Research on Appropriate Additives of Recycling Ladle Lining Materials for Al<sub>2</sub>O<sub>3</sub>-SiC-C Iron Runner Castable

Abstract

In this experiment, preparation of samples were based on original ratio of bauxite matrix Al2O3-SiC-C castable for iron runner, and partial bauxites of size 8-5 mm, 5-3 mm, 3-0 mm and <0.074 mm were replaced by the same size granular recycling Al2O3-MgO-C materials from spent ladle bricks, respectively. Si3N4 and B4C were introduced as appropriate additives. Effects of their amount on the performance of Al2O3-SiC-C castable for iron runner were investigated by testing on physical properties and erosion resistance of the samples after sintering. The results showed that the introduction of Si3N4 and B4C led to high temperature flexural strength of the recycled castable samples decline, while the right amount could improve the room temperature flexural and pressure strength along with the erosion resistance to blast furnace slag. When introduced 3% of Si3N4and 0.3% of B4C respectively, the comprehensive performance of the samples were the best.