Method for purifying feldspar concentrate through superconducting strong magnetic separation

Abstract

The invention discloses a method for purifying feldspar concentrate through superconducting high-intensity magnetic separation, which belongs to the technical field of purification of high-quality industrial raw materials and comprises the following steps of crushing, ore grinding, desliming, high-intensity magnetic roughing, high-intensity magnetic concentration, grading, fine particle high-intensity magnetic concentration and solid-liquid separation and dehydration. Aiming at the differences of hardness, granularity, dissociation degree, specific susceptibility and the like between the feldspar ore and associated minerals contained in the feldspar ore, a reasonable physical mineral separation process is selected, and the raw ore is selected into three products, namely a building raw material which can be used as raw materials of cement, aerated bricks and the like, and a medium-grain feldspar concentrate and a fine-grain feldspar concentrate which can be used as raw materials of photovoltaic glass; in addition, all the processes are environment-friendly physical ore dressing, no pollution is generated, a flotation process is not needed, zero emission of tailings and tail water is achieved, and the method is suitable for large-scale production and application.

Description

Technical Field

[0001] The present invention relates to the technical field of high-quality industrial raw material purification, and specifically relates to a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation. Background Art

[0002] Feldspar is the most important rock-forming mineral in surface rocks and is a silicate mineral containing alkaline earth metals such as potassium, sodium, calcium, and barium. The main types of feldspar include potassium feldspar, sodium feldspar, calcium feldspar, barium feldspar, orthoclase, plagioclase, sanidine, hyalophane, etc. They all have a vitreous luster, and their colors are divided into colorless, white, yellow, pink, green, gray, black, etc. Pure feldspar ore is colorless and transparent and is in the shape of plates, columns, or needles, but it shows different colors after containing coloring impurities such as iron oxide, titanium, and manganese.

[0003] Feldspar minerals are the most widely distributed in the earth's crust, accounting for about 50% of the total weight of the earth's crust, and they appear in igneous rocks, metamorphic rocks, and sedimentary rocks. Feldspar is mainly applied to the glass industry (about 50 - 60%) and the ceramic industry (about 30%). Other application fields include chemical industry, abrasives, glass fiber, welding electrodes, enamel and fillers, rubber, coatings, building materials, etc., which are closely related to human life and production. Feldspar raw ore produced in nature contains a certain amount of impurities to varying degrees. According to different industrial uses, the quality standards required for feldspar raw materials are different. Generally, large-scale mined feldspar ore needs to go through a series of processing before it can be used.

[0004] According to the different properties and associated minerals of feldspar ore, single or combined beneficiation processes such as crushing, grinding, screening, weak magnetic separation, high-intensity magnetic separation, optical separation, flotation, electrostatic separation, and chemical separation are often used for processing and purification. In these processes, conventional beneficiation processes can only produce medium-quality feldspar concentrate products, while high-quality industrial products require complex combined beneficiation processes, which will cause negative impacts such as a large increase in production costs, a decrease in the finished product rate, a long process flow, a large equipment investment, a small production scale, an increase in management difficulty, and serious environmental pollution, severely restricting the healthy development of enterprises and the market demand in high-end application fields.

[0005] Therefore, it is an urgent problem to be solved at present to develop and design a beneficiation process that uses pure physics, is green and environmentally friendly, and pollution-free, can produce high-quality feldspar products that meet the requirements of raw materials used in high-end fields such as photovoltaic glass, and realizes zero discharge of tailings and tail water, that is, a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation. Summary of the Invention

