ABSTRACT

In order to reveal the actual reaction behaviour and degradation mechanism of coke, chemical composition, mineral phase transformation and microstructure of coke at different locations in blast furnace were characterized. Meanwhile, the wear and compressive resistance, as well as the secondary thermal characteristic, were carried out. Results indicated that the mineral species and contents of cokes were significantly affected by alkali metal minerals adhesion and molten slag-iron corrosion. The alkali minerals and iron minerals adsorbed on the pore walls contributed to catalytic degradation of the bosh coke and tuyere coke respectively. In the upper zone of BF, the wear and compressive resistance of coke first decreased and then increased. The secondary thermal performance of BF coke was inverse with the content of alkali metal. The macropore structure of the hearth coke with the maximum graphitization disappeared to be replaced by slag and iron.

摘要

为了揭示焦炭的实际反应行为和降解机理，对高炉不同位置焦炭的化学成分、矿物相变和微观结构进行了表征。同时，进行了耐磨性和抗压性，以及二次热特性测试。结果表明，焦炭的矿物种类和含量受碱金属矿物粘附和熔渣-铁腐蚀的显着影响。吸附在孔壁上的碱性矿物和铁矿物分别促进了炉焦和风口焦的催化降解。在高炉上部，焦炭的耐磨性和抗压性先降低后升高。高炉焦的二次热性能与碱金属含量成反比。