Method for recovering tantalum and tin from lepidolite ore

Abstract

The invention provides a method for recovering tantalum and tin from lepidolite ore, and relates to the technical field of ore dressing. A method for recycling tantalum and tin from lepidolite ore comprises the following steps that S1, roughing is conducted, specifically, the lepidolite ore and water are mixed to obtain ore pulp, an inhibitor, sodium carbonate and a collecting agent are added, the materials are stirred to be uniform, and tantalum and tin rough concentrate and feldspar powder are obtained after flotation; s2, grading and gravity separation are conducted, specifically, the tantalum-tin rough concentrate is graded, underflow and overflow are obtained, the underflow enters a shaking table for gravity separation, and tantalum-tin concentrate and shaking table tailings are obtained; and S3, flotation is conducted, specifically, table tailings are subjected to ore grinding, mixed minerals obtained through overflow in S2 are added, flotation is conducted on the mixed minerals, and tantalum-tin concentrate is obtained. According to the flotation-reselection-flotation combined beneficiation method, the defect that the tantalum and tin recovery rate is low in an existing method is overcome.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a method for recovering tantalum and tin from lithium mica ore. Background Art

[0002] Yichun, Jiangxi Province is the lithium capital. Lepidolite is the most common lithium mineral. Tantalum, niobium and tin minerals are also associated with lepidolite. Due to its low grade, the industry currently uses a variety of mineral processing methods such as chute + shaking table, magnetic separation + gravity separation, mixed flotation + gravity separation, etc. Because lepidolite is the main recovered mineral, its monomer dissociation degree is relatively coarse, while the monomer dissociation degree of tantalum, niobium and tin minerals has a large range and is difficult to balance. Therefore, after selecting lepidolite, it should be recycled with a reasonable process flow based on the concept of early recovery. Among them, chute + shaking table recycling, although the operating cost is low, but the fine-grained tantalum and tin and the intergrowth tantalum and tin cannot be recovered, and the recovery rate of tantalum + tin is ≤30%. Magnetic separation + gravity separation recovery, although the recovery effect of tantalum is slightly increased, but tin is not magnetic, resulting in the failure of effective recovery of tin metal, reducing the economic value by 50%. Mixed flotation + gravity separation is used for recovery. Because the flotation of three kinds of minerals needs to be taken into account, the subsequent quality improvement depends entirely on the gravity separation process, resulting in poor recovery of fine particles and intergrowths. This method is better than the previous two methods, but it still does not solve the recovery and quality problems of fine particles and intergrowths of tantalum and tin minerals. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a method for recovering tantalum and tin from lithium mica ore.

[0004] A method for recovering tantalum and tin from lithium mica ore proposed by the present invention comprises the following steps:

[0005] S1, roughing: mix the lepidolite ore with water to obtain slurry, add inhibitor, sodium carbonate, collector, stir evenly, and obtain tantalum-tin rough concentrate and feldspar powder after flotation;

[0006] S2, classification and gravity separation: the rough tantalum-tin concentrate is classified to obtain underflow and overflow, and the underflow enters the shaking table for gravity separation to obtain tantalum-tin concentrate and shaking table tailings;

[0007] S3, flotation: grinding the shaking table tailings, adding the overflow described in S2 to obtain mixed minerals, and flotating the mixed minerals to obtain tantalum-tin concentrate.

[0008] The present invention utilizes the characteristics of tantalum-tin minerals and adopts a combined process of roughing-grading re-selection-flotation to solve the recovery of fine-grained and intergrown tantalum-tin minerals and increase the recovery of tantalum-tin minerals. The ore dressing method of the present invention recovers a mixed tantalum-tin concentrate with a tantalum grade of 3% and a tin grade of 68% from lithium mica tailings with a tantalum grade of 0.0025%-0.0032% and a tin grade of 0.06%-0.08%, providing a practical way for the tantalum-tin separation process, realizing the comprehensive utilization of tantalum-tin resources, increasing enterprise benefits, reducing operating costs, reducing tailings emissions, and effectively promoting energy conservation and emission reduction.

[0009] Preferably, in S1, the lepidolite ore is tailings after recycling lepidolite, and the -75 μm content in the tailings is 28-35%.

[0010] Preferably, in said S1, the slurry concentration is 30-40%.

