Available silicone was melted from coal gangue samples from Hancheng diggings through calcination, digestion, and other means. The best calcination temperature was determined from a range of 550～1 150 ℃; and the best time, from a range of 0.5-5 h by colorimetry method. The proper ratio of coal gangue, limestone, sodium carbonate, and caustic soda was then determined through orthogonal experiment. The results show that the proper extraction condition for available silicone is the ratio of coal gangue, limestone, sodium carbonate, and caustic soda at 1:0.5:0.1:0.05, calcination temperature at 700℃,and calcination time at 2 h. In this condition, the available silicone content can be more than 19.65%.
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