20140023781 | Methods of Use of Calcium Hexa Aluminate Refractory Linings and/or Chemical Barriers In High Alkali or Alkaline Environments - A method for improving the insulating character/and or penetration resistance of a surface comprising lining a surface of a lime kiln, a cement kiln, a roasting kiln, a thermal oxidizer, or a fluidized bed reactor that is subject to wear by an alkali environment and/or an alkaline environment with a refractory composition comprising a refractory aggregate consisting essentially of a calcium hexa aluminate clinker having the formula CA | 01-23-2014 |