Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1978-06-19
1980-08-05
Griffin, Ronald W.
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
423 53, C14C 306
Patent
active
042159890
ABSTRACT:
This disclosure is concerned with a tannery primary treatment process that, in total combination, or as separate sub-process features, enables the reducing of BOD loading in such treatment, while increasing the efficiency of hexavalent chrome recovery therefrom by separating out alkaline sulfide solids from the normal unhairing beamhouse stage and utilizing the same to attain appropriate sedimentation tank sludge pH for oxidation of the chrome to the hexavalent state during incineration; and/or increasing the hexavalent chrome recovery by backwetting and roasting the ash again; and/or enabling use of such ash for recycling as a chrome tanning liquor with the side-production of an improved flocculating chrome water wash for waste treatment use.
REFERENCES:
patent: 2766098 (1956-10-01), Perrin
patent: 3816095 (1974-06-01), Bruen et al.
patent: 3819799 (1974-06-01), Matschke et al.
patent: 3822993 (1974-07-01), Robinson et al.
patent: 3852059 (1974-12-01), Bruen et al.
patent: 3937785 (1976-02-01), Gancy et al.
patent: 3950131 (1976-04-01), Young
patent: 4086319 (1978-04-01), Jones
Griffin Ronald W.
Saco Tanning Division of Kirstein Leather Co.
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