Patent ID: 8821826

Claim:
A method for regenerating silicon from silicon waste, the method comprising: placing and mixing silicon waste, a solvent having pH of approximately 5 to approximately 6, and a surfactant within a container; injecting air into the container to separate floating matters and precipitates; separating silicon (Si) from the precipitates; and purifying and regenerating the silicon (Si), wherein an aspect ratio dividing a height of the container by an area of the container ranges from 3 to 5, wherein the silicon waste, the solvent, and the surfactant are mixed by stirring at a temperature of approximately 70° C. to approximately 80° C., wherein the silicon waste contains silicon as a main component, and aluminum (Al) to be separated; the precipitates contain a relatively larger amount of silicon than the floating matters; and the precipitates contain a relatively smaller amount of aluminum than the floating matters.