Beneficiation method for recovering cassiterite from table tailings at low cost

Abstract

The invention relates to the technical field of mineral processing, in particular to a low-cost beneficiation method for recovering cassiterite from table tailings. According to the method, most of weak-magnetism and fine-fraction gangue minerals and fine silt are removed through strong magnetic separation, cyclone classification and centrifugal gravity separation, a pre-enriched product adopts an adjusting agent formed by compounding tannic acid, aluminum sulfate and water glass, a hydroximic acid collecting agent and an auxiliary collecting agent formed by compounding fusel oil and phosphopolyester, and a magnetism-gravity-flotation combined process is adopted, so that the comprehensive utilization rate of gangue minerals is increased, and the comprehensive utilization rate of gangue minerals is increased. And efficient enrichment and recovery of cassiterite in the table tailings are effectively realized. According to the method, the table tailings are pretreated, the tin flotation treatment capacity and the reagent dosage are reduced, the cassiterite recovery rate and the tin concentrate grade are remarkably improved, and the method has a remarkable effect on recovery of tin ores mainly containing silicate minerals such as tourmaline and mica, so that efficient development and utilization of tin resources are achieved, waste of the tin resources is avoided, and the method is suitable for industrial production. Meanwhile, the tin flotation cost is reduced, and the benefits of a flotation plant are improved.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, in particular to a low-cost ore dressing method for recovering cassiterite from shaking table tailings. Background Art

[0002] Currently, tin metal mainly comes from cassiterite, which has a specific gravity of 6.8g / cm 3 The density of gangue minerals is generally less than 3g / cm 3 , the difference in specific gravity between the two is large, so gravity separation is the main method for cassiterite recovery. At present, the most widely used gravity separation equipment in industry is the shaking table, but the shaking table is suitable for processing products with a particle size of +0.074mm, and the recovery effect of tin below the particle size of -0.038mm is not good. This part of tin often enters the shaking table tailings, and cassiterite is a mineral that is easily crushed after over-grinding, resulting in a high tin loss rate in the shaking table tailings. In order to recover this part of tin as much as possible, flotation recovery is often used, but the flotation feed often has a high fine mud content and poor collector selectivity, resulting in low flotation concentrate grade, low flotation operation recovery rate, high flotation cost and other problems. Many unfavorable factors limit the promotion of cassiterite flotation. When the tin price goes down, the tin flotation income is often less than the cost, and the concentrator can only shut down the flotation system, resulting in a waste of resources.

[0003] When adopting flotation process to recycle tin, due to the interference of reagent selectivity and gangue minerals, some gangue still enters the flotation concentrate, mainly containing iron silicate minerals such as tourmaline, hornblende, and feldspar, so flotation process is difficult to obtain high-grade tin concentrate products (tin grade is about 30%), and only flotation concentrate with tin grade of about 3-10% can be obtained. As Chinese patent application CN112547326A discloses a method for recovering tin metal from low-grade tin old tailings, slurrying of tin old tailings is followed by cyclone classification, after classification, +0.045mm particle size mineral is ground to -0.015mm accounting for 100%, then -0.045mm product after classification is combined with -0.015mm product after grinding for pre-enrichment, enriched concentrate is subjected to flotation decontamination, and water rinsing, demedication, and concentration are added after calcium impurities are removed. However, adopting this method to carry out cassiterite flotation can only obtain a rich medium ore product with a tin grade greater than 5%. This flotation concentrate can only be sold as low-grade tin concentrate, and the sales price of low-grade tin concentrate is only about 1 / 3-1 / 2 of that of high-grade tin concentrate. At present, flotation concentrate with a tin grade lower than 3% (smelting requirements are higher than 3%) is often added to high-grade concentrate by blending, resulting in a loss of tin efficiency. Tin concentrate is generally smelted and processed uniformly in different places. The freight for transporting the same amount of tin metal is 5-10 times that of high-grade tin concentrate, which further weakens the value of tin concentrate and affects the recycling of tin in low-grade tin concentrate.

[0004] Therefore, how to improve the grade of cassiterite flotation concentrate and reduce flotation costs while improving resource utilization so that the benefits obtained by enterprises from tin flotation can fully cope with the tin flotation production pressure brought about by tin price fluctuations is an urgent problem that needs to be solved. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a low-cost beneficiation method for recovering cassiterite from shaking table tailings. The beneficiation method provided by the present invention reduces the tin flotation processing volume and the dosage of reagents by pre-treating the shaking table tailings, significantly improves the cassiterite recovery rate and the grade of tin concentrate, and has a significant effect on the recovery of tin ores mainly composed of silicate minerals such as tourmaline and mica, thereby realizing the efficient development and utilization of tin resources, avoiding the waste of tin resources, and at the same time reducing the tin flotation cost, improving the efficiency of the beneficiation plant, and enabling enterprises to fully cope with the tin flotation production pressure brought about by tin price fluctuations.

