Abstract: A calcination unit able to decarbonate raw materials intended for clinker production, the unit including: a main duct in which the raw materials circulate according to a first movement direction, the raw materials being calcined in the main duct; a solid fuel supply duct opening onto the main duct via a fuel outlet, the solid fuel moving according to a second movement direction; a retaining device located in the main duct and arranged opposite the solid fuel outlet so that the solid fuel arriving in the main duct via the fuel outlet passes through the retaining device.

Abstract: A method for producing calcined clay having desired colour characteristics. The method includes: a step of calcining a clay in a calcination furnace, the calcination step being carried out under stoichiometric or oxidising conditions, and a step of reducing iron (III) oxides present in the calcined clay in a reduction system separate from the calcination furnace, this reduction step being carried out by injecting a reduction gas, containing hydrogen atoms and placed in direct contact with the calcined clay.

Abstract: A method of separating different constituents of a fine fraction that is produced in a prior method for separating a concrete for deconstruction. The method allows the reuse of these different constituents in the production of a new cement and/or of a new concrete, the fine fraction including sand and at least 30% by mass of hydrated cement paste.

Abstract: A method of separating different constituents of a fine fraction that is produced in a prior method for separating a concrete for deconstruction. The method allows the reuse of these different constituents in the production of a new cement and/or of a new concrete, the fine fraction including sand and at least 30% by mass of hydrated cement paste.

Abstract: Disclosed is a method for dissociating different constituents of a heterogeneous artificial material, including the fragmentation of the material in a fragmentation machine by material-bed compression, the machine including at least one vibrator and a system for controlling at least one parameter of the fragmentation force from the speed of rotation of the vibrator and the phase shift angle between at least two vibrators. The control system adjusts a rotation parameter of the vibrators so as to generate a fragmentation force by the machine allowing to at least partially dissociate at least one of the constituents of the material from the other constituents.

Abstract: Method for repairing the teeth of a toothed ring gear, the method using a removable machining device, including a frame and a part moving with respect to the frame, supporting a cutting member, the method including: attaching the machining device to the toothed ring gear by tightening the machining device onto the ring gear in an attachment position on the ring gear with respect to the tooth to be machined; machining the tooth in an automated manner by control of the cutting organ following predetermined machining operations, in which the machining device is moved from an attachment position on the toothed ring gear corresponding to the previously machined tooth, to an attachment position of a neighboring tooth to be machined, while the toothed ring gear is stationary, the machining device being suspended and held by at least one tensioned cable connected to the frame of the rotating machine.

Abstract: A mill for crushing a bed of materials by compression includes: a horizontal-axis cylinder the interior wall having a runway track for a crushing roller placed inside the cylinder, a unit rotating the cylinder at a speed that spins the material outward, the crushing roller, a unit for pressing the crushing roller against the runway track of the cylinder, an inlet for supplying material for crushing at one end of the cylinder and an outlet for crushed material at the other end, a unit for controlling the movement of the material so it travels over only a fraction of the length of the cylinder in each revolution and passes between the cylinder and the roller several times before reaching the outlet. The runway track is followed by a downstream lip opposing material flow, downstream of the crushing roller in the direction in which the material travels.

Abstract: A method of grinding a mineral material (10) containing at least calcium impurities implemented in a plant (1) including a grinder (2) and a granulometric selection device, referred to as a selector device (3), able to separate the materials into two fractions. The method includes the following steps: grinding the mineral material by material bed compression with the grinder to obtain a ground material, separating the ground material into a fine fraction and a coarse fraction with the selector device, returning the coarse fraction (13) to the grinder (2) for a further grinding step. At least part of the ground material is subjected to sorting intended to separate the metal impurities from the mineral materials. A plant as it stands, and the method and installation will find a particular use for producing hydraulic binders such as cement.

