The role of extractant components in the synergic extraction of Ge with LIX 63/0PAP.
Penner-LR; Russell-JH; Campbell-MJ
Solvent Extraction in the Process Industries: ISEC 93. Logsdail DH, Slater MJ, eds. New York: Elsevier Applied Science, 1993 Sep; 3:1391-1398
Extraction of Ge from sulfuric acid solution was studied for the synergic extractant pair 5,8-diethyl-7-hydroxy-6-dodecanone oxime (LIX 63) and octylphenyl acid phosphate (OP AP). These studies were undertaken by the U.S. Bureau of Mines to enhance selective extraction of metals by determining mechanisms of synergic extraction. In equilibrium shakeout tests, Ge extraction was measured for LIX 63 with each of the two components of OP AP-monoalkyl (MOPP A) and dialkyl (DOPPA)--in the presence of a modifier, isodecanol, in isooctane diluent. Mechanistic models are proposed for each of the two systems. The fit of the assumed models to the data is consistent with the conclusion that extraction synergy results from the formation of several mixed extractant complexes. In both systems, Ge extraction increases with increasing sulfuric acid concentration. MOPPA generally is a stronger Ge extraction synergist than DOPP A, but MOPPA experiences higher solubility losses to the aqueous phase.
Solvent extraction; Synergism
Paper in Solvent Extraction in the Process Industries, V.