US1822647A - Apparatus for grinding and separating minerals - Google Patents

Description

' f- F? 361%. 8, 1931. H. F. DUEBERT APPARATUS FOR GRINDING AND SEPARATING MINERALS Filed June 13. 1.929

HERMAN F. DUBBERT.

ORNEY 4. INVENTOR Patented Sept. 8, 1931 UNITED STATES PATENT OFFICE HERMAN F. DUBIBERT, OF PORT CLINTON, OHIO, ASSIGNOB I O AMERICAN GYPSUM COM.- IPANY, OF PORT CLINTON, OHIO, A. CORPORATION OF OHIO APPARATUS FOR GRINDING- SEPARATING MINERALS Application filed June 13,

This invention relates to apparatus for grinding and separating minerals and more particularly to apparatus adapted to pulverize the softer mineral in an aggregate composed of particles of minerals of diiferent hardness and separate it from the rest of the ag egate.

ustave A. News United States patent application Serial No. 368,194, filed June 3, 1929 fully describes and claims a process of separating minerals and my invention is espe'cially adapted to carry out that process.

Among the objects of my invention are:

The provision of apparatus for agitating a mineral aggregate and discharging the aggregate from the agitating apparatus to a separator.

The provision of apparatus adapted to cause rubbing action between the particles of a mineral aggregate and to separate out the pulverized. particles of the aggregate after the rubbing action is ceased. I

The provision of a drum type" agitator through which minerals may pass contmuousl Tlie provision of apparatus for separating minerals comprising .a rotatable agitating drum or shell through which the minerals to be separated may passcontinuously and be discharged to a separatlng apparatus.

The provision of efiicient and economical apparatus for treating minerals which consists of a rotatable drum having an opening at one end through which the mineralsmay be charged into the drum'while it rotates and a plurality of peripheral openings at the opposite end of the drum through which the minerals may be discharged. a

The provision'of a new and improved apparatus for continuously agitating and separating minerals.

These and other objects which will hereinafter appear may be attained by apparatus, one embodiment of which is described in this specification and shown in the accompanying drawings in which Figure l is a side elevation of one form of my invention.

50 Figure 2 is an end elevation taken on line 1929. Serial No. 370,478.

The base 1 carries upwardlyextending bearing supporting columns'2. The shafts 3 and 4 are .rotatably mounted in suitable bearings, preferably adapted to take both radial and thrust loads, which are held in place on columns 2 by bearing caps 5. It is desirable for purposes which will be later explained to have the axes of shafts ,3 and 4 disposed at a slight angle to the horizontal and this may be done by making the base 1 thicker at one end than at the other as shown in Figure 1.

Flanged wheels 6 and 7 are keyed to'shaft 3 and flanged wheels 8 and 9 are keyed to the shaft 4 in the same relative position. In addition to'the wheels 6 and 7, the sprocket 10 and driving gear 11 are keyed to the shaft 3. The driving mot-0r 12 is mounted on the base 1 and is connected to the shaft 3 by means of a chain 13 which runs over sprocket 10 on the shaft 3 and sprocket 14 on the motor shaft.

The hollow cylindrical shell 15 may be made from a section of welded or riveted pipe or may be fabricated in any other desired manner. This shell 15 is supported on the flanged wheels 6, 7 8 and 9'by tire rings 16 and 17, preferably made of steel, which are concentric with but radially spaced apart from the outer surface of shell 15. S acing blocks 18 serve to hold the tires 16 an 17 in proper position relative to the shell 15. As shown in Figure 1, the tires 16 and 17 are of the same outside diameter and are spaced apart the same distance as are the flanged wheels 6 and 7 and 8 and 9. The flanges of the wheels 6 and 8 are outside of the tire 16 and the flanges of the wheels 7 and 9 are outside the tire 17. Thus there can be no apits longitudinal axis by the gears 11 and 19.

The weight of the shell is supported by the wheel 6, 7 8 and 9 and the only load on the gears 11 and 19 is that required to drive the shell.

End plates 20 and 21 are shown welded to angle flanges 22 which are riveted to the outside of the shell 15 at its opposite ends; End

plate 20 has a charging aperture 23 at its center. The materials to be char ed into the I rotatable drum formed by the shell 15 and end plates 20 and 21 pass down the chute 24, which projects into the aperture 23 and may be supported in any suitable manner, and 111* to the drum through the aperture 23. End

plate 21 has a plurality of elongated dis charge apertures 25 disposed around the iiiner circumference of the shell 15 and adjacent thereto. The apertures 25 are elongated in a circumferential direction and are spaced close together so that they in effect form a slot which extends around the pe riphery of the discharge end of the shell 15.

