DE102018205166A1 - Milling plants with separate tube mills and screening drums - Google Patents

Abstract

Milling plant comprising at least one tube mill and at least one screen drum, characterized in that the tube mill and the screen drum separate assemblies and are decoupled from each other and use of such facilities.

Description

The present invention relates to grinding plants with separate tube mills and screening drums and the use of such facilities.

Tube mills in wet grinding are often equipped with sieve drums. This sieve drum is firmly connected to the tube mill and thus rotates with the mill speed. The sieve drum is used for screening of the ground material and also as pump protection for subsequent units. This arrangement is a standard solution, both for circumferentially mounted tube mills, as well as for neck mounted tube mills.

Naturally, such arrangements are relatively inflexible with regard to, inter alia, the rotational speeds, the spatial arrangement, the repair, the operation, maintenance work such as the replacement of screen coverings, etc., so that there was room for improvement here.

An exemplary document of the prior art is the GB 384 736 A , In this document, the mill and sieve are connected together by an "active" conduit so that the mill and sieve are coupled together, ie conveying the material from the mill to the sieve requires additional energy input (for aggregates such as pumps or screws).

The object of the present invention was thus to find a solution with which the problems of the prior art can be avoided or eliminated.

These and other objects, which will be apparent to those skilled in the art upon consideration of the present specification, are achieved by the subject matters of the claims, the subclaims being preferred embodiments.

Further preferred and advantageous embodiments will become apparent from the following description.

The present invention is based on the fact that the tube mill and the screen drum are decoupled in a grinding plant, preferably for wet grinding, separate assemblies and from each other. In particular, tube mill and screen drum are still in close proximity, which means that tube mill and screen drum have the same distance, as in conventional grinding plants, in which the tube mill and drum are connected directly to each other. In other words, they are spatially close together. Typically, and in preferred embodiments, the distance between mill outlet and drum inlet is between 10 cm and 1 m.

Decoupled from each other in the context of the present invention means that the units are arranged on the same plant ground or plant area, the movement of a unit that of the others but not readily influenced. This means that, for example, the tube mill can perform a rotary movement without directly moving the sieve drum. The milled product is therefore not stored temporarily and transported out of the plant to be screened in another, spatially separated plant. The ground material can therefore, in particular in preferred embodiments, be fed directly from the mill discharge to the decoupled sieve drum.

Nevertheless, it is still possible to dynamically connect the tube mill and the screen drum with each other, so that the rotary motion of the tube mill can induce a rotational movement of the screen drum; This is possible, for example, by interposable driving devices.

In the prior art tube mill and drum were always coupled or connected.

In the context of the present invention it has been found that although separation of tube mill and screen drum has not hitherto been considered in the prior art, such separation nevertheless leads to advantageous effects.

According to the present invention, the separation of the fixed connection of the tube mill and the screen drum makes it possible to respond more flexibly to process requirements and constructional requirements without, however, abandoning the advantages of the spatial proximity to the mill. The present invention achieves great flexibility in plant design. It is also possible in addition to switch aggregates between the mill and drum.

In the context of the present invention, a wide variety of conventional mills can be used. These are preferably selected from the group consisting of autogenous mills (AG mills), semi-autogenous mills (SAG mills), full autogenous mill (F + AG), ball mills, drum mills, rod mills, scrubbers and crushers, conical or step mills, drum dryers.

In the context of the present invention, mills of various designs can be used with regard to mill storage. These are preferably selected from the group consisting of circumferentially mounted mills, Caged mills, roller mills and sliding mills.

The grinding chamber of the mill used can be lined. The grinding chamber can also be separated by intermediate walls into several areas.

The discharge of the mills used according to the invention can be varied depending on the millbase used.

In the context of the present invention, the mills can be used both for wet milling and for dry milling. In a variant of the present invention, the mills are those for wet milling.

It is also possible in the context of the present invention to combine different mills with one another and to connect, for example, in series. In different variants SAG-mill and ball mill are combined.

