Anti-oxidation silica carbide pouring material

Abstract

The present invention relates to an antioxidant silicon arbide pouring material, belonging to the field of refractory material technology. Its composition includes: large crystal silicon carbide granules whose grain size is less than or equal to 7 mm 68-72%, alumina cement 2-12%, silicon carbide matrix whose grain size is less than or equal to 320 meshes 8-10%, alpha-Al2O3 micrpowder whose grain size is less than or equal to 4 micrometers 5-6 %, SiO2 micropowder whose grain size ia less than or equal to 1 micrometer 4-5 % and boric acid 0.1-0.3% and composite antioxidant 1-2%. Said pouring material raises resistance to oxidation, reduces porosity, raises resistance to slag corrosion, can make its service time have adjustability, and can improve furnace adaptability, and can raise the service life of incinerator.

Description

technical field [0001] The invention relates to a refractory material, in particular to an anti-oxidation silicon carbide casting material used in a garbage incinerator. technical background [0002] The quality of the refractory material in the furnace is the key to the long-term and full-load safe production of the waste incinerator, especially the lower part of the walls on both sides of the waste incinerator, due to the volatile gas, molten matter, fly ash and slag generated by waste incineration, etc., Refractory materials are also required to have good wear resistance, corrosion resistance, slag resistance, and oxidation resistance. At present, refractory materials used in waste incinerators at home and abroad are usually silicon carbide castables, which use silicon carbide particles as aggregates to pass through It is made of low-cement micro-powder, and there are obvious deficiencies in actual use and construction, which are manifested in: 1. The particle size of sil...

AI Technical Summary

Problems solved by technology

[0002] The quality of the refractory material in the furnace is the key to the long-term and full-load safe production of the waste incinerator, especially the lower part of the walls on both sides of the waste incinerator, due to the volatile gas, molten matter, fly ash and slag generated by waste incineration, etc., Refractory materials are also required to have good wear resistance, corrosion resistance, slag resistance, and oxidation resistance. At present, refractory materials used in waste incinerators at home and abroad are usually silicon carbide castables, which use silicon carbide particles as aggregates to pass through It is made of low-cement micro-powder, and there are obvious deficiencies in actual use and construction, which are manifested in: 1. The particle size of silicon carbide particles used as aggregate is less than or equal to 5 mm, which is brought about by the process of producing silicon carbide with the principle of sintering. As a result, the critical size of the particles is difficult to exceed 5 mm, and there are more pseudo-particles between the 5-3 mm silicon carbide particles. As aggregates, it is easy to cause structural looseness of the castable, and the construction thickness is also affected. Second, the volatilization and incineration temperature of harmful gases in the waste incinerator is between 650-1100°C, which is the weakest oxidation section of the silicon carbide castable, although the castable is added with aluminum oxide to increase its strength And sintering aid silica fume, but it has not fundamentally improved the oxidation resistance of the castable; Third, the castable uses alumina cement as a binder. This single binder makes the usable time of the castable unable to be adjusted arbitrarily. It is difficult to adapt to the specific occasions where the temperature difference between east, west, north and south is large, and the air humidity is greatly different, and the construction quality in various environments cannot be guaranteed.