A grinding method, grinding apparatus and application for tin polymetallic ores

Abstract

This invention relates to the field of mineral processing technology, specifically to a grinding method, grinding apparatus, and application for tin polymetallic ore. The grinding method for tin polymetallic ore includes: (a) subjecting the raw ore to a first crushing and a first screening; subjecting the undersize material from the first screening to a linear vibrating screen; (b) subjecting the oversize material from the linear vibrating screen to a rod mill and a first cyclone classification; subjecting the overflow product from the first cyclone classification to a second screening; subjecting the underflow product from the first cyclone classification to a linear vibrating screen; (c) subjecting the undersize material from the linear vibrating screen to a second screening; (d) subjecting the oversize material from the second screening to a ball mill and a second cyclone classification, wherein the overflow product from the second cyclone classification is the target product; and the underflow product from the second cyclone classification is subject to the second screening. This grinding method can reduce the degree of over-grinding of tin polymetallic ore during crushing and grinding, and increase the content of intermediate particle size.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and more specifically, to a grinding method, grinding apparatus, and application of tin polymetallic ore. Background Technology

[0002] Before ore beneficiation, crushing and grinding are necessary. In the beneficiation of tin polymetallic ore, the recovery rate of cassiterite is directly related to the particle size distribution of the ore. Insufficient liberation makes it difficult to effectively separate valuable metals; excessively fine grinding particles cause cassiterite to easily become muddy, resulting in the loss of tin metal into the tailings. Therefore, rationally designing the crushing and grinding process to increase the content of selectable particle sizes is of great significance for the comprehensive recovery of tin polymetallic ore.

[0003] Currently, to simplify the grinding process and equipment configuration, concentrators typically employ a single-stage grinding process when the required grinding fineness is -0.074mm particle size content not exceeding 80%. However, single-stage grinding mills have a wide feed particle size range, low grinding efficiency, and poor particle size characteristics in the ground product, which is detrimental to beneficiation. Therefore, improving the content of intermediate particle size in tin polymetallic ore grinding products has become a challenging research area in this field.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] To address the technical challenge of over-grinding and low content of intermediate particle size in the grinding process of tin polymetallic ores, this invention provides a grinding method, grinding apparatus, and application for tin polymetallic ores. The grinding method for tin polymetallic ores is based on precise grinding and classification, thereby increasing the content of easily sortable particle size in the material.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: One aspect of the present invention relates to a grinding method for tin polymetallic ore, comprising the following steps: (a) The raw ore is subjected to a first crushing and a first screening; the undersize material from the first screening is subjected to a linear vibrating screen. The particle size of the undersize material from the first screening is less than 12 mm; (b) The oversize material from the linear vibrating screen is subjected to rod milling and first cyclone classification; the overflow product from the first cyclone classification is subjected to second screening; the underflow product from the first cyclone classification is subjected to the linear vibrating screen. (c) The undersize material from the linear vibrating screen is subjected to a second screening, wherein the undersize material from the second screening is the target product; (d) The oversize material from the second sieve is subjected to ball milling and second cyclone classification, wherein the overflow product from the second cyclone classification is the target product; the underflow product from the second cyclone classification is subjected to the second sieve. The particle size of the undersize material from the linear vibrating screen is less than 1.2 mm; the particle size of the target product is less than 0.2 mm.

[0007] The grinding method for tin polymetallic ore described above can reduce the degree of over-grinding during the crushing and grinding process of tin polymetallic ore and increase the content of intermediate particle size.

[0008] Another aspect of the present invention relates to a grinding apparatus for implementing the grinding method of the tin polymetallic ore, comprising: a first crushing component, a circular vibrating screen component, a linear vibrating screen component, a rod mill component, a high-frequency fine screen component, a ball mill component, a first cyclone classifier component, and a second cyclone classifier component. The first crushing component, the circular vibrating screen component, the linear vibrating screen component, and the high-frequency fine screen component are connected in sequence; The oversize outlet of the linear vibrating screen component is connected to the feed inlet of the rod mill component; the discharge outlet of the rod mill component is connected to the feed inlet of the first cyclone classifier component; the overflow product outlet of the first cyclone classifier component is connected to the feed inlet of the high-frequency fine screen component; and the underflow product outlet of the first cyclone classifier component is connected to the feed inlet of the linear vibrating screen component. The outlet of the oversize material of the high-frequency fine sieve component is connected to the inlet of the ball mill component; the outlet of the ball mill component is connected to the inlet of the second cyclone classifier component; and the outlet of the underflow product of the second cyclone classifier component is connected to the inlet of the high-frequency fine sieve component.

