Apparatus for extracting with a liquid, products which are part of solids

Apparatus for extracting by means of a liquid, products which are part of solids, comprising;

• a rotating drum having a substantially horizontal axis, two conveying spiral screws nested within one another and arranged co-axially with said axis, a partition passing through said drum axis and forming, together with the radial walls from the conveying screws, two series of succeeding cells inside which move continuously without mixing along a direction in parallel with said axis, two fractions of solids, one said fraction being contained inside that cell series lying on one side of said partition, the other fraction being contained inside those cells lying on the other partition side, a basket pervious to said liquid and arranged inside each one of said cells for separating the solids from the liquid during rotation of said drum, said basket comprising at least one perforated wall extending substantially parallel with said partition in front thereof when considering the drum rotating direction, said wall being so arranged that said basket lies on one side of a plane perpendicular to said partition which passes through the drum axis, liquid channels arranged at the back of that basket substantially in parallel relationship with said partition and extending from the drum circumference, along the drum axis for feeding said liquid in a direction opposite a conveyance direction of said solids, each said channel connecting, through said partition and openings provided in the conveying screw walls, one cell from a screw conveying part of said one solid fraction to the following cell from the screw conveying the other solids fraction in such a way that the liquid flows in two discrete parallel flows which meet alternately succeedingly those solids lying inside each apparatus cell, and such that the liquid flows advance during one drum revolution over 360.degree., over two cells in the direction opposite to the conveying direction of said solids, while the solids advance but over but over one cell, with the improvement that said apparatus comprises in association with each of said liquid channels extending along the drum axis, a liquid channel arranged inside each cell and extending cross-wise to said axis, adjacent thereto, for collecting the liquid which has been separated from the solids and flowing over said wall, when same lies in a position near the horizontal and has moved past said position, said channel extending along the drum axis and the cross-wise channel associated therewith starting from one and the same cell and ending in one and the same cell.