Abstract: A particulate grinding method and device applies different force fields to drive the grinding medium and the particulates move in different routes but collide only at a grinding area so that they are separated naturally without conventional screening mechanisms, such as a screen or a gap, and prevented from the limitation of mechanical size of the components. Moreover, the invention is applicable to finer particulates. The circulation of particulates is not limited by any small gap of screening mechanisms, so the particulates ill not block the separator.

Abstract: The invention relates to a grinding circuit for use in a flue gas desulfurization system. The circuit comprises a mill for grinding limestone in water to form a limestone particle slurry. The thus-formed slurry is pumped to a hydrocyclone classifier which separates the limestone slurry into a slurry containing oversized particles that are to be reground in the mill and a slurry containing particles suitable for product which are sent to a product tank inlet for subsequent use in the flue gas desulfurization system. In the present system, the hydrocyclone classifier is elevated above the feed inlet into the mill but below the product tank inlet and, consequently, while the oversized particles are directed by gravity from the hydrocyclone to the mill feed inlet, the particles suitable for use in the flue gas desulfurization system are pumped from the hydrocyclone outlet to the product tank inlet.

Abstract: In the production of meal-fine products by a milling process the milling material generated in a comminuting device is ordinarily separated at the desired grain size in a downstream sifter and the fine material (meal-fine product) obtained here is then separated in the fine material separating device from the sifting air. According to the invention it is proposed to construct the sifter as a V-sifter and to connect this latter, without interposition of the otherwise ordinarily used pipelines, directly with the fine material separating device, preferably an electro-filter.

Abstract: A comminuting apparatus is provided which includes a frame, at least one drive motor, a set of overlapping scissor rolls and a recycle manifold. The frame has an enclosure with an entrance opening for receiving waste material. At least one drive motor is carried by the frame. The set of overlapping scissor rolls includes a first scissor roll and a second scissor roll carried within the enclosure for co-rotation and driven by the at least one drive motor, configured to draw material from beneath for delivery between the overlapping scissor rolls to subdivide the material. The recycle manifold is provided above and downstream of the scissor rolls and is configured to receive the subdivided material from between the overlapping scissor rolls.

Abstract: A comminuting apparatus is provided having a frame, a set of overlapping scissor rolls, a shear outtake manifold, and a pneumatic conveyor. The frame has an enclosure with an entrance for receiving waste material. The set of overlapping scissor rolls is carried for co-rotation within the enclosure. The scissor rolls are operative to comminute the waste material into subdivided pieces. The shear outtake manifold is configured to collect the subdivided pieces of waste material. The pneumatic conveyor includes a source of air flow and a pneumatic duct. The pneumatic duct communicates with an upstream of the shear outtake manifold, and is operative to deliver an airstream from the source of air flow into the shear outtake manifold. The airstream entrains the subdivided pieces and removes the subdivided pieces from the shear outtake manifold.

Abstract: In order to further develop a circuit grinding apparatus with a roller mill or roller press for material bed disintegration of granular material and with at least one integrated sifter, where the mill and the sifter are disposed within two stationary side walls between which a material conveyor ring is rotatably seated and can be set into rotation for an internal circulation of material in such a way that the rotatably seated material conveyor ring, which has a very large diameter and rotates in operation, is as light as possible and the rotary actuator is configured as simply as possible, it is proposed in accordance with the invention to dispose around the bottom circumferential area of the material conveyor ring more than two, for example four rolls supporting the ring on the bottom, where two adjacent bearing rolls in circumferential direction of the ring are positioned at the ends of at least one common rocker lever which, in turn, is supported on the machine frame via a tilting joint.

Abstract: The invention relates to a classifying mill with a housing configured for containing a stream of particulate material. A particulate material feed inlet is associated with the housing for introducing the particulate material into the housing. A milling assembly is disposed within the housing and configured for grinding the particulate material into fines and oversize particles. A classifier comprising a classifier rotor is disposed within the housing and below the milling assembly. A fines output at the underside of the classifier is configured for extracting the fines from the classifier, and an oversize particle collector at the underside of the classifier is configured for extracting the oversize particles from the housing. The classifying mill is arranged such that the particulate material stream extends downward from the feed inlet, through the milling assembly, and subsequently through the classifier.

