Method for sludge treatment
Patent 3960725 Issued on June 1, 1976. Estimated Expiration Date: 
June 1, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 1, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2096176 2413420 2487600 2542743 2559441 2570532 3163598 3395221 3559807 3575854 InventorsAssigneeApplicationNo. 519559 filed on 10/31/1974US Classes:210/770, Including drying (e.g., by squeezing or heating, etc.)159/11.1, Rotary drum or disk159/12, Inclosing chamber159/49, Film210/259, Diverse210/294DIVERSE DISTINCT SEPARATORSExaminersPrimary: Wyse, Thomas G.Assistant: Mukai, Robert G. Attorney, Agent or FirmForeign Application Priority Data1973-11-05 SWAbstractSludge 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. | |
