Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1990-02-28
1991-10-22
Eley, Timothy V.
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 24, 241 29, B02C 2310, B02C 2312
Patent
active
050588133
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for comminuting brittle material to be ground according to the preamble of claim 1.
BACKGROUND OF THE INVENTION
Such a continuous method is known from EP 30 09 229 A1. This prior art method in particular aims at improving a comminuting method as described in EP 0 084 383 A1, whereby in the latter method a single grain and material bed comminution takes place. This improvement is in particular that the ground material agglomerates present after material bed comminution undergo disintegration. This seeks to remove the fines contained in the agglomerates by means of a classifying process, so that the overall process can be made more economic, whilst incorporating the following further comminution.
The material bed roller mills conventionally used for simultaneous single grain and material bed comminution have the advantage that they permit relatively fine-grain grinding and particles of 2 mm can be obtained. However, apart from the aforementioned disadvantage of agglomeration, an even greater disadvantage is that coarser ground material particles pass through the material bed roller mill. In addition, compared with other mills or crushers, a material bed roller mill requires relatively high capital costs.
The coarse particles passing through the material bed roller mill make it necessary for the e.g. following comminution by means of a gravity mill and in particular a tube mill to have relatively large diameter grinding elements. Large steel balls are consequently made necessary by the coarse particles passing through a material bed roller mill. In addition, in the case of the tube mill following the material bed roller mill it has been necessary to work with filling levels of approximately 26 to 30%, particularly because on reducing the filling level to e.g. 20%, there is a risk of the relatively coarse steel balls with such a low filling or grinding level shattering the jacket armour plates, as well as the slotted and front plates.
These disadvantageous aspects of the operation of a material bed roller mill and the necessary grinding element size, whilst also taking account of the degree of filling, have led to a comparatively poor efficiency with respect to the overall energy consumption, as in known installations.
SUMMARY OF THE INVENTION
The problem of the present invention is therefore to so further develop the aforementioned method that the specific energy requirement for a specific grinding material quantity is improved and the overall economic aspect is greatly improved by considerably reducing the capital costs, whilst also giving flexible method realization.
The essence of the invention is that the first comminution process of the material to be ground is no longer carried out with a relatively expensive material bed roller mill, but is instead carried out with a primary crusher and in particular a centrifugal crusher. When using such a primary crusher, one deliberately takes account of the fact that the ground material particles leaving the same are not as finely broken up as e.g. in a material bed roller mill. However with the marked reduction in the coarse or oversize material, less very fine material is produced, which would otherwise hinder the comminution of the coarse material by its cushioning action in a second comminution stage. This eliminates the hitherto serious disadvantage that relatively large particles have to be supplied to the following working stages in a fine material bed.
By means of this measure of obtaining a clearly defined feedstock at the primary crusher outlet, but which is not too fine, it is possible in a second comminution stage for which a ball or tube mill with grinding elements is particularly suitable, the diameter of the grinding elements used can be kept smaller, the precomminuted material can be stressed in a planned manner and consequently the degree of filling can be reduced.
Thus, it is e.g. possible in the case of a clearly defined oversize material smaller than 3 mm at the outlet of the centrifugal crusher used as th
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patent: 4783012 (1988-11-01), Blasczyk et al.
Thomas Franz
Weit Herbert
Christian Pfeiffer Maschinenfabrik GmbH & Co. KG
Eley Timothy V.
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