Process for manufacturing a lightweight refractory product
AssigneeCawoods Refractories Limited
InventorsGraham K. Sargeant, Raymond E. Stone
Life of this patent
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Abstract
A process of making a highly porous yet relatively impervious refractory. The process includes taking a particulate pore-forming material or a mixture of refractory raw material with a particulate pore-forming material, providing the individual particles of the pore-forming material or agglomerates of the particles or agglomerates of the mixture with a wet exterior, coating said wet exterior with dry refractory raw material and firing the aggregate so produced.
Claims8
In a process for manufacturing a lightweight refractory product wherein bodies of particulate pore-forming material are coated with a refractory raw material and said coated bodies are then dried and subsequently fired in order to decompose said bodies of particulate pore-forming material and form hollow bodies of said refractory material, the improvement for providing a uniform coating of refractory material having a predetermined thickness on the bodies of particulate pore-forming material comprising the steps of:
- effecting a continuous tumbling motion of said bodies of particulate pore-forming material consisting essentially of polystyrene, said tumbling motion producing a continuous cascade of said bodies;
- spraying water onto said cascade of tumbling bodies in order to wet the exterior surface thereof and turning said tumbling bodies into a weakly coherent mass;
- and
- dusting said wet tumbling bodies with said refractory raw material, said dusting causing said weakly coherent mass to revert to separate particles;
- repeating the steps of spraying and dusting said tumbling bodies to produce a uniform coating of refractory material of the aforementioned predetermined thickness on said bodies of particulate pore-forming material.
Dependencies are inferred from the claim text.