Method for comprehensive recovery of associated tungsten and tin in iron lepidolite ore

Abstract

The application discloses a method for comprehensively recovering associated tungsten and tin in iron lepidolite ore, and comprises the following steps: crushing and screening the iron lepidolite ore, returning the oversize product to the crushing process, and performing the next stage of grinding and classification on the undersize product; performing gravity separation on the grinding product and the classified product respectively to obtain tungsten-tin concentrates; performing magnetic separation on the tungsten-tin concentrates to obtain tungsten concentrates and tin concentrates respectively; performing high-intensity magnetic separation on the gravity separation tailings to obtain iron lepidolite concentrates. The method can realize early recovery and comprehensive recovery, has the advantages of being clean and non-toxic, reasonable in process, high in recovery efficiency, small in loss of coarse and fine metal particles, and high in separation efficiency, can comprehensively recover lithium concentrates with high Li2O grade and high recovery rate, and can comprehensively recover associated valuable elements, is a new beneficiation process which is high in separation effect, economic and environmental protection, can efficiently recover tungsten and tin resources from low-grade iron lepidolite ore, and is high in use value and good in application prospect.

Description

Technical Field

[0001] This invention belongs to the field of lithium polymetallic mineral beneficiation and relates to a method for the comprehensive recovery of associated tungsten and tin from lithium mica ore. Background Technology

[0002] Lithium iron phosphate mica (KLiFeAl[AlSi3O) 10 Lithium ore (F, OH)₂ is one of the main mineral sources for lithium extraction. However, lithium ore also contains associated low-grade rare metal ores, such as wolframite, cassiterite, and tantalum. These rare metals are also important resources that need to be comprehensively recovered. However, due to the extremely low grade of rare metals in the raw ore, traditional gravity separation, flotation, and their combined processes are insufficient for the effective enrichment and recovery of rare metals. Furthermore, the significant differences in the properties of different ores make it difficult for existing beneficiation processes to effectively separate lithium ore from rare metals. In addition, existing beneficiation processes for separating lithium ore, tungsten, and tin still have the following drawbacks: severe loss of fine-grained resources; high cross-contamination between tungsten and tin concentrates; complex processes; and low separation efficiency. To address the aforementioned deficiencies, the inventors of this application have proposed a grading and separation method for the comprehensive recovery of lithium, tin, and tungsten from lithium polymetallic ores. Utilizing the differences in the degree of liberation, specific gravity, and magnetic properties of the target minerals, a grading and separation technology approach is adopted: “coarse grinding – grading – coarse and fine particle gravity separation for tungsten and tin recovery – tungsten and tin strong magnetic separation – coarse particle gravity separation tailings magnetic levitation combined recovery of lithium – fine particle gravity separation tailings slurry magnetic separation for lithium recovery.” This approach maximizes the recovery of minerals of different particle sizes. However, this grading and separation method still has the following shortcomings: (1) The grinding product has a small particle size, resulting in a large amount of fine tungsten and tin minerals, causing a significant loss of fine tungsten and tin particles in the tailings during the gravity separation process; (2) The coarse particles that have been liberated cannot be recovered in a timely manner during gravity separation; (3) The ore in the shaking table is not recovered, leading to a low gravity separation recovery rate. Therefore, overcoming the above-mentioned defects and obtaining a clean, non-toxic, rationally designed, highly efficient, and efficient method for the comprehensive recovery of associated tungsten and tin from lithium iron ore with minimal loss of coarse and fine metal particles and high sorting efficiency is of great practical significance for achieving the comprehensive recovery of tungsten, tin, and lithium from lithium iron ore, as well as improving the comprehensive utilization rate and added value of lithium iron ore resources. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for the comprehensive recovery of associated tungsten and tin in lithium mica ore that is clean and non-toxic, has a reasonable process, high recovery efficiency, low loss of coarse and fine metal particles, and high sorting efficiency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A method for the comprehensive recovery of associated tungsten and tin from lithium mica ore includes the following steps:

[0006] S1. Crushing and screening the lithium mica ore raw material to obtain coarse product A on the screen and product A below the screen.

[0007] S2. Grind and screen the undersize product A to obtain the coarse oversize product B and the undersize product B.

