Abstract: The present invention provides a concentration type aggregation reaction apparatus having a concentration screen, which enables an aggregation reaction to be conducted in sludge and the sludge to be concentrated by separation of a liquid by means of a single apparatus. The concentration screen is in a cylindrical form and includes slits having horizontal openings. A decelerating device is connected to an upper portion of a shaft for an agitator for agitation in the tank and brushes are connected to the decelerating device. The brushes are adapted to revolve along opposite surfaces (on a primary side and a secondary side) of the screen. By use of these brushes, aggregates adhered to the screen are continuously removed.

Abstract: A system for providing improved bulk liquid mixing and effective gas-liquid contacting for mass transfer of the gas to the liquid, especially a non-Newtonian liquid, the viscosity of which decreases when under shearing conditions (shear thinning), in an upright tank. A process, such as fermentation which produces commercial quantities of polysaccharides such as xanthan gum. may be carried out in the tank. An upright draft tube is mounted within the tank and has a lower end spaced from the tank bottom and an upper end spaced below the surface of the liquid in the tank. A plurality of mixing impellers in the draft tube are sufficiently close to each other to establish a field or pattern of agitation to cause shear thinning and upflow throughout the draft tube and which may produce turbulence at the liquid surface. A plurality of radially inwardly projecting. circumferentially spaced baffles extend from the draft tube and are proximate the mixing impellers to prevent swirling of the liquid within the draft tube.

Abstract: The disclosed apparatus includes a stator and a rotor disposed for rotation within the stator. An inner wall of the stator defines one or more collider chambers. Rotation of the rotor causes movement of fluid disposed between the rotor and stator and establishes a rotational flow pattern within the collider chambers. The fluid movement induced by the rotor increases the temperature, density, and pressure of the fluid in the collider chamber.

Abstract: Excessive vibration in industrial mixers such as flotation cells and draft tube mixers is attenuated by connecting a vibration dampening device to a rotor or impeller which is disposed in a mixing tank for pumping a nonhomogeneous fluidic material placed in the tank. In a draft tube mixer, where the rotor is connected to a drive shaft in turn connected to a motor for rotating the rotor, the vibration dampening device is connected to the shaft on a side of the rotor opposite the motor. In a froth flotation cell, if the rotor is hollow, the vibration dampening device is disposed inside a pipe in turn mounted inside the rotor along an axis thereof. The vibration dampening device takes the form of a tuned mass dampener tuned to a resonance frequency of the particular mixing apparatus.

Abstract: The first agitating impeller and the second agitating impeller, which are arranged in the addition solution mixing chamber dipped in the primary component solution stored in the reaction vessel, are rotated independently from each other in the reverse direction, so that the generation of vortexes is suppressed.

Abstract: A mixing apparatus for mixing black liquor from cellulose production with ash from flue gases which is generated on combustion of black liquor. The mixing apparatus contains a cylindrical tank, a stirrer mechanism having a propeller secured on the upper part of a vertical shaft, rotating baffles secured on the lower part of the shaft, and stationary, vertical, radial baffles arranged around, and at a distance from, the rotating baffles. The invention also provides a method for mixing black liquor and ash.

Abstract: The present invention is directed to an apparatus and method for providing absorption of two fluid phases with one another and for the magnetic treatment of the phases for molecular realignment for effective separation of contaminants.

Abstract: A metallic flake manufacturing device uses a bearing to form the flakes. The bearing is located within a container which receives a fluid having suspended metallic particles. The bearing has an outer race, an inner race, and a plurality of bearings disposed between the races. The bearings are immersed in the fluid for flattening the suspended particles into flakes. A shaft extends into the container. The shaft engages one of the races for rotating it relative to the other race.

Abstract: A rotor-stator assembly having a stator and a rotor for mixing and emulsifying materials in which the rotor includes wedge-shaped rotor blades and the stator includes generally V-shaped openings which together impart additional and increased high speed shearing forces and/or pressures on the mixture thereby resulting in a finer reduction of agglomerates and mixture uniformity. The rotor blades preferably comprise a wedge-shaped leading edge and desirably the blades have a V-shaped cross-section. The stator preferably includes a first plurality of elongated, spaced-apart slots, and a second plurality of spaced-apart slots. The slots are disposed so as to define a generally V-shaped configuration around the circumference of the stator.

