Abstract: Vacuum cleaner hose for connecting to a wet and dry vacuum cleaner, wherein the vacuum cleaner hose has an inner lumen extending in the longitudinal direction, wherein a flow guiding geometry is formed within the lumen or adjoining the lumen, by which a suction flow occurring during the operation of the wet and dry vacuum cleaner can be influenced.

Abstract: Systems, methods, and apparatuses are described for accelerating projectiles at high velocity. A barrel may include one or more heaters configured to heat a bore of the barrel prior to launch of a projectile. The barrel bore may be formed in a tungsten sleeve and may be heated to high temperatures. Heat from the barrel bore may be transferred to expanding propellant behind a projectile as it travels through the barrel bore.

Abstract: A system for conveying pasty material through a conduit has an eccentric screw pump having a stator, a rotor that rotates in the stator, a housing with an intake port, and an output port connected to the conduit. A drive rotates the rotor and thereby draws the pasty material in through the intake port and expels the drawn-in material as a compressed-material strand into the conduit. A valve supplies gas pulses to the conduit at time intervals for separating the compressed-material strand into material plugs of limited length traveling through the conduit.

Abstract: Manufacture is carried out in a continuous manner while simultaneously loading the blast holes in a device with mixing capability where (a) a less sensitive or non-explosive water-based matrix containing a cross-linkable polymer, (b) a cross-linking agent for cross-linking the polymer contained in the matrix, (c) a gas-generating agent, are mixed. The presence of the polymer distributed uniformly in the matrix together with the cross-linking agent results in a three-dimensional network formed by molecular polymer chains bound to one another in a short period of time after mixing. The process can be performed in trucks for loading explosives in blast holes having compartments for the different components of the mixture and one or several mixing devices allowing the manufacture of the final mixture which would be unloaded into the blast holes either by means of a pump or an auger.

Abstract: Method for treating outlet air in a pneumatic waste conveying system, in which the outlet air is at least partly the conveying air to be used in waste conveying. In the method in a first phase additional air is brought into the body of conveying air in the partial-vacuum generator of the pneumatic waste conveying system before the output aperture of the partial-vacuum generator, and that in the method in a second phase additional air is brought into the body of outlet air as a consequence of the suction effect brought about by the outlet air in such a way that the outlet air and the additional air mix with each other at least partly. The invention also relates to an apparatus.

Abstract: Pneumatic conveying of fine solids in the direct synthesis of alkylchlorosilanes conveying gas containing at least 50% by volume of alkyl chloride. The conveying apparatus preferably contains a means for switching conveying gas in the pneumatic conveying of fine solids.

Abstract: A system for dewatering a stream of slurry has a first and a second separator. The first separator removes objects above a first size, to produce a stream of primary treated slurry. The second separator removes objects above a second size from the primary treated stream, the second size being smaller than the first size. Optionally, a third separator removes objects above a yet smaller third size from the stream of secondary treated slurry. The first separator has a plurality of sieve mat supports alternately connected to a main support frame section and a movable support frame section so that the flexible sieve mat can be agitated by the movable support frame section, a collector being provided for collecting the primary treated slurry passing through the flexible sieve mat. In an optional step, water contained in the separated solids is removed.

Abstract: The invention relates to a device for pneumatically conveying powder, the device having an injector with a conveying gas connection and a metering gas connection as well as a powder intake channel connected in terms of flow to the injector. To achieve the effect that the powder conveying device can be effectively flushed through in the cleaning mode of said device, it is provided according to the invention that a purging gas connection, which is connected or can be connected to a purging gas line, is provided between the negative pressure region of the injector and the powder intake opening of the powder intake channel for the feeding, as and when required, of purging gas, in particular compressed purging air. Furthermore, a shut-off element is assigned to the purging gas connection to prevent purging gas from being able to escape from the powder output opening of the powder intake channel.

