| 摘要 |
<p>A method and apparatus for producing cement which includes intermixing the cement forming raw materials with water, coal or coke and cement as a binder and forming this mixture of materials into nodules by pelletizing or extrusion. The system is particularly designed for use in making white cement where raw materials low in coloring compound are used as raw feed. The nodules are then sized to obtain a feed material having a size range on the order of 6,35 mm by 14 mesh which is suitable for thermal processing in a fluidized bed reactor (50) at temperatures in the range of approximately 1371 DEG C to 1482 DEG C for white cement and 1288 DEG C to 1443 DEG C for typical gray Portland cement. The coal or coke mixed with the raw material serves to supply between 60% and 90% of the fuel required for the process with the remainder being supplied directly to the fluidized bed.</p> |
