WO2012083399A1 - Electromagnetic carousel separator - Google Patents

Abstract

The present invention relates to an electromagnetic carousel separator (1) comprising: a first set of superposed vertical rotors (10) including at least a bottom rotor (12) and a top rotor (13), the first set of superposed vertical rotors (10) being mounted on a first vertical shaft (9); and a second set of vertical rotors (10a) including at least a bottom rotor (12a) and a top rotor (13a), the second set of superposed vertical rotors (10a) being mounted on a second vertical shaft (9a). The first and second set of rotors (10, 10a) are joined side by side.

Description

 Report of the Invention Patent for "CARROSSEL TYPE ELECTRIC MAGNETIC SEPARATOR"

 Field of the invention

 The present invention relates to a type of equipment identified as a high intensity wet carousel electromagnetic separator applied in ore treatment and having four round shaped rotors arranged in two sets with two rotors each joined together. side by side and which generates magnetic fields from zero to 15,000 gauss (1,5 tesla).

 More precisely, the present invention relates to a high intensity wet carousel electromagnetic separator having two sets of two rotors each side by side, making a total of four rotors, the separator being generates adjustable magnetic fields from zero to 15,000 gauss (1,5 tesla) when using 2.5mm spaced arrays.

 Fundamentals of the invention

 High intensity wet carousel electromagnetic separators, which we call here simply as electromagnetic carousel separator or separator, have long been known in the market, with commercially available Separators having only one or two rotors and two or four equal coils of the same wattage.

 As its name implies, this type of equipment is intended to separate the ferrous minerals constituting the magnetizable part of an ore from the non-ferrous minerals constituting the non-magnetizable part of the ore. Magnetization and the consequent separation of ferrous minerals from the ore occurs through the action of a magnetic field generated by the circulation of an electric current in the equipment's coils.

 Generally speaking, a carousel-type electromagnetic separator comprises a rotor (or two rotors in the two-rotor design) disposed between two diametrically opposed magnetic field generating coils, which rotor is associated with a vertical axis passing through the your center.

 Thus, because the vertical axis is connected to a motor, the axis is driven and causes the rotor to rotate.

 Along the entire edge of the rotor peripheral region, several sets or blocks of steel plates are mounted side by side, parallel to each other, vertically, with small spaces between them, which are called dies.

The most common spacing between arrays is 2.5mm, however they are available in other spacings, for example 1.0mm, 1.5mm, 3.2mm, 3.8mm and 5.0mm and other intermediate spaces, which are chosen according to the size of the ore, the spacing should be larger than the largest ore particle to allow all ore to pass through the space between them.

 The matrices are magnetically induced by the magnetic field generated by the coils and become magnetized. Thus, when the equipment is in operation, with the ore with water being fed to them, the matrices retain inside, in the space between them, by the action of the magnetic field, the magnetizable ferrous part of the ore.

 As the rotor rotates, the ore mixed with water in pulp is fed over the peripheral region of the rotor, that is, over the dies, and this feed is made in the area of action of the magnetic field, which is in front of the coils.

 Thus, the ore pulp fed in front of the equipment's coils enters gravity inside the dies and as the rotor rotates it is separated between a magnetizable ferrous part which is retained in the dies which are induced by the magnetic field, and a nonferrous, nonmagnetizable part which is not influenced by the magnetic field and passes between them.

 Thus, when the dies are in front of the coils, the non-magnetizable part descends by gravity, passing between the spaces of the dies, and is collected by the non-magnetic collection chute, positioned under the rotor, below the dies. The discharge of the non-magnetizable part is assisted by the injection of low pressure water jets into the dies.

 With the rotor rotating in operation, the dies that hold the magnetizable part of the ore exit the magnetic field acting region in front of the coils and then the magnetizable part is discharged by the injection of high pressure water jets. applied to the matrices. High-pressure water jets "break" the magnetic force that holds the ferrous, magnetizable minerals to the arrays, causing them to detach and fall downward and to be collected by the magnetic pickup chute.

 The magnetizable part of the ore, composed of ferrous minerals such as hematite and others, when it corresponds to the desired part of the ore, for example in the application of iron ore concentration, is called concentrate. In this case, the non-magnetizable part of the ore, which passes through the matrices without being retained and which comprises non-ferrous minerals such as silica (sand), alumina and others, corresponding to the unwanted part of the ore, is called I reject.

