Recovering chemical values from black liquor

Details Recovering chemical values from black liquor Recovering chemical values from black liquor

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2185904

A method for the recovery of chemical values from spent lignocellulosic pulping liquor salts to produce white liquor of different sulfidities. Preferably, the white liquor is in the form of separate liquid streams, each of which is of a sulfidity that is different from the sulfidity of others of the streams. The method also provides for developing a white liquor stream which is essentially free of sulfide values, but which contains sodium hydroxide. Further, the method provides for the recovery of titanium values for recycling.

Procédé de récupération de substances chimiques de valeur à partir de sels de lessive de réduction en pâte lignocellulosique, afin d'obtenir une lessive fraîche présentant différentes teneurs en sulfure. La lessive fraîche se présente, de préférence, sous la forme d'écoulements de liquide séparés (18, 20, 32, 34, 35, 36, 43, 45, 47) possédant chacun une teneur en sulfure différente de celle des autres écoulements. Le procédé consiste également à créer un écoulement de lessive fraîche (50) sensiblement exempt de sulfure mais contenant de l'hydroxyde de sodium. De plus, le procédé permet de récupérer du titane de recyclage.

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