[0009] The grinding device is used for grinding tin polymetallic ore, and the resulting grinding product has a high content of intermediate particle size.

[0010] Another aspect of the present invention relates to a method for recycling tin polymetallic ore, including a grinding method for the tin polymetallic ore.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The grinding method for tin polymetallic ore provided by the present invention can reduce the degree of over-grinding of tin polymetallic ore during the crushing and grinding process, increase the content of intermediate particle size material, and allow the +1.2mm and -1.2mm ores after separation in the precision grinding and classification process to enter different grinding processes, different grinding media and grinding concentrations respectively, so as to achieve differentiated grinding. This can reduce the over-grinding of cassiterite while effectively increasing the content of intermediate easily sortable particle size material.

[0012] (2) The grinding device provided by the present invention is used for grinding tin polymetallic ore. The resulting grinding product has a high content of intermediate particle size material, and the tin polymetallic ore is not prone to over-grinding. Jaw crusher and cone crusher are used to crush the ore before it enters the mill, reducing the particle size of the ore entering the mill and achieving "more crushing and less grinding". A linear vibrating screen is used to classify the crushed material, realizing the classification of ore with two properties: +1.2mm and -1.2mm. The two particle size ores with different particle size composition and relative grindability enter different grinding and classification processes to achieve selective grinding. The two ores after separation enter different grinding and classification processes, different grinding media and grinding concentration processes to achieve differentiated grinding and accurate grinding and classification. The classification equipment uses a linear vibrating screen and a high-frequency vibrating screen in linkage, which can improve the classification efficiency during grinding. While ensuring the stability and uniformity of the two grinding processes, it effectively increases the content of easily sorted particle size. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the grinding apparatus provided in an embodiment of the present invention.

[0015] Figure label: 1-First crushing component, 2-Circular vibrating screen component, 3-First cyclone classifying component, 4-Powder ore storage component, 5-Linear vibrating screen component, 6-Rod mill component, 7-High frequency fine screen component, 8-Ball mill component, 9-Second crushing component, 10-Second cyclone classifying component. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0017] One aspect of the present invention relates to a grinding method for tin polymetallic ore, comprising the following steps: (a) The raw ore is subjected to a first crushing and a first screening; the undersize material from the first screening is subjected to a linear vibrating screen. The particle size of the undersize material in the first screening is less than 12 mm (e.g., 0.01 mm, 0.1 mm, 1 mm, 3 mm, 5 mm, 7 mm, 10 mm or 11.99 mm); a particle size of less than 12 mm is conducive to the full dissociation of ore and gangue, and increases the adsorption capacity of minerals and reagents. (b) The oversize material from the linear vibrating screen is subjected to rod milling and first cyclone classification; the overflow product from the first cyclone classification is subjected to second screening; the underflow product from the first cyclone classification is subjected to the linear vibrating screen. (c) The undersize material from the linear vibrating screen is subjected to a second screening, wherein the undersize material from the second screening is the target product; (d) The oversize material from the second sieve is subjected to ball milling and second cyclone classification, wherein the overflow product from the second cyclone classification is the target product; the underflow product from the second cyclone classification is subjected to the second sieve. The particle size of the undersize material from the linear vibrating screen is less than 1.2 mm (e.g., 0.01 mm, 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, or 1.19 mm); the particle size of the target product is less than 0.2 mm (e.g., 0.01 mm, 0.03 mm, 0.05 mm, 0.1 mm, 0.15 mm, 0.18 mm, or 0.19 mm). A particle size of less than 1.2 mm facilitates the complete dissociation of ore and gangue, increasing the adsorption capacity of minerals and reagents.

