Experimental Study on the Resource Utilization of Carbide Slag in Iron Ore Sintering Process

Limestone or quicklime is a necessary flux in the iron ore sintering process. Its production and application process will cause CO2 emissions and various environmental pollution, but this has not attracted enough attention. Carbide slag (CS) is a calcium-rich solid waste produced in acetylene production, most of which is still stacked and buried at present, resulting in soil and groundwater pollution. This study investigated the granulation characteristics and sintering performance of the sintering mixture with different proportions of CS. The results show that the replacement of limestone with appropriate proportion of CS is beneficial to the formation of high-quality bonding phase. When CS accounts for 75% of the total mass of CS and limestone, the tumbler index increases by 8.10% and the comprehensive index decreases from 100 to 96.16, which is within the acceptable range. The resource utilization of CS is still a promising way to reduce carbon emissions, but how to avoid its negative impact on production efficiency needs further research