A method for purifying feldspar concentrate by superconducting high-intensity magnetic separation

Abstract

The application discloses a method for purifying feldspar concentrate by superconducting high-intensity magnetic separation, and belongs to the technical field of high-quality industrial raw material purification, and comprises the following steps: crushing, grinding, desliming, high-intensity rough magnetic separation, high-intensity magnetic separation, grading, fine-particle high-intensity magnetic separation, solid-liquid separation and dehydration; according to the differences between feldspar ore and associated minerals in hardness, granularity, dissociation degree and specific magnetic susceptibility, reasonable physical beneficiation processes are selected, and the raw ore is selected into three products, i.e., building material raw materials which can be used as cement and aerated brick raw materials, and medium-granularity feldspar concentrate and fine-granularity feldspar concentrate which can be used as photovoltaic glass raw materials, so that the comprehensive utilization rate is 100%, all the processes are green and environmentally-friendly physical beneficiation processes, no pollution is generated, no flotation process is needed, tailing and tail water zero discharge is realized, and the method is suitable for large-scale production and application.

Description

Technical Field

[0001] The present invention relates to the technical field of purification of high-quality industrial raw materials, and in particular to a method for purifying feldspar concentrate through superconducting strong magnetic separation. Background Art

[0002] Feldspar is the most important rock-forming mineral in surface rocks. It 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, sansholm, and barium cryolite. They all have a glassy luster and are available in colors such as colorless, white, yellow, pink, green, gray, and black. Pure feldspar ore is colorless and transparent and is plate-shaped, columnar, or needle-shaped, but it exhibits different colors after containing dyeing impurities such as iron oxide, titanium, and manganese.

[0003] Feldspar minerals are the most widely distributed in the Earth's crust, accounting for approximately 50% of the total weight of the Earth's crust. They occur in igneous rocks, metamorphic rocks, and sedimentary rocks. Feldspar is primarily used in the glass industry (accounting for approximately 50-60%) and the ceramic industry (accounting for approximately 30%). Other applications include chemicals, abrasives, glass fiber, welding rods, enamel and fillers, rubber, coatings, building materials, etc., and are closely related to human life and production. Feldspar ores produced in nature contain a certain amount of impurities to varying degrees. Depending on the industrial purpose, the quality standards of the required feldspar raw materials vary. Generally, large-scale mined feldspar ores require a series of processing before they can be used.

[0004] Feldspar ore is often processed and purified by single or combined beneficiation processes such as crushing, grinding, screening, weak magnetic separation, strong magnetic separation, optical separation, flotation, electrostatic separation, and chemical separation, depending on its properties and associated minerals. Among these processes, conventional beneficiation processes can only produce medium-quality feldspar concentrate products, while high-quality industrial products require complex and multi-combination combined beneficiation processes, which will result in negative impacts such as a significant increase in production costs, a decrease in yield, a longer process flow, large equipment investment, small production scale, increased management difficulty, and serious environmental pollution, which seriously restricts the healthy development of enterprises and the market demand for high-end application fields.

[0005] Therefore, it is an urgent problem to be solved at this stage to develop and design a pure physical, green, environmentally friendly and pollution-free mineral processing process that can produce high-quality feldspar products that meet the demand for raw materials used in high-end fields such as photovoltaic glass, and achieve zero discharge of tailings and tail water through superconducting strong magnetic separation to purify feldspar concentrate. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a method for purifying feldspar concentrate by superconducting strong magnetic separation, which selects reasonable combined mineral processing processes such as crushing, grinding, desludging, strong magnetic roughing, strong magnetic concentration, classification, fine-grained strong magnetic concentration, and solid-liquid separation and dehydration, and selects the raw ore into three products: medium-grained feldspar concentrate and fine-grained feldspar concentrate, which can be used as building materials such as cement and aerated bricks, and can be used as raw materials for photovoltaic glass. The comprehensive utilization rate is 100%, and all processes are green and environmentally friendly physical mineral processing, which does not produce any pollution and does not require the use of flotation technology, achieving zero discharge of tailings and tail water, and is 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:

