US3231204A - Beneficiation means and methods for autogenous grinding systems - Google Patents

Beneficiation means and methods for autogenous grinding systems Download PDF

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US3231204A
US3231204A US229288A US22928862A US3231204A US 3231204 A US3231204 A US 3231204A US 229288 A US229288 A US 229288A US 22928862 A US22928862 A US 22928862A US 3231204 A US3231204 A US 3231204A
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mill
size
size ranges
grinding
medium
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US229288A
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Le Roy C Ferguson
Hardinge Harlowe
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Beazer East Inc
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Koppers Co Inc
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Priority to US229288A priority patent/US3231204A/en
Priority to GB37700/63A priority patent/GB995114A/en
Priority to FR949508A priority patent/FR1376790A/fr
Priority to SE10872/63A priority patent/SE310345B/xx
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/02—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with perforated container

Definitions

  • This invention pertains to improvements in an autogenous grinding system in which the means and methods of operating the same is such as to cause beneficiation of at least one component of the material which is being ground autogenously in the mill and which material, preferably, is supplied to the mill in run-of-mine condition. More particularly, the invention pertains to such a system, and method of operating the same, in which the beneficiation or treatment of the material undergoing reduction can be applied to an appreciable range of sizes of the material undergoing reduction, autogenously, in the mill.
  • Run-of-rnine material which is the form in which the raw material preferably is utilized in accordance with the present invention, includes intermixed ranges of relatively coarse, medium and fine size ranges of material.
  • run-of-rnine material may have been subjected to as least limited precrushing treatment in order to produce a maximum coarse size of the range usually between 5 inches and 12 inches diameter, these sizes not being intended as restrictive but merely as somewhat illustrative.
  • the addition of other media such as balls, usually in a small amount, is also contemplated.
  • Size ranges depend upon the characteristics of the material being treated and objectives sought. Depending upon the type of material being handled by the mill at any given time, there usually is a preferred optimum proportion of intermixed size ranges of relatively coarse, medium and fine materials. If for example the medium size fraction of the mill charge exceeds the desired proportion of said size range to any substantial extent, the eficiency of the grinding operation becomes impaired.
  • One of the principal objects of the present invention is to provide both a mill system and methods of operating the same by which run-of-mine material is subjected to autogenous grinding in a tumbling mill and a sized portion of the load within the mill is removed therefrom and separately treated, said sized portion which is considered as being too coarse for proper beneficiation thereof is returned to the mill for further autogenous grinding, such further reduced material subsequently being discharged from the mill in a smaller size range either for further treatment within the milling system or discharged as a finished product.
  • Another object of the invention is to remove from the products discharged from an autogenous grinding mill a fraction thereof which is treated outside of the mill and a component, such as a desired sized fraction of the thus treated material is then returned to the mill for further reduction in size, the means employed for treating the material while outside of the mill preferably being capable of handling only a limited portion of the total amount of such size range of the material normally contained in the mill, yet eventually and effectively treating such size ranges of material as it circulates through the autogenous milling system, thereby reducing the cost and maintenance of such a treatment step.
  • a further object of the invention is to treat run-ofmine material having a plurality of characteristics during the reduction stage thereof in an autogenous milling system and which material containsone or more components having different grindability and hardness characteristics, such treatment comprising removing from the mill system, as soon as economically expedient during the milling process, a portion of the material respectively classifiable as tailings, concentrate, completely treated material, or material to be designated for additional treatment, and appropriately treating that material which is removed from the system according to the values therein.
  • Still another object of the invention is to provide means to select a component undergoing treatment for use as grinding media J in another grinding milling circuit, and feeding such selected treated components to such latter milling circuit.
  • a still further object of the invention in conjunction with the treatment of run-of-mine material as it is being reduced autogenously in a tumbling mill, is to remove a sized component, divide the same quantitatively, return one of said divided portions to the autogenous mill for further reduction, and treat another of said divided portions to separate therefrom a component having desired characteristics, the dividing of said discharged size portions preferably being adjustable.
  • Still another object of the invention in conjunction with the foregoing is to provide various kinds of dividing mechanism at selected locations in the mill system, all of said dividing mechanisms preferably being of an adjustable nature and arranged to direct certain divided portions of the material to a selected treating apparatus to perform further desired operations upon the divided material before discharging the same from the mill system.
  • FIGS. 1 and 2 respectively are vertical sectional elevations respectively transverse and parallel to the axis of an autogenous tumbling mill and illustrate exemplary arrangements of run-of-mine material therein as the same undergoes reduction during tumbling in the mill, said mill having exemplary discharge means for certain size ranges of the material undergoing reduction.
  • FIG. 3 is a fragmentary vertical sectional elevation illustrating an embodiment of material segregating means mounted relative to the discharge end of an autogenous grinding mill.
  • FIG. 4 is a fragmentary illustration of an end view of a mill discharge means and showing further treating units and dividing mechanism for the mill system otherwise illustrated generally as in FIG. 3, the view in FIG. 4 at least partially being a vertical sectional end elevation of the mill discharge mechanism illustrated in FIG. 3.
  • FIG. 5 is a fragmentary illustration similar to the upper part of FIG. 4 and comprises the mill discharge and taken on the line 5-5 of FIG. 3 and showing another component adjacent the mill discharge end.