[0006] The technical solution of the present invention is:

[0007] A low-cost beneficiation method for recovering cassiterite from shaking table tailings comprises the following steps:

[0008] S1: subject the shaking table tailings to strong magnetic roughing operation to obtain strong magnetic rough concentrate and strong magnetic roughing tailings respectively; subject the strong magnetic rough concentrate to strong magnetic concentration operation to obtain strong magnetic concentration concentrate and strong magnetic concentration tailings respectively; combine the strong magnetic roughing tailings and the strong magnetic concentration tailings to obtain strong magnetic tailings;

[0009] S2: The strong magnetic tailings are classified by cyclone to obtain coarse particle products and fine particle and fine mud products respectively;

[0010] S3: centrifugal gravity separation of fine particles and fine mud products to obtain centrifugal concentrate and centrifugal tailings respectively;

[0011] S4: The centrifugal concentrate and the coarse-grained product are combined and subjected to flotation roughing operation to obtain roughing concentrate and roughing tailings; the roughing concentrate is subjected to concentration 1 operation to obtain concentration 1 concentrate and concentration 1 tailings; the concentration 1 concentrate is subjected to concentration 2 operation to obtain concentration 2 concentrate and concentration 2 tailings; the concentration 2 concentrate is subjected to concentration 3 operation to obtain flotation concentrate and concentration 3 tailings; the roughing tailings are subjected to scavenging operation to obtain scavenging concentrate and flotation tailings; the scavenging concentrate and concentration 1 tailings are returned to the flotation roughing operation, the concentration 2 tailings are returned to the concentration 1 operation, and the concentration 3 tailings are returned to the concentration 2 operation.

[0012] Furthermore, in the step S1, the magnetic field strength of the strong magnetic roughing operation is 1.2T to 1.5T.

[0013] Furthermore, in the step S1, the magnetic field strength of the strong magnetic concentration operation is 1.0T to 1.3T.

[0014] Furthermore, in the step S2, the grading particle size of the cyclone is 10-30 μm, the diameter of the cyclone is 100-150 mm, and the feed pressure of the cyclone is 0.15-0.45 MPa.

[0015] Furthermore, in step S3, the centrifugal equipment used in the centrifugal gravity separation operation is a Falcon centrifuge, the feed concentration is 15-20%, the centrifugal acceleration is 220-280G, and the operating pressure is 120-140PSI.

[0016] Furthermore, the flotation roughing operation in step S4 includes: adding a regulator and stirring for 10-25 minutes; adding a collector and stirring for 10-20 minutes; adding an auxiliary collector and stirring for 10-15 minutes.

[0017] Furthermore, in the step S4, during the selection 1, selection 2 and selection 3 operations, the adjusting agent is added respectively and stirred for 3-10 minutes; during the scanning process, the collecting agent is added and stirred for 10-15 minutes, and the auxiliary collecting agent is added and stirred for 10-15 minutes.

[0018] Furthermore, the dosage of the adjusting agent is 1000-1500 g / t, the dosage of the collecting agent is 300-500 g / t, and the dosage of the auxiliary collecting agent is 40-80 g / t.

[0019] Furthermore, the amount of the adjusting agent added during the selection 1 operation is 400-600g / t; the amount of the adjusting agent added during the selection 2 operation is 200-300g / t; the amount of the adjusting agent added during the selection 3 operation is 200-300g / t; the amount of the collecting agent added during the scanning process is 75-125g / t, and the amount of the auxiliary collecting agent added is 10-20g / t.

[0020] Furthermore, the adjusting agent is prepared from tannic acid, aluminum sulfate and water glass in a mass ratio of 1:2-3:6-9.

[0021] Furthermore, the collector includes 1-hydroxy 2-naphthohydroxamic acid and dihydroxybenzohydroxamic acid compounds.

[0022] Furthermore, the collector is prepared from 1-hydroxy-2-naphthohydroxamic acid and dihydroxybenzohydroxamic acid compounds in a mass ratio of 1:2-3.

[0023] Furthermore, the dihydroxybenzohydroxamic acid compound is 2,3-dihydroxybenzohydroxamic acid or 3,4-dihydroxybenzohydroxamic acid.

[0024] Furthermore, the auxiliary collector is prepared from fusel oil and triester phosphate in a mass ratio of 1:1-2.

[0025] The raw material shaking table tailings treated by the method of the present invention are tailings products obtained after shaking table sorting of vein tin ore whose main gangue minerals are silicate minerals such as quartz, tourmaline, mica, etc.

[0026] The tin grade of the flotation tin concentrate product obtained after being treated by the method of the present invention is greater than 30%.