[0008] The present invention provides a method for purifying feldspar concentrate by superconducting strong magnetic separation, comprising the following steps:

[0009] S1: Crushing: Crushing the raw ore to obtain fine-grained ore;

[0010] S2: Grinding: Grinding the fine-grained ore after slurrying to obtain low-grade feldspar powder;

[0011] S3: Desludging: The low-quality feldspar powder is mixed with slurry and then desludging is performed to obtain high-quality feldspar powder and fine mud, and the fine mud is discharged into the tailings sedimentation tank;

[0012] S4: Strong magnetic roughing: The high-quality feldspar powder is subjected to magnetic separation under a first magnetic field strength to obtain a first magnetic material and a first non-magnetic material, and the first magnetic material is discharged into a tailings sedimentation pond;

[0013] S5: Strong magnetic separation: The first non-magnetic material is subjected to magnetic separation under a second magnetic field strength to obtain a second magnetic material and a second non-magnetic material, and the second magnetic material is discharged into a tailings sedimentation pond; the second magnetic field strength is greater than the first magnetic field strength;

[0014] S6: Classification: Classify the second non-magnetic material to obtain medium-grained products and fine-grained products, and discharge the medium-grained products into the first concentrate sedimentation tank;

[0015] S7: Fine-grained strong magnetic separation: The fine-grained product is subjected to magnetic separation under a third magnetic field strength to obtain a third magnetic material and a third non-magnetic material. The third non-magnetic material is discharged into a second concentrate sedimentation tank, and the third magnetic material is discharged into a tailings sedimentation tank. The third magnetic field strength is greater than the second magnetic field strength.

[0016] S8: solid-liquid separation and dehydration: the products in the tailings sedimentation tank, the first concentrate sedimentation tank and the second concentrate sedimentation tank are subjected to solid-liquid separation operations respectively, and 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.

[0017] As a preferred technical solution, in step S1, the crushing operation includes coarse crushing and fine crushing performed in sequence, and the raw ore is sequentially crushed by a jaw crusher for coarse crushing and by a hammer crusher for fine crushing.

[0018] As a preferred technical solution, in step S2, the fine-grained ore is ground using a ceramic ball mill.

[0019] As a preferred technical solution, in step S3, the low-quality feldspar powder is desludified using a desludging bucket.

[0020] As a preferred technical solution, in step S4, the first magnetic field strength is set to 1.4-1.6 Tesla, an electromagnetic slurry high gradient magnetic separator is used for magnetic separation, and the magnetic separation medium used is set to 4×8 mm diamond-shaped high magnetic permeability stainless steel plate mesh.

[0021] As a preferred technical solution, in step S5, the second magnetic field strength is set to 4.0-4.5 Tesla, a low-temperature superconducting magnetic separator is used for magnetic separation, and the magnetic separation medium used is set to 3×6 mm diamond-shaped high-magnetic permeability stainless steel plate mesh.

[0022] As a preferred technical solution, in step S6, the second magnetic material is classified using a hydrocyclone.

[0023] As a preferred technical solution, in step S7, the third magnetic field strength is set to 4.5-5.0 Tesla, a low-temperature superconducting magnetic separator is used for magnetic separation, and the magnetic separation medium used is set to 2×4 mm diamond-shaped high-magnetic permeability stainless steel plate mesh.

[0024] As a preferred technical solution, in step S8, the product in the tailings sedimentation tank enters the plate and frame filter press for solid-liquid separation and dehydration after precipitation and concentration; the products in the first concentrate sedimentation tank and the second concentrate sedimentation tank enter the ceramic filter for solid-liquid separation and dehydration after precipitation.

