(Project) An object of the present invention is to prevent a solvent outlet from being blocked by a solid precipitated from a saturated solution while the centrifugal separator continues to operate. (Solution means) The solid material fed into the rotary tube and the treated material composed of a saturated solution in which the solid material is dissolved are separated into solid-liquid by centrifugal force, and the screw conveyor disposed inside the rotary tube is rotated in the axial direction of the rotary tube. In a decanter-type centrifugal separator that discharges solid components from a solid discharge port formed on one end and liquid components from a solvent discharge port formed on the other end side, during centrifugation of a treated product, the inside of the rotary tube is moved toward the solvent discharge port A decanter-type centrifugal separator having a dilution solvent supply unit for supplying a diluent solvent for reducing the concentration of the saturated solution to a discharge path formed on the solvent outlet side rather than the treatment material supply chamber in the axial direction.
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