In some applications, the reverse occurs. The desired part of the ore is that composed of non-ferrous minerals, such as when treating phosphate ore, where it is desired to reduce the volume of ferrous minerals contained in phosphate, which improves the quality of this product.

 In this type of application, the part of non-ferrous minerals, composed of phosphate mineral, which is not magnetizable and therefore does not retain the magnetic charge generated by the separator coils, passes through the matrices without being retained by them, being discharged into the non-magnetic collection channel is called concentrate. The other part, composed of ferrous minerals that are influenced by the magnetic field, is retained in the matrices and is discharged by high-pressure water jets on the magnetic collecting chute, is called tailings.

 In the rotor regions that are farthest from the coils, thus far from the magnetic field operating area, the magnetic field level is quite low. Because of this, it is in these regions where ferrous minerals retained to the matrices are discharged, and the discharge assisted by the injection of high pressure water jets, directed from top to bottom on the matrices. Water jets are necessary, since even with the low level of the magnetic field acting in this region, the ferrous minerals when they pass in front of the coils, are magnetically induced, acquiring a magnetic charge, which causes them to be retained at steel plates that make up the matrices and therefore do not naturally come loose from them.

 In addition to the high pressure water jets, the separators have low pressure water jets positioned just after the ore feed points in front of the coils. These low pressure jets are intended to facilitate the flow and discharge of nonferrous minerals passing through the dies in the direction of travel to the dump located below the rotor under the dies.

 Description of the prior art

 An example of a carousel type electromagnetic separator such as that described above can be found in US 3,830,367.

 This document describes a separator with two vertical rotors, each rotor having two coils of the same size and power, making a total of four equal coils. The four coils are electrically connected to each other and the magnetic field generated by them is driven through steel plates called the pole magnetic circuit, to the lower and upper rotor matrix blocks, as can be seen in figure 4 of US document 3,830,367.

Another example of a prior art carousel electromagnetic separator can be found in US 3,869,379 which relates to a separator having two upper and lower rotors positioned one above the other. and fixed to a central vertical axis which is rotated by a motor.

 The separator described in that U.S. patent comprises a set of dies mounted along the rotor perimeter, the dies consisting of small vertically mounted steel plates spaced apart with small spaces.

 In the separator of this document, the spaces between the lower rotor die plates are offset, or offset, from the upper rotor plate spaces.

 Another example of the prior art can be found in Brazilian document PI 0702097-0, which relates to a carousel-type electromagnetic separator whose pole dimensions (part of the magnetic circuit mounted in front of the coils) can be adjusted in in whole or in part, by assembling or disassembling fixed or variable size pole complements in order to modify the magnetic coverage area of the poles on the rotors, allowing the adjustment of the ideal magnetic and physical conditions to the process .

 State-of-the-art carousel electromagnetic separators, for the most part, comprise equipment with one or two vertical rotors and two or four coils of the same power, which generate magnetic fields of up to 10,000 gauss (1 tesla). 10,000 gauss (1 tesla) measured with 2.5mm spaced arrays.

 This 2.5mm spacing is usually used as a reference when informing the maximum magnetic field as well as the maximum capacity the separator reaches.

 However, if the same separator uses matrices with spacing less than 2.5mm, the maximum magnetic field will be larger the smaller the matrix spacing. Conversely, the maximum magnetic field will be smaller the larger the spacing of the matrices used in the separator.

 Thus, if a single separator that reaches the maximum magnetic field of 10,000 gauss (1 tesla) with 2.5mm matrices, had the matrices replaced by matrices with smaller spacing, for example, 1.0mm, the maximum magnetic field measured at their arrays would be larger, from approximately 10,500 gauss (1,05 tesla) to 11,000 gauss (1,1 tesla). On the other hand, if the 2.5mm arrays were replaced with 5.0mm spaced arrays, the maximum magnetic field in the arrays would be approximately 8,000 gauss (0.8 tesla) to 9,000 (0.9 tesla) gauss or smaller.

With regard to capacity, there is also variation in capacity, if instead of separator using matrices with the 2.5mm spacing, used as reference, use use matrices with larger or smaller spacing.