[0025] As a preferred technical solution, in step S8, the particle size of the medium-grained feldspar concentrate is +38 The whiteness of the medium-grained feldspar concentrate is not less than 84; the particle size of the fine-grained feldspar concentrate is -38 , the whiteness of the fine-grained feldspar concentrate is not less than 81.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The present invention selects reasonable combined mineral processing process of crushing, grinding, desliming, strong magnetic roughing, strong magnetic concentration, classification, fine-grained strong magnetic concentration, solid-liquid separation and dehydration, etc., to sort the raw ore into three products: medium-grained feldspar concentrate and fine-grained feldspar concentrate which can be used as building materials such as cement and aerated bricks, and raw materials for photovoltaic glass. The comprehensive utilization rate is 100%. Moreover, all processes are green and environmentally friendly physical mineral processing, which does not generate any pollution and does not require the use of flotation process, thereby achieving zero discharge of tailings and tail water, and is suitable for large-scale production and application.

[0028] 2. In view of the differences in hardness, particle size, dissociation degree, specific magnetic susceptibility, etc. between feldspar ore and its associated minerals, the present invention adopts a desludging bucket with high working efficiency and low production cost to carry out desludging operation under the conditions of crushing and grinding to a suitable monomer dissociation fineness, which can remove the fine mud impurities such as calcium oxide, magnesium, iron, titanium, etc. with low hardness and easy to be muddied in advance; adopts electromagnetic slurry high gradient magnetic separator for strong magnetic roughing operation, which can effectively pre-select impurity minerals such as iron oxide and titanium with relatively high specific magnetic susceptibility coefficient, thereby reducing the pressure of subsequent strong magnetic separation; adopts low temperature superconducting magnetic separator for strong magnetic separation operation, which can strengthen the selection of impurity minerals such as iron oxide and titanium oxide with relatively low specific magnetic susceptibility coefficient, thereby producing high-quality feldspar concentrate products; adopts hydrocyclone classification operation, which can directly select +38 Medium-sized high-quality feldspar concentrate products; low-temperature superconducting magnetic separators are used under optimized conditions such as high field strength and narrow medium to separate -38 Deeply strengthen the removal of impurities such as iron oxide and titanium oxide with relatively low magnetic susceptibility coefficient in fine particles, and obtain -38 Fine-grained, high-quality feldspar concentrate products significantly increase product added value.

[0029] 3. The processes of crushing, grinding, desludging and strong magnetic roughing in the present invention are all preliminary auxiliary processes for superconducting strong magnetic purification operations, which can greatly improve the quality of feldspar; after the grading operation, the fine-grained products are further subjected to strong magnetic selection operations to produce high-quality fine-grained feldspar concentrate products; jaw and hammer crushers, ball mills, desludging buckets, electromagnetic slurry magnetic separators, hydrocyclones, superconducting magnetic separators, etc. are all mature industrial machinery and equipment; the filter press water produced by the solid-liquid separation operation can be returned to each operation section for recycling after sedimentation and clarification, achieving zero discharge of tailings; the mixture of fine mud and magnetic matter produced by the desludging operation and the three-stage magnetic separation operation has physical and chemical properties that meet the standards of building materials such as cement and aerated bricks, and can achieve zero discharge of tailings.

[0030] 4. The present invention can remove the non-magnetic, fine-grained calcium, magnesium, aluminum and other gangue impurity minerals doped in the feldspar powder in advance through the desludging process, thereby improving the quality of the feldspar and reducing the magnetic separation pressure.

[0031] 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 enters the high-field strength superconducting magnetic separator, which is easy to cause magnetic medium blockage, resulting in serious entrainment and affecting the mineral processing effect; the magnetic field intensity of each level of magnetic separation of the present invention is gradually increased, and the medium aperture is gradually reduced, so that this part of the iron oxide minerals can be removed in advance at the electromagnetic slurry magnetic separator with relatively low magnetic field intensity, reducing the pressure of subsequent superconducting magnetic separation, so that the superconducting magnetic separator can play a better role; at the same time, the existing mineral processing process system using a conventional vertical ring high-gradient magnetic separator combined with an electromagnetic slurry high-gradient magnetic separator is limited by technical parameters such as equipment magnetic field strength and sorting accuracy. Even if the magnetic separation effect is enhanced through a multi-stage series separation process, the whiteness index of the resulting 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 enhance the selection of weakly magnetic iron-titanium impurity minerals, thereby greatly improving the quality of the concentrate.