In the context of the present invention, various screening machines can be used, in particular screening drums.

The screening drums are selected in their specifications according to the intended application. That the size of the sieves, the perforations, the webs is selectable, whether the holes are offset or straight, if any filaments are attached, and which materials and material thicknesses are used.

The drum can be driven, in particular rotate, or remain static. In the case of driven drums conventional drives such as gears, timing belts, friction wheel or the like can be used.

Conical, stepped and multi-walled (usually double-walled) screening drums can also be used in the context of the present invention.

In the context of the present invention, the screen drum can be driven in various ways.

1. a) durch die Rohrmühle mittels einer Mitnahmevorrichtung,
2. b) durch einen eigenen Antrieb, oder
3. c) durch kinetische Energie des Materialflusses.

In preferred embodiments, the drive of the screen drum takes place

1. a) through the tube mill by means of a driving device,
2. b) by its own drive, or
3. c) by kinetic energy of the material flow.

It is possible in the context of the present invention to control both the direction of rotation and the rotational speed of the screen drum independently of the tube mill.

In the context of the present invention, the screening drums can be equipped with a swing mechanism, for example via a suspension or via a swing frame or the like.

In the context of the present invention, the screening drum can be arranged and / or aligned in various ways. The arrangement or orientation is independent of the design of the sieve drum.

The axis of rotation of the screening drum is arranged horizontally or inclined at a certain or indefinite angle.

In preferred embodiments, the screen drum is horizontally inclined. This horizontal inclined means an angle of the drum main axis (opening of the drum is above) from 45 ° to 90 ° relative to the vertical.

In preferred embodiments, the inclination of the screen drum can be varied, in particular automatically controlled and / or regulated.

In a variant of the present invention, several movable screening drums are used per tube mill. As a result, various advantages are realized, for example, a better accessibility of the mill is achieved, and an easier, faster and easier replacement is possible if, for example, another screening is desired or defects occur.

In the context of the present invention, in contrast to the prior art, owing to the separation of the mill and the sieve, various further or additional units can be arranged between the mill and the sieve. It is possible to arrange one or more units.

Examples of usable in the context of the present invention are magnetic separators, aggregates for sampling, aggregates for measuring temperature and aggregates for measuring other properties, aggregates for vaccination, aggregates for adding additives to mill, aggregates for adding bypass regrind from previous grinding stages or parallel mills.

A preferred aggregate which can be used in the context of the present invention is a magnetic separator, in particular for the sorting out of metal scrap.

By means of this magnetic separator, in a preferred embodiment, ball scrap is sorted out laterally or horizontally, relative to the material flow vector of the ground material. Likewise, sorting out in the direction of or against the material flow, vertical (top or bottom) or in several directions simultaneously possible.

For the transfer of the material to be ground into the sieve drum, various commercially available devices (transfer devices) can be used in the context of the present invention.

In various embodiments, these may be selected from the group consisting of chutes, chutes, spouts, downcomers, hoppers, gutters, baffles, baffles, and combinations thereof.

Chutes which can be used in the context of the present invention can be made of a plurality of joined metal sheets. In order to prevent or slow down mechanical wear caused by the material, it is also possible to use design-enforced brakes (material upholstery, autogenous wear protection), wear-resistant metal sheets or plastic linings.

Examples of usable chutes are trousers chutes, hinged chutes or Leitgossen.

It is within the scope of the present invention possible to integrate the transfer devices in the above-mentioned aggregates or to grow on these.

In the context of the present invention, however, a transfer device is not necessary, it is also possible directly from the mill and possibly by the additional units / on the additional units passing material coming directly to the screen drum to give.

A particular embodiment of the present invention is a wet grinding plant comprising a tube mill and a screen drum, in which the tube mill and the screen drum are separate assemblies that are decoupled from each other and between the tube mill and screen drum an additional aggregate and a transfer device for the ground material to the screen drum are arranged.