 Thus, if a single separator that reaches, for example, a maximum capacity of 150 tonnes per hour when processing a particular ore using 2.5mm dies, would have the dies replaced by dies with smaller spacing, for example, 1.0mm, and if applied in the same ore processing, as there would be less space for the ore to pass, its capacity could be reduced for example to 100 or 120 tons per hour. On the other hand, if the 2.5mm dies were replaced by larger spaced dies, for example 5.0mm, the processing capacity with the same ore would be increased and could reach more than 200 tons per hour.

 However as explained in the previous paragraphs, if matrices with spacing greater than 2.5mm are used, the magnetic field will be smaller and part of the ore will be lost due to the lower magnetic field, with consequent loss of separator efficiency and generation. of losses.

 State-of-the-art separators, designed several years ago, have a number of disadvantages as described below.

 There is currently an excessive demand for ore, especially iron ore, so that ore producers have had the need for high capacity separators to process large volumes of ore and at the same time generate equal magnetic fields. or greater than 10,000 gauss (1 tesla) measured with matrices with 2.5mm spacing between plates.

 With regard to the magnetic field, the demand for separators with higher magnetic fields stems from the greater recovery of the desired ferrous minerals contained in the ore as the magnetic field is larger, on the other hand, there is a loss of ferrous minerals. as the magnetic field is being reduced.

 As for capacity, prior art separators generally achieve a relatively low maximum feed capacity, ie about 150 to 200 tonnes per hour for iron ore processing when using spaced-off matrices. 2.5mm. Given this relatively low capacity per separator, if state-of-the-art separators were used in current large mining projects, a large number of such equipment would have to be employed to meet ore production.

On the other hand, if separators were applied even at capacities greater than 150 to 200 tonnes per hour but generating low magnetic fields, for example below 0.000 gauss (1 tesla), there would be loss of part of the mini- ferrous minerals requiring 10,000 gauss (1 tesla) or more to separate, producing significant damage to mining.

 The use of a large number of prior art separators is not advantageous for the following reasons.

 First of all, a state-of-the-art separator of the usual industrial size is a large piece of equipment, which corresponds to approximately 7 meters long, 4 meters wide, 4 meters high. very high mass, in the order of 100 tons. Despite their large size and weight, the usual state of the art separators, as already mentioned, achieve a feed capacity of 150 to 200 tons per hour with 2.5mm dies. However, given that mining projects are currently in place to feed 8,000 tonnes of ore per hour, approximately 40 to 54 state-of-the-art separators would be needed to meet the aforementioned demand, which would pose a major problem in many respects. as these are large and heavy equipment.

 Secondly, because of the aforementioned relatively low capacity and the already stated need for a large number of state of the art separators to cater for high ore production, it would be necessary to have a huge building to house all industrial facilities, which should be large, to house a large number of equipment.

 Thus, the installation of a large ore production facility employing state-of-the-art separators would be very costly and would be of no advantage.

 Third, a large number of separators in an industrial facility likewise require a large number of peripheral components and equipment to feed the ore and collect concentrate and tailings from all separators.

 In this sense, it would be necessary to install a large number of slurry pumps to feed the ore to the separators, several slurry distributors, a large expanse of ore pipelines, several concentrates and tailings collection boxes among other components and equipment. peripherals to accommodate the large number of tabs, which would further burden the installation if prior art tabs were used.

Additional costs that indirectly involve an installation with a large number of tabs should also be considered when compared to an installation with a smaller number of tabs, both having the same production capacity. These additional costs include higher labor costs for equipment operation, as there is a need for a larger number of operators, additional equipment assembly costs and higher project costs, as well as greater difficulty in enable projects involving a greater number of machines and equipment.

 It should also be borne in mind that it is not enough to have a high production capacity facility with a relatively small number of separators if the separators generate low magnetic field level so that there is ore losses, ie the installation has poor performance.

 It should be added that the use of subterfuges to increase the capacity of state of the art separators, such as the use of matrices with large plate spacing, for example 5.0mm, thus much larger than the reference space 2.5mm , would significantly reduce the magnetic field as explained above.

 In this case, the lower the magnetic field level generated by the separators, the lower the separation efficiency of the ferrous minerals contained in the ore, with the consequent loss of them, which would cause losses and could even make the installation economically unfeasible.

 Thus, even if separators with capacities greater than 200 tonnes per hour were used, it would still be necessary to work with high magnetic fields. Thus, the use of a high capacity separator, but generating low magnetic fields, for example below 9,000 gauss (0.9 tesla), would result in the loss of part of ferrous minerals requiring a higher magnetic field to be significant losses, since for equipment processing above 200 tonnes per hour, the loss, even of a small percentage of the ore, for example of 1% (one per cent), corresponding to 2.0 tonnes per hour would correspond to a very high loss of 1,440 tonnes of ore within a month.

