| 摘要 |
1427872 Stopper plug AIKOH CO Ltd 4 June 1974 [5 June 1973] 25280/74 Heading C1J [Also in Divisions F3-F4] A stopper plug for a converter taphole comprises a moulding of a refractory material, a fibrous substance and a binder. The refractory material is at least one of silica, quartz, magnesia, olivine, sand, mullite, aluminium, chamotte, alumina ash, dolomite, magnesite, limestone, fly ash, bauxite, diatomaceous earth, lapilli, expanded vermiculite, expanded shale, expanded obsidian, expanded perlite and expanded pitchstone. The fibrous substance is at least one of an inorganic fibrous material e.g. asbestos, rock wool, slag wool, glass wool and steel wool and an organic fibrous material, e.g. paper pulp, cotton, flax and synthetic fibres. The binder is at least one of a phenol-formaldehyde resin, a urea-formaldehyde resin, a furan resin, an epoxy-resin, dextrin, starch, water glass, cement or clay. The combustible material is at least one of wood powder, sawdust and coke or coal powder. |
