US1247293A - Combination stamp, crushing, and grinding mill. - Google Patents

Description

A. F. LEVITT. COMBINATION STAMP, CR USHING, AND GRINDING MILL. APPLICATION FILED MAR, 8,19I7- r 1,247,293, I v Patented N0v.20,1917.

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Patented Nov: so, 191W.

Application filedllfarh 8; 1917; Serial No. 153323;

To all whom it may' 00mm.-

Be it known thatI, ARTHUR F. Lnvrrr a citizen of the United States, residing at South Pasadena, in the county of LosAnge les and State of Californiayhave invented new and useful Improvements in Combination Stamp, Crushing, and Grinding Mills, of which the following is a specification;

This invention relates to an oremill and particularly pertains to a combined crushing' and grinding mill for use in the'amalgamation process of ore recovery. 1

It is an object of this invention'to provide a mill for thetreatment ofores and the re covery of precious metals "which ha's'a combined actionto stamp or crush the ore and' to thereafter grind it by a continuous operation anduseof'one set of operating elements.

Another object ofthis inventionis to provide a mill for the treatment of ores and the recovery of precious metals therefrom which will subject the ore to a simultaneous crushing and grinding blow, thereby causing the ore to be forcefullystruck and ground during a single movement thus insuring that the ore will be quickly separated from the metal without becoming lost and without the amalgam'being floured, as is common in stamp mills and the like, where the ore is given a direct and powerful stamping stroke.

-Another object of this invention is to pro vide an. ore treating machine which will cause the ore to continuously move over the grinding floor and-will permit itito fall at a certain intervals in a manner to disintegrate it and permit it to come in contact with the amalgam without being struck by the grinde ing element. V y t 3 Another object of this invention is 'to pro" vide an ore mill whichwill positively and automatically clearitself of the tailings and insure that the screens through which; the tailingsfiow willbe maintained in a desirable and cleaned condition.

Another objectof this invention is to pr'ovide a grinding mill designed along; the lines off'an arrastrewhich isfitted with a floor of peculiar construction so that pockets of amalgam may .be distributed over its grinding-surface in a mann'erto entrapthe metals freed from the ore and cause them to be recovered withoutidifficulty.

Another object of this invention is to pro-' vide means for retaining the large; particles of ore within the milluntilfthey have been thoroughly pulverized and at the same time permitting the tailings tobe drawn from the mill in a continuous manner without carrying away the al'nalgam'.

Another ob'ect ofthisinVentiori is to pro vide grinding andcrushing elements which may be easily replaced'andwhi'ch are drawn by a mechanism of simpleconstruction.

Another object is to provide feed means forthe mill which will permit-raw material to be continuo'uslyfedto thegrin'ding floor without interruption of the-operation of the driving mechanism.

Another object of this invention is to provide means whereby'the grinding floor may be easllyj uncovered and the amalgam' cleaned therefrom.

It is a further object to provide a mill of the above class which may be constructed of stone,"metal, or other materials and which will operate equally well regardlessof the material from whichit is constructed,*thereby providinga mill which may be easily set up in remote localities and inexpensively operated;

Other objects will appear hereinafter.

The invention is illustrated, byway ofexample; in the accompanying drawings in which: V

Figure 1 is a view in side-elevation illustratingthe' mill as assembled for operation and with parts broken away to disclose the detail formation of the grinding floor.

Fig. 2 is a view in plan elevation'and sec tionas seen taken on a line directly below thedriving head and as disclosing the dis tribution of grinding members around the floor and the manner in which water issupplied to said floor. 1

Fig. 3 is an enlarged fragmentary detail elevation showing how a grinder jumps an amalgamating pocket.

Referring morejparticularly to the drawings, 10 indicates a base, which is here shown as circular in formation and supported upon supporting posts 11. This base may be formed of any desired material but ispreferablyformed of concrete and is adapted to' provide a support for a grindingfloor 12;

rati'on is disposed at substantially twenty/5 two and one-half degrees to the vertical, and thewall 16 is preferably formed at right angles to this face.v Various materials treated andthe speed ofoperation will determine this angle, however. be seen that a V-shaped pocket 14 is formed for the reception of amalgam to be utilized in the recovery of the ore. Surrounding the,

grinding floor is a wire inolosure 17 which prevents large pieces of ore from pass ng out with the tailings into a sluice-way 18. The inclosure is bounded along its lower edge by a continuous baflle strip 19 which partially closes the outer ends of the serrations and-forms a trap for .the amalgam and fine stuffsettling therein.

A center-shaft 20 extends vertically through the base and provides a mounting for a drivin'g'head 21. This head is disposed in ajhorizontal plane and is fitted with a series of drag chains 22 which depend from its under face and are connected to grinding members '23. These members, as particularly shown in Fig. 1 of the drawings, have a fiat face adapted to bear upon the inclined face 15 of eachserration as the driving head rotates in the direction of the I arrow -1a--. The'rear face of the grinding members is here shown as disposed at an angle of less thanninety degrees to the grinding face, although this angle may be varied and thereby will provide clearance "16 between it and the vertically inclined face 16 of the serrations. This allows the grinding elements, which are of considerable weight, to fall'from the apex of the tooth to the gullet with considerable force.

