Abstract: The invention relates to a method and an apparatus for filtering process gas created in the ferroalloy smelting process, i.e. carbon monoxide gas, in order to essentially reduce the content of solids in the gas. In the filtering unit (24) gas containing solids is conducted through at least one filtering element (7), inert gas blowing (8) is directed to the filtering element (7) in order to detach the solid material from the surface of the filtering element (7), and in order to remove from the filtering unit (24) the solid material detached from the the surface of the filtering element (7) the solid material is slurried by means of liquid fed (11) into the filtering unit (24). The slurry containing the sold material is removed from the filtering unit (24) through a discharge chamber (12).

Abstract: The invention relates to a device for supporting a conveyor belt used in the continuously operated thermal treatment, i.e. sintering, of a material bed. According to the invention, in the top part of the frame structure of the belt conveyor, there is installed at least one support element, whereby an essentially smooth slide surface can be obtained for the conveyor belt, and in the interior of the support element there is made a channel system in order to enable the flow-through of the intermediate agent fed into the support element.

Abstract: The invention relates to an apparatus for controlling a conveyor belt used in the continuously operated thermal treatment of a material bed, i.e. in continuously operated sintering, where the conveyor belt can be made to operate between a transmission drum and a bending drum. According to the invention, in order to control the conveyor belt (4, 23), at least on the portion proceeding from the transmission drum (2) to the bending drum (3, 22), to the conveyor arrangement there is connected at least one alignment element (9, 25), which is further connected to at least one roller (11, 27) guiding the conveyor belt (4, 23) in order to move the roller (11, 27) at least in the direction of the plane defined by the conveyor belt (4, 23).

Abstract: A conveyor belt for a continuously operated conveyor-type thermal treatment of a material bed includes metal conveyor belt elements that are connected to each other. Each conveyor belt element is formed with perforations in order to allow gas to flow through the conveyor belt. The perforations are distributed non-uniformly over the conveyor belt element and are located in at least two perforation zones. The perforation zones are separated from each other by perforation-free zones.

Abstract: The invention relates to a device for supporting a conveyor belt used in the continuously operated thermal treatment, i.e. sintering, of a material bed. According to the invention, in the top part of the frame structure (17) of the belt conveyor (14), there is installed at least one support element (1, 18), whereby an essentially smooth slide surface can be obtained for the conveyor belt (11), and in the interior of the support element (1, 18) there is made a channel system (8) in order to enable the flow-through of the intermediate agent fed into the support element.

Abstract: The invention relates to a conveyor belt to be used in a continuously operated conveyor-type thermal treatment, i.e. sintering, of a material bed. The conveyor belt is provided with perforations in order to allow the gases that are used for heating and possibly cooling the material bed to flow through the material bed and the conveyor belt. According to the invention, the conveyor belt is made of a perforated, at least one-part element made of a metal piece and allowing the gases to flow through said element being mechanically connected to the preceding and successive element in the proceeding direction of the conveyor belt by means of a junction made in the lateral direction of said conveyor belt, and the perforations are arranged in zones alternating with perforation-free element pats.

Abstract: The invention relates to an apparatus for processing lumpy, essentially spherical material such as pellets, so that the lumpy material can be applied on a surface that is set in an essentially continuous motion, as an advantageous layer for the further processing of said material, said apparatus comprising means (1) for conveying the material and for feeding the material onto a surface (15) that is set in an essentially continuous motion. According to the invention, the conveyor (1) is installed movably in an alternating motion between two positions (3, 4) in order to feed the material conveyed by the conveyor (1) as a layer (16) that is advantageous both in thickness and in cross-section onto a surface (15) set in an essentially continuous motion.

Abstract: The invention relates to an apparatus for processing lumpy, essentially spherical material such as pellets, so that the lumpy material can be applied on a surface that is set in an essentially continuous motion, as an advantageous layer for the further processing of said material, said apparatus comprising means (1) for conveying the material and for feeding the material onto a surface (15) that is set in an essentially continuous motion. According to the invention, the conveyor (1) is installed movably in an alternating motion between two positions (3, 4) in order to feed the material conveyed by the conveyor (1) as a layer (16) that is advantageous both in thickness and in cross-section onto a surface (15) set in an essentially continuous motion.

Abstract: The invention relates to a roller screen for screening pellets for sintering, the roller screen including several successive rotating rollers that are spaced apart and arranged transversally in relation to the proceeding direction of the material. The roller screen is provided with separate rotation motors for rotating each of the rollers and an adjusting member for adjusting the mutual position of the rollers in order to screen a desired particle size. The screen path of the roller screen is composed of three successive screening parts, which are mutually connected so that the rollers of the screening parts are made to rotate in relation to each other, and the speed of rotation of the roller increases in the proceeding direction of the material towards the final end of the roller screen.

Abstract: A method and device for clamping the electrode contact shoes (2) around the electrode (1) of an electric furnace, comprising one pressure element (3) which is advantageously hydraulically operated and uniform and which surrounds the electrode contact shoes and clamps them against the electrode (1) under the action of pressure on the pressure element.

Abstract: Electric furnace dome that is made especially of ceramic material and which has the necessary openings for at least electrodes and material feed, at which time the dome's center (2) inside of the tube systems (3) is cooled at least around the openings with the aid of spiral tube systems (5,7,8,9) whose tube systems (3,5,7,8,9) form a part of the dome's support system.