DD220510A1 - Method and apparatus for fine reducing solid, mineral raw materials - Google Patents

Method and apparatus for fine reducing solid, mineral raw materials Download PDF

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Publication number
DD220510A1
DD220510A1 DD25928984A DD25928984A DD220510A1 DD 220510 A1 DD220510 A1 DD 220510A1 DD 25928984 A DD25928984 A DD 25928984A DD 25928984 A DD25928984 A DD 25928984A DD 220510 A1 DD220510 A1 DD 220510A1
Authority
DD
German Democratic Republic
Prior art keywords
item
plant
roll mill
raw materials
classifier
Prior art date
Application number
DD25928984A
Other languages
German (de)
Inventor
Fritz Feige
Original Assignee
Dessau Zementanlagenbau Veb
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dessau Zementanlagenbau Veb filed Critical Dessau Zementanlagenbau Veb
Priority to DD25928984A priority Critical patent/DD220510A1/en
Publication of DD220510A1 publication Critical patent/DD220510A1/en

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Abstract

The invention relates to a method and a plant for the fine comminution of solid, mineral raw materials in a roll mill with the aim to make the fine comminution effectively. The task consists in the development of a process and a plant with which the fine comminution with low specific energy requirement, low mechanical expenditure and favorable automation conditions is made possible. According to the invention, the object is achieved by the destruction of the agglomerates formed in the first comminution stage, together with the pre-comminution of the material to be dispensed to the first comminuting stage. Both material streams are then subjected to a common sighting. The system for carrying out the method is designed so that the classifier 2 is arranged above the roll mill 1 and its semicircular cone 5 serves as a filling level-controlled feed bunker and is designed as a nip splitter. Fig. 1

Description

For this 2 pages drawings

'Field of the invention

The invention relates to a method and a system for carrying out the method for fine comminution of solid, mineral raw materials with simultaneous drying of the raw materials, which finds particular application for the preparation of cement raw material, cement clinker and solid fuels.

'Characteristic of the known technical solutions

The fine comminution of mineral raw materials takes place with favorable energy utilization as granule bed in the nip a roll mill. As a general difficulty in this case, depending on the stress intensity and material proves the formation of agglomerates, which must be destroyed following the crushing process. Known methods provide that the pre-crushed to a certain particle size feed material is crushed and agglomerated in a first stage and in a second stage, the agglomerates are destroyed by a further mechanical stress, for example by a high-speed crusher.

DE-AS 27 08 053 states for this purpose that the stress in the nip is most effective at a pressure between the rolls of over 50MPa. The use of grinding aids also has a favorable effect in this pressure range. Also PS 81035 and 120803 assume that the roll mill is operated with very high rolling pressures or firmly set rolls and resulting agglomerates are destroyed in a second crushing stage by utilizing shear effects.

For fine comminution in the nip, it is necessary to limit the maximum grain size of the feed material, so that both the material intake and the circulation rate are favorably influenced. Furthermore, the nip requires a special feeding device. These additional measures mean that the grinding plant can be complicated by three levels of comminution and complicated in the driving and maintenance.

Explanation of the essence of the invention

The invention has for its object to provide a method and a system that allows the fine comminution of solid, mineral raw materials with low specific energy requirements, low mechanical complexity and favorable automation conditions.

According to the invention, the object is achieved by the destruction of the agglomerates formed in the first comminution stage, together with the pre-comminution of the material to be dispensed to the first comminuting stage. Following this, both material streams are subjected to a sighting. While the fines are removed, the coarse material of the first crushing stage is fed back, whereby the roll mill deducts the coarse material automatically from the semolina cone of the classifier. With moist material, the pre-crushing of the feed material, the destruction of the agglomerates and the sighting can be carried out with simultaneous drying.

The system for carrying out the method according to the invention is designed so that the classifier is arranged above the roller mill. In this case, the sifter is acted upon both the Umlaufgut and with the feed material. The coarse material collects in the semolina cone of the classifier, which serves as a level-controlled feed bunker and is designed as a wheat splitter distributor.

