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MODELING OF GOLD CYANIDATION

LAPPEENRANTA UNIVERSITY OF TECHNOLOGY Faculty of Technology Degree Programme of Chemical and Process Engineering MODELING OF GOLD CYANIDATION by Waroonkarn Srithammavut

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gold cyanidation - wikipedia. gold cyanidation is a hydrometallurgical technique for extracting gold from low-grade ore by in this redox process oxygen removes via a two-step reaction one electron from each gold atom to form the complex au cn 2 ion

Gold cyanidation - Wikipedia

In this redox process, oxygen removes, ... Despite being used in 90% of gold production: gold cyanidation is controversial due to the toxic nature of cyanide.

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Gold extraction info(Cyanide) Chemistry redox assignment ...

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Sodium thiosulfate is a component of an alternative lixiviant to cyanide for extraction of gold to form a strong soluble complex $\ce{[Au(S2O3)2]^{3−}}$. The advantage of this approach is that thiosulfate is essentially not toxic and that ore types that are refractory to gold cyanidation (e.g. carbonaceous or Carlin-type ores) can be leached by thiosulfate.

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Gold Oxidation States - Mineral Processing & Metallurgy

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Selected leaching results Unlike gold cyanidation, thiosulfate leaching involves relatively high concentrations of reagents, while the gold extraction is

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Effect of Oxygen on Gold Leaching

In simplified terms, the Effect of Oxygen on Gold Leaching can be summarized in saying: The dissolution rate of gold in alkaline cyanide solutions under atmospheric conditions, and at practical cyanide levels, is directly proportional to the dissolved oxygen concentration.

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The process of extracting gold from ore with cyanide is called cyanidation. The reaction, known as Elsner's Equation, is: 4 Au + 8 CN-+ O 2 + 2 H 2 O = 4 Au(CN) 2-+ 4 OH-Although the affinity of cyanide for gold is such that it is extracted preferentially, cyanide will also form complexes with other metals from the ore, including copper, iron and zinc.

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A redox flow lithium battery (RFLB) has decoupled energy storage and power generation units like a conventional redox flow battery, while it stores energy in solid materials by virtue of the unique redox targeting concept.

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