Method of producing a refractory lining in a cylinder or tube

Claim 1

A method of producing an abrasion-resistant refractory lining in a cylindrical hollow metal article having an inner surface area to be lined, comprising: a. introducing into said metal article a predetermined quantity of an exothermic reaction mixture comprising a powdered fuel metal and a reducible metallic oxide powder, said powdered fuel metal being selected from the group consisting of aluminum, magnesium, silicon, calcium-silicon alloy and mixtures thereof; b. igniting said reaction mixture to form a reaction mass comprising a heavier, molten reduced metal phase and a lighter, molten slag phase, and subjecting said cylindrical article to a rotational movement about its longitudinal axis; c. continuing said rotational movement at a sufficiently slow velocity that centrifugal forces do not prevent the molten metal and slag phases from lying at the bottom of the rotating pipe, and continuing said rotational movement for a time sufficient to cause said slag phase to be deposited against the inner wall of said article, forming the desired abrasion-resistant, refractory lining over said surface, and thereafter removing said metal phase from said article.

Claim 2

A method of producing an abrasion-resistant refractory lining in a cylindrical hollow metal article having an inner surface area to be lined, comprising: a. introducing into said metal article a predetermined quantity of an exothermic reaction mixture comprising a powdered fuel metal and a reducible metallic oxide powder, said powdered fuel metal being selected from the group consisting of aluminum, magnesium, silicon, calcium-silicon alloy and mixtures thereof; b. igniting said reaction mixture to form a reaction mass comprising a heavier, molten reduced metal phase and a lighter, molten slag phase, and subjecting said cylindrical article to a rotational movement about its longitudinal axis; c. continuing said rotational movement at a sufficiently slow velocity that centrifugal forces do not prevent the molten metal and slag phases from lying at the bottom of the rotating pipe, and continuing said rotational movement for a time sufficient to cause said slag phase to be deposited against the inner wall of said article, forming the desired abrasion-resistant, refractory lining over said surface, and thereafter removing said metal phase from said article.