[0006] Regarding the problems existing in the prior art, the present invention provides a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation, which selects a reasonable combined beneficiation process flow including crushing, grinding, desliming, high-intensity magnetic roughing, high-intensity magnetic cleaning, classification, fine-grained high-intensity magnetic cleaning, solid-liquid separation and dehydration, etc., and separates the original ore into three products: building materials raw materials that can be used as raw materials for cement, aerated bricks, etc., medium-grained feldspar concentrate and fine-grained feldspar concentrate that can be used as raw materials for photovoltaic glass. The comprehensive utilization rate is 100%. Moreover, all processes are green and environmentally friendly physical beneficiation processes, without generating any pollution, without the need to use flotation processes, achieving zero discharge of tailings and tail water, and being suitable for large-scale production applications.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The present invention provides a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation, including the following steps: S1: Crushing: Perform a crushing operation on the original ore to obtain fine-grained ore; S2: Grinding: Pulp the fine-grained ore and then perform a grinding operation to obtain low-grade feldspar powder; S3: Desliming: Pulp the low-grade feldspar powder and then perform a desliming operation to obtain high-grade feldspar powder and fine mud, and discharge the fine mud into the tailings sedimentation tank; S4: High-intensity magnetic roughing: Perform a magnetic separation operation on the high-grade feldspar powder at the first magnetic field intensity to obtain the first magnetic substance and the first non-magnetic substance, and discharge the first magnetic substance into the tailings sedimentation tank; S5: High-intensity magnetic cleaning: Perform a magnetic separation operation on the first non-magnetic substance at the second magnetic field intensity to obtain the second magnetic substance and the second non-magnetic substance, and discharge the second magnetic substance into the tailings sedimentation tank; the second magnetic field intensity is greater than the first magnetic field intensity; S6: Classification: Perform a classification operation on the second non-magnetic substance to obtain medium-grained products and fine-grained products, and discharge the medium-grained products into the first concentrate sedimentation tank; S7: Fine-grained high-intensity magnetic cleaning: Perform a magnetic separation operation on the fine-grained products at the third magnetic field intensity to obtain the third magnetic substance and the third non-magnetic substance, discharge the third non-magnetic substance into the second concentrate sedimentation tank, and discharge the third magnetic substance into the tailings sedimentation tank; the third magnetic field intensity is greater than the second magnetic field intensity; S8: Solid-liquid separation and dehydration: Perform solid-liquid separation operations on the products in the tailings sedimentation tank, the first concentrate sedimentation tank and the second concentrate sedimentation tank respectively. The separated solids are building materials raw materials, medium-grained feldspar concentrate and fine-grained feldspar concentrate respectively, and the separated liquid can be recycled.

[0008] As a preferred technical solution, in step S1, the crushing operation includes a primary crushing operation and a secondary crushing operation performed in sequence, and the original ore is subjected to the primary crushing operation using a jaw crusher and the secondary crushing operation using a hammer crusher.

[0009] As a preferred technical solution, in step S2, the fine-grained ore is subjected to grinding operation using a ceramic ball mill.

[0010] As a preferred technical solution, in step S3, the low-grade feldspar powder is subjected to de-sludging operation using a de-sludging hopper.

[0011] As a preferred technical solution, in step S4, the first magnetic field intensity is set to 1.4 - 1.6 Tesla, and magnetic separation operation is carried out using an electromagnetic slurry high-gradient magnetic separator, and the magnetic separation medium used is a 4×8mm rhombic high-permeability stainless steel wire mesh.

[0012] As a preferred technical solution, in step S5, the second magnetic field intensity is set to 4.0 - 4.5 Tesla, and magnetic separation operation is carried out using a cryogenic superconducting magnetic separator, and the magnetic separation medium used is a 3×6mm rhombic high-permeability stainless steel wire mesh.

[0013] As a preferred technical solution, in step S6, the second magnetic substance is subjected to classification operation using a hydrocyclone.

[0014] As a preferred technical solution, in step S7, the third magnetic field intensity is set to 4.5 - 5.0 Tesla, and magnetic separation operation is carried out using a cryogenic superconducting magnetic separator, and the magnetic separation medium used is a 2×4mm rhombic high-permeability stainless steel wire mesh.

[0015] As a preferred technical solution, in step S8, the product in the tailing sedimentation tank enters a plate and frame filter press for solid-liquid separation and dehydration operation after sedimentation and concentration; the products in the first concentrate sedimentation tank and the second concentrate sedimentation tank enter a ceramic filter press for solid-liquid separation and dehydration operation respectively after sedimentation.

[0016] As a preferred technical solution, in step S8, the particle size of the medium-grained feldspar concentrate is +38 , and the whiteness of the medium-grained feldspar concentrate is not less than 84; the particle size of the fine-grained feldspar concentrate is -38 , and the whiteness of the fine-grained feldspar concentrate is not less than 81.