Abstract: A system for dewatering a stream of slurry has a first and a second separator. The first separator removes objects above a first size, to produce a stream of primary treated slurry. The second separator removes objects above a second size from the primary treated stream, the second size being smaller than the first size. Optionally, a third separator removes objects above a yet smaller third size from the stream of secondary treated slurry. The first separator has a plurality of sieve mat supports alternately connected to a main support frame section and a movable support frame section so that the flexible sieve mat can be agitated by the movable support frame section, a collector being provided for collecting the primary treated slurry passing through the flexible sieve mat. In an optional step, water contained in the separated solids is removed.

Abstract: A method of producing treated liquid hydrocarbons. The method begins by pressurizing a latex in a pressure vessel. This is followed by flowing the latex from the pressure vessel into a pipeline containing liquid hydrocarbons to produce treated liquid hydrocarbons. In this embodiment the latex comprises a drag reducing polymer.

Abstract: A method begins by obtaining a slipstream of a liquid. The slipstream of liquid is then mixed upstream of an injection pump with a latex comprising a drag reducing polymer to produce a drag reducing mixture. The drag reducing mixture is then injected into a liquid hydrocarbon to produce a treated liquid hydrocarbon.

Abstract: A method includes the steps of: adding an organic surface cross-linking agent to a water absorbent resin having a cross-linked structure; adding a liquid permeability improving agent to the water absorbent resin concurrently with or after the addition of the organic surface cross-linking agent; and then adding a lubrication improving agent to the water absorbent resin. This provides a particulate water absorbing agent and a method for producing it, the particulate water absorbing agent being suitable for pneumatic transportation, suffering no decrease in the effect of the liquid permeability improving agent, and excelling in properties such as fluidity and damage resistance after the pneumatic transportation.

Abstract: A method of preparing a drag reducing polymer wherein the drag reducing polymer is able to be injected into a pipeline, such that the friction loss associated with the turbulent flow through the pipeline is reduced by suppressing the growth of turbulent eddies. The drag reducing polymer is injected into a pipeline of liquid hydrocarbon hydrocarbon having an asphaltene content of at least 3 weight percent and an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon wherein the viscosity of the treated liquid hydrocarbon is not less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer. The drag reducing polymer has a solubility parameter within 4 MPa1/2 of the solubility parameter of the liquid hydrocarbon. The drag reducing polymer is also added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw.

Abstract: A method of introducing a drag reducing polymer into a pipeline such that the friction loss associated with the turbulent flow though the pipeline is reduced by suppressing the growth of turbulent eddies. The drag reducing polymer is introduced into a liquid hydrocarbon having an asphaltene content of at least 3 weight percent and an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon. The treated liquid hydrocarbon does not have a viscosity less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer. Additionally, the drag reducing polymer is added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw.

Abstract: A method of introducing a drag reducing polymer into a pipeline such that the friction loss associated with the turbulent flow though the pipeline is reduced by suppressing the growth of turbulent eddies. The drag reducing polymer is introduced into a liquid hydrocarbon having an asphaltene content of at least 3 weight percent and/or an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon. The treated liquid hydrocarbon does not have a viscosity less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer. Additionally, the drag reducing polymer is added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw.

Abstract: Guiding system defining a moving path for containers having a collar, the system being adapted to be associated to a system for applying a pneumatic force on said containers so as move the containers the one after the other along the moving path according to a forward moving direction, the guiding system including at least a component for reducing the friction between at least the collar of the containers and guide profiles of the guide system, wherein the component includes lubricant dispensing channels having each an inlet, and an outlet associated to a groove.

Abstract: A system for reducing pressure drop associated with the turbulent flow of asphaltenic crude oil through a conduit. The crude oil has a high asphaltene content and/or a low API gravity. Such reduction in pressure drop is achieved by treating the asphaltenic crude oil with a high molecular weight drag reducing polymer that can have a solubility parameter within about 20 percent of the solubility parameter of the heavy crude oil. The drag reducing polymer can also comprise the residues of monomers having at least one heteroatom.