  • FIGS. 6 and 7 are fragmentary sectional elevations of two additional embodiments of mill contour according to the invention.
  • FIGS. 1 and 2 an exemplary autogenous mill ill.
  • S.N. 822,612 filed June 24, 1959, now Patent No. 3,078,049, issued Feb. 19, 1963.
  • S.N. 822,612 filed June 24, 1959, now Patent No. 3,078,049, issued Feb. 19, 1963.
  • the autogenous mill It? comprises a drum 12 having opposite ends 14- and 16 respectively provided with trunnions 18 and Eli which are rotatably supported in suitable in suitable bearings, not shown, the mill being rotated by conventiona power means, not shown.
  • the trunnions 18 and Zll are hollow and respectively comprise inlet and exit means for the mill.
  • the specific shape of the mill is not a critical aspect of this invention, neither as to the feed or discharge ends nor the specific proportions of the interior dimensions thereof.
  • the interior of the mill is provided with suitable lining means of a conventional nature and, overlying the same, are radial lifter bars 26 which are carried by entrance end 14 of the mill, while preferably sectional type radial lifter bars 28 are connected detachably to the exit end 16 of the mill.
  • the lifter bars 28 secure grate sections 39 of segmental shape in spaced relationship to the exit end 16 of the mill as thus shown in FIG. 2.
  • An annular discharge space 32 is formed between the exit end 16 of the mill and the grate 3G to receive material which is capable of passing through the slots or other size-limiting opening means formed in the grate 3Q, exemplary arcuate grate slots being shown in FIG. 1.
  • Curved, generally radial lifting vanes or scoops 34 which are circumferentially spaced from each other, are provided in annular space 32 for purposes of elevating the material discharged into the space, as the mill rotates, whereby when the elevated material rises above the axis of the mill, it will fall by gravity into discharge cone 24 for exit from the mill.
  • a mill of this type will elevate the material to a substantial height within the mill before the same cascades in a manner as illustrated in exemplary form in MG. 1.
  • the exemplary position of the material in the mill will be somewhat as indicated by the irregular upper boundary line 38 thereof which is shown in FIG. 1.
  • the mass of material undergoing reduction in the mill will consist of various size ranges of relatively coarse, medium and fine material and the cascading of the material serves to reduce all size ranges of the same simultaneously.
  • Autogenous grinding of run-of-mine material varies as to optimum elliciency in accordance with the available proportion of relatively coarse, medium and fine size ranges of the material, variations in the harness of the material, variations in the values content within specific pieces or fragments of material, whether the grinding operations are under wet or dry conditions, and various other factors well known to those familiar with autogenous grinding.
  • One purpose of the present invention is to counteract certain disadvantageous conditions or circumstances in regard to grinding autogenously run-of-mine material, especially for purposes of insuring as far as possible optimum grinding conditions within the mill, and thereby effecting maximum economy from the standpoint of minimizing wear and consumption of power, coupled with maximum percentage of desired product produced by the autogenous grinding mill and system.
  • the present invention provides an autogenous grinding mill pound type of trommel, broadly indicated 46.
  • the spaces 13 through which the pebbles 51) exit from the grinding zone of the mill may comprise portions of the radial spaces between segmental edges of the grate sections 31) for example.
  • the extent and position of the discharge openings 48 is determined, for example, by the placement of the sections of the sectional type radial lifter bars. 28 and particularly by the omission thereof at various locations within the mill.
  • One of the preferred positions for the discharge openings 4-8 however is adjacent the periphery of the discharge end of the mill 1t and a number of such exemplary openings 48 are shown in FIG. 1. 'It will be understood further, also,
  • the openings 48 will be minor in proportion to the total discharge areas adored by the openings in the grate sections 30, whereby only a limited proportion of such larger pieces or pebbles 50 will be discharged from the grinding zone of the mill in comparison with the volume of relatively fine size ranges of material discharged through the openings of the grate 39.
  • the pebbles or cobs 5d which are discharged from the grinding zone of the mill may, for example, be of a size range between 3 inches and 1 inch, Whereas another sized range material may, for example, be between 1 inch and 10 mesh, the fine ranges of material being, for example, minus 10 mesh and finer. It will be understood however that these designations are for purposes of illustration only, rather than being restrictive in nature and suitable variations are contemplated as herein above stated.
  • the discharge cone 24 of the mill 11 has associated therewith a com- Concentric screens or bar-type trommels 104 and 106 are connected to the exit end of mill 1% and are rotatable therewith.
  • the inner trommel 1114 is relatively coarse, while the outer trommel 106 is relatively fine, the latter permitting the passage therethrough of relatively fine size ranges of material 1138, which discharges into a conduit 110 and may be removed from the mill system as a finished product if the nature of the material is suitable.
  • the maximum particles therein may be in the range of minus 10 mesh or even 35 mesh approximately. This however is subject to variation due to the character of material treated as well as product desired.
  • the classifying and segregating means 46 by reason of the use of coarse trommel 104, is capable of separating from the exemplary coarse pieces or pebbles 50 an intermediate size range of material 112 which passes through trommel 104 but will not pass through sieve or trommel 106.
