The dissolution rate of gold in the oxide solution increases with increasing temperature and is maximum at around 85 °C. The relationship between the dissolution rate of gold and temperature is shown in the figure below. However, as the temperature increases, the oxygen content in the solution decreases and is zero at 100 °C. In this case, oxygen does not have the effect (in combination with hydrogenation) in the case of strong polarization.
When the temperature rises, it will also have an adverse effect on the gold cyanide leaching, such as increasing the chemical reaction speed of the base metal and cyanide, increasing the hydrolysis of the alkali metal and alkaline earth metal cyanide, thereby increasing the consumption of cyanide. .
Therefore, in the production of gold by cyanidation, in order to carry out the gold leaching process under better temperature conditions, the cyanide plant in different regions should be treated differently, so that the temperature of the leaching pulp is preferably kept at 10-20 °C.
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