Abstract: A method in a pneumatic material conveying system, such as a waste conveying system, which conveying system comprises at least one feed point (61) of material, particularly of waste material, a material conveying pipe (100) which is connectable to the feed point (61), a separator device (20) in which the material being conveyed is separated from conveying air, and means (3) for providing a pressure difference in the conveying pipe (100) at least during the conveyance of the material. At least a part of the conveying piping (100) is connectable as a section of the circuit in which conveying air is circulated and, in the method, at least a part of the conveying piping (100) is flushed and/or dried with air and/or material is conveyed in the circuit by circulating conveying air in the circuit, particularly by blowing in the circuit with a pump device (3).

Abstract: A system for forming an insulation particle/air suspension suitable for use in a process for forming an insulation product is provided, comprising: a blowing machine for forming an insulation particle/air suspension, wherein the blowing machine comprises at least one outlet; a first hose in communication with the outlet, for transporting at least the suspension from the blowing machine; and a booster fan in communication with the first hose, wherein the booster fan is located downstream from the blowing machine.

Abstract: A method includes the steps of: adding an organic surface cross-linking agent to a water absorbent resin having a cross-linked structure; adding a liquid permeability improving agent to the water absorbent resin concurrently with or after the addition of the organic surface cross-linking agent; and then adding a lubrication improving agent to the water absorbent resin. This provides a particulate water absorbing agent and a method for producing it, the particulate water absorbing agent being suitable for pneumatic transportation, suffering no decrease in the effect of the liquid permeability improving agent, and excelling in properties such as fluidity and damage resistance after the pneumatic transportation.

Abstract: A microfabricated sheath flow structure for producing a sheath flow includes a primary sheath flow channel for conveying a sheath fluid, a sample inlet for injecting a sample into the sheath fluid in the primary sheath flow channel, a primary focusing region for focusing the sample within the sheath fluid and a secondary focusing region for providing additional focusing of the sample within the sheath fluid. The secondary focusing region may be formed by a flow channel intersecting the primary sheath flow channel to inject additional sheath fluid into the primary sheath flow channel from a selected direction. A sheath flow system may comprise a plurality of sheath flow structures operating in parallel on a microfluidic chip.

Abstract: Disclosed is a method and system for controlling the formation of liquid or gas slugs along a pipeline. In embodiments, an injection unit injects a liquid surface tension reducing agent, such as a foamant, into the pipeline upstream of the high point. A control unit can be used to control the injection unit. In certain arrangements, the control unit adjusts the injection of the agent based on measured parameters of interest. In embodiments where the control unit utilizes temperature measurements, one or more temperature sensors are positioned along the pipeline. The control unit utilizes the temperature measurements to determine whether a predetermined condition exists or a liquid or gas slug is present.

Abstract: An apparatus for pneumatically conveying particulate material containing reaction products of a high pressure reactor from a supply vessel at a pressure of at least two bar to a receiving vessel at a considerably lower pressure. The apparatus includes a conveyor line attached to the supply vessel, a collecting vessel between the conveyor line and the receiving vessel, the collecting vessel including (i) a discharge conduit for the carrier gas, (ii) a device for controlling the discharge velocity of the carrier gas from the collecting vessel, and (iii) a device for controlling the pressure of the material collected in the collecting vessel, and a device for conveying the material directly from the collecting vessel to the receiving vessel essentially at the same pressure as is prevailing in the receiving vessel.

Abstract: A fluid barrier along the inside surface of ductwork between a reactor and subsequent product separation and recovery apparatus to reduce the buildup of solids on the ductwork from a gaseous product mixture conveyed through the ductwork. Barrier fluid is sprayed along the internal surface of the ductwork to form a fluid barrier and cool the gaseous mixture. The barrier fluid can be comprised of a component of the gaseous mixture. The barrier fluid can be a liquid at the second temperature and converted to a gaseous state in the ductwork, using the heat of vaporization of the barrier fluid to help cool the gaseous mixture.

