Process for controlling operation of a flotation cell

B - Operations – Transporting – 03 – D

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Details

B03D 1/00 (2006.01) B03D 1/02 (2006.01) B03D 1/14 (2006.01) D21B 1/32 (2006.01) D21C 5/02 (2006.01) D21F 1/70 (2006.01)

Patent

CA 2458100

The present invention relates to a process for controlling operation of a flotation cell, wherein the liquid level and the foam level in the cell are measured and controlled. The process according to the invention is characterized by at least one quality characteristic of the accept leaving the cell being measured and the set value(s) for the liquid level and/or the foam level being determined on the basis of this quality characteristic. Thus the operation of the flotation cell is controlled on the basis of the quality of the accept leaving the cell. This makes the control system more flexible and maintains the process at an optimum in terms of energy consumption and loss of valuable resources. The process according to the invention is particularly suitable for flotation of a pulp suspension, particularly in deinking flotation.

La présente invention traite d'un procédé qui permet de réguler le fonctionnement d'une cellule de flottation, par lequel le niveau du liquide et le niveau de l'écume dans la cellule sont mesurés et contrôlés. Selon cette invention, le procédé est caractérisé au moins par une caractéristique de qualité de l'accepté quittant la cellule mesurée et la ou la valeurs de consigne pour le niveau de liquide et/ou le niveau d'écume déterminés par ces caractéristiques de qualité. Par conséquent, le fonctionnement de la cellule de flottation est régulé en fonction de la qualité de l'accepté quittant la cellule. Ce mode opératoire rend le système de régulation plus souple et maintient optimal le procédé en matière de consommation d'énergie et de perte de ressources de valeur. Selon cette invention, ce procédé convient particulièrement pour la flottation de la pulpe en suspension, en particulier dans la flottation de désencrage.

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