Patent ID: 9296617
Filing Date: 2016-03-29
CPC Classification: C01B

Claim Text:
1. A method for separating and recovering silicon from silicon sludge, comprising: (a) distilling silicon sludge generated in a semiconductor manufacturing process to remove oil components; (b) dispersing the distilled silicon sludge in distilled water to prepare a silicon sludge solution in which a concentration of silicon sludge is from 2 to 4 weight %; (c) performing ultrasonic treatment by applying ultrasonic waves to the silicon sludge solution at an intensity of 200 W to 400 W for 20 to 240 minutes; (d) performing centrifugation on the ultrasonic treated silicon sludge solution at 300 to 700 rpm for 5 to 100 minutes to perform phase-separation; and (e) recovering silicon particles from the phase-separated silicon sludge solution by single centrifugation.