Abstract: A blender apparatus specifically adaptable for intermixing solid and liquid materials is made up of a housing for an impeller assembly having upper and lower impeller portions and wherein liquid directed into the lower impeller portion is redirected axially into the upper impeller portion for intermixing with solid materials directed into the upper impeller portion and undergo outward radial movement through the upper impeller portion into an outer peripheral area surrounding the impeller portions for subsequent discharge therefrom.

Abstract: A mixing apparatus has a tank for holding a material to be mixed, a drive shaft rotatable in the tank, a radially inner impeller on the drive shaft with blades pitched to produce axial flow of the material in a first direction, and a radially outer impeller with blades pitched to produce axial flow in an opposite direction. The radially inner impeller can be a high solidity impeller disposed in a preferably-stationary flow shield occupying a portion of a circumference between the inner and outer impellers, and providing a barrier between the material flowing axially in opposite directions while leaving spaces for recirculation of material by radial flow at the ends of the opposite axial flows. The outer impeller can be coupled to the drive shaft by connecting members protruding radially through axial spaces provided in or around the flow shield. Baffles are fixed in the tank and support the flow shield.

Abstract: An apparatus for the combustion of a suspension of a combustible liquid and combustible solids in particle shape, for instance carbon particles, includes a tank, a burner unit and a pipe which is connected to the burner unit and which protrudes into the tank where it is connected to a pump system. The pump system includes an eddy current pump with a branched outlet, where one of the outlet branches is connected to the pipe, while the other branch or branches is formed as a nozzle or a jet with its outlet directed into the tank, thus serving to stir the suspension in the tank.

Abstract: A mixer pump used in a waste tank for mobilizing high-level radioactive liquid waste having a column assembly containing power cables, a motor housing with electric motor means which includes a stator can of a stator assembly and a rotor can of a rotor assembly, and an impeller assembly with an impeller connected to a shaft of the rotor assembly. The column assembly locates the motor housing with the electric motor means adjacent to the impeller which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to lubricate radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the impeller and electric motor means act to grind down large particles in the liquid waste flow. These larger particles are received in slots in the static bearing members of the radial bearing assemblies.

Abstract: The invention is directed to an apparatus for providing absorption of two fluid phases with one another. One of the phases made be a gaseous phase, while the other phase may be a liquid phase.

Abstract: A modular high shear mixer has a shaft guard substantially enclosing the rotating mix shaft thereof and a mixing member guard substantially surrounding the mixing member formed upon the lower end of the mix shaft so as to enhance safety without undesirable affecting the performance of the mixer.. Modular construction facilitates both mechanical and fluid shearing utilizing a plurality of interchangeable mixing members. The mix shaft is driven by a AC motor, the speed of which is determined by a controller so as to eliminate the need for multiple pulleys.

Abstract: A vertical draft tube submerged turbine mixer/aerator includes an impeller rotatedly disposed within the draft tube above an aerator. A single tiplet extends downwardly from the lower surface of each impeller blade in proximity to the blade tip for improving gas to liquid mass transfer efficiency of the mixer/aerator.

Abstract: An agitating apparatus for a digestion tank includes a draft tube having two open ends. The draft tube is fixed in an upright direction in a digestion tank such that one open end thereof is submerged in sludge in the digestion tank. A watertight pipe is mounted in an outer wall of the digestion tank to be just above the draft tube such that the watertight pipe has an axis thereof aligned with an axis of the draft tube. An upper end of the watertight pipe protrudes outside of the outer wall of the digestion tank, a lower portion of the watertight pipe protrudes into an upper space of the digestion tank and a lower end of the watertight pipe is spaced apart from the draft tube. The agitating apparatus also includes a cover removably attached to the upper end of the watertight pipe. A watertight connection connects the draft tube and the watertight pipe to each other. An underwater agitator is inserted through the watertight pipe and is disposed in the draft tube.

Abstract: The mixer includes a cylindrical mixing tube substantially submerged in the liquid asphalt and a paddle assembly extending axially through the mixing tube. An auger drives the ground rubber into an upstream end portion of the mixing tube and into the liquid asphalt therein. The paddle assembly draws the ground rubber and the liquid asphalt from the upstream end portion of the mixing tube and through the mixing tube. In addition, the paddle assembly accelerates the rubber-asphalt mixture as it proceeds through the mixing tube whereupon the mixture is discharged through a downstream end of the mixing tube. The mixing tube is formed with longitudinally spaced openings to allow additional asphalt to enter the mixing tube as the velocity of the mixture increases.

