AU2013231790A1

AU2013231790A1 - Double-cylinder superconducting magnetic separation device used for kaolin

Info

Publication number: AU2013231790A1
Application number: AU2013231790A
Authority: AU
Inventors: Peiyong Li; Meifen WANG; Zhaolian Wang; Huan Yang; Yiting ZHANG; Zian ZHU
Original assignee: WEIFANG XINLI SUPERCONDUCTING MAGNET TECHNOLOGY CO Ltd; Institute of High Energy Physics of CAS
Current assignee: WEIFANG XINLI SUPERCONDUCTING MAGNET TECHNOLOGY Co Ltd; Institute of High Energy Physics of CAS
Priority date: 2012-03-13
Filing date: 2013-03-11
Publication date: 2014-09-11
Anticipated expiration: 2033-03-11
Also published as: CN102600970A; BG111828A; AU2013231790B2; ZA201406546B; BG66890B1; UA111271C2; CN102600970B; WO2013135152A1

Abstract

A double-cylinder superconducting magnetic separation device used for kaolin comprises a superconducting magnet system, a separation system and a feeding system. The superconducting magnet system comprises a superconducting magnet; liquid helium used for cooling the superconducting magnet; and an iron shield which covers the exterior of the superconducting magnet, a separation cavity being arranged in the iron shield in an axial direction thereof. The separation system comprises a bracket; two magnetic separation rollers which are both arranged on the bracket, are respectively located at either side of the separation cavity, and can alternately enter the separation cavity, a magnetic medium being arranged in each magnetic separation roller; a drive device which drives the magnetic separation rollers to move back and forth; and closed-loop magnetic circuit communicating devices each of which is arranged at one end of each magnetic separation roller which is close to the separation cavity. The feeding system comprises a feeding tank which is used for introducing to the magnetic separation rollers slurry required to be separated; and a water injection tank which is used for introducing to the magnetic separation rollers water used for cleaning same. The double-cylinder superconducting magnetic separation device achieves continuous production, and thus increases the production efficiency.

