Preparation method of high-purity quartz sand

Abstract

The invention relates to a preparation method of high-purity quartz sand, which is applied to the field of quartz sand preparation and comprises the following steps: during preparation of the high-purity quartz sand, performing targeted magnetic separation treatment on a quartz sand material which enters a magnetic separator and is subjected to water quenching and drying, performing normal magnetic attraction on quartz sand blocks, and performing normal magnetic attraction on powdery materials. The magnetic material conveying belt is moved into the powdery materials to be rubbed, so that the magnetic attraction sufficient degree of the magnetic materials in the powdery materials is enhanced, in addition, the problem that the thickness of the material conveying belt is not uniform is solved through a limiting piece structure, and through cooperative use of a limiting plate, a movable pocket plate and an intercepting plate, the magnetic attraction sufficient degree of the magnetic materials in the powdery materials is improved. The powdery materials are uniformly laid on the surface of the material conveying belt, so that the magnetic separation efficiency and the preparation efficiency and quality of the high-purity quartz sand are further improved.

Description

Technical Field

[0001] The invention relates to a method for preparing quartz sand, in particular to a method for preparing high-purity quartz sand applied in the field of quartz sand preparation. Background Art

[0002] High-purity quartz sand is generally prepared by quartz ore processing. High-purity quartz sand is a high-purity non-metallic mineral raw material with a particle size concentrated in 0.1-0.45mm produced by natural quartz minerals through a series of physical and chemical purification technologies. It is widely used in high-end electric light sources, large-scale and ultra-large-scale integrated circuits, solar cells, optical fibers, lasers, aerospace, military industry and other fields.

[0003] The specification of Chinese invention patent CN202310462297.2 discloses a device and method for preparing high-purity quartz sand from quartz stone. The invention is convenient for the transportation of quartz stone materials, has a high degree of automation, and does not affect the progress of each stage; through step-by-step crushing, the crushing effect is good, which is conducive to uniform calcination. When the filter plate is blocked, the dirt on the filter plate can be automatically scraped and removed, and the filtering work can be automatically restored.

[0004] In the existing quartz sand purification and preparation methods, magnetic separation is generally achieved by a magnetic separator. However, the magnetic separator generally uses a magnetic roller to adsorb magnetic substances to the surface of the conveyor belt when working. For example, Chinese patent CN202310942701.6 discloses a high-efficiency magnetic separator, which uses the depression and vibration of the conveyor belt to perform magnetic separation operations. However, during actual magnetic separation, the quartz sand in the depression is in a mixed state of block and powder, and the effect of the vibration and flipping of the quartz sand is limited, resulting in the magnetic substance in the lower layer of powdery substance being difficult to cross the upper layer of accumulated quartz sand and adsorb to the surface of the upward conveyor belt, resulting in poor magnetic separation effect. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a magnetic separation operation that performs different magnetic separation methods according to the particle size when magnetically separating quartz sand after water quenching, so as to improve the magnetic separation efficiency.

[0006] In order to solve the above problems, the present invention provides a method for preparing high-purity quartz sand, comprising the following working steps:

[0007] S1. Grind the quartz sand ore and perform rough washing after crushing to remove surface sludge;

[0008] S2, placing the ground quartz sand in S1 into a high-temperature calcining furnace for calcining;

[0009] S3, putting the quartz sand calcined in S2 into a low-temperature water pool for water quenching, and after the water quenching, fishing out the quartz sand and performing a drying operation;

[0010] S4, putting the dried quartz sand in S3 into a magnetic separator for graded contact magnetic separation;

[0011] S5, flotation treatment of the quartz sand after magnetic separation treatment in S4;

[0012] S6, taking out the quartz sand treated in S5, performing acid leaching treatment, and then washing with clean water;

[0013] S7, scoop out the quartz sand treated in S6, perform alkali leaching treatment, and then wash it with clean water;

[0014] S8, subjecting the quartz sand treated in S7 to high temperature chlorination treatment, washing it with clean water and then drying it;

[0015] The magnetic separator includes a horizontally placed material conveyor belt, a magnetic material conveyor belt arranged obliquely upward and a kneading frame located on one side of the magnetic material conveyor belt are installed above the material conveyor belt, a discharging frame is installed through the bottom of the kneading frame, and the two ends of the discharging frame are rotatably connected to the outer side with a screening frame located above the material conveyor belt;

[0016] A No. 1 magnetic roller and a conveying roller are installed on the inner side of the magnetic material conveyor belt, and the conveying roller is located above the No. 1 magnetic roller. A No. 2 magnetic roller is installed on the side of the No. 1 magnetic roller away from the kneading frame and is arranged horizontally and parallel to the No. 1 magnetic roller. The No. 1 magnetic roller, the No. 2 magnetic roller and the conveying roller are connected by a connecting plate.

