The present invention relates to apparatus for simultaneous grinding and froth flotation of at least one crude mineral and/or pigment, a process carried out in the apparatus for manufacturing at least one ground mineral and/or pigment, use of the ground mineral and/or pigment bearing phase obtainable by the process in paper applications as well as in paper, plastics, paints, coatings, adhesives, sealants, food, feed, pharma, concrete, cement, cosmetic, water treatment and/or agriculture applications, preferably in a wet end process of paper machine, in cigarette paper, board, and/or coating applications, or as support for rotogravure and/or offset and/or ink jet printing and/or continuous ink jet printing and/or flexography and/or electrophotography and/or decoration surfaces and the ground mineral and/or pigment bearing phase or ground mineral and/or pigment obtainable by the process.

A grinding installation for comminuting material may include a grinding apparatus and a classifying device that is connected to the grinding apparatus and classifies the material. The classifying device may include a static classifier and a dynamic classifier. The static classifier may be disposed so as to at least partially surround the dynamic classifier. The classifying device may comprise a coarse material outlet for discharging coarse material that comprises a coarse grain fraction, a grit outlet for discharging grit that comprises a medium grain fraction, and a finished material outlet for discharging finished material that comprises a fine grain fraction. The grinding installation may further include an open-loop/closed-loop control device for open-loop/closed-loop control of at least a part of a stream of material to the grinding apparatus. The present disclosure also concerns methods for comminuting material.

Attrition mills and propeller shaft assemblies therefor are described having features for enhanced installation and maintenance. Some embodiments include propellers having enhanced material processing characteristics.

A process for comminuting particles of heterogeneous material. The particles of heterogeneous material are fragmented and broken into smaller particle size by breaking them against each other. Heterogeneous material means two or more different solid materials or phases in the same solid. The component materials may have different specific gravity and/or hardness. In the process, a slurry of particles of heterogeneous material is pumped through an agitated mixture of impingement media, wherein the impingement media has a size greater than a size of the particles, wherein adjacent impingement media interact to create impingement zones through which the particles pass and impinge each other to cause the particles to fracture and break into smaller particles. The impingement media may be from 5 to 10 times larger than the particles. The impingement media may be harder than the particles. The heterogeneous material may be coal.

A generally cylindrical rotor (1) for an agitator mill is provided. The rotor has a rotor wall (11), a plurality of tools (13) attached to the rotor wall, a rotor separation ring (12), a rotor hub (14), and at least one connecting rod (15). The rotor (11) and the rotor separation ring (12) are clamped in the hub (14) by means of the connecting rods (15). The rotor separation ring (12) is designed as a rotationally symmetrical hollow cylinder. The rotor wall (11) is rotationally symmetrical with respect to an axis of rotation (19) and is mirror-symmetrical with respect to a plane of symmetry perpendicular to the axis of rotation. A mill comprising the rotor, a method for servicing the mill, and a stator assembly for use in a mill are also provided.

A generally cylindrical rotor (1) for an agitator mill is provided. The rotor has a rotor wall (11), a plurality of tools (13) attached to the rotor wall, a rotor separation ring (12), a rotor hub (14), and at least one connecting rod (15). The rotor (11) and the rotor separation ring (12) are clamped in the hub (14) by means of the connecting rods (15). The rotor separation ring (12) is designed as a rotationally symmetrical hollow cylinder. The rotor wall (11) is rotationally symmetrical with respect to an axis of rotation (19) and is mirror-symmetrical with respect to a plane of symmetry perpendicular to the axis of rotation. A mill comprising the rotor, a method for servicing the mill, and a stator assembly for use in a mill are also provided.

An apparatus for processing magnetite iron ore, including an upstream cyclone and a mill for grinding particles, wherein the upstream cyclone is arranged to operate as a splitter by diverting material in an overflow of the upstream cyclone to bypass the mill and by feeding material in an underflow of the upstream cyclone to the mill.

An apparatus for processing magnetite iron ore, including an upstream cyclone and a mill for grinding particles, wherein the upstream cyclone is arranged to operate as a splitter by diverting material in an overflow of the upstream cyclone to bypass the mill and by feeding material in an underflow of the upstream cyclone to the mill.

A method for the production of the present disclosure comprises: a) a step of agitating a mixture containing a material to be ground, beads and a dispersion medium in a bead mill; and b) a step of adjusting the pH of the mixture.

This method reduces a contamination caused by grinding process using a bead mill.

An agitator ball mill comprising a grinding chamber having a cylindrical wall, and further having a rotatably mounted agitator shaft extending into the grinding chamber and on which at least one agitator element is arranged inside the grinding chamber. The mill further comprises an inlet for supplying to the grinding chamber material to be ground and grinding bodies, an outlet for removal of the ground material, and an induction heater for the material to be ground located in the grinding chamber, the induction heater comprising an inductor and a susceptor. The at least one agitator element comprises a susceptor material which forms the susceptor of the induction heater, wherein the inductor comprises at least one coil which is arranged outside the cylindrical wall of the grinding chamber and encompasses the grinding chamber, and wherein the cylindrical wall of the grinding chamber consists of an electrically and magnetically non-conductive material.