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进行了超高碱度烧结,适宜工艺参数,不同SiO2含量,烧结强化措施的实验室试验研究。试验结果表明,在碱度2.0~3.2范围内,随着碱度的上升,ISO转鼓指数上升,利用系数提高,烧结速度加快,成品率下降。在碱度2.0~2.8范围内,指标几乎成直线上升,碱度2.8以后部分指标开始出现下降趋势,碱度2.8是攀钢现有烧结矿的最适宜碱度。随着碱度的提高,烧结矿中钛赤铁矿与钛磁铁矿减少,铁酸盐含量增加,钙钛矿约有增加,硅酸盐变化不大。还原性与低温还原粉化率均得到改善,软化与熔融开始温度上升,软化区间与滴落区间减薄,有利于改善高炉透气性。在超高碱度2.8条件下,应用正交试验对工艺参数寻优,并进行了强化措施试验。在目前生产条件下有必要将碱度从2.4提高至2.8,SiO2质量分数为5.0%合适,根本途径在于钒钛精矿提铁降硅降钛。
The laboratory tests of ultrahigh basicity sintering, suitable technological parameters, different SiO2 contents and sintering strengthening measures were carried out. The results showed that the ISO drum index increased with the increase of alkalinity in the alkalinity range of 2.0 ~ 3.2, the utilization factor increased, the sintering speed increased and the yield of finished products decreased. Alkalinity ranged from 2.0 to 2.8, the index rose almost linearly, some indexes began to decline after alkalinity 2.8, and alkalinity 2.8 was the most suitable alkalinity for the existing sinter in Pangang. With the increase of alkalinity, the content of titanium hematite and titanium magnetite decreased, the content of ferrite increased, the content of perovskite increased and the content of silicate changed little. Reducing and low temperature reduction and pulverization rate are improved, softening and melting start temperature rise, softening range and drip interval thinning, help to improve the blast furnace gas permeability. Under the condition of ultrahigh alkalinity 2.8, orthogonal test was used to optimize the process parameters and to test the strengthening measures. In the current production conditions it is necessary to raise the alkalinity from 2.4 to 2.8 and the SiO2 content of 5.0% is suitable. The fundamental approach is to extract iron, reduce silicon and reduce titanium in vanadium-titanium concentrates.