Initially, a large granular mass of coal power plant bottom ash (Hadong Power Plant, Korea) was ground to obtain a fine powder using a commercial mixing-grinder, and the coarse bottom ash powder was sieved to particles of less than 100 µm size. Alkali fusion and silicate extraction were then conducted based on the procedure reported by Kumar et al.. Bottom ash was mixed with NaOH powder at a 1:1.2 weight ratio. It was then fused at 600 ◦C for 1 h. The fused mixture was cooled to room temperature, ground to fine powder, and finally mixed with water at a weight ratio of 1:4. The extracted supernatant solution was used for the synthesis of a mesoporous silica and the precipitate was used for the synthesis of zeolite 13X.