[0017] A No. 2 frame is installed at the bottom of one side of the material conveyor belt, a vertical plate is installed on the surface of the No. 2 frame facing away from the material conveyor belt, a receiving plate is installed on the surface of the vertical plate, and a No. 1 frame located below the conveying roller is placed on the top of the receiving plate. A No. 1 electric extension rod is slidably installed on the surface of the vertical plate, a connecting plate is connected to the power end of the No. 1 electric extension rod, both ends of the connecting rod are fixedly connected to the No. 2 electric extension rod, and the power end of the No. 2 electric extension rod is connected to the connecting plate.

[0018] In the above-mentioned method for preparing high-purity quartz sand, the quartz sand material after water quenching and drying entering the magnetic separator is subjected to targeted magnetic separation treatment to enhance the degree of magnetic attraction of the magnetic material in the powdered material.

[0019] As a further improvement of the present application, two symmetrically arranged kneading pieces are installed inside the kneading frame, each kneading piece includes two winding rods, and a kneading plate is wound around the surface of the two winding rods. The kneading plate is made of stainless steel bars connected in series, and the two kneading pieces move in opposite directions when working.

[0020] As a further improvement of the present application, a plurality of equally spaced intercepting members are installed on the surface of the magnetic material conveyor belt, each intercepting member comprises two rubber plates of unequal heights connected to the surface of the magnetic material conveyor belt, an elastic member is installed between the two rubber plates, a movable plate is connected to the top of the elastic member, and the surface of the movable plate close to the magnetic material conveyor belt is coated with a magnetic coating that attracts the No. 1 magnetic roller.

[0021] As a further improvement of the present application, interception belts are arranged on both sides of the material conveyor belt and the magnetic material conveyor belt. The cross-sectional width of the magnetic material conveyor belt is smaller than the cross-sectional width of the material conveyor belt. The elasticity of the interception belts on both sides of the magnetic material conveyor belt is greater than the elasticity of the material conveyor belt.

[0022] As a further improvement of the present application, the minimum distance between frame No. 1 and the magnetic material conveyor belt in the vertical direction is greater than the movement distance of the No. 2 electric extension rod in the vertical direction, and the minimum horizontal distance between the magnetic material conveyor belt and the screening rack is greater than the movement distance of the No. 1 electric extension rod.

[0023] As a further improvement of the present application, a magnetic separation control system is installed inside the magnetic separator, and the magnetic separation control system includes a processor installed on the rubbing frame, and the processor is connected to a graded magnetic separation module and an execution drive module. The graded magnetic separation module includes a tilt sensor installed on the screening frame, which is used to detect the movement state of the screening frame. The execution drive module is connected to the signals of the No. 1 electric extension rod and the No. 2 electric extension rod, and is used to perform magnetic separation operations under different movement states of the screening frame.

[0024] As another improvement of the present application, a plurality of discharge pipes are installed through the bottom of the screening frame, and electromagnetic valves connected to the inclination sensor signals are installed on the surfaces of the discharge pipes.

[0025] As another improvement of the present application, the replacement structure of the discharge pipe is a limiter, each of which includes two limiter plates of the same length as the screening frame, wherein an axle rod is installed on the bottom wall of one of the limiter plates, and a movable pocket plate and an intercepting plate are installed on the surface of the axle rod, and the angle between the movable pocket plate and the intercepting plate is 90 degrees, and the cross-sectional width value of the movable pocket plate and the height value of the intercepting plate are both equal to the horizontal distance value between the two limiter plates.

[0026] As another improved supplement of the present application, a plurality of shafts are connected by a conveyor belt, a driving motor is installed inside the magnetic separator, and an output end of the driving motor is connected to an end of one of the shafts.