[0027] The invention provides a low-cost beneficiation method for recovering cassiterite from shaking table tailings. The processing object is the tailings product after the vein tin ore and the main gangue minerals are silicate minerals such as quartz, tourmaline, mica, etc. are sorted by the shaking table. Firstly, the invention utilizes the characteristics that iron-containing silicate minerals such as tourmaline, hornblende and pyroxene have weak magnetism, while cassiterite has no magnetism, and removes most of the magnetic minerals through a high magnetic field; adopts a cyclone to classify the strong magnetic tailings, and obtains coarse-grained products and fine-grained and fine-mud products respectively; the obtained fine-grained and fine-mud products enter a centrifuge, and under the action of a strong centrifugal force, the fine mud and impurity gangue are removed, and the cassiterite is enriched, so as to obtain a centrifugal concentrate with less fine mud content and high tin grade; the obtained centrifugal concentrate and cyclone sedimentation enter a tin flotation operation, and in the tin flotation operation, an adjusting agent compounded with tannic acid, aluminum sulfate and water glass, a hydroxamic acid collector, and an auxiliary collector compounded with fusel oil and triester phosphate are used, and a magnetic-gravity-flotation combined process is adopted, so as to effectively realize the efficient enrichment and recovery of cassiterite in the shaking table tailings, and obtain a tin concentrate with a tin grade greater than 30%.

[0028] The present invention aims at solving the problems of low tin grade, high fine mud content and large processing volume existing in shaking table tailings, which lead to technical difficulties such as low grade of concentrate directly produced by flotation, high reagent cost and high flotation cost. The present invention combines the ore properties of shaking table tailings, pre-discards the tailings before tin flotation, and optimizes the tin flotation feed properties, thereby significantly improving the above technical problems, significantly reducing the cost of tin flotation, making tin flotation more widely used and avoiding waste of resources.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) During the pre-enrichment, the tin flotation feed properties are changed. Through the combination of cyclone + centrifugation, not only the fine cassiterite is recovered and enriched, but also most of the fine mud that affects the flotation of cassiterite is removed;

[0031] (2) It significantly reduces the tin flotation processing volume, improves the tin flotation pulp environment, reduces the amount of tin flotation equipment and flotation reagents used, and significantly reduces the flotation cost;

[0032] (3) The grade of flotation concentrate has been significantly improved. Before the transformation, only 3%-10% of tin could be obtained. After the transformation, 30% of tin can be obtained. The tin grade and value of the concentrate have been greatly increased.

[0033] (4) The new process uses Falcon centrifuge as the centrifugal equipment and high-gradient vertical ring magnetic separator as the strong magnetic separator. Compared with traditional centrifugal and magnetic separation equipment, it has the advantages of strong processing capacity, small footprint, compact equipment, linked operation, etc., and is easy to modify on site.

[0034] (5) The yield of tin concentrate is significantly reduced, which greatly reduces the transportation cost of the concentrate sales process.

[0035] The present invention utilizes the difference in properties between cassiterite and silicate minerals such as tourmaline, hornblende, and pyroxene in the shaking table tailings, and adopts the process flow of "strong magnetic tailings-cyclone classification-centrifugal pre-enrichment-cassiterite flotation", which greatly reduces the tin flotation processing capacity, optimizes the ore properties of the tin flotation feed, improves the flotation slurry environment, reduces the amount of flotation reagents, and obtains a tin concentrate product with a tin grade of more than 30% through flotation, significantly improves the tin concentrate grade, reduces the tin concentrate yield, and thus greatly increases the value of tin in the tin concentrate. The method of the present invention can effectively reduce the cost of flotation recovery of tin from shaking table tailings, and is more convenient for promotion and utilization in existing concentrators, which not only realizes the efficient development and utilization of tin resources, avoids the waste of tin resources, but also improves the efficiency of the concentrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a process flow chart of the low-cost ore dressing method for recovering cassiterite from shaking table tailings adopted in Examples 1-3 of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is described in detail below through specific embodiments. The following embodiments are intended to further illustrate the content of the present invention in detail, but are not intended to limit the scope of protection of the claims of the present invention.

[0038] In the following examples, the pharmaceutical agents used are all commercially available products. Unless otherwise specified, the content percentages in each example are all mass percentages.