 Therefore, given the current characteristics of state of the art separators and in view of the growing demand from the mining market, there is a need for a technical solution that addresses and solves the problem of the relatively low capacity of current separators, but at the same time take care that a magnetic field level of 10,000 gauss (1 tesla) or greater is obtained with matrices spaced at 2.5mm so that no significant ore losses occur.

 Objectives of the invention

This invention aims to create a carbon-type electromagnetic separator high intensity wet track rossel comprising two sets of rotors, each set comprising at least two overlapping rotors, one upper and one lower, with the two rotor assemblies joined side by side, forming a double, single and compact, which achieves the same capacity as two state-of-the-art separators, but occupies an area of around 20% smaller and generates zero-adjustable magnetic fields up to 15,000 gauss (1,5 tesla) when using arrays spaced at 2.5mm.

 Summary of the invention

 The high intensity wet carousel electromagnetic separator object of this invention comprises two sets of side-by-side rotors, the first set comprising at least two overlapping rotors, one lower and one upper, the first being rotor assembly connected to a first motor driven vertical axis and a second rotor assembly comprising at least one lower rotor and an upper rotor, the second rotor assembly connected to a second vertical axis driven by a second motor , with the first and second rotor assemblies joined side by side.

 Each rotor has arrays mounted along the entire edge of its peripheral region.

 Brief Description of the Drawings

 The figures in Annex I to this document include:

Figure 1 is a front view of the separator of the present invention;

 Figure 2 is a view of the separator supporting structure of the present invention;

 Figure 3 is a partial top view of the separator of the present invention illustrating the magnetic circuit, ore feed box, coils, water sprays and matrix blocks.

 Figure 4 - Details of the separator rotor of the present invention showing the water sprays, die blocks and pulp ore feed box.

 Detailed Description of the Invention

 As can be seen from Figure 1, the wetted high intensity carousel electromagnetic separator (1) of the present invention comprises a support structure (2) which supports all components of the Separator (1).

In the preferred embodiment of the present invention, the supporting structure (2) is composed of two lateral vertical columns (3), a lower horizontal base (4) and an upper horizontal base (5), such that the two lateral vertical columns (3) are positioned between the two lateral ends of the lower horizontal base (4) and the upper horizontal base (5). The upper horizontal base (5) can be It is shown as welded steel beams, positioned parallel to the lower horizontal base (4), which is also embodied as welded steel beams.

 The present invention admits some variations to the support structure 2, with the embodiment mentioned herein and illustrated in fig. 2 being the preferred embodiment only.

 The upper horizontal base (5) supports on its upper face two drive systems (6 and 6a), each of these drive systems (6 and 6a) consisting of an electric motor (7 and 7a), a speed reducer (8 and 8a) and a vertical shaft (9 and 9a) supported on bearings with bearings.

 Each of the two vertical axes (9 and 9a) is connected to a set of rotors (10 and 10a) so that the rotors can be rotated from the motors (7 and 7a) rotation of the drive systems. The two vertical axes (9 and 9a) pass through the center of the two rotor sets (10 and 10a), so that each axis (9 and 9a) is responsible for rotating each of the two rotor sets (10 and 10a). .

 In addition, the first vertical axis (9) is connected to the first drive system (6) and the second vertical axis (9a) is connected to the second drive system (6a). Further details regarding the rotor assemblies (10 and 10a) are commented below.

 In addition to these features, the supporting structure (2) has means for facilitating access to the two rotor assemblies (10 and 10a).

 The upper horizontal base (5) is divided into two parts, one positioned over the first rotor assembly (10) and the other positioned over the second rotor assembly (10a). Thus, if any maintenance procedure is required, for example on the first rotor assembly (10), simply remove the upper horizontal base portion (5) which is positioned over the first rotor assembly (10) and there is no need to intervene in the upper horizontal base portion (5) which is positioned over the second rotor assembly (10a).

 On the upper horizontal base (5) of the support structure (2) is also mounted a pulp distributor (11), to feed the pulp ore in the separator (1), as well as a reservoir tank for the cooling oil of the coils, parts of the water pipe to feed the matrix wash water sprays, the coil cooling oil pump, the oil circulation pipe to the coils, among other components.

