A screw for a solid-bowl screw-type centrifuge, comprising: a screw body having
a circumference, a cylindrical section and a conical section; at least one screw
blade surrounding the screw body several times and forming several screw spirals;
a delivery path for conveying material to be centrifuged formed between the screw
spirals; blade segments arranged in the delivery path between adjacent screw spirals
only in a portion of the cylindrical section; and recesses in the at least one
screw blade, the recesses constructed only in a portion of the cylindrical section
and constructed such that the material to be centrifuged can flow through between
adjacent screw spirals. A method for extracting oil in a two- and three-phase separation
process using the screw of the present invention.
