Method for regenerating pickling acids

Details Method for regenerating pickling acids Method for regenerating pickling acids

C - Chemistry, Metallurgy

23

G

149/21

C23G 1/36 (2006.01) C01G 37/02 (2006.01) C01G 49/00 (2006.01)

Patent

CA 1214382

METHOD FOR REGENERATING PICKLING ACIDS Abstract of Disclosure The residual acid mixture containing metals which has been produced in the steel pickling process is regenerated to become new HF/HNO3 pickling acid by applying H2SO4 addition and evaporation. The metal sulphate salt produced in evaporation is converted into scarcely soluble iron jarosite Na[Fe3(SO4)2(OH)6] and chrome and nickel hydroxide, the last mentioned metal hydroxide being obtained as a separately utilizable precipitate. The metal sulphate salt is separated from 60% H2SO4 solution, wherein the main part of the salt is also crystallized. For promoting the crystallization, part of the salt is crystallized in a side line where 80% H2SO4 concentration is used. The acid slurry produced is carried back to the crystallizing stage in the main line.

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