Abstract: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 increases, 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.
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