Abstract: The invention relates to a method and to apparatus for crushing brittle material for grinding using a material bed roll mill, in which at least a proportion of the branch stream returned to the roll gap is dried to such an extent that a mixed moisture content which lies below a critical moisture content is produced in the roll gap. In this way it is possible even for material for grinding which has a high moisture content and above a critical moisture value has a tendency to sticking and/or caking on to be crushed satisfactorily.

Abstract: A method of preparing wastepaper for fiberization comprising: (a) shredding the wastepaper in a screened shredding device, through which the wastepaper is drawn by a fan; (b) passing the resulting shredded-and-screened wastepaper through the fan, wherein wadded-up pieces of wastepaper which passed through said screen are opened up; and (c) screening out opened-up pieces of wastepaper.

Abstract: A toner for producing electrostatic latent images is produced by classifying a pulverized feed material into a coarse powder and a fine powder in a first classifying means, pulverizing and recycling the coarse powder to the first classifying means, introducing the fine powder into a multi-division classifying chamber divided into at least three sections where the fine powder is classified into at least a coarse powder fraction, a medium powder fraction and a fine powder fraction. The medium powder fraction is recovered to provide a toner. The coarse powder fraction is recycled to the first classifying means.

Abstract: A method and apparatus for grinding brittle stock such as cement clinker to form finished cement, passing the grinding stock through a first roller press having pressure and nip capabilities to do product bed comminution which is unique in self particle destruction causing incipient cracks in the inside of the product particles which are delivered from the press in agglomerations or scabs, the agglomerated scabs are delivered to a second roller press of larger capacity, which also does product bed comminution, de-agglomerating the scabs after the second roller press, classifying the de-agglomerated product and recirculating the coarse fraction back to the second roller press and possibly also to the intake of the first roller press.

Abstract: A centrifugal fluidized grinding apparatus having balls as a grinding medium therein, comprises a parting vessel having a vertical axis, composed of inner and outer vessel parts both forming a circumferential groove. The circumferential groove has a continuous and smooth surface and provides a completely open inner space allowing the grinding medium and starting material to move freely through any part of the entire area of the inner space without encountering any obstacles. The groove has a generally ovoid profile with an upper part thereof cut away in a vertically cross-sectional view taken along a plane including the axis. The ovoid has a longitudinal axis intersecting the vertical axis at a position over the parting vessel. The inner and outer vessel parts are mounted for relative rotation about the vertical axis, in such a manner that the inner vessel part is rotated while the outer vessel part is stationary, or the latter is rotated in a reverse direction.

Abstract: An apparatus for supplying a controlled flow of pneumatically transported solid particles, in particular, pulverized coal, comprises a pulverizer or vessel for containing pneumatically suspended solid particles. A supply pipe is connected to the pulverizer or vessel for removing a mixture of pneumatic gas and solid particles from the vessel. A bend is provided in the supply pipe and an aspirator is connected to the supply pipe at a distance of from one to two pipe diameters from the bend. The aspirator is provided on the outer wall of the bend and is supplied with aspirating gas to draw off an amount of mixture from the supply pipe. This controls the amount of remaining flow of mixture through the pipe. The supply of the aspirator is connected to a bypass line which is connected to the mixture inlet of an injector which is supplied with injecting gas. The supply of the injector which carries the mixture is connected back into the vessel.

Abstract: A jet air flow crusher has a guide face formed by the inside surface of an outer wall in which a flat and almost ellipsoidal internal space is defined to guide an ellipsoidal gas phase flow powder grains; a crushing zone in which flowing powder grains are crushed provided on one side of the internal space in the direction of the ellipsoidal major axis; a classifying zone at which flowing powder grains are discharged provided on the other side of the internal space in the direction of the ellipsoidal major axis; a gas phase flow passage defined in the crushing zone by the inside surface of the outer wall and a partition wall; nozzles installed in the outer wall and the partition wall at several locations in the direction of the powder grain flow in the crushing zone to jet out air in a direction substantially corresponding to the powder grain flow for carrying and crushing the powder grains, and flow resisting means for limiting the gas phase flow carrying the powder grains, arranged at least at one location b

Abstract: A shredder (1) is surrounded by a revolving screen (3) which also acts as an elevator. Said shredder outputs the shredded material in the interior of said screen (3), which allows the exit of the smaller material through the holes and lifts the remaining material depositing it once more at the input of the shredder (1). According to the present invention the bottom surface of the drum faces a fixed wall (8) placed at such a distance that it determines the third dimension of the material which passes through.

