WO2013189685A1

WO2013189685A1 - Device for separating magnetic and/or magnetizable particles from a suspension, and the use of said device

Info

Publication number: WO2013189685A1
Application number: PCT/EP2013/060562
Authority: WO
Inventors: Wolfgang Krieglstein; Ralph Oliver Schmidt
Original assignee: Siemens Aktiengesellschaft
Priority date: 2012-06-19
Filing date: 2013-05-23
Publication date: 2013-12-27
Also published as: EP2676733A1; CN104394994A; RU2014143267A

Abstract

The invention relates to a device (1,1´,1´´,1´´´) for separating magnetic and/or magnetizable particles from a suspension (9) which also contains nonmagnetic and/or non-magnetizable particles. The device comprises - at least one magnetic separator (3, 3´) and - at least one flotation cell (2, 2´). The at least one magnetic separator (3, 3´) and the at least one flotation cell (2, 2´) are vertically stacked one above the other and are connected to each other via a pipeline system such that at least one flow (10, 10´) of valuable substances comprising at least some of the magnetic and/or magnetizable particles can flow through the at least one magnetic separator (3, 3´) as well as through the at least one flotation cell (2, 2´).

Description

description

Device for separating magnetic and / or magnetizable particles from a suspension and their use

The invention relates to a device for separating magnetic and / or magnetizable particles from a suspension comprising non-magnetic and / or non-magnetizable particles, further comprising

- At least one magnetic separator and

- At least one flotation cell.

The invention further relates to a use of such a device.

In mining, the separation of valuable materials from minerals a variety of separation processes are used. This is one of the main separation process magnetic Sepa ^¬ ration, in which the magnetic properties of constituents of the mineral partly be used as a separation criterion. But a flotation is often used for the separation of recyclables of minerals, wherein the material to be separated is hydrophobic or is specifically hydrophobized. In particular, in the treatment of iron ores, both separation methods are used successively.

Magnetic separators are already known and are ^{insbesonde ¬} re used in the mining industry and the metal industry, but also in other industries. That's how it describes

RU 2365421 Cl a magnetic separator with a drum and a magnet assembly, which is formed around the drum axis of the drum rotating and includes permanent magnets, for a wet separation. Today's designs of magnetic separators with drums, also called drum separators, in particular low-field magnetic separators for the wet treatment of particularly strong magnetic iron ores, usually work on the principle of Aushebescheidung. Other types of magnetic separators that use circulating magnetized tapes or traveling magnetic fields are also known. Flotation is a physical separation process for separating fine-grained mixtures of solids, such as ores and gangue, in an aqueous slurry by means of air bubbles due to a different surface wettability of the particles contained in the suspension. It is used for the treatment of mineral resources and in the processing of preferably mineral ^¬ substances with a low to medium content of a useful component or a valuable material, in ^¬ example in the form of non-ferrous metals, iron, metals of rare earths and / or precious metals and non-metallic mineral resources. In general, an application of the flotation but also in other technical fields, such as wastewater treatment, already sufficiently known ^¬ be.

WO 2006/069995 A1 describes a flotation device in the form of a pneumatic flotation cell with a housing comprising a flotation chamber, with at least one nozzle arrangement, here referred to as ejectors, furthermore with at least one gassing device, called aeration devices or aerators when using air, and a Collecting container for a foam product formed during flotation. In the pneumatic flotation an offset with Rea ^¬ genzien suspension is introduced from water and fine-grained solids via at least one nozzle array in a Flota ^¬ tion chamber in general. The reagents are intended to allow in particular the valuable, preferably separated particle kel or value particles in the suspension are hydrophobic out ^¬ forms. Most are set ^¬ as reagents xanthates, particularly hydrophobic and selectively to sulfidic ore particles. Simultaneously with the suspension, the At least one nozzle arrangement gas, in particular air, supplied ^¬ , which comes into contact with the hydrophobic particles in the suspension. The hydrophobic particles adhere to forming gas bubbles, so that the gas bubble structures, also called aeroflocs, float and form the foam product on the surface of the suspension. The foam product is discharged into a collecting container and usually thickened. The quality of the foam product and the separation efficiency of the driving Ver ^¬ flotation is dependent inter alia on the collision probability between a hydrophobic particles and a gas bubble. The higher the probability of collision, the greater the number of hydrophobic particles that adhere to a gas bubble, rise to the surface and together with the particles form the foam product.

Specific embodiments of the pneumatic flotation are, for example, the relaxation flotation or column flotation.