[0017] The beneficial effects of the present invention are as follows: 1. The present invention selects a combined beneficiation process flow including reasonable crushing, grinding, desliming, strong magnetic roughing, strong magnetic cleaning, classification, fine-grained strong magnetic cleaning, solid-liquid separation and dehydration, etc. The original ore is separated into three products: building materials raw materials that can be used as raw materials for cement, aerated bricks, etc., medium-grained feldspar concentrate and fine-grained feldspar concentrate that can be used as raw materials for photovoltaic glass. The comprehensive utilization rate is 100%. Moreover, all processes are green and environmentally friendly physical beneficiation processes, without generating any pollution, without the need to use flotation processes, achieving zero discharge of tailings and tail water, and being suitable for large-scale production applications.

[0018] 2. In view of the differences in hardness, particle size, degree of dissociation, specific magnetic susceptibility, etc. between the feldspar ore and the associated minerals contained therein, under the condition of crushing and grinding to a suitable monomer dissociation fineness, a desliming hopper with high working efficiency and low production cost is used for desliming operation, and fine mud impurities such as calcium oxide, magnesium, iron, titanium, etc. with low hardness and easy to slime can be removed in advance; an electromagnetic slurry high-gradient magnetic separator is used for strong magnetic roughing operation, and impurity minerals such as iron oxide and titanium with relatively high specific magnetic susceptibility coefficients can be effectively pre-selected, reducing the pressure of subsequent strong magnetic separation; a low-temperature superconducting magnetic separator is used for strong magnetic cleaning operation, and impurity minerals such as iron oxide and titanium oxide with relatively low specific magnetic susceptibility coefficients can be strongly selected, producing high-quality feldspar concentrate products; a hydrocyclone is used for classification operation, and +38 medium-grained high-quality feldspar concentrate products can be directly separated; under optimized conditions such as high magnetic field strength and narrow medium, a low-temperature superconducting magnetic separator can deeply and strongly remove iron oxide, titanium oxide, etc. with relatively low specific magnetic susceptibility coefficients in the -38 fine-grained fraction, and -38 fine-grained high-quality feldspar concentrate products can be obtained, greatly improving the added value of the products.

[0019] 3. Processes such as crushing, grinding, desliming and strong magnetic roughing in the present invention are all pre-assist processes for superconducting strong magnetic purification operation, which can greatly improve the quality of feldspar; after the classification operation, the fine-grained products are further subjected to strong magnetic cleaning operation, and high-quality fine-grained feldspar concentrate products can be produced; jaw crushers, hammer crushers, ball mills, desliming hoppers, electromagnetic slurry magnetic separators, hydrocyclones, superconducting magnetic separators, etc. are all mature industrial mechanical equipment; the filter press water generated by the solid-liquid separation operation can be returned to each operation section for recycling after precipitation and clarification, achieving zero discharge of tail water; the mixture of fine mud and magnetic substances produced by the desliming operation and the three-stage magnetic separation operation has physical properties and chemical properties that meet the standards of building materials raw materials such as cement and aerated bricks, and zero discharge of tailings can be achieved.

[0020] 4. Through the desliming process, the present invention can remove in advance the non-magnetic, fine-grained gangue impurity minerals such as calcium, magnesium, aluminum, etc. doped in the feldspar powder, improving the quality of feldspar while reducing the magnetic separation pressure.

[0021] 5. Since there are a small amount of medium-magnetic iron oxide minerals in the original ore, this part of the iron oxide minerals directly enter the high-intensity superconducting magnetic separator, which is likely to cause clogging of the magnetic medium, resulting in serious entrainment phenomenon and affecting the beneficiation effect. The magnetic field intensity of each stage of magnetic separation in the present invention gradually increases, and the medium pore diameter gradually decreases, so that this part of the iron oxide minerals can be removed in advance at the electromagnetic pulp magnetic separator with relatively low magnetic field intensity, reducing the pressure of subsequent superconducting magnetic separation and enabling the superconducting magnetic separator to play a better role. At the same time, the existing beneficiation process system that combines a conventional vertical ring high-gradient magnetic separator and an electromagnetic pulp high-gradient magnetic separator is limited by technical parameters such as the magnetic field intensity and separation accuracy of the equipment. Even if the magnetic separation effect is enhanced through a multi-stage series separation process, the whiteness index of the obtained concentrate product is still difficult to break through the technical bottleneck of 80%. The superconducting magnetic separator has a higher magnetic field intensity, which can strongly separate weakly magnetic iron-titanium impurity minerals, and thus can greatly improve the quality of the concentrate.