Abstract: A wet grinding machine which includes a grinder head, an annular stator having a mounting portion mounted on the grinder head and joined by a body portion to a skirt portion, and a rotor rotatably mounted on the grinder head. The rotor includes a hub portion joined by an annular body portion to an annular skirt portion inside of the annular stator. Outwardly extending slots in the body portion of the rotor define shearing blades in the body portion. Outwardly extending shearing slots in the body portion of the stator are opposed to the shearing blades. Each of the shearing slots slopes and overlaps at least one adjacent shearing blade. As the rotor turns, each of the blades is constantly opposed to and addresses at least one of the shearing slots. There are inlet openings in the stator skirt and in the rotor skirt.

Abstract: A disintegrator comprises a housing (1) and a grinding chamber (2) accommodating grinding wheels mounted on shafts (9, 10) of electric motors. The peripheral zone of the chamber (2) accommodates inclined plates (13) of a classifier arranged about the circumference so that an annular slot (14) is formed between these plates and a cylindrical portion (3) of the chamber (2) through which the chamber (2) communicates with a separator (15). The separator (15) embraces one of the electric motors (11) and communicates by way of a passage (21) of return flow of air with an air distributor (22) embracing the electric motor (12). The distributor (22) is connected to the chamber (2) by way of annular slot (24) between the plates (13) of the classifier and the last grinding wheel (8) of the rotor. Connected to the separator (15) is a collector (18) of fine fraction of the material.

Abstract: A pulverizing mill (10) wherein the pulverized material is classified by a vertical separator (38) as the pulverized material exits the pulverizing mill thus permitting the height of the mill to be reduced.

Abstract: An apparatus for treating a particulate material comprising a casing defining a treating chamber and rotatable at high speed to produce a centrifugal force for pressing the material in the casing against an inside wall surface of the casing. Treating members such as pulverizing members are disposed in the casing for revolution relative to the inside wall surface of the casing. The treating chamber has a discharge opening for permitting overflows of the material under treatment. The discharge opening is disposed adjacent a center of rotation of the casing, and a limiting device is provided adjacent the discharge opening for limiting the overflows of the material under treatment. A classifier is provided to communicate with the discharge opening of the treating chamber for receiving treated material.

Abstract: A method and apparatus for the two-stage crushing of brittle material comprising a roll mill and a mill connected downstream thereof, the output of the second mill being delivered to a sifter in which a second branch stream of the grit obtained in the sifting operation is returned to the roll mill and a further branch stream is returned to the second mill. A first control circuit keeps the sum of the quantity of fresh material and the quantity of grit constant, while a second control circuit divides the quantity of grit into two branch streams in such a way that the drive power of the roll mill remains constant.

Abstract: A method and apparatus for the two-stage crushing of brittle material comprising a roll mill and a second mill downstream thereof, the output of the second mill being delivered to a sifter. The quantity of grit obtained in the sifting operation is divided between the roll mill and the second mill in such a way that the sum of the quantity of fresh material and the quantity of grit delivered to the roll mill remains constant.

Abstract: A coal-water slurry producing system comprises: a continuous wet-type ball mill for grinding the coal with the addition of water and additives thereto to obtain coal-water slurry, supplying device for supplying the coal-water slurry discharged from the ball mill to a filtering apparatus, for filtering the supplied coal-water slurry to remove coal particles of a predetermined particle size or above, delivery device for delivering the filtered coal-water slurry containing coal particles of the predetermined particle size or below to a slurry storage tank, and a combustion apparatus. The coal-water slurry producing system further comprises a screen apparatus disposed at an exit of the ball mill to remove coarse coal particles contained in the coal-water slurry, and recovery device for recovering the removed coarse coal particles at an entrance of the ball mill.

