Abstract: The invention relates to a method and device for the washing of a medium consistency fibrous slurry, especially a chemical pulp slurry in which the slurry is fed at an inclined angle onto a substantially horizontal portion of circulating filter belt, and then distributed over substantially the entire working width of the filter belt. The distributed slurry is then washed with a washing liquid under localized pressure to produce a slurry having a medium consistency range, i.e., about 8 to 15 percent. In order to increase the consistency to 20 to 40 weight percent, preferably about 30 to about 35 weight percent, the washed slurry is passed to a pressing zone.

Abstract: A process for the comminution, in particular defibrillation, and reaction of fibrous materials having a high dry solids content with the addition of a circulating medium, preferably a carrier gas and/or reaction agent, as well as optionally of chemicals. The invention is mainly characterized in that the circulating medium is recycled after leaving the comminuting device, by changing its temperature, and is then recycled to the comminuting device. Another embodiment of the invention is characterized in that the fibrous materials and liquid reaction agent are separated from the carrier gas and reaction agent vapors, which are then recycled back to comminuting device. A plant for carrying out this process is mainly characterized in that the comminuting device and route for recycling and treatment of the circulating medium form a closed system.

Abstract: The invention relates to an apparatus, in particular a machine, for the pressing and dewatering or filtering of sludges, fibrous material suspensions or cellulosic material suspensions, having two circulating filter belts or screen belts between which the material to be pressed, dewatered or filtered is made to pass, and two circulating pressure belts or supporting belts for supporting said two filter belts on their sides facing away from the material to be treated, with supporting or pressure means, in particular stationary during the operation of the apparatus, for the pressure or supporting belts on their sides facing away from the filter belts or the material to be treated.

Abstract: A device for transport of material between chambers at different pressures, comprises a feed chamber, a main chamber having an upper housing with an inlet and a lower housing with an outlet. The feed chamber is coupled to the main chamber at the inlet, and a first slide valve opens and closes the inlet. A second slide valve for opening land closing the outlet may be provided. At least one hollow gasket with an essentially closed wall, preferably an inflatable gasket, is provided between the upper housing and the first slide valve for sealing the inlet; and, at least one gasket with an essentially closed wall, preferably an inflatable gasket, may be provided between the lower housing and the second slide valve for sealing the outlet. Alternatively, a first flap valve for opening and closing the inlet is provided which is pivotally coupled to the upper housing at one side.

Abstract: A conveyor belt has edges with longitudinally extending profiles formed as grooves or elevations for sealing and guiding. A process for producing belts with profiled edges uses a cutting device and profiled molds to form profiles in the belt and its edge while the belt is guided and supported by rolls.

Abstract: During the pickling, etching, chemical shaping etc. of steels, stainless steels, special alloys and special metals and the dissolution of those metals, metalliferous solutions of the acids employed arise in the course of such processes which must either be disposed of by neutralization or be used for the recovery of the acids and metals by expensive processes. According to the invention the production or recovery of nitric acid or a mixture of nitric acid and hydrofluoric acid takes place by spray-roasting the solutions at temperatures of 200.degree. to 500.degree. in a reactor (1) and subsequent absorptions or condensation of the gases generated in column means (7, 8) at temperatures of 0.degree. to 70.degree. C.

Abstract: The invention relates to a segment for drum refiners provided with comminuting, in particular grinding surfaces with a projection of hammerhead-shaped cross section for anchoring on the rotor or rotor drum shell. The invention is characterized mainly in that the segment (2') of T-shaped cross section consists of a slim stem (2") and a slim flange (2"') and that the transition surfaces from stem to hammerhead (12) viewed in cross section form an angle (.beta.) of between 15 and 75 degrees, preferably of about 55 degrees, open towards the hammerhead and conveniently equal on both sides with the axis of symmetry (8) of the hammerhead of symmetrical cross section. The ratio of the stem thickness (D) to the segment height (H) conveniently amounts to between 1:5 and 1:9, preferably about 1:7, and the flange thickness (FD) on the stem is about equal to the thickness of the stem.

Abstract: A double screen belt press for dewatering mixtures of fibrous material suspensions has a wedge compression zone comprising rolls and perforated plates supporting generally upper and lower screen belts. For dewatering mixtures of fibrous material suspensions having a high dry solids content, at least one sealed material feed empties into the wedge compression zone with a high pressure. A generally vertically gravity tower with an outlet port is provided to feed material into the entrance of the wedge compression zone above the lower screen belt and in front of the front roll supporting the upper screen belt. The outlet port area of the material feed is sealed on at least the side facing the lower screen belt and optionally on the side facing the upper screen belt and on the other side of the material feed facing away from the wedge compression zone between the material feed and the lower screen belt.

Abstract: The invention relates to apparatus for the dewatering of a web of cellulosic matter or a web of material for the pasteboard or cardboard production, having endless screen belts or the like circulating in opposite directions between which the web is made to pass for dewatering, the web being made to pass through at least one first dewatering zone with at least two screen belts or the like and thereupon to at least one further dewatering zone, in particular a compresion zone, with at least two screen belts.

Abstract: A process and apparatus for continuously purifying gases by removing entrained burdening substances therefrom, wherein the gas is loaded with entrained substances is passed substantially radially through adsorbing material arranged about an axis of rotation as an adsorber bed, the substances being retained on the adsorbing materials in the course of their rotational movement about the axis of rotation, and in the course of further rotational movement the load of retained substances is desorbed, optionally after inertization, by flushing with a fluid medium, e.g., hot gases or steam, and the adsorbing material may then be cooled and/or dried. Rotational movement is preferably done intermittently, and the feed stream to and the drain stream from the adsorbing material each are conducted through a confined space extending at least in one direction substantially parallelly to the axis of rotation or to the adsorber bed, the confined space being fed and drained axially.

