Binders and Bonding Mechanism for RHF Briquette Made from Blast Furnace Dust

Blast furnace dust is a kind of solid waste that produced in the process of iron smelting and it contains large amount of Fe and non-ferrous metal elements. It's not only a very good Fe-contained resource, but also a very important non-ferrous metal resource. Application of blast furnace dust to RHF (Rotary Hearth Furnace) briquette is an effective and comprehensive utilization method. However the strength of the briquettes is low, therefore the application of binder to the briquette should be developed. In this study, physical and chemical characteristics of blast furnace dust were investigated firstly. And the experiments of different binder used in the briquettes were studied. Then the bonding mechanisms of binders were discussed. The experiment results showed that different binder has different bonding mechanism of the briquettes. According to the application effect of binders, it should be priority to use the composite binder, and the excellent collocation pattern is starch binder together with silicon-containing binder, such as sodium silicate.