Abstract: The invention relates to a method for manufacturing dispersed mineral products by grinding the mineral raw material, sizing the same in a flow classifier, sorting the same in dispersion in air, and climinating the dispersion air. Also disclosed are devices and installations for carrying out said method. In prior art, mineral raw materials cannot be purified or are purified very inefficiently such that only very pure and high-quality starting raw materials, which are available in limited quantifies only, can be used for manufacturing high-quality dispersed mineral products, especially fillers. The aim of the invention is therefore to create a method for manufacturing dispersed mineral products, particularly fillers, in a dry process as well as devices for carrying out said method.

Abstract: The invention relates to a method for manufacturing dispersed mineral products by grinding the mineral raw material, sizing the same in a flow classifier, sorting the same in dispersion in air, and eliminating the dispersion air. Also disclosed are devices and installations for carrying out said method.

Abstract: Raw materials useable in the manufacture of paper, cardboard and carton are recovered from waste sludge. After precipitation of the coarse particles, the sludge is centrifuged to remove black particles and then divided by fractional screening into its fiber, filler, pigment and agglomerate components. The agglomerate component is shear-treated and again fractionated, while the fibers, fillers and pigments, following further treatment if necessary, are fed to their points of reuse.

Abstract: The invention relates to a centrifugal force separator whose rotor shaft protrudes at at least one of the two axial ends through a chamber for the discharge of the fines and the air. Particularly, the invention relates to the problem, in a centrifugal force separator with bilateral aspiration of fines and air, of reducing the distance between the bearings of the rotor shaft, while at the same time achieving an optimum between the requirement for unhampered outlet of the fines and the separating air, on the one hand, and, on the other hand, the requirement of a short distance between the bearings and, therefore, a short, light rotor shaft. According to the invention, each outlet chamber 17,18 provides an extension 19,20 or boss reaching inward axially, in which a bearing 21,22, for the rotor shaft is contained.

Abstract: A centrifugal air separator with a housing provided with inlets for material to be separated and separating air or a combined material and air inlet, and outlets for air-and-fines mixture and coarse material, in which at least one wheel formed essentially of a crown of buckets is journal ed. The invention addresses the problem of reducing the distance of the bearings of the wheel shaft from one another, in a centrifugal air separator of this type, preferably a separator with fines-and-air aspiration at both ends. According to the invention, the fan wheel is journal ed on a central, fixed axle which is held in the housing and machine frame by arms, struts or other such supports.

Abstract: The invention relates to a stirring mill in whose grinding tank, provided with an inlet and an outlet, and charged with a load of grinding beads, a stirring shaft (stirring mechanism) provided with stirrers, is rotatable, on which, for holding back the grinding beads a separator is mounted ahead of the outlet and is provided with radial openings. The invention is addressed to the problem of creating a stirring mill with a grinding bead separator whose separation limit corresponds to the upper grain size of the fines, by which sieves or filters for holding back the grinding beads are avoided, and which nevertheless sufficiently assures that no grinding beads or particles of dispersants can enter into the finish-ground product. This problem is solved by the fact that the separator is formed by a rotor in the manner of a centrifugal force sifting rotor (6) wherein the passages are formed by the interstices or spaces between every two sifter rotor paddles (10).

Abstract: The invention relates to a method of operating a stirring ball mill which has a preferably cylindrical, rotating barrel provided with an inlet at one end and an outlet at the other end, in which a stirring shaft provided with stirring means rotates. This method includes operating the mill at supercritical rotatory speed with a degree of fill of at least 25%, while the balls are retained in the mill. In this manner a great throughput is achieved and a narrow grain size range, without requiring a great amount of space.

Abstract: A centrifugal classifier comprising a housing, which is provided with inlets for material to be classified and classifying air or with an inlet for material to be classified and classifying air and with outlets for fines and for coarses, and at least one rotor, which essentially consists of an annular series of blades and is movably mounted in the housing. The rotor is movably mounted in the housing by at least one bearing, which is adapted to be purged by a fluid and which serves also as a seal between the rotor or rotor shaft and the housing.

Abstract: An agitating mill, particularly an agitating ball mill, comprising a housing having an inlet for material to be ground and for air, an outlet for fines and air, and at least one horizontal agitator shaft which is provided with agitating members. The outlet for fines and air has a large area and is provided in the top wall of the housing and extends throughout the length and width of the top wall of the housing. A plurality of agitator shafts are preferably provided which are juxtaposed and superposed.

Abstract: A centrifugal classifier is disclosed having a high and adjustable yield of fine material. The classifier has a substantially cylindrical upright housing with an approximately tangential sifting-air inlet, in which are arranged, at a radial distance from, and centrally of, the casing of the housing, a vane-ring and, at a radial distance, inwardly therefrom, a sifting rotor with a lamination-ring forming radial passages, an inlet for the granular material to be classified opening, at the top, into the classifying area located between the said vane-ring and sifting rotor, and an outlet for the sifting air, charged with fine material, being located adjacent the rotor, the diameter of the outlet corresponding approximately to the inside diameter of the rotor, and the sifting-air inlet and the vane-ring extending over approximately the same axial length as the rotor, characterized in that the classifier as a whole is adapted to pivot about a horizontal axis.

Abstract: A centrifugal classifier is disclosed which has a higher throughput than existing classifiers. The classifier has a substantially cylindrical upright housing with an approximately tangential sifting-air inlet in which are arranged at a radial distance from, and centrally of, the casing of the housing, a vane-ring and, at a radial distance inwardly therefrom, a sifting rotor with a lamination-ring forming radial passages, an inlet for the granular material to be classified opening, at the top, into the classifying area located between the vane-ring and sifting rotor, and an outlet for the sifting air, charged with fine material, being located adjacent the rotor, the diameter of the outlet corresponding approximately to the inside diameter of the rotor, and the sifting-air inlet and the vane-ring extending over approximately the same axial length as the rotor, characterized in that the two end-faces of the sifting rotor are each located adjacent a fine-material/sifting-air outlet.

Abstract: Separating apparatus comprises a rotor having a plurality of impeller blades rotatably mounted in a support housing. In the normal course of apparatus use, fluid flow occurs through opposed rotor open ends. Drive motor elements for rotating the rotor are mounted partly in the rotor and partly in the surrounding casing whereby the rotor may be driven without the necessity of a drive shaft attached to the rotor, and the opposed rotor ends remain unobstructed.In one rotor embodiment, fluid enters the opposed rotor ends and is discharged radially by the rotor blades. In a second embodiment the fluid enters one rotor end and is discharged along an axial path from the opposite end.