Provided herein is a method of treating and upgrading industrial furnace by-products, such as steelmaking slag and incinerator bottom ash (IBA) into valuable products, the method comprising the steps (a) providing the industrial furnace by-product, (b) subjecting the industrial furnace by-product to separation crushing to obtain crushed industrial furnace by-products, (c) subjecting the crushed industrial furnace by-products to one or more magnetic separation step(s) to separate magnetic and non-magnetic particles, and (d) optionally subjecting said non-magnetic particles to fine grinding to obtain fine grinded particles. The fine grinded particles can then be used to produce cement clinkers in kiln.
The invention relates to clinker particles which can be used as a Cr(VI) reducing agent in production of cement. The clinker particles have a particle core of the clinker material comprising at least calcium silicates, calcium aluminates and iron compounds. The particle core is at least partially coated with a surface layer comprising iron-rich material, preferably in form of ferrites. The invention relates also to a method of making clinker particles. In the method, iron-rich material is applied on the clinker particles after the sintering zone but before clinker particles are cooled down to a temperature of ≤900 °C.
C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
233, calculated from the dry weight of the particulate material, and preferably 5 weight-% or less, more preferably 3 weight-% or less, of Fe(0). The invention relates also to method for manufacturing a particulate material which suitable for use as an active agent for reducing chromium(VI) to chromium(III) in a manufacture of cement, concrete or the like.
C04B 111/10 - Compositions characterised by the absence of a specified material
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
Described here is a method for recovering stainless steel from stainless steel slag, wherein the method comprises providing stainless steel slag, subjecting the stainless steel slag to dry milling followed by classifying the milled stainless steel slag to at least two fractions based on particle size characterised as small and middle fraction based on the particle size. The small and middle fractions are individually subjected to magnetic separation to separate a magnetic fraction from a non-magnetic fraction. The magnetic fractions are subjected to further separation to obtain particles with concentrated amount of stainless steel, which are subsequently recovered.
B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
B03B 9/04 - General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
B03C 1/30 - Combinations with other devices, not otherwise provided for
B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
Provided herein is a method of treating and upgrading industrial furnace by-products, such as steelmaking slag and incinerator bottom ash (IBA) into valuable products, the method comprising the steps (a) providing the industrial furnace by-product, (b) subjecting the industrial furnace by-product to separation crushing to obtain crushed industrial furnace by-products, (c) subjecting the crushed industrial furnace by-products to one or more magnetic separation step(s) to separate magnetic and non-magnetic particles, and (d) subjecting said non-magnetic particles to fine grinding to obtain fine grinded particles. An object of the invention is also to provide a dry concrete premix for making concrete. Another object of the invention is to provide a dry mortar premix.
C04B 18/167 - Recycled materials, i.e. waste materials reused in the production of the same materials
C04B 22/10 - Acids or salts thereof containing carbon in the anion, e.g. carbonates
C04B 40/00 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
Provided herein is a method of treating and upgrading industrial furnace by-products, such as steelmaking slag and incinerator bottom ash (IBA) into valuable products, the method comprising the steps (a) providing the industrial furnace by-product, (b) subjecting the industrial furnace by-product to separation crushing to obtain crushed industrial furnace by-products, (c) subjecting the crushed industrial furnace by-products to one or more magnetic separation step(s) to separate magnetic and non-magnetic particles, and (d) optionally subjecting said non-magnetic particles to fine grinding to obtain fine grinded particles. The fine grinded particles can then be used to produce cement clinkers in kiln.
Described here is a method for recovering stainless steel from stainless steel slag, wherein the method comprises providing stainless steel slag, subjecting the stainless steel slag to dry milling followed by classifying the milled stainless steel slag to at least two fractions based on particle size characterised as small and middle fraction based on the particle size. The small and middle fractions are individually subjected to magnetic separation to separate a magnetic fraction from a non-magnetic fraction. The magnetic fractions are subjected to further separation to obtain particles with concentrated amount of stainless steel, which are subsequently recovered.
A device for separating weakly magnetic first particles, for example hematite particles, from mixture (912) comprising the first particles (913) and less magnetic second particles (914) is presented. The device comprises first magnetizing equipment (901) for producing magnetic field and for moving the mixture so that mutually opposite polarity portions (N, S) of the magnetic field sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles. The device comprises also a supply equipment (932) for supplying the mixture to the carrier equipment with the aid of gravitation and a second magnetizing equipment (931) connected to a feed box (920) for producing second magnetic field for deflecting a direction of movement of the first particles differently than a direction of movement of the second particles when the mixture is moved by the gravitation towards the carrier equipment so as to generate, to the mixture arriving at the carrier equipment, a concentration gradient of the first particles. The pre-concentration of the first particles simplifies their separation form the mixture.
B03C 1/18 - Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
B03C 1/005 - Pretreatment specially adapted for magnetic separation
B03C 1/247 - Magnetic separation acting directly on the substance being separated with material carried by oscillating fieldsMagnetic separation acting directly on the substance being separated with material carried by travelling fields, e.g. generated by stationary magnetic coilsEddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
B03C 1/26 - Magnetic separation acting directly on the substance being separated with free falling material
9.
A DEVICE AND A METHOD FOR SEPARATING WEAKLY MAGNETIC PARTICLES
A device for separating weakly magnetic first particles, for example hematite particles, from mixture (912) comprising the first particles (913) and less magnetic second particles (914) is presented. The device comprises first magnetizing equipment (901) for producing magnetic field and for moving the mixture so that mutually opposite polarity portions (N, S) of the magnetic field sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles. The device comprises also a supply equipment (932) for supplying the mixture to the carrier equipment with the aid of gravitation and a second magnetizing equipment (931) connected to a feed box (920) for producing second magnetic field for deflecting a direction of movement of the first particles differently than a direction of movement of the second particles when the mixture is moved by the gravitation towards the carrier equipment so as to generate, to the mixture arriving at the carrier equipment, a concentration gradient of the first particles. The pre-concentration of the first particles simplifies their separation form the mixture.
B03C 1/005 - Pretreatment specially adapted for magnetic separation
B03C 1/26 - Magnetic separation acting directly on the substance being separated with free falling material
B03C 1/18 - Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
B03C 1/247 - Magnetic separation acting directly on the substance being separated with material carried by oscillating fieldsMagnetic separation acting directly on the substance being separated with material carried by travelling fields, e.g. generated by stationary magnetic coilsEddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
A device for separating weakly magnetic first particles, for example hematite particles, from mixture (112) comprising the first particles (113) and nonmagnetic second particles (114) is presented. The device comprises equipment (101, 102) for producing magnetic field and for moving the mixture so that mutually opposite polarity portions (N, S) of the magnetic field sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles. The deflected direction of movement of the first particles makes it possible to receive the first and second particles with separate collectors.
B03C 1/033 - Component partsAuxiliary operations characterised by the magnetic circuit
B03C 1/04 - Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables
B03C 1/06 - Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables with magnets moving during operation
B03C 1/18 - Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
B03C 1/247 - Magnetic separation acting directly on the substance being separated with material carried by oscillating fieldsMagnetic separation acting directly on the substance being separated with material carried by travelling fields, e.g. generated by stationary magnetic coilsEddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
B03C 1/253 - Magnetic separation acting directly on the substance being separated with material carried by oscillating fieldsMagnetic separation acting directly on the substance being separated with material carried by travelling fields, e.g. generated by stationary magnetic coilsEddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a linear motor
11.
USE OF A PARTICULATE MATERIAL AND METHOD FOR MANUFACTURING MATERIALS FOR CEMENT PRODUCTION
C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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