COOLANT REGENERATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coolant regeneration method capable of regenerating a coolant in a high yield while having a function to remove sludge adhered to a rotating body.

SOLUTION: The coolant regeneration method 1 includes: a detergent discharge step S0' of discharging a detergent to a vertical centrifugation device; a sludge washing step S0" of rotating a rotating body of the vertical centrifugation device from which the detergent is discharged at a speed lower than a rotating speed in centrifugation step to wash and remove sludge adhered to the vertical centrifugation device; a coolant supply step S1 of supplying a used coolant to a centrifugation unit including the vertical centrifugation device; a centrifugation step S2 of centrifugally separating the used coolant supplied to the centrifugation unit into a solid content containing silicon chips and a centrifugation liquid; and an intermittent control step S3 of intermittently controlling the supply of the used coolant with the vertical centrifugation device of the centrifugation unit being operated.

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