28-35 parts of white alumina fine powder, 25-30 parts of ferrochrome slag, 10-15 parts of magnesium titanate, 10-13 parts of aluminum titanate, etc. The rotary kiln castable binder has a longer service life for the castable. The proportion is 28-35 parts of white alumina fine powder, 25-30 parts of ferrochrome slag, 10-15 parts of magnesium titanate, and 10-13 parts of aluminum titanate. parts, 9-12 parts of zinc ferrite, 5-8 parts of forsterite, 30-45 parts of bauxite, 8-12 parts of alumina powder, 3-6 parts of enstatite, 2-zirconium aluminum nitride 5 parts, calcium zircoaluminate 1-3 parts, sodium hexametaphosphate 0.3-0.6 parts, methallyl alcohol polyoxyethylene ether 0.1-0.2 parts.