Abstract: A pulp lifter assembly for a rotary grinding mill includes an outer pulp lifter having walls defining a pulp lifter chamber and an outlet opening for radially inward discharge of slurry from the pulp lifter chamber, and an inner discharger disposed radially inward of the outer pulp lifter and circumferentially offset from the outer pulp lifter. The inner discharger defines a passage for conveying slurry substantially radially inward. A transition discharger is disposed radially between the outer pulp lifter and the inner discharger. The transition discharger has a first wall bounding an interior space and a second wall dividing the interior space into first and second regions. The second wall includes a guide that bounds a channel connecting the outlet opening of the outer pulp lifter to the passage defined by the inner discharger.

Abstract: The invention provides a separation device (20) for separating pulp from a feed material, the separation device comprising a tank (1) for receiving the feed material, a rake assembly (21) mounted for rotation within the tank (1) to move pulp towards an outlet (22) thereof and a shearing device (23) for shearing pulp within the tank (1), the shearing device (23) being mounted for movement independently of the rake assembly (21). The invention also provides a method for reducing donutting in a separation device (20).

Abstract: The invention relates to an apparatus and a method for thickening liquids carrying suspended particles, such as a slurry containing minerals. The thickening apparatus comprises a tank (2), a feedwell (4), which includes a chamber having an inlet for receiving feed slurry (9) and an outlet in fluid communication with the tank and means for distributing the material in the tank, at least one conduit (5) for feed slurry to deliver a feed slurry (9) into the feedwell, means for diluting the feed slurry, when at least one separate dilute liquid conduit (16, 19) is directed tangentially with respect to the feedwell (4) and at least one inflow aperture (15) is arranged tangentially with respect to the feedwell for recirculating the dilute liquid from the tank inside the feedwell in order to dilute the feed slurry.

Abstract: The invention relates to a rotor of a flotation machine, particularly to a rotor, that is used for dispersing air to a slurry, and which rotor comprises alternating air ducts and slurry grooves and a collar fitted to the rotor for guiding the slurry flow into the interior of the rotor for avoiding undesired cross flow effect of the slurry flow. The rotor of the present invention efficiently prevents sanding effect and provides excellent dispersion of air into the slurry.

Abstract: The invention provides a method (20) for controlling a disturbance (15) to networked pulp in a separation device comprising a tank (1), the method (20) comprising the steps of introducing a feed material into the tank at a flux (21); allowing pulp to settle out of the feed material and form into a networked layer of pulp (22); disturbing the networked pulp in a disturbance zone (16) of the networked layer (23); and controlling one or more disturbance parameters with respect to the flux and/or one or more operational parameters to controllably apply an optimal disturbance to the networked pulp in the disturbance zone (31). The invention also provides a separation device for separating pulp from a feed material.

Abstract: The invention relates to a turning device for metal deposits used in combination with a separating device, comprising at least one turnable receiving unit mounted on a rotating axle under the separating device and in the vicinity of at least one conveyor, guiding means for guiding a metal deposit to a receiving unit acting as a turning device and means for rotating the receiving unit. The invention also relates to a method for handling metal deposits.

Abstract: A method for coating the base element of a cooling element used in connection with a metallurgical furnace or the like, said base element being mainly made of copper, at least partly with a metal coating involves a step wherein the metal coating is explosion welded to the base element of a cooling element mainly made of copper. A cooling element, particularly to be used in connection with metallurgical furnaces or the like, includes a base element mainly made of copper, in which base element there is arranged a cooling water channel system, said base element of the cooling element being at least partly coated with a metal coating. The metal coating is explosion welded to the base element that is mainly made of copper.

Abstract: An apparatus for reducing a metalliferous material in a fluidized bed includes a vessel for containing the fluidized bed, a mechanism for supplying the metalliferous material, a solid carbonaceous material, an oxygen-containing gas, and a fluidizing gas into the vessel for forming the fluidized bed in the vessel. The oxygen-containing gas supply mechanism includes one or more than one oxygen-containing gas injection lance having a lance tip with an outlet that is positioned for injecting the oxygen-containing gas in a downward flow into the vessel within a range of plus or minus 40° to the vertical.

Abstract: A method for manufacturing a cooling element for a metallurgical furnace, wherein there is arranged a frame element mainly made of copper and provided with water cooling channels; in the frame element, there are arranged fastening elements for connecting refractory bricks to the frame element; and refractory bricks are connected to the frame element by using fastening elements; and wherein the fastening elements are at least partly formed of elongate steel fastening strips; the method comprising fastening the elongate fastening steel strips to the frame element so that the elongate fastening steel strips together form in between them an open interspace, which is narrowed in a direction pointed away from the bottom of the open interspace; and arranging refractory bricks in the open interspace so that the refractory bricks are located at least partly in the open interspace.

Abstract: A sealing device is arranged around a rod electrode extending vertically through an aperture made in the ceiling of an arc furnace and being vertically movable inside the furnace to prevent the access of gases from the furnace through the aperture to the atmosphere, and on the other hand to prevent air from flowing from the atmosphere into the furnace. The sealing device comprises a gas distribution chamber provided with an inlet channel for feeding essentially passive gas, such as nitrogen or air, into the gas distribution chamber. The sealing device also includes a slit nozzle encasing the electrode, through which nozzle a gas jet is arranged to be discharged from the gas distribution chamber towards the electrode in a direction that is at an angle with respect to the horizontal plane and has a slightly upwards inclined orientation, and that is, with respect to the furnace interior, pointed outwardly, so that the sealing is carried out owing to the effect of the created stagnation pressure.