Description

English Translation of PCT/CN2013/072397 DOUBLE-CYLINDER SUPERCONDUCTING MAGNETIC SEPARATION DEVICE USED FOR KAOLIN [0001] This application claims the benefit of priority to Chinese Patent Application No. 201210065971.5 titled "DOUBLE-CYLINDER SUPERCONDUCTING MAGNETIC 5 SEPARATION DEVICE FOR KAOLIN", filed with Chinese State Intellectual Property Office on March 13, 2012, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD [0002] The present application relates to the technical field of magnetic separation devices, and particularly relates to a double-cylinder superconducting magnetic separation device for 10 kaolin. BACKGROUND [0003] China, as a large producer of non-metallic minerals, is rich in non-metallic mineral deposits, such as Kaolin, potassium and sodium feldspar, and quartz, and the Kaolin resource of China plays a very important role in the worldwide non-metallic mineral production. However, 15 most of these minerals contain deleterious substances, such as iron. In order to improve the quality of the non-metallic minerals, the iron content has to be lowered. Therefore, iron removal is a main problem in the purification process of non-metallic minerals. [0004] Currently, a high gradient magnetic separator is generally used in this industry for removing iron in the non-metallic minerals, which fills mediums, such as magnetic-conducting 20 stainless steel wool or steel screen, in a magnetic field inside a solenoid as the separation medium. These mediums, when being magnetized to a saturated state, can generate high magnetic field gradient and intensity and has a large capture area, thereby having a wide application range. [0005] In the conventional high gradient magnetic separator, the cycle for processing the ore 1 English Translation of PCT/CN2013/072397 slurry includes the following four operation conditions, preparing, processing, cleaning, and waiting. Due to the waiting operation condition, the working coefficient is only in a range of 75% to 83%, i.e., the processing operation is an intermittent production and has around 20% invalid working time, thus the production efficiency is low. 5 [0006] Further, the intensity of magnetic field of the above high gradient magnetic separator is difficult to be increased, and can only reach about 1.6x106 A/m (the corresponding magnetic induction intensity is 2T), which approximates the saturated magnetic field of the iron yoke, thus the separation range is limited. In addition, for generating the magnetic field of 2T, the high gradient magnetic separator requires about 260KW electricity power, which takes up 60% 10 of the processing expense of the mineral per ton, thus the power consumption thereof is large. Therefore, the conventional high gradient magnetic separator cannot produce the non-metallic mineral product having a desired quality level, and also have a limited application range and an increased cost. [0007] Therefore, a technical problem to be solved presently by those skilled in the art is to 15 provide a double-cylinder superconducting magnetic separation device for kaolin, which may realize a continuous production and further improve the production efficiency. SUMMARY [0008] In view of this, an object of the present application is to provide a double-cylinder superconducting magnetic separation device for kaolin, which may realize a continuous 20 production and further improve the production efficiency. [0009] To achieve the above object, the present application provides the following technical solutions. [0010] A double-cylinder superconducting magnetic separation device for kaolin includes a superconducting magnet system, a separation system, and a feeding system; wherein, 25 the superconducting magnet system includes: a superconducting magnet; 2 English Translation of PCT/CN2013/072397 liquid helium for cooling the superconducting magnet; and an iron shield for covering the superconducting magnet, wherein a separation cavity is arranged in the iron shield in an axial direction of the iron shield; the separation system includes: 5 a bracket; two magnetic separation rollers which are both arranged on the bracket and are located at two sides of the separation cavity, respectively, and are configured to alternately enter the separation cavity, and magnetic medium is arranged in each of the magnetic separation rollers; 10 a drive device configured to drive the magnetic separation rollers to move reciprocally; and a closed-loop magnetic circuit communicating device, which is arranged on each of the magnetic separation rollers at an end close to the separation cavity; the feeding system includes: 15 a feeding tank for feeding slurry to be separated into the magnetic separation rollers; and a water injection tank for injecting water into the magnetic separation rollers for cleaning. [001-11 Preferably, in the double-cylinder superconducting magnetic separation device, the 20 superconducting magnet system further includes a refrigerating machine for cooling the superconducting magnet. [001-2 Preferably, in the double-cylinder superconducting magnetic separation device, the superconducting magnet system further includes a cooling shield for covering the superconducting magnet, and a cooling end of the refrigerating machine is arranged in the 25 cooling shield by passing though the iron shield. [001-3 Preferably, in the double-cylinder superconducting magnetic separation device, the superconducting magnet system further includes a housing for covering the superconducting magnet, and the housing is located in the cooling shield, and the liquid helium and the cooling 3 English Translation of PCT/CN2013/072397 end of the refrigerating machine are both arranged in the housing, and the liquid helium is circulated in a closed cycle in the housing. [001-4] Preferably, in the double-cylinder superconducting magnetic separation device, the superconducting magnet system further includes a dewar for covering the housing. 