The method of extracting and recovering gold from an alkaline cyanide solution using an organic extractant is called solvent extraction to extract gold. 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. Hot Oil Laminating Machine,Hot Oil Roller Laminating Machine,Hot Oil Roller Press Laminating Machine,Hot Oil Laminating Making Machine Laizhou Jinlida Machinery Co.,Ltd , https://www.jldepe.com
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:
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.