[0011] Controlling the slurry concentration within a certain range helps save reagent costs and improve sorting efficiency.

[0012] Preferably, the inhibitor is water glass.

[0013] Preferably, in the S1, the added amount of the inhibitor is 300-800 g / t.

[0014] Adding an inhibitor within a certain range can help improve the selectivity of the collector for tantalum and tin, while reducing the floatability of feldspar and quartz.

[0015] Preferably, in S1, sodium carbonate is added to adjust the pH to 8-9.

[0016] Preferably, the collector is a tantalum-tin collector, and the collector raw materials include fatty acids and oxime acids, and the mass ratio of the fatty acids to the oxime acids is (2-4):1.

[0017] Preferably, in S1, the preparation method of the collector comprises the following steps: adding oxime acid to fatty acid and mixing them evenly to obtain the collector.

[0018] More preferably, the fatty acid is selected from one or more of oleic acid, linoleic acid and linolenic acid.

[0019] More preferably, the oxime acid is selected from one or more of benzohydroxamic acid and 1-hydroxy-2-naphthohydroxamic acid.

[0020] Preferably, in said S1, the added amount of the collector is 500-1000 g / t.

[0021] The fatty acids and oxime acids in the collector have multiple functional groups, which help to improve the collection capacity. Controlling the amount of collector added within a certain range helps to obtain the best yield and grade of tantalum-tin concentrate while controlling production costs.

[0022] Preferably, in S2, cyclone classification is used for classification, and the classification particle size is 70-80 μm.

[0023] The purpose of classification is to prevent over-grinding of tantalum and tin, while particle size control simplifies subsequent recycling.

[0024] More preferably, in the S2, the particle size of the underflow is greater than 75 μm; and the particle size of the overflow is less than 75 μm.

[0025] Preferably, in S2, the shaking table is a sludge shaking table.

[0026] Preferably, in S3, the particle size after grinding is less than 75 μm.

[0027] Preferably, in S3, flotation includes one roughing selection, one scavenging selection and three cleaning selections.

[0028] More preferably, in said S3, the roughing comprises: adding an inhibitor, sodium carbonate and a collector to the mixed minerals, stirring sufficiently and then starting aeration and foaming to obtain a roughing foam product and a rough tailing product.

[0029] The role of roughing is to initially enrich tantalum and tin and recover as much tantalum and tin as possible from the ore, thus ensuring the improvement of the grade of tantalum and tin concentrate for subsequent concentration operations.

[0030] More preferably, in the roughing process, the amount of the collector added is 200-500 g / t, the amount of the inhibitor added is 200-500 g / t, and sodium carbonate is added to adjust the pH to 8-9.

[0031] Controlling the amount of collector added in a certain range in roughing helps control the cost of reagents and improve selectivity. Controlling the amount of inhibitor added in a certain range helps suppress gangue and improve sorting. Controlling pH in a certain range helps to maximize the performance of the collector.

[0032] More preferably, in said S3, scavenging comprises: adding a collector to the rough tailing product after roughing, stirring sufficiently and then starting aeration and foaming to obtain scavenging foam products and tailings.

[0033] The purpose of scavenging is to recover tantalum and tin metal as much as possible.

[0034] More preferably, the scavenged foam product enters the previous step for rough selection to form a closed circuit.

[0035] More preferably, the amount of collector added during the scanning is 100-200 g / t.

[0036] More preferably, in the S3, the three concentrations include concentration one, concentration two and concentration three; wherein concentration one includes: adding an inhibitor to the roughing foam product, stirring sufficiently and starting to aerate and scrape the foam to obtain a concentration one foam product and a concentration one tailings product; concentration two includes: feeding the concentration one foam product into the concentration two flotation operation, stirring sufficiently and starting to aerate and scrape the foam to obtain a concentration two foam product and a concentration two tailings product; concentration three includes: feeding the concentration two foam product into the concentration three flotation operation, stirring sufficiently and starting to aerate and scrape the foam to obtain tantalum-tin concentrate and concentration three tailings.

[0037] The purpose of tertiary concentration is to improve the quality of concentrate.

[0038] More preferably, the amount of the inhibitor added in the concentrate is 50-100 g / t.

[0039] Controlling the amount of inhibitor added in concentrate within a certain range is helpful to control the quality of the concentrate.

