ore dressing hydrogen cyanide on gold dissolution

  • Low pH cyanidation of gold ScienceDirect

    Dissolution was directly proportional to the concentration of the cyanide ion present with the contribution to dissolution from aqueous hydrogen cyanide too low to be measured. Ore leached in high magnesium hypersaline process water showed increased gold dissolution at low pH compared to the pure gold.

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  • Gold cyanidation

    Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination complex. It is the most commonly used leaching process for gold extraction.

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  • Dissolve Gold and Silver with Cyanide

    High pH or protective alkalinity to prevent the generation of lethal hydrogen cyanide gas. Sufficient time for the cyanide and oxygen to react with the gold and silver. Since cyanide reacts with the gold and silver it is consumed during leaching. The cyanide can and will also react with other undesirable metals and is essentially wasted.

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  • The Metallurgy of Cyanide Gold Leaching An Introduction

    Liberation Cyanide leaching will only be effective if the cyanide can come in contact with the gold particle. For this to happen the ore should either be sufficiently porous for cyanide to reach the gold or more usually the ore is crushed and ground to a size at which the surface of the gold is exposed i.e. the gold is liberated.

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  • Cyanide Gold Dissolution Mineral Processing Metallurgy

    The chemical consumption of cyanide for a given ore depends on the cyanideconsuming constituents present in the ore the period of treatment and the strength of solutions. The mechanical loss of cyanide depends on the type of treatment employed. For gold ores the total cyanide consumption will average around 1½ lb. NaCN per ton ore.

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  • cyanide process in gold ore dressing extraction

    cyanide process in gold ore dressing extraction Lime and sodium cyanide are used in the dissolution of gold and. Live Chat Technical Resource Document Extraction and Beneficiation of Ores . processing cyanide and gold ore. The U.S. Bureau of Mines first proposed heap leaching with cyanide in 1969 as a means of extracting gold from ores

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  • Cyanide Leaching Of Gold

    The gold particle size has a tremendous effect on the time required for dissolution in a cyanide solution. Generally the finer the gold the quicker it will dissolve. A 45 micron particle of gold would dissolve in 1013 hours while a 150 micron particle might take from 20 to

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  • Use in Mining International Cyanide Management Code

    The cyanide then dissolves gold and silver from the ore and forms a stable metalcyanide complex. The use of oxygen or peroxygen compounds instead of air as an oxidant increases the leach rate and decreases cyanide consumption due to the inactivation of some of the cyanide consuming species present in the slurry.

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