[0039] Example 1: A low-cost beneficiation method for recovering cassiterite from shaking table tailings

[0040] This embodiment provides a low-cost beneficiation method for recovering cassiterite from shaking table tailings. The process flow chart of the treatment method is as follows: Figure 1 As shown, the sample to be processed is the shaking table tailings of a concentrator in Xilin Gol League, Inner Mongolia Autonomous Region, in which the tin grade is 0.65%, and the content of silicate minerals such as tourmaline, quartz, and amphibole accounts for about 80%. It is a typical tourmaline tin ore. The processing method includes the following steps:

[0041] S1: subjecting the shaking table tailings slurry with a concentration of 25% to a strong magnetic separation operation, which includes a strong magnetic roughing separation operation and a strong magnetic concentration separation operation; the shaking table tailings slurry is first subjected to a strong magnetic roughing separation operation, the magnetic field strength of which is 1.5T, to obtain a strong magnetic rough concentrate and a strong magnetic roughing tailings, respectively; the strong magnetic rough concentrate is then subjected to a strong magnetic concentration operation, the magnetic field strength of which is 1.3T, to obtain a strong magnetic concentrate and a strong magnetic concentration tailings, respectively; the strong magnetic roughing tailings and the strong magnetic concentration tailings are combined as strong magnetic tailings;

[0042] The tin grade of the strong magnetic tailings is 1.05%, and the tin recovery rate is 87.16%; the tin grade of the strong magnetic concentrate is 0.18%, and the tin recovery rate is 12.84%.

[0043] S2: The strong magnetic tailings obtained in step S1 are subjected to cyclone classification, the grading particle size of the cyclone classification is 10 μm, a hydrocyclone with a diameter of 100 mm is used, and the feed pressure of the cyclone is 0.45 MPa, and coarse particle products and fine particle and fine mud products are obtained respectively;

[0044] The tin grade of the coarse-grained product is 1.53%, and the tin recovery rate is 71.93%; the tin grade of the fine-grained and fine-sludge products is 0.43%, and the tin recovery rate is 15.23%.

[0045] S3: After the fine particles and fine mud products are slurried to a concentration of 15%, they enter the Falcon centrifuge with a centrifugal acceleration of 220G and an operating pressure of 120PSI to obtain centrifugal concentrate and centrifugal tailings respectively;

[0046] The tin grade of centrifugal concentrate is 1.42%, and the tin recovery rate is 11.69%; the tin grade of centrifugal tailings is 0.13%, and the recovery rate is 3.55%.

[0047] S4: Combine the centrifugal concentrate obtained in step S3 and the coarse particle product obtained in step S2, add 1500 g / t of adjusting agent, and stir for 25 minutes; add 500 g / t of collector, stir for 15 minutes, add 80 g / t of auxiliary collector, and stir for 15 minutes; perform flotation roughing operation on the stirred pulp to obtain roughing concentrate and roughing tailings, add 600 g / t of adjusting agent to the roughing concentrate, stir for 5 minutes to perform concentration 1 operation to obtain concentration 1 concentrate and concentration 1 tailings, add 300 g / t of adjusting agent to the concentration 1 concentrate, stir 5 minutes for beneficiation 2 operation to obtain beneficiation 2 concentrate and beneficiation 2 tailings, add 300g / t of adjusting agent to the beneficiation 2 concentrate, stir for 5 minutes to carry out beneficiation 3 operation to obtain flotation concentrate and beneficiation 3 tailings, add 125g / t of collector to the roughing tailings, stir for 15 minutes, add 20g / t of auxiliary collector, stir for 15 minutes to enter scavenging, and obtain scavenging concentrate and flotation tailings; among which the scavenging concentrate and beneficiation 1 tailings are returned to the flotation roughing operation, the beneficiation 2 tailings are returned to the beneficiation 1 operation, and the beneficiation 3 tailings are returned to the beneficiation 2 operation.

[0048] The flotation concentrate yield is 1.53%, the tin grade is 32.56%, and the tin recovery rate is 76.64%; the flotation tailings yield is 34.39%, the tin grade is 0.13%, and the tin recovery rate is 6.98%.

[0049] The yield of the tin concentrate product obtained in this example is 1.53%, the tin grade is 32.56%, and the tin recovery rate is 76.64%.

[0050] Example 2: A low-cost beneficiation method for recovering cassiterite from shaking table tailings

[0051] This embodiment provides a low-cost beneficiation method for recovering cassiterite from shaking table tailings. The process flow chart of the treatment method is as follows: Figure 1 As shown, the sample to be processed is the tailings of a shaking table of a concentrator in Huanggang, Inner Mongolia Autonomous Region, in which the tin grade is 0.52%, and the content of silicate minerals such as tourmaline, pyroxene, amphibole, and mica accounts for about 70%. It is a typical tourmaline tin ore. The processing method includes the following steps:

[0052] S1: subjecting the shaking table tailings slurry with a concentration of 27% to a strong magnetic separation operation, which includes a strong magnetic roughing separation operation and a strong magnetic concentration separation operation; the shaking table tailings slurry is first subjected to a strong magnetic roughing separation operation, the magnetic field strength of which is 1.2T, to obtain a strong magnetic rough concentrate and a strong magnetic roughing tailings, respectively; the strong magnetic rough concentrate is then subjected to a strong magnetic concentration operation, the magnetic field strength of which is 1.0T, to obtain a strong magnetic concentrate and a strong magnetic concentration tailings, respectively; the strong magnetic roughing tailings and the strong magnetic concentration tailings are combined as strong magnetic tailings;

[0053] The tin grade of the strong magnetic tailings is 0.80%, and the tin recovery rate is 89.53%; the tin grade of the strong magnetic concentrate is 0.15%, and the tin recovery rate is 10.47%.

