Cyanide Leaching

Ferrocyanides

The study and use of ferrocyanides was initiated with the discovery of the pigment “Prussian Blue” by Diesbach in 1704. Thus, they are among the earliest commercial chemicals and have been produced in large quantities for many years. In the United States, American Cyanamid Company, with its ample supplies of cyanides

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By | 2017-06-20T09:44:41+00:00 June 5th, 2017|Categories: Cyanide Leaching|Comments Off on Ferrocyanides

Batch Cyanidation Leach of Flotation Concentrate

grinding-flotation-batch-cyanidation

The production of gold bullion from gravity or flotation concentrates is often an important economic consideration for an isolated gold mining operation. It is assumed in this case that the coarse free gold has been recovered by the Mineral Jig in the grinding circuit and that the jig concentrate has been amalgamated. This treatment produces

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By | 2017-05-24T14:48:17+00:00 May 24th, 2017|Categories: Cyanide Leaching, Flowsheets & Flowcharts|Comments Off on Batch Cyanidation Leach of Flotation Concentrate

Cyanide Destruction Hypochlorite / Chlorine

In the Cyanide Destruction by Hypochlorite reaction, the pH has a strong inverse effect on the ORP. Thus, wastewater treatment facilities must closely control the pH to achieve consistent ORP control, especially if they use hypochlorite as the oxidizing agent. Adding hypochlorite raises the pH, which, if unchecked, lowers the ORP. calling for additional

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By | 2017-03-19T08:37:04+00:00 March 13th, 2017|Categories: Cyanide Leaching, Reagents and Chemicals|Comments Off on Cyanide Destruction Hypochlorite / Chlorine

Organic Carbon TOC Pre-Flotation & Preg‐Robbing of Gold

Organic carbon is a common problem for base metal production and precious metal leaching. In froth flotation, liberated organic carbon is naturally hydrophobic and will be recovered with the other minerals, lowering the grade of the concentrates. It can also adsorb collectors and frothers, reducing the efficiency of the mineral recovery

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By | 2017-03-17T19:13:59+00:00 November 5th, 2016|Categories: Cyanide Leaching|Comments Off on Organic Carbon TOC Pre-Flotation & Preg‐Robbing of Gold

Methods of Testing Cyanide Solutions

The method given above is difficult to apply when solutions containing soluble cyanides of zinc and other metals require to be titrated. “ A white flocculent precipitate occurs at a certain stage, probably consisting of simple (insoluble) cyanide of zinc, formed by decomposition of the soluble double cyanide:

K2ZnCy4

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By | 2017-03-18T10:12:28+00:00 November 2nd, 2016|Categories: Cyanide Leaching, Gold Extraction, Laboratory Procedures|Comments Off on Methods of Testing Cyanide Solutions

Potassium Cyanide Chemistry on Minerals & Metals

The ordinary gangue of most ores (silica and silicates of the alkalies and alkaline earths) exercises no direct influence on the cyanide solution. The carbonates of the alkaline earths are also probably without influence. The decomposing effects of sulphides of the heavy metals vary with the physical state of the sulphides.

Metallurgists found that

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By | 2017-03-18T10:16:50+00:00 November 2nd, 2016|Categories: Cyanide Leaching|Comments Off on Potassium Cyanide Chemistry on Minerals & Metals

Increase Potassium Cyanide Leaching Reaction with Gold & Mercury

These methods are described here for convenience, as being more intelligible after the chemistry of the process has been discussed. The necessity of the presence of oxygen has already been dwelt on above. It has, however, been frequently pointed out that in the interior of a mass of ore undergoing treatment the conditions are not favourable for the

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By | 2017-03-18T10:18:12+00:00 November 2nd, 2016|Categories: Cyanide Leaching|Comments Off on Increase Potassium Cyanide Leaching Reaction with Gold & Mercury

Oxidised Pyrite Leaching by Potassium Cyanide

When the pyrites occur in tailings which have been subjected to the action of the weather for some time before treatment, compounds are formed which are more prejudicial to the solution than the sulphides. Sulphide of iron, FeS2, is oxidised by air and water, ferrous sulphate and free sulphuric acid being formed, thus:

FeS2

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By | 2017-03-18T10:19:21+00:00 November 2nd, 2016|Categories: Cyanide Leaching|Comments Off on Oxidised Pyrite Leaching by Potassium Cyanide

Effect of Potassium Cyanide on Gold & Metals

The discovery that metallic gold is soluble in potassium cyanide came after studying the action of cyanides on plates of gold, and announced that they were slowly dissolved. Metallurgists pointed out that gold-leaf is dissolved by a dilute solution of the salt, and also showed that if the gold floats on the surface of the liquid, so that one side

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By | 2017-03-18T10:21:59+00:00 November 2nd, 2016|Categories: Cyanide Leaching|Comments Off on Effect of Potassium Cyanide on Gold & Metals

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