  • the intermediate size material r 112 and subject to modification as stated herein, it can be,
  • the coarse fraction of material comprising pebbles 5t ⁇ , discharges from the outer end of the inner trommel 104 into the upper end of chute 114 which contains an other pivoted splitter 116 disposed between an inner wall 118 and the outer wall 120 of the chute 114, the inner wall 118 merging with a pair of discharge chutes 122 and 124 which are best shown in FIG. 4.
  • FIG. 5 is a section, viewed on the line 5-5 of FIG. 3, and in which the splitter 116' is independent of splitter 116 shown in FIG. 4, although they are in the same discharge hopper 114, but are separated by inner wall 118 into separate discharge chutes 122 and 124' as shown in FIG. 3.
  • the handling of materials of the type treated in the present invention is best accomplished by limiting the size range of the material to be treated.
  • the same method of treatment does not usually apply to diiferent size ranges, or the apparatus employed for the different ranges may require different adjustment for efiiciently handling one size range from another, as is well known in the art. For this reason provision is made to divide the mill 10 product into different size ranges for delivery thereof to different apparatus.
  • An example of this method for dividing the size ranges into three components is exemplified by the multiple trommel means of FIG 3, and is further illustrated relative to an overall mill system in FIGS. 4 and 5.
  • medium and near fine size ranges comprising for example pebbles 50 and intermediate sizes 112 that are to be beneficiated or treated in mill 1t
  • the system included therewith When a wide range of sizes such as exemplified above are to be treated, it is advisable in many cases to divide the ranges into size limiting components. Two such general sizes of components are illustrated here but it is within the scope of this invention to add additional size limiting or segregating means in a similar manner, if desired, or confine the operation to one selected size range if advisable.
  • a picking belt 64 is shown in the mill system to receive the coarse size range of material comprising pebbles 50 and the like, the same having been discharged thereonto from suitable, diagrammatically illustrated adjustably positionable guide mechanism 125, or the like, to render the material suitable either for hand picking, or to transmit the same to a magnetic separator 66 of a pulley type, for example, well known in the art.
  • a pair of chutes or hoppers 126 and 128 are shown in side-by-side relationship therein, each of the same having a splitter 130 and 132 respectively, for purposes to be described.
  • the guide mechanism may be positioned, for example, to direct the coarse fraction of material by appropriate means such as conduit 80, to a heavy media separator 82.
  • a heavy media separator 82 is illustrated in prior Patent No. 2,753,998, in the name of Harlowe Hardinge.
  • such seperator comprises a slowly rotating cylinder 82 containing liquid 86 which usually is fortified by fine, heavy solids floating therein, of such a consistency that the specific gravity of the liquid approximates that of the material to be separated, whereby the lighter portions of said material tend to float and are discharged at outlet 88, while the heavier portions sink and are delivered to the opposite end it? by spiral flights 92 within the cylinder.
  • Suitable buckets are provided within the end 9G which discharge into exit chute 94.
  • An auxiliary divider or splitter 132 is shown adjacent the exit chute 94 of the separator 82, and is operable to direct the heavy media material into any one of a number of conduits or the like, to be described hereinafter.
  • the guide mechanism 125 also may be set to direct the coarse range of material to the exemplary unit 36 comprising supplementary beneficiating or treating means of any one of a number of different types and from which the products may exit to one of several different possibilities to be described hereinafter.
  • discharge conduit 124 it preferably discharges into a dividing or splitter mechanism 134 capable of directing the material from conduit 124 into one of several channels, respectively for the following exemplary purposes.
  • the material discharged into conduits 122 or 124 may, either with or without further beneficiation, be discharged as finished products or they may, as required, either be returned to the autogenous mill 1t), directing to appropriate treating means in regard to conduit 122, or used, for example, as grinding media in an auxiliary or supplemental size reduction device 136 of any appropriate type.
  • a tumbling type mill can be used in which the sized pebbles 59 are suitable to serve as grinding media for reduction of other material fed thereto which usually is considerably smaller in size range than said pebbles 50.
  • the size reduction device 136 may be, for example, a secondary crushing or coarse grinding device useful for further beneficiation or treatment such as directly reducing the size of the pebbles or coarser size fractions either to render the values therein more readily accessibleto beneficiation or for tine grinding thereof or to producea productof smaller usable size for return to mill 10 or other means.
  • a secondary crushing or coarse grinding device useful for further beneficiation or treatment such as directly reducing the size of the pebbles or coarser size fractions either to render the values therein more readily accessibleto beneficiation or for tine grinding thereof or to producea productof smaller usable size for return to mill 10 or other means.
  • the divider or splitter 134 in the latter can be positioned either to direct the coarse fraction of material back to the mill 10, or to the auxiliary or supplemental crushing or grinding device 136, or both, simultaneouslyv
  • Appropriate positioning of splitter 134 may be a desirable procedure particularly when regulation of the quantity delivered to crushing or grinding device 136 is desired.
  • Said device 135 may either be a tumbling mill, as above described, or a secondary crushing or grinding unit for direct reduction of the pebbles t delivered thereto.
  • the product therefrom may either leave the mill system at 14th or may be returned to the mill for further reduction in size by conveyor line 138 through appropriate positioning of guide aechanism 136.