[0008] S3. Adjust the slurry concentration of the undersize product B to ≤60%, and perform gravity separation on the undersize product B to obtain gravity concentrate A and gravity tailings A;

[0009] The subsequent processing of the gravity concentrate A includes the following steps:

[0010] (1.1) The gravity concentrate A is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K1, shaking table middlings K1 and shaking table tailings K1;

[0011] (1.2) The middlings K1 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K1 and tailings K1 from the shaking table concentrate;

[0012] The subsequent processing of the gravity separation tailings A includes the following steps:

[0013] (2.1) The gravity separation tailings A are subjected to high-frequency screening to obtain coarse product A and fine product A;

[0014] (2.2) The fine-particle product A is classified by hydrocyclone to obtain the sediment product B and the overflow product B;

[0015] The subsequent processing of the sediment product B includes the following steps:

[0016] (3.1) The sediment product B is subjected to gravity separation to obtain gravity concentrate B and gravity tailings B;

[0017] (3.2) The gravity concentrate B is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K2, shaking table middlings K2 and shaking table tailings K2;

[0018] (3.3) The middlings K2 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K2 and tailings K2 from the shaking table concentrate;

[0019] The subsequent processing of the overflow product B includes the following steps:

[0020] (4.1) The overflow product B is subjected to gravity separation to obtain gravity concentrate C and gravity tailings C;

[0021] (4.2) The gravity concentrate C is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K3, shaking table middlings K3 and shaking table tailings K3;

[0022] (4.3) The middlings K3 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K3 and tailings K3 from the shaking table concentrate;

[0023] The subsequent processing of the tungsten-tin concentrates K1, K2, and K3 includes the following steps:

[0024] (5.1) Collect tungsten-tin concentrate K1, tungsten-tin concentrate K2 and tungsten-tin concentrate K3, mix them to obtain a mixture of tungsten-tin concentrates;

[0025] (5.2) The mixture of tungsten and tin concentrates is subjected to strong magnetic separation to obtain tungsten concentrate and non-magnetic products;

[0026] (5.3) Grinding non-magnetic products;

[0027] (5.4) The slurry after grinding is subjected to shaking table cleaning to obtain tin concentrate and shaking table cleaning tailings K4;

[0028] The subsequent processing of gravity separation tailings B, gravity separation tailings C, shaking table-refined tailings K2, and shaking table-refined tailings K3 includes the following steps:

[0029] (6.1) Collect gravity separation tailings B, gravity separation tailings C, shaking table refined tailings K2, and shaking table refined tailings K3, mix them, and obtain a mixture of lithium iron ore and mica ore.

[0030] (6.2) The mixture of lithium iron ore and mica is subjected to strong magnetic separation to obtain lithium iron ore concentrate and tailings.

[0031] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by the following step S1: the particle size of the lithium mica ore raw material is crushed to below 8mm; the coarse product A on the sieve is mixed with the lithium mica ore raw material and then crushed again.

[0032] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by using a ball mill to grind the undersize product A in step S2.

[0033] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by using a 2mm sieve to screen the ground product in step S2; the particle size of the coarse product B on the sieve is >2mm; the coarse product B on the sieve is mixed with the product A under the sieve and then ground again.

[0034] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by adjusting the slurry concentration of the undersize product B to 30%–60% in step S3.

[0035] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by using a gravity separation roughing device to perform gravity separation on the undersize product B in step S3; the gravity separation roughing device is a Nelson gravity separator or a spiral chute.

[0036] A further improvement to the aforementioned method for the comprehensive recovery of associated tungsten and tin from lithium iron ore mica is that, when using the Nelson gravity separator to perform gravity separation on the undersize product B, the centrifugal acceleration during the gravity separation process is 90G–100G, and the rinsing water flow rate is 20m. 3 / h~30m 3 / h.

[0037] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by including the following steps in the subsequent processing of the shaking table-selected tailings K1 and coarse-grained product A:

[0038] (7.1) Collect tailings K1 and coarse product A by shaking table beneficiation;

[0039] (7.2) The tailings K1 selected by the shaking table, the coarse product A and the screened product A are mixed and ground.

[0040] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (1.1) in which a coarse sand shaking table is used to perform a single shaking table cleaning of gravity concentrate A; during the single shaking table cleaning process, the stroke is 20mm to 30mm, the stroke rate is 230 to 250 times / min, and the feed concentration is 25% to 35%.

[0041] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (1.2) using a high-frequency screening machine to classify the gravity separation tailings A; during the high-frequency screening process, the aperture of the screen is 0.15 mm and the feed concentration is 25% to 35%.