Abstract: An apparatus and method for supplying multi-color powder paint material to an applicator in which at least one canister is used. This invention can be utilized with multiple or with a single color of powder paint material. The preferred system includes two canisters that alternate in supplying powder to the applicator. While one canister supplies powder to the applicator, the other canister is purged of the previous material and filled with the next material to be sprayed. The canister has an interior sized to store a predetermined quantity of powder material. During operation, a powder transfer pump and a color changer transfer powder material from a storage container/hopper to the canister interior. A venturi pump then supplies the applicator with powder. After the object is painted, purge air is opened and the canister is purged of the previous material. The canister is then ready to start another cycle.

Abstract: A transport system for a spherical object. The transport system has a supply of a first fluid and a passageway for communication of a spherical object in a path between an inlet and an outlet. At least part of the passageway is bounded by a first tube having a first annular wall with at least one opening through the first annular wall. The first tube guides flow of a spherical object in the first fluid from the inlet towards the outlet. The transport system further includes a source of vacuum in communication with the passageway through the at least one opening through the first annular wall. The source of vacuum produces a low pressure region which causes the first fluid in the passageway to be drawn from the passageway through the at least one opening through the first annular wall. The transport system further includes a supply of a second fluid which is in communication with a spherical object moving between the inlet and the outlet.

Abstract: A spherical object supplying apparatus is to positively and smoothly supply, when spherical objects such as spherical single crystal silicons are supplied from a storing container such as a hopper to the following processing or manufacturing station (or apparatus), the spherical objects one at a time. The apparatus comprises: a supplying pipe path coupled to a spherical object storing container; a branch pipe which branches from the supplying pipe path; and a fluid supplying apparatus adapted to introduce pressurized fluid into the branch pipe path. The spherical objects are accelerated by the pressurized fluid which is jetted through the branch pipe path into the supplying pipe path.

Abstract: A miniaturized, inexpensive instrument for measuring the mass flow rate of powder, which is capable of directly outputting the mass flow rate of powder and whose characteristics are not influenced by the kind and physical properties of the powder. The instrument can be easily manufactured, installed, operated, maintained, and color change can be easily done. A constant powder feeder, which is constructed based on this instrument and an electrostatic powder coating system utilizing this feeder has a high performance and a high operational efficiency. A measuring gas with a regulated flow rate is turned into a thin-layer of high-speed gas jets by a dispersion means, thereby powder is cross-dispersed and introduced into a measuring tube, the pressure difference generated therein is measured, and a feeding means is subject to feedback control so that the output of the pressure difference coincides with a set value.

Abstract: An environmentally compliant triboelectric applicator and process for coating or ablating a substrate and for retrieving excess or ejected material from the substrate. The applicator comprises an inner supersonic nozzle for accelerating triboelectrically charged projectile particles entrained in a supersonic gas to speeds sufficiently high to coat or ablate a substrate. The applicator further comprises an outer evacuator nozzle coaxially surrounding the inner supersonic nozzle for retrieving excess projectile particles, ablated substrate powders, or other environmentally hazardous materials. A fluid dynamic coupling uses the efficacy of the Mach turning angle associated with a supersonic boundary layer of carrier gas to aspirate the central core of the supersonic two-phase jet.

Abstract: A apparatus for carrying spherical objects is adopted, which comprises: a housing 1; a cylindrical rotor 6 arranged in the housing, including a plurality of recess grooves 11 which are open to the outer circumferential surface, the plurality of recess grooves being arranged radially from the center of the rotor 6; a guide ring arranged in the housing, the guide ring 3 including an inner hole 5, the section of which is elliptical, in which the cylindrical rotor 6 is accommodated; a vane 12 slidably arranged in each recess groove 11; a first carrier atmosphere feeding pipe 16 connected with a converting section of the guide ring 3 in which the inner hole 5 is changed from a small diameter section to a large diameter section; a first carrier atmosphere discharging pipe 17 connected with a converting section of the guide ring 3 in which the inner hole 5 is changed from a large diameter section to a small diameter section; a second carrier atmosphere feeding pipe 18 connected with a converting section of the guide

