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由N235与路易斯碱三辛基氧膦(TOPO)组成协同萃取体系,对碱性氰化浸金贵液中金(I)协同萃取和反萃进行了研究.研究了有机相中N235含量、水相平衡pH、相比等因素对金(I)萃取率的影响,考察了反萃液中氢氧化钠液浓度对负载金有机相的反萃效果.结果表明,采用有机相为10%+10%协萃剂TOPO+80%煤油的协萃体系,对pH=9~10和初始金(I)质量浓度ρO=10.87 mg/L碱性氰化浸金贵液进行萃取时,经一级萃取后,萃取率可高达98%左右;同时,采用0.05~0.1 mol/L的氢氧化钠溶液可对负载有机相进行反萃,反萃率达到91%以上.
The synergistic extraction and back-extraction of gold (I) from alkaline cyanide leaching solution by N235 and Lewis base trioctylphosphine oxide (TOPO) were studied.The effects of N235 content, aqueous phase Equilibrium pH and other factors on the extraction rate of gold (I), the effect of sodium hydroxide concentration in the stripping solution on the stripping of the loaded gold organic phase was investigated.The results showed that using 10% + 10% The extraction of alkaline cyanidation leaching solution with pH = 9 ~ 10 and initial gold (I) concentration ρO = 10.87 mg / L was carried out by the extraction of TOPO + 80% The extraction rate can be as high as about 98%. At the same time, the loaded organic phase can be stripped with 0.05-0.1 mol / L sodium hydroxide solution, and the stripping rate can reach above 91%.