[0032] 6. The present invention divides the concentrate product into medium-sized and fine-sized particles through a classification process. Since the fine-sized concentrate product contains a small amount of impurity minerals such as iron and titanium with weak or very weak magnetism, and these impurity minerals have fine particle sizes and low specific magnetic susceptibility, the superconducting strong magnetic separation is carried out under optimized conditions such as finer mesh media and higher magnetic field intensity, which can separate out higher-quality fine-sized concentrate products. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A process flow chart of an embodiment of a method for purifying feldspar concentrate by superconducting strong magnetic separation according to the present invention. DETAILED DESCRIPTION

[0034] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0035] A feldspar concentrator in Jiangxi Province previously used the conventional "crushing-grinding-vertical ring high-intensity magnetic separation-reverse flotation" process to process feldspar concentrate. The resulting concentrate contained elements such as SiO2 67-68%, K2O + Na2O 13-14%, Al2O3 17-18%, Fe2O3 0.05-0.06%, and TiO2 0.02-0.03%, with a brightness of 74-76%. This concentrate met the quality standards for high-end ceramics and glass. However, to meet the demand for high-quality feldspar products in high-end applications such as photovoltaic glass and increase their added value, the company adopted enhanced flotation technology and improved grinding fineness. However, this still proved difficult to produce the high-quality feldspar concentrate required for photovoltaic glass, with concentrations of Fe2O3 <0.02%, TiO2 <0.01%, and a brightness >80%. This hindered the company's healthy development and impacted its production efficiency.

[0036] In order to solve the technical and process problems existing in the production of enterprises, we can ensure that the conventional process can produce high-end feldspar concentrate products with whiteness >75% for glass and ceramics, and also produce high-quality feldspar concentrate products with whiteness >80% required for photovoltaic glass. Figure 1 Table 1 is a specific implementation case of the feldspar concentrator using a method for purifying feldspar concentrate by superconducting strong magnetic separation provided by the present invention, comprising the following steps:

[0037] S1: Broken:

[0038] The -200mm lump ore is fed into the jaw crusher for coarse crushing, and the -30mm ore is fed into the hammer crusher for fine crushing to obtain -5mm fine-grained ore, which can reduce the production cost and efficiency of the next step of grinding operation.

[0039] S2: Grinding:

[0040] The fine-grained ore with a particle size of -5mm is mixed into a 67% slurry concentration and then fed into a ceramic ball mill for grinding to achieve monomer dissociation between feldspar and other minerals. The grinding medium used is a high-aluminum ball to avoid the generation of mechanical iron; -100 Fine low-grade feldspar powder.

[0041] S3: Desludging: -100 The low-quality feldspar powder with fineness is mixed into 30% slurry concentration and enters the desludging bucket for desludging operation to obtain high-quality feldspar powder and fine mud, among which the fine mud is -5 The fineness of the feldspar powder can significantly improve the quality of the feldspar.

[0042] S4: Strong magnetic roughing:

[0043] The high-quality feldspar powder is fed into an electromagnetic slurry high-gradient magnetic separator for the first stage of strong magnetic roughing. The magnetic field strength of the electromagnetic slurry high-gradient magnetic separator is 1.4-1.6 Tesla, and the medium is a 4×8mm diamond-shaped high-magnetic permeability stainless steel plate mesh. Under these parameters, impurity minerals such as iron oxide and titanium oxide (the first magnetic material) with relatively high specific magnetic susceptibility coefficients can be effectively selected, reducing the selection pressure of the higher-field strength superconducting magnetic separator in the next step; the resulting high-quality feldspar concentrate (the first non-magnetic material) has an Fe2O3 content of 0.05-0.06%, a TiO2 content of 0.025-0.030%, and a whiteness of 74-76%. This indicator is similar to the production indicators of the previous conventional "magnetic separation + flotation".

