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Patent US4723998 Recovery of gold from carbonaceous ores by

9 Feb 1988 e reacting said hypochlorite free aqueous ore slurry with a cyanide compound to further leach said gold from said ore f separating said nbsp

Chloride–hypochlorite oxidation and leaching of refractory sulfide

The effects of calcium hypochlorite concentration sodium chloride concentration AYLMORE M G 2005 Alternative lixiviants to cyanide for leaching gold ores nbsp

Chloride hypochlorite oxidation and leaching of refractory sulfide

concentrate using chloride–hypochlorite solution was investigated extracting gold from the refractory ores long leaching times more than 24 hours and

Leaching of an oxide gold ore with chloride hypochlorite solutions

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− nbsp

A Comparative Study of Cyanide and Chloride – Hypochlorite Gold

A Comparative Study of Cyanide and Chloride – Hypochlorite Gold Leaching of Oxide Ore from Placer Surigao Del Norte An Undergraduate Thesis Presented nbsp

Applicability of Case Based Reasoning for Selection of Cyanide

29 Sep 2016 Case based reasoning Gold leaching Cyanide free gold extraction M Leaching of an oxide gold ore with chloride hypochlorite solutions

The reasons of gold refractory Gold ore classification and

28 Nov 2016 The gold is fine grained or microscopic granular in the gold ore and it is surrounded and SCN therefore it affects the oxidation and the leaching of gold and make the gold 39 recovery easier generally we use hypochlorite nbsp

How to Leach Gold Ore With Chlorination Sciencing

25 Apr 2017 Place the gold ore in the cement mixer Pour in the hot water bleach and HCL The mixture should be 15 percent sodium hypochlorite and 33 nbsp

Leaching of Gold DocCopper

Leaching of Gold with Various Lixiviants or Complexing Agents with cyanide and its ineffectiveness in treating refractory ores and concentrates media are nitric acid aqua regia chlorine hypochlorous acid and hypochlorite acid

Patent EP2536860A1 Process for the recovery of gold from an ore

26 Dec 2012 the gold to be recovered ii leaching the ore in an oxidative chloride and also by alkaline chlorination hypochlorite but this generates a nbsp

Patent WO2013152424A1 Chloride process for the leaching of

17 Oct 2013 A process for the extraction of gold from a gold bearing ore or concentrate a leaching the gold bearing ore or concentrate with a lixiviant of hydrochloric An example of an alkali metal hypochlorite is sodium hypochlorite

‎ DOC ‎Thiourea Leaching of Gold Imperial Spiral Imperial College London

The most widely researched alternative lixiviants for gold ores are examined in this paper but it is MacArthur in the 1880s that the value of cyanide as a leach reagent for gold ore treatment was finally realized Hypochlorite chloride

Leaching of an oxide gold ore with chloride hypochlorite solutions

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− nbsp

Page 1 Iranian Journal of Materials Science amp Engineering Vol ll

according to equations 1 and 2 5 A fevv researchers have investigated the leaching of gold from an ore or a concentrate by chloride hypochlorite solution

Basement Chemistry for the Prospector Halide Leaching and

We will ignore fluorine because it does not dissolve gold Although I have no direct proof I 39 m sure that this was nothing more than sodium hypochlorite the stuff It was used by taking ore and chlorine and agitating them in a quot Pachuca Tank quot nbsp

Electrooxidation as a Pretreatment Process Before Cyanidation

1 Feb 2012 The poor extraction of refractory gold ores is an old and still existing problem pulp leach processing and can be applied to a small or large resource Chlorine and hypochlorite are not cheap and not fully used in oxidation nbsp

Patent US3639925 Recovery of gold from carbonaceous ores

8 Feb 1972 Carbonaceous gold ores are rendered amenable to a conventional cyanide process by pretreatment with sodium hypochlorite or calcium hypochlorite concerns an improved cyanide leach of these ores wherein the ore is nbsp

Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium

1 Jul 2013 Keywords Refractory Gold Concentrate Hypochlorite Oxidation Pretreatment Pressure Cyanidation 1 Such deposits are called refractory gold ores due to 60 gold recovery by direct cyanide leaching after fine grinding

hypochlorite leaching of gold ore 911 Metallurgist

HYPOCHLORITE LEACHING OF GOLD ORE W T Yen R A Pindred and M P Lam Mining Engineering Queen 39 s University Kingston Ontario Canada K7L 3N6

one step leaching of some refractory gold concentrate containing

arsenopyrite pyrite and gold with sodium hypochlorite in NaOH medium ing This kind of gold ore is a typically refractory ore Furthermore FeAsS and F652

Chloride as an Alternative to Cyanide SGS South Africa

concentrates provides an alternative to cyanide for gold ores The process generates Various options available to recover gold from PLATSOL® leach solutions are also discussed permanganate hypochlorite has to be used to obtain nbsp

Comparison of Cyanide and Chloride Hypochlorite Leaching of a

In this research cyanide and chloride–hypochlorite leaching of gold from a pyritic concentrate particle size −75 53 µm gold content 27 15 g t were compared

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