Abstract: The invention relates to a process for beating pulps between two beating surfaces. In particular, the invention includes the differential speed of the beating surfaces being in the region of −5 m/s and +12 m/s, where it is an advantage if the differential speed is virtually zero. The invention also relates to a device for implementing the process. The device may include rolls, which are provided as beating elements.

Abstract: The invention relates to a process for aerating suspensions, particularly to flotate them, for example in deinking of pulp suspensions, with one or more stages and/or cells P1, P2, P3, P4, S1, S2, where each stage/cell P1, P2, P3, P4, S1, S2 has its own separate liquid loop 6. In order to improve ash removal, the invention provides for a washing process 12, 12′, 16, 18 being interposed. In addition, the invention relates to a device for implementing the process.

Abstract: A method for controlling operation of a flotation cell, where the liquid level and the foam level in the cell are measured and controlled. The method includes measuring at least one quality characteristic of the accept leaving the cell and determining the set value(s) for the liquid level and/or the foam level on the basis of the measured quality characteristic. The method is particularly suitable for flotation of a pulp suspension, particularly in deinking flotation.

Abstract: A screening or filtration device for multi-phase mixtures, particularly liquids containing fibers, includes a casing with at least one feed pipe, at least one filtrate discharge pipe, at least one retentate discharge pipe, and at least one filter or screen through which the filtrate flows. The filter or screen being formed at least by an essentially rigid top surface of an at least essentially circular filter disc with hollow interior that can be rotated round an essentially central axis, where the interior of the disc is connected to the filtrate discharge pipe. The device also comprising at least one structural element adjacent to the filter or screen, where guiding and drive facilities are also provided that cause this structural element and the filter disc to describe movement relative to one another parallel to the level of the filter disc.

Abstract: A screen, for cleaning a fiber suspension, includes at least one separating unit containing a housing, a parabolic rotor, a screen basket, an accept chamber, and a reject outlet. The reject outlet is located in the vicinity of the maximum rotor diameter. The screen also includes at least one feed for dilution water located in the vicinity of the reject outlet, particularly directly below it.

Abstract: A screen, for cleaning a fiber suspension, includes at least one separating unit containing a housing, a parabolic rotor, a screen basket, an accept chamber, and a reject outlet. The reject outlet is located in the vicinity of the maximum rotor diameter. The screen also includes one or several devices for interrupting the axial flow located in the vicinity of the maximum rotor diameter.

Abstract: Apparatus and a process for separating impurities from a suspension in a flotation cell, including an aeration device for aerating a liquid with a gas until the liquid is saturated. An expansion device expands the liquid saturated with gas to form gas bubbles in the liquid. An addition device adds the liquid containing gas bubbles to the suspension in the flotation cell.

Abstract: A filter or screen for a membrane filter. The filter or screening discs being mounted on a hollow shaft made up of several shaft elements.

Abstract: A filter/screening disc for membrane filtration includes a base structure connected to a hollow shaft and to which screening/filter elements are secured. The filter/screening disc is made up of two halves.

Abstract: A screen for cleaning a pulp suspension including an additional screen basket in the infeed area for pre-screening.

Abstract: The invention relates to a device for separating solids from liquids by means of flotation, particularly for separating impurities and ink particles from fibre suspensions, with several injectors 10, which are provided inside a flotation cell 1. It is mainly characterised by the injectors 10 being arranged in one row.

Abstract: A refiner including a rotor and a stator defining a cylindrical or conical refining gap therebetween. A pulp feed channel extends in a radial direction from an inlet pipe to the refining gap.

Abstract: A screen for cleaning a pulp suspension includes a stationary installation in the infeed area between the infeed branch and the free end of the rotor.

Abstract: A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.

Abstract: A screen, for screening material used in the production of paper, board and the like, having a screen basket and a rotor supporting several blades which can be moved along the wall of the screen basket when the rotor rotates. The blades having a convex curvature on the side facing the screen basket. The radial clearance between the surface of the blade facing the screen and the screen being lowest between the front sector, viewed in the direction of rotation, and increasing towards the rear edge of the blade.

Abstract: A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.

Abstract: A refiner for shredding pulps having refining surfaces provided on a rotor and a stator and which form a cylindrical or a conical refining gap. The refining gap is set by wedges which are mounted on the stator and rotor and can be moved against each other.

Abstract: Apparatus and process for aerating a liquid with gas, the apparatus comprising a pressure vessel including a lower section containing the liquid and an upper section containing a volume of the gas. A pressure connection in the upper section of the pressure vessel adapted receives the gas. A nozzle in the upper section of the pressure vessel receives the liquid. An injector extends from the upper section of the pressure vessel to the lower section of the pressure vessel and has a head in fluid communication with the nozzle. Part of the gas volume is sucked in by the vacuum generated by the liquid injected, carried along together with the liquid and mixed intimately with the liquid at the same time.

Abstract: Apparatus and a process for separating impurities from a suspension in a flotation cell, including an aeration device for aerating a liquid with a gas until the liquid is saturated. An expansion device expands the liquid saturated with gas to form gas bubbles in the liquid. An addition device adds the liquid containing gas bubbles to the suspension in the flotation cell.

Abstract: A screen for cleaning a pulp suspension including a cylindrical screen basket and a double-conical accept chamber which widens in the flow direction of the pulp suspension.