Abstract: A mineral material processing plant, a crusher and an upper frame for a crusher. The upper frame includes a central hub for receiving a main shaft of the crusher, an upper rim, and a spider arm. A u-shaped cavity extends towards a lower flange from the upper rim.

Abstract: A method for treating process water of a flotation arrangement, the flotation arrangement including a flotation arrangement including a mineral flotation line and a process water treatment arrangement for treating underflow of the of the mineral flotation line. The method includes the steps of a) dewatering underflow from the flotation in a gravitational solid-liquid separator; b) subjecting supernatant from step a) to cleaning flotation for collecting at least fine particles and residual flotation chemicals, for separating at least fine particles and residual flotation chemicals from the supernatant into cleaning flotation overflow, and for forming purified process water as cleaning flotation underflow; c) removing cleaning flotation overflow as tailings, and d) recirculating purified process water into the mineral flotation line.

Abstract: A retainer assembly for securing a mantle to a mainshaft of a gyratory crusher. The retainer assembly includes a headnut and a burn ring that are joined to each other prior to installation. The headnut includes a first and a second series of bores that each extend though the annular headnut. A series of jacking bolts are installed in the second series of bores and a series of connector are installed in the first series of bores. The combination of the headnut and burn ring are installed on the mainshaft. Once in place, the connectors are removed and a series of cylinders are positioned in the first series of bores. The cylinders are pressurized to create a gap between the headnut and the burn ring. The series of jacking bolts are rotated to maintain the gap and one or more shims can be positioned in the gap. The cylinder are removed and a headnut cover is installed to protect the headnut. During removal of the headnut, the cylinders can be reinstalled and pressurized.

Abstract: A feedwell apparatus trough, plant and use. The apparatus is adapted to materials including liquids carrying suspended particles, such as slurry containing minerals. The feedwell apparatus includes a supply channel for receiving the material, a trough, a first end of which being connected in fluid communication with the supply channel. The trough has a curved shape that turns in one direction, and a series of through-openings in the wall(s) of the trough. The through-openings are arranged in the trough in unequal pattern such that the area of the through-openings in pro-portion to the corresponding area of the walls has its minimum value in portion of the trough close to the first end thereof, and the relation being arranged to grow with the distance from the first end.

Abstract: A computer-implemented point-cloud data acquisitioning method for acquiring point-cloud data of the inside of a mining equipment. The method includes the step of acquiring from a sensor, a first dataset and a second dataset, wherein each dataset includes datapoints at coordinates. The method extracts features from the first and second dataset and aligns the first and second dataset using the extracted features. The first and second dataset are aligned into a point-cloud data. The geometry of the mining equipment is estimated based on the point-cloud data and the point-cloud data is used to identify a region of the estimated geometry indicating insufficient data.

Abstract: An impeller and a diffusor is provided which are configured to be used in a flotation tank to enhance mixing of gas and slurry. The impeller comprises two opposing inlet ends and the diffusor comprises two opposing inlet mouths. The impeller is configured, when arranged inside the diffusor, to pump a bi-directional axial flow of slurry into the diffusor. Further, an arrangement using such diffusor and impeller for the use in a flotation tank to enhance mixing of gas and slurry is provided.

Abstract: A stirring device for stirring a particulate material and a grinding media in a grinding mill includes one or more protective elements that extend outwardly from a body to deflect the particulate material and the grinding media from the body to minimize contact of the mixture of the particulate material and the grinding media against the body and to promote contact between the particulate material and the grinding media.

Abstract: The disclosure relates to a roller crusher including a first grinding roll and a second grinding roll, the first and second grinding rolls being arranged generally in parallel to each other and to define a crushing gap therebetween and drivable in a counter-rotating manner. The roller crusher includes a device of a first type for loosening granular material present on a crushing surface of at least one of the rolls, the device including at least one rotatable disc element. The subject further relates to a roller crusher, wherein the plurality of disc elements is individually rotatable.

Abstract: The disclosure relates to a rotor for a comminution apparatus, the rotor comprising: a frame including an upper plate, a lower plate and wall elements; an inlet opening in the upper plate and one or more outlets located between the upper plate and the lower plate; and a distributor plate arranged at an upper surface of the lower plate below said inlet opening wherein the distributor plate is arranged to launch the material towards the surface, wherein the distributor plate comprises a cavity being open at a lower surface of the distributor plate, wherein the rotor further comprises attachment means for maintaining the distributor plate at the upper surface of the lower plate, wherein said attachment means are arranged to frictionally engage with a corresponding surface of the cavity and wherein the attachment means enable the distributor plate to be repositioned into different wear positions.

Abstract: A modular screen support deck for a screening arrangement includes a first deck side having an inward facing side and an outward facing side and a second deck side having an inward facing side and an outward facing side. The first and second deck sides extend in parallel with each other to define a deck plane. A first extension structure is connected to the first deck side and extends inwardly from the first deck side. The first extension structure includes a first connection structure and a second extension structure connected to the second deck side and extending inwardly from the second deck side. The second extension structure includes a second connection structure arranged a distance from the second deck side. The support deck includes a first cross-member with a first and second ends, the first end being connected to the first connection structure and the second end being connected to the second connection structure.

Abstract: A method and apparatus for combustion of fuel in a combustion chamber with a hydraulic diameter D. Fuel and a primary oxidant are introduced via a burner lance into the combustion chamber, having a certain mean velocity u1 at entry, and a secondary oxidant with a mean velocity of u2 is introduced into the combustion chamber. The burner lance has a position p that has a distance Id1I defined as the smallest distance between p and a combustion chamber centerline.

