DD298886A5 - INTERIOR CLADDING FOR TUBE BALL MILLS - Google Patents

Abstract

The invention is characterized in that in the radial mill plane conical Klassiermahlplatten with levers alternating with conical Klassiermahlplatten flat surface are used soz in different, equally long Mahlbahnabschnitten A1 with i5 along the grinding path after Rna2n1 with adM 1.6 and 5n1 calculated * conical Klassiermahlplatten with levers (1 or 2) arranged helically or parallel to the axis in the cylinder, with A1: n5 or 4 or 3 or 2 {conical grinding plates, conical; with levers or flat surface; Rollmahlplatten; Mahlbahnabschnitte; *}

Description

Non-classifying armor such as step or stair grinding plates, bead grinding plates with at least one lifting bar and also the rolling grinding plates according to OD 154425 or DD 281298 in short and long grinding spaces of tubular ball mills lead to an efficiency-reducing misclassification of the grinding media.

It took more than 20 years before the basic idea of the DR Patent No. 462188 with reasonable risk found a broader technical realization and in the correct interpretation of conical Klassiermahlplatten under the respective boundary conditions, which is still a problem, to a reduction of the specific electrical energy demand for former mill diameters of d _M <2.4m up to 15%.

There have been many attempts to control the Mahlkörperklassierung safely by different grinding surface design, which has not succeeded until today, especially by the increase in the mill diameter up to ά, _Λ = 6m. Klassiermahlplatten known design are known as conical, rising in Mahlguthewegungsrichtung stages DRP 462188 and different inclination DE-OS 2010215, with corrugated grinding track DE-PS 976312, with special forms of Mahlbahnfläche DE-PS 1187896, with straight or inclined to the mill axis continuous ribs DD PS 55893 or with Teilberippung DD-PS 229310, as well as on cylindrical Mahlbahnflächen parallel to the mill axis arranged lifting bars whose height decreases towards Mühlenaustrag steadily (DD / PS 228462) formed.

The classifying effect triggered by the conical grinding track is attributed to the centrifugal force, rebound and embankment effect. According to a unified view, the success of grinding media classification is decided in the classification zone of the moving grinding media milligrams.

The centrifugal effect is due to a strong lifting effect of the armor, i. aine along the grinding path uniformly strong cataract action of the grinding balls triggered. For this, the conical Klassiermahlplatten are provided with lifting strips. The state of the art in the GDR are the conical Klassiermahlplatten with lifting strips 1 according to DD 55893 with Konuswinke ,, i up to 14 ° in a two Mahlplattenringe, d. H. 500mm length, led conicity.

In the likewise known corner spiral armor (AT 332199), the cataract effect of the grinding balls required for the centrifugal force effect is achieved by the segmental rotation of the square grinding track.

A disadvantage is that the strong cataract effect of the grinding media required for the centrifugal force effect is very energy and wear-intensive and, according to our own investigations, is technologically unfavorable in fine grinding spaces. Thus, it could be demonstrated that when using the roll armor according to DD 154425 in Feinmahlraum a continuous cement mill instead of conical Klassiermahlplatten with lifting strips (1), the power requirement of the grinding chamber can be reduced by 25%. However, with the roll armor due to the lack of Klassierwirkung, even with the use of a monodisperse ball filling to avoid at least one misclassification, the problem of Mahlgutagglomeration not be controlled.

The rebound and the embankment effect for grinding media classification results from the conical design of the grinding path.

The disadvantage of this is that the practiced design of the conical Klassiermahlplatten with levers with cone angles up to 14 ° about 2 Mahlplattenringe (1) and up to 20 ° on a Mahlplattenring (2) makes very hclie armor inserts required.

Even higher are the inserts in the Eckspirapanzerung, where on top of that still up to 8 different types of grinding plates are required.

A disadvantage of all previously known Klassiermahlplatten is that at length-diameter ratios of l / d <1.6 of the grinding cavities fails any Mahlkörperklassierung.

Another disadvantage is that the effectiveness of Mahlkörperklassierung in the practiced form of armor decreases with increasing mill diameter. With mill diameters dM> 3.2m, the classifying effect is in need of improvement and in some cases resembles only a prevented misclassification.

Object of the invention

The aim of the invention is preferably to achieve a stable Mahlkörperklassierung in long grinding spaces of tubular ball mills, resulting in an increase in throughput, a decrease in power consumption, a significant reduction of the specific electric energy demand and a reduction of Mahlkörper- Mahlplattenverschleißes and the armor feed mass.