[0054] S2: The strong magnetic tailings obtained in step S1 are subjected to cyclone classification, the grading particle size of the cyclone classification is 30 μm, a hydrocyclone with a diameter of 150 mm is used, and the feed pressure of the cyclone is 0.3 MPa, and coarse particle products and fine particle and fine mud products are obtained respectively;

[0055] The tin grade of the coarse-grained product is 1.13%, and the tin recovery rate is 70.53%; the tin grade of the fine-grained and fine-sludge products is 0.38%, and the tin recovery rate is 19.00%.

[0056] S3: After the fine particles and fine mud products are slurried to a concentration of 15%, they enter the Falcon centrifuge with a centrifugal acceleration of 280G and an operating pressure of 140PSI to obtain centrifugal concentrate and centrifugal tailings respectively;

[0057] The tin grade of centrifugal concentrate is 1.16%, and the tin recovery rate is 14.14%; the tin grade of centrifugal tailings is 0.13%, and the recovery rate is 4.86%.

[0058] S4: Combine the centrifugal concentrate obtained in step S3 with the coarse particle product obtained in step S2, add 1000 g / t of adjusting agent, and stir for 15 minutes; add 500 g / t of collector, stir for 20 minutes, add 55 g / t of auxiliary collector, and stir for 15 minutes; perform flotation roughing operation on the stirred pulp to obtain roughing concentrate and roughing tailings, add 500 g / t of adjusting agent to the roughing concentrate, stir for 5 minutes to perform concentrating 1 operation to obtain concentrating 1 concentrate and concentrating 1 tailings, add 250 g / t of adjusting agent to the concentrating 1 concentrate, stir The concentrate 2 operation is carried out for 5 minutes to obtain the concentrate 2 concentrate and the concentrate 2 tailings, 250g / t of adjusting agent is added to the concentrate 2 concentrate, and the mixture is stirred for 5 minutes to enter the concentrate 3 operation to obtain the flotation concentrate and the concentrate 3 tailings, 100g / t of collector is added to the rougher tailings, and the mixture is stirred for 15 minutes, 15g / t of auxiliary collector is added, and the mixture is stirred for 15 minutes to enter the scavenging operation to obtain the scavenging concentrate and the flotation tailings; the scavenging concentrate and the concentrate 1 tailings are returned to the flotation rougher operation, the concentrate 2 tailings are returned to the concentrate 1 operation, and the concentrate 3 tailings are returned to the concentrate 2 operation.

[0059] The flotation concentrate yield is 1.35%, the tin grade is 30.38%, and the tin recovery rate is 74.57%; the flotation tailings yield is 39.71%, the tin grade is 0.14%, and the tin recovery rate is 10.10%.

[0060] The yield of the tin concentrate product obtained in this example is 1.35%, the tin grade is 30.38%, and the tin recovery rate is 74.57%.

[0061] Example 3: A low-cost beneficiation method for recovering cassiterite from shaking table tailings

[0062] This embodiment provides a low-cost beneficiation method for recovering cassiterite from shaking table tailings. The process flow chart of the treatment method is as follows: Figure 1 As shown, the sample to be processed is the tailings of a shaking table of a concentrator in Gejiu, Yunnan, in which the tin grade is 0.33%, and the content of silicate minerals such as tourmaline, pyroxene, amphibole, and mica accounts for about 75%. It is a typical tourmaline tin ore. The processing method includes the following steps:

[0063] S1: subjecting the shaking table tailings slurry with a concentration of 25% to a strong magnetic separation operation, which includes a strong magnetic roughing separation operation and a strong magnetic concentration separation operation; the shaking table tailings slurry is first subjected to a strong magnetic roughing separation operation, the magnetic field strength of which is 1.2T, to obtain a strong magnetic rough concentrate and a strong magnetic roughing tailings, respectively; the strong magnetic rough concentrate is then subjected to a strong magnetic concentration operation, the magnetic field strength of which is 1.0T, to obtain a strong magnetic concentrate and a strong magnetic concentration tailings, respectively; the strong magnetic roughing tailings and the strong magnetic concentration tailings are combined as strong magnetic tailings;

[0064] The tin grade of the strong magnetic tailings is 0.49%, and the tin recovery rate is 85.78%; the tin grade of the strong magnetic concentrate is 0.11%, and the tin recovery rate is 14.22%.

