基于响应面法的烧结矿还原指数优化

Optimization of sinter reduction index based on response surface method

烧结矿还原指数是影响高炉生产的一个重要参数,而烧结原料及其配比是决定烧结矿还原性能好坏的根本原因之一。本文运用响应面法对烧结矿还原指数进行目标优化,采用CCD模块进行烧结配矿方案设计,以w(Fe_(2)O_(3))/w(Fe_(3)O_(4))、二元碱度[w(CaO)/w(SiO_(2))]和w(MgO)/w(Al_(2)O_(3))为变量因素,以烧结矿还原指数为目标指数,建立目标指数与变量因素之间的响应面模型;通过试验对响应面模型进行拟合运算,得到烧结矿还原指数预测方程;根据预测模型确定的原料成分最优配比自制烧结矿,对预测模型进行验证。结果表明,3种原料成分对烧结矿还原指数的影响显著效果由大到小依次为二元碱度[w(CaO)/w(SiO_(2))]、w(MgO)/w(Al_(2)O_(3))、w(Fe_(2)O_(3))/w(Fe_(3)O_(4)),三者之间任意两因素的交互作用均明显。烧结矿还原指数最优时,其原料配比:w(Fe_(2)O_(3))/w(Fe_(3)O_(4))=0.76、二元碱度[w(CaO)/w(SiO_(2))]=2.23、w(MgO)/w(Al_(2)O_(3))=0.82。通过烧结试验验证,烧结矿还原指数预测值为92.41%,试验值为92.1%,且烧结矿中针状铁酸钙含量较多,显微结构较好,反映该响应面法确定的最佳配比方案是准确可行的。

The reduction index of sinter is an important parameter affecting the production of blast furnace,and the sintering raw materials and their ratio are one of the fundamental reasons for determining the reduction performance of sinter.In this paper,the response surface method is used to optimize the reduction index of sinter,and the CCD module is used to design the ore blending scheme of sinter.With w(Fe_(2)O_(3))/w(Fe_(3)O_(4)),binary basicity[w(CaO)/w(SiO_(2))]and w(MgO)/w(Al_(2)O_(3))as variable factors,the reduction index of sinter is taken as the target index.The response surface model between target index and variable factor is established.By fitting the response surface model through experiments,the prediction equation of sinter reduction index is obtained.According to the optimal ratio of raw material composition determined by the prediction model,the prediction model is verified.The results show that the significant effects of the three raw materials on the reduction index of sinter are as follows:binary basicity[w(CaO)/w(SiO_(2))],w(MgO)/w(Al_(2)O_(3)),w(Fe_(2)O_(3))/w(Fe_(3)O_(4)),and the interaction of any two factors among the three is obvious.When the reduction index of sinter is optimal,the raw material ratio is:w(Fe_(2)O_(3))/w(Fe_(3)O_(4))=0.76,binary basicity[w(CaO)/w(SiO_(2))]=2.23,w(MgO)/w(Al_(2)O_(3))=0.82.Through the sintering test,the predicted reduction index value of sinter is 92.41%,the test value is 92.1%,and the content of aciculate calcium ferrite in sinter is more,and the microstructure is better,reflecting that the optimal ratio scheme determined by the response surface method is accurate and feasible.