[0027] To summarize, when preparing high-purity quartz sand, the present application performs targeted magnetic separation treatment on the water-quenched and dried quartz sand material entering the magnetic separator. When the quartz sand blocks are in normal magnetic attraction, when dealing with powdered materials, the magnetic material conveyor belt is moved into the powdered material for friction to enhance the degree of magnetic attraction of the magnetic material in the powdered material. In addition, a limiting structure is used to solve the problem of uneven thickness of the material conveyor belt. Through the coordinated use of a limiting plate, a movable pocket plate and an intercepting plate, the powdered material on the surface of the material conveyor belt is evenly laid, thereby further improving the magnetic separation efficiency and the preparation efficiency and quality of high-purity quartz sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flowchart of this application;

[0029] Figure 2 This is a schematic diagram of the installation of a magnetic separator according to the first embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the installation of the discharge frame and the screening rack of the first embodiment of the present application;

[0031] Figure 4 This is a front view of the first embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the installation of the interception member of the first embodiment of the present application;

[0033] Figure 6 This is a diagram showing the changing state of the intercepting member of the first embodiment of the present application after leaving the No. 1 magnetic roller area;

[0034] Figure 7 This is a state diagram of the magnetic material conveyor belt when performing magnetic separation of powdered materials in the first embodiment of the present application;

[0035] Figure 8 This is a state diagram of the magnetic material conveyor belt when performing magnetic separation of quartz sand blocks in the first embodiment of the present application;

[0036] Fig. 9 This is a schematic diagram of the installation of the discharge pipe and the screening rack according to the first embodiment of the present application;

[0037] Fig.10 This is a schematic diagram of discharging powdered materials onto the surface of a material conveyor belt using a discharge pipe according to a second embodiment of the present application;

[0038] Fig.11 A diagram of a limiting plate and a screening frame according to a second embodiment of the present application;

[0039] Fig.12 A front view of a limiting member and a screening rack according to a second embodiment of the present application;

[0040] Fig.13 For this application Fig.12 A in the enlarged view;

[0041] Fig.14 This is a state diagram of the movable pocket plate unloading material in the second embodiment of the present application.

[0042] Description of the numbers in the figure:

[0043] 1. Material conveyor belt; 2. Magnetic material conveyor belt; 3. No. 1 magnetic roller; 4. Screening frame; 5. Kneading frame; 51. Kneading piece; 52. Discharging frame; 6. Intercepting piece; 61. Movable sheet; 62. Elastic piece; 63. Rubber sheet; 7. No. 1 electric stretching rod; 8. No. 2 electric stretching rod; 9. Conveying roller; 10. No. 1 frame; 11. No. 2 frame; 41. Discharging pipe; 12. No. 2 magnetic roller; 13. Limiting plate; 14. Movable pocket plate; 15. Intercepting plate. DETAILED DESCRIPTION

[0044] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0045] The first implementation method:

[0046] Figure 1 A method for preparing high-purity quartz sand is shown, comprising the following steps:

[0047] S1. Grind the quartz sand ore and perform rough washing after crushing to remove surface sludge;

[0048] S2, placing the ground quartz sand in S1 into a high-temperature calcining furnace for calcining;

[0049] S3, putting the quartz sand calcined in S2 into a low-temperature water pool for water quenching, and after the water quenching, fishing out the quartz sand and performing a drying operation;

[0050] S4, putting the dried quartz sand in S3 into a magnetic separator for graded contact magnetic separation;

[0051] S5, flotation treatment of the quartz sand after magnetic separation treatment in S4;

[0052] S6, taking out the quartz sand treated in S5, performing acid leaching treatment, and then washing with clean water;

[0053] S7, scoop out the quartz sand treated in S6, perform alkali leaching treatment, and then wash it with clean water;

[0054] S8, subjecting the quartz sand treated in S7 to high temperature chlorination treatment, washing it with clean water and then drying it;

[0055] Specifically, because cracks appear on the surface of the quartz sand block after water quenching, part of the material is separated from the surface of the quartz sand block in the form of powder, and then adheres to the cracks on the surface of the quartz sand block after drying. After being kneaded by the kneading frame in the magnetic separator, the powdered material (which may also include other small-sized materials) adhered to the cracks can be peeled off the surface of the quartz sand block again, and then the powdered material and the quartz sand block are transported separately on the material conveyor belt 1, so as to perform different magnetic separation operations to ensure the adequacy of the magnetic separation and the high purity of the quartz sand.