Abstract: Improved mixing effectiveness in the mixing of a gas with a liquid suspension is achieved in a batch mixing system having a mixing tank with a hemi-toroidal tank bottom which extends between a radially inner neck portion of the tank to a radially outer cylindrical wall portion of the tank. The hemi-toroidal profile of the tank bottom has a monotonically increasing toroidal radius between the neck and wall portions. Disposed within the tank is an assembly including an axial flow impeller with pitched impeller blades, a stator adjacent to the impeller and having stationary stator blades of a pitch opposite to the pitch of the impeller blades, a shroud surrounding the radial periphery of both the impeller and the stator and a gas sparging means supported by the shroud.

Abstract: A basket is so disposed that a portion of the outer periphery thereof is faced to the inner peripheral wall on one side of the tank. The starting materials thrown from the hopper portion formed on the other side of the tank which is opposite to the above inner peripheral wall, are efficiently premixed by the secondary vanes that are rotating near the center of the tank under the basket. The grains of the blend are dispersed by the primary vanes that are rotating in the basket 20 and pass through the slits formed by numerous wires having a circular shape in cross section in the side wall of the basket.

Abstract: Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation in aqueous chelated transition metal solution in a modified agitated flotation cell. The same principle may be employed with other procedures in which a gaseous phase is dispersed in a liquid phase to effect an interaction between components present in such phases. A gas-liquid contact apparatus, generally a combined chemical reactor and solid product separation device, comprising such modified agitated flotation cell also is described. In order to effect efficient mass transfer and rapid reaction, gas bubbles containing hydrogen sulfide and oxygen are formed by rotating an impeller at a blade tip velocity of at least about 350 in/sec. to achieve the required shear.

Abstract: A processing vessel (10) for a liquid includes an impeller (32) in an open-ended shroud (30) to cause circulation. The base of the vessel (10) communicates with a short duct (18) closed at its lower end, and the shroud (30) is shaped to ensure circulation into this dead-end duct (18). The duct is provided with ultrasonic modules (24) so that its contents are subjected to intense insonation. The insonation of the liquid can lead to improvements in the product of processes such as crystallization.

Abstract: Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation in aqueous chelated transition metal solution in a modified agitated flotation cell. A gas-liquid contact apparatus, generally a combined chemical reactor and solid product separation device, comprising such modified agitated flotation cell also is described. In order to effect efficient mass transfer and rapid reaction, gas bubbles containing hydrogen sulfide and oxygen are formed by rotating an impeller at a blade tip velocity of at least about 350 in/sec. to achieve the required shear. To assist in the reaction, a surrounding shroud has a plurality of openings, generally of aspect ratio of approximately 1, of equal diameter and arranged in uniform pattern, such as to provide a gas flow therethrough less than about 0.02 lb/min/opening in the shroud.

Abstract: An apparatus has the capacity to satisfactorily blend a liquid with a powder and pump the resultant viscous slurry in a single stage operation. The apparatus has a vertically oriented drive shaft with a bladed impeller attached to the drive shaft. A housing surrounds a mixing chamber in which the impeller is located. The lower end of a powder inlet tube is disposed in very close proximity to the highest vertical extent of the impeller blades. A liquid enters the mixing chamber exterior of the powder inlet tube. The resultant slurry leaves the mixing chamber via a slurry discharge port.

Abstract: A continuous flow mixer includes an impeller assembly and a mixing chamber formed from concentric inner and outer tubes. The inner tube is radially constrained but is movable along the axis of the outer tube. The impeller assembly is at one end of the mixing chamber and draws fluid along the interior of the inner tube and discharges the fluid to the annular region between the inner and outer tubes. The fluids are introduced into the mixing chamber at the end remote from the impeller assembly and the mixed solution exits the mixing chamber substantially centrally of its length from the annular region.

Abstract: A method for treating liquid waste water sludge after its generation and separation from the waste liquid involves forcibly impacting sludge particles and microbial cells against a contact surface to thereby fragment the particles into smaller-sized particles and break apart the organic cells. As a result of such a fragmentation process, water located in the pores of the sludge particles is released, thereby enhancing a subsequent dewatering process performed on the sludge. The destruction of the cells permits a subsequent solids digestion process to work more efficiently, while also permitting a more complete conversion to dissolved sugars, proteins and carbon dioxide.