  • the material which is discharged into conduit 122 has va wider choice of treatment than that which is illustrated :in exemplary manner as having been discharged into conduit 124.
  • the directing blade 125 may be set to discharge the material through conduit 62 onto picking belt 64 and, in the event the magnetic separator '66 is employed, some of the material, such as non-mag- :netic material for example, may be discharged into chute or conduit 126 and, depending upon the setting of the :Splitter blade 1319, some or all of the material may be discharged either as waste or desired product, as indicated by the arrow 142, while that material which is discharged along the line of the exemplary arrow 144, is
  • the quantity delivered to :splitter 145 is adjustable by varying the position of splitter .130.
  • the magnetic material is carried into conduit 128 upon :release from the magnetic separator 65, whereupon it engages the divider or splitter blade 132, whereby some or all of the material may be discharged or removed from the system, as indicated by the exemplary arrow 148, or said material may be directed to a further exemplary splitter 15%), from which location the material can be directed in the same manner as that described for the nonmagnetic material indicated by conveyor lines 138 and 140.
  • lighter segments of material discharged from the heavy media separator 82 may be handled similarly to the heavy or sink material as to discharge into splitter 154 and exit from the system at 156, partial or total return to mill 10, or directing the same to auxiliary crushing or grind-ing device 136 via conveyor or conduit lines 138 and/or 140.
  • Still a third possibility for the material in conduit 122 being subjected to a particular setting of the directing blade 125 comprises setting the latter so as to direct the material along exemplary line 158 to direct it to the exemplary supplementary beneficiating or treating means 96 which can comprise any of a wide variety of means such as concentrating tables, jigs, spirals, flotation apparatus, alternate magnetic separators, as well as additional sizing and reduction means including appropriate crushers or auxiliary mills.
  • the product may be discharged, as indicated by the exemplary arrow 1%, as either a waste or finished product for example, or a portion thereof may be returned to mill 14) through line 138, or another portion may be sent to a crushing or grinding device 136, all as above described for the other beneficiation means.
  • discharge conduit line 122 in H6. 4 also applies to conduit 122' of FIG. 5 which illustrates a finer size range of material than that of conduit 122 in FIG. 4. While guide means 125 of the system in FIG. 4 may direct the product, in the size ranges produced in the coarser separation circuit, to one of the beneficiation or treating means, guide means 125 of the system in FIG. 5, which receives its split material from splitter '9 116', will direct its size range to another treating means as exemplified by the various means here described.
  • Guide means 125 or 125' preferably are not dividing or splitting means such as splitters 116 or 116' of FIGS. 4 and 5 but are of the type made to direct the entire amount received thereby to one of the appropriate beneficiation, or treating means, unless special conditions prevail.
  • This different action also applies to the other splitters 130 and 146, which are in hte magnetic separator circuit, and likewise to splitters 132 and 150, or splitters 132 and 154 in the heavy media circuit.
  • splitters associated therewith for directing the products is the same as described above, although not shown.
  • These splitter arrangements as above described, if desired, direct all or part of the material received thereby to one path or divide the quantity received according to the choice of the operator. Three paths generally are available; exit from the system, return to mill 10, or delivery to the crushing or grinding device 136.
  • the beneficiation or treating devices need not be of a capacity. to handle all the product at one time.
  • Such devices of lesser capacity can be relatively small and less costly than devices of larger capacity, yet eventually they handle the material prior to its being reduced so fine as to pass beyond the size range for which said beneficiation or treatment step serves a useful purpose. This is particularly true in an autogeno-us grinding mill circuit handling run-of-rnine material where the tendency therein is to produce a relatively large percentage of a socalled medium size range in the mill charge.
  • the ends are conical or sloping.
  • Such contour is advantageous with certain materials and under certain conditions, especially in regard to discharge characteristics inherent to a sloping grate.
  • Two exemplary embodiments of such other interior contours are illustrated in exemplary manner in FIGS. 6 and 7, both of which have in common the feature of the grate being substantially perpendicular to the axis of the mill.
  • the tumbling mill 10 which preferably is of the autogenous type, has sloping or conical opposite ends 14 and 16'.
  • the end 14' is protected by conventional lining material and is provided with radial lifter bars 2% and an annular deflector ring 42".
  • the periphery also is similar to that shown in FIG. 2 but the discharge end 16 is provided with a grate 162 which is substantially perpendicular to the axis of the mill and over the inner face of which preferably radial lifter bars 164 extend, the same serving to hold the grate 162 connected to the exit end of the mill, if desired.
  • the grate 162 extends substantially from the inner periphery of the mill toward the axis a predetermined extent, the inner periphery of the grate terminating adjacent an annular deflector ring 166 which, like grate 162, is spaced in an axial direc tion from end wall 16' to provide an annular discharge space 168 of greater relative capacity than the space 32 of the embodiment of FIG. 2 when mills of comparable dimensions are compared.
  • Suitable spacer bars 170 serve to maintain said grate 162 and ring 166 in operative spaced position relative to end 16'.
  • the deflector ring 1656 is spaced radially appreciably from the axis of the mill and also radially from the conical terminal member 172.