Abstract: A vane wheel assembly (12) particularly suited for use in a mill (10) so as to be operative to effect a primary classification of the material such as coal that is subjected to pulverization within the mill (10). The subject vane wheel assembly (12) includes a first channel-like means (40) mounted in supported relation on the bowl (16) of the mill (10) for rotation therewith and so as to lie in a first plane which extends in a first direction. The subject vane wheel assembly (12) further includes a second channel-like means (42) mounted in fixed relation on the interior of the millside area (15) of the mill (10) at the exit end of the first channel-like means (40) so as to extend a full 360.degree. around the circumference of the millside area and so as to lie in a second plane that extends in a second direction which is inclined at a predetermined angle to the first plane of the first channel-like means (40).

Abstract: Apparatus and method for the pulverization and burning of solid fuels, such as coal, that provides for introducing relatively coarsely divided solid fuel into the lower part of an upstanding, closed housing for impact crushing therein, and for carrying the fuel fines upwardly through a turbulent zone defined in the housing between rotating spiders that include widely spaced radial blades that are oppositely angled to generate opposing air flows to further pulverize the entrained fuel fines autogenously by attrition. The entrained fuel fines in the rising column of air are then discharged from the housing into a burner for the pulverized solid fuel.

Abstract: An impact crushing machine for finely and effectively pulverizing materials includes impact plates disposed on one side of a rotary plate and classifying blades disposed on the other side of the rotary plate. A fine grain exhaust outlet and a coarse grain exhaust outlet are disposed facing to the classifying blades. The coarse grain outlet is directly coupled with a supply path for the materials to form a circulating path, and a raw material supply pipe is coupled with the supply path.

Abstract: A separator-disintegrator includes a casing accommodating a rotor, a rotor drive, a pipe to charge material to be separated and pipes to discharge fine and coarse fractions of material. The rotor is embraced by an annular chamber installed in the casing and facing the rotor with its open portion. An inner space of the chamber makes up a material separation zone. Side walls of the chamber have openings to communicate the chamber with the pipe to discharge fine fraction of material. The pipe to discharge coarse fraction of material, which communicates with the chamber, has a damper mounted for longitudinal movement.

Abstract: A mechanism and method for the comminuting and grinding of brittle grinding stock including a roll press with the material passed from the roll press to a deagglomeration drum which co-rotates with the tube mill. The material from the deagglomeration drum is passed to the tube mill and the material from the tube mill being passed to a separator. In one form the material from the separator is passed to a second separator and the coarser products from the second separator are led back to the tube mill with an airstream conducting the finer material from the tube mill to the first separator.

Abstract: The invention concerns an apparatus for charging at least one top-loading crusher (1) with material which is fed batchwise by a plurality of transport vehicles (2) and is introduced into the crusher (1) by a bucket (5) which is loaded in each case by at least one transport vehicle (2) in a receiving position (A) adapted to the plane of movement of the transport vehicle (2) and can be raised into a transfer position (B) in which the bucket (5) is tipped in order to empty it into the crusher (1), the crushed material being withdrawn from the crusher (1) by means of a conveyance device (3).

Abstract: A process and a secondary pulper used in a system for waste paper conditioning wherein the secondary pulper has a tumbling space separated from an accepted stock space by a screen. The secondary pulper includes a central drain line through which a fraction of fiber suspension enriched with light dirt is removed at one end of the secondary pulper, and a circumferential line through which a fraction of the fiber suspension enriched with heavy dirt is removed from the secondary pulper. A pulp inlet sleeve surrounds the central drain line and receives fiber suspension enriched with heavy dirt from the circumferential drain line through a conduit from the circumferential drain line to the pulp inlet sleeve so that the fiber suspension enriched with heavy dirt enters the tumbling space adjacent the entrance to the central drain line.

