Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1976-11-08
1978-04-25
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
4232105, 423597, 423607, 8 9427, C01G 3702, C01G 3714
Patent
active
040863190
ABSTRACT:
A process is disclosed for incinerating tannery waste solids containing organic material and chromium which comprises burning at least one ton per day of said waste in the combustion zone of an industrial furnace at a low temperature, preferably between about 800.degree. F. and 1200.degree. F., to convert at least a portion of the organic material to gases and the chromium to ash, removing the gases from the combustion zone and subjecting them to further oxidation, and removing the ash from the furnace. The waste solids include sludge separated from liquid waste, leather scrap, or preferably both. By controlling temperature, waste composition, or both, the chromium in the ash can be obtained in either trivalent or hexavalent form. The hexavalent chromium can be extracted with solvent for reuse in the tanning process. Trivalent chromium, with or without carbon, can be recovered as chromic oxide in an improved stable form for landfill, storage or shipment to a reprocessing center.
REFERENCES:
patent: 3647358 (1972-03-01), Greenberg
patent: 3950131 (1976-04-01), Young
"Standard Method of Test for Total Ash in Leather" A.S.T.M. D2617-D2669 (1969).
"Standard Method of Test for Chromic Oxide in Leather" A.S.T.M. D2807-D2872 (1972).
Hauck, "Report on Methods of Chromium Recovery & Reuse from Spent Chrome Tan Liquor," J. Am. Leather Chemists Assoc., vol. 67, No. 10 (1972), pp. 422-430.
"Process Design Manual for Sludge Treatment & Disposal" U.S.E.P.A. 625/1-74-006, Oct. 1974, pp. iii, 8-6, 8-17, 8-24, 8-35.
Hearn Brian E.
Vertiz O. R.
LandOfFree
Recovery of chromium from tannery waste does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Recovery of chromium from tannery waste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recovery of chromium from tannery waste will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2420415