Explanation of the essence of the invention

The invention is based on the object, preferably in long Feinmahlräumen of tubular ball mills with length-diameter ratios of l / d> 1.6, in which conical Klassiermahlplatten with inclined (1) or axis-parallel lifting strips (2) for classifying the different grinding media diameter along the Are present, by a certain arrangement of the existing conical Klassiermahlplatten with levers (1 or 2), conical Klassiermahlplatten with flat surface (3 or 4), otherwise the same taper and Mahlplattenlänge over which the taper is guided and Rollmahlplatten (5 or 6), whose grinding surface is provided with radially encircling profiles, to achieve an improvement of the Klassierwirkung the mill armor while reducing the power requirement. Through an increase in throughput, as a result of the improved grinding media classification, and the power demand reduction, the specific workload of tubular ball mills in continuous flow and circulation grinding is to be significantly reduced. In addition, a reduction of Mahlkörper- Mahlplattenverschleißes and the armor feed compound is sought. This object is achieved according to the invention in that in the radial mill plane, i. in Mahlplattenring, conical Klassiermahlplatten with levers (1 or 2) alternating with conical Klassiermahlplatten with a flat surface (3 or 4) are used so that in different, equally long Mahlbahnabschnitten A, with i <"5 along the grinding path

after R _n = a · 2 """'with a = - ^ - and5 ^ η <1

1.6

calculated "R _n " series Conical Klassiermahlplatten with lever strips (1 or 2), which are arranged in a screw-like or axially parallel in the mill cylinder, with

Ai: n = 5 or 4 or 3 or 2 A2: n = 4 or 3 or 2 or 1 A ₃ In = 3 or 2 or 1 A «: n = 2 or 1 A ₆ In = I

along the grinding path decrease successively, as long integers for R _n , which allow a symmetrical distribution in Mahlplattenring result, and that Mahlbhnendende in section Ai +1, the Mahlbahnlänge A _{1 +} 1 <3 Ai, the arrangement of Rollmahlplatten ( 5 or 6).

The inventive coupling of conical Klassiermahlplatten with lifting levers; (1 or 2) with those with a flat surface (3 or 4), and Rollmahlplatten (5 or 6) ensures that the cataract action of the grinding body triggering lifting effect of the armor along the grinding path from Mahlbahnabschnitt A _L to section A). + _t determinate decreases. The lifting action of the inner lining is only from the conical Klassiermahlplatten with lifting strips (1 or 2), which are arranged in "R _n " rows in the mill cylinder helical or paraxial and in the Mahlbahnabschnitten A, with the Mahlbahnlänge successively decrease, aus Minimizing the lifting effect of the inner lining at the end of the grinding path are used in the grinding path section A | ₊₁ Rollmahlplatten (5 or 6).

The inventively set slope of the cataract effect of the grinding media or the potential energy of the Mahlkörperschüttung from Mahlbahnanfang to end triggers by different shock pulses of the grinding media in the individual Mahlbahnabschnitten a very strong Klassierimpuls. As a result, the grinding bodies with the largest mass or with the largest diameter to the Mahlbahnanfang, ie classified in the Mahlbahnabschnitt A ₁ with the highest potential energy of the Mahlkörperschüttung and on the other hand, the grinding media with the smallest diameter to the Mahlbahnende in the section Ai +1 with the lowest displaced potential energy.

The inventive use of Rollmahlplatten (5 or 6) at the Mahlbahnende a completely new dimension in the lifting gradient of the inner lining is achieved.

The Klassierimpuls triggered by the slope of the potential energy of Mahlkörstellschüttung is in the same direction as that of the conical inner lining, in the Klassierwirkung but clearly exceeds the effectiveness of the conical Klassiermahlplatten with levers in the practiced form with cone angles up to 14 ° in a guided over two Mahlplattenringe taper ( 1) or up to 20 ° for a Mahlplattenring (2).

The co-directional superimposition according to the invention of the two classifying effects leads to a significantly improved classifying effect of the inner lining, even with large diameters of the tubular ball mills of d * t> 4.0 m, and opens up the possibility of classifying grinding media in mill spaces of tubular ball mills with l / d ratios <1.6. The improvement of the grinding media classification according to the invention leads to throughput increases of up to 10%.