As can be seen from Figure 1, the separator (1) of the present invention comprises two sets of overlapping vertical rotors (10 and 10a). The first set of vertical rotors (10) is comprised of at least one lower rotor (12) and one upper rotor (13), which are supported by a first vertical central axis (9), as shown in FIG. previously mentioned.

 Similarly, the second set of overlapping vertical rotors (10a) is also composed of at least one lower rotor (12a) and an upper rotor (13a), also supported by a vertical central axis, in this case the second vertical axis ( 9a).

 In the preferred embodiment of the present invention, each set of overlapping vertical rotors (10 and 10a) comprises a lower rotor (12 and 12a) and an upper rotor (13 and 13a), that is, each rotor set is composed of two rotors. The two rotor assemblies 10 and 10a of the present invention are comprised of rotors of the same type used in prior art separators.

 In an alternate embodiment, each rotor assembly (10 and 10a) of the present invention may be comprised of up to four overlapping vertical rotors.

 According to Figure 1, it can be noted that the first and second set of overlapping vertical rotors (10 and 10a) are joined side by side, making it possible to form a compact, high capacity double carousel electromagnetic separator. because it incorporates four rotors.

 To achieve such compaction, in the preferred embodiment of the present invention, the separator (1) has six coils, two coils (14) mounted on the left side of the first rotor assembly (10), two coils (14a) mounted on the right side of the rotor. second rotor assembly (10a) and two intermediate coils (15) mounted between the two rotor assemblies (10 and 10a).

 Thus, as can be seen from Figures 1 and 2, the upper rotor (13) of the first rotor assembly (10) has its upper intermediate coil (15) shared with the upper rotor (13a) of the second rotor assembly. rotors (10a), as well as the lower rotor (12) of the first rotor assembly (10) has the lower middle coil (15) shared with the lower rotor (12a) of the second rotor assembly (10a).

 Thus, each of the rotors 12, 12a, 13 and 13a is magnetically serviced by two coils positioned at their diametrically opposite ends. In the first rotor assembly, the rotors are magnetically serviced by a left side coil (14) and an intermediate coil (15), while in the second rotor assembly, the rotors are magnetically served by a side coil (14a) and a intermediate coil (15). In this way, the intermediate coils (15) are positioned between the two rotor assemblies (10 and 10a).

The six-coil assembly consisting of the two intermediate coils (15) positioned between the two rotor assemblies (10 and 10a) together with the four side coils (14 and 14a) positioned next to the two side vertical columns (3) of the is responsible for the generation of the magnetic field that is induced on the matrix blocks of the four rotors (12, 12a, 13 and 13a).

 Although the separator of the present invention is provided with four rotors and six coils in their preferred embodiment, these numbers may vary. Thus, depending on the number of rotors employed in the separator (1) of the present invention (greater or less than four), the number of coils may also vary (greater or less than six).

 As with prior art separators, the magnetic field generated by the coils (14, 14a and 15) of the carousel electromagnetic separator (1) of the present invention is also conducted to the matrix blocks by a set of steel plates magnetic circuit, so that the coils are mounted relative to the magnetic circuit, as illustrated in Figure 4 of US 3,830,367.

 However, in the case of the present invention, the magnetic circuit (23) has a different design with respect to the magnetic circuit of the state of the art separators, especially since the separator (1) of the present invention has in addition to the side coils. (14, 14a) also have intermediate coils (15), so that the magnetic circuit (23) in this case must conduct the magnetic field of both side coils (14, 14a) and intermediate coils (15).

 The magnetic circuit (23) in the case of the separator of the present invention is formed by a set of steel plates and poles, which conduct the magnetic field of the six coils (14, 14a, 15) to the ore separation area. , in the dies (20), being made of low carbon carbon steel plates with high magnetic permeability, with the plates mounted in a compact system with a minimum number of parts, to reduce joint areas and with the perfectly adjusted plates in order to avoid losses in the magnetic field conduction to the dies (20).

 As previously mentioned, the dies (20) are mounted along the edge of the peripheral region of the rotors (12, 12a, 13 and 13a). See details of the matrices in fig.4.

 In the embodiment of fig. 1, the Separator (1) has six coils (14, 14a, 15), two of which are diametrically opposed to the upper rotor and the other two also diametrically opposite to the lower rotor as mentioned above. The six coils are interconnected, operating together, and summing the magnetic fields generated by them.