From the roller mill, the material passes into a pre-shredding device, which is preferably a schneemaufender crusher: In this, the agglomerates are destroyed together with the feed material. The crusher thus fulfills two functions, once the pre-shredding of the feedstock to a maximum feed grain size and secondly the destruction of the ( agglomerates.) Both streams of material are fed together by the crusher to the classifier, in which the fine material is separated from the coarse material.

A variant of the invention provides to arrange the crusher immediately under the roll mill. As a result, transport routes between the two units can be avoided. The feed material is in this case preferably pre-shredded outside the grinding plant and fed directly to the material circulation.

The drive of the rollers can be done differently. For example, both rollers may be driven separately or via a mechanical or electrical differential or such that one roller is towed by the other roller. In the latter case, the towed roller has only a drive for the purpose of accelerating the roller to working speed at the start of the mill.

The invention will be explained in more detail using an exemplary embodiment. The accompanying drawings show schematically in FIG. 1 a grinding system according to the invention,

2 shows a grinding plant with supply of hot gases,

3 shows a grinding plant according to FIG. 1 with feed pre-comminuted feed material outside the grinding plant into the material circuit to the separator, FIG.

4 shows a grinding plant with combined roller mill and deagglomerator.

In the drawings, the streams of material are shown by solid lines and the gas streams by broken lines.

The grinding plant consists in Fig. 1 from the roll mill 1, the classifier 2 with cyclone 3 and the high-speed crusher 4. Roll mill 1 and classifier 2 are arranged one above the other so that the semolina cone 5 of the classifier serves as a task bunker for the roll mill 1 and the outlet 6 of semolina cone 5 fulfills the function as a nip divider. The outlet of the semolina cone is lockable.

The feed material 7 is metered added to the crusher 4 and pre-shredded by this to a task grain size, which is adapted to optimum stress in the roll mill 1. The pre-shredded feedstock is transported via preferably mechanical height conveyor 8 to the classifier 1, where already contained fines are being sifted. The coarse material. collects in the semolina cone 5 and is withdrawn via the outlet 6 of the roller mill 1. Between the two rolls 9, 10 of the roll mill 1, the feedstock is crushed under high pressure and agglomerated. The agglomerates 11 are transported to the crusher 4 and this is abandoned together with the feed 7. With simultaneous pre-crushing of the feed material, the agglomerates are destroyed. Both materials arrive together via the height conveyor 8 to the sifter 2, which is preferably equipped without mechanical fittings. The fine material is discharged with the classifying air and separated from the classifying air in the cyclone separator 3. The classifying air is circulated by a fan 12. The coarse material collects in the semolina cone 5. The fill level in the semolina cone 5 can be regulated via the metering device of the feed material. The outlet 6 has a closure member to stop the flow of material to the roll mill at standstill and startup can.

The drying of moist feed material is very well possible in the system by the crusher 4 and the separator 2 are supplied with hot gases 13. This is done according to Fig. 2 such that fresh hot gases 13 are introduced into the crusher 4, during the crushing process in intensive heat exchange and the fines from the crusher 4 in continuation. transport the drying to the classifier 2, where these hot gases are used simultaneously with as a classifying air. The coarse material from the crusher 4 passes through the height conveyor 8 to the sifter. 2

In Figure 3 it is shown that with sufficient small-grain feed material 7 this is abandoned together with the destroyed agglomerates from the crusher 4 the sifter. The task takes place in the area of the elevator 8, but can also be done directly in the viewing space of the classifier.

A variant is shown in Fig.4. Here, the crusher 4 is formed doppelrotorig and combined with the roller mill 1 to form a structural unit. As a result, the cost of the system is reduced, in particular by the elimination of transport routes. The arrangement of a single-rotor crusher immediately under the roll mill is possible.

The advantages of the invention are that the mass-to-power ratio and also the specific energy consumption for the entire comminution process are reduced by combining Vorzerkl'einerung of the feedstock and destruction of the resulting in the roll mill agglomerates in a machine. The automatic feeding of the roller mill leads to a maximum loading of the nip and to optimum load conditions.