Abstract: A method and apparatus for fragmenting waste water sludge particles to destroy sludge particles and to enhance a dewatering process performed on the sludge. Sludge is passed through a slotted rotor that centrifugally propels the sludge through slots in a surrounding annular stator. Sludge particles forcibly impact against the side surfaces of the stator slots to fragment into smaller sized particles. During the fragmentation process water located in the pores of the sludge particles is released. The free water can later be separated from the sludge in a dewatering apparatus. When passing through the rotor and stator slots, organic cells are broken apart and a portion of each is converted to dissolved sugars and proteins.

Abstract: A double-suction, submerged pump fitted with an agitator beneath its lower suction inlet is disclosed. The pump intended particularly for use as a slurry pump is driven by an elongated drive shaft by a remote motor. The motor and drive shaft bearings are located in a substantially non-corrosive, non-erosive environment above the body of slurry being pumped.

Abstract: A mixing machine for dispersing finely divided solid particles in a liquid vehicle including an agitator shaft, a rotor stator assembly, a plurality of stator support rods, variable flow restrictor means being associated with the stator portion and a second variable flow restrictor means being associated with the rotor stator assembly.

Abstract: An apparatus for mixing powder and liquid together continuously comprises a housing (1) which has a conical surface (16), and a rotor (7) which is journalled for rotation in the housing and which has a conical surface (9). The housing has provided therein a liquid inlet (20) through which liquid is delivered to a gap between the conical housing and rotor surfaces, and a powder inlet (12) through which powder is delivered to the upper surface (8a) of the rotor. As the rotor rotates, a liquid film is formed on the conical housing surface while, at the same time, powder is thrown onto the liquid film with the aid of rotor-carried guide vanes (10). The mixture is worked and pressed out through an outlet (30) by wing-like elements (11) carried by the rotor.

Abstract: A plain, circular, high speed rotor, completely covering, and spaced apart from, the end of a thin walled stationary cylinder, forms a short narrow high shear gap. The cylindrical chamber allows fluid axially approaching the central rotor surface to be accelerated radially, to higher speeds over most of the plain rotor, to pass directly through the short shear gap near the rotor periphery. The higher speed fluid in the rotor boundary layer entering the gap excludes free stream turbulence from the high shear region. By adjustments of the gap clearance, one unit with an inch diameter stationary cylinder can dissolve, grind, prepare submicron dispersions, emulsify, mix or pump fluid mixtures at more than three gallons per minute. The gap clearance limits the size of particles passing through the gap without grinding and the force opposing gap spreading controls the intensity of grinding. After grinding is completed the elastic gap may close to the adjusted gap clearance.

Abstract: An apparatus for high shear mixing of material comprising a hub having a rotation axis, a flange attached to the hub and extending radially outwardly therefrom, an impeller operatively attached to the hub for rotation therewith and axially spaced from the flange and an annular skirt attached to the flange, the skirt having a plurality of openings spaced around the circumference, an annular chamber being formed by the hub, the flange, the impeller and the skirt, the impeller having blade formations adapted to pump the materials being mixed into the annular chamber and out through the openings as the apparatus is rotated about the rotation axis.

Abstract: A two stage blender is capable of handling high viscosity liquid-powder mixtures. The mixture discharged from the first stage is directed to the second stage, from which it is discharged at a relatively high discharge pressure. The second stage further enhances the natural vacuum created within the first stage, so that powder is fed at a constant ratio for a wide variety of liquid flows. Selected internal parts of the blender are designed to permit cleaning the blender in place.

Abstract: The invention is concerned with a device for the mixing and dispersion of at least two media, the device consisting of a substantially tubular stator (4) with at least one substantially axial inlet (12) and a substantially axial discharge (15) for the media and a rotor (2) with several radially extending rotor blades (5), the rotor being arranged in the stator (4), coaxially to it, between the inlet (12) and the discharge (15). In order that a partial stream of the media, which are at least premixed, be dispersed reliably, the stator (4) has radial openings (16) in the region of the rotor (2).