[0022] 6. The present invention divides the concentrate product into medium-grained and fine-grained grades through a classification process. Since the fine-grained concentrate product contains a small amount of iron-titanium and other impurity minerals with weak magnetism or extremely weak magnetism, due to the relatively fine particle size and low specific magnetization susceptibility of these impurity minerals, superconducting high-intensity magnetic separation is carried out under optimized conditions such as a finer-mesh pore medium and a higher magnetic field intensity, so as to separate a higher-quality fine-grained concentrate product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Process flow chart of an embodiment of a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to the present invention. DETAILED DESCRIPTION

[0024] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0025] A feldspar beneficiation plant in Jiangxi previously used a conventional "crushing - grinding - vertical ring high-intensity magnetic separation - reverse flotation" process for the processing of feldspar concentrate. The contents of various elements in the obtained concentrate product were: SiO2 67 - 68%, K2O + Na2O 13 - 14%, Al2O3 17 - 18%, Fe2O3 0.05 - 0.06%, TiO2 0.02 - 0.03%, and the whiteness was 74 - 76%. This concentrate product could reach the quality standard of high-quality products for medium and high-end ceramics and glass. In order to meet the demand for high-quality feldspar products in high-end fields such as photovoltaic glass and increase the added value of the products, the enterprise adopted an enhanced flotation process and improved conditions such as grinding fineness, but still could not produce high-quality feldspar concentrate products required for the photovoltaic glass field with Fe2O3 < 0.02%, TiO2 < 0.01%, and whiteness > 80%, which restricted the healthy development of the enterprise and affected the production efficiency of the enterprise at the same time.

[0026] For the technical and technological problems existing in enterprise production, in addition to ensuring that medium- and high-end feldspar concentrate products with whiteness > 75% can be obtained by conventional process production, high-quality feldspar concentrate products required for the photovoltaic glass field with whiteness > 80% can also be produced. Please refer to Figure 1 and Table 1. The following is a specific implementation case of a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation provided by the present invention adopted by this feldspar concentrator, including the following steps: S1: Crushing: The massive raw ore with a particle size of -200 mm enters the jaw crusher for coarse crushing operation, and the ore with a particle size of -30 mm obtained enters the hammer crusher for fine crushing operation to obtain fine-grained ore with a particle size of -5 mm, which can reduce the production cost and efficiency of the next grinding operation.

[0027] S2: Grinding: The fine-grained ore with a particle size of -5 mm is prepared into a pulp concentration of 67% and enters the ceramic ball mill for grinding operation to achieve monomer dissociation between feldspar and other minerals. The grinding medium used is high-aluminum spheres to avoid the generation of mechanical iron; low-grade feldspar powder with a fineness of -100 mesh is obtained.

[0028] S3: Desliming: The low-grade feldspar powder with a fineness of -100 mesh is prepared into a pulp concentration of 30% and enters the desliming hopper for desliming operation to obtain high-grade feldspar powder and fine mud. Among them, the fine mud is calcium oxide, magnesium, iron and other dyeing impurities with a fineness of -5 mesh, low hardness and easy to slime. The fine mud is discharged into the tailings sedimentation tank, and the high-grade feldspar powder after desliming the fine mud can significantly improve the quality of feldspar.

[0029] S4: High-intensity magnetic roughing: The high-grade feldspar powder enters the electromagnetic slurry high-gradient magnetic separator for the first-stage high-intensity magnetic roughing operation. The magnetic field intensity of the electromagnetic slurry high-gradient magnetic separator is 1.4 - 1.6 Tesla, and the medium is a 4×8 mm diamond-shaped high-permeability stainless steel wire mesh. Under these parameters, impurity minerals with relatively high specific magnetic susceptibility coefficients such as iron oxide and titanium oxide (the first magnetic substances) can be effectively selected, reducing the selection pressure of the superconducting magnetic separator with a higher magnetic field strength in the next step; high-quality feldspar concentrate (the first non-magnetic substance) with Fe2O3 content of 0.05 - 0.06%, TiO2 content of 0.025 - 0.030%, and whiteness of 74 - 76% is obtained. This index is similar to the production index of the previous conventional "magnetic separation + flotation".

