Grinding process and mill for carrying out this process
AssigneeFcb
InventorsRene Durinck, Alain Cordonnier, Bernard Boussekey, Yves Verbaere
Life of this patent
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Abstract
The purpose of the invention is a process and a machine for the fine grinding of materials such as cement clinker. To improve the energy efficiency of the operation, by performing a systematic grinding, without resorting to excessively high pressures or excessively substantial recycling rates, there is used a mill composed of a rotating path and a roller capable of rolling on the path, exerting on the material by means of the roller an average pressure between 10 and 40 MPa and, on each turn of the path, the material is moved transversely on the latter over a distance which is a fraction of the width of the path.
Claims13
A process for grinding a material, which comprises the steps of
- (a) providing a circular grinding path having a horizontal axis and two axially spaced edges,
- (b) feeding the material onto the circular grinding path adjacent one of the edges,
- (c) rotating the circular grinding path about the horizontal axis at a speed higher than a critical speed to form a continuous layer of the material on the path,
- (d) rolling a roller over the continuous layer of material on the rotating circular grinding path and exerting a pressure comprised between 10 MPa and 40 MPa on the material by the roller, and
- (e) moving the material transversely from the one edge of the circular grinding path to the other edge thereof and so controlling the transverse movement that the material is displaced only over a fraction of the distance between the edges during each rotation of the path and passes several times under the roller before leaving the grinding path over the other edge.
A mill for grinding a material, which comprises
- (a) a circular grinding path having a horizontal axis and two axially spaced edges,
- (b) means for feeding the material onto the circular grinding path adjacent one of the edges,
- (c) means for rotating the circular grinding path about the horizontal axis at a speed higher than a critical speed required to form a continuous layer of the material on the path,
- (d) a roller capable of rolling over the continuous layer of material on the rotating circular grinding path,
- (e) means for pressing the roller against the continuous layer of material on the rotating circular grinding path with a force sufficient to exert a pressure comprised between 10 MPa and 40 MPa on the material, and
- (f) means for controllably moving the material transversely from the one edge of the circular grinding path to the other edge thereof and so that the material is displaced only over a fraction of the distance between the edges during each rotation of the path and passes several times under the roller before leaving the grinding path over the other edge.
Dependencies are inferred from the claim text.