Coal gangue recycling method

The invention discloses a coal gangue recycling method. The coal gangue recycling method comprises the following steps that hard coal gangue which has the free swelling ratio smaller than 35%, contains less than 40% of expansible coal gauge, less than 10% of organic substances and over 80% of oxides, has the ignition loss less than 15% and is stored for over five years is selected, calcined at thetemperature of 800 DEG C, then crushed and screened by a 100 mm sieve for later use; aggregate and the screened coal gangue are mixed according to the volume ratio of 3:7 to make sure that the errorbetween the water content of coal gangue mixtures and the optimal water content is +/-2, and thus, coal gangue mixtures are obtained; and the coal gangue mixtures are laid layer by layer. According tothe coal gangue recycling method, the coal gangue calcined at the high temperature is used as backfill materials of a building cushion, so that the coal gangue is recycled, and the environment is protected. 本发明公开了种煤矸石回收利用方法，包括