Method for preparing silicon carbide through adopting coal gangue extraction aluminic acid sludge

The invention relates to the field of cyclic utilization of resources, in particular to the field of resourceful efficient utilization of coal solid waste and agricultural solid waste, specifically toa method for preparing silicon carbide through adopting coal gangue extraction aluminic acid sludge, and specifically to a method for preparing the silicon carbide through adopting microwave calcination. The method concretely comprises the following steps: taking the coal gangue extraction aluminic acid sludge as a silicon source and agricultural waste organic matter as a carbon source, and preparing the silicon carbide through microwave-assisted carbon thermal reduction reaction. The manufacturing process comprises the following steps: enabling straw starch, which is prepared via dipping, stewing, filtering and pressing agricultural waste straw, to be effectively mixed with a utilizable silicon source, which is obtained from the coal gangue extraction aluminic acid sludge in an alkalinemethod extraction silicon