The invention is characterized in that the conical Klassiermahlplatten with lever strips (1 or 2) by Stufenmahlplatten (7) or non-conical grinding plates with at least one lever bar and the conical Klassiermahlplatten with flat surface (3 or 4) by Rollmahlplatten (5 or 6) or non-conical, smooth grinding plates can be replaced, which means that can be dispensed with the Klassierwirkung the conical grinding path.

By a surprising effect when retrofitting an operating mill, it was possible to quantify that the classifying effect resulting from the potential energy gradient of the grinding media bed based on the rolling armor at the end of the grinding bed is much stronger than that caused by the centrifugal, rebounding and embankment effect of the conical classifying grinding plates , It follows that a stable Mahlkörperklassierung can be achieved by the inventive, determined slope of the lifting action of the inner lining along the grinding path alone, without the conical design of the grinding path, wherein according to claim 1 according to the invention, the same direction superimposition of both Klassiereffekte, especially in tubular ball mills with large Diameter of d _M > 3.2 m, ensuring the best classification results. ^It is also essential to the invention that in the extreme case at the beginning of the Mahlbahn in section A ₁ the continuous use of Stufenmahlplatten (7), in the Mahlbahnabschnitt A _2, the continuous use of conical Klassiermahlplatten with lifting strips (1 or 2) and at the Mahlbahnende in the Mahlbahnabschnitt A3 the continuous use of Roll milling plates (5 or 6) with grinding path lengths of A ₂ <? Ai and A ₃ <4A ₁ takes place.

It is also characteristic that in extreme cases the Rollmahlplatten (5 or 6) in Mahlbahnabschnitt A ₁ +, be replaced at the Mahlbahnende by conical Klassiermahlplatten with a flat surface (3 or 4).

The use of Stufenmahlplatten (7) instead of conical Klassiermahlplatten with lifting strips (1 or 2) is particularly useful at the Mahlbahnanfang in section A ₁ , since the Stufenmahlplatten (7) due to their in the radial. Mahlbahnring rising grinding surface, which triggers the required lifting action of the inner lining in a compact form, are the best wear in this Mahlbahnabschnitt with the strongest cataract effect of there classified largest balls.

In exchange for the conical Klassiermahlplatten with lifting strips (1 or 2) for the middle Mahlbahnabschnitte A ₂ offer themselves as non-conical grinding plates with lifting strips referred to as Doppelwulstmahlplatten grinding plates with two paraxial lifting strips.

In contrast to the flat surface conical burrs (3 or 4), the buffing plates (5 or 6) offer advantages over smooth, non-conical burrs due to less lifting action due to given rolling friction.

In the state-of-the-art complete cladding of fine grinding spaces of tubular ball mills with 1 / d> 1.6 with conical Klassiermahlplatten with planing bars (1 or 2) are up to 25% of required for the Feinmahlraum lent power requirement for the triggered by the lifting strips cataract effect animal Mahlkcgeln needed. This proportion is reduced in the inventive arrangement of different Mahlplattenarten with the reduction of

Number of conical classifying plates with lifting strips (1 or 2) or grinding plates with lifting effect in the "R _n " series up to 80%, so that up to 25% · 0.8 = 20% of the power consumption of the fine grinding chamber of electrical energy saved The constant decrease of the impact load of the grinding media with the grinding path length of the fine grinding chamber leads to further technological advantages in the form of lower heating and agglomeration tendency of the material to be ground and reduction of Mahlplatten- and Mahlkörperverschleißes up to 30%.

The partial replacement of the conical Klassiermahlplatten (1 to 4) with their large insert mass, due to the conical design of the grinding path through Rollmahlplatten (5 or 6) leads to the reduction of the total armament feedstock of Feinmahlraumes up to 10%, d. H. Significant savings on high-chromium-alloy cast steel. In two embodiments, the solution according to the invention will be explained in more detail.

Exemplary embodiment 1

The fine grinding chamber of a two-chamber continuous cement mill 0 3.2 m × 15 m is according to the prior art for Mahlkörperklassierung uniformly with conical Klassiermahlplatten with lifting strips 1 armored.

The clear Mahlbahnlänge the Feinmahlraumes is 10.75 m and the mean, clear Mahlraumdurchmesser 3.08 m, so that a length-diameter ratio of 1 / d ~ 3.5 is given.

The refining plates are in n-division, i. maximum radian measure of each grinding plate of 314mm, executed, whereby 32 pcs.

