Abstract: The present disclosure relates to the treatment of streams derived from construction and/or demolition (C&D) debris, such as C&D fines streams, asphalt shingles, drywall, or wood. The process can include a kinetic pulverization stage through a kinetic pulverizer where the frangible materials are size-reduced and the ductile materials are liberated and remain as an oversized fraction. The feedstock can include infrangible materials that also remains as an oversized fraction. The pulverized material is then subjected to a separation stage, which may include mechanical and/or magnetic screening, to separate the oversized material comprising the ductile material, and optionally larger particles of the infrangible material, from the size-reduced material comprising the frangible material, and optionally small particles of infrangible material.

Abstract: A process for comminuting particles of heterogeneous material. The particles of heterogeneous material are fragmented and broken into smaller particle size by breaking them against each other. Heterogeneous material means two or more different solid materials or phases in the same solid. The component materials may have different specific gravity and/or hardness. In the process, a slurry of particles of heterogeneous material is pumped through an agitated mixture of impingement media, wherein the impingement media has a size greater than a size of the particles, wherein adjacent impingement media interact to create impingement zones through which the particles pass and impinge each other to cause the particles to fracture and break into smaller particles. The impingement media may be from 5 to 10 times larger than the particles. The impingement media may be harder than the particles. The heterogeneous material may be coal.

Abstract: This system is for implementing a method for feeding of a granulated substance, and is provided with: a feeding path through which cut tobacco is fed toward a tobacco band in a cigarette manufacturing machine; a separation device for separating, by winnowing, the cut tobacco into good products and sub-standard products that are heavier than the good products, in the process of feeding the cut tobacco; an adjustment device that is capable of directly and/or indirectly adjusting the velocity of a current of air used for separation through winnowing; a transfer path which receives and transfers the sub-standard products discharged from the separation device; a weighing device which takes a sample of the sub-standard products being transferred on the transfer path and measures the weight of the sampled sub-standard products and outputs the weighing result; and a controller which, on the basis of the weighing result, controls the operation of the adjustment device so as to bring the sampling weight equal to a targ

Abstract: A comminution system for heterogeneous materials includes pumps, a source of liquid in fluid communication with the pumps, a source of heterogeneous material, a mixer to combine the heterogeneous material and the liquid, and nozzles in fluid communication with the pumps, respectively. The pumps are in straight-line alignment with the nozzles. The nozzles receiving the heterogeneous material combined with the liquid direct the combined slurry to an impact zone where the fractions of the heterogeneous material are disassociated.

Abstract: Provided is a vertical roller mill equipped with a rotary classifier for causing a plurality of classification blades provided above a rotary table and positioned around an axis to rotate about the axis, wherein: of a solid fuel pulverized by a roller, the rotary classifier guides solid fuel fine powder from an outer-circumferential-side space to an inner-circumferential-side space surrounded by the plurality of classification blades, and suppresses, by collision with the plurality of classification blades, an intrusion of solid fuel coarse powder into the inner-circumferential-side space; and each of the plurality of classification blades is shaped in a manner such that there is no interference between a scattering direction in which the coarse powder that collided with the classification blades scatters and an intake direction in which the fine powder is guided to the inner-circumferential-side space, and the scattering direction is oriented upward relative to a horizontal direction.

Abstract: A system for adjusting a depth of a material bed in a pulverizer mill is provided. The system includes a rotatable bowl, an extension ring, and an extension mechanism. The rotatable bowl has a surface operative to support the material bed while the bowl rotates such that particles of the material bed are pulverized against the surface by one or more grinding rollers of the pulverizer mill. The extension ring is disposed about a circumference of the rotatable bowl extending away from the surface and defines a depth of the material bed. The extension mechanism adjusts at least one of the extension ring and the rotatable bowl while the rotatable bowl rotates. Adjusting at least one of the extension ring and the rotatable bowl via the extension mechanism moves the extension ring in relation to the surface so as to adjust the depth of the material bed.

Abstract: Provided is a solid fuel pulverizing device (100) provided with: a ventilation unit (30) configured to ventilate an interior of a housing (11) with primary air for supplying a solid fuel pulverized by a roller (13) to a classifier (16); a pressure detector (50) configured to detect an internal pressure of the housing (11) relative to a reference pressure; a flow rate detector (60) configured to detect a flow rate of the primary air blown into the interior of the housing (11) by the ventilation unit (30); and a controller (40) configured to perform control and transition the solid fuel pulverizing device (100) to a stopped state upon the internal pressure detected by the pressure detector (50) being a predetermined pressure or higher and the flow rate of the primary air detected by the flow rate detector (60) being a predetermined flow rate or less.