[0065] S2: The strong magnetic tailings obtained in step S1 are subjected to cyclone classification, the grading particle size of the cyclone classification is 20 μm, a hydrocyclone with a diameter of 150 mm is used, and the feed pressure of the cyclone is 0.15 MPa, and coarse particle products and fine particle and fine mud products are obtained respectively;

[0066] The tin grade of the coarse-grained product is 0.63%, and the tin recovery rate is 50.69%; the tin grade of the fine-grained and fine-sludge products is 0.38%, and the tin recovery rate is 35.09%.

[0067] S3: After the fine particles and fine mud products are slurried to a concentration of 15%, they enter the Falcon centrifuge with a centrifugal acceleration of 260G and an operating pressure of 140PSI to obtain centrifugal concentrate and centrifugal tailings respectively;

[0068] The tin grade of centrifugal concentrate is 1.63%, and the tin recovery rate is 29.05%; the tin grade of centrifugal tailings is 0.08%, and the recovery rate is 6.04%.

[0069] S4: Combine the centrifugal concentrate obtained in step S3 and the coarse particle product obtained in step S2, add 1000 g / t of adjusting agent, and stir for 10 minutes; add 300 g / t of collector, stir for 10 minutes, add 40 g / t of auxiliary collector, and stir for 10 minutes; perform flotation roughing operation on the stirred pulp to obtain roughing concentrate and roughing tailings, add 400 g / t of adjusting agent to the roughing concentrate, stir for 5 minutes to perform concentrating 1 operation to obtain concentrating 1 concentrate and concentrating 1 tailings, add 200 g / t of adjusting agent to the concentrating 1 concentrate, stir The concentrate 2 operation is carried out for 5 minutes to obtain the concentrate 2 concentrate and the concentrate 2 tailings, 200g / t of adjusting agent is added to the concentrate 2 concentrate, and the mixture is stirred for 5 minutes to carry out the concentrate 3 operation to obtain the flotation concentrate and the concentrate 3 tailings, 75g / t of collector is added to the roughing tailings, and the mixture is stirred for 10 minutes, 10g / t of auxiliary collector is added, and the mixture is stirred for 10 minutes to enter the scavenging operation to obtain the scavenging concentrate and the flotation tailings; the scavenging concentrate and the concentrate 1 tailings are returned to the flotation roughing operation, the concentrate 2 tailings are returned to the concentrate 1 operation, and the concentrate 3 tailings are returned to the concentrate 2 operation.

[0070] The flotation concentrate yield is 0.71%, the tin grade is 34.22%, and the tin recovery rate is 73.62%; the flotation tailings yield is 31.72%, the tin grade is 0.06%, and the tin recovery rate is 6.12%.

[0071] The yield of the tin concentrate product obtained in this example is 0.71%, the tin grade is 34.22%, and the tin recovery rate is 73.62%.

[0072] Comparative Example 1

[0073] The treated sample is the same as that in Example 1, which is a shaking table tailings of a concentrator in Xilin Gol League, Inner Mongolia Autonomous Region, wherein the tin grade is 0.65%. The treatment method comprises the following steps:

[0074] Add 1500g / t of adjusting agent to the shaking table tailings slurry with a concentration of 25%, stir for 25 minutes; add 900g / t of collector, stir for 15 minutes, add 80g / t of auxiliary collector, stir for 15 minutes; carry out flotation roughing operation on the stirred slurry to obtain roughing concentrate and roughing tailings, add 600g / t of adjusting agent to the roughing concentrate, stir for 5 minutes to carry out concentrating 1 operation to obtain concentrating 1 concentrate and concentrating 1 tailings, add 300g / t of adjusting agent to the concentrating 1 concentrate, stir for 5 minutes to carry out concentrating 2 operation to obtain concentrated 2 concentrate and concentrated 2 tailings, add 300g / t of adjusting agent to the concentrated 2 concentrate, stir for 5 minutes to carry out concentrated 3 operation to obtain flotation concentrate and concentrated 3 tailings, add 125g / t of collector to the roughing tailings, stir for 15 minutes, add 20g / t of auxiliary collector, stir for 15 minutes to enter scavenging, and obtain scavenging concentrate and flotation tailings; among which the scavenging concentrate and concentrated 1 tailings are returned to the flotation roughing operation, the concentrated 2 tailings are returned to the concentrated 1 operation, and the concentrated 3 tailings are returned to the concentrated 2 operation.

[0075] The flotation concentrate yield is 9.56%, the tin grade is 4.63%, and the tin recovery rate is 68.10%.

[0076] Comparative Example 2

[0077] The treated sample is the same as that in Example 1, which is a shaking table tailings of a concentrator in Xilin Gol League, Inner Mongolia Autonomous Region, wherein the tin grade is 0.65%. The treatment method comprises the following steps:

[0078] S1: The shaking table tailings slurry with a concentration of 25% is subjected to cyclone classification. The grading particle size of the cyclone classification is 10μm. A hydrocyclone with a diameter of 100mm is used. The feed pressure of the cyclone is 0.45Mpa, and coarse particles and fine particles and fine mud products are obtained respectively;

[0079] The tin grade of the coarse-grained product is 0.80%, and the tin recovery rate is 85.86%; the tin grade of the fine-grained and fine-sludge products is 0.33%, and the tin recovery rate is 15.05%.