  • An annular interior wall member 174 extends between the perimeter of member 172 and ring 166, the same preferably being made of conventional abrasing resisting lining material and positioned relative to end 16' by spacer bars 170.
  • Such grin-ding media is similar, for example, to the pebbles 50 discharged through openings 48 in the embodiments of FIGS. 2 and 3, but the openings 176 preferably are formed directly in the grate sections rather than being between the grate sections as in regard to openings 48.
  • grate 162 is much less subject to direct impact abrasion than grate 3i) and where material is particularly abrasive, especially to the grate segments, grate 162 obviously is more advantageous than grate 30.
  • grate 162 is much less subject to direct impact abrasion than grate 3i) and where material is particularly abrasive, especially to the grate segments, grate 162 obviously is more advantageous than grate 30.
  • the end walls 14" and 16" preferably are substantially parallel and the same are lined with conventional lining material and especially the wall 14" has radial lifter bars and a deflector ring carried thereby which are similar to the corresponding elements in the embodiments shown in FIGS. 2, 3 and 6.
  • the end wall 16" is the exit end wall and it carries the grate 173 which not onlyis perpendicular to the axis of the mill but also is parallel to the exit end of the mill.
  • the grate 178 also is spaced axially from end wall 16" to provide exit space 180 into which material discharged from the grinding zone of the mill through the grate openings is received prior to being elevated and completely discharged from the mill through the exit trunnion as in regard to the mill of FIGS. 2 and 3.
  • the mill shown therein also is provided with an annular, laterally extending expansion zone 132 between the periphery of the mill and the outer periphery of grate 178, into which falling material may move laterally to expand, while when the material is elevated during rotation of the mill and tumbles or cascades onto the load portion of the material in the lower portion of the mill, the annular deflecting ring causes further deflection over the afforded by ring 42", on the opposite end of the mill, and additional deflecting ring 1% adjacent the inner periphery of grate
  • the latter ring and the perpendicular position of grate 178 offer advantages similar to corresponding elements in the mill of FIG.
  • FIG. 7 also preferably has a limited number of discharge openings 138 therein of similar size and quantity, and for similar purposes, as openings 1% in the mill grate 162 of FIG. 6, to discharge pebbles or cobs Openings 188 also are in the grate per se.
  • Treating is intended to encompass size reduction and/or beneficiation of the material, either singly or in unison.
  • Size Reduction pertains to making size change only.
  • Beneficiation is generally considered the process of removing either part or essentially all of the value material from the waste material, depending upon the characteristics of the material such as grain structure, and usually requires size reduction at one or more size ranges of the material so as to properly cause economic liberation of most of the waste material from the value material.
  • Value Material is relative in that it may and usually does contain some waste material, hence the reason for size reduction of certain ores to a relatively fine degree, especially where the values are locked in so as to require fine division or grinding to render them accessible and liberate them.
  • Other materials may be almost pure values, even in larger sized com, oncnts, and still other ones have a mixture of these characteristics.
  • Waste Material also is somewhat relative since it may be substantially completely waste or contain a minor amount of values. Thus it is subject to the same consideration as the above-described value material in that it may require additional treatment at times such as size reduction and/ or beneficiation, depending upon the character of the material.
  • the various embodiments of mill systems, classifying and segregating means such as unit 46 in FIG. 4, together with the various directing and splitter arrangements and treating means and units, are capable of handling selected size ranges of material.
  • the present invention affords a relatively Wide variety of various means and mechanisms, as well as processes produced thereby, for effecting max imum eliiciency in the autogenous grinding mill 1t ⁇ and system associated therewith.
  • One of the principal advantageous features of such systems is the provision of size limiting and adjustably positionable discharge openings 48 through which a relatively wide range of sizes of materials may be discharged, in limited amounts, from the iii.
  • a method of beneficiating run-of-mine friable mineral material comprising the steps of subjecting such material including relatively coarse, medium and fine size ranges thereof to autogenous grinding Within a mill to reduce all size ranges thereof, removing a portion of se lected size ranges of said material larger than said fine size ranges from the mass of the material being reduced, subjecting said removed material to treatment while not co-mingled with said mass comprising the steps of classifying the same by screening into at least two general size ranges and beneficiating the coarsest size range'by subjecting the same to magnetic separation to effect a separa: tion of material values therein from waste material, and returning to the mass of material beingreduced any part of said separated material requiring further reduction.
  • a method of beneficiating run-of-mine friable mineral material comprising the steps of subjecting such material including relatively coarse, medium and time size ranges thereof to autogenous grinding within a mill to reduce all size ranges thereof, removing a portion of se lected size ranges of said material larger than said fine size ranges from the mass of the material beingreduced, subjecting said removed material to treatment while not co-mingled with said mass comprising dividing the same into two components and subjecting one of said components to further reduction in size and subjecting the other component to a beneficiation step to elfect a separation of Waste material from value material therein, subjecting one of the materials separated by said beneficiating step to additional size reduction, and returning to the mass of material being reduced any part of said separated material requiring further reduction.
