Solid material comminution or disintegration – Processes – By utilizing kinetic energy of projected or suspended material
Patent
1988-02-19
1989-11-07
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
By utilizing kinetic energy of projected or suspended material
241 14, 241 15, 241 40, 241 81, 241DIG30, B07C 1912
Patent
active
048786233
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process and device for mechanically removing the surfaces of lumped goods.
The surface of lumped goods has to be mechanically processed in a very wide variety of sectors of technology. It is partly a matter of removing a shell or a skin, either wholly or in part. This skin or shell may have the same material composition as the "core" of the piece, but it may also be a completely converse matter of removing an existing surface from another material.
An example in this context might be the peeling of fruit or cleaning of potatoes.
"Removal of the surfaces of lumped goods" also covers the removal of surfaces which do not form an independent constituent as such but for example display a chemical or mineral composition different from the remaining material (the core). An example of this area of application is the surface of a lumped lime produced from sulphurous fuels.
Large amounts of energy are required to execute the pyroprocess for producing lime. Basically very wide variety of energy carriers such as coal, coke and/or natural gas or petroleum are involved. Besides having a high thermal value natural gas is particularly noted for the fact that it is almost free of sulphur. Fuels such as coke or brown coal products (brown coal dust) on the other hand are highly sulphurous, which means for example that lime products resulting from the firing of brown coal have a sulphur content higher by the factor two to three than those produced from the firing of natural gas.
More extensive tests have shown that the sulphur load of the burnt lime product is extremely high particularly in the area of the surface, and is reduced considerably as the layer depth increases.
For use in the steel works sector, lumped limes with an S03 content less than 0.1% by weight and frequently less than 0.05% by weight are required. Concentrations of this kind cannot be achieved with solid sulphur fuels without appropriate (mechanical) after-treatment. A reduction in the sulphur content of the fuel is technically possible but too costly.
It is normally sufficient, with the concentration gradient over the core cross-section described above, to remove only a relatively thin surface layer. The major problem however is that the lumped lime is not in spherical or other symmetrical form, in particular with a smooth surface, but in a very wide variety of configurations, so that certain surface areas (particularly at the rear) are accessible only with difficulty.
An (unpublished) proposal is known for achieving "mechanical desulphurisation" by treating the goods in a cylindrical sieve, possibly provided with fittings which have an abrasive action. However a device of this kind has considerable disadvantages including the fact that, on the one a high degree of autogenous milling is caused, which leads to an undesirable production of broken surfaces (the steel industry requires lime of a specific grain spectrum).
Further, considerable amounts of solids have to be removed in order, for example to free the granular areas which are not immediately accessible as a result of depressions or dents, slits or pocket pores created by the increased areas alongside from the surface zones of high sulphur content. With particularly irregular goods, which are actually the norm in lime production, this can mean that up to 50% by weight or more has to be removed.
On the other hand, on grounds of cost etc. the use of the said sulphurous fuels has to be made possible.
Another (also unpublished) proposal provides for mechanical processing of the granular surfaces by means of sandblasting. With a tonnage product such as lime, which is also partially of relatively small lump size (steel works lime is generally of an order of magnitude between 10 and 60 mm) a process of this kind cannot be executed, and even surface treatment is problematical.
The object of the invention is to set out a possibility for processing lumped goods mechanically, to allow material to be removed as evenly as possible over the entire surface. The object is therefore--regar
REFERENCES:
patent: 3682397 (1972-08-01), Bodine
patent: 3827186 (1974-08-01), Ehnot
Friedrichs Reinhard
Machnig Helmut
Mischke Georg H.
Nahrmann Norbert
Plank Friedrich W.
A. Earley John F.
A. Earley III John F.
Rheinisch-Westfalische Kalwerke AG
Rosenbaum Mark
Walker P. Michael
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