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高炉渣是高炉炼铁的主要副产品,含有大量显热,是一种很好的二次资源。然而,传统水淬粒化工艺对熔渣显热没有任何回收利用。针对高炉熔渣热量的回收问题,国内外在实验室进行了大量研究,这些研究大致可分为物理换热法和化学回收法。与物理法相比,化学法回收高炉熔渣显热更具有前景。详尽地对化学法回收高炉熔渣显热进行了评述,包括了利用甲烷循环反应、甲烷重整制氢、煤气化反应和高炉渣直接制备高附加值材料等。分析了各种方法的优劣,在此基础上,阐述了高炉熔渣显热回收需要解决的关键问题和发展趋势。
Blast furnace slag is the main by-product of blast furnace ironmaking, which contains a large amount of sensible heat and is a good secondary resource. However, the traditional water-quenching granulation process does not have any recycle of the sensible heat of slag. Aiming at the problem of heat recovery of blast furnace slag, lots of researches have been carried out in laboratories at home and abroad. These researches can be roughly divided into physical heat exchange method and chemical recovery method. Compared with the physical method, chemical recovery of blast furnace slag sensible heat more promising. Detailed comments on the sensible heat recovery of blast furnace slag by chemical method are summarized, including the use of methane cycle reaction, methane reforming to hydrogen production, coal gasification reaction and blast furnace slag to directly prepare high value-added materials. The advantages and disadvantages of each method are analyzed. On this basis, the key problems and development trends to be solved for the blast furnace slag sensible recovery are expounded.