Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1984-01-23
1985-07-02
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
134 13, 134 41, 156345, 156664, C23F 100, B44C 122, C03C 1500, C03C 2506
Patent
active
045266506
ABSTRACT:
The residual acid mixture containing metals which has been produced in the steel pickling process is regenerated to become new HF/HNO.sub.3 pickling acid by applying H.sub.2 SO.sub.4 addition and evaporation. The metal sulphate salt produced in evaporation is converted into scarcely soluble iron jarosite Na[Fe.sub.3 (SO.sub.4).sub.2 (OH).sub.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% H.sub.2 SO.sub.4 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% H.sub.2 SO.sub.4 concentration is used. The acid slurry produced is carried back to the crystallizing stage in the main line.
REFERENCES:
patent: 3840646 (1974-10-01), Sugimoto et al.
patent: 4255407 (1981-03-01), Puurunen
Blomquist Seppo I.
Fugleberg Sigmund P.
Koivunen Timo T.
Lindroos Kaj-Henrik
Nyman Bror G.
Outokumpu Oy
Powell William A.
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