Apparatus for separating off light materials from sand and grave

Details Apparatus for separating off light materials from sand and grave Apparatus for separating off light materials from sand and grave

1998-06-12

2000-03-14

Walsh, Donald P.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

209208, 209210, 209726, 209 18, 209733, B04C 512, B03D 560, B03B 700

Patent

active

060360283

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to an apparatus for separating out light materials from mineral raw materials, especially from sand and gravel, and includes a charging means for the raw material, an inner chamber, as a coarse sand chamber, for separating out the coarse sand, and with an outer chamber, as a fine sand chamber, that serves for the sorting out of the fine sand pursuant to the fluidized bed process, with this outer chamber communicating with the coarse sand chamber via an overflow embodied as an inclined surface, as well as an overflow for the light materials associated with the outer chamber, whereby the charging means includes a charging tube that ends centrally above an impingement body that is centrally disposed in the inner chamber and leaves free an outer annular gap.
An apparatus of this general type is described in EP 0 508 335 A2; by means of the configuration described therein, the known apparatus intends to avoid the pretreatment of the raw material charge, so that it is possible to directly supply the raw material coming from the extraction or the screening into the separating apparatus. However, in doing so large quantities of water in the charge can have a disadvantageous effect, since such large quantities of water cause great hydraulic stress of the coarse sand chamber and therefore either material that is too coarse is transported into the fine sand chamber or fine sand substituents are carried along beyond the fine sand chamber into the light material overflow.
It is therefore an object of the present invention to improve an apparatus having the aforementioned features such that larger quantities of water that pass, even in an abrupt manner, into the separating apparatus with the material charge can be managed without having an adverse effect upon the separation success of the apparatus.


SUMMARY OF THE INVENTION

The realization of this object, including advantageous configurations and embodiments of the invention, result from the content of the patent claims that follow this specification.
The basic concepts of the invention are that a charging tube has an eccentrically arranged inlet for the tangential introduction of the raw material charge, and at its end remote (opposite) from the impingement body the charging tube has an overflow chute, and a perforated basket, for adjusting the flow resistance, bridges the space between the end of the charging tube and the impingement body, with the perforated basket being displaceable in the tube axis, whereby depending upon the precision of separation or separation particle size of the overflow of the charging means, which is adjusted by modifying the position of the perforated basket, the overflow chute communicates either with the fine sand chamber or with the light material overflow.
The present invention has the advantage that due to the configuration of the raw material inlet in the manner of a cyclone, a separation of the overflow water including fine and very fine particles results; the particle size of the solid material particles that pass into the overflow chute with the overflow water is adjustable by means of the perforated basket that is additionally disposed between the end of the charging tube and the impingement body, whereby with the help of the impingement body the flow resistance for the raw material charge can be regulated as a measure for the counter pressure that fixes the interface (for separation particle size) of the inlet, which has a cyclone-type configuration. Depending upon the setting of the interface for the cyclone-type inlet, the overflow chute can be connected either with the fine sand region, which results in the advantage that a good production is provided with a partial relief of the coarse sand chamber from the fine sand charge, or the overflow chute can communicate directly with the light material overflow so that the overflow water, including the sludge-like very fine substituents, is directly drawn off accompanied by relief not only of the coarse sand chamber but al

REFERENCES:
patent: 3061098 (1962-08-01), Brezinski
patent: 3905894 (1975-09-01), Hukki
patent: 4253942 (1981-03-01), Gaumann
patent: 4352732 (1982-10-01), Massicotte
patent: 5074719 (1991-12-01), Davies
"Eindick-und Klassiervorrichtung"; Apr. 22, 1965; pp. 1-9; Dr. Hubert Heigl .

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