[0056] Figure 2-4 As shown, the magnetic separator includes a horizontally placed material conveyor belt 1, a magnetic material conveyor belt 2 arranged obliquely upward and a kneading frame 5 located on one side of the magnetic material conveyor belt 2 are installed above the material conveyor belt 1, a discharging frame 52 is installed through the bottom of the kneading frame 5, and the two ends of the discharging frame 52 are rotatably connected to the outer sides with a screening frame 4 located above the material conveyor belt 1;

[0057] A No. 1 magnetic roller 3 and a conveying roller 9 are installed on the inner side of the magnetic material conveying belt 2, and the conveying roller 9 is located above the side of the No. 1 magnetic roller 3. A No. 2 magnetic roller 12 arranged horizontally and parallel to the No. 1 magnetic roller 3 is installed on the side of the No. 1 magnetic roller 3 away from the kneading frame 5. The No. 1 magnetic roller 3, the No. 2 magnetic roller 12 and the conveying roller 9 are connected by a connecting plate.

[0058] A No. 2 frame 11 is installed below one side of the material conveyor belt 1, a vertical plate is installed on the surface of the No. 2 frame 11 facing away from the material conveyor belt 1, a receiving plate is installed on the surface of the vertical plate, a No. 1 frame 10 located below the conveying roller 9 is placed on the top of the receiving plate, a No. 1 electric extension rod 7 is slidably installed on the surface of the vertical plate, a connecting plate is connected to the power end of the No. 1 electric extension rod 7, a connecting plate is connected to both ends of the connecting rod, and a No. 2 electric extension rod 8 is fixedly connected, and the power end of the No. 2 electric extension rod 8 is connected to the connecting plate.

[0059] Specifically, after being kneaded by the kneading frame 5, the quartz sand material after water quenching and drying falls onto the surface of the screening frame 4. Through the interception of the screening frame 4, the powdered material can be transported to the position of the magnetic material conveyor belt 2 by the material conveyor belt 1 for magnetic separation.

[0060] When the powdered material is transported to the magnetic material conveyor belt 2, that is, the position of the No. 1 magnetic roller 3, the horizontally arranged No. 1 magnetic roller 3 and No. 2 magnetic roller 12 can maintain a long magnetic attraction time between the powdered material and the magnetic material conveyor belt 2. At the same time, the No. 2 electric extension rod 8 extends downward, so that the magnetic material conveyor belt 2 and the No. 1 magnetic roller 3 and No. 2 magnetic roller 12 and the conveying roller 9 inside are synchronously lowered until the part of the magnetic material conveyor belt 2 corresponding to the No. 1 magnetic roller 3 and the No. 2 magnetic roller 12 contacts the powdered material on the surface of the material conveyor belt 1. Then, the No. 1 electric extension rod 7 is started to drive the descending magnetic material conveyor belt 2 to move back and forth, which can frictionally contact the powdered material on the surface of the material conveyor belt 1, increase the contact area and duration with the magnetic material in the powdered material, and can fully magnetically attract the magnetic material in the powdered material to the magnetic material conveyor belt 2 area corresponding to the No. 1 magnetic roller 3 and the No. 2 magnetic roller 12 (such as Figure 7 shown);

[0061] After the magnetic material conveyor belt 2 that absorbs magnetic materials leaves the area where the No. 1 magnetic roller 3 and the No. 2 magnetic roller 12 are located, the intercepting member 6 loses its magnetic attraction and restraining effect due to the loss of its magnetic effect. The surface of the magnetic material conveyor belt 2 can be divided to prevent subsequent magnetic materials from falling during the upward transportation process.

[0062] Two symmetrically arranged kneading members 51 are installed inside the kneading frame 5. Each kneading member 51 includes two winding rods. A kneading plate is wound around the surface of the two winding rods. The kneading plate is made of stainless steel bars connected in series. The two kneading members 51 move in opposite directions when working.

[0063] Specifically, the kneading members 51 moving in opposite directions can knead the water-quenched and dried quartz sand material clamped therein, and can peel off the powdered materials and other small-sized materials adhered and consolidated in the cracks on the surface of the quartz sand block from the surface of the larger-sized quartz sand block.

