Extraction and separation of Ti(IV) using thiophosphinic acids and its recovery from ilmenite and red mud

This paper embodies details on the extraction behavior of Ti(TV) along with Mg(II), Mn(II), Fe(III), Al(III), Ce(IV), and V(V) from hydrochloric acid medium employing mono- and di-sulphur analogues of bis-(2,4,4-trimethylpent yl) phosphinic acid, namely bis-(2,4,4-trimethylpentyl)monothiophosphinic a cid (Cyanex 302) and bis-(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyan ex 301). The effect of various parameters, such as the concentration of the acid, metal ion, and extractant, and the nature of the diluent on the extr action of Ti(TV) has been investigated. Almost quantitative extraction of T i(TV) is observed in both the extractants in the 1x10(-2) to 0.5 M acidity range. The extractants can hold the metal ion up to one-tenth of its molar concentration. The extracting species is proposed to be Ti(OH)(2) R-2, (HR = Cyanex 301/Cyanex 302). The partition data have been utilized for obtaini ng some binary separations of Ti(IV) from some commonly associated metal io ns. The practical utility of the extractant has been demonstrated by recove ring Ti(IV) from ilmenite and red mud.