[0040] The beneficial effects of the present invention are:

[0041] The invention provides a beneficiation method for comprehensively recovering tantalum and tin from lepidolite ore. According to the mineral properties of tantalum and tin, tailings after flotation recovery of lepidolite are firstly enriched with tantalum and tin to obtain a rough tantalum and tin concentrate. The rough tantalum and tin concentrate is classified by a cyclone. The bottom flow of the cyclone enters a shaking table to obtain partially rough qualified tantalum and tin concentrate. The tailings in the shaking table are concentrated and enter a ball mill. The ball mill discharge enters a cyclone for classification again to form a closed circuit. The overflow of the cyclone is flotated to obtain a fine qualified tantalum and tin concentrate. The defect of low recovery rate of existing tantalum and tin is successfully solved by a combined beneficiation method of flotation-gravity selection-flotation.

[0042] The conventional waterfall chute process is prone to losing 60% of the tantalum-tin metal; the present invention adopts flotation to preferentially enrich tantalum-tin to prevent the loss of tantalum-tin; and then obtains part of the qualified tantalum-tin concentrate by classifying the coarse particles on a shaking table, so that the tantalum-tin can be collected as early as possible to prevent over-grinding of the tantalum-tin that is not conducive to subsequent recovery; the medium ore is re-grinded to further promote the dissociation of tantalum-tin monomers, and the fine particle level is then subjected to flotation to obtain qualified fine-grained tantalum-tin concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a process flow chart of the method for recovering tantalum and tin from lithium mica ore proposed by the present invention. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is described in detail through specific embodiments.

[0045] Unless otherwise specified, the materials, reagents, etc. used in the following examples and comparative examples can be obtained from commercial sources.

[0046] Example 1

[0047] The lithium mica ore is the tailings after lithium mica is recovered in Yifeng, Jiangxi Province. The main gangues are quartz, feldspar, etc. The tantalum grade of the original ore is 0.0025%, the tin grade is 0.06%, and the -75μm content is 28~35%.

[0048] The preparation method of collector YC-106 comprises: firstly adding 3 parts by weight of fatty acid and then adding 1 part by weight of oxime acid, and mixing them evenly.

[0049] A method for recovering tantalum and tin from lithium mica ore comprises the following steps:

[0050] S1, roughing: mix the lithium mica ore with water to obtain a slurry with a concentration of 35%, add 500g / t of water glass inhibitor, add sodium carbonate to adjust the pH to 9, stir well for 3 minutes, then add 600g / t of collector YC-106, stir well for 3 minutes, start aeration and scraping, and obtain tantalum-tin rough concentrate and feldspar powder;

[0051] S2, classification and gravity separation: the tantalum-tin rough concentrate is classified into +75μm product and -75μm product, and the +75μm product enters the shaking table for gravity separation to obtain tantalum-tin concentrate and shaking table tailings;

[0052] S3, flotation: The shaker tailings are concentrated and ground for 2 minutes to classify the -75μm product, and the -75μm product described in S2 is added to obtain mixed minerals. The mixed minerals are added to a mechanical stirring flotation machine, 200g / t water glass inhibitor is added, sodium carbonate is added to adjust the pH to 8, and collector YC-106 is added 500g / tAfter sufficient stirring, start aeration and scraping foam to obtain roughing foam products and rough tailings products; scavenging: add YC-106200g / t to the rough tailings product, stir sufficiently, start aeration and scraping foam, and obtain scavenging foam products and tailings; Refining One: feed the roughing foam product into the first selection operation, add 100g / t of water glass inhibitor, stir sufficiently, start aeration and scraping foam, and obtain refined one foam product and refined one tailings product; Refining Two: feed the refined one foam product into the second selection flotation operation, stir sufficiently, start aeration and scraping foam, and obtain refined two foam products and refined two tailings products; Refining Three: feed the refined two foam product into the third selection flotation operation, stir sufficiently, start aeration and scraping foam, and obtain tantalum-tin concentrate and refined three tailings products, and return from the middling stage to form a closed circuit.

[0053] The tantalum grade of the original ore is 0.0025%, and the tin grade is 0.06%; the tantalum grade of the tantalum-tin concentrate is 3.12%, and the tin grade is 68.32%; the tantalum grade of the refined tailings product is 0.0006%, and the tin grade is 0.0184%; the tantalum recovery rate is 76%, and the tin recovery rate is 69%.

