Patent ID: 7700057

Claim:
A method for the industrial purification of a titanium feed stream of purity P1, by the formation of a titanium-double-salt precipitate of purity P2 and a titanium solution with purity P3, wherein P2>P1>P3, said method comprising the steps of: i. forming, from said feed, a medium comprising water, titanium ion, a cation selected from the group consisting of ammonium, cations of alkali metals, protons and a combination thereof, and an anion selected from the group consisting of OH, SO 4 , HSO 4 and a combination thereof, which formed medium is further characterized by the presence of (a) a double-salt precipitate comprising titanium ion, at least one of said cations and at least one of said anions; and (b) a titanium solution; and wherein the concentration of said anion in said titanium solution is higher than 15 wt % and the ratio between the concentrations of said cation and said anion in said titanium solution is higher than 0.4 and lower than 1.6; and ii. separating a least a portion of said precipitate from said solution.