5 [0015] Preferably, in the double-cylinder superconducting magnetic separation device, two ends of the superconducting magnet are always connected to a positive pole and a negative pole of an external power via a current positive lead and a current negative lead, respectively. [0016] Preferably, in the double-cylinder superconducting magnetic separation device, an end, away from the separation cavity, of each of the magnetic separation rollers is connected to the 10 bracket via an organ pipe, and the organ pipe is telescopic in the axial direction of the iron shield. [001-7 Preferably, in the double-cylinder superconducting magnetic separation device, the drive device may be an electrical motor or a hydraulic cylinder. [0018] Preferably, in the double-cylinder superconducting magnetic separation device, the 15 magnetic medium includes steel wool and/or steel screen. [0019] Preferably, in the double-cylinder superconducting magnetic separation device, the superconducting magnet may be a solenoid superconducting magnet. [0020] The double-cylinder superconducting magnetic separation device for kaolin according to the present application includes a superconducting magnet system, a separation system, and a 20 feeding system. The superconducting magnet system includes: a superconducting magnet; liquid helium for cooling the superconducting magnet; and an iron shield for covering the superconducting magnet, wherein a separation cavity is arranged in the iron shield in an axial direction of the iron shield. The separation system includes: a bracket; two magnetic separation rollers which are both arranged on the bracket and are located at two sides of the separation 25 cavity, respectively, and are configured to alternately enter the separation cavity, and magnetic medium is arranged in each of the magnetic separation rollers; a drive device configured to drive the magnetic separation rollers to move reciprocally; and a closed-loop magnetic circuit 4 English Translation of PCT/CN2013/072397 communicating device, which is arranged on each of the magnetic separation rollers at an end close to the separation cavity. The feeding system includes: a feeding tank for feeding slurry to be separated into the magnetic separation rollers; and a water injection tank for injecting water into the magnetic separation rollers for cleaning. 5 [002211 In the double-cylinder superconducting magnetic separation device for kaolin according to the present application, the closed-loop magnetic circuit communicating devices form a shield body together with the iron shield, and the iron shield restricts the magnetic field within the separation cavity for processing the slurry, thereby gathering the magnetic lines of force and reducing the stray field at the separation cavity. Therefore, the magnetic field 10 provided by the superconducting magnet is divided into two regions: a high magnetic field region at the separation cavity, which is configured to capture magnetic particles in the ore slurry raw material together with the magnetic medium, and is also referred to as a separation region; and a low magnetic field region outside the iron shield, which is configured to clean the magnetic particles and is also referred to as a cleaning region. Since the two magnetic 15 separation rollers alternately enter the separation cavity during the operation of the double-cylinder superconducting magnetic separation device, one of the magnetic separation rollers is located at the cleaning region, i.e., under a cleaning operation condition, when the other one of the magnetic separation rollers is located at the separation region, i.e., under a separation operation condition. 20 [0022] In conclusion, during the operation of the double-cylinder superconducting magnetic separation device for kaolin according to the present application, there is no waiting operation condition for processing the ore slurry, thereby achieving a continuous production and further improving the production efficiency. [00231 Secondly, in the double-cylinder superconducting magnetic separation device for 25 kaolin according to the present application, the intensity of magnetic field of the cleaning region is extremely low and may be below 50Gs, thus the magnetic particles captured by the magnetic medium may be easily washed away, which shortens the cleaning time, i.e., reduces the invalid operation time, and decreases the times of cleaning by high pressure water, and at 5 English Translation of PCT/CN2013/072397 the same time reduces the replacing frequency of the magnetic medium, and prolongs the service life of the magnetic medium. In addition, since the cleaning region is close to the separation region, a movement distance of the magnetic separation roller from the separation region to the cleaning region is shortened, which further reduces the invalid operation time. 5 BRIEF DESCRIPTION OF THE DRAWINGS [0024] For more clearly illustrating embodiments of the present application or the technical solution in the conventional technology, drawings referred to describe the embodiments or the conventional technology will be briefly described hereinafter. Apparently, the drawings in the following description are only several embodiments of the present application, and for the 10 person skilled in the art other drawings may be obtained based on these drawings without any creative efforts. [0025] Figure 1 is a structural schematic view of a double-cylinder superconducting magnetic separation device for kaolin according to an embodiment of the present application; [0026] Figure 2 is a sectional view of partial structure of a magnetic separation roller at the 15 left side under a cleaning operation condition of the double-cylinder superconducting magnetic separation device for kaolin according to the embodiment of the present application; [0027] Figure 3 is a sectional view of partial structure of a magnetic separation roller at the right under a cleaning operation condition of the double-cylinder superconducting magnetic separation device for kaolin according to the embodiment of the present application; and 20 [0028] Figure 4 is a sectional view of partial structure of a superconducting magnet system of the double-cylinder superconducting magnetic separation device according to the embodiment of the present application. DETAILED DESCRIPTION 25 [0029] Embodiments of the present application provide a double-cylinder superconducting 6 English Translation of PCT/CN2013/072397 magnetic separation device for Kaolin, which may realize a continuous production and further improve the production efficiency. [0030] The technical solutions in the embodiments of the present application will be described clearly and completely hereinafter in conjunction with the drawings in the embodiments of the 5 present application to make objects, technical solutions and advantages of the embodiments of the present application more clear. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all of other embodiments, made by the person skilled in the art without any creative efforts, fall into the scope of the present application. 10 [0031] Reference is made to Figures 1 to 4. Figure 1 is a structural schematic view of a double-cylinder superconducting magnetic separation device for kaolin according to an embodiment of the present application; Figure 2 is a sectional view of partial structure of a magnetic separation roller at the left side under a cleaning operation condition of the double-cylinder superconducting magnetic separation device for kaolin according to the 15 embodiment of the present application; Figure 3 is a sectional view of partial structure of a magnetic separation roller at the right side under a cleaning operation condition of the double-cylinder superconducting magnetic separation device for kaolin according to the embodiment of the present application; and Figure 4 is a sectional view of partial structure of a superconducting magnet system of the double-cylinder superconducting magnetic separation 20 device according to the embodiment of the present application. [0032] The double-cylinder superconducting magnetic separation device for kaolin according to an embodiment of the present application includes a superconducting magnet system, a separation system, and a feeding system. The superconducting magnet system includes a superconducting magnet 1, liquid helium 2 for cooling the superconducting magnet 1, and an 25 iron shield 11 for covering the superconducting magnet 1, and a separation cavity is provided in the iron shield 11 in an axial direction thereof. The separation system includes a bracket 9, two magnetic separation rollers 10 arranged on the bracket 9, a drive device 13 for driving the magnetic separation rollers 10 to move reciprocally, and a closed-loop magnetic circuit 7 English Translation of PCT/CN2013/072397 communicating device 14, and wherein, the two magnetic separation rollers 10 are arranged at two sides of the separation cavity, respectively, and may alternately enter the separation cavity, magnetic medium is arranged in each of the magnetic separation rollers 10, and the closed-loop magnetic circuit communicating device 14 is arranged on each of the magnetic separation 5 rollers 10 at an end close to the separation cavity. The feeding system includes a feeding tank 7 for feeding slurry to be separated into the magnetic separation rollers 10, and a water injection tank 8 for injecting water into the magnetic separation rollers 10 for cleaning the magnetic separation rollers 10. [0033] The function of the closed-loop magnetic circuit communicating device 14 is described 10 as follows. A passage is required to allow the magnetic separation rollers 10 to move, thus a separation cavity is required to be arranged in the iron shield 11, and in this case, the magnetic field generated by the superconducting magnet 1 cannot be fully utilized. In a case that the closed-loop magnetic circuit communicating devices 14 are provided, a closed magnetic circuit may be formed by the closed-loop magnetic circuit communicating devices 14 and the iron 15 shield 11, which encloses the magnetic lines of force generated by the superconducting magnet 1 inside the iron shield 11, thus the magnetic energy may be fully utilized, and the efficiency of the superconducting magnet 1 is maximized. [00341 The superconducting magnet is a magnet using superconducting wire as excitation coils, and may maintain a superconducting state under high magnetic field, thus the 20 superconducting magnet may conduct an extremely large current, i.e., having a high current density, and may meet requirements of high field intensity, high uniformity or high gradient. An additional current supply is provided to supply power to the superconducting magnet, and thus the increase or decrease of the magnetic field is convenient and safe. In principle, a closed-loop superconducting circuit may also be used and works with a superconducting switch. A stable 25 low temperature environment is required for the normal operation of the superconducting magnet. [0035] In the double-cylinder superconducting magnetic separation device for kaolin according to this embodiment, the closed-loop magnetic circuit communicating devices 14 form a shield body together with the iron shield 11, and the iron shield 11 restricts the magnetic field 8 English Translation of PCT/CN2013/072397 within the separation cavity for processing the slurry, thereby gathering the magnetic lines of force and reducing the stray field at the separation cavity. Therefore, the magnetic field provided by the superconducting magnet 1 is divided into two regions: a high magnetic field region at the separation cavity, which is configured to capture magnetic particles in the slurry 5 raw material together with the magnetic medium, and is also referred to as a separation region; and a low magnetic field region outside the iron shield 11, which is configured to clean the magnetic particles and is also referred to as a cleaning region. Since the two magnetic separation rollers 10 alternately enter the separation cavity