[0018] The grinding method for tin polymetallic ore described above can reduce the degree of over-grinding during the crushing and grinding process, increase the content of intermediate particle size, and achieve differentiated grinding by having the oversize and undersize ores after separation in a precision grinding and classification process enter different grinding processes, different grinding media, and different grinding concentrations. This reduces the probability of over-grinding of cassiterite and effectively increases the content of easily beneficiated intermediate particle size. Precision grinding, by utilizing different media, processes, and concentrations, differentiates the degree of liberation of different ores, and through pre-screening and classification, achieves precise liberation of the ore.

[0019] Furthermore, during the rod milling process, the filling rate of the rod milling media is 50% to 65% (e.g., 50%, 53%, 55%, 58%, 60%, 63%, or 65%), and the slurry concentration is 50 wt% to 70 wt% (e.g., 50 wt%, 55 wt%, 60 wt%, 65 wt%, or 70 wt%). Under these conditions, over-grinding of cassiterite can be reduced, and the content of easily sortable intermediate particle sizes can be increased.

[0020] Furthermore, during the ball milling process, the filling rate of the milling media is 50% to 60% (e.g., 50%, 53%, 55%, 58%, 60%, 63%, or 65%), and the slurry concentration is 50 wt% to 70 wt% (e.g., 50 wt%, 55 wt%, 60 wt%, 65 wt%, or 70 wt%). Under these conditions, over-grinding of cassiterite can be reduced, and the content of easily sortable intermediate particle sizes can be increased.

[0021] The media filling rate of rod mills and ball mills determines the grinding efficiency, while the slurry concentration determines the grinding particle size.

[0022] Furthermore, the raw ore has a particle size ≤350mm (e.g., 0.5mm, 1mm, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, or 350mm). Raw ore at this particle size is easier to crush and screen.

[0023] Further, the material oversize from the first screening is subjected to a second crushing; the product from the second crushing is then subjected to the first screening.

[0024] Furthermore, the particle size of the material remaining on the first sieve is greater than 12 mm.

[0025] Furthermore, the particle size of the material on the screen of the linear vibrating screen is greater than 1.2 mm.

[0026] Furthermore, the particle size of the material remaining on the second sieve is greater than 0.2 mm.

[0027] Another aspect of the invention relates to a grinding apparatus for implementing the aforementioned grinding method for tin polymetallic ore, such as... Figure 1 As shown, it includes: a first crushing component 1, a circular vibrating screen component 2, a linear vibrating screen component 5, a rod mill component 6, a high-frequency fine screen component 7, a ball mill component 8, a first cyclone classifier component 3, and a second cyclone classifier component 10. The first crushing component 1, the circular vibrating screen component 2, the linear vibrating screen component 5, and the high-frequency fine screen component 7 are connected in sequence; The oversize outlet of the linear vibrating screen component 5 is connected to the feed inlet of the rod mill component 6; the discharge outlet of the rod mill component 6 is connected to the feed inlet of the first cyclone classifier 3; the overflow product outlet of the first cyclone classifier 3 is connected to the feed inlet of the high-frequency fine screen component 7; and the underflow product outlet of the first cyclone classifier 3 is connected to the feed inlet of the linear vibrating screen component 5. The outlet of the oversize material of the high-frequency fine sieve component 7 is connected to the inlet of the ball mill component 8; the outlet of the ball mill component 8 is connected to the inlet of the second cyclone classifier 10; and the outlet of the underflow product of the second cyclone classifier 10 is connected to the inlet of the high-frequency fine sieve component 7.

[0028] The grinding device is used for grinding tin polymetallic ore. The resulting grinding product has a high content of intermediate particle size, and the tin polymetallic ore is less likely to be over-crushed.

[0029] Jaw crushers and cone crushers are used to crush the ore before it enters the mill, reducing the particle size of the ore and achieving "more crushing, less grinding". A linear vibrating screen is used to classify the crushed material, achieving the classification of ores with two properties: +1.2mm and -1.2mm. The two particle sizes with different particle size composition and relative grindability enter different grinding and classification processes to achieve selective grinding. After separation, the two types of ores enter different grinding and classification processes, different grinding media and grinding concentrations respectively to achieve differentiated grinding and precise grinding and classification. The classification equipment uses a combination of linear vibrating screens and high-frequency vibrating screens to improve the classification efficiency during grinding, effectively increasing the content of easily sorted particle sizes while ensuring the stability and consistency of the two grinding processes.