Claims (11)

  1. -2- 259 289
    Invention claims:
    A process for comminuting and grinding solid, mineral raw materials, preferably cement raw materials, cement clinker and solid fuel, in which the comminution of the already pre-shredded material is carried out using high pressures and deagglomeration in two stages, characterized in that the destruction of the in the first Crushing stage entstahdenen agglomerates takes place together with the pre-crushing of the material to be fed to the first crushing stage and then the screening is carried out, the>
      Coarse fractions are fed back to the first crushing stage.
  2. 2. The method according to item 1 and 2, characterized in that the pre-shredded material is fed together with the circulating material on the classifier or its semolina cone of the first crushing stage.
  3. 3. The method according to item 1, characterized in that the pre-crushing and sifting of the material takes place with simultaneous drying. \
  4. 4. The method according to item 1 and 3, characterized in that the roll mill deducts the material from the semolina cone automatically according to their peripheral speed and the set nip.
  5. 5. Plant for finely comminuting and grinding dry solid, mineral raw materials, preferably cement raw materials, cement clinker and solid fuels, in which a roll mill a preferably schneilaufender crusher is connected after point T, characterized in that the separator (2) directly on the roll mill (1) set up and the semolina cone (5) of the classifier (2) is at the same time designed as a filling-rate-controlled feed bunker and a nip distributor for the roll mill (1),
  6. 6. Plant according to item 5, characterized in that the high-speed crusher (4) one or two-rotor design and immediately below the roller mill (1) is arranged.
  7. 7. Installation according to item 5, characterized in that as a classifier (2) preferably a recirculating air fan with external fan without rotating internals is used.
  8. 8. Facilities according to item 5 and 7, characterized in that the level control as a task bunker and Waizenpaltzuteiler trained Sichtergrießkonus (5) is closable.
  9. 9. Plant according to item 5 and 6, characterized in that the roll shell of the roll mill (1) can be removed during operation by a device mounted on the mill.
  10. 10. Plant according to item 5.6 and 9, characterized in that when using a towing drive, the fixed roller (9) designed as a drag roller and the second, only with low elasticity or firmly employed roller (10) is equipped with a starter drive.
  11. 11. Plant according to item 5, characterized in that the throughput of the system on the peripheral speed of . Rollers can be adjusted continuously.
DD25928984A 1984-01-09 1984-01-09 Method and apparatus for fine reducing solid, mineral raw materials DD220510A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DD25928984A DD220510A1 (en) 1984-01-09 1984-01-09 Method and apparatus for fine reducing solid, mineral raw materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD25928984A DD220510A1 (en) 1984-01-09 1984-01-09 Method and apparatus for fine reducing solid, mineral raw materials

Publications (1)

Publication Number Publication Date
DD220510A1 true DD220510A1 (en) 1985-04-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
DD25928984A DD220510A1 (en) 1984-01-09 1984-01-09 Method and apparatus for fine reducing solid, mineral raw materials

Country Status (1)

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DD (1) DD220510A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544798A1 (en) * 1985-10-29 1987-04-30 Kloeckner Humboldt Deutz Ag DEVICE FOR CRUSHING AND GRINDING SPROEDEN GROUND MATERIALS, IN PARTICULAR OF DAMP STARTING MATERIAL
EP0273198A2 (en) * 1986-12-23 1988-07-06 Krupp Polysius Ag Method and installation for the two-stage crushing of brittle material
DE4023624A1 (en) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Tubular ball mill for cement processing - use lined process spaces and specified charge ball size using spheroidal graphite iron linings of triangular profile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544798A1 (en) * 1985-10-29 1987-04-30 Kloeckner Humboldt Deutz Ag DEVICE FOR CRUSHING AND GRINDING SPROEDEN GROUND MATERIALS, IN PARTICULAR OF DAMP STARTING MATERIAL
EP0273198A2 (en) * 1986-12-23 1988-07-06 Krupp Polysius Ag Method and installation for the two-stage crushing of brittle material
EP0273198A3 (en) * 1986-12-23 1989-08-16 Krupp Polysius Ag Method and installation for the two-stage crushing of brittle material
DE4023624A1 (en) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Tubular ball mill for cement processing - use lined process spaces and specified charge ball size using spheroidal graphite iron linings of triangular profile

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