Abstract: The invention relates to a pulveriser mill which includes a rotary grinding member and a port ring (10) which is arranged around a periphery of the rotary grinding member for rotation with the rotary grinding member about an axis. The port ring (10) includes a plurality of vanes (22) which are angularly spaced about the axis in a configuration which allows air to flow from below the port ring (10) to above the port ring (10). The vanes (22) are inclined with respect to the vertical and have an operatively upstream end and a downstream end and a non-planar, arcuately curved leading surface (24) which extends between the upstream end and the downstream end. The vanes (22) furthermore have a non-uniform radial width in the axial direction.

Abstract: The invention relates to a method and an apparatus for comminuting grinding stock with a roller mill, wherein a grinding plate cooperates with at least two grinding rollers and the grinding stock supplied in the mass flow is comminuted between grinding plate and grinding roller. At least two grinding rollers are driven via dedicated drives, wherein a power compensation control is carried out for the drives of the grinding rollers, such that the power of the drives is controlled in a predefined ratio to one another. The power control is then effected by changing the mass flow of the grinding stock supplied to at least one of the grinding rollers.

Abstract: A heavy duty drive arrangement (1, 1?) having a first spur gear including a first gear wheel (4; 4?, 4?) meshing with a pinion (3) of a motor (2) and a second spur gear comprising a gear wheel (8; 8?, 8?). A drive pinion (9; 9?, 9?) configured to mesh with a ring gear (10) of the working equipment is coupled to the gear wheel (8; 8?, 8?) of the second spur gear and has an axis of rotation (E) which is essentially parallel to the rotor axis (A). The first spur gear and the second spur gear are coupled by means of a dynamic coupling (5; 5?, 5?), preferably an elastic or a hydrodynamic coupling. A mill (20) may include the heavy duty drive arrangement (1, 1?).

Abstract: In the method according to the invention for the comminution of grinding stock in a vertical roller mill, the grinding stock is fed upstream of at least one grinding roller in order to form a grinding bed and is comminuted between a grinding table and the at least one grinding roller, the grinding bed which is being formed being settable at a differing height over the width of the grinding roller by means of a feeding device.

Abstract: A vertical roller mill has grinding rollers which roll over a grinding path of a rotatable grinding table, and a surrounding nozzle ring separation area for conveying and separating gas. A coarse fraction of ground material is entrained in gas upwards in ducts from a location that is below, at, or above the nozzle ring separation area and is transported into an entry to a material separator located above the grinding table.

Abstract: The roller mill according to the invention is composed essentially of at least two grinding rollers which interact with a grinding plate for comminuting material to be ground, wherein the at least two grinding rollers or the grinding plate and at least one grinding roller are each assigned a separate drive train for driving same, wherein each drive train has a main motor and a main gear mechanism. At least one drive train additionally comprises a superimposition gear mechanism with a regulating drive, wherein an open-loop and closed-loop control device which is connected to the at least one regulating drive is provided, said open-loop and closed-loop control device regulating the power of the separate drive trains with respect to one another by means of the at least one regulating drive.

Abstract: Provided is a vertical pulverizing apparatus capable of suppressing abrasion of throat vanes (40) and elongating their abrasion resistant lives to thereby increase working efficiency. The vertical pulverizing apparatus is characterized in that: a throat (4) is provided between a housing (32) and a pulverizing table (2) and has an annular flow channel which is surrounded by a throat inner peripheral wall (41) and a throat outer peripheral wall (42) and which is partitioned by a large number of throat vanes (40); and a slope part (43a, 43b) extending diagonally downward from an inner peripheral wall surface of the housing (32) toward a top end of the throat outer peripheral wall (42) and a horizontal part (44) extending from a bottom end of the slope part (43b) continuously to the top end of the throat outer peripheral wall (42) are provided so that top end surfaces (40a) of the throat vanes (40) and a top surface of the horizontal part (44) can be set at the same height.

Abstract: A system for suppressing and inhibiting fires in coal pulverizer mills can include a fire suppression solution storage tank, a flow control cabinet, an equipment control/pumping enclosure, an air distribution system, and injection piping and nozzles installed at various positions in one or more pulverizer mills. A first set of nozzle assemblies in communication with the fire suppression solution can be positioned in the mill to disperse the suppression solution within the classifier zone of the mill. A second set of nozzle assemblies in communication with the suppression solution can be positioned within the mill to disperse the suppression solution within the grinding zone. A third set of nozzle assemblies can be positioned within the primary air duct of the mill.

