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使用指示剂滴定法和“座滴法”研究了烧结熔剂(生石灰、白云石)活性度及高温液相行为。结果表明:生石灰的活性度存在显著差异,生石灰活性度主要取决于“匀速滴定阶段”的活性度;活性度较高的生石灰与Fe_2O_3纯试剂反应的特征温度较低、特征温度区间较窄;石灰石与Fe_2O_3纯试剂反应的特征温度较生石灰低,这主要是由于高温下生成的CaO活性度更高;白云石与Fe_2O_3纯试剂反应的特征温度最高,这主要是由于MgO·Fe_2O_3阻碍了铁酸钙的形成;白云石与Fe_2O_3纯试剂反应后的试样出现了明显的分层现象,内层矿相以MgO形成的高熔点物质为主,外层矿相以低熔点铁酸盐为主。
Using indicator titration and “droplet method”, the activity and the liquid phase behavior of sinter fluxes (quick lime and dolomite) were studied. The results show that there are significant differences in the activity of quicklime. The activity of quicklime mainly depends on the activity of “uniform titration stage”. The characteristic temperature of reaction of quicklime with high active lime and Fe_2O_3 pure reagent is lower, and the characteristic temperature range is narrower The characteristic temperature of reaction between limestone and Fe 2 O 3 pure reagent is lower than that of calcined lime, which is mainly attributed to the higher activity of CaO generated at high temperature. The highest characteristic temperature of reaction between dolomite and Fe 2 O 3 pure reagent is mainly due to MgO · Fe 2 O 3 blocking iron The formation of acid calcium; the sample after the reaction of dolomite and Fe_2O_3 pure reagent showed obvious stratification, the inner layer of the main high-melting point material formed by MgO, the outer layer of the main low-melting ferrite .