• Ausführungsform I. Vermahlungsanlage umfassend mindestens eine Rohrmühle und mindestens eine Siebtrommel, dadurch gekennzeichnet, dass die Rohrmühle und die Siebtrommel separate Baugruppen und voneinander entkoppelt sind.
• Ausführungsform II. Vermahlungsanlage nach Ausführungsform I, dadurch gekennzeichnet, dass es eine Anlage zur Nassvermahlung oder zur Trockenvermahlung, besonders bevorzugt eine Anlage zur Nassvermahlung, ist.
• Ausführungsform III. Vermahlungsanlage nach Ausführungsform I oder II, dadurch gekennzeichnet, dass zwischen der Rohrmühle und der Siebtrommel eine Übergabevorrichtung für die Materialübergabe angeordnet ist.
• Ausführungsform IV. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass zwischen der Rohrmühle und der Siebtrommel mindestens ein zusätzliches Aggregat, bevorzugt ein Magnetabscheider, angeordnet ist.
• Ausführungsform V. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Siebtrommel
  1. a) durch die Rohrmühle mittels einer Mitnahmevorrichtung,
  2. b) durch einen eigenen Antrieb, oder
  3. c) durch kinetische Energie des Materialflusses. angetrieben wird.
• Ausführungsform VI. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Siebtrommel
  1. a) nicht-drehend ausgeführt ist, oder
  2. b) drehend ausgeführt ist, wobei die Drehrichtung der Siebtrommel der Drehrichtung der Rohrmühle entspricht oder ihr entgegengesetzt ist.
• Ausführungsform Via. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Drehgeschwindigkeit der Siebtrommel von derjenigen der Rohrmühle abweicht oder mit der Drehgeschwindigkeit der Rohrmühle übereinstimmt oder dass die Drehgeschwindigkeit variabel ausgeführt wird.
• Ausführungsform VII. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass eine Siebtrommel Material von mehr als einer Rohrmühle empfängt.
• Ausführungsform VIII. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Siebtrommel einen Schwingmechanismus aufweist.
• Ausführungsform IX. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Siebtrommel geneigt ausgestaltet ist, wobei die Neigung der Siebtrommel bevorzugt mittels Automatik gesteuert wird.
• Ausführungsform X. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die mindestens eine Siebtrommel verfahrbar ausgeführt ist.
• Ausführungsform XI. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass jeder Rohrmühle mehrere Siebtrommeln zugeordnet sind, wobei die Siebtrommeln einer Rohrmühle parallel oder nacheinander beschickt werden.
• Ausführungsform XII. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass die Anordnung der Siebtrommel unabhängig von der Bauart der Siebtrommel ist.
• Ausführungsform XIII. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen, dadurch gekennzeichnet, dass
  • i) stromabwärts, bezogen auf den Materialfluss des Mahlguts, nach der Rohrmühle ein Magnetabscheider angeordnet ist,
  • ii) zwischen dem Magnetabscheider und der Siebtrommel eine Übergabevorrichtung für die Materialübergabe angeordnet ist, und
  dass die Vermahlungsanlage eine Anlage zur Nassvermahlung ist.
• Ausführungsform XIII. Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen für die Verarbeitung von Erzen, insbesondere Kupfer und/oder Gold enthaltenden Erzen.
• Ausführungsform XIII. Verwendung einer Vermahlungsanlage nach einer der vorhergehenden Ausführungsformen für die Vermahlung von Erzen, insbesondere für die Vermahlung von Kupfer und/oder Gold enthaltenden Erzen.

