| 摘要 |
A porous sintered aggregate consists of a sintered product of a raw mixture comprising 1) a material the main components of which are carbon and the oxides of Si, Al, Fe and Ca in proportions: SiO2: 35-70 per cent; Al2O3: 15-35 per cent; Fe(calculated as Fe2O3): 3-30 per cent; CaO: 1-10 per cent; and C: 1-15 per cent; and 2) fine calcareous material. The composition of the raw mixture is such that the weight ratio of total CaO over total Al2O3 in the mixture lies within the range 0.35 - 1.00, the weight ratio of total SiO2 over total CaO is greater than 1.5, and the weight ratio of total SiO2 over total Al2O3 is greater than 1.0. A process for manufacture of such a product is described. |