Abstract: An effluent gas stream treatment system for treatment of gaseous effluents such as waste gases from semiconductor manufacturing operations. The effluent gas stream treatment system comprises a pre-oxidation treatment unit, which may for example comprise a scrubber, an oxidation unit such an electrothermal oxidizer, and a post-oxidation treatment unit, such as a wet or dry scrubber. The effluent gas stream treatment system of the invention may utilize an integrated oxidizer, quench and wet scrubber assembly, for abatement of hazardous or otherwise undesired components from the effluent gas stream. Gas or liquid shrouding of gas streams in the treatment system may be provided by high efficiency inlet structures.

Abstract: A clog-resistant inlet structure for introducing a particulate solids-containing and/or solids-Forming gas stream to a gas processing system. The structure is composed of a gas-permeable wall enclosing a gas flow path, and an outer annular jacket circumscribing the gas-permeable wall to define an annular gas reservoir therebetween. The clog-resistant inlet structure is constructed, arranged, and operated so as to introduce a gas into the annular gas reservoir during the flow of the particulate solids-containing and/or solids-forming gas stream to a gas processing system through such inlet structure at a pressure sufficient to combat the deposition or formation of solids on the interior surface of the gas-permeable wall. The inlet structure may further optionally include a downstream annular section in which the wall surface bounding the gas stream is blanketed with a falling liquid film, to combat solids deposition or formation on the blanketed wall surface.

Abstract: A clog-resistant inlet structure for introducing a particulate solids-containing and/or solids-forming gas stream to a gas processing system, including: a gas-permeable wall enclosing a gas flow path, and an outer annular jacket circumscribing the gas-permeable wall to define an annular gas reservoir therebetween; and a flow passage for introducing a gas into the annular gas reservoir during the flow of the particulate solids-containing and/or solids-forming gas stream to a gas processing system through such inlet structure at a pressure sufficient to cause the gas to permeate through the gas-permeable wall to combat the deposition or formation of solids on the interior surface of the gas-permeable wall. The inlet structure may further optionally include a downstream annular section in which the wall surface bounding the gas stream is blanketed with a falling liquid film, to combat solids deposition or formation on the blanketed wall surface.

Abstract: A bag dumping station for receiving particulate materials from rupturable bags or other portable containers is provided with a vacuum facility with a direct inlet to the hopper of the station and includes an ejector for providing motive gas for vacuum conveying particulate solids from a drum or spilled materials from broken bags.

Abstract: A powder delivery apparatus for use in a paint supply system. The apparatus has a flexible inner hose having an innermost and outermost surface with pores extending therebetween. The innermost surface defines a channel along which powder particles may flow. Surrounding and extending coaxially with the inner hose is a flexible outer hose. The innermost surface of the flexible outer hose and the outermost surface of the inner hose define an annular path that is charged with air. The air is forced under pressure radially inwardly through the pores to the inner hose so that during powder flow, powder particles are atomized and prevented from fusing to the innermost surface of the inner hose. Thus, powder build-up and impact fusion are avoided in the inner hose. Accordingly, consistent powder flow rates and supply pressures are promoted.

Abstract: An improved method and device to prevent erosion of slurry transport devices is disclosed which uses liquid injection to prevent contact by the slurry composition with the inner surface of the walls of the transport system. A non-abrasive liquid is injected into the slurry transport system and maintains intimate contact with the entire inner surface of the transport system, thereby creating a fluid barrier between the non-abrasive liquid and the inner surface of the transport system which thereby prevents erosion.

