In a papermaking process foreign bodies are removed from an aqueous suspension (S) of fiber by floatation in a tank (4). Foreign bodies are raised by rising air bubbles (1) forming a floating block of surface foam. Foam is deflected by vanes into open-topped gutters (5), where it thickens and deposits foreign particles. Foam is recovered as black water (13) with particles and subsequently processed. Also claimed is a commensurate assembly with upper (foam) and lower (suspension) sections having a progressive transition between the liquid suspension and the mass of overhead bubbles. The tank upper section has two or more lines of drainage gutters at different levels, each gutter having sideways-projecting vanes which promote the breakdown of bubbles, trapping particles and concentrated dirty water (13). The gap (a) between adjacent gutters is no greater than twice the width (b) of a gutter.

Method and device for removing contaminants by flotation from an aqueous fibrous suspension

A reactor formed within a honeycomb monolith is disclosed, the monolith having a plurality of parallel cells and comprising one or more process fluid paths lying within closed cells of the monolith and extending laterally from cell to cell, the monolith having porous walls that are coated with a non-porous coating in at least a first zone along the one or more process fluid paths and that remain porous in at least a second zone along the one or more process fluid paths, the porous walls in the second zone adapted to allow permeate in a respective process fluid path to pass through the porous walls. A method of forming a reactor in a honeycomb monolith is also disclosed, including providing a porous honeycomb monolith having cells extending in a common direction divided by cell walls, forming a process fluid path within closed cells of the monolith extending laterally from cell to cell, coating the cell walls of the monolith within at least a first zone along the process fluid path within the monolith with a non-porous coating, and allowing the at least some cell walls of the monolith within a second zone along the process fluid path to remain porous.

Zoned monolithic reactor and associated methods

A device is provided for filtering particles from a dishwashing fluid in a dishwashing machine, the dishwashing machine having a dishwashing container in which are disposed items to be subjected to the application of a dishwashing liquid thereto such that particles disentrained from the items during the application of a dishwashing liquid are entrained with the dishwashing liquid. The device includes a container operable to retain therein a predetermined quantity of a liquid mixed with at least one of a foam-forming substance and cleaning agents, the container including an arrangement for producing a flow of a gaseous fluid through the predetermined quantity of the liquid so as to generate a foam layer. The foam layer filters out from a dishwashing liquid passed through the foam layer a substantial fraction of particles entrained with the dishwashing liquid and such filtered-out particles are retained in the foam layer.

Device and Method for Filtering Particles from a Liquid in a Dishwasher

According to the present invention, a coated steel stranded cable comprises a plurality of strands, and one central strand, and a plurality of lateral strands stranded on an outside of the central strand. The central strand and the plurality of strands include, in weight %: 0.9~1.2% of C, 0.4~0.7% of Mn, 1.0~1.5% of Si, 0.4~0.7% of Cr, less than 0.01% of P, less than 0.01% of S, and a residual amount of Fe and other inevitable impurities.

Coated steel stranded cable, and method for manufacturing same

The invention relates to a method for forming and handling a fiber suspension suitable for producing cardboard or packaging paper The fiber suspension is at least partly guided from a dissolving stage (3) to a dewatering stage (10, 11, 12, 15) via multiple handling stages The fiber suspension handling complexity is to be reduced in that the material density of the fiber suspension equals at least 3% between the outlet of the dissolving stage (3) and the inlet of the dewatering stage (10, 11, 12, 15)