[0054] Example 2

[0055] The lithium mica ore is the tailings after lithium mica is recovered in Yifeng, Jiangxi Province. The gangue mainly includes quartz, feldspar, etc. The tantalum grade of the original ore is 0.0032%, the tin grade is 0.08%, and the -75μm content is 28~35%.

[0056] The preparation method of collector YC-106 comprises: firstly adding 3 parts by weight of fatty acid and then adding 1 part by weight of oxime acid, and mixing them evenly.

[0057] A method for recovering tantalum and tin from lithium mica ore comprises the following steps:

[0058] S1, roughing: mix the lithium mica ore with water to obtain a slurry with a concentration of 35%, add 800g / t of water glass inhibitor, add sodium carbonate to adjust the pH to 8, stir well for 3 minutes, then add 1000g / t of collector YC-106, stir well for 3 minutes, start aeration and scraping, and obtain tantalum tin rough concentrate and feldspar powder;

[0059] S2, classification and gravity separation: the tantalum-tin rough concentrate is classified into +75μm product and -75μm product, and the +75μm product enters the shaking table for gravity separation to obtain tantalum-tin concentrate and shaking table tailings;

[0060] S3, flotation: The shaker tailings are concentrated and ground for 2 minutes to classify the -75μm product, and the -75μm product described in S2 is added to obtain mixed minerals. The mixed minerals are added to a mechanical stirring flotation machine, 200g / t water glass inhibitor is added, sodium carbonate is added to adjust the pH to 8, and collector YC-106 is added 300g / t, after sufficient stirring, start aeration and scraping foam to obtain roughing foam products and rough tailings products; scavenging: add YC-106100g / t to the rough tailings product, stir sufficiently, start aeration and scraping foam, and obtain scavenging foam products and tailings; Refining 1: feed the roughing foam product into the first selection operation, add 50g / t of water glass inhibitor, stir sufficiently, start aeration and scraping foam, and obtain refined foam products and refined tailings products; Refining 2: feed the refined foam product into the second selection flotation operation, stir sufficiently, start aeration and scraping foam, and obtain refined foam products and refined tailings products; Refining 3: feed the refined foam product into the third selection flotation operation, stir sufficiently, start aeration and scraping foam, and obtain tantalum-tin concentrate and refined tailings products, and return to the intermediate ore stage to form a closed circuit.

[0061] The tantalum grade of the original ore is 0.0032% and the tin grade is 0.08%; the tantalum grade of the tantalum-tin concentrate is 3.5% and the tin grade is 72.16%; the tantalum grade of the refined tailings product is 0.0007% and the tin grade is 0.0284%; the tantalum recovery rate is 78% and the tin recovery rate is 64%.

[0062] Example 3

[0063] The lithium mica ore is the tailings after lithium mica is recovered in Yifeng, Jiangxi Province. The main gangues are quartz, feldspar, etc. The tantalum grade of the original ore is 0.0028%, the tin grade is 0.07%, and the -75μm content is 28-35%.

[0064] The preparation method of collector YC-106 comprises: firstly adding 3 parts by weight of fatty acid and then adding 1 part by weight of oxime acid, and mixing them evenly.

[0065] A method for recovering tantalum and tin from lithium mica ore comprises the following steps:

[0066] S1, roughing: mix the lithium mica ore with water to obtain a slurry with a concentration of 35%, add 600g / t of water glass inhibitor, add sodium carbonate to adjust the pH to 9, stir well for 3 minutes, then add 800g / t of collector YC-106, stir well for 3 minutes, start aeration and scraping, and obtain tantalum tin rough concentrate and feldspar powder;

[0067] S2, classification and gravity separation: the tantalum-tin rough concentrate is classified into +75μm product and -75μm product, and the +75μm product enters the shaking table for gravity separation to obtain tantalum-tin concentrate and shaking table tailings;