[0064] Figure 5 It is shown that a plurality of equally spaced intercepting members 6 are installed on the surface of the magnetic material conveyor belt 2, each intercepting member 6 comprises two rubber sheets 63 of unequal heights connected to the surface of the magnetic material conveyor belt 2, an elastic member 62 is installed in the middle of the two rubber sheets 63, a movable sheet 61 is connected to the top of the elastic member 62, and the surface of the movable sheet 61 close to the magnetic material conveyor belt 2 is coated with a magnetic coating that attracts the No. 1 magnetic roller 3.

[0065] Specifically, when the intercepting member 6 is in the area of ​​the magnetic material conveying belt 2 corresponding to the first magnetic roller 3 and the second magnetic roller 12, it is magnetically attracted by the first magnetic roller 3 and the second magnetic roller 12, and the movable plate 61 is in a state of being adsorbed close to the surface of the magnetic material conveying belt 2. After that, after moving away from the area of ​​the magnetic material conveying belt 2 corresponding to the first magnetic roller 3 and the second magnetic roller 12, as the magnetic attraction constraint of the movable plate 61 weakens, the movable plate 61 is gradually lifted up under the action of the elastic member 62, and drives the rubber plate 63 to move upward, forming a baffle structure (such as Figure 6 As shown in the figure), the magnetic materials previously collected by magnetic absorption can be prevented from sliding down and falling down under the action of gravity.

[0066] In addition, a static magnetic shielding material is installed on the top of the movable plate 61 to prevent magnetic materials from adhering to the outer surface of the movable plate 61 .

[0067] Intercepting belts are arranged on both sides of the material conveyor belt 1 and the magnetic conveyor belt 2. The cross-sectional width of the magnetic conveyor belt 2 is smaller than that of the material conveyor belt 1. The elasticity of the intercepting belts on both sides of the magnetic conveyor belt 2 is greater than that of the material conveyor belt 1.

[0068] Specifically, the design of the intercepting belt can prevent the materials on the surface of the material conveyor belt 1 and the magnetic material conveyor belt 2 from separating from the surface of the conveyor belts, and because the elasticity of the intercepting belt on the surface of the magnetic material conveyor belt 2 is relatively weak, it is compressed when pressed down and abutted against the surface of the material conveyor belt 1 (a baffle that is in contact with the material conveyor belt 1 is installed on the inner side of the material conveyor belt 1, not shown, to ensure that the material conveyor belt 1 has sufficient supporting capacity when the magnetic material conveyor belt 2 is pressed down), thereby not affecting the contact magnetic suction operation of the magnetic material conveyor belt 2 and the powdered materials on the surface of the material conveyor belt 1.

[0069] The minimum vertical distance between the first frame 10 and the magnetic material conveyor belt 2 is greater than the vertical movement distance of the second electric extension rod 8 , and the minimum horizontal distance between the magnetic material conveyor belt 2 and the screening frame 4 is greater than the movement distance of the first electric extension rod 7 .

[0070] Specifically, the No. 1 electric extension rod 7 is horizontally displaced, and will not drive the magnetic material conveyor belt 32 to touch the screening frame 4 when moving. The No. 2 electric extension rod 8 is vertically displaced, so that the magnetic material conveyor belt 2 will not contact the No. 1 frame 10 when displaced, ensuring the normal collection of the No. 1 frame 10.

[0071] A magnetic separation control system is installed inside the magnetic separator, and the magnetic separation control system includes a processor installed on the kneading frame 5, and the processor is connected to a graded magnetic separation module and an execution drive module. The graded magnetic separation module includes an inclination sensor installed on the screening frame 4, which is used to detect the movement state of the screening frame 4. The execution drive module is connected to the signal of the No. 1 electric extension rod 7 and the No. 2 electric extension rod 8, and is used to perform magnetic separation operations under different movement states of the screening frame 4. A number of discharge pipes 41 are installed through the bottom of the screening frame 4, and a solenoid valve connected to the signal of the inclination sensor is installed on the surface of the discharge pipe 41.

[0072] Specifically, when the screening rack 4 is tilted, the quartz sand blocks intercepted in the screening rack 4 can be dumped onto the surface of the material conveyor belt 1. At this time, the solenoid valve is closed, and the powdered materials that have been screened and dropped are intercepted and retained inside the discharge pipe 41, and the powdered materials are suspended from being conveyed to the material conveyor belt 1. At this time, the magnetic separator performs magnetic separation of the quartz sand blocks. At this time, the No. 1 electric extension rod 7 and the No. 2 electric extension rod 8 are reset, so that the magnetic material conveyor belt 2 is located above the material conveyor belt 1, and the surface of the quartz sand blocks passing below can be magnetically separated (such as Figure 8 As shown), the screening rack 4 then returns to a horizontal state and the solenoid valve is opened at the same time.