Abstract: An air flow control arrangement for a pulverizer includes an inner ring segment, an outer ring segment, a plurality of vanes, and a plurality of vanes. The inner and outer ring segments are adaptably configured in a spaced relation to each other. Further, the plurality of vanes is spaced apartly arranged between the inner and outer ring segments to form flow ducts. Furthermore, each wingtip of the plurality of wingtip is detachably attached to a respective vane of the plurality of vanes to be adaptably replaceable or changeable.

Abstract: A coal pulverizer including a mill housing, a grinding surface disposed in said mill housing, a grinding wheel engaging said grinding surface for pulverizing coal chunks; an annular throat disposed around said grinding surface channeling a primary airflow from a lower housing portion below said grinding surface upward through an upper housing portion above said grinding surface; an annular secondary airflow chamber extending around an exterior of said upper housing portion channeling a secondary airflow circumferentially into said upper housing portion above said grinding surface; and, an annular secondary airflow deflector extending along an interior of said upper housing portion above said grinding surface directing said secondary airflow from said secondary airflow chamber downward across said grinding surface in a generally uniform uninterrupted circumferential airflow pattern.

Abstract: Methods and arrangements for determining the fineness of a ground material in a mill are provided, wherein the acoustic spectrum of the mill during the grinding process is used for concluding the fineness. The mill comprises a drum in which the ground material is present during the grinding process, said drum being driven by a magnetic drive having at least one magnetic segment during the grinding process, so that a rotating magnetic field generated with the aid of the magnetic drive causes the drum to rotate. In order to determine the acoustic spectrum, a voltage induced in a coil of the magnetic segment is determined at least intermittently. On the basis of a model, using the detected time-dependent induced voltage, conclusions can be drawn about the acoustic spectrum and therefrom about the fineness.

Abstract: A roller mill includes a grinding table, at least one grinding roller in rolling engagement with the grinding table, a main drive system for driving the grinding roller and/or the grinding table, and an auxiliary drive for driving the grinding table. The auxiliary drive includes at least two linear drives for rotating the grinding table and a control device for individually controlling the linear drives in order to provide an uninterrupted rotational movement.

Abstract: The invention relates to a roller mill, in particular a coal mill, with a feed system, having an integrated screw feeder. The screw feeder is arranged virtually horizontally in the region of a grit cone and comprises a screw shaft guided through the roller mill and the longitudinal axis thereof, which screw shaft is arranged on both sides respectively outside of the roller mill and at one end with a drive means and at the other end in a bearing outside of the roller mill. The feed material is fed with the screw conveyer outside of the roller mill and forcibly conveyed therein to a tray side rejection opening above a cone opening of the grit cone and drops together with the coarse grain rejected in the classifier centrally onto the grinding pan. An even distribution of the feed material and improved smooth running of the roller mill and energy saving are achieved and also soiling of the screw shaft is avoided.

Abstract: A solid particle flow distribution controller includes an extension skirt configured to be mounted to a discharge skirt at a division between an upstream solid particle conveyance pipe and a plurality of downstream pipes. The extension skirt includes a plurality of circumferential segments. Each segment is movably mounted to the discharge skirt for movement in an upstream and downstream direction with respect to the discharge skirt. The segments of the extension skirt are configured and adapted for motion in the upstream and downstream direction independent of one another to extend upstream of the discharge skirt as needed to improve solid particle distribution among the downstream pipes.

Abstract: A biomass pulverizing apparatus includes a pulverizing apparatus body including a feedstock supply pipe, the pulverizing apparatus body for supplying biomass feedstock from above in a vertical axial direction, a pulverizing table for placing the biomass feedstock, a drive section for rotationally driving the pulverizing table, a pulverizing roller for pulverizing the biomass feedstock by a pressing force, the pulverizing roller being operated in conjunction with the rotation of the pulverizing table, a blower unit for forming an upward flow upward from below on the outer peripheral side of the pulverizing table so as to jet conveying gas for conveying the pulverized biomass powder in an air stream, a classifier, the classifier for classifying the biomass powder accompanied with the conveying gas, and a blowing gas introduction section.

