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RU-2861682-C1 - INSTALLATION AND METHOD FOR GRINDING STARTING MATERIALS

RU2861682C1RU 2861682 C1RU2861682 C1RU 2861682C1RU-2861682-C1

Abstract

FIELD: grinding. SUBSTANCE: group of inventions relates to an installation for grinding starting materials and a method for grinding the above materials. The installation comprises a bead mill (3) with a feeding system (2) for feeding starting materials to be ground, and a classifying rotor (4) connected to the bead mill (3). The feeding system (2) and the classifying rotor (4) are located substantially horizontally relative to the longitudinal extension of the bead mill (3). The method consists of preparing and operating the bead mill (3) with the feeding system (2), as well as preparing and operating the classifying rotor (4) connected to the bead mill (3). The feeding system (2) and the classifying rotor (4) are placed in a substantially horizontal position relative to the longitudinal orientation of the bead mill (3), in which the installation is operated. EFFECT: increasing the energy efficiency of the grinding process. 12 cl, 2 dwg

Inventors

  • ROSEN ROBERT
  • KOLB GERHARD
  • BARTH CHRISTOF
  • COSTA XAVIER
  • MARTIN EVALDO

Dates

Publication Date
20260507
Application Date
20250529
Priority Date
20240606

Claims (15)

  1. 1. An installation (1) for grinding raw materials, comprising a bead mill (3) with a loading system (2) for loading raw materials to be ground and a classifying rotor (4) connected to the bead mill (3), wherein the loading system (2) and the classifying rotor (4) are arranged substantially horizontally relative to the longitudinal extent of the bead mill (3).
  2. 2. The installation (1) according to claim 1, in which the grinding bodies located in the bead mill (3) have a size of 1 to 10 mm, preferably 2 to 9 mm, preferably 3 to 8 mm, preferably 4 to 6 mm.
  3. 3. The installation (1) according to paragraph 1 or 2, in which the connection between the bead mill (3) and the classifying rotor (4) is realized with the formation of a closed circulation system for grinding and classifying.
  4. 4. The installation (1) according to item 3, in which the connection between the bead mill (3) and the classifying rotor (4) is additionally implemented with the formation of a circulating grinding and classification system operating using pneumatic transport of the material being processed.
  5. 5. The installation (1) according to one of the previous points, in which the bead mill (3) is designed to operate exclusively in dry grinding mode.
  6. 6. An installation (1) according to one of the preceding paragraphs, including means that ensure the possibility of continuously receiving a loaded volume of source material to be crushed, corresponding to the output volume of completely crushed source material.
  7. 7. An apparatus (1) according to one of the preceding claims, which provides a completely ground starting material, at least part of which has the following particle size distribution: from 4 to 6% of the particles have a size of less than 0.6 μm, preferably less than 0.4 μm, from 50 to 80% of the particles have a size of less than 3 μm, preferably less than 2 μm, and 98% of the particles have a size of less than 5 μm, preferably less than 4 μm.
  8. 8. A method for grinding raw materials, including:
  9. preparation and operation of the bead mill (3) with a loading system (2);
  10. preparation and operation of the classifying rotor (4) connected to the bead mill (3),
  11. wherein the loading system (2) and the classifying rotor (4) are located and operate essentially horizontally relative to the longitudinal orientation of the bead mill (3).
  12. 9. The method according to claim 8, in which the bead mill (3) is provided for its operation with grinding bodies having a size of 1 to 10 mm, preferably 2 to 9 mm, preferably 3 to 8 mm, preferably 4 to 6 mm.
  13. 10. The method according to claim 8 or 9, in which the bead mill (3) and the classifying rotor (4) are driven by maintaining the operation of a closed circulation grinding and classifying system with pneumatic transport of the material being processed, by means of which the not yet completely ground source material is directed along a closed circuit until it is finally ground.
  14. 11. The method according to one of paragraphs 8-10, in which the bead mill (3) is operated exclusively in dry grinding mode.
  15. 12. The method according to one of claims 8 to 11, which results in a completely ground starting material, at least part of which has the following particle size distribution: from 4 to 6% of the particles have a size of less than 0.6 μm, preferably less than 0.4 μm, from 50 to 80% of the particles have a size of less than 3 μm, preferably less than 2 μm, and 98% of the particles have a size of less than 5 μm, preferably less than 4 μm.

