Solvent extraction
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. Inflatable Toys High Frequency Welding Machine Inflatable Toys High Frequency Welding Machine is a high frequency device, whose self-exited oscillator of the electron tube can produce high frequency electromagnetic field. And the plastic to be processed is in the high frequency electromagnetic field between the upper and low electrode. When its interior molecules are polarized and produce heat automatically by mutual movement and friction, it will be welded with the pressure of the die. Mattress Making Machine,Inflatable Toys High Frequency Welding Machine,Pvc Air Mattress Making Machine,Life Jacket Making Machine Hangzhou Xiaoshan Wanfeng Mechanical & Electrical Equipment Factory , https://www.hfweldingmachinery.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.