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针对转炉使用石灰石替代石灰炼钢造渣速度加快的现象,研究首先将FeO_x、SiO_2以及按照一定配比烧制成的预熔渣与CaCO_3混合,来模拟石灰石在转炉炉渣中的环境,通过热重-差热(TG-DTA)同步热分析试验探寻其分解规律,研究结果表明炉渣组分能够大大降低CaCO_3的分解温度,提升石灰石的分解速度,并且多元预熔渣的促进效果强于单一炉渣组分。通过Flynn-Wall-Ozawa法计算不同混合体系中CaCO_3的分解活化能,结果发现炉渣组分能够降低其分解反应的活化能。将混合体系在管式炉煅烧后经X射线衍射分析后发现,CaCO_3的分解产物能够与炉渣组分结合生成氧化物或者固溶体,降低CaO的活度。最后通过热重-示差扫描量热法(TG-DSC)考察比较活性石灰和石灰石与预熔渣的化渣能力,试验结果表明二者化渣能力差别不大。
In order to accelerate the slagging rate of limestone instead of lime steel making process, the study firstly simulated the environment of limestone in converter slag by mixing FeO_x, SiO_2 and the pre-slag prepared according to a certain ratio with CaCO_3, (TG-DTA). The results show that the slag component can greatly reduce the decomposition temperature of CaCO_3 and improve the decomposition rate of limestone, and the promotion effect of multi-element pre-slag is better than single slag group Minute. The decomposition activation energies of CaCO_3 in different mixtures were calculated by Flynn-Wall-Ozawa method. It was found that the slag component can reduce the activation energy of the decomposition reaction. After the mixed system was calcined in a tube furnace and analyzed by X-ray diffraction, it was found that the decomposition products of CaCO 3 can combine with the slag components to form oxides or solid solutions and reduce the activity of CaO. Finally, the ability of slag of active lime, limestone and pre-slag was investigated by TG-DSC. The results show that there is little difference between the two.