Abstract: A classifier [100] is disclosed that employs adjustable vanes [140] that may be interactively adjusted to change the distribution of fuel particle sizes that are passed on to a furnace. The classifier employs a frame [133] having a plurality of windows [131] each having an adjustable vane [140]. A control ring [160] is rotated with respect to the frame [133] to simultaneously move links [150] connected between the control ring [160] and the vanes [140]. This causes the vanes [140] to open or close, changing the air flow path and changing the size distribution of particles passing through the classifier [100] to the furnace. The system may include an adjustment system [260] that can automatically sense particle size to optimize several physical parameters related to particle size.

Abstract: A roller mill includes a rotatable grinding table, at least one grinding roller that is retained rotatably on a pivot lever and is in rolling engagement with the grinding table, with the pivot lever being arranged for pivoting about a pivot lever axis, and a drive train associated with the grinding roller in order to drive the grinding roller with a fixed motor.

Abstract: A roller mill for grinding particulate material such as for example cement raw materials, cement clinker and similar materials, said roller mill comprising a mill housing enclosing a grinding table and a set of rollers rotatable about a vertical shaft. The set of rollers are configured for interactive operation with the grinding table and comprising a number of rollers each rotating about a roller shaft which is connected to the vertical shaft via a hinged connection with a center of rotation which allows a free circular movement of the roller in upward and downward direction in a plane comprising the centerline of the roller shaft. The center of rotation of the hinged connection in a vertical plane is located under the centerline of the roller shaft.

Abstract: The invention relates to a roller mill having a grinding table, at least one grinding roller and at least two drives with a rotor winding for driving the roller mill and at least one adjustment device for adjusting the motor torque of at least one drive, the adjustment device being connected to the rotor winding of at least one drive in order to influence the rotor current.

Abstract: The present invention includes: a mill main body with a material feed pipe for feeding a biomass material from above in a vertical axis direction; a mill table on which the fed biomass material is placed; a drive unit rotating and driving the mill table; a mill roller that operates in conjunction with rotation of the mill table to mill the biomass material by a pressing force; and a ventilation means that forms an upward flow to blow out a carrier gas to convey milled biomass powder, wherein the mill main body has a barrel part decreased in diameter in the middle thereof in the vertical axis direction, and the mill main body has on a top plate thereof a plurality of discharge tubes circumferentially arranged for discharging the biomass powder on a line extended from the diameter-decreased barrel part in the vertical axis direction.

Abstract: A roller mill structure which achieves uniform distribution of fine particles passed through a rotary classifier to fine particle exits disposed at four points when conveying as pulverized coal milled in the roller mill on the air current is provided. A roller mill structure is configured to discharge pulverized coal obtained by milling a raw coal, which is loaded in a mill body (11), from fine particle exits (14) formed on the top of the mill body so as to be quartered in the circumferential direction to the outside by air current conveyance.

Abstract: The roller mill according to the invention substantially comprises at least one grinding roller and a grinding table, the grinding table having a grinding table inner space which is open in a downward direction, at least one grinding roller drive system for driving the grinding roller and a grinding table drive system for driving the grinding table. The grinding table drive system further has a gearless direct drive which is arranged in the grinding table inner space.

Abstract: In a vertical roller mill in which a fixed-type cyclone sorter is provided in a casing, the fixed-type cyclone sorter includes a conical member; a fixed-blade entrance window through which a solid-gas two-phase flow is introduced into the interior of the conical member; a flat plate-like fixed blade that causes the solid-gas two-phase flow to spiral; an inner cylinder into which pulverized coal is guided from the bottom end thereof toward the top end thereof by means of spiraling of the solid-gas two-phase flow; and a pulverized-coal exit through which the pulverized coal guided to the top end of the inner cylinder is guided outside the conical member, wherein the fixed blade is provided with a tip portion where a downward flow is increased for the solid-gas two-phase flow guided into the interior of the conical member from the fixed-blade entrance window.

Abstract: A roller mill includes a grinding table arranged for rotation about a mill axis, at least one grinding roller rotated about a grinding roller axis and in rolling engagement with the grinding table, and at least one pivot lever retaining the grinding roller and having a pivot axis orientated parallel with or inclined relative to the grinding roller axis. A fixed motor is connected to the grinding roller via a drive train to transmit drive power, the drive train including a fixed drive train and a movable drive train. The fixed drive train has a drive element in contact with the movable drive train and arranged coaxially relative to the pivot axis of the pivot lever. The two drive trains may be connected to each other via two bevel wheels arranged so that the axes of the bevel wheels intersect in the pivot axis.

