热压铁焦对高炉综合炉料熔滴性能的影响

Effect of Iron Coke Hot Briquette on Softening-Melting and Dripping Properties of Blast Furnace Mixed Burden

利用荷重还原软化熔融滴落实验研究了热压铁焦添加量对高炉综合炉料滴落性能的影响.研究结果表明,随着热压铁焦配比的增加,综合炉料软化区间逐渐加宽,从206.3℃增加到218.9℃;熔化区间逐渐收窄,从171.1℃降低到124.8℃,软熔带逐渐变窄且位置下移;综合炉料滴落压差下降,滴落率先升高后降低,在热压铁焦配比为30%时达到较高值40.58%;综合炉料熔滴总特征值逐渐降低,料层透气性改善.一定量的热压铁焦有助于改善综合炉料熔滴性能,其适宜添加量在30%左右.

Through the experiment of softening-melting and dripping of iron ore with load reduction,the effect of iron coke hot briquette（ICHB） on softening-melting and dripping properties of blast furnace mixed burden was investigated.The results showthat,with the increase of ICHB adding ratio,the softening temperature range is increased from 206.3 ℃ to 218.9 ℃,while the melting temperature range is decreased from 171.1 ℃ to 124.8 ℃.The cohesive zone becomes narrower and tends to move downwards.Besides,the dripping pressure drop is decreased.The dripping ratio is increased first and then decreases,the superior value of which is40.58% when the ICHB ratio is 30%.In addition,S-value is decreased,which indicates that the permeability of mixed burden is improved.Therefore,a certain amount of ICHB is beneficial for improving softening-melting and dripping properties of mixed burden and the appropriate adding ratio of ICHB is about 30%.