Solvent Extraction of Mo and W with 0.01 M Alamine 336

The extraction and stripping of Mo (VI) and W (VI) with a tertiary amine, Alamine 336 were chiefly studied and these characteristics of pH, diluent, extraction temperature, rate of extraction, maximum loading capacity and stripping were clarified. At the extraction of Mo.the third phase was formed below pH 2.8 with the kerosene diluent but the extraction rate of about 99% was obtained.When the dihlent of Alamine 336 was C6H6 and CCl4.the extraction rate of Mo was about 75% at pH 2.4. The extraction rate of W was 97% at pH2.3 with the kerosene diluent and at below these pH the third phase was formed.When the diluent of Alamine 336 was C6H6 and CCl4, the extraction rate of W was about 70 and 60% at pH2.3, respectively, and the formation of third phase was observed at below this pH.As the results of investigating these data, the kerosene was chosen as the diluent on the extraction of Mo and W.The species that take part in the reaction were mainly MoO2-4, Mo7O6-24, Mo8O4-26, WO2-4, H2W6O3-21 and H2W12O10-42.In order to prevent the formation of third phase, it was necessary to add 0.3ml of decanol in 15mlα of the organic phase on Mo extraction and 1mα of decanol in 15ml of the organic phase on W extraction.Stripping of Mo and W from A lamine 336 were about 80 to 85% at pH greater than 10 with 0.1M (NH4) 2SO4 solution and about 85 to 98% at pH greater than 9.5 with 0.1M (NH4) 2CO3 solution, respectively.Recovery of Mo and W from the solution which was not coexisted of those two species were possible by the selection of optimum pH and stripping reagent.