EP4584025A1 - Elektrostatischer sichter in der mechano-chemischen aktivierung - Google Patents
Elektrostatischer sichter in der mechano-chemischen aktivierungInfo
- Publication number
- EP4584025A1 EP4584025A1 EP24783263.7A EP24783263A EP4584025A1 EP 4584025 A1 EP4584025 A1 EP 4584025A1 EP 24783263 A EP24783263 A EP 24783263A EP 4584025 A1 EP4584025 A1 EP 4584025A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlet
- mill
- fraction
- separation
- separation device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
Definitions
- the invention relates to a method using an electrostatic classifier in mechano-chemical activation for separating the activated fraction.
- Activated clays have established themselves as an additive, particularly in the cement industry.
- the current method is drying and calcining the clays, i.e., thermal activation. This requires energy for heating, and the high temperature can also cause further, potentially undesirable, changes in the material.
- the thermal process often requires flue gas purification, for example, to capture the resulting nitrogen oxide and sulfur oxide emissions.
- the thermal process will require the use of processes to capture and, if necessary, purify the carbon dioxide produced or released.
- the activity index describes the ratio (in %) of the compressive strengths of standardized mortar prisms tested at the same age, which contain a mass fraction of 75% test cement and a mass fraction of 25% cement aggregate, and standardized mortar prisms produced exclusively with test cement.
- the test cement used is a Portland cement (type CEM I) with a strength class of 42.5 or higher.
- the cement aggregate (supplementary cementitious material, SCM) to be evaluated can be less or more powerful than the test cement.
- high-performance SMCs such as granulated blast furnace slag can also achieve activity values of more than 100 up to about 120. If the activity index is more than 100, this means that the clinker content in the binder can be further reduced, namely by exactly the amount necessary to achieve an activity index of 100.
- the clinker content is usually replaced by an inert, finely ground filler such as limestone, which is considerably cheaper to produce than clinker. Therefore, so-called mechanochemical activation through intensive grinding is increasingly being discussed.
- the process of mechanochemical activation can be used to produce cement aggregates that can optionally replace other secondary cementitious materials, i.e., SCMs.
- SCMs possess pozzolanic, latent hydraulic, or even hydraulic properties, allowing these materials to contribute to the strength development when the finished binder is mixed with water. Inert materials such as limestone do not exhibit this additional strength development when mixed with water.
- a cement additive made from old concrete is known from the subsequently published DE 10 2023 123 525.
- mechanochemical activation is that even clays with a lower kaolin content, which are not suitable for thermal activation, can be mechanochemically activated. This broadens the available raw material base.
- EP 1 888 243 B1 discloses a device for producing dispersed mineral products.
- the initial crystal structure, as well as the bond type and oxidation states of atoms, are altered due to high energy transfer and subsequent chemical reactions.
- the transition from the first stage to the second stage, which is necessary for the mechano-chemical activation is avoided in normal grinding, where only the creation of surfaces is expected.
- a third stage can be reached, in which an increase in particle size can be observed again due to the agglomeration of nanoparticles (agglomeration zone), which has a positive effect on the workability of activated clay-cement concrete. This area is therefore much more likely to be avoided, since a better result in terms of particle size distribution can be achieved with less effort.
- the key is separation in an electrostatic classifier rather than, as previously, in a size-selective separation device. This allows the different charge behavior of the activated and non-activated particles to be utilized to separate them and thus obtain a pure activated fraction.
- Mechanochemical activation in a mill results in electrostatic charging of the activated particles in the mill, which can then be separated in the electrostatic classifier. This creates a synergistic effect between the mechanochemical activation in step a) and the separation in step c).
- the device comprises a second separation device.
- the second separation device is a size-selective separation device.
- a size-selective separation device are a normal sifter, a cyclone, or a sieve.
- Such a size-selective separation device serves to separate a material stream into a coarse fraction (for example, on top of the sieve) and a fine fraction (below the sieve).
- Each size-selective separation device has a different separation size and separation efficiency, so that in principle It cannot be said what is coarse or fine, but in a specific case with a specific size-selective separation device, this is unambiguously and immediately clear.
