Novel dissolution procedure using a mixture of manganese dioxide and hydrochloric acid for the matrix-independent determination of gold

Chattopadhyay, Partha; Mistry, M.

doi:10.1007/s002160050158

Cited by 3 publications

(1 citation statement)

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“…Despite the fact that this method was already applied for the dissolution of gold for analytical purposes, 13 it was never investigated nor mentioned for the metallurgical extraction of gold from ores or precious metal scrap. For all of these reasons, if this technique is successful, it would offer numerous advantages over existing processes.…”

Section: Methodsmentioning

confidence: 99%

A method for leaching or dissolving gold from ores or precious metal scrap

Geoffroy

Cardarelli

2005

JOM

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The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the environment. However, even if several other reagents are known to dissolve gold at the laboratory scale, none of these are used industrially. Hot mixtures of hydrochloric acid with strong oxidizing compounds are known to generate in-situ nascent chlorine which is capable of dissolving gold effi ciently. In this study, the authors investigated the capability of a hot mixture of hydrochloric acid and ground manganese (IV) oxide to dissolve gold metal either under atmospheric or pressurized conditions. The best result was obtained under a pressure of 639 kPa at 90°C with a dissolution rate of 0.250 g·cm -2 h -1 and it was compared to that reported in the literature for other industrial reagents.

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Section: Methodsmentioning

confidence: 99%