B - Operations – Transporting – 09 – B
Patent
B - Operations, Transporting
09
B
B09B 3/00 (2006.01) C02F 11/00 (2006.01)
Patent
CA 2651440
A process in which a suspension comprising dispersed particulate material in an aqueous medium is transferred as a fluid to a deposition area, then allowed to stand and rigidify, and in which rigidification is improved whilst retaining the fluidity of the suspension during transfer, by combining with the suspension during transfer a rigidifying amount of a treatment system which comprises i) a water-soluble synthetic polymer and ii) a water-soluble natural or seminatural polymer. Improved rigidification can be achieved, including dose efficiency especially in regard to the amount of synthetic polymer required. In addition improvements in the clarity of liquor released from the suspension can be achieved.
La présente invention concerne un procédé dans lequel une suspension comprenant un matériau particulaire dispersé dans un milieu aqueux est transférée sous forme de fluide dans une zone de déposition, dans laquelle elle repose et se rigidifie ensuite, le raidissement étant amélioré tandis que la fluidité de la suspension est retenue durant le transfert, en combinant à la suspension au cours du transfert une quantité apte à rigidifier d'un système de traitement comprenant i) un polymère synthétique soluble dans l'eau et ii) un polymère naturel ou semi-naturel soluble dans l'eau. Il est possible d'obtenir un raidissement amélioré, avec efficacité de la dose, surtout en ce qui concerne la quantité de polymère synthétique nécessaire. Il est en outre possible d'obtenir une meilleure limpidité de la liqueur issue de la suspension.
Beveridge Angela
Dymond Brian
Lamperd John
Ciba Holding Inc.
Fetherstonhaugh & Co.
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