Compound Use of Chemical Waste as Flux in Iron Ore Sintering

With the accelerated development of the polyvinyl chloride materials industry, a large amount of carbide slag (CS) chemical waste, which has negative impacts on the environment, has been produced during the process, the further use of which has become a major issue that limits industrial development. This article investigated the compound use of CS as a flux material in the iron ore sintering process. The feasibility of replacing conventional flux quicklime with CS during the sintering process was discussed by evaluating the chemical and mineral characteristics of CS and by analyzing the effect of CS content (0 to 7.7 wt pct) on the sinter product. The tumbler strength of sinter increases from 71.33 to 74.67 pct as the CS content increases from 0 to 4 wt pct; because of the formation of fine calcium ferrite and dense interwoven structure, the yield and average particle sizes of sinter show the same trend. The addition of 6 wt pct CS would increase the amount of hematite phase and the softening temperature of sinter. Both the quality of sinter and compound use of CS can be ensured by adding about 4 wt pct CS, while adding 7.7 wt pct CS would cause the performance deterioration of sinter.