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 gold recovery process is disclosed in which the gold content of ores, including carbonaceous ores or mixtures of carbonaceous and oxide ores, is extracted by a simultaneous chlorine leach and ion exchange resin adsorption procedure. The process eliminates or reduces the degree of oxygenation and cyanidation required to conduct a standard gold extraction process.

Dec 10, 2010. #4. The ratio is irrelevant. Start with enough Hcl to absorb the volume of gold,then add NaOCl in small amounts and give it time to work in between additions.The Hcl is only there to digest the gold (creating the auric chloride)when it has been oxidized using the NaOCl. If you can not find SMB you can use copperas (FeSO4, iron (ii ...

Leaching of an oxide gold ore with chloride/hypochlorite solutions ... Chlorine had been used to dissolve gold from ores and concentrates, during the second half of the 19th ... Plexiglas stirred tank vessel. A simple drawing of the setup is shown in Fig. 1. A turbine-type Teflon impeller was used for agitation. A large port on the lid was

Leaching of an oxide gold ore with chloride/hypochlorite solutions. Download. Related Papers. A Comparative Study of Cyanide and Chloride – Hypochlorite Gold Leaching of Oxide Ore from Placer, Surigao Del Norte. By Renee Alexis Taladua. Application of Alternative Lixiviants for Secondary Heap Leaching of Gold.

The chlorination method is one of the ways to leach gold into a soluble gold chlorine complex from an aqueous chloride solution such as sodium chloride. In general, the chlorinating agent is chlorine gas or hypochlorite. The leaching reaction is as follows: (5) 2 Au + 3 Cl 2 + 2 Cl − = 2 Au Cl 4 − (6) 2 Au + 3 Cl O − + 6 H + + 5 Cl − ...

Chlorine gas was bubbled in through four pipes submerged 5 ft into the tank. Chlorine was added over an 8-hr period at the rate of 3,5 lb per ton per hr initially, and decreased to 1.5 lb per ton per hr over the last 2.5 hr. Gold extractions of 89 pct (0.035 oz gold per ton tails) were obtained using 38 lb chlorine …

More than a century ago, gold ores were treated by roasting and subsequent leaching with aqueous solution of chlorine. Ross (1902) reported that chlorine consumption was 3 - 10 kilograms per tonne of ore and the gold extraction was 90 - 98 per cent MacArthur and Forrest introduced the cyanidation process in 1887. Cyanide

Cyanide-free mild chloride leaching was investigated. •. Gold could be recovered even at <520 mV vs. Ag/AgCl in carbon-in-chloride-leach mode. •. Copper was a stronger oxidant than iron in gold leaching. •. Gold was oxidized by in-situ dissolving impurities. •. Seawater contains enough chlorides to dissolve gold.

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90°C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...

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Check out Action Mining's System III leaching unit for ideas. Sounds like what you are building. Here's a PDF with their instructions...

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, …