Abstract: Grate plate carriers are formed box-shaped having a planar cover plate that, extending in the product conveying direction, joins to the following cover plate and is provided with openings that are covered at a slight distance therefrom by the grate plate lying on top thereof and formed flat, so that slot-shaped air passage openings remain between the cover plate and the grate plate, said slot-shaped air passage openings discharging into correspondingly formed air passage slots of the grate plate; and in that every box-shaped grate plate carrier is independently connected to a cooling air delivery conduit.

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 roller mill such as a roll press or roll jaw crusher with crushing rollers and end face plates for lateral limitation of the nip mounted with pivotal links on the side walls of a product delivery chute and triangularly spaced support springs for the face plates urging them toward the nip with wear-resistant coatings on the inner surface of the face plates with the face plates having a lower removable extension.

Abstract: In known worm centrifuges comprising a solid bowl and a sieve bowl, a cleaning and predewatering of the solids/liquid mixture occurs in the solid bowl when dewatering solids/liquid mixtures and an after-dewatering of the solids occurs in the following sieve bowl. In general, a relatively good cleaning and dewatering effect is achieved with such previously-known worm centrifuges comprising a solid bowl. According to the invention, the after-dewatering effect in the sieve bowl can be quite substantially increased in that the conveyor worm is provided with agitator elements in the region of the sieve bowl, the agitator elements immersing into the solids layer. As a result thereof, in particularly, a circulation of the solids layer is achieved in the sieve bowl in a very advantageous manner and, as a result thereof, the after-dewatering of the solids before discharge from the worm centrifuge is very substantially improved.

Abstract: A control valve for a fuel injector, especially of an air-compressing, spontaneous-ignition, internal combustion engine. The control valve includes a valve body in the form of a piston valve which is axially movable in a housing chamber into a closure position and an open position, with the closure position being determined by a valve seat on the housing, and a seating surface edge on the piston valve. The housing chamber includes at least one high pressure connection, and a low pressure connection. The basic problem with a control valve of this general type is that when the piston valve strikes the valve seat, rebound movements are carried out by the piston valve, so that the closure position can only be reliably assumed after a certain time delay, thus negatively influencing the injection process.

Abstract: A method and mechanism for the separation of materials from a stream of pulverulent material such as cement including a rotatable plate onto which the material is fed with the material being centrifugally discharged in a bell shaped flow pattern, a radially inwardly directed flow of air across the veil carrying fine materials inwardly through a rotatable distributor; and coaxial dip tubes centrally located for receiving the gradations of fine material passing gravitationally downwardly, with the coarse materials remaining outside of the distributor and being received in a downward flow.

Abstract: A method and mechanism for the magnetic separation of material from a fluid containing magnetic and non-magnetic material, passing the fluid through matrix containing canisters wherein the canisters are carried on a turret which moves axially and rotatably. In four quadrilaterally arranged locations, two canisters are supported in a separation position within coils until they are filled and then are moved axially and rotationally to cleansing stations while cleansed canisters are rotated and moved axially up into the separation stations. A distribution head connects to the turret for delivery of magnetic material containing fluid and cleansing fluid.

Abstract: The invention relates to an apparatus and method for producing a free flowing coal suspension high in solids content. The coal is ground in at least two stages utilizing a mill having a calibrating effect in one stage and a mill without calibrating effect in another stage and adding a sub-quantity of viscosity reducing additive to the coal before each grinding. A drying of the coal or reconcentration of the suspension is not required. A roller mill operating on the principle of materials bed comminution is preferred as the non-calibrating mill in the first grinding stage and a rotating drum mill or a vibration grinding mill with rods as grinding bodies is preferred as the calibrating mill.

Abstract: A wet jig mechanism for handling coal or other minerals wherein a container receives a slurry of water and coal and the water is pulsed by delivering an alternate charge of compressed air beneath the surface of the water and alternately venting the area beneath the surface with the alternate pulsing and venting controlled by a pulsing valve having valve chambers with one chamber having ports connected beneath the surface of the container and to a source of compressed air in the other chamber connected beneath the surface of the liquid in the container and vented to atmosphere with the ports being controlled by butterfly valve plates in each chamber mounted on a common shaft and the chambers having liners or bushings rotatable to control the ports and time and duration of opening of the ports.