[0030] S5: High-intensity magnetic cleaning: The first non-magnetic material is fed into a low-temperature superconducting magnetic separator for the second-stage strong magnetic beneficiation operation. The magnetic field intensity of the superconducting magnetic separator is 4.0 - 4.5 Tesla, and the medium is a 3×6 mm diamond-shaped high-permeability stainless steel wire mesh. Under these parameters, impurities such as iron oxide and titanium with relatively low specific magnetization susceptibility coefficients (the second magnetic materials) can be strongly removed, significantly improving the quality of feldspar concentrate. High-quality feldspar concentrate (the second non-magnetic material) with an Fe2O3 content of 0.024 - 0.026%, a TiO2 content of 0.012 - 0.014%, and a whiteness of 79 - 80% can be obtained.

[0031] S6: Classification: The second non-magnetic material is fed into a hydrocyclone for classification operation to separate out medium-grain products with a size of +38 and fine-grain products with a size of -38 ; among them, the Fe2O3 content of the medium-grain products with a size of +38 is 0.014 - 0.016%, the TiO2 content is 0.007 - 0.008%, and the whiteness is 83.50 - 84.50%, meeting the quality standard of high-quality feldspar raw materials used in the high-end application field of photovoltaic glass; the Fe2O3 content of the fine-grain products with a size of -0.38 mm is 0.026 - 0.030%, the TiO2 content is 0.016 - 0.018%, and the whiteness is 76 - 78%. There are still a small amount of fine-grained iron oxide, titanium and other impurities occurring as inclusions or in fine-grained states.

[0032] S7: Fine-grain strong magnetic beneficiation: The fine-grain products are fed into a low-temperature superconducting magnetic separator for the third-stage strong magnetic beneficiation operation. The magnetic field intensity of the superconducting magnetic separator is 4.5 - 5.0 Tesla, and the medium is a 2×4 mm diamond-shaped high-permeability stainless steel wire mesh. Under these parameters, impurities such as iron oxide and titanium with relatively low specific magnetization susceptibility coefficients and finer particles (the third magnetic materials) can be deeply and strongly separated out to obtain fine-grain feldspar concentrate (the third non-magnetic material) with an Fe2O3 content of 0.018 - 0.019%, a TiO2 content of 0.008 - 0.010%, and a whiteness of 81 - 82%, which can meet the quality standard of high-quality feldspar raw materials used in the high-end application field of photovoltaic glass.

[0033] S8: Solid-liquid separation and dehydration: The product in the tailings sedimentation tank is concentrated by sedimentation and then enters a plate and frame filter press for solid-liquid separation and dehydration operations, obtaining building materials raw materials for making cement and aerated bricks. The product in the first concentrate sedimentation tank is sedimented and then enters a ceramic filter press for solid-liquid separation operations, obtaining medium-grained feldspar concentrate with Fe2O3 content of 0.015%, TiO2 content of 0.007%, and whiteness of 84.26%. The product in the second concentrate sedimentation tank is sedimented and then enters a ceramic filter press for solid-liquid separation operations, obtaining fine-grained feldspar concentrate with Fe2O3 content of 0.019%, TiO2 content of 0.009%, and whiteness of 81.65%. The filter press water generated by solid-liquid separation can be returned to each operation section for recycling. The specific beneficiation indexes are shown in Table 1.

[0034] Table 1 Beneficiation indexes of superconducting high-intensity magnetic separation for purifying feldspar concentrate %

[0035] In other embodiments, the medium-grained product obtained in the classification operation of step S6 and the non-magnetic third substance obtained in the fine-grained high-intensity magnetic separation operation of step S7 can also be mixed, and then after sedimentation, enter a ceramic filter press for solid-liquid separation and dehydration operations, obtaining high-quality feldspar concentrate with fineness of -100 , Fe2O3 content of 0.016 - 0.018%, TiO2 content of 0.007 - 0.009%, and whiteness of 82 - 83%.

[0036] It should be noted that in the beneficiation process of this embodiment, physical beneficiation processes that are green and environmentally friendly are adopted in each operation section such as crushing, grinding, desliming, high-intensity magnetic roughing, high-intensity magnetic separation, classification, fine-grained high-intensity magnetic separation, and solid-liquid separation and dehydration. The tail water produced by all products after solid-liquid separation operations can be clarified and returned to each operation section for recycling. The equipment such as jaw crushers, hammer crushers, ceramic ball mills, desliming hoppers, electromagnetic pulp high-gradient magnetic separators, low-temperature superconducting magnetic separators, hydrocyclones, ceramic filter presses, and plate and frame filter presses used in the beneficiation process of this embodiment are all mature industrial common equipment and can be applied to large-scale production.

