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US-20260124622-A1 - BULK MATERIAL MILL FOR PROCESSING COARSE MATERIAL

US20260124622A1US 20260124622 A1US20260124622 A1US 20260124622A1US-20260124622-A1

Abstract

A method for processing a bulk material in a processing plant includes feeding bulk material into a grinding and separating device, grinding the bulk material into ground grinding stock, separating the ground grinding stock into fine material and coarse material and discharging the fine material from the grinding and separating device, discharging at least part of the coarse material from the grinding and separating device. The discharged part of the coarse material amounts to at least 65 percent by mass of the fed bulk material, and the discharged part of the coarse material is fed to a subsequent use. A processing plant for processing bulk material and a method of dedusting ore with a processing plant with a mill and classifier are also disclosed.

Inventors

  • Caroline Woywadt
  • York Reichardt

Assignees

  • GEBR. PFEIFFER SE

Dates

Publication Date
20260507
Application Date
20231005
Priority Date
20221006

Claims (17)

  1. 1 . A method for processing a bulk material ( 8 ) in a processing plant ( 1 ), comprising: feeding the bulk material ( 8 ) into a grinding and separating device ( 2 ), the grinding and separating device ( 2 ) comprising a grinding device ( 5 ) and a separating device ( 6 ); grinding the bulk material ( 8 ) in the grinding device ( 5 ) into ground grinding stock ( 23 )l separating the ground grinding stock ( 23 ) in the separating device ( 6 ) into fine material ( 12 ) and coarse material ( 13 ); discharging the fine material ( 12 ) from the grinding and separating device ( 2 ); and discharging at least part of the coarse material ( 13 ) from the grinding and separating device ( 2 ); wherein the discharged part of the coarse material ( 13 ) amounts to at least 65 percent by mass of the fed bulk material ( 8 ).
  2. 2 . The method for processing a bulk material according to claim 1 , wherein the fed bulk material ( 8 ) has at least a first phase and a second phase, wherein the coarse material ( 13 ) has a higher proportion of the first phase than the fed bulk material ( 8 ).
  3. 3 . The method for processing a bulk material according to claim 2 , wherein the first phase and the second phase have particles, wherein the particles of the first phase have on average a larger grain size than the particles of the second phase and/or the particles of the first phase have on average a higher density than the particles of the second phase.
  4. 4 . The method for processing a bulk material according to claim 2 , wherein the first phase has a different material than the second phase.
  5. 5 . The method for processing a bulk material according to one claim 1 , wherein a maximum grain size of particles in the fine material ( 12 ) is 0.1 millimeters,
  6. 6 . The method for processing a bulk material according to one claim 1 , wherein the discharged part of the coarse material ( 13 ) is at least 75 percent by mass of the fed bulk material ( 8 ).
  7. 7 . The method for processing a bulk material according to one claim 1 , wherein the separating device ( 6 ) is a rotary classifier.
  8. 8 . The method for processing a bulk material according to claim 7 , wherein a grain size distribution in the coarse material ( 13 ) is controllable or at least influenceable via a rotational speed of the rotary classifier.
  9. 9 . The method for processing a bulk material according to one claim 1 , wherein the bulk material ( 8 ) consists primarily of ore.
  10. 10 . The method for processing a bulk material according to one claim 1 , wherein the bulk material ( 8 ) consists primarily of concrete.
  11. 11 . The method for processing a bulk material according to one claim 1 , wherein the separating device ( 6 ) is a first separating device ( 6 ) and the discharged coarse material ( 13 ) is supplied to a second separating device ( 20 ), wherein the second separating device ( 20 ) divides the discharged coarse material ( 13 ) into at least two fractions with grain sizes and/or densities that differ from one another.
  12. 12 . A processing plant ( 1 ) for processing bulk material ( 8 ), comprising: a grinding and separating device ( 2 ) comprising a grinding device ( 5 ) and a first separating device ( 6 ), wherein the grinding device ( 5 ) is adapted to grind a fed bulk material ( 8 ) into ground grinding stock ( 23 ), and the first separating device ( 6 ) is adapted to separate the ground grinding stock ( 23 ) into fine material ( 12 ) and coarse material ( 13 ); a first discharge device ( 3 ) for discharging the fine material ( 12 ) from the grinding and separating device ( 2 ); a second discharge device ( 4 ) for discharging the coarse material ( 13 ) from the grinding and separating device ( 2 ); a control adapted to control the processing plant ( 1 ) such that a part of the coarse material ( 13 ) discharged via the second discharge device ( 4 ) is at least 65 percent by mass of the fed bulk material ( 8 ); and a second separating device ( 20 ), wherein the second separating device ( 20 ) is adapted to separate the discharged part of the coarse material ( 13 ) into at least a first fraction and a second fraction, wherein particles in the first fraction have on average a smaller grain size and/or lower density than particles in the second fraction.
  13. 13 . The processing plant for processing bulk material according to claim 12 , wherein the grinding and separating device ( 2 ) comprises a control unit ( 27 ), wherein the control unit ( 27 ) is configured to control a proportion of fine material ( 12 ) discharged via the first discharge device ( 3 ).
  14. 14 . A method for dedusting iron ore with a processing plant ( 1 ) with a mill and a classifier, the method comprising: discharging the iron ore predominantly as coarse material ( 8 ) from the processing plant ( 1 ) by a discharge device ( 4 ) arranged between the classifier and the mill; wherein the classifier is arranged above the mill.
  15. 15 . The method of claim 14 , further comprising dedusting the iron ore by discharging fine material ( 12 ).
  16. 16 . The method for processing a bulk material according to claim 1 , wherein the separating device ( 6 ) is arranged above the grinding device ( 5 ) and the discharging of the least part of the coarse material ( 13 ) takes place between the separating device ( 6 ) and the grinding device ( 5 ).
  17. 17 . The processing plant for processing bulk material according to claim 12 , wherein the second separating device ( 20 ) is adapted to separate the discharged part of the coarse material ( 13 ) into at least a first fraction, a second fraction and a third fraction, wherein the fractions on average have different grain sizes and/or densities with respect to each other.