Abstract: In a vertical mill, a pulverization table is supported with a vertical rotation axis core in a housing so as to be capable of being driven and rotated, and a pulverization roller rotatable in conjunction with rotation of the pulverization table is disposed above the pulverization table so as to be opposed to the pulverization table, and a cutter roller rotatable in conjunction with rotation of the pulverization table is disposed above the pulverization table so as to be opposed to the pulverization table. Accordingly, a solid matter such as biomass can be efficiently pulverized, thereby achieving improvement in pulverization efficiency.

Abstract: The invention relates to a roller mill having a grinding pan which is rotatable about a mill axis, on the grinding track of which grinding pan stationarily disposed grinding rollers roll and thereby define with their circumferential surfaces on the grinding track a running circle with an inner diameter and an outer diameter, and having a grinding material distributor for grinding material to be reduced, which is arranged as an elevation in the centre of the grinding pan coaxially with respect to the mill axis and rotates with the grinding pan.

Abstract: A roller mill for grinding particulate material such as cement raw materials, cement clinker and similar materials includes a mill housing, a substantially horizontal and stationary grinding table, and a number of rollers each rotating about a roller shaft which is connected to a rotatable vertical shaft centrally positioned relative to the stationary grinding table. The rollers are configured for interactive operation with the grinding table. The grinding table is stationary. The roller mill also includes at least one first device utilized for introducing gases into the mill housing and at least one second device for continuously diverting ground material suspended in gases out of the mill housing. As a consequence hereof, the process for the roller mill with a stationary grinding table will be continuous and the diameter of the grinding table will not be subject to limitations.

Abstract: A roller mill for grinding particulate material such as cement raw materials, cement clinker and similar materials comprises a mill housing surrounding a substantially horizontal grinding table, a number of rollers each rotating about a roller shaft and configured for interactive operation with the grinding table and at least one mechanism or device for introducing gases into the mill housing. The at least one mechanism or device for introducing gases into the mill housing comprises an annular duct having openings in a wall facing the grinding table and being located around the outer circumference of the grinding table. As a consequence hereof, a significant reduction of the pressure loss in a roller mill and thus a significant reduction of energy consumption will be ensured.

Abstract: A mill having a grinding member carrying one or more fixed openings (37) at its periphery, wherein in the vicinity of the fixed opening(s) there is provided one or more variable openings (36), the fixed and variable openings permitting air to flow from beneath the grinding member to above the grinding member. This arrangement allows for good air flow control; air speed may be kept desirably low even when the mill must be run at a high mass flow rate.

Abstract: An annular impactor structure for use in crusher/classifiers of the updraft type. An annular structure comprising a plurality of radially inwardly projecting, essentially vertical impactor plates of high-hardness material is located immediately above a vane structure such that entrained particulate matter from a milling bowl impacts one or both of the impactor plate surfaces. The impactor plates as well as the backer structures between the impactor plates are covered with coin-shaped protrusions. The impactor plate structure can be used in combination with a single or double course vane structure.

Abstract: A double course vane assembly for use in connection with the milling bowl of a pulverizer/classifier. The two courses are either attached to the outer peripheral edge of the milling bowl so as to rotate with the bowl or are attached to the pulverizer/classifier wall so as to remain stationary. In both embodiments, the vane courses are concentric with one another. The vanes in the first course are angled in one sense and the vanes of the second course are angled in the opposite sense.

Abstract: An improved deflector structure for an updraft classifier mill for coal and ore is described. The improved deflector structure has an impingement surface which is characterized by a pattern of surface irregularities, either raised geometric figures or recesses of varying sizes and shapes to create turbulence in the air emerging from a rotating vane structure and impinging the deflector as it travels upwardly through the mill housing.

Abstract: A pulveriser mill having a rotatable grinding ring and a rotatable port ring around the circumference of the grinding ring co-rotatable therewith, the port ring defining around its 360 degree extent a plurality of openings separated by lands, the openings permitting air to flow from beneath the grinding ring to above the grinding ring, and the lands serving as obstructions to the flow of air from beneath the grinding ring to above the grinding ring, wherein the aspect ratio of the openings is in the range from 1:1 to 3:1.

Abstract: The invention relates to a roll mill having a grinding plate rotatable about an axis of rotation, at least one grinding roller in rolling engagement with the grinding plate, and a main drive for driving the grinding plate. An auxiliary drive for driving the grinding plate, and a regulating device are also provided, the regulating device including at least one damping regulator which regulates the auxiliary drive in dependence on torque variations of the main drive and/or variations in the speed of rotation of the grinding plate.