during the operation of the double-cylinder superconducting magnetic separation device, one of the magnetic separation 10 rollers 10 is located at the cleaning region, i.e., under a cleaning operation condition, when the other one of the magnetic separation rollers 10 is located at the separation region, i.e., under a separation operation condition. [00361 As shown in Figure 2, which is a sectional view of partial structure of the magnetic separation roller at the left side under the cleaning operation condition, and at this time, the 15 magnetic separation roller 10 at the right side is under the separation operation condition. In this case, the magnetic separation roller 10 at the left side is located at the low magnetic field region outside the iron shield 11, the magnetic field intensity of the low magnetic field region is below 50Gs, and the magnetic particles captured on the magnetic medium inside the magnetic separation roller 10 may be easily washed away by injecting water into the magnetic separation 20 roller 10 via the water injection tank 8. At the same time, the magnetic separation roller 10 at the right side is located at the high magnetic field region in the separation cavity inside the iron shield 11, and the ore slurry to be separated is fed into the magnetic separation roller 10 at the right side via the feeding tank 7, and magnetic particles in the ore slurry are absorbed onto the magnetic medium, and then the magnetic separation roller 10 at the right side waits for the next 25 cleaning operation condition. 10037] While the magnetic separation device roller 10 at the left side is cleaned, the feeding tank 7 starts to feed slurry, and the drive device 13 drives the two magnetic separation rollers 10 to move rightwards together. At this time, the closed-loop magnetic shield formed by the iron shield 11 and the closed-loop magnetic circuit communicating devices 14 is broken, and the 9 English Translation of PCT/CN2013/072397 magnetic separation roller 10 at the left side immediately enters the high magnetic field region to perform the separating operation condition, and the magnetic separation roller 10 at the right side enters the low magnetic field region to perform the cleaning operation condition to wash away the magnetic particles captured in the earlier separating operation condition. Reference is 5 made to Figure 3, which is a sectional view of partial structure of the magnetic separation roller 10 at the right side under the cleaning operation condition. [00381 In conclusion, during the operation of the double-cylinder superconducting magnetic separation device for kaolin according to this embodiment, there is no waiting operation condition for processing the ore slurry, thereby achieving a continuous production and further 10 improving the production efficiency. [0039] Secondly, in the double-cylinder superconducting magnetic separation device for kaolin according to this embodiment, the intensity of magnetic field of the cleaning region is extremely low and may be below 50Gs, thus the magnetic particles captured by the magnetic medium may be easily washed away, which shortens the cleaning time, i.e., reduces the invalid 15 operation time, and decreases the times of cleaning by high pressure water, and at the same time reduces the replacing frequency of the magnetic medium, and prolongs the service life of the magnetic medium. In addition, since the cleaning region is close to the separation region, a movement distance of the magnetic separation roller 10 from the separation region to the cleaning region is shortened, which further reduces the invalid operation time. 20 [0040] Further, since the separation cavity is an interior space enclosed by the iron shield 11, the magnetic field thereof has a high intensity and is uniform, which maximizes the usage of the high background magnetic field generated by the superconducting magnet 1, and the superconducting magnet 1 may improve the concentrate grade and increase the processing capability. At the same time, since the two magnetic separation rollers 10 move simultaneously, 25 the electrical magnetic force is balanced, which reduces the requirement for the drive device 13. [0041] In addition, during the operation of the double-cylinder superconducting magnetic separation device, the magnet is in the superconducting state, the resistance thereof is close to zero, thus there is almost no power consumption, and compared to a conventional magnetic 10 English Translation of PCT/CN2013/072397 separation device, the power consumption may be decreased to 1/20, thereby further decreasing the power consumption and cost of the device. Besides, the intensity of the magnetic field may be significantly improved (may be higher than 6T), thus small particles of weak magnetic materials may be separated, which enlarges the separation range; and meanwhile, the diameter 5 of the processing passage may be greater than 1m, which may increase the producing capability of the device by 10 times. [0042] Preferably, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, the superconducting magnet system further includes a refrigerating machine 4 for cooling the superconducting magnet 1. The refrigerating 10 machine 4 and the liquid helium 2 form a cooling resource for the superconducting magnet 1, which may maintain the superconducting magnet 1 in a stable operating temperature, and further improve the operation quality. [0043] Further, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, the superconducting magnet system further includes a 15 cooling shield 6 for covering the superconducting magnet 1, and a cooling end of the refrigerating machine 4 is arranged in the cooling shield 6 by passing through the iron shield 11. At this time, the refrigerating machine 4 is also used for cooling the cooling shield 6, which may reduce the heat radiation leakage of the room temperature. [0044 In order to further optimize the above-described embodiments, the superconducting 20 magnet system further includes a