Classifying – separating – and assorting solids – Plural – diverse separating operations – Sifting and stratifying
Patent
1989-12-13
1991-08-27
Song, Robert R.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Sifting and stratifying
209439, 209504, 209506, B03B 700
Patent
active
050430599
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
When carrying out such operations it is essential to ensure a high degree of recovery (concentration) of the material being beneficiated, including materials containing large quantities of base minerals, such as pyrite, granite, magnetite. The same degree of recovery is essential during the treatment of initial materials containing high amounts of dust gold. Another requirement is to mechanize the processing stages and reduce labour intensity.
There are known rotary separators for beneficiating minerals, particularly gold (SU, A, 700,975 and 809,692) operating on the principle of concentrating base metals or minerals and comprising a base with a hub, a beneficiating member with a discharge hole, and a drive mechanism. The drive mechanism has the form of a hollow drive shaft journalled in bearings in the base hub and accommodating with an eccentricity in bearings a shaft of the beneficiating member travelling about a circle of a radius equal to the eccentricity. The beneficiating member is fashioned as a bowl having riffles at its inner surface.
However, the degree of concentration of metal, particularly gold, in this separator during beneficiating the initial material containing substantial amounts of gold and thin slices of gold is insuffucuent. For this reason, it is necessary to carry out repeated refining of the product, which makes the operation more labour- and time-consuming. Another disadvantage is the tendency of the bowl riffles to clog under the action of centrifugal forces when large amounts of heavy concentrates are present in the material, which negatively affects the beneficiation process.
SUMMARY OF THE INVENTION
The present invention aims at the provision of a concentrator for beneficiating minerals in which the beneficiating member would be so constructed as to increase the efficiency of the process of concentration of metals and reduce the share of manual labour.
The aims of the invention are attained by that in a concentrator for beneficiating minerals comprising a base with a hub, a beneficiating member with a discharge hole, and a drive mechanism including a hollow drive shaft journalled in bearings in the base hub accommodating with an eccentricity in bearings a shaft of the beneficiating member executing movement about a circle of a radius equal to the eccentricity, according to the invention, the beneficiating member includes a cylindrical housing with tapered separating trays arranged one under the other and having by-pass ports of a flow area reducing from the upper to the lower tray, the cylindrical housing being connected to the base by flexible rods.
The cylindrical shape of the housing with the tapered separating trays arranged one under the other allows, as the material moves from one tray to the other, to reduce its volume, and thereby improve conditions for beneficiation. The tapered shape of the separating trays makes it possible to carry out the final concentration (increase the degree of concentration) in one arrangement to the desired concentration of metal, thanks to that the material being beneficiated tends to concentrate in the recesses of the trays, whereas the gangue and water are evacuated over the edges of the trays. Reducing the flow area of the by-pass ports provided in the trays enables to convey to the underlying tray only the material preliminarily enriched in the overlying tray.
Connection of the cylindrical housing to the base by a flexible rod affords the beneficiating member during its travel about a circle of a radius equal to the eccentricity to execute jolt-like motions facilitating the travel of the material along the trays and ensuring more favourable conditions for separating the material in each of the trays.
Preferably, an additional tray intended to finish the concentrate is connected to the housing of the beneficiating member under the lower separatin
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patent: 666603 (1901-01-01), Cramer
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patent: 2822090 (1958-02-01), Johnston
patent: 3507390 (1970-04-01), Mozley
patent: 3653505 (1972-04-01), Phippen
patent: 4162969 (1979-07-01), Lagal
patent: 4273648 (1981-06-01), Legg
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