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hypochlorite leaching of gold ore 6821

Hypochlorite Leaching of Gold Ore 911metallurgist

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

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Hypochlorite pretreatment in heap leaching of a low grade

The concept of hypochlorite treatment prior to cyanidation in the heap leaching of low grade carbonaceous gold ores is discussed. Laboratory column leach tests using a low grade carbonaceous ore were performed to investigate the effects of pH, hypochlorite consumption and concentration, and bed height on total gold extraction. At high pH, hypochlorite stability increases and thus, hypochlorite

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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 gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching

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A Comparative Study of Cyanide and Chloride

An oxide gold ore from Placer, Surigao Del Norte was subjected to chloride-hypochlorite and cyanide leaching at room temperature at 3 different hours 4 hours, 12 hours and 24 hours. This project characterized the ore used and assessed the effects

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Leaching of an oxide gold ore with chloride/hypochlorite

01/06/2007· 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

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Hypochlorite Leaching Of Gold Ores

Process For Recovery Of Gold From Gold Ores Using A . 1992-9-15process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching the ground ore is blended with an oxidizing agent such as calcium hypochlorite and then with a gold-complexing agenthe ore blend is slurried in water, the process can replace cyanide as the leaching agent for some gold

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Chloride–hypochlorite leaching of gold from a

01/06/2013· 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. The leaching rate of gold

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Hypochlorite Leaching Of Gold Ores veteranen

Hypochlorite Gold Leaching Equipment Biotoxyl. Gold leaching process south africa and indonesia gold leaching equipment in south africa samac gold leaching machine old get more a continuous cyclic process for production of calcium hypochlorite. click to chat; Leaching Gold Ore Trinivast. Leaching gold with a cyanide solution remains the most widely used

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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 24 hours. The reagent

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

Keywords: refractory gold ore, oxidative pre Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2. A part of the Au–Cl Pourbaix diagram in the [AuCl 4]¯ domain at [Au(III)] = 10–6 M, [Cl

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Hypochlorite Leaching Of Gold Ores veteranen

Hypochlorite Gold Leaching Equipment Biotoxyl. Gold leaching process south africa and indonesia gold leaching equipment in south africa samac gold leaching machine old get more a continuous cyclic process for production of calcium hypochlorite. click to chat; Leaching Gold Ore Trinivast. Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the

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thiosulfate leaching gold process 】

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. Inquire Now; thiosulfate leach of gold plateYouTube

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Leaching of an oxide gold ore with chloride/hypochlorite

01/06/2007· 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

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Sodium hypochlorite pretreatment for heap leaching

University of Nevada, Reno Login; Toggle navigation. View Item ScholarWorks University of Nevada, Reno

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Role Of Sodium Hypochlorite In Ore Beneficiation

sulfuric acid gold ore BINQ Mining. Apr 30 2013 26 Jun 2009 the ore has already been mined but much of the gold from the gold Eg sulfuric acid will dissolve copper Bleach is the chemical compound sodium hypochlorite When combined with hydrochloric acid the mixture produces chlorine that dissolves gold from gold ore

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Chlorination Of Refractory Ore

Sep 01, 1990· Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL

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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. This

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

In the QCM tests the chloride-hypochlorite alternative showed highest 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

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Flexicone technology for sulfide ores flexicone

Chloride-hypochlorite technology of leaching of gold from ores and concentrates. We have developed a chloride-hypochlorite technology for leaching gold in an alkaline medium with a pH of 8-8.5. This technology makes it possible to operate the system under less corrosive conditions with a lower chloride concentration and can be used as an alternative to cyanide. To activate the process of

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Halide Leaching Recreational Gold Prospecting

Leaching O.K., I hate to try to explain the principle of oxidation/reduction or “redox” because I have never been able to put it into words that anyone can understand. But, we have to try to get at least a rudimentary understanding of this or you will never really understand what is going on in gold extraction or any form of metallurgy. There are three ways to look at redox. Oxidation is:

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