Abstract:Modified binder consists of modified pitch and coal tar mixed with boron carbide powders. Ramming paste was synthesized applying modified binder and calcined anthracite coal, coal derived pitch coke, baked scrap as aggregates. Effect of B4C addition on properties and microstructure of ramming paste were investigated. The results indicate that increasing addition of B4C, results in rises of ash, electrical resistivity, compressive strength and carbon yield, and drops of volatile matter and expansion/shrinkage. Obtained through high temperature chemical reaction between B4C and small molecular compounds such as O2, CO, B2O3 can reduce volume change and weight loss rate of ramming paste, and improve compact degree of binder coke. The optimal comprehensive properties of ramming paste are obtained with addition of B4C of 3%.