矿物原料对连铸保护渣渣膜结晶矿相的影响

Effect of Mineral Materials on Crystallization Phases in Flux Film

针对包晶钢铸坯表面时常出现质量缺陷的问题,根据包晶钢板坯连铸用保护渣组分范围,在实验室以水泥熟料和硼砂为基料,分别调配矿物原料石英、硅灰石、萤石、纯碱含量进行配渣,系统分析矿物原料对保护渣渣膜结晶矿相的影响,为合理选择保护渣以改善铸坯表面质量提供依据。结果表明,各系列试验渣渣膜结晶矿相均由硅灰石和枪晶石组成,各渣膜结晶率均达55%以上。保护渣中石英（6%~24%）、硅灰石（11%~19%）配加量增多,均使渣膜黏度、热流密度升高,促进渣膜中硅灰石大量生成;萤石（8%~16%）、纯碱（10%~18%）含量增加,液渣黏度降低,促使渣膜中枪晶石大量析出,利于渣膜控制传热。但当石英（≥22%）、硅灰石（≥17%）配加过量时,硅灰石大量析出,枪晶石显著减少至含量为零;反而当萤石（≥14%）、纯碱（≥16%）配加过量时,枪晶石大量析出,硅灰石不析出。

Due to the frequent surface eral materials on the properties and c defect happened to the peritectic steel slab, the effects of raw rystallization characteristics, of mold flux were investigated minusing process mineralogy in this study. Mold flux were mainly prepared using cement clinker and industrial mineral materials under laboratory conditions, the crystallization phases of the flux film were systematically identified and quantitatively analyzed. According to the analysis, the crystallization ratio of all the flux films reached more than 55% with additional mineral materials, and the main phases of the flux films are wollastonite and cuspidine. As the quartz（6% - 24% ） or woUastonite（ 11% - 19% ） addition increasing, viscosity and heat flow density of flux film increase, which facilitate the growth of wollastonite in the flux film. Whereas, with increasing fluorite（8% -16% ） or soda ash（10% -18% ）, the viscosity of flux film decreases, which promote the cuspidine content increase and thus heat transfer of flux film. When the quartz and wollastonite addition exceeded, it will lead to a large number of wollastonite and few cuspidine, the excessive fluorite and soda ash addition will lead to mass cuspidine and few wollastonite.