Process for the removal of undesirable metal ions, especially va

Details Process for the removal of undesirable metal ions, especially va Process for the removal of undesirable metal ions, especially va

1984-08-17

1990-01-02

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423 66, 423 67, 423 83, 423146, 423DIG2, C01B 1790, C01G, C01G, C01G 7704, C01G 4914

Patent

active

048912069

ABSTRACT:
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 H.sub.2 SO.sub.4. 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/l. The trivalent titanium may be added from the outside, if not already present in an adequate amount in the solution, 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 preconcentration and cooling of the preconcentrated sulfuric acid solution.

REFERENCES:
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patent: 2905530 (1959-09-01), Gregoire
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patent: 3236596 (1966-02-01), Zirngibl
patent: 3416885 (1968-12-01), Honchar
patent: 3533742 (1970-10-01), Oster
patent: 4288415 (1981-09-01), Rahm et al.

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