[0042] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by using a high-frequency screening machine to classify gravity separation tailings A in step (2.1); during the high-frequency screening process, the aperture of the screen is 0.15 mm and the feed concentration is 25% to 35%.

[0043] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (2.2) in which a hydrocyclone is used to classify the fine-particle product A; during the hydrocyclone classification process, the feed concentration is 18% to 25% and the feed pressure is 0.1 MPa to 0.12 MPa; the overflow product B has a particle size of -45 μm accounting for 80% to 85%.

[0044] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (3.1) using a gravity separation roughing device to perform gravity separation on the sediment product B; the gravity separation roughing device is any one of a Nelson gravity separator or a spiral chute.

[0045] A further improvement to the aforementioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore involves using the Nelson gravity separator to perform gravity separation on the sediment product B. During this separation process, the centrifugal acceleration is 90G–100G, the feed concentration is 30%–35%, and the wash water flow rate is 20m. 3 / h~30m 3 / h.

[0046] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (3.2) in which a fine sand shaking table is used to perform a single shaking table cleaning of gravity concentrate B; during the single shaking table cleaning process, the stroke is 15mm to 20mm, the stroke rate is 250 to 275 times / min, and the feed concentration is 25% to 30%.

[0047] The above-mentioned method for the comprehensive recovery of associated tungsten and tin in lithium mica ore is further improved by step (3.3) in which a fine sand shaking table is used to perform secondary shaking table refining on the middlings K2 from the shaking table refining process; during the secondary shaking table refining process, the stroke is 15mm to 20mm, the stroke rate is 250 to 275 times / min, and the feed concentration is 25% to 30%.

[0048] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (4.1) using a gravity separation roughing device to perform gravity separation on the overflow product B; the gravity separation roughing device is any one of a Nelson gravity separator or a spiral chute.

[0049] A further improvement to the aforementioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore involves using the Nielsen gravity separator to perform gravity separation on the overflow product B. During this separation process, the centrifugal acceleration is 80-90G, the feed concentration is 25%-30%, and the flushing water flow rate is 18m. 3 / h~25m 3 / h.

[0050] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (4.2) in which a mud shaking table is used to perform a single shaking table cleaning of gravity concentrate C; during the single shaking table cleaning process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%.

[0051] The above-mentioned method for the comprehensive recovery of associated tungsten and tin in lithium mica ore is further improved by step (4.3) in which a ore slime shaking table is used to perform secondary shaking table refining on the ore K3 in the shaking table refining process; during the secondary shaking table refining process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%.

[0052] The above-mentioned method for the comprehensive recovery of associated tungsten and tin in lithium mica ore is further improved by step (5.2) using a high-gradient magnetic separator to perform strong magnetic separation of tungsten and tin concentrate mixture; during the strong magnetic separation process, the magnetic field strength is 0.8T to 1.2T and the pulse frequency is 180 times / min to 240 times / min.

[0053] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (5.3) in which a ball mill is used to grind the non-magnetic product to a fineness of -325 mesh, accounting for 85% to 90%; during the grinding process, the grinding concentration is 66% to 70%.

[0054] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (5.4) in which a slurry shaking table is used to clean the slurry after grinding. During the shaking table cleaning process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%. The tailings K4 from the shaking table cleaning process are mixed with the overflow product B and then subjected to further gravity separation.

[0055] The above-mentioned method for the comprehensive recovery of associated tungsten and tin from lithium mica ore is further improved by step (6.2) in which a high-gradient magnetic separator is used to sequentially perform two strong magnetic roughing separations, one strong magnetic cleaning separation, and three strong magnetic sweeping separations on the lithium mica ore mixture to complete the strong magnetic separation of the lithium mica ore mixture; in the first strong magnetic roughing separation process, the magnetic field strength is 1.5T to 1.75T, the pulse frequency is 200 times / min to 250 times / min, and the feed concentration is 25% to 35%.

