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为了降低焦炭的消耗,在含铁炉料中混加小块焦已成为现代高炉常规的操作措施。模拟高炉炉身的冶炼条件,研究了小块焦对碱性烧结矿和酸性球团矿还原行为的影响。模拟还原过程在不同的煤气成分、900～1250℃的等温条件和400～1250℃非等温条件下进行。等温还原试验结果表明:未混加小块焦时,球团矿和烧结矿分别在1050℃和1100℃出现还原停滞现象;而混加小块焦后,烧结矿和球团矿还原过程中的停滞现象被抑制,还原性也得到了改善。非等温还原试验结果表明:随着含铁炉料料层中的小块焦数量的增加,炉料的还原性得到改善。比较了小块焦对烧结矿和球团矿还原性影响的差异。采用光学显微镜和扫描电子显微镜,对烧结矿和球团矿混加或未混加小块焦,在不同温度下的还原机理进行了微观分析研究。
In order to reduce the consumption of coke, mixing small pieces of coke in the iron-bearing charge has become a routine operation of modern blast furnaces. The blast furnace smelting conditions were simulated and the effect of small coke on the reduction behavior of alkaline sinter and acid pellets was studied. The simulated reduction process was carried out under different gas compositions, isothermal conditions of 900-1250 ℃ and non-isothermal conditions of 400-1250 ℃. The results of isothermal reduction test show that the pellets and sinter show the reduction and stagnation at 1050 ℃ and 1100 ℃, respectively, when the coke is not mixed with small coke; Stagnation was suppressed and reducibility also improved. The results of the non-isothermal reduction test show that the reducibility of the charge improves with the increase of the small coke amount in the material layer of the iron-containing furnace. The differences of small coke on the reducibility of sinter and pellet are compared. Using optical microscope and scanning electron microscope, microscopic analysis of the reduction mechanism of sinter and pellet with or without small coke addition was carried out.