In columnar flotation cells in which a diameter of the flotation chamber is many times smaller than its height, the path which a gas bubble must travel in the suspension or the flotation chamber in order to reach the surface of the suspension is particularly large. Due to the particularly long way, particularly large gas bubbles are formed in the suspension. As a result, the specific discharge of valuable material particles from the suspension and thus also the efficiency of the flotation device decrease.

In so-called hybrid flotation cells, which represent a combination of a pneumatic flotation cell with a column-like flotation ^cell formed from ^fines , fines with particle diameters in the range of 20 ym and less are deposited particularly well. Likewise the Rührwerksflotation is based on the incorporation of gas bubbles in the flotation process, but will be ^¬ characterized not as a pneumatic flotation process generally. In the latter embodiment of the flotation, the production of desired gas bubbles, in particular desired size distributions of the gas bubbles, takes place by means of an agitator. Suitable for carrying out such a method ^¬ flotation devices are therefore also referred to as inter alia Rührwerkszellen.

The above flotation processes are generally carried out by means of corresponding flotation devices, in particular flotation cells. Usually, a flotation is carried out in such a way that the value ^¬ material is discharged upward with the foam. However, a flotation cell can also be operated in reverse, wherein the recyclable material containing magnetic and / or magnetizable particles at the lower outlet is discharged from the flotation cell and non-magnetic and / or non-magnetizable particles, the so-called waste materials, via the foam be discharged upward from the flotation chamber. This type of flotation, also called "reverse flotation", is used in particular in the treatment of iron ores.

The two mentioned separation processes, ie the magnetic separation and the flotation, each require their implementation a minimum volume or mass related machine or process throughput and a certain Anlagenaufsteil ^¬ area, the machine base and further mixing vessel for chemical conditioning of the suspension, eg for the addition hydrophobizing flotation chemicals. In addition, a base for the laying of pipelines and the installation of pumps is needed, which connect the different parts of the system of magnetic separation with those of the flotation. It is an object of the invention to provide a cost effective and easy to operate device for separating magnetic

and / or magnetizable particles from a suspension. It is another object of the invention to provide an advantageous use of such a device.

The invention is solved for the device for separating magnetic and / or magnetisable particles from a suspension containing non-magnetic and / or non-magnetizable particles by comprising:

- At least one magnetic separator and

at least one flotation cell,

wherein the at least one magnetic separator and the at least one flotation cell are vertically stacked angeord ^¬ net and connected to each other via a piping system, such that the at least one magnetic separator as well as the at least one flotation of at least one recyclable material comprising at least a portion of the magnetic see and / or magnetizable particles can be flowed through.

Due to the vertical stacking of magnetic separators and flotation cells to carry out the different

Separation process, the high space requirements, today's systems including such different separation units usually require drastically reduced. The required tube ^¬ pipe system for connecting the magnetic separator (s) and flotation cell (s) can be saved considerably simplified and shortened constructed and einge- pump for the transport of the suspension. This lowers the cost of operating the Vorrich ^¬ processing and significantly simplifies the monitoring by Be ^¬ operating personnel.

In particular, the vertical central axis of a magnetic separator and a flotation cell overlap. Also an over ^¬ lobing the required footprint of a magnetic separator and a required base area for a flotation cell of at least 50% has proven itself. It has proven particularly useful if the at least one flotation cell is arranged vertically above the at least one Mag ^¬ netseparators. In particular, a Flota ^¬ tion cell is arranged vertically above a magnetic separator. The flow conditions in flotation cells can be adjusted in such a way that agglomerates forming in the suspension of magnetic and / or magnetizable particles, ie recyclable particles, and furthermore nonmagnetic and / or nonmagnetizable particles, ie waste materials, are destroyed. This is done in particular by a turbulent flow guidance and / or a sufficiently high flow velocity in the flotation cell. The current coming from the flotation cell Wertstoffström can be due to the small amount of contained agglomerates particularly efficient in a downstream process downstream of ^¬ parent magnetic separator, wherein the value stream can flow without additional expenditure of energy in the direction of the magnetic separator without the aid of pumps and therefore.

If formation of agglomerates can not be sufficiently counteracted by the above-mentioned measures in the at least one flotation cell, it has proved useful to provide a guide between the at least one flotation cell and the at least one magnetic separator, which has a high shear force on the at least one flotation exerts ^¬ cell coming Wertstoffström and contained Agglome ^¬ rate destroyed and thus favors the separation of still contained in the Agglomera ^¬ th waste. It is preferably a guide device which generates a turbulent flow of the valuable material stream. Accordingly, as a guide, for example, a device can be used which generates strong swirling in the material flow, displaces it into a swirling motion or greatly accelerates it.

