B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/56
B01D 33/06 (2006.01) B01D 33/00 (2006.01) B01D 37/02 (2006.01) C01F 11/02 (2006.01) C04B 2/02 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1267367
Abstract of Disclosure The present invention concerns a procedure for filtering lime sludge meant to be regenerated to lime. Lime sludge is produced in the causticizing process in a sulphate cellulose mill, where it can be reused after regeneration to lime. In the procedure, lime sludge suspension is filtered on a filter drum in continuous rotation by depositing lime sludge on the drum and detaching part of the super- ficial layer of the lime sludge on the drum with a scraper so that the deeper lime sludge layer on the drum, which by-passes the scraper, serves as filtering medium for the superficial layer that is detached (as a so-called pre-coat). The purpose of the invention is to arrange the control of the filtering process in such manner that the dry matter content of the lime sludge detached from the drum is substantially constant, and its essential feature is that the dry matter content of the lime sludge detached from the drum is followed in such manner that when the dry matter content tends to decrease the speed of rotation of the drum is first raised within a given control range and, after the control range has been used up, the scraper is moved closer to the surface of the drum so that at least part of the deeper lime sludge layer on the drum, serving as filtering medium, is detached and, if the scraper is returned to its earlier position, is replaced with a new lime sludge layer, whereupon the control is again continued with the aid-of the drum's speed of rotation.
505037
Engdahl Holger
Kohonen Raimo
Kosonen Markku
Lankinen Matti
Niskanen Jukka
Engdahl Holger
Enso-Gutzeit Oy
Kohonen Raimo
Kosonen Markku
Lankinen Matti
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