US905815A

US905815A - Apparatus for the magnetic separation of ore.

Info

Publication number: US905815A
Application number: US38129307A
Authority: US
Inventors: Gustaf Groendal
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-06-25
Filing date: 1907-06-25
Publication date: 1908-12-01
Anticipated expiration: 1925-12-01

Description

G. GRNDAL.

APPARATUS POR .THE MAGNETIC SEPARATION OF ORE.

APPLIOATION FILED mm: 25,1907. 1

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G. GRNDAL. APPARATUS FR TB MAGNETIC SEPARATION 0F ORE. APPLICATION FILED JUNE 25, 1907.

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nfl-messes A 7. 'mven'mR I @n i 3y l G. GRNDAL. APPARATUS FOR THE MAGNETIC SEPARATION OP ORB.

APILIGATION FILED JUNE 25, 1907. l i

Patented Dec. 1, 1908 s sHBETs-SHET a.

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. INVENTOR www my WITNESSES 'UNITED STATES eUsTAF GRNDAL; or 'DJURsHoLu SWEDEN.

APPARATUS FOR. THE MAGNETIC SEPARATION ,OFl ORE.

Specification of Letters Patent.

Application led June 25, 1907. Serial No. 381,293.

To all whom 'it may concern:

v4Be it -known that I, GUSTA'F GRNDAL, a

subject of the King of Sweden, and resident 'of-"Djursholm, Sweden, have invented cery-tain new and useful Improvements-in Apwith iron lamels is changed for an endless horizontally arranged conveyer band made of a magnetically indifferent material, the under part of said band moving above and at a suitable .distance from the surface of the current containing theV suspended material and between the water and a sy-stem of electromagnets with elongated pole pieces 'which is substituted for the magnet pole having an elongated edge. The electromagnets of` said system must have such a position relatlvely to the inner side of the band that the end surfaces of their pole pieces directed towards the band are parallel to the band and the magnet system must extend so far along the band as to reach over a vessel adapted to receive the concentrate sticking to the underside of the band when it has come beyond the sphere of action of the magnet system and falls down. The apparatus, 1n what concerns the conduction of the current of suspended material under the endless band is arranged similarly to the apparatus described in the Patent No. 812170 which patent is referred to and the operation is also the same.

In the accompanying drawings'there are shown diagrammatically two forms of the apparatus according to'the invention, Figure l being a longitudinal section of a double apparatus having the band moving in the direction of the current of suspended material and Fig. 2 beingl a cross section on line 2-2 Fig. 1. Fig. 3 represents a single apparatus in a section on line 3 3 of Fig. 4i the band moving at right angles to the direction of the current of suspended material and Fig. 4 is a section` thereof on line 4 4 of F ig. 3.

The same reference letters indicate the same. or corresponding parts.

Patented Dec. 1, 1908.

rotated by means of a belt connection from a motor. vD7 D are the systems of electromagnets. Beneath the band there are several vessels and compartments having the necessary inlets and outlets. E is a feed conduit for'the-material suspendedin Water to be separated. Beneath the outlet of said conduit E there-is a vessel F. in the bottom of which a water vconduit H provided with a regulating cock Gr opens. separated by means of a partition c' which is lower than the side walls J and preferably has the form shown in Fig. 1 from a vessel K from the bottom of which issues an outlet pipe M yprovided with a cock L. The vessel K is provided .with an overflow N on the other side of which there is a discharge 0 and `on the other side thereof a transverse partition P on the other side of which there is a similar set of vessels F, K and O arranged in the same mannerV relatively to the electromagnet system D as the vessels F, K and O relatively to the electromagnet system D and provided with corresponding pipes H', M provided with regulating cocks G', L. On the other side of the partition P The vessel F is' there is a vessel R provided withfan opening f Q. S and S indicate water. conduits provided with nozzles T, T directed towards the underside of the endless band.I With some movement has been imparted to the endless band in the direction of thel arrow the finely divided ore to be separated is led into the compartment F by a conduit E. This compartment aswell as the compartment K are illed with and traversed by a current of water which is fed from the pipe H in the required' quantity. This water keeps the ore powder coming from the conduit E in the vicinity of the surface and carries the powder with-it over the partition z' and over the compartment K and also over the overflow N and discharges through the `outlet O. During this conveying of the o'e powder beneath the magnets the separation is ef-` fected in three grades in the following manner. The particles ofpure ore are attracted towards the band and drawn upwards from out of the water sticking'to the bandas long as it presses under the magnet system z'. o. over and past the discharge O after which they fall down and 'are gathered. The less pure ore particles rest 'on the water surface and cannot penetrate it but follow the current of water and are discharged through the outlet O and gathered for further treatment. The gangue or the particles not attracted by the magnet system sinkfto the bottom of the compartment K and are discharged through the pipe M.