Abstract: Two-stage classification of a granular material, in particular a cement grinding feed, is accomplished in two classifiers connected in series in such a way that the separative behavior or the separative action and thus the particle-size distribution of the undersized or finished material coming from the second classifier can be modified with simple resources. Part or all of the oversized material of the second classifier is recycled to the second classifier.

Abstract: A comminuting apparatus is provided which includes a frame, at least one drive motor, a set of overlapping scissor rolls and a recycle manifold. The frame has an enclosure with an entrance opening for receiving waste material. At least one drive motor is carried by the frame. The set of overlapping scissor rolls includes a first scissor roll and a second scissor roll carried within the enclosure for co-rotation and driven by the at least one drive motor, configured to draw material from beneath for delivery between the overlapping scissor rolls to subdivide the material. The recycle manifold is provided above and downstream of the scissor rolls and is configured to receive the subdivided material from between the overlapping scissor rolls.

Abstract: Provided is, among other things, and together with associated methods, a powder feed comprising: a venturi comprising an external gas inlet, a gas outlet through which gas flows at a rate amplified over a gas flow rate into the external gas inlet, and an internal gas inlet; and a cyclone with an intake port connected to the venturi gas outlet, a recycle outlet port, and a product port, wherein a gas flow rate FS into the venturi external gas inlet results in an enhanced flow rate into the cyclone intake port.

Abstract: A grinding plant comprising: a high-pressure roller press for crushing raw material into fragments; a static cascade sifter for shifting the fragments from the high-pressure roller press into fine fragments and coarse fragments, the coarse fragments being returned to the high-pressure roller press; and a separator for separating the fine fragments from the static cascade sifter into fine product fragments and less fine reject fragments, at least some of the less fine reject fragments being returned to the static cascade sifter without first pasing through the high-pressure roller press.

Abstract: An improvement to the conventional grinding mill and separator designs which facilitates the use of larger diameter grinding surfaces and additional numbers of grinding rollers by equalizing the gas velocity around the grinding rollers and journal with the gas velocity employed to fluidize the feed particulate material. A plurality of peripheral vertical static separators are located about the grinding chamber and above the grinding rollers to provide an increase in the cross-sectional area of the grinding mill vertical shaft, thereby reducing the gas velocity around the grinding rollers and journal. The peripheral vertical static separators are configured with a trapezoidal sectional area, such that oversize particulate material falling into the peripheral vertical static separators is redirected into the grinding chamber, resulting in an increase in the number of grinding chamber material introduction points.

Abstract: The invention relates a pulverizer equipped with a free air purging mechanical seal/classifier design that provides free air purging of the seal gap between the mechanical seal assembly and the classifier. The invention also provides a coarse particle extraction assembly wherein the coarse particles rejected by the classifier can be reliably discharged from the pulverizer or recirculated to the inlet. Furthermore, the rejected coarse particles can be subjected to jet milling and then recirculated. The invention also provides a free air cooling arrangement for cooling both the lower bearing member and the area of the vertical drive shaft where it meets the lower bearing member. The invention also provides an improved feed nozzle for use of the pulverizer in drying applications.

Abstract: In a method for disposing of waste matter such as waste tire pieces by using first and second shredding members each having shredding blades, the waste matter is introduced into a space between the shredding blades of the first and second shredding members and shredded or torn off into fine chips by operating the first and second shredding members, while partially caught by grooves formed in opposite faces of the shredding blades of the respective shredding members. By moving the first and second shredding members relative to each other in opposite directions to impart a shearing force to the waste matter in the space between the shredding blades, the waste matter is effectively torn off into pieces. When a waste tire is processed in an apparatus for practicing the method, it is successfully separated into rubber parts and wires with high efficiency.