[0044] S5: Strong Magnetic Selection:

[0045] The first non-magnetic material enters a low-temperature superconducting magnetic separator for the second stage of strong magnetic separation. The magnetic field strength of the superconducting magnetic separator is 4.0-4.5 Tesla, and the medium is 3×6mm diamond-shaped high-magnetic permeability stainless steel plate mesh. Under these parameters, impurity minerals such as iron oxide and titanium with relatively low specific magnetic susceptibility coefficients (second magnetic materials) can be removed in an enhanced manner, greatly improving the quality of the feldspar concentrate. A high-quality feldspar concentrate (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.

[0046] S6: Grading:

[0047] The second non-magnetic material enters the hydrocyclone for classification, and +38 Medium-grain products and -38 of fine-grained products; of which +38 The medium-grained product has an Fe2O3 content of 0.014-0.016%, a TiO2 content of 0.007-0.008%, and a whiteness of 83.50-84.50%, reaching the quality standard of high-quality feldspar raw materials used in high-end applications of photovoltaic glass; the fine-grained product of -0.38mm has an Fe2O3 content of 0.026-0.030%, a TiO2 content of 0.016-0.018%, and a whiteness of 76-78%, and still contains a small amount of fine-grained iron oxide, titanium and other impurities in the form of intergrowths or fine particles.

[0048] S7: Fine-grained strong magnetic selection:

[0049] The fine-grained product enters a low-temperature superconducting magnetic separator for the third stage of strong magnetic selection. The magnetic field strength of the superconducting magnetic separator is 4.5-5.0 Tesla, and the medium is a 2×4mm diamond-shaped high-magnetic permeability stainless steel plate mesh. Under these parameters, impurity minerals such as iron oxide and titanium (the third magnetic material) with lower specific magnetic susceptibility coefficient and finer particles can be deeply and intensively selected to obtain fine-grained feldspar concentrate (the non-third 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 standards of high-quality feldspar raw materials used in high-end applications of photovoltaic glass.

[0050] S8: Solid-liquid separation and dehydration: The product in the tailings sedimentation tank is precipitated and concentrated, and then enters the plate and frame filter press for solid-liquid separation and dehydration, so as to obtain raw materials for making cement and aerated bricks; the product in the first concentrate sedimentation tank is precipitated and then enters the ceramic filter for solid-liquid separation, so as to obtain 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 precipitated and then enters the ceramic filter for solid-liquid separation, so as to obtain fine-grained feldspar concentrate with Fe2O3 content of 0.019%, TiO2 content of 0.009% and whiteness of 81.65%; the filter water produced by solid-liquid separation can be returned to each operation section for recycling; the specific mineral processing indicators are shown in Table 1.

[0051] Table 1. Superconducting strong magnetic separation and purification of feldspar concentrate (%)

[0052]

[0053] In other embodiments, the medium-sized product obtained in the classification operation of step S6 and the third magnetic material obtained in the fine-grained strong magnetic separation operation of step S7 can be mixed, and then the mixture is precipitated and sent to a ceramic filter for solid-liquid separation and dehydration to obtain a fineness of -100 , high-quality feldspar concentrate with Fe2O3 content of 0.016-0.018%, TiO2 content of 0.007-0.009% and whiteness of 82-83%.

