The method of extracting and recovering gold from an alkaline cyanide solution using an organic extractant is called solvent extraction to extract gold.
Has been developed with an alkyl phosphate, such as tributyl phosphate (TBP) and dibutyl butyl phosphonate (DBBP) as the extractant, at pH = cyanide ion is selectively extracted 9:00 Gold is extracted as an ion pair, ie, M + ... AuCN 2 - , and its reaction formula is:
M + +Au ( CN ) 2 - +mRPO+nH 2 O → M + ...... Au ( CN ) 2 - · mRPO · nH 2 O
Wherein M + is a cation, i.e., K + , Na + ..., and RPO is an alkyl phosphate. Water can be used to keep the extracted ion pairs in a hydrated state.
From Alkaline Cyanide gold extraction solution suitable for a wide range of gold concentrations (10 ~ 10000 ppm), and TBP pure DBBP final extraction capacity is great, the extraction of gold is of up to 95 to 97.7%, silver was extracted The rate is about 50%, while the extraction rate of other base metals is only 10% or less. It can be seen that the alkyl phosphate has obvious selective characteristics for gold extraction.
A method of recovering gold from an alkyl phosphate can be carried out by direct electrolytic deposition.
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