[0037] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation, characterized in that, It includes the following steps: S1： Crushing: Conduct crushing operation on the original ore to obtain fine-grained ore; S2: Grinding: Pulp the fine-grained ore and then conduct grinding operation to obtain low-grade feldspar powder; S3: Dewatering of mud: Pulp the low-grade feldspar powder and then conduct dewatering of mud operation to obtain high-grade feldspar powder and fine mud, and discharge the fine mud into the tailings sedimentation tank; S4: Strong magnetic rough separation: Conduct magnetic separation operation on the high-grade feldspar powder under the first magnetic field intensity to obtain the first magnetic substance and the first non-magnetic substance, and discharge the first magnetic substance into the tailings sedimentation tank; S5: Strong magnetic fine separation: Conduct magnetic separation operation on the first non-magnetic substance under the second magnetic field intensity to obtain the second magnetic substance and the second non-magnetic substance, and discharge the second magnetic substance into the tailings sedimentation tank; the second magnetic field intensity is greater than the first magnetic field intensity; S6: Classification: Conduct classification operation on the second non-magnetic substance to obtain medium-grained products and fine-grained products, and discharge the medium-grained products into the first concentrate sedimentation tank; S7: Fine-grained strong magnetic fine separation: Conduct magnetic separation operation on the fine-grained products under the third magnetic field intensity to obtain the third magnetic substance and the third non-magnetic substance, discharge the third non-magnetic substance into the second concentrate sedimentation tank, and discharge the third magnetic substance into the tailings sedimentation tank; The third magnetic field intensity is greater than the second magnetic field intensity; S8: Solid-liquid separation and dehydration: Conduct solid-liquid separation operations on the products in the tailings sedimentation tank, the first concentrate sedimentation tank, and the second concentrate sedimentation tank respectively. The separated solids are building material raw materials, medium-grained feldspar concentrate, and fine-grained feldspar concentrate respectively, and the separated liquid can be recycled.

2. The method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S1, the crushing operation includes coarse crushing operation and fine crushing operation carried out in sequence. The original ore is subjected to coarse crushing operation using a jaw crusher and fine crushing operation using a hammer crusher in sequence.

3. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S2, the fine-grained ore is subjected to grinding operation using a ceramic ball mill.

4. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S3, the low-grade feldspar powder is subjected to dewatering of mud operation using a dewatering hopper.

5. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S4, the first magnetic field intensity is set to 1.4 - 1.6 Tesla, and magnetic separation operation is carried out using an electromagnetic slurry high-gradient magnetic separator. The magnetic separation medium used is a 4×8mm diamond-shaped high-permeability stainless steel wire mesh.

6. The method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, wherein, In step S5, the second magnetic field intensity is set to 4.0 - 4.5 Tesla, and magnetic separation operation is carried out using a cryogenic superconducting magnetic separator. The magnetic separation medium used is a 3×6mm diamond-shaped high-permeability stainless steel wire mesh.

7. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S6, the second magnetic substance is subjected to classification operation using a hydrocyclone.

8. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S7, the third magnetic field intensity is set to 4.5 - 5.0 Tesla, and magnetic separation operation is carried out using a cryogenic superconducting magnetic separator. The magnetic separation medium used is a 2×4mm diamond-shaped high-permeability stainless steel wire mesh.

9. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that In step S8, the product in the tailings sedimentation tank enters a plate and frame filter press for solid-liquid separation and dehydration operation after sedimentation and concentration; the products in the first concentrate sedimentation tank and the second concentrate sedimentation tank enter a ceramic filter for solid-liquid separation and dehydration operation respectively after sedimentation.

10. A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation according to claim 1, characterized in that, In step S8, the particle size of the medium-grained feldspar concentrate is +38 , and the whiteness of the medium-grained feldspar concentrate is not less than 84; the particle size of the fine-grained feldspar concentrate is -38 , and the whiteness of the fine-grained feldspar concentrate is not less than 81.

Images