| 摘要 |
<p>For the production of a product which can be dumped or utilized, the mineral substances are subjected in a rotary kiln to a thermal treatment at a temperature at which the charge of the rotary kiln is transformed to a pasty to liquid slag phase. The composition of the charge is so selected that a slag phase is produced in which the main components, which constitute a matrix, are in the range from 60 to 72% SiO2, 10 to 30% Al2O3 and 5 to 25% CaO+MgO, of said matrix, wherein the total percentage of SiO2+Al2O3+CaO+MgO equals 100, the total of the main components SiO2, Al2O3, CaO and MgO amounts to more than 60% on a dry and ignition loss-free basis, of the mineral matter which is charged to the rotary kiln. The slag phase discharged from the rotary kiln is cooled and the exhaust gas from the rotary kiln is purified.</p> |
