Patent ID: 9550681
Date: 2017-01-24
CPC Classifications: B01J,C01B,F27B,F27D

Claim:
1. A method for producing silicon using microwave, the method comprising: supplying a material of a mixture of a silica powder and a graphite powder or a mixture of a silica powder, a silicon carbide powder and a graphite powder into a refractory chamber of silica or silicon carbide; irradiating the material in the chamber with microwave so that the graphite powder absorbs a microwave energy to increase a temperature, and a reduction reaction is allowed to occur between the silica and the silicon carbide and/or the graphite after the temperature is increased, thereby producing an SiO gas as an intermediate product, and the SiO gas is allowed to be in contact with silica, graphite and/or silicon carbide while preventing the SiO gas for reaction from escaping out of the refractory chamber, thus reducing silica through a gas-solid reduction reaction, thereby allowing for continuous production of molten silicon; and discharging the molten silicon out of the chamber; passing generated discharge gas containing CO gas and unreacted SiO gas through a cyclone; and retrieving the unreacted SiO gas from said discharge gas in the cyclone and capturing Si.