housing 5 for covering the superconducting magnet 1, and the housing 5 is located in the cooling shield 6, and the liquid helium 2 and the cooling end of the refrigerating machine 4 are both arranged in the housing 5, and the liquid helium 2 is circulated in a closed cycle in the housing 5. At the same time, the cooling end of the refrigerating machine 4 re-condenses the gaseous helium volatilized from the liquid helium 2 into liquid, 25 which flows back into the housing 5 for continuously cooling the superconducting magnet 1; and as shown in Figure 4, the upward arrow refers to the flow direction of the gaseous helium volatilized from the liquid helium 2, and the downward arrow refers to the flow direction of the liquid condensed from the gaseous helium. At this time, the liquid helium 2 is circulated in a 11 English Translation of PCT/CN2013/072397 closed cycle in the housing 5, thus no helium will be volatilized into the environment by the magnetic separation device during normal operation, thereby avoiding supplementary of the liquid helium periodically, and further reducing the operation cost. [0045] Further, in the double-cylinder superconducting magnetic separation device according 5 to the above-described embodiments, the superconducting magnet system further includes a dewar 3 for covering the housing 5. The dewar 3 provides a stable low temperature environment for the superconducting magnet 1 and maintains the magnet in the liquid helium temperature region, thus the magnetic may maintain the superconducting state, which ensures a stable operation. 10 [0046] Preferably, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, two ends of the superconducting magnet 1 are always connected to a positive pole and a negative pole of an external power via a current positive lead I and a current negative lead II, respectively. During the operation of the double-cylinder superconducting magnetic separation device, the superconducting magnet 1 is 15 connected to the external power via the current positive lead I and the current negative lead II, and the connection is always kept during the operation and there is no superconducting switch, thus, the operation current may be regulated to excite, demagnetize and change the intensity of the magnetic field according to the practical properties of the minerals, so as to obtain a matched intensity of the magnetic field, therefore an optimum separation effect may be realized, 20 and the operation may be more flexible and simple, and is easy to be controlled by the field personnel. Further, each of the current positive lead I and the current negative lead II is a high temperature superconducting binary current lead, thus two cooling steps are performed on the two leads in this embodiment, the first cooling step is performed by the refrigerating machine 4, and the second cooling step is performed by the liquid helium 2, thereby maintaining the two 25 leads under the superconducting temperature. [00471 Further, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, an end, away from the separation cavity, of each of the magnetic separation rollers 10 is connected to the bracket 9 via an organ pipe 12, and the organ 12 English Translation of PCT/CN2013/072397 pipe 12 is telescopic in the axial direction of the iron shield 11. Due to the organ pipe 12, the magnetic separation roller 10 may have an adequate extension quantity that it can move between the cleaning region and the separation region. [0048] The organ pipe is a pipe for suction and conveying, and is particularly suitable for 5 sucking solid, for example powder and fiber, and gaseous and liquid medium, and is often used for industrial dust-removing and suction device, air conditioner, and ventilation system. [0049] The properties of the organ pipe are described as follows. The organ pipe has a smooth interior, which may optimize the flow property, and the organ pipe is telescopic, has good alkali metal and acid resistance, good chemical resistance, good anti-ultraviolet property and ozone 10 resistance, and the organ pipe has a small bending radius, thus is not apt to be tangled up, and may avoid leakages of gas and liquid. [0050] In the double-cylinder superconducting magnetic separation device according to the above-described embodiments, the drive device 13 may be an electrical motor or a hydraulic cylinder, and may also be a gas cylinder or other drive mechanisms which can achieve the 15 reciprocating motion of the magnetic separation rollers 10. [0051] Preferably, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, the magnetic mediums include steel wool and/or steel screen, and may also employ pure iron for electrical grade and No. 10 steel as the magnetic mediums, or employ one or more of pure iron for electrical grade, No. 10 steel and 20 steel screen, and may also be a combined substance of the steel wool and steel screen. Other magnetic mediums may be selected according to the property and dimension of the magnetic particles to be captured. [0052] In order to further optimize the above-described embodiments, in the double-cylinder superconducting magnetic separation device according to the above-described embodiments, 25 the superconducting magnet 1 may be a solenoid superconducting magnet. The background magnetic field provided by the solenoid superconducting magnet has an intensity significantly higher than that of a conventional permanent magnet, or electromagnet, thus may provide a relatively high magnetic force, be able to process extremely small particles, thereby having a 13 English Translation of PCT/CN2013/072397 good separation effect. 100531 The above description is only preferable embodiments of the present application. It should be noted that, for the person skilled in the art, a few of modifications and improvements may be made to the present application without departing from the principle of the present 5 application, and these modifications and improvements are also deemed to fall into the scope of the present application. 14

