C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/116
C01B 17/88 (2006.01) C01B 17/90 (2006.01)
Patent
CA 1100283
REMOVAL OF UNDESIRABLE METAL IONS IN THE CONCENTRATION OF DILUTE SULFURIC ACID SOLUTIONS CONTAINING IRON(II) SULFATE ABSTRACT OF THE DISCLOSURE A process is described for the extensive removal of undesirable metal ions, especially chromium ions, in the reconcentration of dilute iron(II) sulfate containing sulfuric acid solutions by evaporating water and separating iron(II) sulfate wherein the dilute sulfuric acid solution is evaporated up to a content of 60 to 70% by weight H2SO4. According to the novel feature the dilute sulfuric acid solution or a preconcentrated sulfuric acid solution produced from it, without separation of metal salts, without simultaneous addition of clarified sulfuric acid or sulfuric acid solution is placed continuously into a receiver which contains a sulfuric acid metal salt suspension of which the liquid constituent contains 60 to 70% by weight H2SO4 and that at the same time so much water is evaporated that the sulfuric acid concentration in the liquid part of the metal salt suspension is maintained in the range of 60-70% by weight, and that continuously or at certain intervals a part of the sulfuric acid containing metal salt suspension is removed from the receiver and that the precipitated metal salts are separated. These solutions are used in the manufacture of titanium dioxide pigments.
274390
Bramekamp Karl-Jurgen
Kulling Achim
Steinhausen Helmut
Kirby Eades Gale Baker
Kronos Titan G.m.b.h.
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