[0056] Compared with the prior art, the advantages of the present invention are as follows:

[0057] (1) In view of the defects in the existing mineral processing technology, such as serious loss of coarse and fine particles, low grade and low recovery rate of tin / tungsten concentrate, and low grade and low recovery rate of lithium concentrate, this invention creatively proposes a method for comprehensive recovery of associated tungsten and tin in lithium iron ore. Combining the actual situation of ore grinding and the distribution characteristics of tungsten and tin ore, the lithium iron ore raw material is first crushed and screened to obtain coarse products on the screen and undersize products. The oversize products are returned to crushing and further crushing, and the undersize products are subjected to the next stage of grinding and classification. The grinding products and classification products are separated by gravity separation to obtain tungsten and tin concentrate. The tungsten and tin concentrate is then separated by magnetic separation to obtain tungsten concentrate and tin concentrate. The gravity separation tailings are subjected to strong magnetic separation to obtain lithium iron ore concentrate. Compared with conventional sorting methods, the method of this invention can achieve early and comprehensive recovery, and has the advantages of being clean and non-toxic, having a reasonable process, high recovery efficiency, low loss of coarse and fine metal particles, and high sorting efficiency. It can also comprehensively recover lithium concentrate with high Li2O grade and high recovery rate, as well as the comprehensive recovery of associated valuable elements. It is a new mineral processing technology with good sorting effect, economy and environmental protection, and can efficiently recover tungsten and tin resources from low-grade lithium iron ore. It has high use value and good application prospects.

[0058] (2) Compared with conventional classification and separation methods, the method of the present invention has the following advantages: (a) the grinding product has a coarser particle size, which reduces the generation of fine-grained minerals and alleviates over-grinding of tungsten and tin; (b) the coarse-grained heavy minerals that have been liberated from their monomers can be recovered early, improving separation efficiency and reducing metal loss; (c) further recovery of the ore in the shaking table can improve the recovery rate of tungsten and tin. Specifically, compared with conventional classification and separation methods, in the method of the present invention, the recovery rate of lithium is increased by about 4.6 percentage points; the grade of tungsten is increased by about 1 time; the grade of tin is increased by about 5.98 percentage points, and the recovery rate of tin is increased by about 8.03 percentage points; the loss of fine-grained lithium metal is reduced by about 2.79 percentage points; and the loss of fine-grained tin metal is reduced by about 4.21 percentage points.

[0059] (3) In this invention, a sieve with a pore size of 2 mm is used to screen the product after grinding, which can improve the degree of liberation of useful minerals and improve the separation effect. It can also reduce the over-grinding phenomenon of tungsten-tin minerals and improve the recovery rate of tungsten-tin minerals. This is because if the pore size is greater than 2 mm, the particle size of the undersize product B will be too coarse and the degree of liberation of useful minerals will be low, which is not conducive to separation. If the pore size is less than 2 mm, the tungsten-tin minerals in the undersize product B will be over-grinded and difficult to recover after re-separation.

[0060] (4) In this invention, by adjusting the slurry concentration of the undersize product B to ≤60%, and in particular, adjusting the slurry concentration of the undersize product B to 30% to 60%, it is beneficial to improve the separation effect of heavy minerals and light minerals, and thus to improve the sorting effect. This is because when the slurry concentration exceeds 60%, heavy minerals and light minerals cannot be effectively separated, and the sorting effect is poor; while when the concentration is too low, due to the large amount of water, the processing capacity of the gravity separation equipment is poor, which is not conducive to improving the sorting efficiency. Attached Figure Description

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0062] Figure 1 This is a schematic diagram of the process flow for the comprehensive recovery of associated tungsten and tin from lithium mica ore in Embodiment 1 of the present invention. Detailed Implementation

[0063] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.

[0064] In this embodiment of the invention, the lithium mica ore (raw ore) used is a lithium polymetallic mine in Hunan Province. The main useful minerals in the raw ore are lithium mica, wolframite, and cassiterite, while the gangue minerals are quartz and feldspar. The raw ore contains 0.351% Li2O, 0.019% WO3, and 0.047% Sn by mass.

[0065] Example 1

[0066] A method for the comprehensive recovery of associated tungsten and tin from lithium mica ore involves the comprehensive recovery of lithium mica concentrate, tungsten concentrate, and tin concentrate from lithium mica ore (raw ore). The process flow diagram is shown below. Figure 1 As shown, it includes the following steps:

[0067] S1. Crushing and screening the lithium mica ore raw material: feeding the lithium mica ore (raw ore) into the crusher and crushing it to a particle size of 8mm; feeding the crushed product into the screening machine for screening to obtain coarse product A on the upper screen and product A on the lower screen. The coarse product A on the upper screen is returned to the crusher, mixed with the lithium mica ore (raw ore) and crushed again, while product A on the lower screen enters the next stage of operation.