Abstract: In a cyclone mixer for the continuous mixing of pulverulent substances with liquids, with a charging mechanism for the pulverulent substances and with a mixing chamber positioned below it and into whose upper region issues a tangential suction tube and which is provided in the lower region with a pump impeller and a dispersing apparatus surrounding the same and into whose lower region issues an outlet, it is provided according to the invention that the dispersing apparatus is constructed as a fixed lamellar ring, which is provided with uniformly circumferentially distributed baffle lamellas extending substantially radially outwards and whose inner portions immediately adjacent to the radial outer boundary of the impeller. In the case of an extremely simple construction, this apparatus ensures that despite the oppositely influencing parameters of high dispersion level and high throughput, a qualitatively and quantitatively very high efficiency is achieved.

Abstract: The invention relates to a method of and apparatus for agitating and pumping particulate solids which are settled in and beneath a liquid by rotating a vaned impeller which is attached to a pump such that pressure waves are set up in the liquid and the settled solids, the solids being loosened so as to be pumpable, and the agitator being arranged to impart to its surroundings an axial component of movement towards the pump inlet.

Abstract: A method and apparatus for rapidly dispersing particles of dry, water soluble polymer into water wherein air, water and said polymer particles are introduced to a chamber for thorough contact of the polymer with the water to form a mixture of aqueous polymer dispersion and entrained air. The mixture is immediately subjected to shear forces to separate any agglomerated particles into individual particles, and to prevent further agglomeration.

Abstract: A submersible mixer with a housing, within which housing sits a motor and gear box or other drive means, attached to said housing is a high-efficiency impeller, said housing being supported by vanes which baffle liquid flow when being mixed, and which when said impeller axis is aligned vertically form the base, and which when said impeller axis is aligned horizontally form two points of a tripod.

Abstract: An improved liquid manure agitating and pumping apparatus for alternatively pumping and agitating liquid manure in a manure pit and including a housing having an impeller disposed therewithin and a motor situated on the housing for rotation of the impeller. The housing has an opening for fluidly communicating with the liquid manure in the pit and a discharge outlet. A sliding gate valve has a stationary guide plate with an opening in fluid communication with the discharge outlet and a sliding gate in sliding cooperation with the stationary guide plate. The sliding gate has a discharge pipe for connection with a suitable conduit to discharge the liquid manure out of the pit. A handle assembly is attached to the sliding gate for moving the sliding gate between a pumping position wherein the discharge outlet is in fluid communication with the discharge pipe and an agitating position wherein the discharge outlet is positioned for fluid communication with the manure in the pit.

Abstract: A high-speed fluid blender for liquid fertilizer employs a slurry-type of pump for both mixing and recirculation. The pump has a plurality of parallel spaced-apart blades, each of which comprises a disc having a central circular opening formed therein. One of the discs, such as the top disc, is driven by a shaft powered by a motor. The remaining discs are carried by the driven disc for rotation in unison. The discs are substantially alined coaxially of one another, and the disc assembly is housed within an annular pump housing. The circumferential edges of the discs have a substantial radial clearance with respect to the annular wall of the pump housing. This radial clearance increases in the direction of rotation of the blade assembly towards the discharge opening in the pump housing. A funnel-shaped hollow neck housing is secured to the bottom wall of the pump housing, in communication with the inlet opening therein, and diverges outwardly therefrom.

Abstract: A mixer of the kind having a work head 50 comprising a rotor 60 rotatable within a stator 70 to cause liquid to flow through the stator and having a mixing and shearing effect in the liquid. The mixer has a motor 12 which is vertically movable within a housing 10 between a raised and a lowered position, by means of a handle 30 which rotates a cam 22 engaging the housing 12. The stator 70 is fixed to the housing 12 by rods 52, and the rotor 60 is fixed to the end of the motor shaft 40, so that movement of the motor 12 moves the rotor between raised and lowered positions. In the raised position the rotor has a mixing effect. In the lowered position the rotor is at the same level as an outlet 78 extending from the stator 60, and acts to pump liquid through the outlet.

Abstract: A vertical axis dispersion turbine is of the type which has a stator consisting of a stator tube with a cylindrical guide ring of larger diameter than the tube defining an annular inlet, an axial rotor shaft freely rotatable in the stator tube and having several blades in the guide ring to draw a medium to be mixed and dispersed downwardly through the annular inlet, and dispersion means through which the medium flows. The dispersion means consists of a dispersion element mounted on the guide ring in a plane transverse to the rotor shaft, either immediately above or below the rotor blades, or two dispersion elements above and below the rotor blades. The dispersion elements are axially adjustable, and may consist optionally of radial arms, or a grid with axial openings or a perforated plate with axial passages. The guide ring is slidably adjustable on the stator tube.