Abstract: A method and apparatus for continuous pressure comminution of brittle grinding stock such as cement clinker wherein simultaneous operations of unit grain comminution and product bed comminution are carried out in the roller gap of the same roller machine in such a manner that the grinding stock is first precomminuted by means of the unit grain comminution in a wider roller gap and immediately thereafter, the grinding stock fragments produced in the unit grain comminution are further comminuted by the technique of product bed comminution in the region of the narrowest roller gap. The continuous pressure comminution is characterized by a high pressure of more than 2 metric tons per centimeter of roller length, with a sifter being provided after the pressure roller.

Abstract: A gun-target apparatus and method for producing silicon seed particles from silicon feed particles comprising accelerating silicon feed particles from a container and propelling them into a silicon target in a target chamber. The target is movable within said chamber so that a different portion of the silicon target is exposed to the oncoming seeds. The seeds are accumulated in a receiver and separated from silicon dust and larger feed particles.

Abstract: A method and apparatus for two-stage crushing of material wherein the material is subjected to crushing first in a constant speed roll mill and then in a second mill. Grit resulting from the crushing is returned to the first mill in a proportion to maintain the filling level of combined fresh material and grit substantially constant even when the quantity of such fresh material changes.

Abstract: An apparatus for comminuting waste material such as waste plastic sheet material, into progressively smaller pieces until a desired size is reached that may be recycled. The apparatus has a set of slowly rotating, intermeshing scissor rolls for receiving the waste material and shearing the material into smaller pieces. A paddle wheel conveyor receives the smaller pieces from the scissor rolls and moves the smaller pieces over a screen with the undersized smaller pieces passing through the screen defining the desired reduced size. The oversized smaller pieces that do not pass through the screen are reprocessed back to the scissor rolls by the paddle wheel conveyor. A vacuum pump draws air through the apparatus and the screen to facilitate the separation on the screen and entrains the undersized pieces in an air stream to convey the pieces from the apparatus.

Abstract: There is disclosed in a unitized automotive vehicle tire shredding system a rotating drum type elevator for receiving from a screening device heterogeneously mixed scraps of shredded tires or the like which include components of curvilinear shape and resilient characteristics. The drum carries the scraps to an elevated point of discharge to fall therefrom by gravity into a shredding machine and from there down again upon the screening device. The drum includes an annular trough-like portion for carrying the scrap when deposited into a lower portion thereof upwardly to the point of discharge when the drum is rotated, and a material travel control device comprising a trough-shaped channeler of convergent sectional form having side walls peripherally configured to complement the curvatures of said rim and flange wall members.

Abstract: A compactly unitized machine for shredding waste automotive vehicle tires or the like comprising a frame, a shredder, a shredded scrap receiving classifier, and an elevator for carrying oversized scraps rejected by the classfier back to the shredder; said frame, shredder, classifier and elevator are of such configurations and are so relatively arranged and supported upon said frame as to comprise a compactly unitized three-dimensionally minimally sized unit. The classifier per se is of improved construction and operating characteristics.

Abstract: A vertical mill, a classifier for the mill, and a controller for the classifier. The vertical mill includes a casing having a top plate, and the classifier is adjacent the top plate. Beneath the top plate, upon which impinges an upwardly moving gas and powdery material being supplied from the lower portion of the casing, are provided a plurality of rotary blades or rotary rods which have a vertical axis of rotation. A gap is provided between the rotary blades and the top plate, and an annular impingement member is suspended from the top of the casing to outwardly surround the plurality of rotary blades in such a way as to shield the gap. Further, an opening is provided adjacent the impingement member through which a portion of the gas and powdery material pass. The controller of the classifier includes means for adjusting the opening through which the powdery material passes.

Abstract: An agitating mill, particularly an agitating ball mill, comprising a housing having an inlet for material to be ground and for air, an outlet for fines and air, and at least one horizontal agitator shaft which is provided with agitating members. The outlet for fines and air has a large area and is provided in the top wall of the housing and extends throughout the length and width of the top wall of the housing. A plurality of agitator shafts are preferably provided which are juxtaposed and superposed.