Abstract: The invention relates to a classifying mill with a housing configured for containing a stream of particulate material. A particulate material feed inlet is associated with the housing for introducing the particulate material into the housing. A milling assembly is disposed within the housing and configured for grinding the particulate material into fines and oversize particles. A classifier comprising a classifier rotor is disposed within the housing and below the milling assembly. A fines output at the underside of the classifier is configured for extracting the fines from the classifier, and an oversize particle collector at the underside of the classifier is configured for extracting the oversize particles from the housing. The classifying mill is arranged such that the particulate material stream extends downward from the feed inlet, through the milling assembly, and subsequently through the classifier.

Abstract: A cutting mill has a cutting rotor and a rotatable sizing means, arranged together with the cutting rotor in a common housing.

Abstract: In order to further develop a circuit grinding apparatus with roller mill or roller press for comminution of the material bed of granular material and with at least one integrated sifter, in which mill and sifters are arranged within two fixed side face walls with an interlying turnably borne material conveyor ring settable into rotation for an internal material circuit, so that seals between the fixed side face walls and the interlying material conveyor ring that is settable in rotation are no longer necessary, it is proposed according to the invention to combine the two fixed side face walls over a housing part that houses the rotatable material conveyor ring, especially a ring housing part, into a housing tightly enclosing the entire working space of the circuit grinding apparatus, and to arrange on the underside of the housing part at least one grinding material leakage discharge from the working space of the circuit grinding apparatus.

Abstract: In order to further develop a circuit grinding apparatus with a roller mill or roller press for material bed disintegration of granular material and with at least one integrated sifter, where the mill and the sifter are disposed within two stationary side walls between which a material conveyor ring is rotatably seated and can be set into rotation for an internal circulation of material in such a way that the rotatably seated material conveyor ring, which has a very large diameter and rotates in operation, is as light as possible and the rotary actuator is configured as simply as possible, it is proposed in accordance with the invention to dispose around the bottom circumferential area of the material conveyor ring more than two, for example four rolls supporting the ring on the bottom, where two adjacent bearing rolls in circumferential direction of the ring are positioned at the ends of at least one common rocker lever which, in turn, is supported on the machine frame via a tilting joint.

Abstract: A process and device for fluidized-bed jet milling, in which solid particles to be milled, which are suspended in a flowing fluid, are disintegrated into particles of a smaller size by using at least one fluid jet induced to enter the fluidized bed with high energy to bring about an exchange of energy between the particles of the fluidized bed. The interaction between particles and the fluid jet entering the fluidized bed with high energy is influenced, especially in the area of entry of the jet, by a centrifugal force, which acts on the particles in the fluidized bed, in the vicinity of the site of entry of the fluid jet.

Abstract: A cost efficient single-drive particulate material pulverizing and classifying mill capable of operating at high efficiencies and able to conveniently produce selectively sized particles from a wide variety of materials during milling operation without restructuring the mill configuration.

Abstract: A comminuting apparatus includes a frame, a set of overlapping scissor rolls, a first drive motor, and a second drive motor. The frame has an enclosure with an entrance opening for receiving waste material. The set of overlapping scissor rolls is carried within the enclosure for rotation, including a first scissor roll and a second scissor roll. The first drive motor is coupled to the first scissor roll, and the second drive motor is coupled to the second scissor roll. The first drive motor is operative to drive the first scissor roll at a substantially variable operating speed. The second drive motor is operative to drive the second scissor roll in co-rotation at a substantially constant operating speed.

Abstract: A method of grinding cement clinkers and a cement clinker grinding apparatus having a vertical roller mill are provided. In the method, feed material is ground by a table and rollers. Next, substantially all the resultant ground material is taken out from an underside of the table and then converted to a separator for classifying the ground material by a bucket elevator. The resultant coarse powder provided by the separator is returned to a center of the table. In grinding, an pressing force of each of the rollers onto the table is selected so that a roller pressure per full sectional area of the roller ranges from 10 to 15 kg/cm2. Further, a circulation quantity of the coarse powder to be returned to the vertical roller mill is selected from 100 to 300% of the feed material charged into the center of the table. And the liquid of 0.

