| 摘要 |
Described is filter matting (20) for reversible-flow filter, the matting having layers with decreasing mesh size disposed on a rigid base (21). The matting layers are joined to each other and to the base preferably by means of sintered joints and hence braced with respect to each other. Particularly preferred is the use of such filter matting in the operation of a pressure filter which can be fitted with equipment for automatically removing the filter cake. Because of the rigid nature of the filter matting, a reverse flow can be established using a liquid or gaseous flushing agent to detach the filter cake rapidly and completely, without the filter matting being distorted or torn open. Any residual layer of filter cake is removed by using a swirling flow. The use of heated gaseous flushing agent enables the filter cake residues to be dried more rapidly. |