[0068] S2. Grind the undersize product A using a 2mm sieve. Specifically, feed the undersize product A into a ball mill for grinding. After ball milling, the discharge is separated into coarse particles (B) with a particle size > 2mm. This coarse particle is returned to the ball mill and mixed with the undersize product A before further ball milling. The fine particles are the undersize product B with a particle size ≤ 2mm, which then proceed to the next stage of operation.

[0069] S3. Adjust the slurry concentration of undersize product B to 50%, and perform Nelson gravity separation on undersize product B. Specifically, dilute the slurry concentration of undersize product B (-2mm particle size) to 50%, and perform Nelson gravity separation A on the diluted undersize product B using a Nelson gravity separator. The centrifugal acceleration during the Nelson gravity separation process is 100G, and the washing water flow is 20m. 3 / h, respectively, yielding gravity concentrate A and gravity tailings A. Appropriately increasing the particle size of the Nelson gravity separator is beneficial for the recovery of heavy minerals.

[0070] In step S3, the subsequent processing of the obtained gravity concentrate A includes the following steps:

[0071] (1.1) The gravity concentrate A is subjected to a shaking table cleaning process. Specifically, the gravity concentrate A obtained in step S3 is fed into a 6-S coarse sand shaking table for a cleaning process. During the 6-S coarse sand shaking table cleaning process, the stroke is 25mm, the stroke is 240 times / min, and the feed concentration is 30%. The resulting tungsten-tin concentrate K1, shaking table cleaning middlings K1, and shaking table cleaning tailings K1 are obtained.

[0072] (1.2) The middlings K1 from the shaking table concentrate is subjected to secondary shaking table concentrate. The secondary shaking table concentrate operation adopts a 6-S coarse sand shaking table. During the secondary shaking table concentrate operation, the stroke is 25mm, the stroke is 240 times / min, and the feed concentration is 30%, resulting in tungsten-tin concentrate K1 and shaking table concentrate tailings K1.

[0073] In step S3, the subsequent processing of the obtained gravity separation tailings A includes the following steps:

[0074] (2.1) The gravity separation tailings A are classified by high frequency screening. The high frequency screening operation uses a high frequency screening machine with a screen size of 0.15 mm and a feed concentration of 30%, to obtain coarse product A and fine product A.

[0075] (2.2) The fine-particle product A is classified by hydrocyclone. Specifically, the fine-particle product A obtained in step (2.1) is fed into an FX-150 hydrocyclone for classification. The feed concentration is 20% and the feed pressure is 0.1-0.12 MPa. The resulting sediment product B and overflow product B are obtained. The sediment product B has a particle size >45 μm, and the overflow product B has a particle size of -45 μm, accounting for 80%.

[0076] In step (2.2), the subsequent processing of the obtained sediment product B includes the following steps:

[0077] (3.1) The grit product B is subjected to gravity separation, specifically: the grit B obtained in step (2.2) is fed into a Nelson concentrator for Nelson gravity separation, wherein the centrifugal acceleration during Nelson gravity separation is 100G, the feed concentration is 30%, and the wash water flow rate is 20m. 3 / h, yielding gravity concentrate B and gravity tailings B.

[0078] (3.2) Perform a shaking table cleaning process on the gravity concentrate B. Specifically, the gravity concentrate B obtained in step (3.1) is fed into a 6-S fine sand shaking table for a single cleaning process. During the 6-S fine sand shaking table cleaning process, the stroke is 15 mm, the stroke is 275 times / min, and the feed concentration is 25%. The resulting tungsten-tin concentrate K2, shaking table cleaning middlings K2, and shaking table cleaning tailings K2 are obtained.

[0079] (3.3) The middlings K2 from the shaking table concentrate were subjected to secondary shaking table concentrate. The secondary shaking table concentrate operation used a 6-S fine sand shaking table. During the secondary shaking table concentrate operation, the stroke was 15mm, the stroke rate was 275 times / min, and the feed concentration was 25%, resulting in tungsten-tin concentrate K2 and tailings K2 from the shaking table concentrate.

[0080] In step (2.2), the subsequent processing of the resulting overflow product B includes the following steps:

[0081] (4.1) The overflow product B is subjected to gravity separation C, specifically: the overflow product B obtained in step (2.2) is fed into a Nelson concentrator for Nelson gravity separation, wherein the centrifugal acceleration is 80G, the feed concentration is 25%, and the flushing water flow rate is 18m. 3 / h, yielding gravity concentrate C and gravity tailings C.