Abstract: A solid material, such as sand, mineral tailings, aggregate, or sludge is selected and treated to wet the surface of the material. A low moisture content foam is generated by passing a gas through a mixture of water and a surfactant, wherein the foam has a foam weight in the range from 15-50 gm/l. The solid material then is mixed with a quantity of the foam from 2-80% by resulting volume, sufficient to create of a foam-based slurry product having plug flow characteristics when pumped through a pipeline. The mixing can be accomplished by batch process or continuous flow processes. The slurry product is pumped through a pipeline and is regenerated as required within the pipeline by injecting additional foam into the slurry product while, substantially at the same time, mixing the slurry product with the additional foam by passing it over a mixing foil, which is especially effective in a bend of the pipe.

Abstract: A hydraulic liquid transporter for changing of different pressure and flows prevailing in three chambers that are separated from each other, having a slurry filling pump that has a suction side and a pressure side, the suction side of being connected to a mixture collecting container, the pressure side being connected to a first pressure line, a feeding space having of three feeding chambers being connected from said first pressure line, a discharging forwarding liquid pump having a suction side and a pressure side, the pressure side of the discharging forward liquid pump being connected to a second pressure line which is connected to a mixture delivering line, a discharge forwarding line connecting the suction side of the discharging forwarding liquid pump from the feeding space, a first integral flow reversing device for connection said first pressure line from said discharge forwarding line through said feeding space, a second integral flow reversal device for connecting said second pressure line from said

Abstract: Method of applying a layer of air-sprayed concrete onto a surface, wherein a pumpable and sprayable mixture of air-sprayable concrete is prepared from cement, aggregates, optional additives, and water. A given mass flow of the mixture of air-spray concrete is sprayed by means of a concrete feed pump through a concrete feed line to a spraying apparatus with a device for the introduction of propelling air under a feed pressure of several bars. The propelling air is charged with synthetic silica exhibiting a BET surface of at least 25 m.sup.2 /g. The synthetic silica is added with the propelling air into the mass flow of the mixture of air-spray concrete in such an amount that the applied air-spray concrete experiences a spontaneous temperature elevation of a few degrees Kelvin immediately after application. A spraying apparatus for the method is also shown.

Abstract: An apparatus for vacuum conveyance and aerosol treatment of poultry has a receiving pipeline which is mounted to extend in an inclined position and connected to an elevator pipe having openings for communication with a vacuum chamber which is connected to a vacuum source and to a discharge pipe. The vacuum source have a vacuum pipe and a pressure pipe. An aerosol chamber having an aerosol generator is provided in a starting portion of the receiving pipeline and communicates with the pressure pipe of the vacuum source. A base of the aerosol chamber is formed by the inner surface of the receiving pipeline. An adapter portion between the receiving pipeline and the aerosol chamber on the side of the elevator pipe is in the form of a flare pipe.

Abstract: A method and apparatus for fabricating coal logs from crushed coal available at a mining site and for transporting coal logs through a pipeline to a combustion site for further coal processing and burning. The pipeline is operated to maintain the hydraulic carrier fluid flowing through the pipeline within a range of bulk velocities sufficient to force a layer of the hydraulic carrier fluid between contacting surfaces of each coal log and the pipeline, tending to lift and carry the coal log through the pipeline, and, thereby, significantly reduce the energy required to transfer the carrier fluid and the coal logs through the pipeline. The carrier fluid bulk velocity is also maintained sufficiently low to prevent unstable coal log flow behavior often resulting in coal log jamming and abasion. The range of optimum fluid bulk velocities is a function of various fluid and coal properties, the pipeline geometry and the coal log geometry.

Abstract: An apparatus and method for improved in-car slurrying of dry bulk powder is described. The apparatus includes a plurality of mutually spaced conduits which extend downwardly from a manifold through the center of each hopper compartment in a hopper car, each conduit opening about one foot above the bottom of the compartment. As water is admitted at the bottom of each compartment, air under pressure is dispensed through the conduits to aerate the center of the bulk powder in each compartment, and the conduits themselves provide a path for the water upwardly through the center of the bulk powder.

