Classifying – separating – and assorting solids – Stratifiers – With liquid treatment
Patent
1989-12-26
1991-03-05
Hajec, Donald T.
Classifying, separating, and assorting solids
Stratifiers
With liquid treatment
209 44, 209435, 209485, 209503, B03B 502
Patent
active
049975510
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates generally to the mining industry, and more particularly to a concentrator for beneficiating minerals by gravity.
BACKGROUND OF THE INVENTION
For obtaining reliable results of sample processing a highly accurate sample cleaning procedure must be followed to ensure that during rinsing the sample water could not entrain some of the sample material. With this aim in view, the base of the concentrator should be set strictly horizontally. Taking into account the fact that one of the major advantages of the concentrator is amenability to mounting on the wing of a drilling rig operating in locations with rugged terrain, it is impossible to position the concentrator horizontally and therefore obtain reliable sample test results.
There are known rotary separator (concentrators) for beneficiating minerals, particularly gold, operating on the principle of concentrating heavy metals or minerals, and comprising a base with a hub, and a beneficiating member with a discharge hole mounted on a shaft of the drive mechanism.
The drive mechanism is fashioned as a hollow drive shaft journalled in bearings in the base hub and accommodating with an eccentricity on bearings a shaft of the beneficiating member rotating about a circle of a radius equal to the eccentricity. The beneficiating member has the form of a bowl provided with riffles at the inner surface thereof, and the discharge ports. The separator also has a breaking mechanism in the form of brake disks, a system of levers and elements closing the discharge ports in the bottom.
However, accurate cleaning of the sample requires here that the base of the separator be positioned strictly horizontally. In addition, washing the concentrate from the space between the riffles when using hard-to-wash materials necessitates stopping of the separator and thorough cleaning of the riffles, which makes the washing process labour- and time-consuming.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a concentrator for beneficiating minerals of such a construction as to obviate the washing procedure, while enabling to obtain reliable results under any operating conditions of the concentrator and affording a reduction in the time consumed for treating the sample and amount of labour consumed for the process.
The object is attained by that in a concentrator for beneficiating minerals comprising a beneficiating member in the form of a bowl with a tapered bottom a concavity of which has a discharge hole, a base with a hub, and a drive mechanism including a hollow drive shaft journalled in bearings in the base hub, the hollow drive shaft accommodating eccentrically in bearings a shaft of the beneficiating member executing a circular movement about a radius equal to the eccentricity, according to the invention, the bowl has an elliptical cross section and is connected to the base by flexible elements, whereas the concavity of the tapered bowl bottom is offset relative to the bowl shaft, a tray for finishing concentration being accommodated on the bowl under the discharge hole of the concavity.
The elliptical shape of the beneficiating member and the offset concavity increase the travel path of the material being beneficiated, and thereby improve conditions for settling of the material at the bottom of the beneficiating member. As distinct from the prototype, the concentrate is discharged continuously by sliding to the concavity, which reduces the time for processing the sample and makes the procedure less labour consuming. The aforedescribed allows to dispense with washing as a separate operation.
Securing the beneficiating member, viz., the bowl, to the base by means of flexible elements prevents this member against rotation about its own axis to result in that the member moves about a circle of a radius equal to the eccentricity in a jolting manner. All the elements of the beneficiating member are immovable relative to each other, whereas the material of the sample moves in a jolting fashion about the perimete
REFERENCES:
patent: 829493 (1906-08-01), Thurston
patent: 1286111 (1918-11-01), Robertson
patent: 4162969 (1979-07-01), Lagal
patent: 4273648 (1981-06-01), Legg
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