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运用自行设计制造的固态物料高温抗压强度与蠕变在线测试仪,分别测试球团矿在不同温度及还原度状态下的抗压强度及蠕变量,用以表征球团矿在高炉内不同位置的抗压能力。研究发现:未发生还原反应球团矿在中性气氛中,当温度达到1000℃时,球团矿的抗压强度为2750N以上,继续升温,球团矿抗压强度下降迅速;球团矿在还原气氛下,还原初期球团矿抗压强度比同温度下中性气氛球团矿抗压强度有较大下降,当温度高于900℃时,球团矿抗压强度只有1250N,且在抗压试验中形变明显。微观结构分析表明:还原过程中高价铁氧化物到低价铁氧化物变化过程中晶格增大、新生铁相基体孔隙增加、裂纹产生以及颗粒间固相固结减弱是导致强度下降的主要原因。
The self-designed high-temperature compressive strength and creep on-line tester for solid materials was used to test the compressive strength and creep of pellets under different temperatures and reductions, respectively, to characterize the different pellets in the blast furnace Position of the compressive capacity. The study found that: there is no reduction reaction pellets in a neutral atmosphere, when the temperature reaches 1000 ℃, the pellet compressive strength of 2750N or more, continue to heat up, the pellet compressive strength decreased rapidly; pellets in In the reducing atmosphere, the compressive strength of the pellets in the initial stage of reduction was significantly lower than that of the neutral atmosphere pellets in the same temperature. When the temperature was higher than 900 ℃, the compressive strength of pellets was only 1250N, Pressure test obvious deformation. The results of microstructure analysis show that the main reason for the decrease of the strength is the increase of the crystal lattice in the process of reduction from high-valent iron oxide to low-valent iron oxide, the increase of the porosity of the new-formed iron phase matrix, the generation of cracks and the weakening of the solid- .