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2750 N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1250 N，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。
In order to research the compressive strength of pellets in blast furnace, pellets were tested in a neutral and re-ducing atmosphere at different temperatures and reduction degrees by using self-designed and manufactured high-tempera-ture strength and creep solid materials online tester. The results show that: in neutral atmosphere, when the temperature reaches 1 000℃, the compressive strength is over 2 750 N. With the temperature increasing, there is a sharp decline on the compressive strength;in reducing atmosphere, there is a significant strength decrease between the initial reduced pellets than the pellets in neutral atmosphere at same temperature. When the temperature is up to 900℃, the strength is only 1 250 N and the fragment pellets are more likely powdering. The microstructure analysis indicates that the growth of lattice, the new iron with increased porosity and cracks, and the weakness of particle bonding cause the decrease of compressive strength.
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