Method of comminuting ore material
AssigneeKrupp Polysius AG
InventorsNorbert Patzelt, Johann Knecht
Life of this patent
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Abstract
In this method of comminution according to the invention, pre-comminuted ore material is subjected to material bed comminution in a material bed roll mill. In order to achieve optimal comminution even of very different ore materials with a high throughput the ore material is pre-comminuted in an autogenous mill, whereupon at least fractions of fine material are separated out of the pre-comminuted material before the rest of the material is further comminuted in the material bed comminution.
Claims14
A method of comminuting fresh ore material comprising the steps of:
- pre-comminuting the material in an autogenous mill;
- separating the pre-comminuted material into relatively coarser and relatively finer fractions, the separation of the pre-comminuted material being carried out in a screening device by passing the material over a screen while treating the material with a spray of liquid in order to wash out as screenings the relatively finer fraction and any plastic and sticky material fractions from the remainder of the pre-comminuted material;
- delivering the relatively coarser fraction of the pre-comminuted material to a material bed roll mill and further comminuting such material in a grinding gap between two rolls of the roll mill;
- and
- separating the further comminuted material into relatively fine and relatively coarse fractions.
A method of comminuting fresh ore material containing constituents which characteristically hinder material bed comminution of such material, said method comprising the steps of:
- pre-comminuting the fresh ore material in an autogenous mill;
- separating the pre-comminuted fresh ore material into a relatively coarser fraction and a relatively finer fraction containing at least most of said constituents;
- delivering the relatively coarser fraction of the pre-comminuted fresh ore material to a material bed roll mill and further comminuting such material in a grinding gap between two rolls of the roll mill;
- and
- separating the further comminuted fresh ore material into relatively fine and relatively coarse fractions.
Dependencies are inferred from the claim text.