Abstract: A disintegrator includes a grinding chamber (1) accommodating grinding rotors. The housing of the chamber (1) includes a cylindrical portion (7) having an outlet pipe (19) for evacuating the material and two side walls (9 and 10) one of which, particularly wall (9) has a feeding pipe (12). The cylindrical portion (7) can be turned relative to the side walls (9 and 10) the desired position being fixed by locking assemblies (11) arranged about the periphery of the cylindrical portion (7). Each locking assembly (11) includes a pressure plate (13). One end of the pressure plate (13) bears on a projection (15) provided on one of the side walls (10), whereas the other end is received by an annular groove (16) made on the outer surface of the cylindrical portion (7) of the housing. In addition, the plate (13) is secured to the side wall (10)having the projection (15) by a bolt ( 14).

Abstract: In a pulping apparatus including a pulper with a rotor near the bottom therein, the pulper having a sluice outlet at the bottom for acceptable pulp suspension. Above the rotor at a corner of the pulper is a second outlet for suspension and dirt. A conduit leads from the second outlet to a horizontally oriented withdrawal apparatus chamber having a suspension agitating rotor at the end of the chamber opposite the entrance for pulp thereinto. A tangential outlet from the withdrawal apparatus chamber leads to a rotary, perforated sorting drum which permits exit of acceptable suspension and which has a rejected suspension and dirt outlet. A valve in the inlet to the withdrawal apparatus chamber is periodically and cyclically opened to permit periodic replacement of the suspension in the withdrawal apparatus chamber, and the suspension which has been agitated in the withdrawal apparatus chamber then moves to the sorting drum.

Abstract: A vane wheel arrangement (30) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effecting therewithin the pulverization of materials such as coal. The subject vane wheel arrangement (30) which is positioned within the bowl mill (10) so as to be located in the path of flow of the air that in flowing through the bowl mill (10) transports therewith the pulverized material, is operative to effect a primary classification of the pulverized material. Encompassed within the subject vane wheel arrangement (30) are vane means (36) supported on the rotatable grinding surface (14) of the bowl mill (10) for rotation therewith, and a converging/diverging orifice means (38) located in spaced relation to the rotatable grinding surface (14). Both the vane means (36) and the exposed surfaces of the converging/diverging orifice means (38) are formed of a material that is noted for its good abrasive resistant qualities.

Abstract: The present invention is concerned with a pressure chamber grinder equipment in which finely divided material is ground to ultra-finely divided particles at each other at an elevated pressure. The objective of the invention is to achieve maximal economies of energy and an optimal grinding process. The invention is characterized in that the equipment comprises at least one horizontal plug pipe (1) provided with a feeder funnel and with a push cylinder (2), a pressurized equalizing tank (3) connected to the plug pipe (3), a screw conveyor (4) being passed across the bottom portion of the tank (3) for the purpose of feeding the material in a loose state into a pre-grinder (6), at whose outlet side the material-gas flow is divided into component flows of precisely equivalent speed and composition, which component flows are passed each through a grinding nozzle (10) of its own, of the shape of a venturi tube, into the grinding chamber proper, the nozzles being directed conically towards each other.

Abstract: For impact grinding a free-flowing feed material to a finished product of a narrow grain size range, particularly in the cereal and feeding stuff grinding industry, the feed material is fed to an impact or hammer mill (1) having a sieve jacket (33), wherein it is subjected to a first impact grinding phase, during which a first finished product passes through the sieve jacket (33), while a recirculation material component is withdrawn from the grinding chamber (34) through exhaust means (51) provided on the sieve jacket (33), said recirculation material component being fed to a grain size separator means (4) comprising a sieve screen (44) for separating further finished product from an oversize component which is to be returned to the impact grinding phase, preferably together with newly introduced feed material.