Abstract: A flotation cell for treating particles suspended in slurry. The flotation cell includes a fluidized bed; a recovery zone at an upper part of the flotation cell; a launder lip and a recovery launder; a tailings outlet arranged below the recovery launder; and a first feed inlet arranged to supply a primary slurry feed comprising fresh slurry into the fluidized bed at a first position. The flotation cell has a height measured from the bottom of the flotation cell to the launder lip. The flotation cell includes an agitator arranged adjacent to the bottom of the fluidized bed.

Abstract: A flotation cell for treating particles suspended in slurry. The flotation cell includes a fluidized bed, a recovery zone at the upper part of the flotation cell, a launder lip and a recovery launder, and a tailings outlet. A primary slurry feed including fresh slurry is arranged to be fed into the flotation cell by a first feed inlet at a first position; and a secondary slurry feed including at least slurry recirculated from a flotation cell is arranged to be fed into the fluidized bed by a second feed inlet at a second position, below the first position. The slurry recirculated from the flotation cell is obtained at a third position between the recovery launder and the tailings outlet. A use of the flotation cell as well as a method for treating particles suspended in slurry are also disclosed.

Abstract: Disclosed is a deflection distributor refitting kit for a roller crusher. According to the disclosure the deflection distributor refitting kit comprises a deflection distributing shaft, thrust rods each having first and second ends and mounts for attachment of the deflection distributing shaft at a frame of the roller crusher, wherein a first end of each of said thrust rods is attached to the deflection distributing shaft via a lever, wherein a second end of each of the thrust rods is arranged to be attached to a movable bearing housing of the roller crusher, and wherein the deflection distributing shaft comprises at least two interconnectable sub-shafts. Also disclosed is a method for mounting the deflection distributor refitting kit, as well as a roller crusher comprising a deflection distributor.

Abstract: A method for cleaning of a roller screen transporting and screening particles by means of at least three rotating rollers. The rollers are installed in succession at given clearances and arranged transversally in relation to the transport direction of the particles to screen a desired range of particle sizes. At least one roller changes its circumferential velocity and/or its rotational direction over time at defined time intervals for defined time periods such that for this defined time period for at least one pair of neighbored rollers one roller has a higher circumferential velocity than the other and/or both rollers roll in opposite rotational directions.

Abstract: Disclosed is a deflection distributor refitting kit for a roller crusher. According to the disclosure the deflection distributor refitting kit comprises a deflection distributing shaft, thrust rods each having first and second ends and mounts for attachment of the deflection distributing shaft at a frame of the roller crusher, wherein a first end of each of said thrust rods is attached to the deflection distributing shaft via a lever, wherein a second end of each of the thrust rods is arranged to be attached to a movable bearing housing of the roller crusher, and wherein the deflection distributor refitting kit further comprises a preload arrangement which induces a bias to parts of the deflection distributor refitting kit. Also disclosed is a method for mounting the deflection distributor refitting kit, as well as a roller crusher comprising a deflection distributor.

Abstract: An X-ray fluorescence analyzer includes an X-ray tube for emitting incident X-rays in the direction of a first optical axis. A slurry handling unit is configured to maintain a constant distance between a sample of slurry and the X-ray tube. A first crystal diffractor is located in a first direction from the slurry handling unit and configured to separate a predefined first wavelength range from fluorescent X-rays that propagate into the first direction. The first crystal diffractor is configured to direct the fluorescent X-rays in the separated predefined first wavelength range to a first radiation detector. The first crystal diffractor includes a pyrolytic graphite crystal that has a diffractive surface, which is a simply connected surface. The first radiation detector is a solid-state semiconductor detector.

Abstract: A crusher having a protective liner, the protective liner including a plurality of lining segments which are arranged circumferentially along an a of the crusher. At least some of the segments have a trapezoidal shape with two bases of different lengths arranged parallel to the circumferential direction of the wall and two non-parallel legs connecting the bases. Further, at least some of the segments are arranged along the circumference of the wall such that long and short bases of adjacent segments alternate, and wherein at least some of the segments are allowed to vary in their axial position with respect to adjacent segments to compensate for tolerances in diameter of the wall of the crusher.

Abstract: A method of removing cations from water and a process arrangement for performing the method, wherein the method includes containing cations selected from a group consisting of Se, As, Sb, Cr, Mn, Mo, W, V, Te, P, Si including preparing an iron precipitate-containing sludge by electrochemical water treatment, wherein the water is led through an electrochemical water treatment unit, wherein electricity dissolves iron from an anode to the water thereby forming an iron precipitate-containing sludge to which cations to be removed are adsorbed/co-precipitated, adsorption and co-precipitation enhancing to provide a very high density sludge having an iron precipitate concentration of 50-400 g/l thereby further adsorbing cations contained in the water, and separating solids from the obtained sludge thereby producing treated water having a reduced cation content and solids comprising iron precipitate compounds and adsorbed/co-precipitated cation compounds.

Abstract: A method and arrangement for recovering lithium hydroxide from a mineral containing lithium, by pulping the raw material containing lithium in the presence of water and an alkali metal carbonate, leaching the obtained slurry twice, first at an elevated temperature, and secondly in an aqueous solution containing an alkali earth metal hydroxide, separating the thus obtained slurry into solids and a solution containing lithium hydroxide, the latter being purified, whereby lithium hydroxide monohydrate can be recovered from the purified solution by crystallising, and finally separating the solution obtained during the crystallization from the process and recycling it to one or more of the previous process steps.