Abstract: The present invention relates to a method for preventing material to be briquetted from sticking to a roll surface of a briquetting roll press. To be more specific, a sticking of the material to be briquetted to and a sintering of the material on the roll surface are to be prevented. To this end, a lubricant emulsion which is atomized with a gas is sprayed onto the roll surface.

Abstract: The invention relates to a roll press, in particular for processing very abrasive materials, comprising at least two press rolls of which each includes a wear layer arranged on a basic body. The wear layer comprises substantially plane zones of a highly wear-resistant material while the spaces between the highly wear-resistant zones are filled with a material of different wear resistance. Furthermore, the material for the spaces is a composite material which is adapted to be sintered, and the highly wear-resistant zones are formed from hard bodies produced by hot-isostatic pressing. The material for the spaces and the material for the wear-resistant zones are bonded to the basic body in a hot-isostatic pressing process. The wear resistance of the composite material is substantially slightly greater or smaller than the wear resistance of the hard bodies in accordance with a desired profile which will obtained through wear.

Abstract: A method of producing briquettes for use in steelmaking processes in a melting vessel. Prior to the briquetting step, the residues should have added thereto essentially uniformly distributed carbon carriers, the amount of carbon carriers added corresponding precisely to the amount required for causing an essentially complete reduction of the iron-oxide containing residues. The residues obtained as byproducts in a smelting plant can thus be reused to a high degree by adding them to a steelmaking process. A residue briquette can be supplied to the melting vessel in an amount of up to 30%. This permits the use of residues instead of scrap.

Abstract: The invention relates to a roll press, in particular for processing very abrasive materials, comprising at least two press rolls of which each includes a wear layer arranged on a basic body. The wear layer comprises substantially plane zones of a highly wear-resistant material while the spaces between the highly wear-resistant zones are filled with a material of different wear resistance. Furthermore, the material for the spaces is a composite material which is adapted to be sintered, and the highly wear-resistant zones are formed from hard bodies produced by hot-isostatic pressing. The material for the spaces and the material for the wear-resistant zones are bonded to the basic body in a hot-isostatic pressing process. The wear resistance of the composite material is substantially slightly greater or smaller than the wear resistance of the hard bodies in accordance with a desired profile which will obtained through wear.

Abstract: The present invention relates to a method for making sponge iron briquettes from fine ore with a maximum grain size of less than 2 mm, preferably less than 0.5 mm, wherein hot fine ore is fed to a roller press comprising two press rolls and is briquetted by opposite briquette pockets of the press rolls in the nip to form sponge iron briquettes. The direct pressing of fine ore into sponge iron briquettes has largely been unknown in the prior art. The invention proposes that one of the press rolls be operated as a loose roll which is substantially movable in a direction transverse to the roller axis, the nip adapting to the amount of material supplied to the press rolls and the nip substantially having such a mean width that a briquette strip is produced. In comparison with a former method, the method of the invention achieves a markedly increased service life of the molding bodies which are provided with press pockets.

Abstract: The present invention relates to a method for making sponge iron briquettes from fine ore with a maximum grain size of less than 2 mm, preferably less than 0.5 mm, wherein hot fine ore is fed to a roller press and is briquetted by the roller press to form sponge iron briquettes. Apart from briquettes, fine ore which is compacted in the spaces of briquette pockets of the roller press, as well as fines in dust form are produced during briquetting. These components are designated as returns and separated from the sponge iron briquettes. The returns are then fed to the fine ferrous ore prior to briquetting. The processing of fine ore has so far entailed great problems in the technical field. The invention suggests that the returns be directly fed to a conveyor system after having been separated from the sponge iron briquettes and that the returns which are still hot be fed by the conveyor system substantially evenly and continuously to the hot fine ore to be still briquetted.

Abstract: An apparatus for hot-briquetting iron sponge includes a gravity feeder which has a feed shaft and a regulating tongue which supplies material in a dosed quantity to a moulding gap of a roller press, in such a way that the apparatus can also be used for pressing hot iron sponge at temperatures of up to 1000.degree. C. for obtaining high-density briquettes of good quality. The regulating tongue is provided with a heat-reducing insulating layer and cooling system. The feed shaft and a feed hopper also may have a heat-insulation layer and a cooling system. A flow-rate control is provided for gravity feeders where bulk material or flowable material is supplied by at least one regulator through a feed shaft to a moulding gap formed between at least two rolls and is processed by the rolls. At least one of the rolls is motor-driven. The material is supplied to the moulding gap by the regulating tongue in response to a driven roll torque sensed by a torque detector.

