C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/84
C01B 17/88 (2006.01) C01B 17/90 (2006.01) C01B 17/96 (2006.01) C01G 23/053 (2006.01) C01G 49/14 (2006.01)
Patent
CA 1266553
-13- ABSTRACT OF THE DISCLOSURE A process for the extensive removal of undesirable metal ions, particularly vanadium ions, in the course of the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions. The sulfuric acid solutions are concentrated by the evaporation of water and the separation of iron(II) sulfate to a content of 60 to 70% by weight H2SO4. According to the invention, the content of trivalent titanium in the solution is adjusted such that the content of trivalent iron does not exceed 0.1 g/1. The trivalent titanium may be added from the outside, if not already present in an adequate amount in the solu- tion, or may be formed in situ from the tetravalent titanium present in the solution by the addition of a reducing agent. Prior to the final concentration, part of the iron may be precipitated and separated as iron(II) sulfate heptahydrate by means of preconcentra- tion and cooling of the preconcentrated sulfuric acid solution.
461183
Kulling Achim M.
Steinhausen Helmut H.
Kirby Eades Gale Baker
Kronos Titan-Gmbh
Kulling Achim M.
Steinhausen Helmut H.
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