Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Patent
1989-06-28
1991-03-12
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
241 791, 241186R, 241189R, 241285R, B02C 13286
Patent
active
049986767
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to milling machines, and in particular, to a milling machine which is suitable for impact treatment of gold bearing ore.
BACKGROUND ART
In the mining and milling of gold bearing ore, there are known machines which are used for impaction of the ore particles in a dry state.
These machines are basically drums into which the gold bearing ore is deposited. The drums have internally a plurality of rotor discs and hammers which are rotated at approximately 1000-1500 rpm, forcing the ore onto a series of plate members formed on the inside of the drum wall. The rotational speed of the rotor ensures that the ore particles are impacted at great speed. The different particles in the ore once broken down are able to be concentrated wherein the gold particles are concentrated at the bottom of the machine whilst the lighter materials are discharged.
OBJECT OF THE INVENTION
It is an object of the present invention to provide an improved mill which improves the milling process as described above.
DISCLOSURE OF THE INVENTION
According to one aspect of the present invention there is disclosed a mill comprising a substantially cylindrical housing having a rotor mounted therein, said housing having an inlet and an oulet, said housing having a transverse cross-sectional interior contour having a plurality of planar surfaces generally in a radial direction away from the longitudinal axis of said housing, arcurate surfaces joining the outer edge of one planar surface to the inner edge of the adjacent planar surface to form a plurality of impacting chambers around the periphery of the housing, said rotor having two cam surfaces, the outer edges of which are substantially adjacent the inner surface of the housing at its closest point, wherein the ore which is to be milled is inserted through the inlet into the housing and is impacted by the rotating cam surfaces and forced onto said planar surfaces by the rotation of said rotor and therefore being broken up in stages by the plurality of impacting chambers, the impacted ore being forced through an outlet chamber where the heavier particles are collected whilst lighter particles are exhausted, wherein an outlet passage between said impacting chamber and said outlet chamber prevents the broken up ore in said outlet chamber from re-entering said impacting chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with reference to the drawings in which:
FIG. 1 is a transverse cross-sectional view of the mill of a preferred embodiment of the present invention,
FIG. 2 is a transverse cross-sectional view of the inlet and outlet chambers of the mill of the preferred embodiment, and
FIG. 3 is a detailed schematic view of the input system as illustrated in FIG. 2.
BEST MODE OF CARRYING OUT THE INVENTION
The mill 10 as illustrated in the drawings consists of a rectangular boxed casing 11 having an internal housing 12 with a rotor 13 mounted therein. The rotor 13 is driven in an anti-clockwise direction by a motor via a fan belt drive (not illustrated). The rotor 13 rotates in bearings (not illustrated) located on the end panels (not illustrated) of the casing 11. The casing 11 has a top panel 14, two lateral panels 15 and 16 and a base 17 as well as the end panels.
The inner surface of the internal housing 12 has a plurality of planar surfaces 18 which are substantially perpendicular to the circumference of the rotor 13 and extend longitudinally inside the housing 12. These surfaces 18 are connected by arcuate surfaces 19 to form a continuous surface of the interior of the housing 12.
The planar surfaces 18 of the internal surface of the housing 12 are made from hardened steel and are bolted into place. After use and the planar surfaces 18 are worn, they are able to be removed through openings 24 in the casing 11.
The circumferential surface of the rotor 13 comprises two cam surfaces 21 which are in a plane in the radial direction from the axis of rotation 22. A pair of slotted grooves 21a are located in the rotor 13 t
REFERENCES:
patent: 1573040 (1926-02-01), Crites
patent: 1608183 (1926-11-01), Quante
patent: 2505674 (1950-04-01), Knight
patent: 3887141 (1975-06-01), Francis
patent: 4607799 (1986-08-01), Currie
patent: 4848677 (1989-07-01), Rayner
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