Aluminum resistant refractory and method

In a refractory monolithic shape, the improvement comprising the addition of 0.2 to 1 wt.% polyvinyl chloride powder.

In a method of producing a refractory, the improvement comprising:

• adding 0.2 to 1 wt.% polyvinyl chloride powder.

A method of increasing the aluminum resistance of a refractory, comprising the step of:

• adding a small amount of a water-insoluble, chlorine-containing powder to the mix.

An aluminum resistant cement-bonded alumina castable consisting essentially of alumina calcines, calcium aluminate cement, and an amount less than 1 wt.% polyvinyl chloride powder.

An aluminum resistant castable consisting essentially of alumina calcines, submicron silica, calcium aluminate cement, less than 1 wt.% dry phosphate additive, and an amount less than 1 wt.% polyvinyl chloride powder.

A process of producing an aluminum resistant refractory shape comprising the steps of:

• mixing alumina calcines, calcium aluminate cement, an amount less than 1 wt.% polyvinyl chloride powder and water as required to form a castable mixture,
• casting a shape from said mixture, and
• heat treating said cast shape.

A process of producing an aluminum resistant refractory shape comprising the steps of:

• mixing alumina calcines, calcium aluminate cement, submicron silica, less than 1 wt.% dry phosphate additive, an amount less than 1 wt.% polyvinyl chloride powder and water as required to form a castable mixture,
• casting a shape from said mixture, and
• heat treating said cast shape.

In a refractory composition, the improvement comprising the addition of 0.2 to 1 wt.% polyvinyl chloride powder.