Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1980-05-01
1982-07-20
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
8 9427, C01G 3700, C01G 3708
Patent
active
043405711
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: 3896209 (1975-07-01), Founier et al.
patent: 4086319 (1978-04-01), Jones
patent: 4215989 (1980-08-01), Cartier
Carter Herbert T.
Saco Tanning Division of Kirstein Leather Co.
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