Chemimechanical desilication of nonwood plant materials

Details Chemimechanical desilication of nonwood plant materials Chemimechanical desilication of nonwood plant materials

D - Textiles, Paper

21

C

D21C 1/04 (2006.01) D21C 1/00 (2006.01) D21C 9/10 (2006.01) D21H 11/12 (2006.01)

Patent

CA 2526406

A process for removing silica from nonwood plant materials involving both chemical and mechanical action is described. The silica-rich epidermal cells are liberated mechanically by a pre-pulping and low-consistency refining step and subsequently removed from the pulp via the filtrate of a thickening step. Amorphous silica is liberated chemically by using an alkaline dilution source in the pulper, then removed from the pulp via the filtrate of a thickening step and a dewatering step. The silica is then removed from the filtrate by adjusting the pH, followed by a separation step. The desilicated fibrous material may then be chemically or mechanically pulped and bleached using known processes. The silica removed from the nonwood plant material may then be used as a feedstock for other applications.

Procédé de désilification chimio-mécanique de matières végétales non ligneuses. Les cellules épidermiques riches en silice sont libérées mécaniquement par une opération de pré-trituration et e raffinage à faible consistance, puis extraites de la pulpe dans le filtrat d'un opération d'épaississement. La silice amorphe est libérée chimiquement au moyen d'une source de dilution alcaline solution alcaline dans la dépulpeuse, puis retirée de la pulpe dans le filtrat d'une opération d'épaississement et de déshydratation. La silice est ensuite extraite du filtrat par ajustement du pH, suivie d'une opération de séparation. Le matériau fibreux désilicifié peut alors être trituré et décoloré chimiquement ou mécaniquement par des procédés connus. La silice extraite de la matière végétale non ligneuse peut servir de charge d'alimentation pour d'autres applications.

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