of PH = 10-10.5 may be attributed

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SciELO Brasil GOLD RECOVERY FROM PRINTED CIRCUIT

From a literature review (leaching of gold ores, mostly), it was found that there are two research lines. Some authors worked with lower concentrations of thiosulfate and ammonium for a leaching time of 4 hours, whereas others worked with higher concentrations of thiosulfate and ammonium and a leaching time of 24 hours (O'Malley, 2002 O'Malley, G. P.; Recovery of Gold from Thiosulfate

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