Grinding mill

Patent metadata

Field	Value
Publication number	US-9630214-B2
Application number	US-201314435064-A
Country	US
Kind code	B2
Filing date	Oct 9, 2013
Priority date	Oct 10, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Disclosed is a grinding mill including a roller press configured to comminute grinding stock, a first conveying mechanism in communication with the roller press and configured to transport downstream at least one of fresh grinding stock or grinding stock comminuted by the roller press, and a static sifter disposed downstream of the first conveying mechanism and configured to sift at least one of the fresh grinding stock or grinding stock comminuted by said roller press. The static sifter includes a sifting stock inlet disposed in an upper sifting space, and sifting gas inlet disposed in a lower sifting space, and an aeration plate separating the upper sifting space from the lower sifting space. The aeration plate also permits sifting gas to pass there through from the lower to the upper sifting space. The static sifter also includes oversized material outlets disposed in each of the respective upper and lower sifting spaces.

First claim

The invention claimed is:

1. A grinding installation, comprising:
a roller press having two counter-rotating grinding rollers and configured to comminute grinding stock;
a first conveying mechanism in operative communication with said roller press and configured to transport at least one of fresh grinding stock or the grinding stock comminuted by said roller press downstream; and
a static sifter disposed downstream of and in operative communication with said first conveying mechanism and configured to sift the at least one of the fresh grinding stock or grinding stock comminuted by said roller press, said static sifter having,
a sifting stock inlet disposed at a side of said sifter that is oriented toward said first conveying mechanism, said sifting stock inlet configured to accept at least one of fresh grinding stock or grinding stock comminuted by said roller press that has been conveyed to said sifter by said first conveying mechanism,
a sifting gas inlet disposed at a side of said sifter that is oriented away from said first conveying mechanism, said sifting gas inlet configured to permit sifting gas to flow into said sifter,
an aeration plate disposed within said sifter between each of said sifting stock inlet and said sifting gas inlet and at an angle to a horizontal plane, said aeration plate defining a first upper sifting space disposed above said aeration plate into which upper sifting space said sifting stock inlet opens and a second lower sifting space disposed below said aeration plate into which lower sifting space said sifting gas inlet opens, said aeration plate configured to permit sifting gas to flow from said sifting gas inlet in said second lower sifting space, through said aeration plate, and into said first upper sifting space so as to mix sifting gas with grinding stock conveyed through said sifting stock inlet into said first upper sifting space,
a first oversized material outlet disposed in said first upper sifting space and in operative communication with said roller press, said first oversized material outlet configured to permit the removal of oversized material from said upper sifting space such that the oversized material can be conveyed back to said roller mill to be further comminuted,
a second oversized material outlet disposed in said lower sifting space and configured to permit the removal of oversized material from said lower sifting space, and
a fine material outlet disposed in said first upper sifting space.

2. The grinding installation of claim 1 , wherein an angle between the orientation of the sifting stock inlet and that of the sifting gas inlet is at between 15° and 345°.

3. The grinding installation of claim 1 , wherein said first conveying mechanism is a vertical conveying mechanism.

4. The grinding installation of claim 3 , wherein said vertical first conveying mechanism is one of a bucket elevator or inclined belt elevator.

5. The grinding installation of claim 1 , wherein said first conveying mechanism has a lower end and an upper end, wherein said upper end of said first conveying mechanism is in operative communication with said sifting stock inlet of said sifter by a chute disposed there between.

6. The grinding installation of claim 1 , wherein said first conveying mechanism has a lower end and an upper end, wherein said upper end of said first conveying mechanism is in operative communication with said sifting stock inlet of said sifter, and wherein said lower end of said first conveying mechanism is in operative communication with each of said roller press and a fresh material feed.

7. The grinding installation of claim 6 , further comprising a first conveying device, wherein said lower end of said first conveying mechanism is in operative communication with a first end of said first conveying device, and each of said roller press and said fresh material feed are in operative communication with a second opposing end of said first conveying device, said first conveying device configured to transport the grinding stock from said respective roller press or fresh material feed to said first conveying mechanism.

8. The grinding installation of claim 1 , wherein said second lower sifting space includes an inclined bed, at a lower end of which inclined bed is disposed said second oversized material outlet.

9. The grinding installation of claim 1 , further comprising a dynamic sifter coupled to said fine material outlet of said static sifter, said dynamic sifter configured to accept a mixture of fine material and sifting air received from said static sifter through said fine material outlet.

10. The grinding installation of claim 9 , wherein said static sifter and said dynamic sifter are housed in a common sifter housing.

11. The grinding installation of claim 9 , further comprising a separation device disposed downstream of, and in operative communication with, said dynamic sifter.

12. The grinding installation of claim 1 , further comprising a second conveying mechanism in operative communication with each of said first and second oversized material outlets and said roller press, and configured to convey oversized material from said first and second oversized material outlets back to said roller mill to be further comminuted.

13. The grinding installation of claim 12 , wherein said second conveying mechanism has
a lower end in operative communication with said first and second oversized material outlets of said static sifter, and
an upper end in operative communication with said roller press, by a second conveying device disposed there between.

14. The grinding installation of claim 13 , further comprising a metal ejection device disposed along said second conveying device in a region of said second conveying device leading to said roller press.

15. The grinding installation of claim 1 , wherein a width of said first conveying mechanism is substantially equal to a width of said sifting stock inlet of said static sifter.

Assignees

• Thyssenkrupp Resource Tech Gmbh
• Thyssenkrupp Ind Solutions Ag

Inventors

• Hagemeier Olaf
• Haack Aimo Dirk

Classifications

• B02C23/12

  with return of oversize material to crushing or disintegrating zone · CPC title

• B02C21/005

  the roller mill having cooperating rollers · CPC title

• B07B7/01

  using gravity · CPC title

• B07B4/02

  while the mixtures fall · CPC title

• B02C4/02

  with two or more rollers · CPC title