Recycling method of silicon carbide using Kerf loss sludge

摘要

The present invention comprises the steps of performing direct carbonation of the silicon carbide slurry at 1500 ° C. for 2 hours under argon atmosphere to produce silicon carbide (first step); Adding a dispersant, a binder, a plasticizer, and an organic solvent to the silicon carbide and pulverizing to prepare a precursor slurry, adding boron carbide to the precursor slurry at 1 to 5 wt%, pulverizing and mixing (second step); Drying the mixed precursor slurry to obtain a dry powder (third step); And sintering the dry powder at 2070 to 2160 ° C. for 1 hour to form a boron phase between the silicon carbide particles to increase fracture toughness of the sintered compact (fourth step). Provides silicon carbide recycling method. Therefore, it is possible to recycle solar sludge that is discarded and difficult to recycle. The recovery and recycling of solar sludge greatly reduces environmental and process costs.