Abstract: Apparatus and method for concentrating metallic aluminum from dross comprising a system in which dross is repeatedly and continuously passed through an impact type mill to mill the material and to enable the metallic aluminum concentrates to be separated from the non-metallic components of the dross. A portion of the milled material is continuously diverted by a percent divider to a screening zone where it is classified according to particle size. Through-put devices regulate the average number of passes that material is circulated through the mill in accordance with particle size to obtain a product of relatively high aluminum concentration and a by-product of a relatively low aluminum content.

Abstract: A system for processing plant material is provided which separates plant fibers from the woody portions of the material to produce a commercially desirable length of fiber and to grind the shorter woody portions that have been separated from the longer fibers to a desirable size which has found use in certain commercial applications. The current system is well suited to process the tough fibers of the North American strain of flax straw, and will also find utility in processing other bast fibers, such as jute, hemp, ramie, and kenaf.

Abstract: A large, mechanically agitated pump box is used between a mixer, for mixing oil sand and water to produce a slurry, and a pipeline for conveying the slurry to a processing facility. Prior to the aqueous slurry being discharged into the pump box from the mixer, it is screened to reject large solids. The oversize is directed to an impactor where it is comminuted and the comminuted product is screened again prior to being discharged into the pump box. The pump box is designed to increase the residence time of the slurry in the pump box and to separate the slurry into two phases, the suspended slurry and the larger lumps that cannot be suspended. The larger lumps that settle in the pump box are recycled to the impactor for comminution.

Abstract: A continuously operating process and a plant for comminuting by grinding a mineral material into grains of different sizes and dividing the ground product into several fractions each constituted by grains the dimensions of which are between a predetermined upper limit and a predetermined lower limit. Starting from a raw product, it is subjected to grinding by material layer crushing, the ground products are divided into several fractions comprising at least one coarse fraction and one fine fraction, and those grains the dimensions of which are greater than the upper limit of the coarse fraction, and possibly all or part of the fractions the grains of which have dimensions between the lower limit of the coarse fraction and the upper limit of the fine fraction, are returned to the grinder input.

Abstract: A compact circuit grinding apparatus wherein two press rolls are housed in one housing, comprising of two stationary lateral end walls, between which is arranged a material conveyor ring, which is rotatably seated and can be set into rotation, for an internal material circulation. The inflow of material takes place through one or more openings in one or both housing end walls and the outflow of material likewise takes place laterally through one or more openings in the housing end wall. A sifter is arranged underneath the nip of the two rolls in the housing. The sifter can comprise a static or dynamic sifter and a flow of air through the sifter removes the fines from the crushed granular material.

Abstract: The grinding efficiency can be improved by use of a vertical roller mill, while reducing the energy consumption and improving the product quality. The disclosed cement clinker grinding apparatus comprises a closed circuit for conveying the ground material from the vertical roller mill (21) to the external separator (28) by the bucket elevator (29), for classifying the conveyed material into coarse powder and fine powder, and further for returning the classified coarse powder into the vertical roller mill (21). That is, a part of the ground material conveyed by the bucket elevator (29) is divided by the distributing damper (32) and then directly returned to the vertical roller mill (21). Since the ground material are not conveyed by air flow conveyance (i.e., air sweep), it is possible to prevent an increase of power consumption of the suction fan (31).

Abstract: A product bed comminution high-pressure roller press wherein the problem of great recirculations of product material or, respectively, high product circulation rates caused, for example, because of reduced roller press pressures is solved employing little machine outlay. Two rollers (10, 11) are surrounded by a housing composed of two stationary lateral end walls (12, 13) between which a rotatably seated material conveying ring (16) that can be rotated is arranged for an internal product material circulation. The product material is admitted from the side through one or more openings (22) in one or in both housing end walls (12, 13) and the product material is discharged laterally through one or more openings (24) in the housing end walls (12, 13) via a discharge element (25) and/or via one or more discharge elbows (27).