Abstract: A method and apparatus for improved in-car slurrying of dry bulk powder in hopper cars is disclosed. The individual hopper car compartments have ports in the bottom therein for admitting air under pressure and water to form the slurry. The apparatus of this invention includes an open mesh disposed across the upper portion of the hopper car at about the level of the dry material. When air and water are pumped into the bottom of the hopper car compartment, the pumping action causes the dry material to impact the mesh whereby clumps thereof break up and become wetted. Air passes upwardly through the mesh then but clumps of unwetted powder do not. A central port is provided in the mesh for filling the compartment with dry bulk powder.

Abstract: Apparatus is disclosed for use in the manufacture of rod like elements, for example cigarette filters formed of filamentary tow, for dissipating conveying gas from a conduit through which the tow is conveyed pneumatically through a series of processing stations. To effectively dissipate the gas from the conduit, the invention provides axially spaced rings of gas dissipation ports in the conduit. The ports in the upstream rings are inclined rearwardly to provide gas dissipation in a direction which is counter-current the direction of travel of the tow through the conduit. The ports in adjacent rings are offset circumferentially so as to improve the distribution of ports around the circumference of the conduit in the section used for gas dissipation.

Abstract: A powder spray gun and method of spraying powder wherein an inverted air flow amplifier is located adjacent to the inlet of the gun to enhance blending of powder within the gun and to facilitate sharp cut off and start up of powder flow from the gun. From the inverted air flow amplifier, the blended powder is supplied to a downstream air flow amplifier operable to draw ambient air into the downstream air flow amplifier and to impact the air entrained powder passing through the downstream amplifier with a high velocity stream of compressed air so as to accelerate the velocity of powder emitted from the gun. Powder is supplied to the upstream inverted air flow amplifier through a pair of intersecting inlet ports between which there is a separating baffle.

Abstract: A slurry of solid particles suspended in water or some other liquid is elevated in a riser tube, extending upward from a closed vessel, under hydraulic pressure from the same liquid descending into the vessel from a hydrostatic column whose height is less than that of the riser tube; liquid exiting at the top of that tube is recirculated to the vessel through the column after being freed from the accompanying solids. The excess height of the riser tube is made possible by the admission of bubbles of air or some other gas into the tube at its lower end. Fresh particles to be entrained by the rising liquid are fed into the closed vessel via a gated conduit maintaining the hydrostatic pressure therein.

Abstract: Process and apparatus for preparing a substantially uniform, gas-containing cement slurry by directing two pressurized streams of a gas-containing hydraulic cement slurry to a common in-line focal point in a generally opposed fashion so that good mixing is achieved by the contact of the two streams. The process is particularly adapted for use in preparing "foamed" cement slurries for cementing subterranean voids such as well boreholes, groutholes, natural cavities and similar voids.

Abstract: The invention relates to a device for the preparation and injection of sealing cement for bolts in propping gallery roofs and walls in mines, quarries or tunnels. The device of the invention comprises a flexible pouch contained in a rigid housing which is connected to a liquid supply system and an injection nozzle that is double-walled along its entire length, the inner nozzle receiving pulverulent cement from the flexible pouch and the outer ring of the nozzle being supplied with water. Thus, the cement and water are separately introduced into a bore for the bolts and the mixing process takes place in the bore.

Abstract: A continuous process for blending coal with a water immiscible liquid produces a uniform, pumpable slurry. Pulverized raw feed coal and preferably a coal derived, water immiscible liquid are continuously fed to a blending zone (12 and 18) in which coal particles and liquid are intimately admixed and advanced in substantially plug flow to form a first slurry. The first slurry is withdrawn from the blending zone (12 and 18) and fed to a mixing zone (24) where it is mixed with a hot slurry to form the pumpable slurry. A portion of the pumpable slurry is continuously recycled to the blending zone (12 and 18) for mixing with the feed coal.

Abstract: A method of transporting particulate solid material through a pipeline in the form of a stable foam slurry. There is formed a pumpable slurry of the particulate solid material in a stable foam carrier medium and the slurry is flowed through the pipeline to a receiving point.