Abstract：The sinter is prone to fragmentation and pulverization under the low temperature reduction atmosphere of blast furnace, which will seriously affect the permeability of blast furnace and destroy the smooth operation of blast furnace. Low temperature reduction degradation index(RDI＞3.15 mm) is an important index to reflect the occurrence degree of low temperature reduction pulverization of sinter, but its size is affected by the main factors such as MgO, Al2O3 and alkalinity R in sintering raw materials. In order to explore the influence and interaction of sintering raw material composition factors on the low-temperature reduction and pulverization performance of sintered ore, an optimization method of sintering raw material blending based on RDI＞3.15 mm response surface was proposed. Firstly, with w(MgO), w(Al2O3), and the basicity R as independent variables, and with the sinter RDI＞3.15 mm index as the response value, the sinter RDI＞3.15 mm index was established. Secondly, the sinter RDI＞3.15 mm index obtained from the experiment was fitted to obtain the prediction formula of the sinter RDI＞3.15 mm index. Finally, the sinter was made by the optimal raw material ratio and its RDI＞3.15 mm index was measured. The RDI＞3.15 mm index verifies the accuracy of the proposed method. The results show that the fitting degree R2 of the new model to the sinter RDI＞3.15 mm index is 0.990 4, and the correction coefficient R2adj is 0.978 0, indicating that the predicted value fits the actual value well, and the sinter RDI>3.15mm response surface model is proved. It is statistically significant; the significant degree of influence of each factor on the sinter RDI＞3.15 mm index is w(MgO) > basicity R > w(Al2O3), and w(MgO) and w(Al2O3), w(MgO) and alkalinity R, w(Al2O3) and alkalinity R have significant interaction between two factors; The determined optimal raw material ratio is w(MgO) of 2.66%, w(Al2O3) of 2.02%, and alkalinity R of 2.2. Based on the prediction formula and experiment of RDI＞3.15 mm index, the optimal raw material ratio conditions are obtained. The measured value (74.51%) of the lower sinter RDI＞3.15 mm is basically consistent with the predicted value (74.21%). The new method of sintering and ore blending optimization introduced provides a theoretical basis for improving the performance of sintered ore reduction and pulverization at low temperature.
包国营, 刘磊, 韩秀丽, 段博文, 钦礼文. 基于RDI＞3.15 mm响应面法的烧结原料配矿方案优化[J]. 钢铁, 2023, 58(1): 31-38.
BAO Guo-ying, LIU Lei, HAN Xiu-li, DUAN Bo-wen, QIN Li-wen. Optimization of sintering raw material blending scheme based on RDI＞3.15 mm response surface methodology[J]. Iron and Steel, 2023, 58(1): 31-38.
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