  • a method of beneficiating run-of-mine friable mineral material comprising the steps of subjecting such material including relatively coarse, medium and fine size ranges thereof to autogenous grinding within a mill to educe all sizes ranges thereof, removing a portion of selected size ranges of said material larger than said fine size ranges from the mass of the material being reduced, and subjecting said removed material to treatment while not co-mingled with said mass comprising etfecting a plurality of size range separations, subjecting each size range portion to division and, subsequently subjecting one divided portion thereof to further reduction and subjecting the other divided portion to beneficiation to produce fractions respectively comprising value and waste material.
  • a method of treating run-of-mine friable mineral material comprising the steps of subjecting such material including relatively coarse, medium and fine size ranges thereof'to autogenous grinding within a mill to reduce all size ranges thereof, removing a portion of selected media.
  • :to feed run-of-mine material to tively medium size material means to return to the tumbling mill any desired portion size ranges of said material larger than said fine size ranges from the mass of the material being reduced, subjecting said removed material to treatment while not comingled with said mass and comprising the steps of classifying said remove-d material by screening to separate it into at least two general size ranges, further treating the coarsest of said size ranges by dividin the same into two "components, subjecting one divided component of said coarsest size ranges to a further beneficiating step, and beneficiating the other divided component of said coarsest size ranges and returning one portion thereof to said mill to effect further autogenous reduction.
  • a method of treating run-of-mine friable mineral material comprising the steps of subjecting such material including relatively coarse, medium and fine size ranges thereof to autogenous grinding Within a mill to reduce all size ranges thereof, removing a portion of selected size ranges of said material larger than said fine size 'ranges from the mass of the material being reduced, di-
  • a method of treating run-of-mine' friable mineral "material comprising the steps of subjecting such material including relatively coasre, medium and fine size ranges thereof to autogenous grinding within a mill to reduce all size ranges thereof, removing a portion of selected size ranges of said material larger than said fine size ranges from the mass of the material being reduced,
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill having inlet and exit means therein, means said inlet means of said mill for simultaneous reduction of all sizes of such material including relatively coarse, medium and fine size ranges thereofjmeans to discharge from said exit of said mill line and medium size ranges of material of predetermined maximum size, means to size the discharged material and segregate said material into relatively fine and relatively medium size ranges, means to effect a selection of a portion of said medium size ranges of material, means to treat said selected portion of said relato beneficiate the same, and
  • the mill system according to claim 9 including additional means operable to return to the tumbling mill the relatively medium size ranges of material which are not beneficiated.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill having inlet and exit means therein,
  • the mill system set forth in claim 9 further characterized by said sizing means comprises screen means, and said mill system further including means to receive the sized ranges of material from said screen means, and said means to select a portion of said medium size ranges of material comprising dividing means adjustably positionable relative to said receiving means and operable to separate said desired portion of medium. size range of material from the material received by said receiving means and feed the same to said treating means for benefieiating the same.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill having inlet and exit means therein, means to feed run-of-mine material to said inlet means of said mill for simultaneous reduction of all sizes of such material including relatively coarse, medium and fine size ranges thereof, diaphragm means adjacent said exit means having openings therein to discharge therethrough from the grinding zone of said mill fine size ranges of material of predetermined maximum size, said diaphragm also having a minor number of discharge opening means of larger size than said aforementioned openings and of a total area substantially less than the total area of said aforementioned openings also to disgrinding zone a restricted amount of material of predetermined maximum size, means to classify said discharged size ranges of material discharged from said mill and segregate said material at least into relatively fine and relatively medium size ranges, adjustable means operable to receive said medium size ranges from said segregating means and divide the same, means to receive and treat a divided portion of said medium sized material to beneficiate the same,
  • a mill system for autogenous grinding and treatment of friable mineral material comprising an autogenous tumbling mill having inlet and exit means therein,
  • diaphragm means adjacent said exit means having openings therein to discharge therethrough from the grinding zone of said mill fine size ranges of material of predetermined maximum size, said diaphragm also having a minor number of discharge opening means of larger size than said aforementioned openings and of a total area substantially less than the total area of said aforementioned openings also to dis charge from said grinding zone a restricted amount of material of predetermined maximum size, means to discharged from said mill and segregate said material at least into relatively fine and relatively medium size ranges, means to divide said medium size ranges into several desired portions, means independently of said autogenous mill operable to receive and further reduce the size of at least one of said desired portion of said relatively medium sized material, and means to return to said autogenous mill any desired portion of said further reduced medium sized portion for still further reduction of the size thereof.
  • the mill system set forth in claim 9 further characterized by said treating means comprising a magnetic separator, and adjustable means to receive separated fractions therefrom.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill having inlet and exit means therein, means to feed run-of-mine material to said inlet means of said mill for simultaneous reduction of all sizes of such material including relatively coarse, medium and line size ranges thereof, means to discharge from said exit of said mill relatively fine and a restricted amount of a relatively medium sized range of material, means to receive and classify the discharged size ranges of material from the grinding zone of the mill and segregate said material at least into relatively fine and relatively medium size ranges, means to effect a selection of a desired fraction of said classified medium size ranges of material, means to treat at least said selected fraction of said sized medium range of material to beneficiate the same, an auxiliary autogenous mill, and means to feed a desired portion of said beneficiated relatively medium size fraction of material to said auxiliary autogenous mill to serve as grinding media therefor.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an auto genous tumbling mill having inlet and exit means therein, means to feed run-of-mine material to said inlet means of said mill for simultaneous reduction of all sizes of such material including relatively coarse, medium and fine size ranges thereof, means to discharge from said exit of said mill time and medium size ranges of material of predetermined maximum size, means to size the discharged material and segregate said material into relatively fine and relatively medium size ranges, means to divide said medium size material into two portions, means to treat one of said divided portions of said relatively medium size material to beneficiate the same, and means to receive and further reduce in size the other divided portion of said relatively medium size material.
