amount of chlorine required in gold leaching

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The Metallurgy of Cyanide Gold Leaching – An Introduction – Core Group

Nature of Gold: The surface of a gold particle will typically be dissolved at a rate of around 0.2-0.5 µm of surface depth per hour in a cyanide

US4941917A - Process for recovery of precious metals from carbonaceous

239000010931 gold Substances 0.000 claims abstract description 71 Process for recovery of precious metals from carbonaceous ores using chlorine dioxide AS

WO2014155753A1 - Method for pretreatment of gold ore - Google Patents

Provided is a method for pretreatment of gold ore in order to

PREG-ROBBING OF GOLD IN CHLORIDE-BROMIDE SOLUTION

decreased gold recovery from 92 to 70% and addition 5% w/w of carbon decreased gold recovery to almost zero. Keywords: gold leaching pre-robbing hydrometallurgy carbon Introduction In the mid to late 1800s there were several gold leaching processes using chlorine as an oxidizing agent.

Bromine leaching as an alternative method for gold dissolution

This leaching process has several advantages: it uses a gaseous mixture of chlorine and bromine that is generated in-situ by introducing hypohalides in the reactor itself; the capability of chlorine to oxide bromides implies that a low concentration of bromide is required in the leaching solution; gold is simultaneously

Research on The

Roasting and chlorine leaching of gold-bearing refractory concentrate

When Cl 2 has been consumed as a consequence of reaction the yellow coloration disappears and an additional amount of chlorine must be added in order to allow further oxidant leaching. 1 Points 3 and 4 have to be repeated 4 or 5 times until the red coloration is definitively permanent: this indi es the end of the leaching.

New Eco-Friendly Non-Cyanide Based Alternative for Gold Extraction

No off-gas or detox controls required; thiocyanate ammonia bromine chlorine bisulfites thiourea and others. The EnviroLeach reagent is ideally suited for the leaching of gold in an

JP2009046736A - Chlorine leaching method of nickel sulfide - Google Patents

A method for leaching chlorine in a chloride aqueous solution containing copper ions using nickel sulfide produced by a hydrometallurgical method of nickel oxide ore comprising the following steps 1 to 4 : It is characterized by including.

Cyanide-free gold leaching in exceptionally mild chloride solutions

In the leaching experiments gold leaching in “typical” aggressive chloride leaching media was compared against less aggressive chloride solutions. Leaching experiments Table 3 in chloride-bromide media tests 1–8 and in chloride media without bromide addition tests 9–19 were carried out at Outotec Research Center Pori Finland.

Chlorine leaching of gold-bearing sulphide concentrate and its calcine

The extraction of gold was increased by about 3-4% after addition of the chloride in the chlorine

Advances in Gold and Silver Processing

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

PDF Alternatives to cyanide in the gold mining industry: What

replaced gold leaching agents such as chlorine in the first place. As La Broo y 31 explains halide systems are currently limited to analytical appli ions where the capacity

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amount of chlorine required in gold leaching