Enhancement of gypsum based kraft process causticized sludge sedimentation rate under inclined condition

Autor: Prashant K. Bhattacharya, S. Basu
Rok vydání: 1983
Předmět:
Zdroj: The Canadian Journal of Chemical Engineering. 61:811-815
ISSN: 1939-019X
0008-4034
DOI: 10.1002/cjce.5450610607
Popis: An experimental programme for batch and continuous sedimentation was planned to study the feasibility of increasing the rate of sedimentation of the causticized slurry obtained with gypsum as make-up salt in a Kraft recovery cycle. The studies were conducted in tubular clarifier under vertical and inclined conditions. For batch sedimentation studies, attempts were made to make a comparative evaluation of existing models. A good agreement was observed with the effective width concept model. The presence of unreacted gypsum in the causticized slurry favours the rate of sedimentation. For continuous sedimentation studies, enhancement factor variation was observed from 1.39 to 4.20 under inclined conditions at steady state. On a planifie un programme experimental sur la sedimentation continue et discontinue afin d'etudier la possibilite d'augmenter la vitesse de sedimentation de la suspension caustique obtenue par addition de gypse a chaque cycle de recuperation du procede Kraft. Les experiences ont ete conduites dans un clarificateur tubulaire vertical ou incline. Dans les etudes de sedimentation discontinue, on a tente de faire une evaluation comparative des modeles existants; on a observe qu'il avait une bonne concordance pour le modele base sur le concept de largeur effective. La presence de gypse non converti dans la suspension caustique, ameliore la vitesse de sedimentation. Pour les etudes de sedimentation continue, on a observe une variation du facteur d'amelioration de 1.39 a 4.20, en regime stationnaire, dans le cas de tubes inclines.
Databáze: OpenAIRE
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