Abstract: An improved method for producing aluminum titanate powder material for making aluminum titanate ceramics.

Abstract: The invention relates to processes for the treatment of in particular medium and highly consistent material-gas mixtures to be pumped, preferably gas-containing, in particular air-containing fibrous material suspensions, a separation of the gas being effected prior to the pumping operation. The invention is mainly characterized in that the material-gas mixture, preferably the gas-containing fibrous material suspension, is subjected in a separate container separate from the pump housing for the separate gas separation, in particular air separation, preceding the pumping operation, to a conveniently high-speed rotation of in particular between 1,200 and 3,400 rpm, preferably of about 3,000 rpm, while at least in operation, gas, in particular air, is sucked off or a vacuum is generated approximately in the center of the rotating motion of the material-gas mixture. The invention further relates to plants and devices e.g. suitable for carrying out these processes.

Abstract: In a process for the manufacture of a metal foil, the metal foil is deposited electrolytically on an endless carrier belt, preferably an endless metal belt, in one or more cells, the current density being set to different levels in the plurality of cells and/or within each individual cell. A post treatment of the metal foil manufactured takes place wholly or at least in part on the endless carrier belt, thereby metal foils, respectively metal composite foils can be manufactured at favorable cost and with low labor input.

Abstract: The invention relates to a process for the guiding, positioning and motion control of bands of material and a set of guide rolls for carrying out the invention. A pivotal frame rotatable and pivotal about an imaginary vertical axis with regard to a stationary basic frame by means of a pivotal cylinder is supported on said stationary basic frame. On the pivotal frame, two lower rolls with horizontal axes are spacially supported. An upper roll with horizontal axis rotatably supported on a superposed frame is descendable into said space. The superposed frame is articulated to the pivotal frame on one end by means of uprights and on the other end by means of contact pressure cylinders. It is the object of the invention to use said set of guide rolls also as a set of driving or braking rolls in order to achieve an effective guidance and control of the band also during the entrance and exiting stage.

Abstract: Apparatus for the surface treatment of strips with liquid, in particular for the pickling of rolled metal strip. The apparatus comprises a pickling vessel (3), through which the strip (10) is advanced, closed by a cover (4). Between the strip (10) and the cover (4) a means is provided which if the strip rises upwards, guides the latter back into the direction of movement. This means can be formed of profiles providing a sawtooth-like configuration. Such profiles may be formed by guide means (11) which are chamfered on the side from which the strip enters.

Abstract: The invention relates to an apparatus for the treatment of a material, in particular a web of material or pulp, made to pass between at least two endless permeable belts, in particular screen belts or the like conveying means, in particular for the displacement washing of a filter cake or for washing fibrous matter, the material being passed between the belts along at least one, in particular at least two containers serving for the supply or discharge of a treatment medium. The object is in particular to reduce the construction length of such apparatus and to bring about a particular increase of the washing effect or other treatment effect, and this if possible without applying a vacuum.

Abstract: The invention relates to an apparatus or device for the treatment of a material, in particular a web of material or pulp, made to pass between at least two endless permeable belts, for instance screen belts or the like conveying means, preferably for the displacement washing of a filter cake or for washing fibrous matter, the material being passed between the belts along at least two containers serving for the supply of a treatment medium, for instance a washing fluid, a bleaching agent or other chemicals. It is the object of the invention to provide a compact apparatus of this type at simultaneous good effectiveness.

Abstract: The invention relates to a filter belt press for separating solid matter from material suspensions, in particular fibrous material suspensions, in which the filter belts are guided through a wedge-shaped dehydrating zone in which the filter belts are supported at least over portions by wedge-like converging filter plates. For an optimation of the pressing effect, it is provided that the filter belts (3,4) be guided from this first dehydrating zone (1), in which the filter plates (5) are optionally supported by dehydrating boxes (6) or provided with dehydrating boxes (6) on their outsides, into a surface press (2) or surface pressure means for the material (29) or filter cake present between the filter belts (3,4), the press (2) in particular being immediately adjacent the end of the wedge-shaped dehydrating zone (1).

Abstract: In a process for the purification of waste gases containing hydrochloric acid and sulphur dioxide obtained from incinerating plant, in particular refuse incinerating plant, hydrochloric acid and gypsum are to be recovered. For that purpose a magnesium hydroxide suspension is used as a regenerable scrubbing agent, resulting in the production of a readily filtrable coarsely particulate calcium sulphate from the sulphate content by precipitation with calcium ions and in hydrochloric acid of 16-30 mass % up to maximum purity by the pyrohydrolysis of the chloride content. The magnesium oxide which is formed is returned to the waste gas scrubber after hydrating.

Abstract: A process for the comminution, in particular defibrillation, and reaction of fibrous materials having a high dry solids content with the addition of a circulating medium, preferably a carrier gas and/or reaction agent, as well as optionally of chemicals. The invention is mainly characterized in that the circulating medium is recycled after leaving the comminuting device, by changing its temperature, and is then recycled to the comminuting device. Another embodiment of the invention is characterized in that the fibrous materials and liquid reaction agent are separated from the carrier gas and reaction agent vapors, which are then recycled back to comminuting device. A plant for carrying out this process is mainly characterized in that the comminuting device and route for recycling and treatment of the circulating medium form a closed system.