关键词: 有机硅浆渣, 固废, 石油焦, 高温热解, 碳热还原, 碳化硅

Abstract: The organosilicon slurry solid waste was firstly pyrolyzed at high temperatures,pelletized with excess petroleum coke,and then prepared into SiC powder was by the carbothermal reduction method.The effect of the pyrolysis temperature (1 000,1 200,1 400 and 1 500 ℃) on the organosilicon slurry solid waste was studied.On this basis,the effects of the heat treatment temperature (1 550,1 650,1 750 and 1 850 ℃) and the holding time (15,30,45,60 and 75 min) on the preparation of SiC were investigated.The results show that when the pyrolysis temperature is 1 500 ℃,the organosilicon slurry solid waste can be pyrolyzed to a large extent,and the products are mainly SiC and cristobalite,which indicates that SiC can be prepared with the raw material by the metallurgical method.The optimum heat treatment temperature for excess carbon smelting is 1 750 ℃,obtaining the highest SiC content.The SiC grain size increases with the temperature further increasing.Prolonging the holding time at 1 750 ℃ is helpful to the reaction.The optimal holding time is 60 min,achieving the highest SiC content.However,when further prolonging the holding time,the granular SiC aggregates and grows to form massive SiC.

Key words: organosilicon slurry, solid waste, petroleum coke, high temperature pyrolysis, carbothermal reduction, silicon carbide