Question

Difference between acid leaching and alkaline leaching

Answer 1

Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about pH 1.5.


Alkaline leaching is The process of dissolving soluble minerals from a solid ore or concentrate by means of an alkaline solvent. E.g. Sodium hydroxide is used for dissolving aluminium from bauxite and leaching wolframite and scheelite ores. Ammonium hydroxide is used for extracting metals such as copper and nickel that form soluble ammines from their ores.
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