[0073] The second implementation method:

[0074] Figure 10-13 The replacement structure of the discharge pipe 41 is shown to be a limiter, each of which includes two limiter plates 13 of the same length as the screening frame 4, wherein the bottom wall of one of the limiter plates 13 is installed with an axle rod, and the surface of the axle rod is installed with a movable pocket plate 14 and an intercepting plate 15, and the angle between the movable pocket plate 14 and the intercepting plate 15 is 90 degrees, and the cross-sectional width value of the movable pocket plate 14 and the height value of the intercepting plate 15 are both equal to the horizontal distance value between the two limiter plates 13.

[0075] A plurality of shafts are connected by a conveyor belt, a driving motor is installed inside the magnetic separator, and an output end of the driving motor is connected to the end of one of the shafts.

[0076] Different from the first embodiment, the present embodiment is directed to the first embodiment in which the powdered material in the screening rack 4 falls on the material conveyor belt 1 in a dot-shaped distribution (such as Fig. 9 As shown), the laying thickness of the powdered material on the material conveyor belt 1 is inconsistent, and when the magnetic conveyor belt 2 is subsequently pushed for magnetic attraction, the magnetic attraction is likely to be insufficient (because the movement degree of the magnetic conveyor belt 2 is uniform, in areas where the powdered material is thicker, the degree of descent may be insufficient, resulting in insufficient magnetic attraction). In this embodiment, the number of discharge holes at the bottom of the screening rack 4 contained in the two limiting plates 13 in each limiting member is not less than 1, and the number can be selected according to actual needs.

[0077] Specifically, in the present embodiment, the limit plate 13 is installed at the bottom of the screening frame 4, and the fallen powdered material is wrapped by the movable pocket plate 14. The shaft rotates, driving the intercepting plate 15 to switch from a vertical state to a horizontal state. At this time, the powdered material in the movable pocket plate 14 is scattered in a straight line on the surface of the material conveyor belt 1, so that the powdered material on the surface of the material conveyor belt 1 is evenly laid.

[0078] In summary, when preparing high-purity quartz sand, the present application performs targeted magnetic separation treatment on the water-quenched and dried quartz sand material entering the magnetic separator. When the quartz sand blocks are magnetically attracted, the magnetic material conveyor belt 2 is moved into the powdered material for friction to enhance the degree of magnetic attraction of the magnetic material in the powdered material. In addition, the limiter structure is used to solve the problem of uneven thickness of the material conveyor belt. The powdered material on the surface of the material conveyor belt is evenly laid through the use of the limit plate 13, the movable pocket plate 14 and the intercepting plate 15, thereby further improving the magnetic separation efficiency and the preparation efficiency and quality of high-purity quartz sand (such as Fig.14 shown).

[0079] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A method for preparing high-purity quartz sand, It is characterized in that The following steps are included: S1. Grind the quartz sand ore and perform rough washing after crushing to remove surface sludge; S2, placing the ground quartz sand in S1 into a high-temperature calcining furnace for calcining; S3, putting the quartz sand calcined in S2 into a low-temperature water pool for water quenching, and after the water quenching, fishing out the quartz sand and performing a drying operation; S4, putting the dried quartz sand in S3 into a magnetic separator for graded contact magnetic separation; S5, flotation treatment of the quartz sand after magnetic separation treatment in S4; S6, taking out the quartz sand treated in S5, performing acid leaching treatment, and then washing with clean water; S7, scoop out the quartz sand treated in S6, perform alkali leaching treatment, and then wash it with clean water; S8, subjecting the quartz sand treated in S7 to high temperature chlorination treatment, washing with clean water and then drying; The magnetic separator comprises a horizontally placed material conveyor belt (1), a magnetic material conveyor belt (2) arranged obliquely upward and a kneading frame (5) located on one side of the magnetic material conveyor belt (2) are installed above the material conveyor belt (1), a discharging frame (52) is installed through the bottom of the kneading frame (5), and the outer sides of both ends of the discharging frame (52) are rotatably connected to the screening frame (4) located above the material conveyor belt (1); A first magnetic roller (3) and a conveying roller (9) are installed on the inner side of the magnetic material conveying belt (2), and the conveying roller (9) is located on the upper side of the first magnetic roller (3). A second magnetic roller (12) arranged horizontally and parallel to the first magnetic roller (3) is installed on the side of the first magnetic roller (3) away from the kneading frame (5). The first magnetic roller (3), the second magnetic roller (12) and the conveying roller (9) are connected by a connecting plate. A second frame (11) is installed below one side of the material conveyor belt (1), a vertical plate is installed on the surface of the second frame (11) facing away from the material conveyor belt (1), a receiving plate is installed on the surface of the vertical plate, a first frame (10) located below the conveying roller (9) is placed on the top of the receiving plate, a first electric extension rod (7) is slidably installed on the surface of the vertical plate, a power end of the first electric extension rod (7) is connected to a connecting plate, both ends of the connecting rod are fixedly connected to a second electric extension rod (8), and the power end of the second electric extension rod (8) is connected to the connecting plate.