Abstract: The present invention relates generally to the field of coal flow in the outlet portion of a coal pulverizer, and in particular to a new and useful system/apparatus, method and drive means for controlling the position of one or more coal flow vanes in the upper portion of a coal pulverizer. The system and/or apparatus in accordance with the present invention utilizes a “cartridge” which is insertable into a turret at the top portion of a coal pulverizer, the present invention permitting the control of one or more coal flow vanes via an internal control system/means. In certain embodiments, the “cartridge” in accordance with the present invention encircles the raw coal inlet pipe, and is insertable into a turret at the top portion of a coal pulverizer, the present invention again permitting the control of one or more coal flow vanes via an internal control system/means.

Abstract: A roller mill for grinding particulate material such as cement raw materials, cement clinker and the like includes a grinding table and a set of rollers rotatable about a vertical shaft. The set of rollers include a number of rollers rotating about separate roller shafts, which are connected to the vertical shaft. A nozzle ring for directing gases into the roller mill is also included. The nozzle ring encloses the grinding table. Means for regulating the gas flow through the nozzle ring is also provided. At least some of the regulation means are arranged to rotate together with the rollers. Preferably, the position of at least some of the regulation means for regulating gas flow through the nozzle ring relative to the rollers may remain the same so that the gases introduced into the mill via the nozzle ring may exhibit the same flow pattern in relation to the rollers.

Abstract: The invention relates to a method and a device for grinding hot, wet raw material. The invention is particularly suitable for the cement industry and the grinding and simultaneous drying of cement clinker, slag and aggregates. In order to achieve a throughput increase and energy saving, as well as an improvement in the product quality, particularly with mixed cements, there is a simultaneous grinding and drying through a controlled supply of a cooling gas in the upper mill part with a relatively high hot gas inlet temperature in the lower mill part. The cooling gas supplies ensures a predetermined gas-product temperature downstream of the classifier and replaces or significantly reduces the disadvantageous cooling water injection.

Abstract: A method for preparing a carbon siccative for producing electrodes. The dust fraction is produced continuously by a mill/sifter combination with a grain size or specific surface area adjustable during operation, preferably by a roller grinding mill with an integrated sifter.

Abstract: An improved deflector structure for an updraft classifier mill for coal and ore is described. The improved deflector structure has an impingement surface which is characterized by a pattern of surface irregularities, either raised geometric figures or recesses of varying sizes and shapes to create turbulence in the air emerging from a rotating vane structure and impinging the deflector as it travels upwardly through the mill housing.

Abstract: A drying mill for powdered or fine-grained material, in particular also suitable for calcining gypsum, employs a housing, in which a feed device for fuel gas, opening into a lower region, a comminuting device and a material inlet, charging the material onto the comminuting device from above, are provided one above the other, a material outlet leading to the outside from an upper region of a working chamber and a return leading downwards to the comminuting device, the comminuting device being a centrifugal disc which rotates in a horizontal plane and interacts with an impact casing arranged on the inside of the housing. A nozzle ring surrounding the centrifugal disc from below is provided for feeding fuel gas into the working chamber. As a result, the calcining process in particular is assisted in an efficient way by utilizing the thermal energy of the hot gas fed into the working chamber by means of the nozzle ring and the dwell time in the working chamber. A corresponding comminuting method is provided.

Abstract: The invention relates to a safety system ensuring availability of a milling or crushing plant with a roller grinding mill, which is provided in a combined plant, more particularly for the mill drying of cement raw material. For bringing about an almost 100% redundancy, in particular six milling rollers are provided. The roller grinding mill is designed in such a way that 80% of the full milling capacity can be provided in four-roller operation.

Abstract: The invention relates to a roller mill for grinding solid material such as cement raw materials and similar materials, said roller mill comprising a substantially horizontal grinding table and at least two rollers which are configured for interactive operation with said grinding table. The roller mill also comprises a feed chute for delivering solid material to be ground by gravity to said grinding table that is a conveyor that fluidizes the material as it is being delivered to the grinding table.

Abstract: An improved deflector structure for an updraft classifier mill for coal and ore is described. The improved deflector structure has an impingement surface which is characterized by a pattern of surface irregularities, either raised geometric figures or recesses of varying sizes and shapes to create turbulence in the air emerging from a rotating vane structure and impinging the deflector as it travels upwardly through the mill housing.