Abstract: An apparatus for agitating and pumping a liquid slurry, such as liquid manure slurry. The apparatus includes a pump which is adapted to be positioned within the lower end of a pit that contains the slurry, and the pump is operably connected to a motor which is located above the pit. The motor-pump unit is mounted for sliding vertical movement on a fixed column and can also be rotated horizontally relative to the column to vary the position of the outlet of the pump during agitation of the slurry. The apparatus also includes a means for tilting the motor-pump unit with respect to the fixed column. When the pump is raised to a location adjacent the top of the pit, the motor-pump unit can be tilted in a vertical plane to move the pump out of the pit to a position where it can be repaired or maintained.

Abstract: An apparatus for agitating and transforming settled sludges into slurries which are then capable of being pumped by conventional means. The apparatus comprises a housing immersible in the contents of a tank or chamber and containing separate variable drive means for an impeller and an impeller casing. The impeller casing forms an inlet to the impeller and has a plurality of radially directed outlet nozzles whereby rotation of the impeller effects circulation of the contents of the tank or chamber from the inlet to the outlets and rotation of the casing causes the discharge at the outlets to agitate the contents. The discharge at the outlets breaks up solid sediment at the bottom of the tank or chamber and a continuous recirculation of the contents results in the formation of a slurry.

Abstract: A mixer arranged for crushing food materials immersed in a liquid comprises a motor unit and a mixing foot. A shaft extends within the mixing foot and is coupled at one end to the motor unit. At its other end the shaft carries a mixing screw which is housed in a cover carried by said mixing foot. The mixing screw is movable between a safety position, in which it is located in the cover, and a mixing position, in which it projects outwardly of the cover. The mixing screw is moved into its mixing position against the action of elastic restoring means by a force resulting from the screwing effect in the liquid.

Abstract: A mixing apparatus is provided in which a rotatable impeller is surrounded by a device having radial openings and being in shearing relationship with the impeller so that material urged outwardly through the openings is subjected to a shearing action. A discharge chamber receives material passing through the openings and is thus pressurized so as to discharge material from an outlet of the chamber.

Abstract: Milling apparatus wherein material to be milled is agitated with a charge of particulate material also includes one or more predispersing chambers through which the material to be milled enters the apparatus. The chamber includes pumping means which carry out predispersing work.

Abstract: A device for producing acoustic vibration in a flowing liquid or gaseous medium, whereby a liquid or gaseous medium is continuously circulated and periodically subjected to local compression which is converted into mechanical oscillation and the medium produces acoustic vibration. The proposed device for producing acoustic vibration in a flowing liquid or gaseous medium comprises a rotor and a stator in coaxial arrangement, their side surfaces being provided with at least one row of holes. In the rotor, the number of holes in each row is less than in the stator. The device further includes an oscillator of an elastically deformable material, which encompasses the stator and is arranged in immediate proximity to its side surface, opposite the rows of holes. The device of this invention considerably increase the intensity of acoustic vibration, which makes it possible to speed up production processes and enlarge the volume of media being processed.

Abstract: A flotation cell of the type comprising at least one froth removal edge and a rotor and stator adapted to be immersed in the liquid to be flotated, in order to direct the surface flow in the flotation cell towards its removal edge or edges, the clearance between the rotor and the stator, as seen in the rotation direction of the rotor, widens in that rotational sector or those rotational sectors of the rotor which is or which are substantially towards the removal edge or edges and respectively converges in the other rotation sector or the intermediate rotational sectors of the rotor.

Abstract: In conditioning pulp, such as ore particles carried by or in suspension in water, or other particles, conditioning prior to flotation involves the addition of one or more reagents to the pulp or the like. By this invention, an agitation and pumping zone, spaced from the bottom of the tank in which the operation is carried out, pumps pulp outwardly in swirling, circumferential streams. A conditioning reagent is supplied to the active area of the pumping zone, such as the center of the zone. The operation may be enhanced by using a pair of pumping zones, one above the other, as well as intercepting the streams of pulp radially outwardly of the pumping zones, as by a stabilizer having radially extending vanes.