首页|Regulation of Ti(C,N)deposition on hot surface of refractory in blast furnace hearth
Regulation of Ti(C,N)deposition on hot surface of refractory in blast furnace hearth
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Ti(C,N)concentration was found to be lower on the hearth sidewall of a blast furnace and increased gradually toward the bottom of the blast furnace.The Ti(C,N)protective layer in a blast furnace is thin.Therefore,the formation of a Ti(C,N)protective layer was promoted by studying the heterogeneous nucleation principle of titanium compounds on different substances and regulation measures for the deposition process of titanium compounds on refractories or impurities.The lattice disregistry between the titanium compounds and the main components in the refractory or the main impurities in the protective layer was calculated using a two-dimensional disregistry equation to study the heterogeneous nucleation principle of titanium compounds.The results revealed that in refractory materials,the heterogeneous nucleation of carbonitride is weak when C,SiO2,and Al2O3 are used as heterogeneous nucleation substrates,and the heterogeneous nucleation of carbonitride is strong when TiO2 and SiC are used as heterogeneous nucleation substrates.As nucleation phases,TiC,TiN,Ti(C0.3,N0.7),and Ti(C0.5,N0.5)have similar heterogeneous nucleation ability in single component refractory,and the type of carbonitride has little effect on the lattice disregistry.The impurities in the protective layer as the substrate phases are not conducive to the heterogeneous nucleation of carbonitride.When CaS was used as the substrate phase,the heterogeneous nucleation ability of carbonitride was the worst.Both carbon and alumina were not conducive to the heterogeneous nucleation of carbonitride,but carbon was more unfavourable than alumina.
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