The refractory matching of the inner linning in 1 300 t iron mixer furnace and the fireclay for masonry were optimized.The slag line parts of the lower part of the end wall and the front and rear walls of the mixer side,which were seriously eroded inside the mixer furnace,were repaired and casted by using aluminum silicon carbide castable,thus effectively prolonging the service life of the mixer furnace for 8 months.The lining repair and casting technology has the advantages of simple operation process,reduced refractory consumption and low cost.