【摘要】 对宣化钢铁公司石灰厂所用的石灰石的分解过程进行了动力学研究.以升温速率分别为10、15、20、25和30℃/min的方式将过200目筛子的石灰石粉末加热到1000℃,通过测量其热重曲线,得出分解过程的机理方程为F(α)=(1-α)-1;所用碳酸钙的热分解反应的速率常数为k=54325e-98873/RT.通过对(0.02m×0.02m×0.02m)的石灰石样品在1223、1323和1423K进行的分解实验,确定了CO2在该石灰石生成CaO过程中的扩散系数和温度的关系为lgD=-25062/T+2.28,得到了石灰石分解的动力学模型,并用此模型作了预测,与实际吻合较好.更多还原

【Abstract】 The limestone decomposed to activity lime by TG at the rates of 10, 15, 20, 25 and 30℃/min was studied. The decomposing mechanism equation is F (α ) = (1 - α )-1, and the reaction rate constant is 98873k = 54325e -RT. It is founded that the diffused constant in the decomposition of lime from limestone is lg D25062028= - T+ , a dynamics model of decomposing time of limestone with the decomposition ratio XB was revised, and the finished time of limestone decomposition at 1423 K was forecasted with this model. It indicates that the forecasted results agree very well with the experiment results.更多还原