PURPOSE: To efficiently separate a solid-liquid mixed material hard to be separated by a filter process, an evaporation process and an adsorption process by pushing up slurry in a vertical cylinder from below, pressure-tightening by self-weight, forming cakes flowing down continuously a liquid containing leaked slurry and separating the same from the wall of the cylinder.

CONSTITUTION: In the case of applying this process to a solid-liquid separation device for squeezing molten zinc from dross sampled from a plating bath for a molten zinc plated steel plate and separating the same, first the dross is fed from a feed opening 1 into a container. Then, a valve 2 is opened, and the dross is fed at a low speed from a slurry drain outlet of a start-up pump 3 into the lower section of a liquid removing container 4. Cakes 7 are formed by the fed dross when the dross is raised while being compressed between an inner cylinder and an outer clyinder 5 and 6 of the liquid removing container 4, and simultaneously the molten zinc is squeezed. Then the cakes 7 of lowered fluidity are continued to rise at a low speed, and discharged into another container from above the liquid removing container 4 by a scraping means, and the molten zinc is passed through a number of through holes 8 formed in the inner cylinder 5 and recovered.