Preferably, at least one pad valve between the Flota ^¬ tion cell and the magnetic separator is arranged, through which the Wertstoffström from the flotation cell in the magnetic sepa- rator is convertible. The tampon valve allows a

Equalization of the recyclable material flow and its distribution in the feeding area of the magnetic separator. Alternatively, however, the at least one magnetic separator may be attached ^¬ arranged vertically above the at least one flotation cell. In particular, a magnetic separator is arranged vertically above a flotation cell. In this case too, the advantages of a minimum space requirement and significantly reduced costs for infrastructure and operation are achieved.

If a formation of agglomerates in Wertstoffström occurs, which is led from the magnetic separator in the direction of the flotation cell, it has also proven, Zvi ^¬ rule to provide the at least one magnetic separator and the at least one flotation cell, a guide device, which the high shearing force to from the at least one magnet ^¬ separator coming Wertstoffström exerts and destroys agglomerates contained and thus promotes the separation of in the Agglo ^¬ meraten still contained waste. It is also preferable here a guide, which generates a turbulent flow of the recyclable material stream. As Leitein ^¬ direction thus can serve as a device, for example, produces strong turbulence in Wertstoffström, this set into a swirling motion, or greatly accelerated.

Preferably, the at least one flotation cell comprises Minim ^¬ least an ejector for injecting the at least one substance of value stream to a flotation chamber of the flotation cell, which is connected in ^¬ magnetic separator via the pipe line system with the at least one ejector.

When the amount is not sufficient, at material to provide a downstream switched aggregate with the required Wertstoffström per unit time can be fed to a single magnetic separator if necessary, the value of ^¬ substance streams of several flotation cells, or the value of several streams Mag- Netseparatoren a single flotation cell are supplied.

The at least one magnetic separator is preferably formed by a drum separator described above. The at least one flotation cell is preferably formed by a hybrid flotation cell described above.

In particular, it is advantageous if the at least one magnetic separator and the at least one flotation cell are arranged vertically stacked in a common support and / or housing device. This facilitates the arrangement of the separation units to each other and the installation of the piping system in a small space.

The use of a device according to the invention for separating magnetic and / or magnetizable ore particles from a suspension, in particular iron ore suspension, which also contains non-magnetic and / or non-magnetizable particles, is ideal.

FIGS. 1 to 5 are intended to illustrate devices according to the invention by way of example and schematically. 1 shows a first device,

2 shows a detail of the first device,

3 shows a second device with two flotation cells,

4 shows a third device and

5 shows a fourth device with two magnetic separators.

1 shows schematically a first device 1 for separating magnetic and / or magnetizable particles from a suspension 9 further comprising non-magnetic and / or non-magnetizable particles, comprising a Magnetsepara- tor 3 and a flotation cell 2. 2 shows an off ^¬ 1 with a concrete representation of the flotation cell 2 and the magnetic separator 3. The magnetic separator 3 and the flotation cell 2 are in a common carrier and / or housing device 4 space-saving vertical überei ^¬ stacked arranged and interconnected via a piping system, such that the magnetic separator 3 as well as the flotation cell 2 of a Wertstoffström 10, 10 'comprising at least a portion of the magnetic and / or magnetizable particles can be flowed through. Here, the flotation cell 2 is above the magnetic separator 3 instal ^¬ lines. The piping system not shown in detail comprises generally and in the figures all areas in which the value ^¬ material flow 10, 10 'between the magnetic separator (s) and

Flotation cell (s) is transported or directed. The suspension 9 is injected via ejectors 2b (see FIG 2) in the flotation chamber 2a of the flotation cell 2 and in a Wertstoffström 10 containing magnetic and / or magnetizable particles, and a waste stream 11 contained ^¬ tend non-magnetic and / or non-magnetizable particle isolated. The waste stream flowing over a Schaumsammei ^¬ groove 2c from (what is meant by the term "reverse flotation" is known.) The Wertstoffström 10 of the flotation cell 10, which is in particular designed as Hybridflotationszelle, now flows via a tampon valve 6 downward into the magnetic Separator 3, where a further separation of the valuable material flow 10 into a still higher-quality recyclable material flow 10 'and a further waste flow 11' takes place.