Abstract: A jet-type grinding system for grinding relatively large particles, such as coal and the like, wherein the particles to be ground are entrained in a circulating gaseous vortex in which the particles are caused to pulverize each other, the system including a mill having a grinding chamber succeeded by a classifier section in which smaller ground particles are initially separated from larger ground particles, this classifier section constituting a primary separator, the primary separator being in operative connection with a secondary separator into which ground particles pass from the first separator for additional classification and separation into smaller and larger particles, and a tertiary separator inoperative connection wtih the secondary separator to provide passage from the secondary to the tertiary separator of ground particles for additional classification and separation of smaller from larger particles, the passage of all of the particles from one separator to the other being by centrifugal force, an

Abstract: A vertical roller mill has a grinding table (1), rollers (3) and a separator (6) for separating ground material, which is conveyed to the separator in an air stream supplied through an inlet (7), into a fine fraction, which passes out through an outlet (8), and a coarse fraction which is returned for further grinding through an outlet (10). A part of the ground material is conveyed through an outlet (11) to a second separator (13), where it is separated from the air and returned for further grinding via an outlet (14) and an inlet (9) for fresh material to the mill. This provides a flatter grain size distribution curve in the finish ground material.

Abstract: A pulverizer for pulverizing solid material such as coal in which the chmaber of the pulverizer has jets of fluid projected thereinto at high speed to cause the particles to impact against one another to effect the pulverizing and in which a sleeve is mounted within the pulverizer chamber so that the coarser particles which pass upwardly through the sleeve flow downwardly in the annular space between the sleeve and the chamber side wall, to be re-entrained by the nozzles and projected again into the sleeve for further impacting.

Abstract: A wet grinding machine which includes a grinder head, an annular stator mounted on the grinder head, and a rotor rotatably mounted in the grinder head. Shearing blades on the rotor turn inside the stator and sweep across shearing slots in the stator. Each of the shearing slots slopes and overlaps adjacent shearing slots so that each of the blades is constantly addressing an inner edge of at least one of the shearing slots. A classifying screen chamber surrounds the stator but is independent of the grinding machine so that particles of reduced size can pass through the screen to be removed while larger particles are retained and sheared by the rotor blades against inner edges of the slots.

Abstract: A material grinding mill having a grinding chamber with a closed bottom, a material feed disposed to force ground material to move axially of the rotary grinder to an outlet at one or both sides of the grinding chamber, a scroll liner directed to lie adjacent the path of rotation of the grinder and form a venturi throat inlet to the grinding chamber, a supply of drying medium admitted to the mill to be sucked through the venturi throat for drying the material during the grinding while moving it through the side outlet, and a classifier for returning oversize material to the grinding chamber through the venturi throat.

Abstract: The invention provides an improved vertical type pulverizing and classifying apparatus comprising a lower, pulverizing chamber and an upper, classifying chamber, wherein a material under treatment is carried by gas streams. The disclosed apparatus includes a conduit between the pulverizing chamber and the classifying chamber for sending particles of the material emerging from a primary classification to the classifying chamber for a secondary classification. A floating chamber is provided circumferentially of the conduit to receive particles descending from the classifying chamber for a further classification, whereby resulting fine particles are blown back to the classifying chamber and coarse particles are returned to the pulverizing chamber by way of a material feeder.

Abstract: A pressure-chamber grinder comprises a grinder chamber of substantially circular section, which chamber is provided with a feed opening for the material to be ground, fed as a gas-tight plug, and the opposite end of which chamber is provided with an outlet opening for the ground material. Tangentially directed grinding-gas nozzles are fitted and are uniformly spaced around the entire circumference of the mantle face of the grinder chamber, or at least of part of same. The object of the present invention is to force the entire material flow to rush into every grinding zone.

Abstract: There is disclosed a grinding crusher having a grinder piece disposed within a crushing chamber for relative rotation with respect to a casing defining the crushing chamber. The casing is journaled and driven in high speed rotation so as to cause a material within the casing to be centrifugally pressed against the inner peripheral surfaces thereof.

