| 摘要 |
<p>The production of bricks involves forming a pressing mixture of granular heat treated clay-containing material, 5-10 wt.% clay, inert filler, brown coal flyash of up to 500 mu m maximum particle size and water and pressing the moist mixture (especially in a lime sandstone press) at 15-30 N/mm<2> to form individual stable raw mouldings which are dried and fired. The pressing mixture is produced from 30-60 wt.% of a quenched fraction of a brown coal flyash which swells before melting during firing, 30-65 wt.% of ground brick-rich rubble of 1 mm maximum particle size and≥20 wt.% heat treated clay mineral content, as well as the clay. Firing is carried out at 1080-1160 (preferably 1100-1130) degrees C, which is below the melting temperature of the flyash fraction. The proportions of the flyash fraction and the brick content of the ground rubble are such that the swelling of the former compensates the shrinkage of the latter.</p> |