2. A method for preparing high-purity quartz sand according to claim 1, Features: Two symmetrically arranged kneading members (51) are installed inside the kneading frame (5), each of the kneading members (51) comprises two winding rods, and the surfaces of the two winding rods are wound with kneading plates, and the kneading plates are made of stainless steel bars connected in series. The two kneading members (51) move in opposite directions when working.

3. A method for preparing high-purity quartz sand according to claim 1, Features: The surface of the magnetic material conveyor belt (2) is installed with a plurality of equally spaced intercepting members (6), each of the intercepting members (6) comprising two rubber sheets (63) of unequal heights connected to the surface of the magnetic material conveyor belt (2), an elastic member (62) is installed between the two rubber sheets (63), the top of the elastic member (62) is connected to a movable sheet (61), and the surface of the movable sheet (61) close to the magnetic material conveyor belt (2) is coated with a magnetic coating that attracts the first magnetic roller (3).

4. A method for preparing high-purity quartz sand according to claim 1, Features: Intercepting belts are arranged on both sides of the material conveying belt (1) and the magnetic material conveying belt (2); the cross-sectional width of the magnetic material conveying belt (2) is smaller than the cross-sectional width of the material conveying belt (1); and the elasticity of the intercepting belts on both sides of the magnetic material conveying belt (2) is greater than the elasticity of the material conveying belt (1).

5. A method for preparing high-purity quartz sand according to claim 1, Features: The minimum distance between the first frame (10) and the magnetic material conveyor belt (2) in the vertical direction is greater than the moving distance of the second electric extension rod (8) in the vertical direction, and the minimum horizontal distance between the magnetic material conveyor belt (2) and the screening rack (4) is greater than the moving distance of the first electric extension rod (7).

6. A method for preparing high-purity quartz sand according to claim 1, Features: A magnetic separation control system is installed inside the magnetic separator, and the magnetic separation control system includes a processor installed on the kneading frame (5), and the processor is connected to a graded magnetic separation module and an execution drive module. The graded magnetic separation module includes an inclination sensor installed on the screening frame (4) for detecting the movement state of the screening frame (4), and the execution drive module is connected to the first electric extension rod (7) and the second electric extension rod (8) by signal, and is used to execute magnetic separation operations under different movement states of the screening frame (4).

7. A method for preparing high-purity quartz sand according to claim 6, Features: A plurality of discharge pipes (41) are installed through the bottom of the screening frame (4), and a solenoid valve connected to the tilt sensor signal is installed on the surface of the discharge pipe (41).

8. A method for preparing high-purity quartz sand according to claim 7, Features: The replacement structure of the discharge pipe (41) is a limiting member, each of which includes two limiting plates (13) of the same length as the screening frame (4), wherein a shaft is installed on the bottom wall of one of the limiting plates (13), and a movable pocket plate (14) and an intercepting plate (15) are installed on the surface of the shaft, and the angle between the movable pocket plate (14) and the intercepting plate (15) is 90 degrees, and the cross-sectional width value of the movable pocket plate (14) and the height value of the intercepting plate (15) are both equal to the horizontal distance value between the two limiting plates (13).

9. A method for preparing high-purity quartz sand according to claim 8, Features: The plurality of shafts are connected by a conveyor belt, a driving motor is installed inside the magnetic separator, and an output end of the driving motor is connected to the end of one of the shafts.

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