The coils (14, 14a, 15) are constructed of copper, material with a high level of electrical conductivity, allowing the equipment to reach a magnetic field level of up to 15,000 gauss (1.5 tesla) with 2.5-plate spacing arrays. mm, When the 2.5mm matrix set is replaced by the same equipment with another matrix set with plate spaces less than 2.5mm, eg 1.0mm, the magnetic field will automatically be larger and can reach up to approx. 16,000 gauss (1,6 tesla), and in order to reach this level of magnetic field, copper coils must be used.

 Coils made of aluminum, material commonly used in state-of-the-art separators, can generate only 60% to 80% of this magnetic field level and have a shorter service life because they operate at a higher temperature, since aluminum has a higher electrical resistance than of copper.

 The separator (1) of the present invention, in addition to being constructed with copper coils, in an alternative embodiment, may be constructed with aluminum coils.

 The separator (1) is provided with an electric-electronic control panel that controls the intensity of the electric current applied to the coils (14, 14a, 15), allowing the magnetic field level of the separator (1) to be adjusted. from 0 (zero) to 15,000 gauss (1,5 tesla) when separator (1) is using matrices with spacing between the 2.5mm matrix plates.

 To achieve a magnetic field balance between the six coils (14, 14a, 15) of the separator (1), so that the magnetic field reaches the high level of magnetic intensity of up to 15,000 gauss (1,5 tesla). , with arrays with 2.5mm aperture plates and while the arrays of all rotors receive the same level of magnetic field, each of the intermediate coils (15) that interact with two of the side coils (14, 14a) has approximately 50% (fifty percent) more amps than each side coil (14, 14a), enabling intermediate coils to generate higher magnetic power and magnetic flux than side coils (14, 14a) .

 In the embodiment of FIG. 1, the larger number of amp turns of the intermediate coils (15) of the separator (1) allows the two intermediate coils (15) to act together with the four side coils (14, 14a), which they have a lower number of coil amps, without loss of magnetic field in the arrays, thus enabling the same level of magnetic field to be obtained in the arrays of the four rotors (12, 13, 12a, 13a).

The separator (1) of the present invention also has a centralized cooling system (18) of the coils (14, 14a, 15), consisting of an oil and water plate heat exchanger, oil circulation pump, oil piping, heat exchanger cooling water piping, and flow watch type safety system, allowing coils (14, 14a and 15) to operate within the rated temperature determined in design, ensuring a longer service life of the coils and at the same time greater magnetic efficiency of the equipment.

 The separator cooling system (1) is an extremely important element as it allows the coils (14, 14a, 15) to operate at low temperatures while providing high magnetic output even in continuous operation as well as long life. useful as the coils do not operate overheated.

 In a variation of the preferred embodiment of the separator (1), the coil cooling system may consist of fans or any other cooling system which enables the coil temperature to be reduced.

 In another variation of the preferred embodiment of separator (1), the coils may be constructed of aluminum.

 In yet another variation of the preferred embodiment of separator (1), the coils may be constructed of aluminum or copper and reach maximum magnetic fields of less than 15,000 gauss (1,5 tesla).

 With respect to operation, the separator (1) of the present invention differs from the prior art separators with respect to the number of ore feed points.

 The separator (1) of the present invention has twice the number of feed points than prior art separators. Thus, the slurry ore from the pulp dispenser (11) is fed simultaneously via piping into four feeder boxes (19) arranged on the first rotor assembly (12, 13) and into four other feeder boxes. 19a arranged on the second rotor assembly (12a, 13a). From this, the ore flows by gravity to the peripheral region of the four rotors (12, 12a, 13, 13a), where the dies (20) are located and into the dies (20), being fed in front of them. to the coils (14, 14a and 15) in the region of operation of the magnetic field.

 With the rotors (12, 12a, 13, 13a) operating in rotation, as the non-ferrous, non-magnetizable minerals are fed into the matrices they pass in the spaces between them as they are not captured by the action of the magnetic field. and descent by gravity, being discharged over each of the four collection chutes (16) arranged under each rotor (12, 12a, 13 and 13a) in the tailings collection region.

 The discharge of non-ferrous minerals, which are non-magnetizable and which are usually referred to as tailings, is facilitated by the injection of low-pressure water jets (21), directed downwards, over the dies.

