The invention relates to a device for producing expanded granulated material (2) from mineral material (1) in the form of grains of sand with an expanding agent, comprising a furnace (3) with a furnace shaft (4), which has an upper end (5) and a lower end (6), wherein a conveying section (7) extends between the two ends and passes through a number of heating zones (8) arranged separately from one another in a conveying direction (10), wherein at least one feeding means is also provided, in order to charge at least the unexpanded material into the furnace shaft at one of the two ends in the direction of the other of the two ends. According to the invention, at least one rotatable shaft insert (11) is provided, which is arranged at least in sections in the furnace shaft and has at least one scraper blade (12) which forms with an inner wall (13) of the furnace shaft at least one gap (14) having a gap width (18) and which is designed, during the rotation of the at least one shaft insert in an operating state of the device, to remove caking (15) on the inner wall at least in sections if a thickness (16) of the caking is greater than the respective gap width.
Device for producing expanded granulated material (2) from mineral material (1) in the form of grains of sand with an expanding agent, comprising a furnace (3) with a furnace shaft (4), which has an upper end (5) and a lower end (6), wherein a conveying section (7) extends between the two ends and passes through a number of heating zones (8) arranged separately from one another in a conveying direction (12), wherein at least one feeding means (10, 11) is also provided, in order to charge at least the unexpanded material into the furnace shaft at one of the two ends in the direction of the other of the two ends. The invention provides at least one directing element (13), which is at least partly arranged in the furnace shaft, wherein the directing element forms a gap (15) with an inner wall (14) of the furnace shaft, at least in the region of one of the two ends, wherein the at least one feeding means is designed for charging the material into the gap.
The invention relates to a bitumen product (1) comprising bitumen (3) and a mineral filler. In order to reduce the specific weight of the bitumen product (1) while allowing sufficient sealing effect, the mineral filler contains expanded perlite grains (2), said expanded perlite grains (2) having a closed-cell surface (4), and the expanded perlite grains (2) having a closed-cell surface (4) are not ground.
The invention relates to a method for producing an expanded granular material from sand grain-like mineral material which comprises a bound blowing agent, for example for producing an expanded granular material from perlite sand, wherein the sand grain-like mineral material is introduced into a feed opening at one end of a furnace shaft, conveyed along a thermal treatment section in a conveying direction, preferably by force of gravity, heated to a critical temperature while being conveyed through the thermal treatment section, starting at which temperature the sand grain-like mineral material plasticizes and begins to expand as a result of the blowing agent, and the expanded granular material is discharged at another end of the furnace shaft.
A hollow spherical glass particle, comprising aluminum oxide Al2O3, silicon dioxide SiO2 and at least one metal oxide, wherein the metal oxide is selected from the group consisting of alkali metal oxides and alkaline earth metal oxides, wherein the ratio of aluminum atoms to alkali metal atoms is about 1:1 and the ratio of aluminum atoms to earth alkali atoms is about 2:1, with the proviso that the hollow spherical glass particle is free of boron.
C03C 3/083 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C04B 28/00 - 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
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
C04B 28/14 - 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 calcium sulfate cements
C09K 8/473 - Density reducing additives, e.g. for obtaining foamed cement compositions
6.
METHOD AND DEVICE FOR PRODUCING AN EXPANDED GRANULATE
The invention relates to a method for producing an expanded granulate (29) made of a sand grain-shaped mineral material (1) using a propellant; wherein the material (1) is fed to a substantially upright furnace (2); wherein the material (1) is conveyed along a conveying path (4) through a plurality of vertically separated heating zones (5) in a furnace shaft (3) of the furnace (2), wherein each heating zone (5) can be heated by at least one independently controllable heating element (6); wherein the material (1) is heated to a critical temperature at which the surfaces (7) of the sand grains (1) become plastic and the sand grains (1) are expanded through the propellant. It is provided according to the invention that the material (1) is fed together with an amount of air from below, wherein the material (1) is conveyed from bottom to top along the conveying path (4) by means of the amount of air which flows from bottom to top within the furnace shaft (3) and forms an air flow (14), and wherein the expanding of the sand grains (1) occurs in the upper half, preferably in the uppermost third, of the conveying path (4).
B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
The present invention relates to a method for separating mineral impurities from calcium carbonate-containing rocks by comminuting the calcium carbonate-containing rocks to a particle size in the range of from 1 mm to 250 mm, separating the calcium carbonate particles by means of a dual energy X-ray transmission sorting device.
An object of the present invention is to provide a a process to grind at least one mineral material in the presence of ceria (CeO2)-containing zirconium oxide grinding beads having a specific ceria content (of between 14 and 20 % by weight relative to the total weight of said bead, preferably of between 15 and 18 %, and most preferably of approximately 16 %), and a specific average grain size (of less than 1 .mu.m, preferably of less than 0.5 .mu.m, and most preferably of less than 0.3 .mu.m), wherein such beads are more resistant to wear than conventional beads of the prior art. An other object of the present invention lies in the ground material in the form of an aqueous suspension and in the form of a dry product. An other object of the present invention lies in the uses of such products in any sector making use of mineral materials, and notably in the paper, paint and plastic industries.
An object of the present invention is to provide a process to obtain a calcium carbonate material comprising GCC and PCC, presenting a fraction of particles finer than 1 ~m of greater than 80%, preferably of greater than 85%, more preferably of greater than 90%, and even more preferably of greater than 95%, and a specific surface area of less than 25 m2/g, in a cost efficient manner, wherein GCC and PCC are co-ground, possibly with at least another mineral material. An other object of the present invention lies in the co-ground calcium carbonate material in the form of an aqueous suspension and in the form of a dry product. An other object of the present invention lies in the uses of such products in any sector making use of mineral material, and notably in the paper, paint and plastic industries.
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