Temporary sealant of a nozzle opening of sliding nozzle

Claim 1

A composition adapted to be used as a temporary sealant in a nozzle opening which consists essentially of 92.0 to 98.8% by weight of at least one non-porous refractory material selected from the group consisting of siliceous sand, peridotite, chamotte, brick powder, bauxite, alumina, chromite, magnesia, dolomite, magnesite and spinel, said refractory material having a particle size distribution of more than 95% of said particles having a diameter ranging from 0.8 to 2.0 mm; 1 to 5% by weight of at least one carbonaceous material selected from the group consisting of graphite, coke, soot, charcoal, semi-coke and anthracite, said carbonaceous material having a particle size of less than 0.15 mm; and 0.2 to 3.0% by weight of at least one organic tackifier selected from the group consisting of starch, dextrin, sugar, mennan, algae starch, vegetable mucilage, glue, carboxy-methylcellulose, polyvinylates, polyvinyl alcohol, thermo-plastic resins, thermo-setting resins, cold-setting resins, pitch, asphalt, tar, heavy oil, caking coal, animal and plant drying oils.

Claim 4

A method of producing a composition adapted to be used as a temporary sealant in a nozzle opening including the steps of: coating particles of a refractory material selected from the group consisting of siliceous sand, peridotite, chamotte, brick powder, bauxite, alumina, chromite, magnesia, dolomite, magnesite and spinel, said refractory material having a particle size distribution of more than 95% of said particles having a diameter ranging from 0.8 to 2.0 mm with at least one carbonaceous material selected from the group consisting of graphite, coke, soot, charcoal, semi-coke and anthracite, said carbonaceous material having a particle size of less than 0.15 mm; and forming the resultant mixture into the desired shape.

Claim 5

A method of producing a composition adapted to be used as a temporary sealant in a nozzle opening including the steps of: coating particles of a refractory material selected from the group consisting of siliceous sand, peridotite, chamotte, brick powder, bauxite, alumina, chromite, magnesia, dolomite, magnesite and spinel, said refractory material having a particle size distribution of more than 95% of said particles having a diameter ranging from 0.8 to 2.0 mm with at least one carbonaceous material selected from the group consisting of graphite, coke, soot, charcoal, semi-coke and anthracite, said carbonaceous material having a particle size of less than 0.15 mm; and forming the resultant mixture into the desired shape.

Claim 8

A method of temporarily sealing a nozzle opening in a vessel adapted to contain molten metal comprising: (a) placing in the nozzle being sealed so as to close the passage therethrough a sealant which consists essentially of 92.0 to 98.8% by weight of at least one non-porous refractory material selected from the group consisting of siliceous sand, peridotite, chamotte, brick powder, bauxite, alumina, chromite, magnesia, dolomite, magnesite and spinel, said refractory material having a particle size distribution of more than 95% of said particles having a diameter ranging from 0.8 to 2.0 mm; 1 to 5% by weight of at least one carbonaceous material selected from the group consisting of graphite, coke, soot, charcoal, smi-coke and anthracite, said carbonaceous material having a particle size of less than 0.15 mm; and 0.2 to 3.0% by weight of at least one organic tackifier selected from the group consisting of starch, dextrin, sugar, mennan, algae starch, vegetable mucilage, glue, carboxy-methylcellulose, polyvinylates, polyvinyl alcohol, thermo-plastic resins, thermo-setting resins, cold-setting resins, pitch, asphalt, tar, heavy oil, caking coal, animal and plant drying oils; (b) placing molten metal in said vessel in contact with at least a portion of said sealant; and (c) permitting said molten metal to cause said carbonaceous particles to burn and subsequently open the passage in said nozzle.

Claim 9

A method of temporarily sealing a nozzle opening in a vessel adapted to contain molten metal comprising: (a) placing in the nozzle being sealed so as to close the passage therethrough a sealant which consists essentially of 92.0 to 98.8% by weight of at least one non-porous refractory material selected from the group consisting of siliceous sand, peridotite, chamotte, brick powder, bauxite, alumina, chromite, magnesia, dolomite, magnesite and spinel, said refractory material having a particle size distribution of more than 95% of said particles having a diameter ranging from 0.8 to 2.0 mm; 1 to 5% by weight of at least one carbonaceous material selected from the group consisting of graphite, coke, soot, charcoal, smi-coke and anthracite, said carbonaceous material having a particle size of less than 0.15 mm; and 0.2 to 3.0% by weight of at least one organic tackifier selected from the group consisting of starch, dextrin, sugar, mennan, algae starch, vegetable mucilage, glue, carboxy-methylcellulose, polyvinylates, polyvinyl alcohol, thermo-plastic resins, thermo-setting resins, cold-setting resins, pitch, asphalt, tar, heavy oil, caking coal, animal and plant drying oils; (b) placing molten metal in said vessel in contact with at least a portion of said sealant; and (c) permitting said molten metal to cause said carbonaceous particles to burn and subsequently open the passage in said nozzle.