Abstract: Method for repairing the teeth of a ring gear and a machining device unit including a frame and a moving part bearing a cutting member movable along multiple axes with respect to the frame, the method including: attaching the machining device to the ring gear by tightening parts rigidly attached to the frame of the machining device, engaging with the flanks of the ring gear, defining the position of the machining device with respect to the tooth to be machined by abutting on the flank of a reference tooth, the flank being situated, with respect to the summit of the reference tooth, in the direction opposite the flank of the tooth to be machined, the reference tooth being the tooth to be machined or an immediately preceding tooth, performing the machining of the flank of the tooth to be machined by control of the cutting member per predetermined machining operations.

Abstract: Method for repairing the teeth of a toothed ring gear, the method using a removable machining device, including a frame and a part moving with respect to the frame, supporting a cutting member, the method including: attaching the machining device to the toothed ring gear by tightening the machining device onto the ring gear in an attachment position on the ring gear with respect to the tooth to be machined; machining the tooth in an automated manner by control of the cutting organ following predetermined machining operations, in which the machining device is moved from an attachment position on the toothed ring gear corresponding to the previously machined tooth, to an attachment position of a neighboring tooth to be machined, while the toothed ring gear is stationary, the machining device being suspended and held by at least one tensioned cable connected to the frame of the rotating machine.

Abstract: Disclosed is a method for producing sintered material from organic raw materials, implemented in an apparatus comprising, a cyclone preheater, a rotary furnace and a grate cooler, and in which the raw materials are preheated in the cyclone preheater, the preheated material is calcined and sintered in the rotary furnace, and the calcined materials are cooled by blowing cooling air in the grate cooler, producing hot air. The hot air is separated into three upstream-to-downstream fractions, the three hot air fractions being at decreasing temperatures. The first air fraction acts as combustion air in at least the combustion zone of the rotary furnace and/or of the potential precalciner of the apparatus. The second air fraction is greater than the combustion air needs to produce energy. The third air fraction is directed at least in part to the combustion zone of the apparatus, providing combustion air with the first air fraction.

Abstract: A mill for crushing a bed of materials by compression includes: a horizontal-axis cylinder the interior wall having a runway track for a crushing roller placed inside the cylinder, a unit rotating the cylinder at a speed that spins the material outward, the crushing roller, a unit for pressing the crushing roller against the runway track of the cylinder, an inlet for supplying material for crushing at one end of the cylinder and an outlet for crushed material at the other end, a unit for controlling the movement of the material so it travels over only a fraction of the length of the cylinder in each revolution and passes between the cylinder and the roller several times before reaching the outlet. The runway track is followed by a downstream lip opposing material flow, downstream of the crushing roller in the direction in which the material travels.

Abstract: A device for cooling the opening of a rotary kiln via cool air-blowing, the kiln including a metal cylinder lined internally with a refractory material and being rotatably mounted relative to the frame of the kiln, into which materials are intended to be inserted and fired. The cooling device includes: the aforementioned cylinder and a metal cylinder end part covered with a refractory material and secured to the cylinder; two concentric metal casings, known as the inner and outer casing, which surround the cylinder of the kiln and form two annular channels; and ventilation elements that allow cool air to flow through the annular channels. The device includes: an annular distribution chamber which surrounds the cylinder, is secured thereto and supplies the first channel with air; ventilation elements including at least one fan and an electric motor actuating the fan, and supplying the distribution chamber in an air-tight manner.

Abstract: A compressive grinder for a bed of materials, includes: a cylinder having a horizontal axis, and an inner wall having a raceway for a grinding roller arranged inside the cylinder; elements for rotating the cylinder about the axis; the grinding roller having an axis parallel to that of the cylinder; elements for urging the grinding roller against the raceway; an input for supplying material to be ground at one end of the cylinder and an outlet for ground material at the other end. The grinder includes: a smoothing roller upstream of the grinding roller in the cylinder's direction of rotation; elements for keeping the smoothing roller adjacent to and separated from the raceway, such that, upon each cylinder turn, the material consecutively passes under the smoothing roller and then under the grinding roller, the smoothing roller exerting, on the bed of materials, a pressure that smoothes the surface thereof.