[0080] S2: Add 1500 g / t of adjusting agent to the coarse product obtained in step S1, and stir for 25 minutes; add 500 g / t of collector, stir for 15 minutes, add 80 g / t of auxiliary collector, and stir for 15 minutes; perform flotation roughing operation on the stirred pulp to obtain roughing concentrate and roughing tailings, add 600 g / t of adjusting agent to the roughing concentrate, stir for 5 minutes to perform concentrating operation 1, obtain concentrating concentrate 1 and concentrating tailings 1, add 300 g / t of adjusting agent to the concentrating concentrate 1, stir for 5 minutes to perform concentrating operation 1 2 operation to obtain concentrated 2 concentrate and concentrated 2 tailings, add 300g / t of adjusting agent to the concentrated 2 concentrate, stir for 5 minutes to carry out concentrated 3 operation to obtain flotation concentrate and concentrated 3 tailings, add 125g / t of collector to the roughing tailings, stir for 15 minutes, add 20g / t of auxiliary collector, stir for 15 minutes to enter scavenging, and obtain scavenging concentrate and flotation tailings; among which the scavenging concentrate and concentrated 1 tailings are returned to the flotation roughing operation, the concentrated 2 tailings are returned to the concentrated 1 operation, and the concentrated 3 tailings are returned to the concentrated 2 operation.

[0081] The flotation concentrate has a tin grade of 8.36% and a tin recovery rate of 67.23%.

[0082] Comparative Example 3

[0083] The treated sample is the same as that in Example 1, which is a shaking table tailings of a concentrator in Xilin Gol League, Inner Mongolia Autonomous Region, wherein the tin grade is 0.65%. The treatment method comprises the following steps:

[0084] S1: The shaking table tailings slurry with a concentration of 25% is subjected to cyclone classification. The grading particle size of the cyclone classification is 10μm. A hydrocyclone with a diameter of 100mm is used. The feed pressure of the cyclone is 0.45Mpa, and coarse particles and fine particles and fine mud products are obtained respectively;

[0085] The tin grade of the coarse-grained product is 0.80%, and the tin recovery rate is 85.86%; the tin grade of the fine-grained and fine-sludge products is 0.33%, and the tin recovery rate is 15.05%.

[0086] S2: Add 1500 g / t of sodium carbonate to the coarse product obtained in step (1), and stir for 25 minutes; add 500 g / t of benzohydroxamic acid, stir for 15 minutes, add 80 g / t of tributyl phosphate, and stir for 15 minutes; perform flotation and roughing operation on the stirred slurry to obtain roughing concentrate and roughing tailings, add 600 g / t of sodium carbonate to the roughing concentrate, stir for 5 minutes, and enter the flotation 1 operation to obtain flotation 1 concentrate and flotation 1 tailings, add 300 g / t of sodium carbonate to the flotation 1 concentrate, stir for 5 minutes, and enter the flotation 2 operation. Select 2 operation, obtain Select 2 concentrate and Select 2 tailings, add 300g / t of sodium carbonate to Select 2 concentrate, stir for 5 minutes and enter Select 3 operation to obtain flotation concentrate and Select 3 tailings, add 125g / t of benzohydroxamic acid to the roughing tailings, stir for 15 minutes, add 20g / t of 2# oil, stir for 15 minutes and enter scavenging to obtain scavenging concentrate and flotation tailings; among which the scavenging concentrate and Select 1 tailings are returned to the flotation roughing operation, the Select 2 tailings are returned to the Select 1 operation, and the Select 3 tailings are returned to the Select 2 operation.

[0087] The flotation concentrate has a tin grade of 6.58% and a tin recovery rate of 65.73%.

[0088] The types of drugs and their proportions in the embodiments and comparative examples are shown in Table 1.

[0089] Table 1: Types of drugs and their proportions in the examples

[0090]

[0091]

[0092] By comparing Example 1 with Comparative Example 1, it can be seen that:

[0093] The shaking table tailings are 1500t / d in total. By using the process of comparative example 1, direct flotation can obtain a concentrate product 1 with a tin grade of 4.63% and a recovery rate of 68.10%, and the amount of tin metal is 6.64t / d. By using the process of embodiment 1, a concentrate product 2 with a tin grade of 32.56% and a recovery rate of 76.64% can be obtained, and the amount of tin metal is 7.47t / d. According to the different tin sales prices of different tin grades, the unit price of concentrate 1 product (low grade) is 117,000 yuan / t·metal, the unit price of concentrate 2 product (high grade) is 234,000 yuan / t·metal, the sales price of concentrate 2 is 1,748,000 yuan / d, and the sales price of concentrate 1 is 776,900 yuan / d. Compared with comparative example 1, the concentrate value of embodiment 1 has increased by 971,100 yuan / d.

