To develop a utilization of fly ash (FA) generated from coal-fired power plant, Si and Al oxides, which are the main components of FA, were converted into valuable chlorides by chlorination. FA was mixed with solid carbon and heated under chlorine stream at a maximum temperature of 1000°C. The chlorination rate was accelerated by planetary ball milling, and after chlorination at 1000°C for 1h, 84 % and 89 % of Si and Al were converted to SiCl4 and AlCl3, respectively, and the residue reduced to 16 % of the original ash. Generated chlorides were recovered in the cooling section set at 100°C and -40°C, and 90.8% of volatilized Si was distributed to the condense at lower temperature section, and the purity of Si was 95.1%.