Abstract: A hydrodynamic bearing for supporting a hollow cylinder that may be deformable in the radial direction, driven in a rotational movement about its axis, the diameter being greater than or equal to one meter, the bearing essentially consisting of a bushing and a bushing support, and in which the bushing, notably of constant thickness, extends over a portion of cylinder of axis ?, having a guide surface, intended to follow the exterior surface of the cylinder via a film of lubricant, and a surface secured to the bushing support. The bushing support has, if appropriate locally, at least in the region of an intermediate zone of the bearing, cross-section-reducing elements allowing elastic deformation of the bearing so as to limit the maximum value of the guide forces over the bushing. The bearing is useful in supporting and guiding a rotating hollow grinder subjected to unevenly distributed forces during rotation.

Abstract: A method for producing cement clinker in a plant that includes: a first cyclone preheater and a second cyclone preheater for preheating first and second portions of a raw material, respectively; a precalcinator using a combustion gas for burning a fuel, the fumes released by the precalcinator being directed to the second cyclone preheater; a rotary furnace provided with a fuel burner, the fumes released by the rotary furnace being directed to the first cyclone preheater; and a clinker cooler that blows cooling air across the clinker at the outlet of the rotary furnace. According to the method, the precalcinator combustion gas contains between 90 and 100 vol % of oxygen. The precalcinator may consist of a fluidized bed, the fluidization gas being the combustion gas. The invention also relates to a plant as such.

Abstract: A device for the selective granulometric separation of solid powdery materials using centrifugal action, capable of separating materials into a fine material fraction and a coarse material fraction, includes: a housing, a cylindrical rotor rotatable, relative to the housing, about a vertical axis inside the housing and provided with blades evenly distributed on the periphery of an upper outlet opening through which a stream of gas, laden with particles having a size lower than a predetermined particle size, is drawn, a set of vertical adjustable vanes evenly distributed about the rotor along the generatrices of a virtual cylinder and directing the gas stream towards the rotor, elements for feeding the particles between the vanes and the rotor, collecting unit lower than the rotor for collecting the unfed particles having fallen and having a size larger than the predetermined particle size.

Abstract: A device for cooling the opening of a rotary kiln via cool air-blowing, the kiln including a metal cylinder lined internally with a refractory material and being rotatably mounted relative to the frame of the kiln, into which materials are intended to be inserted and fired. The cooling device includes: the aforementioned cylinder and a metal cylinder end part covered with a refractory material and secured to the cylinder; two concentric metal casings, known as the inner and outer casing, which surround the cylinder of the kiln and form two annular channels; and ventilation elements that allow cool air to flow through the annular channels. The device includes: an annular distribution chamber which surrounds the cylinder, is secured thereto and supplies the first channel with air; ventilation elements including at least one fan and an electric motor actuating the fan, and supplying the distribution chamber in an air-tight manner.

Abstract: A compressive grinder for a bed of materials, includes: a cylinder having a horizontal axis, and an inner wall having a raceway for a grinding roller arranged inside the cylinder; elements for rotating the cylinder about the axis; the grinding roller having an axis parallel to that of the cylinder; elements for urging the grinding roller against the raceway; an input for supplying material to be ground at one end of the cylinder and an outlet for ground material at the other end. The grinder includes: a smoothing roller upstream of the grinding roller in the cylinder's direction of rotation; elements for keeping the smoothing roller adjacent to and separated from the raceway, such that, upon each cylinder turn, the material consecutively passes under the smoothing roller and then under the grinding roller, the smoothing roller exerting, on the bed of materials, a pressure that smoothes the surface thereof.

Abstract: Method for cooling granular solid materials from a continuous curing facility having at least one area for burning a fuel to cure granular materials, wherein the curing of the granular materials, then the cooling of the cured granular materials is carried out in two consecutive steps, a first cooling step in a first cooler and a second cooling step in a second cooler, the method including: providing a cold air source for cooling the granular materials, the cold air source directly supplying air to the second cooler by blowing, and the air heated by the cured granular materials being used during the cooling as combustion gas for the burning area. All gases generated by the first and second coolers are routed to the burning area for use as a combustion gas, and the amount of cold air blown to the second cooler is adjusted to cover the air combustion needs.