D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/02 (2006.01) B01D 24/32 (2006.01) B01D 33/04 (2006.01) B01D 33/46 (2006.01) D06B 5/02 (2006.01) D06B 5/14 (2006.01) D21C 9/06 (2006.01) D21C 11/00 (2006.01)
Patent
CA 2337819
An aqueous slurry containing dissolved solids and a high concentration of suspended solids is positioned as a mat (3) between a pair of porous endless belts (2, 4) to provide a composite structure which is then moved through a treating zone (6) and subjected to alternate stages of compression and relaxation. The compression and relaxation are achieved by passsing the composite structure over a series of spaced rolls (7-12). A liquid stream (24) containing a high concentration of dissolved solid is cascaded over the mat in a countercurrent fashion so that the dissolved solids of the liquid stream are dissolved in the aqueous phase of the mat when the mat is subject to relaxation. The mat containing the increased concentration of dissolved solids and suspended solids is then compacted and the solid residue (39) is landfilled. The liquid stream (31) being discharged from the treating zone and containing a depleted concentration of dissolved solids is recirculated for use in a pulp/papermaking operation.
Une suspension dense aqueuse contenant des solides dissous et une concentration élevée de solides en suspension est positionnée sous la forme d'un matelas (3) entre une paire de bandes sans fin poreuses (2, 4) afin de former une structure composite se déplaçant ensuite à travers une zone de traitement (6) et soumise à des étages alternés de compression et de relaxation. La compression et la relaxation sont obtenues par passage de la structure composite sur une série de rouleaux espacés (7-12). Un courant de liquide (24) contenant une concentration élevée de solides dissous passe en cascade sur le matelas à contre-courant de manière à dissoudre les solides dissous du courant de liquide dans la phase aqueuse du matelas lorsque celui-ci est soumis à relaxation. Le matelas contenant la concentration accrue de solides dissous et de solides en suspension est ensuite compacté et le résidu solide (39) est envoyé à la décharge. Le courant de liquide (31) déchargé de la zone de traitement et contenant une faible concentration de solides dissous est recyclé afin d'être utilisé dans une opération de production de pâte/papier.
Hoffman Roger P.
Sim & Mcburney
The Hoffman Group Ltd.
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