[0068] S3, flotation: The shaker tailings are concentrated and ground for 2 minutes to classify the -75μm product, and the -75μm product described in S2 is added to obtain mixed minerals. The mixed minerals are added to a mechanical stirring flotation machine, 200g / t water glass inhibitor is added, sodium carbonate is added to adjust the pH to 8, and collector YC-106 is added 400g / tAfter sufficient stirring, start aeration and scraping foam to obtain roughing foam products and rough tailings products; scavenging: add YC-106150g / t to the rough tailings product and stir sufficiently, then start aeration and scraping foam to obtain scavenging foam products and tailings; Refining One: feed the roughing foam product into the first selection operation, add 75g / t of water glass inhibitor, stir sufficiently, start aeration and scraping foam to obtain refined one foam product and refined one tailings product; Refining Two: feed the refined one foam product into the second selection flotation operation, stir sufficiently, start aeration and scraping foam to obtain refined two foam products and refined two tailings products; Concentration Three: feed the refined two foam product into the third selection flotation operation, stir sufficiently, start aeration and scraping foam to obtain tantalum-tin concentrate and refined three tailings products, and return to the intermediate ore stage to form a closed circuit.

[0069] The tantalum grade of the original ore is 0.0028%, and the tin grade is 0.07%; the tantalum grade of the tantalum-tin concentrate is 3.4%, and the tin grade is 69.54%; the tantalum grade of the refined tailings product is 0.0006%, and the tin grade is 0.0271%; the tantalum recovery rate is 78%, and the tin recovery rate is 61%.

[0070] In summary, the method for recovering tantalum and tin from lepidolite ore provided by the present invention solves the problem of recovering fine-grained and intergrown tantalum and tin minerals, and increases the recovery of tantalum and tin minerals.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for recovering tantalum and tin from lepidolite ore, characterized in that: The following steps are involved: S1. Roughing: Mix the lithium mica ore with water to obtain slurry, add inhibitor, sodium carbonate and collector, stir evenly, and obtain tantalum-tin rough concentrate and feldspar powder after flotation; S2, classification and gravity separation: the tantalum-tin coarse concentrate is classified to obtain underflow and overflow, and the underflow enters the shaking table for gravity separation to obtain tantalum-tin concentrate and shaking table tailings; S3, flotation: grinding the shaking table tailings, adding the overflow described in S2 to obtain mixed minerals, and flotating the mixed minerals to obtain tantalum-tin concentrate.

2. The method according to claim 1, characterized in that The collector is a tantalum-tin collector, and the raw materials of the collector include fatty acid and oxime acid, and the mass ratio of the fatty acid to the oxime acid is (2-4):

1.

3. The method according to claim 1, characterized in that In the S1, the slurry concentration is 30-40%.

4. The method according to claim 1, characterized in that: In the S1, the added amount of the inhibitor is 300-800 g / t; the added amount of the collector is 500-1000 g / t.

5. The method according to claim 1, characterized in that In the above-mentioned S2, cyclone classification is adopted for classification, and the classification particle size is 70-80 μm.

6. The method according to claim 1, characterized in that In the above-mentioned S3, flotation includes one roughing selection, one scavenging selection and three concentrating selections.

7. The method according to claim 6, characterized in that The roughing process comprises: adding inhibitor, sodium carbonate and collector to the mixed minerals, stirring them fully and then starting aeration and foaming to obtain roughing foam products and rough tail products.

8. The method according to claim 7, characterized in that The added amount of the collector is 200-500 g / t, and the added amount of the inhibitor is 200-500 g / t.

9. The method according to claim 6, characterized in that The scavenging process comprises: adding a collector to the rough tailing product after rough selection, stirring sufficiently and then starting aeration and foaming to obtain scavenging foam products and tailings; the adding amount of the collector is 100-200g / t.

10. The method according to claim 6, characterized in that The three concentrations include concentration one, concentration two and concentration three; wherein concentration one includes: adding an inhibitor to the roughing foam product, stirring sufficiently and then starting to aerate and scrape the foam to obtain a concentration one foam product and a concentration one tailings product; concentration two includes: feeding the concentration one foam product into the concentration two flotation operation, stirring sufficiently and then starting to aerate and scrape the foam to obtain a concentration two foam product and a concentration two tailings product; concentration three includes: feeding the concentration two foam product into the concentration three flotation operation, stirring sufficiently and then starting to aerate and scrape the foam to obtain a tantalum-tin concentrate and a concentration three tailings; the amount of inhibitor added in concentration one is 50-100g / t.

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