Abstract: In this method of comminution according to the invention, pre-comminuted ore material is subjected to material bed comminution in a material bed roll mill. In order to achieve optimal comminution even of very different ore materials with a high throughput the ore material is pre-comminuted in an autogenous mill, whereupon at least fractions of fine material are separated out of the pre-comminuted material before the rest of the material is further comminuted in the material bed comminution.

Abstract: An apparatus for comminuting solid waste material comprises a frame having an enclosure with an entrance for initially receiving solid waste material; a set of overlapping scissor rolls rotatably mounted within the enclosure for shearing the waste material into subdivided pieces when the material passes between the scissor rolls; a feed roll rotatably carried by the frame for directing the waste material to the scissor rolls; and a separator screen carried by the frame in association with the at least one of the scissor rolls and having a plurality of apertures of a predetermined size for separating pieces having a size less than the predetermined size to pass therethrough to a shear outtake manifold for separation while preventing large subdivided pieces having a size greater than the predetermined size from passing therethrough.

Abstract: An improved coal pulverizer classifying system including a classifier cone extension to protect coal flow into the pulverizer from the annular fine-lifting airflow from the pulverizer throat. The classifier cone extension replaces traditional intermittent discharge structure, improving flow through the classifier system and reducing the disruptive effects of the discharge on the annular flow from the pulverizer throat. The pulverizer feedpipe outlet is located in the classifier cone extension, but above the throat of the extension to prevent interference between the feedpipe and the flow of coal through the extension. In a preferred form an adjustable clearance cone is mounted for vertical adjustment on the lower end of the feedpipe.

Abstract: An apparatus and method for defibering paper and dry pulp in a substantially dry processing environment is disclosed. The apparatus and method for defibering paper and dry pulp uses a dry processing cell into which cellulose material is supplied. The dry processing cell includes a rotating element for creating a turbulent air flow within the cell. The turbulent air flow causes the cellulose material to be circulated within the dry processing cell and to collide with the rotating element, cell walls, and the cellulose matter, itself. This circulation causes disassociation of the cellulose material from the filler, inks and other materials into single cellulose fibers that are capable of being removed from the cell for further processing.

Abstract: An improved apparatus for comminuting solid waste material into small pieces having a size less than a predetermined size is disclosed. A set of overlapping scissor rolls are rotatably mounted within an enclosure for shearing the waste material into subdivided pieces when the material passes between the scissor rolls. An entrance for receiving the material has: (1) a shear intake manifold communicating with the entrance for receiving the solid waste material upstream of the scissor rolls and directing the waste material to the scissor rolls, and (2) a shear outtake manifold downstream of the scissor rolls for receiving the subdivided waste material pieces from the scissor rolls after the material has passed between the scissor rolls. A feed roll is carried by the frame for feeding the waste material into the shear intake manifold at a desired line speed and directing the waste material to the scissor rolls. A separator screen separates large and small subdivided pieces.

Abstract: A solid waste comminuting apparatus (10) for reducing solid waste material (12). The apparatus (10) has rolls (42, 44) for severing material that is fed into the entrance (32). After the material is severed, it is carried by an airstream to a fan (112). The subdivided pieces are directed to a separator screen (131) mounted within the centrifugal housing. The airstream carries the small pieces (14e) through the separator screen (131) into an outer volute chamber (135) for discharge from the apparatus. The large pieces (14a-14d) which do not pass through the separator screen (131) are recycled through a recycle outlet (143) and a recycle conduit (150) back to the rolls (42, 44) for further size reduction.