Particular embodiments of the present invention are the following embodiments designated by Roman numerals:

• Embodiment I. Milling plant comprising at least one tube mill and at least one screen drum, characterized in that the tube mill and the screen drum separate assemblies and are decoupled from each other.
• Embodiment II. Milling plant according to embodiment I, characterized in that it is a plant for wet milling or dry milling, more preferably a plant for wet milling.
• Embodiment III. Milling plant according to embodiment I or II, characterized in that a transfer device for the material transfer is arranged between the tube mill and the screen drum.
• Embodiment IV. Milling plant according to one of the preceding embodiments, characterized in that at least one additional aggregate, preferably a magnetic separator, is arranged between the tube mill and the sieve drum.
• Embodiment V. Milling plant according to one of the preceding embodiments, characterized in that the sieve drum
  1. a) through the tube mill by means of a driving device,
  2. b) by its own drive, or
  3. c) by kinetic energy of the material flow. is driven.
• Embodiment VI. Milling plant according to one of the preceding embodiments, characterized in that the sieve drum
  1. a) is non-rotating, or
  2. b) is designed to rotate, wherein the direction of rotation of the drum corresponds to the direction of rotation of the tube mill or is opposite.
• Embodiment Via. Milling plant according to one of the preceding embodiments, characterized in that the rotational speed of the screening drum deviates from that of the tube mill or coincides with the rotational speed of the tube mill or that the rotational speed is carried out variably.
• Embodiment VII. Milling plant according to one of the preceding embodiments, characterized in that a screening drum receives material from more than one tube mill.
• Embodiment VIII. Milling plant according to one of the preceding embodiments, characterized in that the sieve drum has a vibrating mechanism.
• Embodiment IX. Milling plant according to one of the preceding embodiments, characterized in that the screen drum is designed inclined, wherein the inclination of the screen drum is preferably controlled by means of automatic.
• Embodiment X. Milling plant according to one of the preceding embodiments, characterized in that the at least one screening drum is designed to be movable.
• Embodiment XI. Milling plant according to one of the preceding embodiments, characterized in that each tube mill are assigned a plurality of sieve drums, wherein the sieve drums of a tube mill are fed in parallel or in succession.
• Embodiment XII. Milling plant according to one of the preceding embodiments, characterized in that the arrangement of the sieve drum is independent of the type of sieve drum.
• Embodiment XIII. Milling plant according to one of the preceding embodiments, characterized in that
  • i) downstream, based on the material flow of the ground material, a magnetic separator is arranged after the tube mill,
  • ii) between the magnetic separator and the screen drum, a transfer device for the transfer of material is arranged, and
  that the grinding plant is a plant for wet grinding.
• Embodiment XIII. Milling plant according to one of the preceding embodiments for the processing of ores, in particular copper and / or gold-containing ores.
• Embodiment XIII. Use of a grinding plant according to one of the preceding embodiments for the grinding of ores, in particular for the grinding of copper and / or gold-containing ores.

An advantage of the present invention is that it is possible to grind millbase on several mills and place the millbase of the various mills on a sieve drum. In this case, the millbase originating from the various mills can either be entered sequentially on the screen drum or simultaneously (in parallel or in succession).

Similarly, it is possible to assign a mill several sieve drums, which are fed successively or in parallel (the latter using a Mahlgutteilers). With this arrangement, a sieve drum can be made "standby", i. while one is being used, another is being held. This can increase the flexibility and availability of the system; It is thus possible, for example, to use several different sieve drums in succession, if a different sieve quality is desired during grinding, or if a sieve drum should have a defect or has to be taken out of the process for maintenance work.

• - eine einfachere Konstruktion und Fertigung der Mühlen- und Siebstruktur durch Entlastung ist möglich,
• - man ist freier in der Anlagengestaltung,
• - eine größere Prozessvariabilität ist gegeben,
• - die Antriebsleistung der Rohrmühle kann niedriger gehalten werden,
• - die Siebung ist besser an prozesstechnische Parameter anpassbar,
• - eine effizientere Siebung ist möglich,
• - ein geringerer Verschleiß der Siebbeläge durch andere, optimale, z.B. niedrigere, Umfangsgeschwindigkeit wird erreicht,
• - ein Herabfallen der Trommel im Schadensfall wird unterbunden
• - eine passive Überleitung des Materials von Rohrmühle zur Siebtrommel wird ermöglicht, wodurch kein zusätzlicher externer Energieeintrag erforderlich wird.

