Method and device for output of mineral material from a drum mill

摘要

The invention concerns a method and an arrangement for the output of mineral material from a drum mill having a horizontal rotation axis, a sieving wall at its end wall, material can leave through the sieving openings in to pulp-lifting chambers, limited by the sieving wall, the end wall, a limiting wall, and limiting walls that lead towards an output cone, whereby material in the pulp-lifting chamber is emptied down towards the output cone when the pulp-lifting chamber is an upper part of a revolution. In order to increase the rate of revolution, material that does not reach the material output cone is collected in a material collection pocket which carry the material at a level radially closer to the rotation axis than the inner limiting wall, whereby collected mineral material leaves the material collection pocket during, a subsequent revolution.

主权项

1. An arrangement for the output of mineral material from drum mills that can be rotated around a principally horizontal rotation axis and of the type that has a sieving wall arranged inside the drum at its output end or end wall, at which milled mineral material can leave through the sieving wall through sieving openings distributed over a major part of its extent in order to be led in to a number of pulp-lifting chambers distributed around the rotation axis, limited by the sieving wall, the said end wall, a limiting wall turned in to face the rotation axis, and limiting walls that are set radially relative to the rotation axis and that transport material, which limiting walls lead towards a central material output cone by sides that converge towards each other, whereby mineral material that is taken into the pulp-lifting chamber during a lower part of a revolution is emptied down towards the material output cone when the pulp-lifting chamber is located at an upper part of a revolution, characterized in that the pulp-lifting chamber comprises a first capture arm that extends from the radially set limiting wall of the pulp-lifting chamber to define and limit a material collection pocket with an opening that faces in towards the rotation axis and a second capture arm that is arranged at the pulp-lifting chamber at a radially different distance from the rotation axis of the mill compared to the first capture arm, whereby the material collection pocket is located at a level that lies radially closer to the rotation axis than the limiting wall of the pulp-lifting chamber that is located at the farthest radial extent and so designed that mineral material that has not had sufficient time to reach the material output cone during the emptying process of the pulp-lifting chamber but returns into the output arrangement is collected in the material collection pocket during the lower part of the revolution in order to leave the pocket during a subsequent revolution.