With the rotor rotating, the dies leave the operating region of the magnetic field in front of the coils (14, 14a and 15). At this point, the matrices are already free of the nonferrous minerals, unloaded from them, but they still contain It has ferrous minerals.

 With the rotor rotating and when the dies are at a distance between the two coils servicing each rotor, said coils (14, 14a and 15) receive a high pressure water jet (22) thereon, whose function is to "break" the force of the remaining magnetic field that still acts on the particles of ferrous minerals, even though they are already outside the region of action of the magnetic field, allowing the ferrous minerals, usually called concentrated, to be discharged. over the collection chute (16), in a magnetic collection region, also called the concentrate collection region.

 Since each rotor (12, 12a, 13, 13a) is serviced by two coils and ore is fed in front of each coil, each rotor has two feed points.

 Whereas the separator (1) of the present invention has twice the number of rotors of the prior art separators, the separator (1) of the present invention processes twice the capacity.

 As can be seen, the separator (1) of the present invention has a compact structure, joining two prior art separators in a single apparatus. To achieve this, the present invention utilizes intermediate coils (15) which simultaneously serve the rotors of the first rotor assembly (10) and the rotors of the second rotor assembly (10a).

 As a result, the separator (1) of the present invention achieves the same capacity as two prior art two-rotor separators, but occupying an area of about 20% smaller than two prior art separators arranged side by side. side.

 In addition, since the separator (1) of the present invention has about 100% greater processing capacity than a prior art two-rotor separator (considering the same diameter of the rotors), one may use in a given industrial facility, half the number of equipment.

 The use of half the number of equipment, the consequent need for a smaller installation area, and fewer peripheral components such as ore feed pumps, pulp dispensers, piping, tailings and concentrate collection boxes among others, they are elements that show the innovation and great advantage of the separator (1) of the present invention, compared to the conventional separators of the state of the art.

Therefore, the present invention fully achieves its intended purpose, thereby filling the gap in the state of the art. Having described a preferred embodiment example, it should be understood that the scope of the present invention encompasses other possible variations and is limited only by the content of the appended claims, including the possible equivalents thereof.

Claims

 1 . Carousel-type electromagnetic separator (1), characterized by the fact that it comprises:  a first set of overlapping vertical rotors (10) composed of at least one lower rotor (12) and an upper rotor (13), said first set of overlapping vertical rotors (10) being supported by a first vertical axis (9) ;  a second set of overlapping vertical rotors (10a), comprising at least one lower rotor (12a) and an upper rotor (13a), said second set of overlapping vertical rotors (10a) supported by a second vertical axis (9a) ;  each of the rotors (12, 12a, 13 and 13a) has dies (20) mounted in their peripheral regions along their edges;  the first and second rotor assemblies (10, 10a) are joined side by side.  Carousel type electromagnetic separator (1) according to claim 1, characterized by the fact that the arrays of each rotor of the rotor assemblies (10, 10a) are magnetized by the magnetic field generated by two coils (14,15 or 14a, 15), one side coil (14 or 14a) and an intermediate coil (15), the same intermediate coil (15) magnetically serving a rotor (12, 13) of the first rotor assembly (10) and a rotor (12a, 13a) of the second rotor assembly (10a ).  Carousel type electromagnetic separator (1) according to claim 1, Characterized by the fact that the first vertical axis (9) is connected to a first motor (7) and the second vertical axis (9a) is connected to a second motor (7a).  Carousel type electromagnetic separator (1) according to claim 2, characterized in that it comprises a support structure (2) having two lateral columns (3), a lower horizontal base (4) and an upper horizontal base (5), the two lateral columns (3) being positioned between the lower and upper bases, the side coils (14, 14a) being arranged close to the side columns (3) of the supporting structure (2) and the intermediate coils (15) being arranged between the first and the second rotor assembly (10, 10a).  Carousel type electromagnetic separator (1) according to Claim 4, characterized in that the upper horizontal base (5) is divided into two parts.  Carousel type electromagnetic separator (1) according to claim 2, CHARACTERIZED by the fact that each of the intermediate coils (15) has approximately fifty percent (50%) more amps than to each of the side coils (14, 14a).  Carousel type electromagnetic separator (1) according to claim 2, characterized in that the coils can generate a magnetic field from 0 (zero) to 15,000 gauss (1,5 tesla) when the separator (1) is using dies with space between 2.5mm dies plates.