# US 2008/0185318 A1 · Apparatus for Classifying Charge Material

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- Number: US 2008/0185318 A1
- Document ID: US20080185318A1
- Status: Published application
- Kind: A1
- Application number: 12/064,741
- Filed: 2006-08-25
- Published: 2008-08-07
- Earliest claimed: 2005-09-23
- Inventors: Ludwig Konning; Egbert Burchardt; Olaf Hagemeier; Franz-Josef Zurhove
- Web page: https://patentgrep.com/patent/US20080185318A1

## CPC

- B07B 9/02: Combinations of similar or different apparatus for separating solids from solids using gas currents
- B07B 4/08: while the mixtures are supported by sieves, screens, or like mechanical elements
- B07B: SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL (wet separating processes, sorting by processes using fluent material in the same way as liquid B03; combinations of dry separating apparatus with wet separating apparatus B03B; using liquids B03B, B03D; sorting by magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high voltage electric fields B03C; centrifuges or vortex apparatus for carrying out physical processes B04; hand sorting, postal sorting, sorting by switching or other devices actuated in response to detection or measurement of some feature of articles or samples of material B07C)

## Abstract

The invention relates to an apparatus for classifying charge material, comprising a static classifier which has a ventilating base oriented obliquely to the vertical and traversed by classifying gas; an inlet opening for charging the charge material to the ventilating base; an outlet opening for the coarse material; a downstream dynamic classifier which comprises at least one rotor; and at least one outlet opening for the classifying gas laden with fine material. The ventilating base has a ratio of width to vertical height of at least 0.45, preferably of at least 0.6.

## Claims

### Claim 1

Static-dynamic sifter for sifting (100) charge material, having
a. a static sifter (1) which has an aerating base (1a) oriented at an angle relative to the vertical and through which sifting gas (2) flows,
b. an inlet opening (3) for delivering the charge material (9) to the aerating base (1a),
c. an outlet opening (4) for the coarse material,
d. a dynamic sifter (5), located downstream, which comprises at least one rotor (5a), and
e. at least one outlet opening (6) for the sifting gas 2′ laden with fine material, characterised in that
the aerating base (1a) has a width (b) to vertical height (h) ratio of at least 0.45, preferably of at least 0.6.

### Claim 2 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that a device (101) for uniformly distributing the charge material over the width of the aerating base is also provided.

### Claim 3 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that disagglomerating means (102) are arranged upstream of the static sifter.

### Claim 4 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that the width of the rotor (5a) is different from the width of the aerating base (1a), and a housing transition portion is provided between the static and dynamic sifters.

### Claim 5 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that the surface of the aerating base (1a) is planar and is provided with aerating openings (1b).

### Claim 6 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that the aerating base (1a) is at an angle of from 20° to 70°, preferably from 30° to 60°, relative to the vertical.

### Claim 7 (depends on 1)

Static-dynamic sitter according to claim 1, characterised in that the aerating base (1a) is in such a form that it produces a pressure drop of from 2 mbar to 8 mbar, preferably from 3 mbar to 4 mbar.

### Claim 8 (depends on 1)

Static-dynamic sifter according to claim 1, characterised in that the aerating bases (1a) of devices within a line for different throughputs differ from one another only in terms of their width (b) and not in terms of their vertical height (h).

### Claim 9 (depends on 1)

Milling installation having a static-dynamic sifter according to claim 1 as well as a material bed roller mill.