3RD PHASE-FORMATION IN EXTRACTION OF THORIUM NITRATE BY MIXTURES OF TRIALKYL PHOSPHATES

This paper reports the results of the studies on third phase formation during the extraction of thorium nitrate from zero free acidity solut ions by mixtures of trialkyl phosphates. The phosphates used are tri n -butyl phosphate(TBP), triiso butyl phosphate(TiBP), tri sec butyl pho sphate (TsBP) and tri n-amyl phosphate(TAP). The results indicate that small additions of a homologous phosphate can alter the Limiting Orga nic Concentration (LOC) above which the third phase formation takes pl ace and thus can be advantageously utilised. Use of mixtures of the tr ialkyl phosphates as extractant can thus obviate the need for adding m odifiers such as alcohols to the organic phase for avoiding third phas e formation.