PROCESS AND PLANT FOR THE THERMAL TREATMENT OF TRICKLING MATERIAL CONTAINING ALUMINOSILICATE, AND SWELLABLE OR RENDERED SWELLABLE

摘要

In the thermal process for treating swellable granulates of clay or the like, the granulates are entered in heaps (4) with free intervals between them into a shaft (1) and traverse said shaft (1) by stages from top to bottom. The heaps (4) are supported by grates (2) of which the bars may be temporarily and at least taken out from the plane of the grate (2) so that the various heaps (4) are fed in the form of a temporarily regulated trickling flow to the next stage, so that a constant thickness with respect to the cross-section is maintained. In the various stages, the heaps (4) are traversed by hot gases introduced sideways into the shaft (1) and exhausted on the other side according to a direction perpendicular to the plane of the layer. In the upper stages of the shaft a preheating is carried out, while, at least in the lower stages, a preswelling of the granulates is effected with gases at different temperatures and a chemical combination with advantageous thermal transfer and high fluid mechanics efficiency.