Method for producing silicon carbide from silica gel byproduct in phosphorous fertilizer production
A silicon carbide and silica gel technology, applied in the comprehensive utilization of phosphate fertilizer by-product silica gel resources, the production of silicon carbide, and the field of inorganic chemical industry, can solve the problems of difficult to control spontaneous reaction, small product particle size and high purity, and achieve the benefit of protection and effective utilization. , small particle size, high purity effect
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Embodiment 1
[0027] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 45:55 for batching and mixing evenly; send the mixture into a high-temperature carbon tube furnace and vacuumize to 4.75×10 -2 mbar, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.75×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, and the pressure is 5.0×10 -2 mbar, heating up to 1650°C, the heating rate is 25°C·min -1, keep warm for 45min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product can be obtained after cooling to room temperature for 3h.
Embodiment 2
[0029] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 35:65 for batching and mixing evenly; send the mixture into the high-temperature carbon tube furnace and vacuumize to 4.75×10 -2 mbar, 1mbar=100Pa, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.75×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, 1CFH=472cm 3 min -1 , the pressure is 5.0×10 +1 mbar, heating up to 1450°C, the heating rate is 25°C·min -1 , keep warm for 60min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product can be obtained after cooling to room temperature for 3h.
Embodiment 3
[0031] After the raw materials are pretreated, press no 木炭 : n 石油焦 = 35:65 for batching and mixing evenly; send the mixture into the high-temperature carbon tube furnace and vacuumize to 4.50×10 -2 mbar, 1mbar=100Pa, heating up to 600°C, the heating rate is 25°C·min -1 , keep warm for 15min, and evacuate to 4.50×10 -2 Below mbar, use argon as the protective gas, the protective gas pressure is 0.02MPa, the protective gas flow rate is 5.0CFH, 1CFH=472cm 3 min -1 , the pressure is 5.0×10 +0 mbar, heating up to 1450°C, the heating rate is 25°C·min -1 , keep warm for 30min; use helium cooling, the helium pressure is 0.02MPa, the helium flow rate is 5.0CFH, and the reaction product is cooled to room temperature for 3h to obtain the product.
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