US1080768A - Ball-mile. - Google Patents

Description

F. E. MARGY.

BALL MILL.

APPLIGATION HLED PEB. zo, 191s.

F. E. MARGY.

BALL MILL.

APPLICATION FILED IEB.26.1913.

SQ Patfented B61191913 W1 TNESSES IN VENTOR.

` BY `iXi/UML ATTORNEY.

tate about its aXis and its ore and pebble contents will be tumbled about. The balls or crushing bodies are represented by the reference letter b and. the ore or chargel proper by the letter m., the fines or granular particles representing the inal product of the mill and ready to be discharged therefrom, being` represented by m. The Segregation of the fine from the coarse particles and their automatic migration toward the discharge end of the mill during the grind-1 ing and tumbling operation, yis accomplishedl by what l term a sorting drum or colfy umn l11 the drawings illustrating two formsy of construction of the drum. This dr/um is located within the crushing compartment of the mill, being symmetrically disposed about the rotation axis of the mill and occupies a position adjacent the discharge-head e. ln the main form this sorting drum or member is composed of several sections (four in the present illustration) collectively forming when assembled a hollow truncated cone, the base of the cone resting in an annular groove e formed for its reception in the terminal wall h. of a cylindrical platform 12 cast with the head 4l and disposed about the axis of the trunnion 10, the walls of the member l2 being provided with oblong openings O for the free passage therethrough of the material discharged from the mill. Stretched across the annular space between the base of the sorting member 1l and the end of the tube 1 is a wire-mesh screen or sieve 13 (about 2O mesh) the opposite edges of said annular screen being secured to the tube wall, and to the base -of the sorting member respectively, in any convenient or suitable mechanical manner. The several sections of the sorting drum are preferably secured in position by means of--bolts 14 passed respectively through lugs 15 onthe drum sections, through the wall h and through the head 4, the nuts n being on the outside whereby the parts may at any time be tightened. The member 1l is further supported by a central tubulcr brace or strut 16 bearing with its free end against the converging ends of the several sections of the sorting drum, the fixed end of the brace beling screwed into a central boss 17 formed on the Wall' ZL of the platform 12..y By the ,arrangement just described it will be seen that the securing' means for the sorting member are out offthe way ofthe mill con tents. and'thus do not in any way ,interfere with the free movementpf the materials'in,vr

yj' The operation 'of the mill can be best .describedfin'connection--with Athe illustration in Fig. 2 towhich reference will be made. ln

this figure, the-tube 1 isrotating clockwise 4. (if wel look toward the right}.tha t is to sag the upper portion. is revolvmg'towai'dthe,

lobserver and 'the bottom portion from the noem/ee observer. As stated at the outset, in order that there may be perfect grinding or crushing there must be a constant migration of the ore particles from the feed toward the discharge end, the particle first entering the mill being the first to leave the mill. l/Vithout the sorting member 11 or its equivalent there is no assurance that the particles will leave in the order in which they enter the mill and so a uniform (granular) ,product is practically impossible. Where water is resorted to to eiiect the `migration aforesaid,` such migration will be imparted only to the very finest slimes, but in 'the ordinary standard sliming mill that is iifteen feet long and half full of pebbles and ore .there would be i very little velocity of the waterthroughthe 1 pebbles, and the carrying power ofthe cur- I rent is very small. lilith the use of the sorting member 11 the pebbles will be higher atone end of the mill than at the other, and as the mill revolves there results a leveling acltion and a consequent migration, the mate- Q rial migrating consisting of pebbles and ore (coarse and fine. lt is a well known fact 'that if we dump a mine car of ore or mine -waste over a dump, the big roc-ks all rattle at the bottom and the fines remain by the tracks. So in my mill, if we cause a migration of the particles and have them higher at one end than at the other, the fines tend ,to remain at the high end and close tothe discharge opening, the coarser particles gravitating to lower planes or levels. -ln this way a perfect separation of granular particles from the rest of the ore and pebbles is made possible.v The presence of the sorting member 11 therefore has the eii'ect of .raising the pebbles to a higher level at one end (the discharge end) than at the other, such raising causing a' higher pressure of the pebbles in that particular Zone. In addition to that, the rolling action of the pebbles vand their movement is nolonger around an axis parallel to the axis of rotation of the mill itself, but the pebbles tend toroll and l grind and revolve about axes at various angles to the axis of the mill. Along the im l mediate 'planes of section4 indicated by section lines l-4, 7-l7,/in Fig. 2, and in fact in the, zone between the headv 3 and the adjacent terminalfo/f Athe member 11, the ore and pebbles assume a position represented by the material in Fig. 4;. in the zone in the region of the plane of'section indicated by section line 5-5, the material disposes itself substantiallyas shown in Fig. 5. Near thpoint pf' discharge. and in the zone in the region` of the section line-6- -6,"the materal'dis-'f poses itself substantially as shown Jin Fig. 6, Fig .7 representing the projectionoftheen tirebody of ore to the right offsectlion-line. 7-7,'.so that the orewhich is dis osed,v along the plane of the section .line 7- proper is merged with the body of ore beyond the sec' iso i 55 The sorting drum nee mst necessmfl mug.