Method for forming and handling a fiber suspension

To separate and remove foreign matter from a watery fiber suspension (S), the suspension is fed to a foam (2) formed in a liquid by gas bubbles (1). The suspension (S) is moved into the liquid against the direction of the rising gas bubbles (1) in at least one channel (3), in a counterflow movement. The fiber suspension (S) transfers foreign matter to the foam (2), to be taken off as a cleaned fiber suspension (S'). A flow system increases the exchange of matter in the channel (3). The foreign matter is removed together with the flotation foam (2). The flow system is a consistent turbulence in the channel (3). The flow system prevents the foreign matter trapped in the flotation foam (2) from escaping back into the fiber suspension (S). The channel (3) is vertical, and has inner flow guide units, extending vertically over part of the channel (3) cross section as star-shaped guides (4), concentric rings or a honeycomb structure. The flow guides can also be floating bodies in the fiber suspension (S). A number of stirrers at different levels, and rotating in different directions, can also be fitted to give the flow actions. The flow guide system can also be horizontal units with a labyrinth path or openings, or a sieve base, or inserts in the channel (3) which contract and expand the channel cross section. The flow system extracts part of the fiber suspension (S) from the channel (3) and returns it at a lower point. The fiber suspension (S) is fed into the foam (2) in the channel (3) through a gutter with openings, with a controlled suspension level in the gutter. Or the suspension is passed in through a perforated base or a jet base with floating valves. The suspension can also be fed in through a double base, or over a base with a controlled level through the base opening widths. The suspension can be fed in over a base with integrated aeration. The suspension feed can be a rotating gutter, or through a labyrinth with a number of entry points, or over a section with floating bodies.. The suspension (S) can also be fed to the channel flotation foam (2) over a braided metal structure. The suspension can also dribble in a film over a weir, and the like, with concentric ring guides for the film with projections where the film runs off. The suspension (S) can also be fed into the flotation foam (2) by jets with solid or hollow cones, forming free streams aligned upwards. The jets can be ladle jets. The jet openings can be varied, using a rubber with slits which can distort. The jets have beating surfaces, to be struck by the suspension stream and be dispersed, and the beating surfaces can rotate. The jets can be spiral or multi-phase jets. The suspension (S) stream has a rotating flow as it enters the flotation foam (2). The gas bubbles (1) are formed at the bottom of the channel (3). An aeration circuit (11) is formed to take part of the suspension (S'), to be mixed with gas (G) and returned as an aerated suspension (S) at a higher or lower point in the channel (3), or at the same level. The aerated suspension (S) is returned into the channel (3) at a tangent. The extracted suspension (S') is aerated in a stepped diffuser or a venturi jet which gives the suspension flow a twist. The aeration can also be through a two-phase jet unit. The suspension can be gassed through a porous unit, a membrane, a multi-injector base or a rotating aeration system. The gas bubbles initially dissolve air into the fiber suspension so that, on return into the flotation vessel the pressure drop releases the air as bubbles. The gas flows through a spherical packing to form bubbles in the fiber suspension (S).

Method for removing impurities from an aqueous fibre suspension

Method and flotation vessel for removing contaminants from aqueous fibrous suspension. The method includes damming up fibrous suspension at a head level above a bottom of flotation vessel, and forming a bubble flow via gas bubbles rising counter to gravity in dammed fibrous suspension, such that fibrous suspension is carried counter to ascending direction of bubble flow and contaminants are deposited on gas bubbles. Accepts, discharged in cleaned form, are carried counter to bubble flow, and contaminants and bubbles are discharged in thickened flotation foam. A flow cross-section of flotation vessel transverse to bubble flow is formed straight on at least 80% of at least one side wall, and length of side wall is at least 1.5 times greater than width of end wall. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Method and device for the flotation of contaminants from an aqueous fibrous suspension

In a paper recycling process, ink and other impurities are removed by selective floatation in a series of linked modular upright chambers (4) in which there is a downward flow of liquid fibre suspension intermingled with an upward flow of bubbles. The chambers are of rectangular cross section. The length L of each chamber is at least 1.5 times the width (B). The flow-path hydraulic cross sectional diameter is not greater than 2.7 m. The incoming suspended matter is distributed over at least 80 % of the module cross-sectional area as seen in planform. Also claimed is a commensurate assembly.

Process and apparatus for removing contaminants by flotation from an aqueous fibrous suspension

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Method for removing impurities from an aqueous fibre suspension

Method and device for the flotation of contaminants from an aqueous fibrous suspension

Process and apparatus for removing contaminants by flotation from an aqueous fibrous suspension