Device for cleaning and recovering paper pulp

DETAILED DESCRIPTION The object of the present invention is a sorter device capable of continuously cleaning a paper pulp by supplying washed refusals containing no more than 10% of paper pulp.
The device which is the object of the invention is characterized in that it comprises a closed tank provided with a pulp inlet and a cleaned pulp outlet, said tank containing a fixed sieve separating two chambers, an inner chamber and an outer chamber, and an inner rotor carrying blades or vanes moving in the vicinity of the sieve; the outer chamber, encompassed between the sieve and the tank wall, being provided with a helical wall and having thus the shape of a helical channel which is wrapped around the sieve from the pulp inlet to a refusals dead end situated at two opposite ends of said outer chamber, the said dead end comprising a gate to extract the refusals from time to time.
The invention aims also at the following dispositions: there is foreseen an additional water inlet in the inner chamber, on the side of the pulp arrival, the helical outer chamber is placed such that it is wrapped around the fixed sieve from the pulp inlet to the refusals outlet, with a rotation direction consistent with that of the liquid in said outer chamber, this rotation direction is the direction contrary to that of the rotor rotation direction.
In a preferred embodiment of the invention the pulp inlet and the cleaned pulp outlet are on the same side of the apparatus and the dead end as well as the additional water inlet are on the opposite side of the apparatus.