- the second separation device has a fine outlet and a coarse outlet. The fine outlet discharges the fine fraction, and the coarse outlet discharges the coarse fraction.
- the second separation device is located downstream of the first separation device in the material flow.
- the first outlet of the first separation device is connected to the second separation device.
- the coarse outlet is connected to the product outlet.
- the fine outlet is connected to the material inlet of the mill. This material is therefore returned as not yet sufficiently activated.
- the basic design is shown in Fig. 1.
- the material to be activated is introduced into the mill 10 via the material inlet 12 and is ground there so intensively that mechano-chemical activation occurs, for example with an energy input of 600 kWh/t.
- the activated material leaves the mill 10 via the material outlet 14 and is transferred to the first separation device 20, an electrostatic classifier.
- a separation into charged and uncharged particles takes place.
- the charged particles leave the first separation device via the first outlet and are fed as a finished activated product to the product outlet 30, which can be, for example, a silo, a filling station, or the transfer point to another system.
- the uncharged, not yet activated particles leave the first separation device 20 through the second outlet 24 and are fed back to the material inlet 12 of the mill 12 via the return line 40.
- Fig. 2 and Fig. 3 show the combination of a first separation device 20 in the form of an electrostatic separator with a second separation device 50 in the form of a size-selective separation device, for example, a cyclone. For simplicity, only the differences from the basic design will be discussed below.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU505652A LU505652B1 (de) | 2023-11-29 | 2023-11-29 | Elektrostatischer Sichter in der mechano-chemischen Aktivierung |
| DE102023133380.1A DE102023133380A1 (de) | 2023-11-29 | 2023-11-29 | Elektrostatischer Sichter in der mechano-chemischen Aktivierung |
| PCT/EP2024/077664 WO2025113853A1 (de) | 2023-11-29 | 2024-10-02 | Elektrostatischer sichter in der mechano-chemischen aktivierung |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP4584025A1 true EP4584025A1 (de) | 2025-07-16 |
| EP4584025C0 EP4584025C0 (de) | 2025-08-20 |
| EP4584025B1 EP4584025B1 (de) | 2025-08-20 |
Family
ID=92966488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24783263.7A Active EP4584025B1 (de) | 2023-11-29 | 2024-10-02 | Elektrostatischer sichter in der mechano-chemischen aktivierung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4584025B1 (de) |
| ES (1) | ES3040764T3 (de) |
| WO (1) | WO2025113853A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005023950B4 (de) | 2005-05-20 | 2007-08-02 | Omya Gmbh | Anlage zur Herstellung disperser mineralischer Produkte |
| DE102023106217A1 (de) | 2023-03-13 | 2024-09-19 | Celitement GmbH & Co. KG | Mechanische Aktivierung von Tonen |
| DE102023106222A1 (de) | 2023-03-13 | 2024-09-19 | Celitement GmbH & Co. KG | Farboptimierung bei der mechanischen Aktivierung von Tonen |
| DE102023123525A1 (de) | 2023-03-13 | 2024-09-19 | Thyssenkrupp Ag | Zementzusatzstoff aus Altbeton |
| DE102023106221A1 (de) | 2023-03-13 | 2024-09-19 | Celitement GmbH & Co. KG | Kombinierte mechanische und thermische Aktivierung von Tonen |
| DE102023106210A1 (de) | 2023-03-13 | 2024-09-19 | Celitement GmbH & Co. KG | Mechanische Aktivierung von Tonen |
-
2024
- 2024-10-02 ES ES24783263T patent/ES3040764T3/es active Active
- 2024-10-02 EP EP24783263.7A patent/EP4584025B1/de active Active
- 2024-10-02 WO PCT/EP2024/077664 patent/WO2025113853A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2025113853A1 (de) | 2025-06-05 |
| EP4584025C0 (de) | 2025-08-20 |
| EP4584025B1 (de) | 2025-08-20 |
| ES3040764T3 (en) | 2025-11-04 |
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