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我国用于冲天炉熔炼的焦炭中有高达20～30%,甚至50以上块度小于40 mm,不能用于熔炼。为了使用这些小块焦炭,我们把它压制成焦炭团。焦炭团必须具有足够的强度,为此,我们用水玻璃作粘结剂。由于水玻璃和空气中的 Co_2反应生成硅酸凝胶,具有自硬作用。团块中加入石灰石,以提高炉渣中 CaO 的含量,增加含有硅酸盐熔融物 SiO_2的炉渣的流动性。另外,炉渣的碱度提高,有利于脱硫,对碱性冲天炉还有利于降低铁水中的含磷量。石灰石还能提高团块在冲天炉内加热时的耐热性。
China used in cupola melting of coke up to 20 to 30%, and even more than 50 blocks less than 40 mm, can not be used for melting. In order to use these small coke, we pressed it into a coke group. The coke mass must have sufficient strength, for which purpose we use water glass as a binder. As water glass and air in the reaction of Co_2 silicate gel, with a self-hardening role. Limestone is added to the mass to increase the CaO content in the slag and increase the fluidity of the slag containing the silicate melt SiO_2. In addition, the slag alkalinity increased, is conducive to desulfurization, alkaline cupola is also beneficial to reduce the amount of phosphorus in molten iron. Limestone also improves the heat resistance of clumps when heated in a cupola.