Electrofused dense corundum is a new and superior refractory raw material，with a grayish-black appearance，low porosity，high density，acid and alkali resistance，corrosion resistance and volume stability，and is widely used in metallurgy、ceramics、chemical and other industries，making it an excellent raw material for producing ramming mixes and castables for blast furnace iron runners、long nozzles、slide plates and various corundum products。