[0082] (4.2) The gravity concentrate C is subjected to a shaking table cleaning process. Specifically, the gravity concentrate C obtained in step (4.1) is fed into a 6-S slime shaking table for a cleaning process. During the 6-S slime shaking table cleaning process, the stroke is 13mm, the stroke is 350 times / min, and the feed concentration is 20%. The resulting tungsten-tin concentrate K3, shaking table cleaning middlings K3, and shaking table cleaning tailings K3 are obtained.

[0083] (4.3) The middlings K3 from the shaking table beneficiation process is subjected to secondary shaking table beneficiation. The secondary shaking table beneficiation operation adopts a 6-S slime shaking table. During the secondary shaking table beneficiation process, the stroke is 13mm, the stroke is 350 times / min, and the feed concentration is 20%, resulting in tungsten-tin concentrate K3 and shaking table beneficiation tailings K3.

[0084] In this embodiment, the subsequent processing of the obtained tungsten-tin concentrates K1, K2, and K3 includes the following steps:

[0085] (5.1) Collect tungsten-tin concentrate K1, tungsten-tin concentrate K2 and tungsten-tin concentrate K3, mix them to obtain a mixture of tungsten-tin concentrate materials.

[0086] (5.2) Tungsten-tin concentrate mixture is subjected to tungsten-tin strong magnetic separation, specifically: the tungsten-tin concentrate mixture obtained in step (5.1) is fed into a high gradient magnetic separator for tungsten-tin strong magnetic separation. During the tungsten-tin strong magnetic separation process, the magnetic field strength is 1.1T and the pulsation frequency is 200 times / min, to obtain tungsten concentrate (magnetic product) and non-magnetic product.

[0087] (5.3) The non-magnetic product was ground using a ball mill with a grinding concentration of 70% until the grinding fineness was -325 mesh, accounting for 85%.

[0088] (5.4) The slurry after grinding is subjected to shaking table refining, specifically: the grinding product obtained in (5.3) is fed into a 6-S slime shaking table for refining, wherein the stroke of the 6-S slime shaking table is 13mm, the stroke is 350 times / min, the feed concentration is 20%, and tin concentrate and shaking table refining tailings K4 are obtained. The shaking table refining tailings K4 are returned to step (4.1), mixed with the overflow product B, and then re-separated.

[0089] In this embodiment, the subsequent processing of the obtained gravity separation tailings B, gravity separation tailings C, shaking table-refined tailings K2, and shaking table-refined tailings K3 includes the following steps:

[0090] (6.1) Collect gravity separation tailings B, gravity separation tailings C, shaking table refined tailings K2, and shaking table refined tailings K3, mix them, and obtain a mixture of lithium iron ore and mica ore.

[0091] (6.2) The mixture of lithium iron ore and mica is subjected to strong magnetic separation. Specifically, the mixture of lithium iron ore and mica obtained in step (6.1) is fed into a high gradient magnetic separator and subjected to two strong magnetic roughing separations, one strong magnetic cleaning separation, and three strong magnetic sweeping separations in sequence to obtain lithium iron ore concentrate and tailings. In the first strong magnetic roughing separation process, the magnetic field strength is 1.75T, the pulse frequency is 200 times / min, and the feed concentration is 30%.

[0092] In this embodiment, the subsequent processing of the obtained shaker-refined tailings K1 and coarse-grained product A includes the following steps:

[0093] (7.1) Collect tailings K1 and coarse product A by shaking table beneficiation.

[0094] (7.2) The tailings K1 selected by the shaking table and the coarse product A are returned to the ball mill in step S2, and then mixed with the undersize product A and ground.

[0095] Following the above process, lithium iron ore (raw ore) was recovered multiple times, and the average recovery results are shown in Table 1.

[0096] As shown in Table 1, in Example 1, after treatment by the method of the present invention, the Li2O grade in the resulting lithium mica concentrate increased to 1.915%, and the Li2O recovery rate increased to 85%; the WO3 grade in the tungsten concentrate increased to 12.72%, and the WO3 recovery rate increased to 53.56%; and the Sn grade in the tin concentrate increased to 44.65%, and the Sn recovery rate increased to 57%. It is evident that the method of the present invention can comprehensively recover tungsten and tin from lithium mica ore, and the content of inter-elements among lithium mica concentrate, tungsten concentrate, and tin concentrate is low, enabling effective recovery of lithium, tungsten, and tin resources. This has broad practical significance for improving the comprehensive utilization rate of lithium mica ore resources and increasing product added value.