The operation just described is the one occurring in a single apparatus having only one magnet system vbut under certain conditions itmay be advantageous to further purify the ore. particles drawn upwards out of the water towards the band, as less pure particles may adhere mechanically, and for this purpose a double apparatus is used as shown in the Figs. l and 2. In the said double apparatus when the band with ad# hering ore particles has passed the magnet: system D the particles leave the band and fall down into the vessel F', lWater jets from the pipe S ,facilitate this 'falling down of the ore particles. rl`hrough this vessel F passes a. regulated current ot' water from the pipe H in" the same manner as is the case in the vessel F. The powder is carried and conveyed by this current until it arrives under the second magnet system D when the pure ore particles, being in the meantime separated by the water from therlcss pure particles that may have followed along with them are drawn upwards out of the water b` this magnet system and are carried by the band beyond the partition P', fall down into the vessel R and are removed through the opening Q. later jets from the pipe S cleanse the band. The less magnetic particles are discharged with the water through the outlet O' and the not attracted particles fall down into the vessel K and are discharged through the pipe M.

From the foregoing description of the operatiouthe operation of the apparatus according to the Figs. 3 and 4 is evident, the only ditference being that the endless band B in consequence ot its arrangement convcys the ore particles drawn out from the current of water laterally to said current and these ore particles fall down into the vessel l?.

lf the finely powdered ore does not contain any middlings the cock L may be set in such a manner that the water surface is kept as shown on the Figs. 3 and 4 and no water is run'iing over the overflow N. Said overflow for collecting the middlings can then be omitted.

In the forms of apparatus shown the pole pieces of the magnet systems are lying with 5 their ends parallel to the lower part of the endless baud but the same etiect is also obtained if one or more pole pieces should be placed at a greater distance from-the lower part of the band if only the corresponding magnets are made more powerful than the other.

I claim: f

l. An apparatus for the magnetic separation oi ore comprising a vessel to receive the mixed material, means for leading the latter thereto, ay conduit for water opening into said vessel, a second vessel communicating with the latter by Aan overflow and provided with an outlet and an overflow discharge, in combination with a magnet'above the vessels and extending beyond the'overtlow between the same, together with a band interposed between the surface ot' the water in said vessels and said magnet and extend-- ing over the second vessel and its overflow discharge and means to move said band, substantially as and for the purpose described.

2. An apparatus for themagnet'c separatien of ore comprising a vessel to receive the mixed material, means for leading thelatter thereto, a, conduit for 'water opening into said vessel, a second vessel communicating with the latter by an overtiow and provided with an outlet and an ovcrow discharge, in combination with a. second set of vessels similarly arranged and placed in tandem therewith together with a magnet above each set of vessels extending beyond the overflow between the members ot each set, and a band interposed between said magnets and the surface of the water in said vessels and extending over the said vessels and overflow discharges, whereby the material. separated in the first group of vessels may be transferred to the second set, and 'means to move said hand, substantially as described.

23. An apparatus for the magnetic separation oi" ore, comprising a vessel to receive the ore. a conduit for a suspension liquid opening into said vessel, a second `vessel communicating with the latter by an overflow and provided with an outlet and an overllow discharge, in combination with a magnet or magnets arranged above the overtiow between said vessels andex'tending beyond the second vessel and its overflow discharge, together with a movable bandinterposed between the surface oi the water in said vessels and said magnet system and extending over the second vessel and its overflow discharge. substantially as and vtor the purposes described.

lu testimony whereof l have signed my' name to 'this specification, two su srrilnng witnesses.

GUSTAF ll'tDL.

in the presence of lVitnesses (lun. Frumento,A HJALM'AR Znrrnns'rnon.