Abstract: A horizontal axis pulverizing and classifying apparatus fitted with special means for removing contaminants, such as abrasive particles, which reduce the capacity and efficiency of such apparatus. The contaminant take-out device is a porous tubular duct communicating with the classification zone of the apparatus through the housing wall. The porous tubular duct is surrounded by a non-porous tubular casing forming an annulus connected to a source of gas under pressure by means of which the quantity of contaminant tailings is removed by varying the amount and pressure of gas introduced. The apparatus may also include a plurality of gas flow apertures surrounding the classification zone and directed generally radially inward, and means for selectively and variably introducing gas to those apertures, for providing improved control over the contaminant take-out device.

Abstract: A horizontal axis pulverizing and classifying apparatus characterized by a plurality of gas flow passages in a narrow band surrounding the classification zone and directed generally radially inward, and means for selectively and variably introducing gas to those passages. The apparatus may also be fitted with special means for removing contaminating particles which reduce the capacity and efficiency of such apparatus. The take-out device is a porous tubular duct communicating with the classification zone of the apparatus through the housing wall. The porous tubular duct is surrounded by a non-porous tubular casing forming an annulus connected to a source of gas under pressure. Control over the quantities of tailings recycled and over quantities of contaminants removed is exercised by varying the amount and pressure of gas introduced through the gas flow passages.

Abstract: An impact scrubber for removing coating materials from the surfaces of particulate matter such as foundry sand and the like comprises a lift tube open adjacent upper and lower ends for containing a high velocity fluidized stream of said particulate matter. A fluid injector is mounted adjacent the lower end of the lift tube for moving the particulate matter into the lift tube to form an upwardly flowing, high velocity turbulent fluidized stream. An adjustable inlet valve is provided adjacent the fluid injector for regulating the flow of sand into the high velocity stream of fluid moving into the lift tube. A target is spaced above the open upper end of the lift tube providing an impact area for receiving the flow of high velocity fluidized particulate matter which impacts against the target. The coating material is loosened from the sand grains by the impact at the target and during the turbulent flow.

Abstract: A combined vane-rotor separator comprises a rotor, which has upstanding illor baffle rails arranged at the outer periphery thereof. A housing surrounds the rotor to which a feed mixture is supplied in a gas flow from a roll mill and from which the gas and fines leave through a draw-off duct. A cone is located below the rotor and is attached to the housing. A series of guide vanes arranged in a ring is located between the housing and the cone and serves as a guide for the gas flow from the roll mill.

Abstract: The invention relates to a method and apparatus for opening packaged articles, particularly packs and cartons of cigarettes, in which such items are ripped open and broken apart sufficiently to allow the contents, e.g. tobacco, to be separated and recovered. The apparatus aspects of this invention involve a ripper fan, a recycling air leg, and a cyclone separator from which the materials are recovered for further processing.

Abstract: A mill for the pulverizing and classification of particles utilizing an impact rotor to obtain the reduction of large chunks and particles of materials by impaction between lining plates and hammers mounted on the rotor. The lining plates are mounted on adjustable walls of an impact reduction chamber in a position to be impacted by the particles thrown from the impact rotor hammers. Particles are then carried by vertical air flow into vertically stacked classification chambers which are located directly above the attrition chamber. Gravity and deflector plates cause the return of some of the particles which receive a secondary impact with the impact rotor producing a continuous interchange of particles and resulting in the autogenous attrition of the particles between the rotor and lining plates. Another feature of the present invention is the utilization of a "fluidizer" to maintain the flow of particles which accumulate at the bottom of the impact reduction chamber.

Abstract: Method of and apparatus for reducing material by grinding and for handling the ground product in a system that minimizes the production of a product containing a high percentage of extreme fines so that the product is more uniform in size and the apparatus is more efficient in producing that product.

Abstract: A coal slurry drier which comprises a pulverizer having a housing enclosing a pulverizing zone including horizontally disposed upper and lower grinding rings. A circular row of rotatable grinding elements is positioned between the upper and lower rings. Heated carrier air is passed through the pulverizing zone. A conduit delivers the coal slurry to the pulverizer for drying and pulverization. The conduit includes an insulated portion extending through the housing and has its outlet located within the pulverizing zone.

Abstract: This invention provides an apparatus for the preparation of dry-medicament granulation. The apparatus comprises an enclosed-circular mixing chamber containing mixing means with a separate air inlet means and air outlet means, both of which are in flow communication with the chamber. The air outlet means is provided with a collecting bag for collecting the dry-fine particles of the medicament granulation and is equipped with a vibrator for returning them to the mixing chamber. The apparatus provides a means for a one step preparation in a batch process of medicament granulations, whereby the granulations may be directly compressed into solid-dosage forms without further processing.

Abstract: A roller crushing mill has a housing within which is a plurality of angularly spaced crushing rollers that bear on a grinding plate rotatable about a vertical axis. Above each roller is a sifter for the reception of crushed material. Nozzles positioned in the vicinity of the rollers establish upwardly directed airstreams at the periphery of the grinding plate to entrain crushed material thrown off the grinding plate and deliver such crushed material to the sifters. Other nozzles positioned between adjacent ones of the rollers at the periphery of the grinding plate direct airstreams inwardly of the plate toward the crushing track to feed material to the crushing track.

Abstract: The invention concerns an apparatus for crushing, by means of a rotary mill, material containing particles that are difficult to pulverize. The mill has an air-sifter with pneumatic supply of ground material, where the coarse-material discharge of the air-sifter is connected to the intake side of the mill, and has a mechanical conveyor whose intake side is connected to the coarse-particle discharge of the mill and whose discharge is connected to the intake side of the mill.

Abstract: An air-swept tube mill having at least two grinding chambers and a discharge chamber, an internal by-pass means in the last grinding chamber in communication at one end with the grinding chamber immediately preceding the last grinding chamber and at the other end, with the discharge chamber, whereby material ground in the first chamber is transferred through the by-pass directly to the discharge chamber and oversize material is transferred from the discharge chamber to the last grinding chamber for further grinding. A unique method is disclosed in which grinding of material takes place in a first grinding chamber of a tube mill and by-passed into a discharge chamber. The method further comprises feeding oversize materials from the discharge chamber into a last grinding chamber for additional grinding thereof.