[0097] Table 1. Test results in Example 1

[0098]

[0099]

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A method for the comprehensive recovery of associated tungsten and tin from lithium mica ore, characterized in that, Includes the following steps: S1. Crushing and screening the lithium mica ore raw material to obtain coarse product A on the screen and product A below the screen. S2. Grind and screen the undersize product A to obtain the coarse oversize product B and the undersize product B. S3. Adjust the slurry concentration of the undersize product B to ≤60%, and perform gravity separation on the undersize product B to obtain gravity concentrate A and gravity tailings A; The subsequent processing of the gravity concentrate A includes the following steps: (1.1) The gravity concentrate A is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K1, shaking table middlings K1 and shaking table tailings K1; (1.2) The middlings K1 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K1 and tailings K1 from the shaking table concentrate; The subsequent processing of the gravity separation tailings A includes the following steps: (2.1) The gravity separation tailings A are subjected to high-frequency screening to obtain coarse product A and fine product A; (2.2) The fine-particle product A is classified by hydrocyclone to obtain the sediment product B and the overflow product B; The subsequent processing of the sediment product B includes the following steps: (3.1) The sediment product B is subjected to gravity separation to obtain gravity concentrate B and gravity tailings B; (3.2) The gravity concentrate B is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K2, shaking table middlings K2 and shaking table tailings K2; (3.3) The middlings K2 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K2 and tailings K2 from the shaking table concentrate; The subsequent processing of the overflow product B includes the following steps: (4.1) The overflow product B is subjected to gravity separation to obtain gravity concentrate C and gravity tailings C; (4.2) The gravity concentrate C is subjected to a shaking table cleaning process to obtain tungsten-tin concentrate K3, shaking table middlings K3 and shaking table tailings K3; (4.3) The middlings K3 from the shaking table concentrate is subjected to a second shaking table concentrate to obtain tungsten-tin concentrate K3 and tailings K3 from the shaking table concentrate; The subsequent processing of the tungsten-tin concentrates K1, K2, and K3 includes the following steps: (5.1) Collect tungsten-tin concentrate K1, tungsten-tin concentrate K2 and tungsten-tin concentrate K3, mix them to obtain a mixture of tungsten-tin concentrates; (5.2) The mixture of tungsten and tin concentrates is subjected to strong magnetic separation to obtain tungsten concentrate and non-magnetic products; (5.3) Grinding non-magnetic products; (5.4) The slurry after grinding is subjected to shaking table cleaning to obtain tin concentrate and shaking table cleaning tailings K4; The subsequent processing of gravity separation tailings B, gravity separation tailings C, shaking table-refined tailings K2, and shaking table-refined tailings K3 includes the following steps: (6.1) Collect gravity separation tailings B, gravity separation tailings C, shaking table refined tailings K2, and shaking table refined tailings K3, mix them, and obtain a mixture of lithium iron ore and mica ore. (6.2) Strong magnetic separation is performed on the mixture of lithium iron ore and mica to obtain lithium iron ore concentrate and tailings.

2. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to claim 1, characterized in that, In step S1, the particle size of the lithium iron ore raw material is crushed to below 8mm; after the coarse product A on the sieve is mixed with the lithium iron ore raw material, crushing continues.

3. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to claim 1, characterized in that, In step S2, a ball mill is used to grind the undersize product A; a sieve with a 2mm aperture is used to screen the ground product; the particle size of the oversize coarse product B is >2mm; the oversize coarse product B and the undersize product A are mixed and then ground again.

4. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to claim 1, characterized in that, In step S3, the slurry concentration of the undersize product B is adjusted to 30%–60%; a gravity separation roughing device is used to perform gravity separation on the undersize product B; the gravity separation roughing device is a Nelson gravity separator or a spiral chute; when using the Nelson gravity separator to perform gravity separation on the undersize product B, the centrifugal acceleration is 90G–100G and the washing water flow rate is 20m. 3 / h~30m 3 / h.

5. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to claim 1, characterized in that, The subsequent processing of the tailings K1 and coarse product A obtained by the shaking table includes the following steps: (7.1) Collect tailings K1 and coarse product A by shaking table beneficiation; (7.2) The tailings K1 selected by the shaking table, the coarse product A and the screened product A are mixed and ground.

6. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to any one of claims 1 to 5, characterized in that, In step (1.1), a coarse sand shaking table is used to perform a single shaking table cleaning of gravity concentrate A; during the single shaking table cleaning process, the stroke is 20mm to 30mm, the stroke rate is 230 to 250 times / min, and the feed concentration is 25% to 35%. In step (1.2), a coarse sand shaking table is used to perform secondary shaking table refining on the middlings K1 from the shaking table refining process; during the secondary shaking table refining process, the stroke is 20mm to 30mm, the stroke rate is 230 to 250 times / min, and the feed concentration is 25% to 35%.

7. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to any one of claims 1 to 5, characterized in that, In step (2.1), a high-frequency screening machine is used to classify the gravity separation tailings A; during the high-frequency screening process, the aperture of the screen is 0.15 mm and the feed concentration is 25% to 35%. In step (2.2), a hydrocyclone is used to classify the fine-particle product A; during the hydrocyclone classification process, the feed concentration is 18% to 25% and the feed pressure is 0.1 MPa to 0.12 MPa; the overflow product B has a particle size of -45 μm accounting for 80% to 85%.

8. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to any one of claims 1 to 5, characterized in that, In step (3.1), a gravity separation coarsening device is used to perform gravity separation on the sand product B; the gravity separation coarsening device is either a Nelson gravity separator or a spiral chute; when the Nelson gravity separator is used to perform gravity separation on the sand product B, the centrifugal acceleration is 90G~100G, the feed concentration is 30%~35%, and the flushing water flow rate is 20m. 3 / h~30m 3 / h; In step (3.2), a fine sand shaking table is used to perform a single shaking table cleaning of gravity concentrate B; during the single shaking table cleaning process, the stroke is 15mm to 20mm, the number of strokes is 250 to 275 times / min, and the feed concentration is 25% to 30%. In step (3.3), a fine sand shaking table is used to perform secondary shaking table refining on the middlings K2 from the shaking table refining process; during the secondary shaking table refining process, the stroke is 15mm to 20mm, the stroke rate is 250 to 275 times / min, and the feed concentration is 25% to 30%.

9. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to any one of claims 1 to 5, characterized in that, In step (4.1), a gravity separation coarsening device is used to perform gravity separation on the overflow product B; the gravity separation coarsening device is either a Nelson gravity separator or a spiral chute; when the Nelson gravity separator is used to perform gravity separation on the overflow product B, the centrifugal acceleration is 80G~90G, the feed concentration is 25%~30%, and the flushing water flow rate is 18m. 3 / h~25m 3 / h; In step (4.2), a shaking table is used to perform a single shaking table cleaning of gravity concentrate C; during the single shaking table cleaning process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%. In step (4.3), a secondary shaking table is used to clean the K3 middlings from the shaking table. During the secondary shaking table cleaning process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%.

10. The method for comprehensive recovery of associated tungsten and tin from lithium mica ore according to any one of claims 1 to 5, characterized in that, In step (5.2), a high-gradient magnetic separator is used to perform tungsten-tin strong magnetic separation on the tungsten-tin concentrate mixture; during the tungsten-tin strong magnetic separation process, the magnetic field strength is 0.8T to 1.2T, and the pulse frequency is 180 times / min to 240 times / min; In step (5.3), a ball mill is used to grind the non-magnetic product until the grinding fineness is -325 mesh, accounting for 85% to 90%; during the grinding process, the grinding concentration is 66% to 70%. In step (5.4), a shaking table is used to clean the slurry after grinding; during the shaking table cleaning process, the stroke is 13mm to 18mm, the stroke rate is 320 to 360 times / min, and the feed concentration is 20% to 25%; after the tailings K4 from the shaking table cleaning process is mixed with the overflow product B, gravity separation is continued. In step (6.2), a high-gradient magnetic separator is used to sequentially perform two strong magnetic roughing separations, one strong magnetic cleaning separation, and three strong magnetic sweeping separations on the iron-lithium mica ore mixture to complete the strong magnetic separation of the iron-lithium mica ore mixture; during the first strong magnetic roughing separation process, the magnetic field strength is 1.5T to 1.75T, the pulsation frequency is 200 times / min to 250 times / min, and the feed concentration is 25% to 35%.

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