Grinding plates in the ring (rows) and given ring number of 43 pieces. a total of 1376pcs. Grinding plates are arranged.

The conical Klassiermahlplatten 1 have a cone angle of 7 degrees, the conicity is in each case over 2 plate rings, so that it is used with two Mahlplattenarten different step height. Uniform for both types of plates is the arrangement of a continuous over both grinding plates lever bar, which is inclined by 8 degrees to Mühlenlachssso according to DD 55893. The plating of Feinmahlraumes is consistently uniform, since in addition to the conicality of the grinding plates to trigger the rebound and embankment effect along the entire grinding path uniformly strong cataract action of the grinding balls, initiated by the lifting strips, is required to reach the centrifugal force.

In the pulverising room of this mill are highly wear-resistant cast grinding balls with d _K = 60mm, 50mm, 40mm, 35mm, 30mm, 25mm, 23mm, 20mm, 18mm, 16mm, 14mm and 12mm in use.

The classification effect of the armor was quantified by measuring the distribution of grinding ball diameters along the grinding path.

in the new state of the grinding ball filling with a clear spherical shape of the grinding media was a good classification effect recorded, which has deteriorated significantly with increasing operating time of Mahlkugelfüllung and given loss of shape of the grinding balls in the form of flattening.

The described continuous cement mill produces a cement of grade PZ1 / 45 at a Siebrückstand at 90μπι of RmMm <5% or specific Blaine surfaces between 3200cm ² / g and 3500cm ² / g. The annual average of the throughput is approx. 43t / h, the power requirement of the mill main drive is approx. 155OkW, of which approx. 11GOkW is accounted for by the fine grinding room and the specific work requirement is approx. 36kWh / t.

The fine grinding room of the mill is converted according to the invention. For this purpose, in the grinding track sections A,

after R "= a-2 ⁿ "'

the number of rows of conical grinder plates with bars 1 R _{n is} calculated, whereby for the given mill with <jm = 3.2 m the factor a increases

a = - ^ - = 2

 1.6

Since there is already a classification of the grinding ball, albeit not good, the maximum possible gradient of the lifting effect of the armor is not superimposed with η = 5 in A, but with η = 4 in A ₍ it follows

Mahlbahnabschnitt η Rows 1 Rows 3 A, R _n kon. Klassiermahlplatten without Pcs. Lifting bars (32-R _n ) Pcs. A ₁ 4 16 16 A ₂ 3 8th 24 A ₃ 2 4 Γ; 8 A ₄ 1 2 30

Since R _n = 2 in A ₄ yields the last integer that can be distributed symmetrically in the grinding plate ring, i = 4 is chosen. For the given armor, where the conicity passing over 2 rings each has to be considered, the following is chosen:

A, to A ₄ = 2.0 m A ₅ = 2.75 m

This results in the distribution of the different types of grinding plates illustrated in FIG. 1 with a helical arrangement of the R _n rows in the miller cylinder.

A ₁ length grinding plates conical classifier Rollmahl- rings grinding plates Platton with1 without3 5oder6 lifters m Pcs. Pcs. Pcs. Pcs. A ₁ 2.0 8th 128 128 0 A ₂ 2.0 8th 64 192 0 A ₃ 2.0 8th 32 224 0 A ₄ 2.0 8th 16,240 0 A ₆ 2.75 11 0 0 352 10.75 43 240 785 352

In order to minimize the lifting effect of the armor at the end of the grinding path, the rolling armor with the geometry of the radially encircling profiles according to DD 154425 (FIG. 1, 6) or DO 281298 (FIG. 1, 5) is used in section A5. In addition to the energetic advantages of this Pbnzerungsart by almost complete suppression of the cataract effect of the grinding balls can be with their use at the Mahlbahnende positive influence the material transport speed in Mahlbugelfüllungen sized along the grinding path by a delay. From this point of view, the profile geometry according to DD 281298 (Figure 1, 5) is to be preferred. The proportion of the lifting effect of the armor is compared to the initial state with the number of conical

240

Klassiermahlplatten with lifting strips of 1376Stck. on 240 pieces, i. to ~ 100 ~ 18%, giving ~ 82% of the

1376

previously given K? taraktwirkung the grinding balls is omitted. This allows the power requirement of the fine grinding room up to

Pmk2 = 115OkW · 0.25 0.82 235kW

be lowered and at the same time be significantly improved by the superimposed gradient of the lifting effect of the armor from the start of the grinding path to the end of the grinding media classification.

