Plant for the treatment of powders, or granules, in particular o

Details Plant for the treatment of powders, or granules, in particular o Plant for the treatment of powders, or granules, in particular o

1995-10-17

1998-03-03

Theisen, Mary Lynn

Plastic article or earthenware shaping or treating: apparatus

Miscellaneous

425222, 23313FB, 264117, 422139, 422140, B01J 216, B29B 908

Patent

active

057231605

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



Field of the Invention

This invention relates to processing plants for powders and granules, and more particularly to such plants includes containers for powders or granules with associated filters that can be readily replaced or serviced in convenient manner.
The state of the art comprises silos, generally cylindrical in shape, for the storage of powdery or granular materials, such as, for example, cement, flour, cereals or other substances, that have, on their top side, filter units through which, during the filling phase, a current of pressurized air containing the material that is to be placed in the silo is made to pass, using the known techniques of pneumatic transportation of loose products.
The state of the art also comprises plant for the agglomeration of powdered materials consisting of an agglomeration chamber, the sides of which are made up of a cylindrical casing, with, at its lower end, a detachable basket, fixed with a sealing coupling, that contains the material to be agglomerated; a dispenser for atomized binding liquid is positioned inside the agglomeration chamber, to spray the product for a predetermined interval of time, depending on the dimensions of the granules required and on the type of product: the product is sprayed when a stream of heated air is forced upwards through the perforated basket, causing it to be blown around inside the chamber; the air is then made to pass through filter units positioned at the top end of the agglomeration chamber for its subsequent expulsion into the atmosphere.
With both the ensilation plants and the powder or granule agglomeration plants, however, the substitution and cleaning of the filter units is a somewhat awkward and onerous operation.
In fact, the task involves the operator, after having lifted the closing cover, or cap, accessing a support plate for the filters from above in order to remove them, lowering them and subsequently cleaning them; alternatively, when the said support plate is fixed to the casing itself, and it being possible to remove the filters from below the support plate, the operator, whilst being facilitated in the removal of the filters, is unable to avoid the precipitation of the residue filtered out by the filters; this signifying that the operator is inevitably contaminated with the product, which can sometimes represent a health hazard, especially in the case of powders used in the preparation of chemical or pharmaceutical substances.
Furthermore, in the case of the agglomeration plants, the centering of the basket in relation to the bottom edge of the agglomeration chamber is extremely precarious, consequently requiring expensive and encumbering auxiliary centering mechanisms in order to prevent the powder from escaping.
The state of the art also involves agglomeration methods in which a heated stream of air is passed upwards through the powder, causing it a substantially vertical fluctuating motion, or fluidizing it, inside an agglomeration chamber; above the fluctuating mass, or liquid bed, a binding liquid is atomized which agglomerates the particles of powder by hydrating the granules by their coalescing with nuclei of larger dimensions, formed at random inside the fluctuating mass; the supply of the atomizing liquid being interrupted after e set time, proportional to the dimensions of the agglomerated particles required.
The flow of heated air is generally only interrupted after another set interval of time has passed sufficient to dry out the agglomerated particles: in this way unwanted sticking together of damp particles that would give rise to uncontrolled variations in the dimensions of the resulting product is avoided. At the end of the drying phase, the product is extracted from the agglomeration chamber and the cycle is repeated with the successive load of powder; alternatively, if the size of the granules needs to be increased beyond that which is obtainable in a single agglomeration cycle, the granules are once again blasted by the stream of heated air and sprayed with th

REFERENCES:
patent: 4027624 (1977-06-01), Motoyama
patent: 4797271 (1989-01-01), Fleming et al.
patent: 4832700 (1989-05-01), Kaspar et al.

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