Abstract: Sponge iron particles obtained in a reduction unit are, subsequently, subjected to a hot-briquetting process and supplied to the refining vessel in a condition in which they are still hot from the hot-briquetting process. By means of this measure, the amount of energy consumed in the steel making process is reduced. The transport of the sponge iron briquettes from the hot-briquetting unit to the refining vessel can preferably be carried out in heat-insulated buckets. Possible heat losses which may perhaps still occur can be compensated for by a preheater preceding the refining vessel. For this purpose, the hot sponge iron briquettes are filled into the preheater, where they will then be heated by the hot waste gases originating from the refining vessel. In addition, this process offers a solution for the smooth transition from the continuous production of sponge iron briquettes to the discontinuous refining process.

Abstract: Roll press or mill with two adjacent rolls (2, 4) with cooperating compression surfaces, mounted in bearing housings located between an upper and lower box girder, one roll being adjustable, with a material feed system with at least one fill chamber (6) with walls (22, 24) parallel to the roll axes and extending into the roll gap (8) and with apparatus to eliminate the air entering the roll gap with the material, provided with air admission holes in the region of the roll gap leading into an air collection chamber connected with air outlets. On each side of the fill chamber walls, parallel to the axes, chambers (16, 18) extend essentially over the breadth of the compression surfaces of the rolls and are closed at their ends. The chambers are each connected to the roll gap by a passage (28, 30) formed between the compression surfaces at the perimeter of the rolls and the lower end of the walls adjacent to the walls of the filling chamber. The chambers (16, 18) are provided with air outlets (34, 36).

Abstract: The invention relates to an iron sponge briquetting press having two opposite rollers. The rollers consist of a roller base body and a coating affixed thereto, in which the moulding recesses for shaping the briquettes are formed. In order to provide less expensive roller coatings as compared with the segments used formerly as coating, which have moreover longer service lives, the invention provides that the coating is produced as a closed ring from a chromium nickel molybdenum steel and is held in press fit on the roller base body. Open grooves are produced in the sleeve surface of the roller base body or on the inner side of the ring as cooling ducts, their open sides being covered by the inner side of the ring or the sleeve surface of the base body in the assembled condition of the rollers.

Abstract: A roller press for compacting fine-grained chemicals, especially salts, into sheets, having synchronously driven rollers with two axially spaced pressing surfaces on ring elements being provided with radial shoulders at both of their ends. Screw feeders for feeding the salt into the roll nip and wedge-shaped wall elements closing-off the roll nip in the axial direction on both ends of said ring elements and bearing against the shoulders, are also provided. Adjustment rods acting parallel to the roll axis are provided for the outer wall elements and vertical rods between the inner wall elements acting onto these wall elements via wedge-shaped surfaces arranged on said rods and the walls of said wall elements facing each other. The ring elements are integral with the roller bodies or separate cylindrical rings shrink-fit onto the roller bodies. Each ring element is associated with at least two screw feeders.

Abstract: A multiple injection mould for the manufacture of preforms for the manufacture of flasks by the blast or blow moulding method, the mould having a plate fixed on the nozzle side of the injection moulding machine on which outer moulds are mounted, a core-carrying plate and the fixed plate movable within the injection moulding apparatus machine and an intermediate plate which is movable relative to the core-carrying plate and on which are arranged pairs of mould end plates each having an internal contour by which the external contour of the socket of the neck of each flask is moulded. Driving means are provided for the intermediate plate by which it can be adjusted relative to the core-carrying plate during the opening movement of the latter.

Abstract: Apparatus for the damping of bulk material in which a liquid is to be sprayed into a falling stream of the material, the apparatus including an upright tubular shaft through which the material is to fall in a stream; a plate arranged coaxially below the lower end of the tubular shaft and defining an annular gap between the tubular shaft and the plate through which the material will pass after falling through the tubular shaft; at least one spray nozzle arranged below the plate in a spraying region, and a housing which encloses the lower end of the tubular shaft, the plate and the spraying region and nozzle or nozzles.

Abstract: A roller press for compacting and briquetting bulk material having rollers, each comprising a core, segments arranged adjacent one another around the surface of the core, adjusting springs by which the segments are fixed on the roller core in the circumferential direction, clamping rings having frusto-conical faces on projections which abut frusto-conical faces on projections on the segments, and clamping bolts extending through the clamping rings and passing between the longitudinal edges of the segments. Each clamping ring is provided at its inner circumference with adjusting spring grooves parallel to the axis of the clamping ring and the adjusting springs for the segments extend parallel to the axis of the roller beyond the end of the segment to such an extent that they engage in the adjusting spring grooves in the clamping ring.

Abstract: Method and apparatus for the briquetting of metal swarf, pellets and powders on roller presses having briquetting rollers which are provided with moulding depressions on their cylindrical surfaces by which a briquette extrusion is formed having alternating briquette mouldings extending from one or other side of the extrusion and arranged in a chequerred pattern, each briquette moulding having a plane face on the opposite side of the extrusion. The extrusion is separated into individual briquettes by a surface pressure applied to the extrusion substantially at right angles to the plane of the extrusion.