  • the mill system according to claim 18 further including an auxiliary size-reduction means, and material directing means communicating with said dividing means to receive said other divided portion of said relatively medium size material and operable selectively to direct said other divided portion either to said autogenous tumbling mill or to said auxiliary size-reduction means for further reduction in size.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill, means to feed run-of-rnine material thereto for simultaneous reduction of all sizes of such material including relatively coarse, medium and fine size ranges thereof, means to discharge from said mill medium and fine sizes of a predetermined maximum size and a minor restricted proportion of coarse size range, screening means positioned to receive said material discharged from said mill, said screening means being arranged and operable to separate said fine and medium size ranges from each other and including means otherwise arranged and operable to separate said restricted proportion of coarse material from said medium size ranges, means to divide said medium sized material into separated portions, beneficiating means, means to direct one of said divided portions of medium sized material to said beneficiating means for treatment thereby, additional size-reducing means, and means selectively operable to direct the other divided portion of medium sized material to said autogenous mill or to additional size-reducing means for further reduction in size.
  • the mill system according to claim 20 further including directing means positioned to receive said one divided portion after being beneficiated and operable selectively to direct any desired portion of said beneficiated material to said autogenous mill or to said additional sizereducing means for further reduction.
  • a mill system for autogenous grinding and beneficiation of friable mineral material comprising an autogenous tumbling mill, means to feed run-of-mine material thereto for simultaneous reduction of all sizes of such material including relatively coarse, medium and fine size ranges thereof, means to discharge from said mill medium and fine sizes of a predetermined maximum size and a minor restricted proportion of coarse size range, screening means positioned to receive said material discharged from said mill, said screening means being arranged and operable to separate said fine and medium size ranges from each other and being otherwise arranged and operable to separate said restricted proportion of coarse material from said medium size ranges, means to divide said coarse material into separated portions, beneficiating means, means to direct one of said divided portions of coarse material to said beneficiating means for treatment thereby, additional size reducing means, and means selectively operable to direct the other divided portion of said coarse material to said mill or to said auxiliary size,- reducing means for further reduction in size.
  • the mill system according to claim 22 further including directing means positioned to receive said one divided portion after being beneficiated and operable selectively to direct any desired portion of said beneficiated material to said mill or to said additional auxiliary sizereducing means for further reduction in size.
  • the mill system according to claim 22 further including additional dividing means positioned to receive and divide said medium size ranges of material into separated portions, additional beneficiating means, and means to direct one of said divided portions of medium size ranges of material to said additional beneficiating means for treatment thereby.
  • the mill system according to claim 24 additionally including means selectively operable to direct the other divided portion of medium size ranges of material to said mill or to said additional size-reducing means for further reduction in size.
  • a method of treating run-of-mine friable mineral material in a size reducing system comprising the steps of subjecting such material to autogenous grinding Within a mill to reduce all size ranges thereof, removing from the system a fine size range, selecting and removing from the mill a size range of said material larger than said fine size range from the mass of the material being reduced, subjecting a controlled portion of said selected material to a size reduction step While not co-mingled with said mass in said mill, and returning said portion to said mass for further reduction thereof.
  • a mill system for autogenous grinding and treatment of friable material comprising an autogenous tumbling mill having inlet and exit means therein, means to feed run-of-mine material to said inlet means of said mill for simultaneous reduction of all sizes of such material, means to discharge from said exit of said mill fine and medium size ranges of material of predetermined maximum size, means to size the discharged material and segregate said material into relatively fine and relatively medium size ranges, adjustable means to select a portion of said medium size ranges of material, means to reduce the size of said selected portion of said relatively medium size material, and means for returning the remaining portion of said medium size ranges of material back to the grinding zone of the autogenous grinding mill.
  • the mill system set forth in claim 27 further characterized by the diameter of the internal grinding zone of the mill being substantially greater than the axial length thereof.
  • the mill system set forth in claim 27 further characterized by the sizing means being capable of varying the size of the medium size range as discharged from the grinding zone of the mill substantially independently of the fine sizes, said sizing means comprising aperture means Within said mill.
  • the mill system set forth in claim 27 further including means to vary the quantity of medium size ranges References Cited by the Examiner UNITED STATES PATENTS Spitzer et a1.