Abstract: The invention provides several improvements in feedwells, one of which being a feedwell (100) comprising a mixing zone (49) for dissipating the kinetic energy of a fluid comprising pulp, a settling zone (50) for promoting flocculation of the pulp and at least one inclined deflecting element (101) for at least partially separating the mixing zone from the settling zone. Other improvements include a shelf (3) at least partially defining an inclined path (4) for removing material from the shelf into a feedwell chamber; at least two outlets (111, 112) arranged in a substantially concentric relationship with respect to each other; a portion (123) of a second conduit (121) varies in its cross-sectional size and/or shape so as to connect a feed inlet (110) to a first conduit (120); and a partition (133) for partially separating an outer mixing zone (131) and an inner settling zone (132).

Abstract: In the method and system, a number of electrolytic cells are arranged as a cell group, which cells are separated by a number of partition walls; in each cell, a number of anodes and cathodes are arranged in an alternating order, so that in each cell, next to each anode, there is arranged a cathode, and so that in each cell, each individual anode is fitted in the same anode line with the anode of the adjacent cell, and in each cell, each individual cathode is fitted in the same cathode line with the cathode of the adjacent cell, and each anode is galvanically connected to at least one cathode of the adjacent cell. The flowing direction of the current passing in the cell group is deviated in different directions in order to make the current flow mainly in the direction of the cell group.

Abstract: The invention relates to a system used in the liquid-liquid extraction of metals, enabling the amount of organic solution required in the various stages of extraction to be significantly reduced. In accordance with the invention, the settler unit of one step belonging to an extraction system is selected to function also as the organic solution storage and pumping tank.

Abstract: The invention provides an apparatus (1) for deaerating a feed liquid (3) comprising a liquid suspension or pulp, the apparatus comprising a feed conduit (2) to convey the feed liquid (3) into a separator (4), the separator (4) comprising a mechanical agitator (5) for inducing a rotational flow of the feed liquid in a separation chamber (6), such that the rotational flow generates a centrifugal vortex (15) to separate the feed liquid into a first component (7) consisting essentially of froth or gas and a second component (8) consisting essentially of deaerated liquid or sludge, the separator (4) further comprising a device (17) for controlling the location of the vortex (15) in the separation chamber (6). The invention also provides a method for deaerating a feed liquid (3) comprising a liquid suspension or pulp.

Abstract: The invention relates to an arrangement and method for monitoring and presenting the status of an electrolytic process in an electrolytic cell (1). The arrangement is characterized by a return channel arrangement (8) for transmitting status information, established by the data processing means (7) of a data processing device (6) and describing the status of the electrolytic process in the electrolytic cell (1), from the data processing device (6) to an indicator device (9) arranged in connection with the electrolytic cell (1). The indicator device (9) comprises first presentation means (10) for presenting the status information established by the data processing means (7) of the data processing device (6) and describing the status of the electrolytic process in the electrolytic cell (1).

Abstract: The invention provides an agitator (1) is disposed to agitate slurry within a flotation tank (2). The agitator includes a rotor (6) mounted on one end of a centrally disposed drive shaft (7) extending axially downwardly into the tank and driven by a motor (8) and associated gearbox (not shown). The other end of the drive shaft includes a mounting flange (9) adapted for connection to the motor. A stator (10) is also provided around the rotor. A froth deflection cone (11) extends around the drive shaft adjacent the top of the tank. The deflection cone is oriented such that its smallest diameter is located at its lower-most end nearest the rotor (6). An auxiliary agitator (12) is connected to the drive shaft at a position substantially midway between the underside of the deflection cone (11) and the top of the rotor (6), as shown in FIG. 1 and FIG. 2. The auxiliary agitator (12) includes agitation blades (13) extending radially outwardly from diametrically opposite sides of the shaft (7).

Abstract: A process for heat treatment of fine-grained mineral solids includes passing fine-grained mineral solids through a flash reactor so as to contact the fine-grained mineral solids with hot gases in the flash reactor at a temperature of 450 to 1500° C. so as to obtain hot solids. The hot solids arc passed through a residence time reactor at a temperature of 500 to 890° C. The hot solids are withdrawn from the residence time reactor after a residence time of 1 to 600 minutes. A waste gas of the residence time reactor is recirculated to at least one of the flash reactor and a preheating stage.

Abstract: The present invention relates to a method for the conveyance of fine-grained solids in a fluidized bed reactor and also to a corresponding plant. It is proposed to introduce a first gas or gas mixture from below through a central tube (3) into a mixing chamber (7) of the reactor (1), the central tube (3) being at least partly surrounded by a stationary annular fluidized bed (10) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (10) are adjusted such that the particle Froude numbers in the central tube (3) are between 1 and 100, in the annular fluidizied bed (10) between 0.02 and 2 in the mixing chamber (7) between 0.3 and 30.

Abstract: A process for at least one of a chemical and a physical treatment of fluidizable substances in a reactor. The process includes introducing a hot gas into an interior of the reactor through a gas supply tube and cooling at least one of the hot gas and the gas supply tube with a coolant. The cooling is performed by contacting the hot gas with the coolant so as to provide a temperature of a wall of the gas supply tube at least 50° C. lower than a temperature of the gas at an inlet of the gas supply tube facing away from the interior of the reactor.

Abstract: A process for the production and/or treatment of at least one metal in a reactor includes discharging a waste gas stream via a waste gas conduit and after-treating the waste gas stream by supplying a cooling gas and/or a cooling gas mixture. The after-treating includes injecting the cooling gas and/or cooling gas mixture into the waste gas conduit on a side of the waste gas conduit facing the reactor, at a high velocity and substantially tangentially with respect to a main flow direction of the waste gas. A volume of the cooling gas and/or the cooling gas mixture injected into the waste gas conduit is adjusted so as to reduce a mixing temperature below a melting temperature of the molten particles and/or a condensation temperature of the vaporous constituents of the waste gas stream.