[0030] Furthermore, the grinding device also includes a second crushing component 9 and a fine ore storage component 4. The fine ore storage component 4 is used to store the crushed products of the second crushing component 9.

[0031] Furthermore, the oversize outlet of the circular vibrating screen component 2 is connected to the feed inlet of the second crushing component 9; the discharge outlet of the second crushing component 9 is connected to the feed inlet of the powder storage component 4; the discharge outlet of the powder storage component 4 is connected to the feed inlet of the linear vibrating screen component 5. The second crushing component 9 crushes the ore before it enters the mill, reducing the particle size of the ore entering the mill, thus achieving "more crushing and less grinding".

[0032] In some specific embodiments, the first crushing component 1 includes, but is not limited to, a jaw crusher.

[0033] In some specific embodiments, the circular vibrating screen component 2 includes, but is not limited to, a circular vibrating screen.

[0034] In some specific embodiments, the present invention uses conventional transportation tools to complete the logistics transfer of the entire device, such as conveyor belts.

[0035] In some specific embodiments, the linear vibrating screen component 5 includes, but is not limited to, a linear vibrating screen.

[0036] In some specific embodiments, the rod milling component 6 includes, but is not limited to, a rod mill.

[0037] In some specific embodiments, the high-frequency fine sieve component 7 includes, but is not limited to, a high-frequency fine sieve.

[0038] In some specific embodiments, the ball milling component 8 includes, but is not limited to, a ball mill.

[0039] In some specific embodiments, the second crushing component 9 includes, but is not limited to, a cone crusher.

[0040] In some specific embodiments, the first swirl classifier and the second swirl classifier include, but are not limited to, cyclones.

[0041] Another aspect of the present invention relates to a method for recycling tin polymetallic ore, including a grinding method for the tin polymetallic ore.

[0042] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0043] Example 1 The grinding method for tin polymetallic ore provided in this embodiment uses 1000 kg of tin polymetallic ore from a certain area in Guangxi. The main mineral composition is cassiterite, brittle stibnite, sphalerite, ferro-zinc sphalerite, pyrite, quartz, and calcite, etc., and includes the following steps: 1. The raw ore with a diameter of 340~350mm is first crushed in a jaw crusher and first screened on a circular vibrating screen. The ore with a particle size of less than 12mm from the first screening is fed into the powder ore bin via a conveyor belt. The material is then slowly fed into a linear vibrating screen for linear vibrating screening through the feeding device at the bottom of the powder ore bin. 2. Material with a particle size greater than 12mm from the first screening enters the cone crusher for the second crushing, and the product from the second crushing is returned to the circular vibrating screen for the first screening. 3. Material with a particle size greater than 1.2mm on the linear vibrating screen is pumped into a rod mill for rod milling. The rod mill has a media filling rate of 65% and a slurry concentration of 50wt%. The product of the rod mill is pumped back to the linear vibrating screen for linear vibrating screening. 4. The material with a particle size of less than 1.2 mm under the linear vibrating screen flows by gravity into the high-frequency fine screen for a second screening. The material with a particle size of less than 0.2 mm under the second screening is the target product and can be entered into subsequent sorting. 5. Material with a particle size greater than 0.2mm on the linear vibrating screen is pumped into a two-stage fine grinding ball mill by a slurry pump for ball milling. The ball mill has a media filling rate of 50% and a slurry concentration of 50wt%. The ball milling product is returned to the high-frequency fine screen for a second screening.

[0044] After the above processing, the particle size distribution of the target product is shown in Table 1: Table 1. Particle size distribution of the final grinding product

[0045] Example 2 The grinding method for tin polymetallic ore provided in this embodiment uses 1000 kg of tin polymetallic ore from a certain place in Inner Mongolia as the raw ore. The main mineral composition is cassiterite, galena, pyrite, sphalerite, quartz and calcite. The difference from Embodiment 1 is that the media filling rate of the rod mill in step 3 is 60% and the slurry concentration is 65 wt%, while the media filling rate of the ball mill in step 5 is 60% and the slurry concentration is 70 wt%.