Due to the arrangement of the flotation cell 2 and the magnet ^¬ separator 3 to each other, the space requirement of the device 1 on the foundation 5 is extremely low and the flow direction of the suspension 9 from top to bottom towards the foundation can be exploited, without pumps would have to be used , 3 shows schematically a second apparatus 1 'for separating magnetic and / or magnetizable particles from a suspension 9 further containing non-magnetic and / or non-magnetizable particles with two flotation cells 2, 2' positioned above a magnetic separator 3 angeord ^¬ are net. The magnetic separator 3 and the flotation cells 2, 2 'are preferably in a common support and / or

Housing device 4 arranged vertically stacked one above the other in a space-saving manner and connected to one another via a pipeline system such that the magnetic separator 3 and the flotation cells 2, 2 'can be flowed through by a recyclable material 10, 10' comprising at least a portion of the magnetic and / or magnetizable particles is. Here, the flotation cells 2, 2 ^{'are installed} above the magnetic separator 3. Between the flotation cells 2, 2 'and the magnetic separator 3, a guide 7 is arranged, which flows through the material flow 10. The guide device 7 is set up to impart to the waste stream 10 a swirl which dissolves contained agglomerates of magnetic and / or magnetizable particles as well as non-magnetic and / or non-magnetizable particles. The guide 7 is formed here for example by a piece of pipe with a helical baffle insert and integrated into the piping system.

The suspension 9 is injected into the flotation cells 2, 2 'and in a Wertstoffström 10 containing magnetic

and / or magnetizable particles and a respective waste stream 11 containing non-magnetic and / or non-magnetisable particles separated. The waste stream 11 flows in each case via a Schaumsammeirinne not shown here in detail. The recyclable material flow 10 from the flotation cells 2, 2 ', which are configured in particular as hybrid flotation cells, now flows via a tampon valve 6 down into the magnetic separator 3, where a further separation of the valuable material flow 10 into a still higher-quality recyclable material flow 10' and another Waste stream 11 'takes place. Due to the arrangement of the flotation cells 2, 2 'and the magnetic separator 3 to each other, the space requirement of the device 1' on the foundation 5 is extremely low and the flow ^¬ direction of the suspension 9 from top to bottom towards the foundation can be exploited without using pumps would have to be.

4 shows schematically a third device 1 '' for separating magnetic and / or magnetizable particles from a suspension 9 further comprising non-magnetic and / or non-magnetizable particles with a Magnetsepa ^¬ rator 3, which is arranged above a flotation cell 2. The magnetic separator 3 and the flotation cell 2 are stacked vertically stacked in a common support and / or housing device 4 and interconnected via a pipe ^¬ line system, such that the magnetic separator 3 as well as the flotation cell 2 of a value ^¬ stoffström 10, 10th 'comprising at least a portion of the magnetic and / or magnetis ^¬ magnetizable particles is flowed through. Here, the magnetic separator 3 is installed above the flotation cell 2. The suspension 9 is introduced into the magnetic separator 3, and 'containing magnetic ^¬ tables and / or magnetizable particles as well as one from ^¬ downdraft 11' in a Wertstoffström 10 containing non-magnetic and / or non-magnetizable particles separated. The Wertstoffström 10 'from the magnetic separator 3 d then flows downwardly in the flotation cell 2, in particular on its ejector, where a wide ^¬ re separating the valuable substance stream 10' in an even higher quality Wertstoffström 10 and a further waste stream 11 takes place.

Due to the arrangement of the flotation cell 2 and the magnet ^¬ separator 3 to each other, the space requirement of the device 1 '' on the foundation 5 is extremely low and the flow direction of the suspension 9 from top to bottom towards the foundation can be exploited without pumps would have to be used , 5 shows schematically a fourth apparatus] _ ''_'TO m separating magnetic and / or magnetizable particles from a suspension 9 further containing non-magnetic and / or non-magnetizable particles with two Magnetsepa- generators 3, 3', above a Flotation cell 2 angeord ^¬ net are. The magnetic separators 3, 3 'and the flotation cell 2 are stacked vertically stacked in a common support and / or housing device 4 and interconnected via a piping system, such that the magnetic separators 3, 3' as well as the flotation cell 2 of a Wertstoffström 10th , 10 'comprising at least a portion of the magnetic and / or magnetizable particles can be flowed through. Here, the magnetic separators 3, 3 'are installed above the flotation cell 2. The suspension 9 'and introduced into a Wertstoffström 10' in the magnetic separators 3, 3 containing non-magnetic and / or non-magnetizable particles ge separates ^¬ containing magnetic and / or magnetisable particles, as well as a respective waste stream 11 '. The recyclable material flow 10 'from the magnetic separators 3, 3' now flows down into the flotation cell 2, where further separation of the valuable material stream 10 'into a still higher-quality recyclable material stream 10 and a further waste stream 11 takes place. Due to the arrangement of the flotation cell 2 and the magnetic ^¬ separators 3, 3 'to each other, the space requirement of the device] _''' on the foundation 5 is extremely low and the flow direction of the suspension 9 from top to bottom towards the foundation can be exploited without that pumps would have to be used.