Description

Field of technology to which the invention relates The present invention relates to an apparatus for grinding raw materials, as well as to a corresponding method. State of the art Machines must be used to finely grind raw materials, i.e., grind them into powder, for the subsequent use of the raw materials prepared in this way in the production of the corresponding products. In addition to the time required for the grinding process, other labour resources such as skilled personnel, production space and energy costs are also required to achieve perfect quality results. One example from the film industry is the grinding of fillers, which are then used, for example, to produce films permeable to water vapor. Such vapor-permeable films are required, for example, for the production of diapers, nappies, and other liquid-absorbing personal hygiene products, and similar films are also used in the construction industry. Vapor-permeable films can be, for example, breathable polymer films, and, in addition to diapers, they can also be used in sanitary pads or, for example, in packaging films. Typical fillers used in the applications described above are generally based on some form of calcium carbonate with the following particle size distribution: 4 to 6% of the particles are less than 0.4 µm in size, 50 to 80% of the particles are less than 2 µm in size, and 98% of the particles are less than 4 µm in size. Such a filler is added, for example, to a plastic masterbatch (PE/PP film) to produce the final film. The goal is to achieve a steep particle size distribution with a low percentage of particles in the submicron range, below 0.4 µm. A low percentage of submicron particles reduces extruder viscosity and minimizes the need for coating agents. Furthermore, using a filler with a particle size distribution in which 4 to 6% of the particles are smaller than 0.4 µm, 50 to 80% of the particles are smaller than 2 µm, and 98% of the particles are smaller than 4 µm improves the permeability of the polymer film. This makes the film permeable to gases such as air. To improve the filler's quality and ensure its homogeneity during extrusion to produce a superconcentrate, the filler, i.e., the completely ground filler powder, is typically treated with stearic acid. This process is called coating. The prior art already includes methods that involve first producing a semi-finished product, which is obtained, for example, in vertical roller mills, pendulum roller mills, or impact mills. This semi-finished product can have a particle size distribution of less than 75 microns, with a small proportion of ultrafine particles smaller than 2 microns. This semi-finished product is then fed into wet-grinding bead mills, which feature vertical loading. In this case, the concentration of grinding media is set to the maximum value of 30-35% by weight. The operation of the bead mill is controlled, for example, to maintain the particle size distribution described above. To further use this product, it must be dewatered, dried, coated, and then deagglomerated. In most cases, this is followed by another step, in which the material is sieved to remove any hard agglomerates that may have formed. This material then undergoes a further coating step. This process is complex and requires a very large amount of energy in various forms. Depending on the type of calcium carbonate used (argonite, limestone, marble, calcite, etc.), the specific energy consumption for pre-crushing, grinding, and drying can reach up to 1,000 kWh/t. Disclosure of invention Taking into account the above, the present invention is based on the task of creating an installation that would allow the grinding process to be carried out with low energy consumption, i.e. in an energy-efficient manner. This problem is solved in an installation characterized by the features of paragraph 1 of the invention formula, as well as in a method characterized by the features of paragraph 8 of the invention formula. Accordingly, a setup for grinding feedstock materials is proposed. This setup includes a bead mill with a loading system for loading the feedstock to be ground and a classifying rotor connected to the bead mill. The loading system and classifying rotor are positioned essentially horizontally relative to the longitudinal orientation of the bead mill. The essentially horizontal orientation of the system components, i.e., the essentially horizontal layout of the system itself, allows for certain degrees of freedom, allowing a slight offset from the longitudinal direction to be considered acceptable for a stable production process. For example, a deviation of up to 20° relative to the longitudinal direction may be considered acceptable. An angle of up to 20°, for example an angle in the range of 5° to 20°, preferably 10° to 20°, and preferably 15° to 20°, offers the advantage of creating a system with particularly high design flexibility, as such a system can be reliably combined with a wide v