[0046] After the above processing, the particle size distribution of the target product is shown in Table 2: Table 2 Particle size distribution of the final grinding product

[0047] Example 3 The grinding method for tin polymetallic ore provided in this embodiment uses 1000 kg of tin polymetallic ore from a certain place in Yunnan Province as the raw ore. The main mineral composition is cassiterite, galena, pyrite, sphalerite, quartz and calcite. The difference from Embodiment 1 is that the media filling rate of the rod mill in step 3 is 50% and the slurry concentration is 65 wt%, while the media filling rate of the ball mill in step 5 is 55% and the grinding concentration is 65 wt%.

[0048] After the above processing, the particle size distribution of the target product is shown in Table 3: Table 3 Particle size distribution of the final grinding product

[0049] Example 4 The grinding apparatus provided in this embodiment is used to implement the grinding methods of embodiments 1 to 3, and includes: a first crushing component 1, a circular vibrating screen component 2, a linear vibrating screen component 5, a rod mill component 6, a high-frequency fine screen component 7, a ball mill component 8, a first cyclone classifier component 3, a second cyclone classifier component 10, a second crushing component 9, and a powder storage component. The first crushing component 1, the circular vibrating screen component 2, the linear vibrating screen component 5, and the high-frequency fine screen component 7 are connected in sequence; The oversize outlet of the linear vibrating screen component 5 is connected to the feed inlet of the rod mill component 6; the discharge outlet of the rod mill component 6 is connected to the feed inlet of the first cyclone classifier 3; the overflow product outlet of the first cyclone classifier 3 is connected to the feed inlet of the high-frequency fine screen component 7; and the underflow product outlet of the first cyclone classifier 3 is connected to the feed inlet of the linear vibrating screen component 5. The outlet of the oversize material of the high-frequency fine sieve component 7 is connected to the inlet of the ball mill component 8; the outlet of the ball mill component 8 is connected to the inlet of the second cyclone classifier 10; the outlet of the underflow product of the second cyclone classifier 10 is connected to the inlet of the high-frequency fine sieve component 7. The oversize outlet of the circular vibrating screen component 2 is connected to the feed inlet of the second crushing component 9; the discharge outlet of the second crushing component 9 is connected to the feed inlet of the powder storage component 4; and the discharge outlet of the powder storage component 4 is connected to the feed inlet of the linear vibrating screen component 5.

[0050] Comparative Example 1 The raw ore was the same as in Example 3. No classification treatment was performed before grinding; the ore was directly ground using a ball mill. The particle size distribution after grinding is shown in Table 4.

[0051] Table 4 Particle size distribution of the final grinding product

[0052] Comparative Example 2 The difference between this comparative example and Example 3 is that the media filling rate of the rod mill in step 3 is 45%, and the slurry concentration is 45 wt%. The particle size distribution after grinding is shown in Table 5.

[0053] Table 5 Particle size distribution of the final grinding product

[0054] Comparative Example 3 The difference between this comparative example and Example 3 is that the media filling rate of the ball mill in step 5 is 45%, and the grinding concentration is 75 wt%. The particle size distribution after grinding is shown in Table 6.

[0055] Table 6 Particle size distribution of the final grinding product

[0056] Comparative Example 4 The difference between this comparative example and Example 3 is that the particle size of the undersize material from the first screening is less than 10 mm, and the particle size of the undersize material from the linear vibrating screen is less than 1 mm. The particle size distribution after grinding is shown in Table 7.

[0057] Table 7 Particle size distribution of the final grinding product

[0058] By comparing the comparative examples and the embodiments, it can be found that in the embodiments, the content of +0.15mm particle size in the grinding product is 2.08%-14.48%, and the tin distribution rate is 1.55%-38.75%; the content of +0.037mm particle size is 48.50%-60.47%, and the tin distribution rate is 60.90%-74.72%; the content of -0.019mm particle size is 7.43%-22.27%, and the tin distribution rate is 3.53%-12.48%.

[0059] Comparative Example 1: The yield of the grinding product was 0% for the +0.15mm particle size; the content of the +0.037mm particle size was 14.79%, and the tin distribution rate was 32.06%; the content of the -0.019mm particle size was 52.90%, and the tin distribution rate was 26.93%.

