Method for sludge treatment

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

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159 11R, 159 12, 159 49, 159DIG6, 210 71, 210 73R, 210152, 210259, 210294, C02C 506

Patent

active

039607259

ABSTRACT:
Sludge containing metal hydroxide is first subject to a separation treatment where solid particles are removed, and then dewatered to obtain a greater concentration of the metal hydroxide. The dewatered sludge attains a thixotropic character whereupon it is applied to a carrier in a film-like manner. The film is heated and then sintered so as to achieve a metal oxide that is harmless and easily handable. The separation and dewatering steps of the process are carried out in a first apparatus having a suction drum surrounded by a filtering cloth that removes the water contained in the sludge and transfers it to a second apparatus having a rotating carrier for receiving on the circumference thereof the metal hydroxide in a film form, whereupon the film is heated during rotation of the carrier and sent to a sintering apparatus for conversion to a metal oxide in a granular or powder form.

REFERENCES:
patent: 2096176 (1937-10-01), Harrington
patent: 2413420 (1946-12-01), Stephanoff
patent: 2487600 (1949-11-01), Schneiderworth
patent: 2542743 (1951-02-01), Weymouth
patent: 2559441 (1951-07-01), Judd
patent: 2570532 (1951-10-01), Eisenberg et al.
patent: 3163598 (1964-12-01), Yoshihara et al.
patent: 3395221 (1968-07-01), Snyder et al.
patent: 3559807 (1971-02-01), Reilly
patent: 3575854 (1971-04-01), Richards

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