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本文在模拟高炉条件下动态测定烧结矿还原粉化的热转鼓中,对我国高品位细磁精矿制成的不同碱度烧结矿进行了低温还原粉化率的测定。并与澳大利亚赤铁矿粉制成的烧结矿进行对比。通过测定发现我国高品位细磁精矿烧结矿在碱度1.7—1.8左右、还原温度为500℃时,有最高的还原粉化率,大于或低于此碱度的烧结矿,还原粉化率减轻。澳大利亚赤铁矿粉烧结矿在低碱度(R=0.9)时有严重的低温还原粉化率,但随着碱度上升,粉化率减轻。通过改变还原温度、以H_2代替CO作还原剂、同时对各种烧结矿还原前后的矿物组成及显微结构进行岩矿相鉴定,获得了烧结矿还原粉化的机理性说明。此外还在高炉内对烧结矿进行了还原粉化试验。
In this paper, we simulate the blast furnace in the dynamic determination of sinter reduction pulverization of the thermal drum, the high-grade fine magnetic concentrate made of different alkalinity sinter for the determination of low-temperature reduction pulverizer. And compared with the sinter made from Australian hematite powder. Through the test, it is found that the high grade fine magnetic ore sinter in our country has the highest reduction and pulverization rate at the basicity of 1.7-1.8 and the reduction temperature of 500 ℃, the sinter with the basicity above or below this basicity, the reduction and pulverization rate Reduce. The hematite ore sinter in Australia has severe low temperature reductive chalking rates at low alkalinity (R = 0.9), but as the alkalinity increases, the chalking rate decreases. By changing the reduction temperature and using H_2 instead of CO as the reductant, the mineral composition and microstructure of various sinter before and after reduction were identified, and the mechanism of reduction and pulverization of sinter was obtained. In addition, sinter is also carried out in the blast furnace reduction powder test.