EXTRACTION OF GOLD FROM AQUEOUS-SOLUTION BY CARRIER-MEDIATED PROCESS USING KRYPTOFIX-22 DD

Reactive extraction of gold from alkaline aqueous cyanide solution int o n-decanol in the presence of Kryptofix 22 DD as complexing agent was studied using a stirred transfer cell. The study investigated the eff ects of carrier concentration and temperature on mass transfer rates. A two-film model was proposed by considering film mass transfer resist ances at the aqueous and organic phases. The model predicted adequatel y the experimental time-concentration data at different carrier concen trations and temperatures. Experiments have also been carried out to e xtract gold in an emulsion system using the same carrier and a mixed s olvent of kerosene and decanol.