Figures 1 to 5 show only examples of the device according to the invention. Thus, the number of magnetic separators, the flotation cells and their arrangement to each other within the scope of the invention vary. Also, the positioning of the magnetic separators and flotation cells to each other can vary within wide limits, as long as the concept that a space-saving arrangement with vertical stacking selected is, is respected. The illustrated devices are particularly suitable for the separation of ore suspensions, in particular of iron ore suspensions, in which the valuable stream usually leaves the flotation cell through the lower outlet and not via the foam collecting flutes 2c.

Claims

claims

1. Device (1,1 ', 1' ', 1' '') for separating magnetic and / or magnetizable particles from a suspension (9) further comprising non-magnetic and / or non-magnetizable particles comprising

- At least one magnetic separator (3, 3 ^' ) and

at least one flotation cell (2, 2 ^' ),

characterized in that the at least one Magnetsepa- rator (3, 3 ^' ) and the at least one flotation cell (2, 2 ^' ) are arranged vertically stacked and interconnected via a piping system, such that the at least one magnetic separator (3, 3 ^') as well as the min ^¬ least a flotation cell (2, ^2') (at least one Wertstoffström 10, 10 ^') comprising flow through at least a portion of the magnetic and / or magnetizable particles.

2. Apparatus according to claim 1,

characterized in that the at least one flotation cell ^¬ (2, 2 ^') at least one magnetic ^¬ separators (3, 3 vertically above ^the') is arranged.

3. Apparatus according to claim 2,

characterized in that a flotation cell (2) is arranged perpendicular ^¬ right above a magnetic separator (3).

4. Apparatus according to claim 3,

characterized in that at least one pad valve (5) between the flotation cell (2) and the magnetic separator (3) is arranged, through which the Wertstoffström (10, 10 ^' ) of the flotation cell (2) in the magnetic separator (3) can be transferred.

5. Apparatus according to claim 1,

characterized in that the at least one Magnetsepa ^¬ rator (3, 3 ^' ) vertically above the at least one Flota ^¬ tion cell (2, 2 ^' ) is arranged.

6. Apparatus according to claim 5,

characterized in that a magnetic separator (3) is arranged vertically above a flotation cell (2).

7. Apparatus according to claim 5 or 6,

characterized in that the at least one flotation ^¬ cell (2, 2 ') at least one ejector (2b) for injecting the at least one value of the material stream (9) in a flotation chamber (2a) of the flotation cell (2, ^2' comprises), said Magnetse - Parator (3, 3 ') via the piping system with the at least one ejector (2b) is connected.

8. Device according to one of claims 1 to 7,

characterized in that the at least one Magnetsepa- rator (3, 3 ') is formed by a Trommelseparator.

9. Device according to one of claims 1 to 8,

characterized in that the at least one flotation cell ^¬ (2, 2 ^') formed by a Hybridflotationszelle.

10. Device according to one of claims 1 to 9,

characterized in that between the at least one magnetic separator (3, 3 ^') and the at least one flotation cell ^¬ (2, ^2') at least one guide device (7) for

Passing the value of the material stream (10, 10 ^') and for the generation of a turbulent flow in the supply ^¬ Wertstoffström (10, 10') are arranged.

11. Device according to one of claims 1 to 10,

characterized in that the at least one Magnetsepa ^¬ rator (3, 3 ^' ) and the at least one flotation cell (2, 2 ^' ) in a common support and / or housing means (4) are arranged vertically stacked.

12. Use of a device (1, 1 ', 1 ^'' , 1''^'' ) according to any one of claims 1 to 11 for the separation of magnetic and / or magnetizable ore particles from a suspension (9), in particular iron ore suspension, further containing non-magnetic and / or non-magnetizable particles.