Abstract: A system for separating and classifying whole tree wood chip material comprising essentially wood and bark overs, chips and bark fines which is supplied to a bin or receptacle. The chip material is augered in a forward direction in a monitored flow longitudinally away from the bin while passing it across a first stationary screen trough system having openings of a size to pass everything, while rejecting the overs. The acceptable chips and fines passed through the first screen trough system are then augered across a second stationary screen trough system having openings of a size to pass the fines to a fines trough, while retaining the acceptable chips. Finally, the acceptable chips are moved forwardly toward a chip discharge location while the fines passed through the second screen trough system are separately collected. The system includes mechanism for diverting chipped material unsuited to use in a paper mill, such as chipped tree tops, directly to the fines trough.

Abstract: The invention is directed to a method and apparatus for comminuting stumps. The apparatus includes a generally cylindrical stationary drum having a feed opening in the upper portion through which stumps are fed to the drum. A rotatable substantially horizontal bottom encloses the lower end of the drum and is disposed to rotate about a vertical axis so that the stumps are forced to the outer periphery of the drum under centrifugal force and revolve along with the bottom. An abutment or counter member extending upwardly from the bottom and the stumps are braced against the countermember as they are moved into engagement with a generally cured vertically disposed blade that is spaced inwardly of the drum. The blade acts to comminute the stump and the chips or particles are discharged from the drum through a discharge opening which is disposed radially outward of the blade.

Abstract: A system for pulverizing coal to be burned in a furnace (20), where nearly all of the coarse ash particles are removed from the coal prior to its introduction to the furnace. The system includes a pulverizing mill (10) having a first classifier (12) in its outlet for separating some of the large, heavy particles and returning them to the pulverizer. A second classifier (16) is connected to the first classifier, and includes a curved duct (16) wherein the solid particles being carried in an airstream are thrown outwardly against an outer wall. A skimmer blade (78) extending through the outer wall skims off a percentage of the large, heavy particles, the percentage depending on how much coarse ash the coal stream contains. The rest of the coal particles are conveyed to a furnace and burned therein. The separated large, heavy particles are passed through an ionizer (30) and then through an electrostatic separator (34), where the inorganic particles are separated from the coal particles.

Abstract: Apparatus for comminuting materials to extremely fine size includes a circulating stream jet mill and a discrete but functionally interconnected and interdependent rotating anvil-jet impact mill. New material is injected into the impact mill against a rotor, and the partly comminuted material is transferred to the jet mill with vortex feed into the jet mill. Uncomminuted material in the jet mill is reinjected into the impact mill. The two mills transfer the material back and forth until the particles are comminuted, classified, and removed from the jet mill. The anvil-jet mill is provided with stationary anvils and support for turning the rotor at increased velocity.

Abstract: A pulverizing machine in which alongside the pulverizer rotor 16 are a classifier zone 29 and a conveyor zone 41. The rotor 16 has pulverizer members 25 which project into an annular reducing zone 27. Guide means 17 is provided in the conveyor zone to provide spiral paths to convey a rotating flow of air and reduced material spirally inwards from one end part 45 of the reducing zone to the classifier zone 29, and the latter is positioned to allow oversize material particles to pass outwards from the classifier zone directly to said end part of the reducing zone while the undersize particles are carried inwards, optionally via a rotary classifier 18, to an outlet 15.

Abstract: Wood is removed from debris in processes alternately conducted in a pair of side-by-side water filled tanks. Each tank includes an inclined bottom defining a deep end where sinking materials settle and a shallow end. Water jets along two adjacent sides of each tank creating a flow of surface water and floating wood toward one corner of the shallow end where the wood accumulates and is removed. Runways along two sides of each tank support debris handling equipment. A conveyor under one runway transfers the sinking materials away from the tanks. The wood is comminuted and sized for use as fuel.

Abstract: A circulation classifying chamber having a coarse particle discharge duct connected to a peripheral position thereof and a fine particle discharge duct connected thereto about an axis of circulation, is provided with a baffle member, a nozzle and, as necessary, a rectifier. Particulate materials jetting out of the nozzle on high velocity gas flows violently collide with the baffle member to be crushed and given components of velocity in a direction of flow in the circulation classifying chamber. Thus, crushing and classification proceed in parallel.