Among other things, the objects of the present invention provide the following advantages:

• - a simpler design and manufacture of the mill and screen structure by relieving is possible
• - one is freer in plant design,
• - greater process variability is given
• the drive power of the tube mill can be kept lower,
• - Screening is better adaptable to process parameters,
• - a more efficient screening is possible
• a lesser wear of the screen coverings by other, optimal, eg lower, peripheral speed is achieved
• - Falling of the drum in case of damage is prevented
• - A passive transfer of the material from tube mill to the drum is made possible, whereby no additional external energy input is required.

The various embodiments, embodiments and variants of the present invention, for example, but not limited to, the various claims, can be combined with each other, as long as such combinations are not contradictory.

The present invention will be explained in more detail below with reference to the drawings. The drawings are not to be interpreted as limiting and not to scale. Furthermore, the drawings do not contain all the features that conventional installations have, but are reduced to the features essential to the present invention and their understanding.

list of figures

• 1 shows a tube mill with firmly connected screening drum according to the prior art.
• 2 shows a tube mill with decoupled screening drum and additional units according to the present invention. Illustrated here is a tube mill 1 and one of them structurally separate screen drum 2 , In the 2 is an additional unit 3 illustrates which in preferred embodiments a magnetic separator can be sorted out laterally by the ball scrap. In addition, a transfer device 4 shown for coming out of the mill and by the additional unit / on the additional unit passing material, the transfer device may be, for example, a sheet.

LIST OF REFERENCE NUMBERS

1

tube mill

2

screen drum

3

additional aggregate (s)

4

Transfer device for material

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• GB 384736 A [0004]

Claims (15)

Milling plant comprising at least one tube mill and at least one screen drum, characterized in that the tube mill and the screen drum separate assemblies and are decoupled from each other. Milling plant after Claim 1 , characterized in that it is a plant for wet grinding, for dry grinding, particularly preferably a plant for wet grinding. Milling plant after Claim 1 or 2 , characterized in that between the tube mill and the screen drum, a transfer device for the material transfer is arranged. Milling plant according to one of the preceding claims, characterized in that at least one additional aggregate, preferably a magnetic separator, is arranged between the tube mill and the sieve drum. Milling plant according to one of the preceding claims, characterized in that the screening drum a) by the tube mill by means of a driving device, b) by its own drive, or c) by kinetic energy of the material flow. is driven. Milling plant according to one of the preceding claims, characterized in that the screen drum a) is non-rotating, or b) is designed to rotate, wherein the direction of rotation of the screen drum of the direction of rotation of the tube mill corresponds to or opposite to it and the rotational speed of the screen drum of that of Tube mill deviates or coincides with the rotational speed of the tube mill. Milling plant according to one of the preceding claims, characterized in that a screening drum receives material from more than one tube mill. Milling plant according to one of the preceding claims, characterized in that the sieve drum has a vibrating mechanism. Milling plant according to one of the preceding claims, characterized in that the sieve drum is configured inclined, wherein the inclination of the sieve drum is preferably controlled by means of automatic. Grinding system according to any one of the preceding claims, characterized in that the at least one screen drum is made movable. Milling plant according to one of the preceding claims, characterized in that each tube mill are assigned a plurality of sieve drums, wherein the sieve drums of a tube mill are fed in parallel or in succession. Grinding system according to any one of the preceding claims, characterized in that the arrangement of the sieve drum is independent of the type of the screen drum. Milling plant according to one of the preceding claims, characterized in that i) downstream, based on the material flow of the material to be ground, after the tube mill, a magnetic separator is arranged, il) between the magnetic separator and the screen drum, a transfer device for the material transfer is arranged, and that the grinding plant is a plant for wet grinding. Milling plant according to one of the preceding claims for the processing of ores, in particular copper and / or gold-containing ores. Use of a grinding plant according to one of the preceding claims for the grinding of ores, in particular for the grinding of copper and / or gold-containing ores.

Images