MOST older flotation cells use a displacement float below the froth layer to measure the pulp height. Pulp height is an important process measurement, used to ensure that liquid pulp is not allowed to overflow to the launders. If pulp overflows, the flotation cell ceases to function effectively, and this is very costly to the process. The displacement float technique is limited in performance in a variety of ways: the float may at times stick, slurry builds up on the float mechanism changing the effective specific gravity tracked and they are affected by high agitation.
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