This will crush the ore and as the grinding elementis dragged 'alongthe face 1 5 'of'the serration. the ore thus crushed will be ground. The driving head'may be rotated by any desired source of power and is here shown as formed with a rim gear 24 in and is formed with a downwardly turned elbow 30; An inturned trough 31 is secured at the bottom ofthe chute and acts to direct the ore from the hopper in between the driving head and the grinding floor. It will be noted that due to the manner in which the grinding elements are connected to the head, the ore will fall around and over these elements and will finally settle within the pockets of the'grinding floor as the operation ofthe machine continues and thereby insure that the reduced ore will be thoroughly subjected to the action ofan amalga- It will thus tion of the arrowaandthe driving ele mating agent. The drivingstructiire is reinforced by means of side posts 32 and 33 which extend vertically at-opposite sides of the mill and provide support for stay rods Qfl and 35 connecting with'a' collar 36 This collar is positioned around the upper end of the center shaft 20 and actsto 'giveit stability. p I p In operation, ore or other material to be treated is plaoed withinjthe.hopper 28 and fed "down'throu'gh the chute 29 to the grinding floor; Simultaneouswith which action. the; driving head 21is rotated. in the direcments 28 and thus drawn over thegrinding s0 floor. A'sthese elements move alongtheir course of travelthey will successivelyride up along the inclined faces 15 of the serrations and thereafter will fall with consider-' able force upon theface of the succeeding serration. The 'angle of theface 1G and the speedat which the grinding elements move will determine the approximate point at which theelement will strike the face;of each ser-rat-ion after having fallen from the crestof t'lie'preceding one. In any case, the

operation ofthe machine is such as to insure that the grinding element will not fall d-iv rectly into the gullet of. theserration, as this lowermost crevice is reserved as apocket' for theramalgam and'pulp which is drawn over thecrest of the serration and permitted to amalgama'te therein. Due'tothe fact that the grinding element willnot strike this body of pulp, the amalgam will be prevented from flouring and the pulp in combination therewith will be agitatedto be thoroughly subjected tothe amalgamatingetfect of the agent. lAs the grinding element'strikes the inclined face 'of' each serrati'on it will deliver ablow- 'at an incline to "the face and thereby produce a combined-crushing and grinding action. The force ofthis obliquely delivered blow will causethe pulp andfine. stuff to "splash outwardly through the screen 19 and into the sluice-way '18 thus automaticallyclearing the grinding floor'of use-i less material. As the elements rideup over the inclined faces they will continue to grind the pulp and 'reduce it; I This material will be raked over the crest of the serrations and permitted to" fall free into the amalgam pockets. At the same time, water isgbeing delivered from the sprinkler pipe 37 and will'permit desirable results to be more efliciently obtained. Whenthe mill has been operated a su-ificientperiod'of time,'the driving head 21 may berais'ed upon the shaft 20 and the 'grinding elements removed fromthe floor; The amalgam may then be drawn off f'romth'e grinding floor and the recovery of the metals completed; Especial attention is called to the V-shaped amalgamating pockets 14 produced by the angular ar rangement of the froiit' moderately, inclined faces 15 of the serrations 14, and the nearly vertical rear face 16, together with the inclined rear faces of the grinding members 23, which produces the clearance 16 between a grinding memberand a serration as the grinding member passes from one serration to the next, thereby causing the grinding member to jump the amalgam in the pocket 14.

It Will thus be seen that the mill here disclosed is simple in its construction and at the same time produces a combined crushing and grinding action by the continuous operation of its grinding members.

while I have shown the preferred construction of my ore mill as now known to me, it will be understood that various changes in the combination construction, and arrangement of parts may be made by those skilled in the art without departing from the spirit of my invention.

1 claim:

1. In an ore mill, a circular grinding floor having radial serrations extending upwardly, the front side of each serration being at a moderate incline and the rear side of each serration being substantially at right angles to the front side, thereby forming V-shaped amalgamating pockets, amalgam in theamalgamating pockets, a grinding member having a flat lower face adapted to bear upon the front inclined faces of the serrations, said member having a rounded corner formed by its lower and rear faces to prevent the grinding member from seating Within the amalgainating pockets formed by the meeting of the adjacent serrations, a. rotating member above the grinding floor, and a connection between the grinding member and the rotating member; so that the grinding member is dragged from serration to serration; the angles, arrangement, and speed being such that the grinding member will jump the pocket of amalgam as it passes from one serration to the next.

2. In an ore mill, a circular grinding floor having radial serrations extending upwardly; the front face of each serration being disposed at a moderate incline to the horizontal and the rear face of each serration being substantially at right angles to the front face, thereby forming V-shaped amalgam pockets; the faces of which are exposed at angles to the vertical and horizontal; amalgam in said pockets, a freely moving grinding member having a flat lower face adapted to bear upon the front inclined face of the serrations and a flat rear face disposed substantially at right angles to the lower face and formed with a curved lower edge to prevent the grinding member from seating within the gullet of the amalgam pocket, a rotating member above the grinding floor, and a flexible connection between the grinding member and the rotating member whereby the grinding member may be dragged over the grinding floor and from serration to serration; the angles of the serrations and the rounded rear corner of the grinding member serving to cause the grinding member to jump from the front face of one ser'ation to the front face of the other without seating within the gullets of the serrations.

In testimony whereof I have signed my name to this specification.

ARTHUR F. LEVITT.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatcntt, Washington, I). G.

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