Method and roll mill for drying and grinding moist feed material

摘要

The invention relates to the drying and grinding of moist feed material in a vertical roll mill, in which the moist feed material is delivered to a grinding table (7) by way of a fresh material inlet, comminuted material is conveyed into a separator (4) by a rising hot gas stream and is dried thereby and from it tailings are separated off and returned to the grinding table. In order to be able to ensure a reliably operating delivery of fresh material (13) to the grinding table (7) substantially without incrustation a predrying of the moist feed material (13) is carried out in the fresh material delivery arrangement (12) in the region before the grinding table by on the one hand introducing hot gas into the fresh material delivery arrangement and on the other hand admixing tailings (16) coming from the air separator (4) with the fresh feed material.