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  • Hypochlorite Leaching of Gold Ore

    The reactions between gold and hypochlorite leach solutions containing hydrochloric acid and sodium chloride are demonstrated below: 4Au + 16NaOCl + 10H2O → 4HAuCl4

  • Advances in Gold and Silver Processing

    HYPOCHLORITE LEACHING OF GOLD ORE 7 1 Free Milling Gold Ore The free milling gold ore used in this study contains sulphide minerals, such as chalcopyrite and pyrite. Conventional cyanidation resulted in 95 % of the gold being extracted under strong leaching conditions, i.e., a grind of 90 % minus 200 mesh, leach with 1 g5 NaCN at pH 11.0 for

  • Leaching of an oxide gold ore with chloride/hypochlorite

    Jun 01, 2007· An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice

  • Leaching of an oxide gold ore with chloride/hypochlorite

    An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on

  • Simultaneous sulfide oxidation and gold leaching of a

    Sep 01, 2013· Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution was used for a refractory sulfide concentrate containing 20.45 g/t gold. Leaching tests at different concentrations of Ca(OCl) 2 and NaCl, and also various initial pHs were performed.

  • Gold Leaching from a Refractory Gold Concentrate by the

    Mehdi Ghobeiti Hasab, Fereshteh Rashchi, Shahram Raygan. “Simultaneous sulfide oxidation and gold leaching of a refractory gold concentrate by chloride–hypochlorite solution,” Minerals Engineering, 2013. 50–51: 140–142 CrossRef Google Scholar

  • (PDF) The Leaching of Gold-silver from Refractory Gold

    The leaching rate of gold was 75% at 1.5:1 ratio of chlorine and hypochlorite and increased to 81% with adding 1 M NaCl. However, at 1% pulp density and at,the leaching rates of Au were close to

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

    Gold is an almost non-reactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it. Chlorine is the cheapest and lightest product that can achieve this. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore.

  • Flexicone technology for sulfide ores flexicone

    If further leaching of gold by cyanidation or the chloride-hypochlorite method is assumed, then the process is carried out in a relatively neutral medium: at a pulp pH above 4.0. For the neutralization resulting from the oxidation of the reactions (1) and (4) of sulfuric acid, the cheapest reagent is used — limestone and / or soda.

  • 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 ores at low cyanide

  • (PDF) The Leaching of Gold-silver from Refractory Gold

    The leaching rate of gold was 75% at 1.5:1 ratio of chlorine and hypochlorite and increased to 81% with adding 1 M NaCl. However, at 1% pulp density and at,the leaching rates of Au were close to

  • Gold Extraction Method Replaces Cyanide With Non-Hazardous

    Apr 30, 2018· Using gold concentrate provided by its partner in Chile, DST was able to evaluate the effectiveness of its technology in a live setting. The company requested proposals from a number of suppliers for onsite sodium hypochlorite generation (OSHG) systems to produce the hypochlorite that is critical to the process.

  • Gold Leaching from a Refractory Gold Concentrate by the

    Mehdi Ghobeiti Hasab, Fereshteh Rashchi, Shahram Raygan. “Simultaneous sulfide oxidation and gold leaching of a refractory gold concentrate by chloride–hypochlorite solution,” Minerals Engineering, 2013. 50–51: 140–142 CrossRef Google Scholar

  • 10.1016/j.hydromet.2013.06.013 DeepDyve

    Jun 11, 2020· Gold extraction was 100% with 45 min milling (air atmosphere, rotating speed = 300 rpm, sample/ball weight ratio = 1 / 20) and then 30 min leaching in the chloride–hypochlorite solution (100 g/L NaCl, 250 g/L Ca(OCl) 2,S / L = 1 / 20, 25 °C and 600 rpm), while for the un-milled sample, recovery of gold was only 37.2% after 480 min leaching.

  • Leaching of Gold

    Several systems using chloride, hypochlorite, and/or ferric chloride have been devised for heap and in situ leaching of gold. These processes claim to generate less cost due to lower reagent consumption particularly in ores with cyanide-soluble copper, less environmental impact, and faster dissolution.

  • Hypochlorite Gold Leaching Equipment

    Hypochlorite Leaching of Gold OreThe reactions between gold and hypochlorite leach solutions containing hydrochloric acid and sodium chloride are demonstrated b. 27 Division, mirpur-12, pallbi. Email: [email protected] Careers; Help Desk; Login; 24/7 Phone Services 555 666 99

  • 4 Reasons and Solutions of Poor Gold Leaching Effect

    Therefore, during cyanide leaching process, it is difficult for the cyanide solution to contact with gold mineral, so the gold leaching rate is often low. Solution After reaching a certain degree of monomer dissociation, for gold ores with low arsenic content, aqueous solution oxidation, aqueous chlorination, bacterial oxidation, etc. can be used.

  • DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

    queries. The aim of this paper is to study leaching of gold with cyanide replacing alternatives such as ammonium thiosulfate, chloride-hypochlorite, thiourea and thiocyanate to provide new cases for the tool. The behaviour of gold was examined with electrochemical tests and weight loss measurements a using

  • 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 ores at low cyanide

  • Sustainable technique recovers gold from e-waste cheaply

    Questions about muriatic acid and hypochlorite sodium. Dec 10, 2020. Amino acids key to new gold leaching process. Oct 24, 2014. Cleaning up the precious metals industry. Oct 28, 2015.

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