Method for distributing a sludge to be filtered over the upper surface of the filter cloth of a rotating belt filter
AssigneeNordengren Patenter AB
InventorRolf Gunnar Jonas Nordengren
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Abstract
The present invention is concerned with a method of distributing sludge to be filtered, to the filter surface of an endless-belt filter, so as to maintain a uniform solids content of said sludge. The incoming sludge is in this connection charged to a sludge receiving means in which the sludge is divided into two part-flows such that one of said part-flows contains a higher percentage of solids than the other, whereafter the two part-flows are united and the resultant flow discharged to said filter surface.
Claims1
In the known method of filtering a sludge which is composed of calcium sulfate as the solid component and phosphoric acid as the liquid component, which method includes transporting a sludge to a point near an endless belt filter, depositing said sludge on said endless belt filter, and filtering at least a portion of the liquid away from said sludge while it is on said endless belt filter, the improvement which comprises:
- a. introducing said sludge into a sludge receiving zone,
- b. dividing said sludge into two separate streams in said sludge receiving zone so that one of said two separate streams contains a higher percentage of solids than the other of said two separate streams,
- c. uniting said two separate streams so as to obtain a united sludge stream of substantially uniform solids content, and
- d. discharging said united sludge stream on an endless belt filter.
Dependencies are inferred from the claim text.