[0060] Comparative Example 2: The yield of the grinding product in the +0.15mm particle size fraction was 0%; the content of the +0.037mm particle size fraction was 13.92%, with a tin distribution of 29.61%; the content of the -0.019mm particle size fraction was 44.95%, with a tin distribution of 22.36%. Comparative Example 3: The yield of the grinding product in the +0.15mm particle size fraction was 0%; the content of the +0.037mm particle size fraction was 10.6%, with a tin distribution of 16.97%; the content of the -0.019mm particle size fraction was 44.17%, with a tin distribution of 27.81%.

[0061] Comparative Example 4: The yield of the grinding product was 0% for the +0.15mm particle size; the content of the +0.037mm particle size was 10.6%, and the tin distribution rate was 15.50%; the content of the -0.019mm particle size was 42.71%, and the tin distribution rate was 12.80%.

[0062] In summary, the grinding method proposed in this invention reduces the content of excessively fine particles and increases the content of easily sortable intermediate particles.

[0063] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A grinding method for tin polymetallic ore, characterized in that, Includes the following steps: (a) The raw ore is subjected to a first crushing and a first screening; the undersize material from the first screening is subjected to a linear vibrating screen. The particle size of the undersize material from the first screening is less than 12 mm; The particle size of the raw ore is ≤350mm; (b) The oversize material from the linear vibrating screen is subjected to rod milling and first cyclone classification; the overflow product from the first cyclone classification is subjected to second screening; the underflow product from the first cyclone classification is subjected to the linear vibrating screen. (c) The undersize material from the linear vibrating screen is subjected to a second screening, wherein the undersize material from the second screening is the target product; The particle size of the undersize material from the linear vibrating screen is less than 1.2 mm; the particle size of the target product is less than 0.2 mm. (d) The oversize material from the second sieve is subjected to ball milling and second cyclone classification, wherein the overflow product from the second cyclone classification is the target product; the underflow product from the second cyclone classification is subjected to the second sieve. When performing the rod mill, the filling rate of the rod mill media is 50%~65%, and the slurry concentration is 50wt%~70wt%. During the ball milling process, the filling rate of the ball milling media is 50% to 60%, and the slurry concentration is 50 wt% to 70 wt%.

2. The grinding method for tin polymetallic ore according to claim 1, characterized in that, The material oversized by the first screening is subjected to a second crushing; the product of the second crushing is subjected to the linear vibrating screening.

3. The grinding method for tin polymetallic ore according to claim 1, characterized in that, The particle size of the material on the first sieve is greater than 12 mm.

4. The grinding method for tin polymetallic ore according to claim 1, characterized in that, The particle size of the material on the linear vibrating screen is greater than 1.2 mm.

5. The grinding method for tin polymetallic ore according to claim 1, characterized in that, The particle size of the material remaining on the second sieve is greater than 0.2 mm.

6. A grinding apparatus for implementing the grinding method for tin polymetallic ore according to any one of claims 1 to 5, characterized in that, include: The components include a first crushing component, a circular vibrating screen component, a linear vibrating screen component, a rod mill component, a high-frequency fine screen component, a ball mill component, a first cyclone classifier component, and a second cyclone classifier component. The first crushing component, the circular vibrating screen component, the linear vibrating screen component, and the high-frequency fine screen component are connected in sequence; The oversize outlet of the linear vibrating screen component is connected to the feed inlet of the rod mill component; the discharge outlet of the rod mill component is connected to the feed inlet of the first cyclone classifier component; the overflow product outlet of the first cyclone classifier component is connected to the feed inlet of the high-frequency fine screen component; and the underflow product outlet of the first cyclone classifier component is connected to the feed inlet of the linear vibrating screen component. The outlet of the oversize material of the high-frequency fine sieve component is connected to the inlet of the ball mill component; the outlet of the ball mill component is connected to the inlet of the second cyclone classifier component; and the outlet of the underflow product of the second cyclone classifier component is connected to the inlet of the high-frequency fine sieve component.

7. The grinding apparatus according to claim 6, characterized in that, The grinding device further includes: a second crushing component and a fine ore storage component; The outlet of the circular vibrating screen component is connected to the feed inlet of the second crushing component; the outlet of the second crushing component is connected to the feed inlet of the powder storage component; and the outlet of the powder storage component is connected to the feed inlet of the linear vibrating screen component.

8. A method for recycling tin polymetallic ore, characterized in that, The grinding method for tin polymetallic ore as described in any one of claims 1 to 5.

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