[0094] In terms of reagent cost, after pre-enrichment in Example 1, the yield entering flotation is 35.92%, the ore volume is 538.8t / d, the ore volume is reduced by 64.08%, the flotation feed properties are changed, the slime content is reduced, the collector dosage is reduced from the original 900g / t (Comparative Example 1) to 500g / t, and the reagent cost is reduced from 54,000 yuan / d (Comparative Example 1) to 11,000 yuan / d (Example 1).

[0095] Calculated from the two aspects of increased concentrate value and reduced reagent costs, the revenue from tin flotation increased by 1.0141 million yuan per day. Based on 330 working days per year, the annual revenue increased by 335 million yuan per year. This revenue does not take into account the benefits brought by reduced transportation costs, personnel costs, and equipment wear and tear costs.

[0096] This shows that the method of the present invention can significantly improve the ability of on-site tin flotation to cope with market changes, and provides a strong guarantee for the efficient development and utilization of tin resources.

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A low-cost beneficiation method for recovering cassiterite from shaking table tailings, characterized in that: The following steps are involved: S1: subject the shaking table tailings to strong magnetic roughing operation to obtain strong magnetic rough concentrate and strong magnetic roughing tailings respectively; subject the strong magnetic rough concentrate to strong magnetic concentration operation to obtain strong magnetic concentration concentrate and strong magnetic concentration tailings respectively; combine the strong magnetic roughing tailings and the strong magnetic concentration tailings to obtain strong magnetic tailings; S2: The strong magnetic tailings are classified by cyclone to obtain coarse particle products and fine particle and fine mud products respectively; S3: centrifugal gravity separation of fine particles and fine mud products to obtain centrifugal concentrate and centrifugal tailings respectively; S4: The centrifugal concentrate and the coarse-grained product are combined and subjected to flotation roughing operation to obtain roughing concentrate and roughing tailings; the roughing concentrate is subjected to concentration 1 operation to obtain concentration 1 concentrate and concentration 1 tailings; the concentration 1 concentrate is subjected to concentration 2 operation to obtain concentration 2 concentrate and concentration 2 tailings; the concentration 2 concentrate is subjected to concentration 3 operation to obtain flotation concentrate and concentration 3 tailings; the roughing tailings are subjected to scavenging operation to obtain scavenging concentrate and flotation tailings; the scavenging concentrate and concentration 1 tailings are returned to the flotation roughing operation, the concentration 2 tailings are returned to the concentration 1 operation, and the concentration 3 tailings are returned to the concentration 2 operation.

2. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 1 is characterized in that: The flotation roughing operation in step S4 includes: adding a regulator and stirring for 10-25 minutes; adding a collector and stirring for 10-20 minutes; adding an auxiliary collector and stirring for 10-15 minutes.

3. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 1 is characterized in that: In step S4, during the selection 1, selection 2 and selection 3 operations, the adjusting agent is added respectively and stirred for 3-10 minutes; during the scanning selection, the collecting agent is added and stirred for 10-15 minutes, and the auxiliary collecting agent is added and stirred for 10-15 minutes.

4. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 2 is characterized in that: The dosage of the adjusting agent is 1000-1500 g / t, the dosage of the collecting agent is 300-500 g / t, and the dosage of the auxiliary collecting agent is 40-80 g / t.

5. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 3 is characterized in that: The amount of the adjusting agent added during the selection 1 operation is 400-600g / t; the amount of the adjusting agent added during the selection 2 operation is 200-300g / t; the amount of the adjusting agent added during the selection 3 operation is 200-300g / t; the amount of the collecting agent added during the scavenging process is 75-125g / t, and the amount of the auxiliary collecting agent added is 10-20g / t.

6. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 2 or 3, characterized in that: The adjusting agent is prepared from tannic acid, aluminum sulfate and water glass in a mass ratio of 1:2-3:6-9.

7. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 2 or 3, characterized in that: The collector includes 1-hydroxy 2-naphthohydroxamic acid and dihydroxybenzohydroxamic acid compounds.

8. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 7 is characterized in that: The collector is prepared from 1-hydroxy 2-naphthohydroxamic acid and dihydroxybenzohydroxamic acid compounds in a mass ratio of 1:2-3.

9. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 7 is characterized in that: The dihydroxybenzohydroxamic acid compound is 2,3-dihydroxybenzohydroxamic acid or 3,4-dihydroxybenzohydroxamic acid.

10. The low-cost ore dressing method for recovering cassiterite from shaking table tailings according to claim 2 or 3, characterized in that: The auxiliary collector is prepared from fusel oil and triester phosphate in a mass ratio of 1:1-2.

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