Claims

1. A double-cylinder superconducting magnetic separation device for kaolin, comprising a superconducting magnet system, a separation system, and a feeding system; wherein, the superconducting magnet system comprises: 5 a superconducting magnet (1); liquid helium (2) for cooling the superconducting magnet (1); and an iron shield (11) for covering the superconducting magnet (1), wherein a separation cavity is arranged in the iron shield (11) in an axial direction of the iron shield (11); the separation system comprises: 10 a bracket (9); two magnetic separation rollers (10) which are both arranged on the bracket (9) and are located at two sides of the separation cavity, respectively, and are configured to alternately enter the separation cavity, and magnetic medium is arranged in each of the magnetic separation rollers (10); 15 a drive device (13) configured to drive the magnetic separation rollers (10) to move reciprocally; and a closed-loop magnetic circuit communicating device (14), which is arranged on each of the magnetic separation rollers (10) at an end close to the separation cavity; the feeding system comprises: 20 a feeding tank (7) for feeding slurry to be separated into the magnetic separation rollers (10); and a water injection tank (8) for injecting water into the magnetic separation rollers (10) for cleaning. 25

2. The double-cylinder superconducting magnetic separation device according to claim 1, wherein the superconducting magnet system further comprises a refrigerating machine (4) for 15 English Translation of PCT/CN2013/072397 cooling the superconducting magnet (1).

3. The double-cylinder superconducting magnetic separation device according to claim 2, wherein the superconducting magnet system further comprises a cooling shield (6) for covering 5 the superconducting magnet (1), and a cooling end of the refrigerating machine (4) is arranged in the cooling shield (6) by passing though the iron shield (11).

4. The double-cylinder superconducting magnetic separation device according to claim 3, wherein the superconducting magnet system further comprises a housing (5) for covering the 10 superconducting magnet (1), and the housing (5) is located in the cooling shield (6), and the liquid helium (2) and the cooling end of the refrigerating machine (4) are both arranged in the housing (5), and the liquid helium (2) is circulated in a closed cycle in the housing (5).

5. The double-cylinder superconducting magnetic separation device according to claim 4, 15 wherein the superconducting magnet system further comprises a dewar (3) for covering the housing (5).

6. The double-cylinder superconducting magnetic separation device according to claim 1, wherein two ends of the superconducting magnet (1) are always connected to a positive pole 20 and a negative pole of an external power via a current positive lead (I) and a current negative lead (II), respectively.

7. The double-cylinder superconducting magnetic separation device according to claim 1, wherein an end, away from the separation cavity, of each of the magnetic separation rollers (10) 25 is connected to the bracket (9) via an organ pipe (12), and the organ pipe (12) is telescopic in the axial direction of the iron shield (11).

8. The double-cylinder superconducting magnetic separation device according to claim 1, 16 English Translation of PCT/CN2013/072397 wherein the drive device (13) is an electrical motor or a hydraulic cylinder.

9. The double-cylinder superconducting magnetic separation device according to any one of claims 1 to 8, wherein the magnetic medium comprises steel wool and/or steel screen. 5

10. The double-cylinder superconducting magnetic separation device according to any one of claims 1 to 8, wherein the superconducting magnet (1) is a solenoid superconducting magnet. 17