Description

The present invention relates to a method for processing a bulk material in a processing plant, a processing plant for processing bulk material and the use of a processing plant with a mill and classifier for dedusting ore. Grinding and separating devices are a frequently used means of grinding and processing raw materials. A fed initial material is fed into the grinding device and comminuted into different fractions, for example fractions of different grain sizes. The different grain sizes are then separated in a separating device. Sufficiently finely ground fractions are discharged from the grinding and separating device in the form of fine material. Coarse fractions with grain sizes that are too large are rejected by the separating device and usually fed back to the grinding device, where they are ground again and thus comminuted further. This cycle is repeated until finally all of the fed initial material is discharged from the grinding and separating device in the form of fine material. Alternatively, part of the coarse material rejected by the separating device may be discharged and thus no longer fed to the grinding device. Discharging substances that are difficult to grind may, for example, increase the productivity of the grinding and separating device. The discharged coarse material is usually dumped or fed back into the grinding device at a later time. The discharged fine material has the desired, sufficiently fine grain sizes and is fed to a subsequent use. A method for processing multiphase mineral raw materials is known from EP 3 326 720 B1. A raw material fed to a mill is comminuted using grinding rollers. The ground raw material is then separated into fine material and coarse material in a classifier. The fine material is discharged from the plant. Part of the coarse material rejected by the classifier is discharged from the mill. The remaining coarse material is fed back to the grinding rollers and comminuted further until it is finally discharged from the plant in the form of fine material. The methods known in the prior art have in common that grinding stock is comminuted into a desired grain size and the comminuted grinding stock is then discharged from the plant in the form of fine material. The discharging of unwanted substances or phases that are difficult to grind may take place to a certain part via the coarse material discharge. However, the discharged grain sizes in the coarse material are difficult to control and adjust. In the present application, grain size is understood to mean the size of individual particles, also known as grains. The term particle is used in the present application as a synonym for grain. If the particles were perfect spheres, the grain size would represent a measure of the respective sphere diameter. However, since the particles are usually not perfectly spherical, but have different shapes, the grain size may be interpreted as an equivalent diameter. The object of the present invention is to efficiently and precisely separate unwanted substances and grain sizes from ground grinding stock and discharge them from a processing plant. This object is solved by a method for processing a bulk material according to claim 1, a processing plant for processing bulk material according to claim 12 or a use of a processing plant for dedusting ore according to claim 14. A method according to the present invention for processing a bulk material in a processing plant comprises feeding bulk material into a grinding and separating device, grinding the bulk material in a grinding device into ground grinding stock, separating the ground grinding stock in a separating device into fine material and coarse material, discharging the fine material from the grinding and separating device and discharging at least a part of the coarse material from the grinding and separating device. The discharged part of the coarse material from the grinding and separating device amounts to at least 65 percent by mass of the fed bulk material. The discharged part of the coarse material may be fed to a subsequent use. The grinding and separating device comprises the grinding device and the separating device. In technical terms, separating the ground grinding stock may also be referred to as classifying, grading or sorting. The discharged fine material may be dumped or sent to a landfill or to one or more separate further processing stages. For example, the fine material may be sent to a separate fine material processing stage. Alternatively or additionally, the fine material may be used as a filler. The fed bulk material may have at least a first phase and a second phase. The coarse material may have a higher proportion of the first phase than the fed bulk material. The coarse material may have a higher proportion of the first phase than the fine material. The fine material may have a higher proportion of the second phase than the coarse material. The fine material may have a higher proportion of th