Removal of undesirable metal ions in the concentration of dilute sulfuric acid solutions containing iron (ii) sulfate
CA 1100283 A · Owner: Kronos Titan G.M.B.H. · Inventors: Bramekamp, Karl-Jurgen; Kulling, Achim; Steinhausen, Helmut
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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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 5, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 1998.
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