| 摘要 |
<p>1,158,208. Refractory material. JOHN G. STEIN & CO. Ltd. 21 Feb., 1968 [2 March, 1967; 2 May, 1967], Nos. 9923/67 and 20351/67. Heading C1J. A mixture of 50-95 wt. per cent of a hard material, e.q. quartz sand, bauxite, or crushed refractory brick, a flux and 2-8% of ground coke breeze is sintered at 900-1500‹ C. to yield a porous material which can be crushed for road-surfacing. Suitable fluxes are limestone, dolomite, clay, and fluorspar, which may be calcined before use, and may include glass. Sands containing clay or felspar may be used to provide both flux and hard material. The charge of hard material, e.g. particles of size 100 B.S. mesh to 0À5 inch, and flux can be agglomerated prior to sintering, e.g. in a moving grate with air drawn through the bed.</p> |