5 dschaxge yand 1G, s @fr one. ik@ otxef han A migration o: cunte i1-@ tides. and paboles iov; conical of @paying Soi 7 40 counter trend does n dsurb the lhase being left te pass th'zfmgh th scm@ (which prevents any @Gafsa parces xot :fel ih tuned m@ he zm, from passmg; mi@ me i trmmwn in the Zone @tween fue head wl e 5@ migration "being mosy confined betWQe-n the drum 11. @i Qomse as zesh @are is fed n migra# of n -es-'gcWa-d fromvhe hoppa? it take@ the phase that en.

isfe about af Crushing' gp s comma comp @,rtm en and havimg Mavn0 povson for screen. @hay fcms wl suggest memseives to the skfl mechanic.

l converging fromv the discharge toward the intake end of the vessel, whereby the coarse particles are caused to migrate away from the discharge end.

6. In combination with a tubular vessel rotating about its axis and provided with intake and discharge openings for the material at opposite ends of the axis, a sorting member disposed about said axis and positioned adjacent the discharge opening and spaced from the inner walls of the vessel, the walls of the sorting member c mverging from the discharge toward the intake end ot the vessel, and operating to segregate the ines from the coarse particles and direct such fines toward the discharge opening.

7. In combination with a tubular axially rotatable tumbling vessel provided with terminal heads having central intake and discharge openings respectively, a sorting drum disposed about the rotation axis of the vessel-adjacent 'the discharge head thereof, the

walls of the drum converging from said discharge headdidward lthc axis et' the vessel and spaced from the inner walls of the vessel, means for establishing intercommunication between the discharge opening and the space between the drum and .inner walls of the vessel, the drum operating to segregate the fines from the coarse particles, and cause a migration of said inestoward the discharge opening whereby the material flows through said intercommunicating means into the discharge opening.

8. In combination with atribular axially rotatable tumbling vessel provided with terminal heads having central intake and diS- charge openings respectively, a sorting drum disposed about the rotation axis of the vessel adjacent the discharge head thereof, the walls of the drum converging from said discharge head toward the axis of the vessel, and spaced from the inner walls of the vessel, means for establishing intercommunication between the discharge opening and the space between the drum and inner walls of the vessel, the drum operating to segregate the fines from the coarse particles and cause a migration of said fines toward the disel'iargc opening, and a flow thereof through said intercommunicating means into the discharge opening, and a screen interposed in the path of flow or' said ines.

9. ln combination with a tumbling barrel having a head provided with a central discharge opening, a platform surrounding said opening and provided `with peripheral openings for the flow of the fines therethrough, a sorting drum secured to said platform and having walls tapering away from said discharge opening and operatingto cause a migration of the fines toward the openings of the platform. y

10. In combination with a tumbling barrel having a head provided with a central discharge means, a hollow platform on said head located in the barrel and provided with peripheral openings for the How of the fines therethrough to the discharge means, a sort ing drum on the platform having walls tapering away from said discharge means, and a screen disposed about the base of the drum and interposed between the latter and the walls of the barrel.

` In testimony whereof I aHiX my signature, vin presence of two Witnesses.

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