Abstract: A toner producing system which can efficiently produce toner having a sharp particle size distribution by suppressing the occurrence of microscopic powders and improve energy efficiency in pulverization. The system is furnished with a second pulverizing apparatus having a second colliding plate inclined at an angle in a range between 45.degree. and 90.degree. inclusive with respect to a direction in which a raw material subject to pulverization is introduced into a second pulverizing chamber through a second nozzle, and a third pulverizing apparatus having a third colliding plate with a conical member being placed thereon, so that the raw material introduced into a third pulverizing chamber through a third nozzle collides with an inner surface thereof following the collision with the third colliding plate.

Abstract: An apparatus and method for recycling glass waste comprising glass and non-glass materials. The apparatus has a device for receiving and presizing the glass waste to produce presized glass waste. A first conveyor receives the presized glass waste and transfers it to a storage hopper. The presized glass waste is then transported to an impact mill via a second conveyor. The rate of movement of the second conveyor is regulated by a control device located within the impact mill. In the impact mill, the glass component of the glass waste is beat off the non-glass component of the glass waste to produce a pulverized mixture. The pulverized mixture is then sent to a screening device via a third conveyor. In the screening device, the glass and non-glass material are separated from the pulverized mixture and collected for reuse.

Abstract: Method for separating paper fibers and contaminants for mixtures containing water, fibers, contaminants, paper or cardboard pellets, wherein the mixture is subjected firstly to a screening, secondly to a mashing and then thirdly to a further screening with addition of water, subsequent to which the pulp retained by the screen is evacuated.

Abstract: The invention relates to a method as well as to apparatus for combined grinding of at least two materials of differing grindability, such as clinker and limestone, wherein the material which is more difficult to grind is pre-crushed to a Blaine fineness of grinding of at least 700 cm.sup.2 /g and there-after is further ground together with the other material to produce the finished material.

Abstract: In a method of grinding a printed circuit board, a printed circuit board having various parts mounted thereon, or a residual ground product produced in the manufacturing process for the boards, and recovering valuable substances by separating the ground product into a portion containing a large amount of metal component such as copper and a portion consisting a resin, a filler material, and the like through a separation step, the separation step includes a specific gravity separation step of separating the ground product into a portion containing a large amount of substance having a high specific gravity and a portion containing a large amount of substance having a low specific gravity, and an electrostatic separation step of separating the ground product into a portion having a large amount of conductor and a portion containing large amount of insulator. The grinding step includes a coarse grinding step and a fine grinding step.

Abstract: The invention relates to the comminution of moist mineral material in the comminution zone of a material comminuting machine followed by breaking up of agglomerates which have formed and subsequent wet classification of the broken-up material. A good disagglomerating effect and reliable operation is achieved with relatively compact construction of the apparatus if the comminuted product is subjected to at least an injection of fluid with at least partial disagglomerating effect whilst still within the material bed comminuting machine and immediately after leaving the comminution zone, and afterwards is passed on to the wet classification.

Abstract: When pulverising polyurethane, polyurea and/or polyurethane/polyurea materials in a roller mill with at least two rollers (2,3) rotating at different circumferential speeds, a very economical method of operation is achieved by returning the coarse fraction falling freely out of the roll slit (4) to the roll slit (4) and stripping the fine material adhering to the roller (3) with the higher circumferential speed and discharging it separately from the coarse fraction.

Abstract: The invention relates to a stirring mill in whose grinding tank, provided with an inlet and an outlet, and charged with a load of grinding beads, a stirring shaft (stirring mechanism) provided with stirrers, is rotatable, on which, for holding back the grinding beads a separator is mounted ahead of the outlet and is provided with radial openings. The invention is addressed to the problem of creating a stirring mill with a grinding bead separator whose separation limit corresponds to the upper grain size of the fines, by which sieves or filters for holding back the grinding beads are avoided, and which nevertheless sufficiently assures that no grinding beads or particles of dispersants can enter into the finish-ground product. This problem is solved by the fact that the separator is formed by a rotor in the manner of a centrifugal force sifting rotor (6) wherein the passages are formed by the interstices or spaces between every two sifter rotor paddles (10).