With a usual time utilization of the grinding plant in the calendar year of ~ 60%, the following electrical energy savings are possible:

from power demand reduction: from throughput increase:

up to 1400 000 kWh / a up to 90000OkWhZa

As' .viere Vortoile arise:

- Reduction of grinding ball wear in the fine grinding room up to 30%.

- Reduction of the application mass of the armor in the fine grinding room by about 7%, which means a saving of about 3.5 tons of high-chromium-alloyed cast steel.

Exemplary embodiment 2

The fine grinding chamber of a SZM 4.4 mx 15 m Classifier Cement Mill, which operates in circulation with a USZ 5000 cyclone air recirculation classifier, has a clear grinding path length of 10.0 m and the mill tube a clear diameter of 4.4 m. Given the n-pitch of the refining plates, 44 refining plates (rows) are arranged per ring. With a standard grinding plate length of 250mm, 40 grinding plate rings and a total assembly of the grinding chamber with 44cl. Χ 40p. = 1760Sick. Grinding plates given.

According to the state of the art, the fine-particle space with a length-diameter ratio of 1 / d = 10.0 m /

4.28m ~ 2.3 uniformly armored with conical Klassiarmahlplatten with lifting ledges. ^

As the grinding media classification becomes more and more difficult as the diameter of the mill increases, the conical classifying grinding plates 1 have a cone angle of 12 degrees even in various mills of 14 degrees. Identical to the first example, the tapering over two grinding plate rings and the continuous arrangement of the lifting strips are on both grinding plate stages.

It is a polydisperse grinding media aggregate of highly wear-resistant grinding balls with diameters of dy = 50mm, 40mm, 35mm, 30mm, 25mm, 23mm and 20mm in use.

Despite the large conicity of the refining plates and the reduction of the Mahlkörperfüllungsgrades of originally 30% to 24%, the grinding media classification is unsatisfactory.

The average throughput of the grinding plant is about 90t / h in the production of different types of cement, the power requirement of the mill main drive is about 340OkW, of which about 240OkW is attributable to the fine grinding room, and the specific workload is about 38 kWh / t.

To improve the result of the grinding plant, the pulverizing space is converted according to the invention:

The number of rows R _n of conical Klassiermahlplatter with lifting strips 1 in the Mahlbahnabschnitten A ₁ is after

R _n = a-2 ""'with

1.6 1.6

calculated and at the Mahlbahnanfang in section A ₁ , if the difficulty of Mahlkörperklassierung with large mill diameter with η = 5 started.

A, η Rr. 44-R _n Pcs. Pcs. A ₁ 5 44 O A ₂ 4 22 22 A ₃ 3 11 33

Due to the complete assembly of the section A ₁ with conical Klassiermahlplatten with lifting strips 1 the maximum possible lifting effect of the armor and thus cataract effect of the grinding balls is set at the Mahlbahnanfang. Since in A ₁ at η = 3 with R _n = 11 the last integer results, i = 3 is chosen. Thus, for the division of the M & hlbahnabschnitte according to claim 1 results:

Ai = A ₂ = A ₃ = 2.0m A, +, = A ₄ <3A, = 4m

The arrangement according to the invention of the different Mahlplattenarten in the paraxial arrangement of the conical Klassiermahlplatten with lifting strips 1 is shown in Figure 2.

To achieve a maximum gradient of the lifting effect of the armor and thus the cataract effect of the grinding media from the Mahlbahnanfang to the Mahlbahnende the rolling armor with the profile geometry according to DD 281 298, i.e., triangular shape with radii on the profile hill and ground is used in section Ai.

According to FIG. 2, the following distribution of the different grinding plate types in the grinding track sections A ₁ results :

Λ · length grinding plates conical classifying plates without Pcs. Rollmahl rings With 1 lifting strips 3 0 plates Pcs. 176 5 m Pcs. 352 264 Pcs. A, 2.0 8th 176 0 0 A, 2.0 8th 88 440 0 A ₃ 2.0 8th 0 0 A ₄ 4.0 16 616 704 10.0 40 704

The proportion of the lifting effect of the armor goes with the number of conical Klassiermahlplatten with bars of 1760Stck.

