兰炭作烧结燃料对烧结矿冶金性能的影响

Influence of semi-coke used as sintering fuel on metallurgical properties of sinter

通过烧结杯试验、烧结矿荷重软化试验、烧结矿还原度试验及烧结矿低温还原粉化试验,系统地研究了兰炭用作烧结燃料对烧结矿冶金性能的影响。结果表明,兰炭的配加、碱度的增加对烧结矿的成品率、品位和转鼓指数及粒度并未产生明显的负面影响;兰炭加入比例为30%、碱度为1.82时,可以提高烧结矿的转鼓强度,此时的烧结矿软化性能也最好;随着兰炭替代比例的升高,烧结矿碱度逐渐增加,导致烧结矿中Fe O质量分数逐渐下降,这对烧结矿还原性和低温还原粉化具有一定的改善作用。综合考虑兰炭和碱度对烧结过程及烧结矿冶金性能的影响,用兰炭作为烧结燃料在工艺上是可行的,而且兰炭加入比例为30%、碱度为1.82时效果最佳。

Semi-coke used as sintering fuel was studied through the sintering cup experiment, sinter load softening experiments, sinter reduction test and low-temperature sinter reduction powder experiment. Emphasis was mainly focused on the influence of semi-coke substitution ratio on sinter metallurgical properties. The result shows that, the addition of semi-coke and the increase of basicity do not have obvious negative impact on the sinter yield, grade, the drum index and grain size. When the content of semi-coke is 30% and the basicity is 1.82, the drum strength as well as the softening property of sinter can improve. In addition, with the increase of semi-coke replacement ratio, the sinter basicity increas- es, leading to a decrease of the FeO content in sinter which is helpful for the sinter reducibility and low-temperature reduction disintegration. Considering the roles of semi-coke and alkalinity in sintering process and the influence of sinter metallurgical properties, the application of semi-coke as fuel in sintering process is feasible, and the optimum condition is 30% addition of semi-coke and the basicity of 1.82.