Abstract: An agitator mill is provided with a separate grinding-stock/auxiliary-grinding-body separator device, which comprises a rotor, drivable to rotate, for the separation of the auxiliary grinding bodies from the treated grinding stock. The auxiliary grinding bodies and untreated grinding stock are returned to the agitator mill. The separator device and the agitor mill and the lines connecting these two form a closed system.

Abstract: The invention relates to a mill classifier or sifter, particularly a roller mill classifier, which is suitable as a high-performance classifier for a roller pan mill or a roller mill, e.g. for an air-swept mill. In order to achieve in the case of a particularly simple construction a high flexibility and optimization of the classifying processes as a function of the particular needs, there is a combination of a static distributor formed from several adjustable guide blade rings and a ledge rotor as the dynamic classifier. In order to achieve a multiple classifying and in particular a reduction of the coarse material fraction prior to dynamic classifying, in the vicinity of the static distributor is provided a deflecting device in an area of the classifier cover, through which the disadvantageous effects of a 90.degree. deflection are largely avoided.

Abstract: A high-speed fine pulverizer wherein a fixed top grindstone is mounted in a pulverizing chamber with a reduced pressure-tolerable mechanism, a rotating bottom grindstone is arranged in opposition thereto and mounted firmly to a rotating disk with a plurality of ejection wings for reduced pressure and disposed around the rotating grindstone, and an intensive reduced-pressure jet stream is caused by the high-speed revolution of rotating bottom grindstone to such air from a central opening of fixed grindstone, thereby forcedly passing the pulverizing raw material fed from said opening through the clearance between both grindstones at high speed while whirling it so as to be finely pulverized, wherein the pulverizing raw material can be pulverized finely at ambient temperature without a rise in temperature, allowing the conversion of foods etc. to powder without thermal transmutation.

Abstract: The invention relates to a method and to an apparatus for crushing and fine grinding of solid particulate materials, e.g. clinkers used in cement, utilizing a conventional ball mill. More particularly, the invention involves use of such a ball mill in the primary crushing of the material (which use is advantageously limited to the preliminary crushing operation requiring minimum energy consumption), and of a jet mill in the final crushing (conventionally done in a ball mill also). The jet mill is incorporated in a secondary independent grinding circuit which grinds the material to the required fineness value.

Abstract: A pulverizer is provided with: a ring-form rotary hammer supported by a rotary shaft and having a pulverizing blade including a plurality of concaves and convexes on its outer surface; a liner fixed so that a gap is left between the rotary hammer and the liner and having a plurality of concaves and convexes on its surface which faces the hammer; and a rotary classifying fan for discharging toward an exit a material pulverized between the rotary hammer and the liner into a predetermined particle diameter or smaller and directed to an upper part. The pulverizing blade is provided substantially on an entire periphery, and a circulation passage for directing downward a material not discharged toward the exit is provided below the pulverizing blade.

Abstract: An apparatus for dehulling grass seed utilizing a vibrated housing having an elongated chamber. The interior of the chamber is accessible through openings or ports that provide a plurality of entries and exits for the processing of grass seed. Grass seed is dehulled by a housing mounted pneumatic accelerator that removes the hulls from the seeds. Hulls and seeds are then directed into the interior of the chamber wherein separation of seeds from hulls and hulls containing seeds occurs. Seeds are discharged from the chamber and the hulls containing seeds are returned to the pneumatic accelerator for repeating the dehulling process.

Abstract: An air-swept mill has an annular space with a blade ring between a rotary grinding pan and a casing wall for fluid delivery flow. The annular space and the blade ring form a gas directing or guiding device for rotary flow and circulation flow of the fluid delivery flow. Above the grinding pan, in the vicinity of a classifier, the casing wall is provided with at least one removal device for removing a part of an outer oversize flow, which is formed as a vented concentrated flow substantially directly at the casing wall.