  • Horsfield 241-26 X Erickson 241-20 Dowesett 241-80 X Fern et a1.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
US229288A 1962-10-05 1962-10-05 Beneficiation means and methods for autogenous grinding systems Expired - Lifetime US3231204A (en)

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BE638271D BE638271A (xx) 1962-10-05
US229288A US3231204A (en) 1962-10-05 1962-10-05 Beneficiation means and methods for autogenous grinding systems
GB37700/63A GB995114A (en) 1962-10-05 1963-09-25 Improvements in or relating to the treatment of run-of-mine friable material
FR949508A FR1376790A (fr) 1962-10-05 1963-10-03 Perfectionnements relatifs au traitement de tout-venant d'une matière friable
SE10872/63A SE310345B (xx) 1962-10-05 1963-10-04

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BE (1) BE638271A (xx)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715083A (en) * 1970-12-17 1973-02-06 Bethlehem Steel Corp Method for controlling the grind in a single stage autogenous grinding mill
US3799458A (en) * 1971-07-05 1974-03-26 Polysius Ag Lifting wall construction for a tube mill or the like
US3951347A (en) * 1972-09-21 1976-04-20 Polysius Ag Apparatus for crushing material containing particles that are hard to pulverize
WO1983001914A1 (en) * 1981-11-27 1983-06-09 Borell, Carl, Michael An autogenous grinding method
CN104668053A (zh) * 2015-03-13 2015-06-03 苏州圣谱拉新材料科技有限公司 一种弹片球磨机

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* Cited by examiner, † Cited by third party
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FI851608L (fi) * 1984-04-30 1985-10-31 Gen Mining Union Corp Foerfarande och anordning foer behandling av malm.
CN102836760A (zh) * 2011-06-25 2012-12-26 顾开明 一种带加强筋的篦板衬板

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US2211396A (en) * 1935-06-28 1940-08-13 Saskatchewan Potash Process of treating sylvinite ores
US2269912A (en) * 1939-01-04 1942-01-13 Raymond B Ladoo Method of treating ores
US2290686A (en) * 1939-05-26 1942-07-21 Edwin L Wiegand Treatment of material particles
US2319394A (en) * 1940-04-05 1943-05-18 Chemical Construction Corp Beneficiation of low grade coal
US2332701A (en) * 1940-06-12 1943-10-26 Charles W Dowsett System and method of grinding
US2668667A (en) * 1950-05-08 1954-02-09 American Cyanamid Co Separation of coarse light minerals in multiple cyclone-separator stages
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US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same
US3078049A (en) * 1959-06-24 1963-02-19 Hardinge Co Inc Mill and process for autogenous grinding of friable material
US3081954A (en) * 1960-06-27 1963-03-19 Harsco Corp Method and apparatus for recovering reusable metallics from steel making slag and refuse
US3086718A (en) * 1959-04-06 1963-04-23 W E Plechaty Co Method and apparatus for separating metallic particles

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US1315349A (en) * 1919-09-09 spitzer and c
US1461977A (en) * 1923-07-17 Sydney edward thacker ewing and joseph leonard willey
US1392887A (en) * 1918-07-15 1921-10-04 Broadley Joseph Richard Machine for grinding ores, mineral stones, and the like
US2211396A (en) * 1935-06-28 1940-08-13 Saskatchewan Potash Process of treating sylvinite ores
US2160169A (en) * 1936-06-18 1939-05-30 Smidth & Co As F L Mill
US2269912A (en) * 1939-01-04 1942-01-13 Raymond B Ladoo Method of treating ores
US2290686A (en) * 1939-05-26 1942-07-21 Edwin L Wiegand Treatment of material particles
US2319394A (en) * 1940-04-05 1943-05-18 Chemical Construction Corp Beneficiation of low grade coal
US2332701A (en) * 1940-06-12 1943-10-26 Charles W Dowsett System and method of grinding
US2668667A (en) * 1950-05-08 1954-02-09 American Cyanamid Co Separation of coarse light minerals in multiple cyclone-separator stages
US2723029A (en) * 1951-04-24 1955-11-08 Int Minerals & Chem Corp Ore beneficiation method
US2922586A (en) * 1954-02-18 1960-01-26 Hardinge Harlowe Comminuting and classifying system and method
US2950869A (en) * 1955-09-19 1960-08-30 Mine And Smelter Supply Compan Ball mill grates
US2962231A (en) * 1957-04-16 1960-11-29 Weston David Beneficiation of ores
US3086718A (en) * 1959-04-06 1963-04-23 W E Plechaty Co Method and apparatus for separating metallic particles
US3078049A (en) * 1959-06-24 1963-02-19 Hardinge Co Inc Mill and process for autogenous grinding of friable material
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US3081954A (en) * 1960-06-27 1963-03-19 Harsco Corp Method and apparatus for recovering reusable metallics from steel making slag and refuse

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715083A (en) * 1970-12-17 1973-02-06 Bethlehem Steel Corp Method for controlling the grind in a single stage autogenous grinding mill
US3799458A (en) * 1971-07-05 1974-03-26 Polysius Ag Lifting wall construction for a tube mill or the like
US3951347A (en) * 1972-09-21 1976-04-20 Polysius Ag Apparatus for crushing material containing particles that are hard to pulverize
WO1983001914A1 (en) * 1981-11-27 1983-06-09 Borell, Carl, Michael An autogenous grinding method
CN104668053A (zh) * 2015-03-13 2015-06-03 苏州圣谱拉新材料科技有限公司 一种弹片球磨机

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GB995114A (en) 1965-06-16
FR1376790A (fr) 1964-10-31
BE638271A (xx)

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