on 1616 pieces, i.e. to - 100 = 35%, thereby foregoing 65% of the previously given cataract effect. The

possible power demand reduction of the fine grinding chamber is up to

Pm.K2 = 240OkW * 0.25 * 0.65 = 39OkW

Despite significantly reduced power consumption of the pulverizing chamber, the classification effect is significantly improved according to the invention by the superimposition of the maximum possible gradient of the lifting effect of the armor or of the cataract effect of the grinding bodies. This results in maintaining the Mahlkörperfüllungsgrades an increase in throughput of the grinding plant up to 10%. By maintaining the throughput to improve the mill's discharge fineness to ensure the quality of the cement grade produced, the grinding stone filling level of the pulverising room can be reduced to 20%, which also results in a reduction of the specific electrical energy requirement of up to 10%.

With a usual time utilization of the grinding plant in the calendar year of approximately 6000 operating hours / a, the following electrical energy savings are possible:

from power demand reduction: from throughput increase:

up to2340000kWh / a up to2000000kWh / a

In addition, the grinding ball wear in the pulverizing chamber is reduced by approx. 30% and the application mass of the armor for the pulverising chamber by approx. 10% due to greatly reduced impact stress of the grinding balls, which means a saving of approx. 7 tonnes of high-chromium alloyed cast steel.

Claims (5)

1. Inner lining * for tubular ball mills, consisting of conical classifying plates with (1) or axis parallel (2) lifting strips inclined to the longitudinal axis of the mill, conical classifying plates with a flat surface (3 or 4), otherwise the same taper and grinding plate length over which the taper is guided and rolling plates (5 or 6), the grinding surface is provided with radially extending profiles, characterized in that in the radial mill plane, d. H. in Mahlplattenring, conical Klassiermahlplatten with levers (1 or 2) in alternation with conical Klassiermahlplatten with a flat surface (3 or 4) are used so that in different, equally long Mahlbahnabschnitten A, with i <along the grinding path to R _n = a · 2 ⁿ - ^] mita = 4 ^ and 5 <η <1
"Ο! calculated "R _n " series Conical Klassiermahlplatten with lifting strips (1 or 2), which are arranged helically or axially parallel in the mill cylinder, with Ai: n = 5 or 4 or 3 each 2
A ₂ : n = 4oc ^ or 2 or 1
A ₃ : n = 3 or 2 or 1
A ,,: n = 2 or 1
A _B : n = 1 along the grinding path decrease successively, as long integers for R _n , which allow a symmetrical distribution in Mahlplattenring result, and that at the Mahlbahnende in section A _L + v whose Mahlbahnlänge A _L +1 <3 A ₁ , the arrangement of Rollmahlplatten ( 5 or 6). 2. Interior lining according to claim 1, characterized in that the conical Klassiermahlplatten with lifting strips (1 or 2) by Stufenmahlplatten (7) or non-conical grinding plates are replaced with at least one lifting bar. 3. Interior lining according to claim 1, characterized in that the conical Klassiermahlplatten with a flat surface (3 or 4) by Rollmahlplatten (5 or 6) or non-conical, smooth refining plates are replaced. 4. Interior lining according to claim 1, characterized in that in the extreme case at the Mahlbahnanfang in section Ai the continuous use of Stufenmahlplatten (7) in the Mahlbahnabschnitt A2 the continuous use of conical Klassiermahiplatten with lifting strips (1 or 2) and the Mahlbahnonde in Mahlbahnabschnitt A ₃ of Continuous use of roll milling plates (5 or 6) with grinding path lengths of A ₂ <3Ai and A ₃ <4Ai. 5. inner lining according to claim 1, characterized in that in the extreme case, the RollmahlDlatten (5 or 6) in Mahlbahnabschnitt A, +1 are replaced at the Mahlbahnende by conical Klassiermahlplatten with a flat surface (3 or 4). For this 2 pages drawings Field of application of the invention The invention relates to an inner lining for tubular ball mills, which is suitable for the comminution of mineral, synthetic and secondary raw materials or intermediate and end products. Characteristic of the known state of the art From the literature Klassiermahlplatten with different Mahlflächengestaltung are known for long reinmahlräume of tubular mills. The phenomenon known as the phenomenon of media classification of polydisperse media fillings, i. H. the stable arrangement of the large grinding media diameter at the beginning of the Mahlbahnanfang and the steady decrease in the diameter or the masses of the grinding media with the Mahlbahnlänge without internals, is significant because