Abstract: A method and apparatus for the thermal treatment of pulverulent raw material in the manufacture of cement clinker including passing raw material first through a multi-stage preheating treatment including cyclones arranged following one another, next passing the material through a reaction stack for calcination, then passing the material through a sintering kiln and thereafter through a clinker cooler, the exhaust air from the clinker cooler and the exhaust gas from the sintering kiln being passed parallel to the each other with the material discharged into conduits respectively carrying the discharged clinker cooler air and the sintering gases with burners in the conduits and the gases thereafter passing up through the reaction stack and then through a separator and into the sintering kiln.

Abstract: For reducing the specific energy outlay in the grinding-drying of damp initial material, a circulating grinding system including a comminution machine, particularly an impact hammer, which is followed, via a sifter, by a high-pressure roll press operated in accord with the principle of product bed comminution, whereby the product admission of an impact hammer mill is connected to the feed for fresh initial material and the product discharge of a roll press is in communication with a product admission and/or with a product discharge of an impact hammer mill.

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: A first container for receiving fine-grained material to be dewatered with a concentric outer second container for receiving material from the first container and separating liquid, means for driving the containers in unison, circumferentially separated radial first and second plates connected to the first and second containers respectively, rubber blocks between the plates, and means for separately imparting vibration motion to the first and second containers with the vibrations being accommodated by the rubber blocks.

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 method and apparatus for calcining an aluminum hydroxide source to an aluminum oxide in which the amount of the .alpha.-modification can be controlled from very low to very high values. In accordance with the present invention, the calcination of the source material takes place in two stages, in the first of which the material is preheated with air and then passed to a fluidized bed calciner after which it is delivered to a holding cyclone. In the second stage, the previously calcined material which may contain up to about 80% of the .alpha.-modification is calcined further in a rotary tubular kiln which is followed downsteam by a cooler.

Abstract: A method and apparatus for controlling a worm centrifuge wherein the centrifuge drum is driven by a first hydraulic motor and the screw conveyor is driven by a second hydraulic motor and first and second valves are connected to control the flow of hydraulic fluid to the motors and the valves receive the full output of a constant delivery pump. Control of the valves is obtained by a torque measuring device measuring the torque input to the screw conveyor and the torque measuring device has a control which opens the valve to a motor for the screw conveyor with increase in torque and simultaneously closes the valve to the motor to the centrifuged drum proportionately so that the total flow of the pump is utilized by the motors.

Abstract: A method and apparatus for the pyrometallurgical treatment of fine grained solids such as non-ferrous metal ore concentrates with an oxygen-containing gas wherein the solids are mixed with the gas to form a suspension which is blown through a nozzle into a reaction chamber such as a vertical melting cyclone. In the reaction chamber, the solids are brought to reaction and melted. The invention is concerned with injecting a particle stream through the reaction zone as a focused open jet having mass flow velocity of greater than 50 kg/m.sup.2 .multidot.sec and having a linear speed of more than 35 m/sec. The particle stream is ignited by the hot combustion gases thereof or by a pilot flame. In a preferred embodiment of the invention, the particle stream is directed along a horizontal secant of the chamber to the opposite wall.

Abstract: A heat exchanger for cooling or preheating combustion air of a supercharged internal combustion engine. The heat exchanger is formed of a self-contained system including elements provided with a heat accumulating active medium which is in a heat exchange relationship with the combustion air. The elements of the self-contained system are preferably filled with a heat accumulating active medium which acts as a latent accumulator at operating temperatures.

Abstract: A control valve for a fuel injector, especially of an air-compressing, spontaneous-ignition, internal combustion engine. The control valve includes a valve body in the form of a piston valve which is axially movable in a housing chamber into a closure position and an open position, with the closure position being determined by a valve seat on the housing, and a seating surface edge on the piston valve. The housing chamber includes at least one high pressure connection, and a low pressure connection. The basic problem with a control valve of this general type is that when the piston valve strikes the valve seat, rebound movements are carried out by the piston valve, so that the closure position can only be reliably assumed after a certain time delay, thus negatively influencing the injection process.

Abstract: A cone crusher is provided for fine and superfine comminution and a high throughput performance. The largest open gap clearance between the crushing mantle and the crushing cone in the region of the crushing zone is not smaller than the grain size of the feed product to be comminuted as heretofore known, but larger than such grain size. A so-called stratified crushing occurs under the filling pressure of a relatively high column of feed product, wherein the grains of the feed product are not individually crushed per se between the crushing tools, but largely mutually crush one another in the crushing gap.