As stated above the shafts 3 and 1 are supported at a slight angle to the horizontal consequently the axis of the rotating drum will have the'same angle. Thus as will be seen in Figure 1, the discharge end of the drum will be lower than the charging mud. The material which enters through the aperture in the plate 20 will be carried by the rotation of the drum to its lower end and will be discharged through the peripheral apertures 25 to the chute 26. The lower end of the chute 26 extends over the screen 27 which may be pivot-ally supported on brackets 28. As shown in Figure 5, the screen 27 is mounted on trunnions 29 which are attached to the sides 30 of the screen at points approximately midway between their ends. It is desirable that the screen 27 be given a vibratary movement to aid in the screening operation and this may be accomplished by means of the eccentric 31 on the shaft 32. A spring 33 may be provided to hold theedge of the side 30 of. the screen 27 in contact with the eccentric 31. When the shaft 32 is rotated the action of the eccentric 31 on the side 30 of the screen 27 will cause the screen to vibrate. However, any other suitable means of cansing the screen 27 to vibrate may be used.

It may be found desirable to prr vide rubbing elements to assist in the treatment of the materials which pass through the drum When the motor 12 is runand I have shown a number of steel balls 34:. These balls have a larger diameter than the radial dimension of the apertures 25 and therefore, they will be retained in the drum and not pass out with the material. It will be understood that any suitable means other than steel balls may be utilized for this purpose. i

The operation of my invention is as follows:

The minerals to be separated are charged into the rotating drum through the aperture 23 by means of the chute 24. They drop down on the shell 15, are agitated by the rotation of the shell and caused to move towards its discharge end by the angle of its axis. As the particles of minerals are tumbled about in the shell they rub against each other and against the rubbing elements 34, if such are employed, and the particles of softer mineral are reduced in size by the abrasive action of the particles of harder minerals and the rubbing elements. The speed of rotation of the shell 15 and the angle at which its axis is disposed may be so correlated that the ma terials charged into the drum will reach the discharge end and pass out through the apertures 25 when the desired amount of abrasive action has taken place.

As the discharge apertures 25 are disposed around the periphery of the drum the mate rials which are charged into the aperture 23 will pass through the drum in a continuous stream and the fine particles Will not collect in the bottom of the drum as they would if the discharge openings were not at the periphery of the shell. This makes it possile to accurately control the reductionof size of the minerals which pass through the apparatus as the particles all remain in the rotating drum substantially the same length of time and are subjected to uniform abrasive action.

Other forms of rotating mills with which I am familiar have their dlscharge opening at the center of the discharge end of the drum and consequently some of the materials remain in the drum a much longer time than others and for this reason it is impossible to accurately control the reduction in size of the soft particles by the abrasive action of the harder particles.

When the mineral aggregate passes out through the discharge aperture 25 it falls upon the chute 26 which conducts it to the vibrating screen 27. The fine soft mineral which has been reduced in size by abrasive action has it passed through the rotating drum, Wlll pass through the screen into collecting box 35 while the larger particles of harder minerals will remain on top of the screen.

From the above description it will be seen that my invention is particularly adapted to cause rubbing action between the particles of a mineral aggregate containing minerals of different hardness to reduce the size of the particles of the softer mineral so that they may be separated from the aggregate by a 6 screen. or other separating means. ther uses of my invention will be evident to those skilled in the art and I do not limit myself to the specific form of apparatus shown and described herein except as defined in the ap- 10 pended claims.

I claim l 1. Apparatus for causing relative movement between particles of mineral aggregate com rising a cylindrical shell, means for 1'0- tata ly supporting said shell with its longitudinal axis disposed at an angle to the hori- Zontal, means for rotating said shell about its longitudinal axis, a cover plate adapted to extend across one end of said cylindrical shell and having an aperture at its center throng: which said mineral aggregate may charged into said rotatable cylindrical shell and a cover plate adapted to extend across the other end of said cylindrical shell and having a plurality of circumferentially spaced apart apertures disposed around its periphery but spaced radially inwardly from said shell, and through which said aggregate may be discharged from said shell to a point completely removed from said rotatable shell, the central portion of said last named cover plate being imperforate.

2. In a rotatable rubbing mill, a cylindrical shell rotatably mounted with its longitudinal axis at an angle to the horizontal, a cover plate at one end of said shell having a charging aperture at its center, a cover plate at the other end of said shell having a discharge aperture at its outer edge adjacent said shell, the central portion of said last named cover plate being imperforate, means {or feeding material into said shell through said char 'ng aperture and means for rotating said s ell tocause said material to travel through said shell and be discharged from said discharge aperture to a point completely removed from the rotatable mill. In testimony whereof I hereunto, aflix my signature this 10th day of June, 1929. HERMAN F. DUBBERT.

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