[0054] It should be noted that, in the mineral processing process of this embodiment, each operation section including crushing, grinding, desliming, strong magnetic roughing, strong magnetic concentration, classification, fine-grained strong magnetic concentration, solid-liquid separation and dehydration adopts green and environmentally friendly physical mineral processing technology, and the tail water produced by the solid-liquid separation operation of all products can be returned to each operation section for recycling after clarification; the jaw crusher, hammer crusher, ceramic ball mill, desliming bucket, electromagnetic slurry high gradient magnetic separator, low-temperature superconducting magnetic separator, hydrocyclone, ceramic filter, plate and frame filter press and other equipment used in the mineral processing process of this embodiment are all mature industrial commonly used equipment and can be suitable for large-scale production.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for purifying feldspar concentrate by superconducting strong magnetic separation, characterized in that: The following steps are involved: S1： Crushing: crushing the raw ore to obtain fine-grained ore; S2: Grinding: Grinding the fine-grained ore after slurrying to obtain low-grade feldspar powder with a fineness of -100 μm; S3: Desludging: The low-quality feldspar powder is mixed into a 30% slurry concentration and then enters a desludging hopper for desludging to obtain high-quality feldspar powder and fine mud. The fine mud has a fineness of -5 μm and is discharged into a tailings sedimentation tank. S4: Strong Magnetic Roughing: The high-quality feldspar powder is subjected to magnetic separation under a first magnetic field strength to obtain a first magnetic material and a first non-magnetic material. The first magnetic material is discharged into a tailings sedimentation pond. The first magnetic field strength is set to 1.4-1.6 Tesla. An electromagnetic slurry high gradient magnetic separator is used for magnetic separation. The magnetic separation medium used is a 4×8 mm diamond-shaped high magnetic permeability stainless steel plate mesh. S5: Strong Magnetic Separation: The first non-magnetic material is subjected to magnetic separation under a second magnetic field strength to obtain a second magnetic material and a second non-magnetic material, and the second magnetic material is discharged into a tailings sedimentation pond; the second magnetic field strength is greater than the first magnetic field strength; the second magnetic field strength is set to 4.0-4.5 Tesla, and a low-temperature superconducting magnetic separator is used for magnetic separation. The magnetic separation medium used is a 3×6 mm diamond-shaped high-magnetic permeability stainless steel plate mesh; S6: Classification: Classify the second non-magnetic material 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 separation: The fine-grained product is subjected to magnetic separation under a third magnetic field strength to obtain a third magnetic material and a third non-magnetic material. The third non-magnetic material is discharged into a second concentrate sedimentation tank, and the third magnetic material is discharged into a tailings sedimentation tank. The third magnetic field strength is greater than the second magnetic field strength. The third magnetic field strength is set to 4.5-5.0 Tesla. A low-temperature superconducting magnetic separator is used for magnetic separation. The magnetic separation medium used is a 2×4 mm diamond-shaped high-magnetic-permeability stainless steel plate mesh. S8: solid-liquid separation and dehydration: the products in the tailings sedimentation tank, the first concentrate sedimentation tank and the second concentrate sedimentation tank are subjected to solid-liquid separation operations respectively, and the separated solids are building material raw materials, medium-grained feldspar concentrate and fine-grained feldspar concentrate respectively, and the separated liquids can be recycled; the particle size of the medium-grained feldspar concentrate is +38μm, and the whiteness of the medium-grained feldspar concentrate is not less than 84; the particle size of the fine-grained feldspar concentrate is -38μm, and the whiteness of the fine-grained feldspar concentrate is not less than 81.

2. The method for purifying feldspar concentrate by superconducting strong magnetic separation according to claim 1, characterized in that: In step S1 , the crushing operation includes a coarse crushing operation and a fine crushing operation performed sequentially. The raw ore is sequentially crushed by a jaw crusher for coarse crushing and by a hammer crusher for fine crushing.

3. The method for purifying feldspar concentrate by superconducting strong magnetic separation according to claim 1, characterized in that: In step S2, the fine-grained ore is ground using a ceramic ball mill.

4. The method for purifying feldspar concentrate by superconducting strong magnetic separation according to claim 1, characterized in that: In step S3, the low-quality feldspar powder is desludged using a desludging bucket.

5. The method for purifying feldspar concentrate by superconducting strong magnetic separation according to claim 1, characterized in that: In step S6, the second magnetic material is classified using a hydrocyclone.

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

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