Method for grading and quality-based resource utilization of tin mine tailings

Abstract

The application discloses a method for grading and quality resource utilization of tin mine tailings, and through in-depth research on the composition of the specific raw material property of the tin mine tailings, the tin mine tailings raw material is divided into +60 mesh, -60 mesh to +100 mesh and -100 mesh different particle size minerals by using screening grading and circulating rod grinding, the -60 mesh to +100 mesh particle size minerals are treated by adopting a table reselection process to recover coarse-grained siliceous products, impurities are removed through a reclassification-reselection-flotation combined process, so that the products respectively reach the relevant standards of building materials and cement raw materials, and finally the coarse-grained products are used for silicate building product sand, the medium and fine-grained products are used for cement batching siliceous raw materials, and S and tin in the tailings are recovered at the same time, so that the resource utilization of the tin mine tailings is finally realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive recycling of tailings resources, and particularly relates to a method for grading and quality-based resource utilization of tin mine tailings. BACKGROUND

[0002] The large amount of tin tailings stacking not only occupies land resources, but also causes environmental pollution, safety hazards, and waste of valuable resources, thereby seriously restricting the development of the tin industry.

[0003] Due to different deposit conditions and geological origins of tin mines in different places and different beneficiation processes, the tin tailings produced are also different in nature, but generally contain valuable metal elements such as tin, iron, lead, zinc, silver, and indium, and have high recycling value. At the same time, non-metallic minerals such as quartz, feldspar, calcite, and fluorite also have recycling value under certain conditions. Therefore, it is very important to analyze the properties of different tin tailings and research and promote the comprehensive recycling of tin tailings resources. This is of great significance to solving the problem of large amount of tailings stacking, reducing waste of valuable resources, improving economic benefits, protecting the environment, and promoting the sustainable development of the tin industry. SUMMARY

[0004] The purpose of the present application is to solve the above technical problems and provide a method for grading and quality-based resource utilization of tin mine tailings, which has high resource utilization rate and can effectively reduce the discharge amount of tailings.

[0005] To achieve the above purpose, the technical solution of the present application is as follows:

[0006] A method for grading and quality-based resource utilization of tin mine tailings, comprising the following steps:

[0007] (1) screen the tin mine tailings with a 60-mesh screen to obtain +60-mesh and -60-mesh screening products 1; screen the -60-mesh screening products 1 with a 100-mesh screen to obtain -60-mesh to +100-mesh and -100-mesh screening products 2;

[0008] (2) cycle rod mill the +60-mesh screening products 1 of step (1), and then pass them through a 60-mesh screen and a 100-mesh screen in sequence to obtain +60-mesh, -60-mesh to +100-mesh, and -100-mesh screening products 3;

[0009] (3) combine the -60-mesh to +100-mesh screening products 2 obtained in step (1) and the -60-mesh to +100-mesh screening products 3 obtained in step (2), and then perform table concentrator gravity separation to obtain table concentrator concentrate and table concentrator tailings 1; combine the table concentrator tailings 1 with the +60-mesh screening products 3 to obtain coarse-grained siliceous products; and perform discarding treatment on the table concentrator concentrate;

[0010] (4) combine the -100 mesh screened product 2 obtained in step (1) and the -100 mesh screened product 3 obtained in step (2), and screen through a 200 mesh screen to obtain a -100 mesh ~ +200 mesh screened product 4 and a -200 mesh screened product 4;

[0011] (5) subject the -100 mesh ~ +200 mesh screened product 4 obtained in step (4) to table re- selection and middling re- table, to obtain a table tailing 2 and a re- selected sulfur and tin containing concentrate; the table re- selection and middling re- table is to take out the middling obtained in the table re- selection in this step, and re- select in the table by twice addition without discarding the concentrate and the tailing, to finally obtain the table tailing 2 and the re- selected sulfur and tin containing concentrate;

[0012] (6) subject the table tailing 2 in step (5) to reverse flotation of quartz, to obtain a flotation concentrate as a cement siliceous raw material; and the flotation tailing is discarded;

[0013] (7) subject the re- selected sulfur and tin containing concentrate obtained in step (5) to flotation desulfurization, to obtain a sulfur concentrate and a tin containing tailing.

[0014] As a further technical solution, in the tin mine tailing described above, the mass content of Si is 29-35%, the mass content of S is less than 3%, and the mass content of Sn is less than 0.1%.

[0015] As a further technical solution, in the tin mine tailing described above, the mass content of Si is 29-30%, the mass content of Ca is 10-12%, the mass content of S is 2-2.7%, the mass content of As is 0.4-0.5%, the mass content of Sn is 0.03-0.05%, the mass content of Fe is 3.3-3.4%, the mass content of K is 1.1-1.2%, and the balance is inevitable impurities.

[0016] As a further technical solution, in the step (1) above, the yield of the +100 mesh screened product is required to be greater than 75%, the mass content of SiO2 is greater than 65%, the mass content of S is 1.3%-1.5%, and the mass fraction of the total amount of potassium oxide and sodium oxide is less than 5%; the +100 mesh screened product is a +60 mesh screened product 1 and a -60 mesh ~ +100 mesh screened product 2. The limitation here is obtained according to the requirements of the building material siliceous raw material (content of silicon dioxide, content of S, etc.) combined with the test results.

[0017] As a further technical solution, in the step (2) above, the first rod milling time of the circulating rod mill is 4-6 minutes, and the subsequent rod milling time is 2-3 minutes; after each rod milling, the rod milling product is screened through a 60 mesh screen, and the screened product is returned to the rod mill; when the total yield of the screened product is less than 15%, the circulating rod milling is stopped.

[0018] As a further technical solution, in the above step (3), the process conditions of the table reselection are: stroke 1.2-2.0 cm, frequency 300-350 times / min, bed surface transverse slope 1°30"-3°30", and ore mass concentration 15%-25%.

[0019] As a further technical solution, in the above step (5), the process conditions of the table reselection-middling re-table are: stroke 0.8-1.5 cm, frequency 320-380 times / min, bed surface transverse slope 1°30"-3°30", and ore mass concentration 15%-25%.

[0020] As a further technical solution, in the above step (6), the ore mass concentration of the quartz reverse flotation is 30%-40%; the reagents added in the quartz reverse flotation in turn are: collector sodium oleate 200-300 g / t·ore, frother No. 2 oil 50-100 g / t·ore; in the process of the quartz reverse flotation, the collector is stirred for 2-4 minutes after being added, the frother is stirred for 1-3 minutes after being added, and the scraping time is 3-5 minutes.

[0021] As a further technical solution, in the above step (7), the flotation desulfurization comprises the following steps:

[0022] (a) ball-milling the reselection sulfur-containing tin-containing concentrate, the ball-milling time being 15-30 s, to obtain a ball-milled product;

[0023] (b) roughing the ball-milled product to obtain a roughing concentrate and a roughing tailing; the reagents added in the roughing in turn are: sodium sulfide 200-300 g / t·ore, copper sulfate 200-400 g / t·ore, butyl xanthate 50-100 g / t·ore + butyl ammonium black 25-50 g / t·ore, and No. 2 oil 60-100 g / t·ore;

[0024] (c) first scavenging the roughing tailing to obtain a first scavenging concentrate and a first scavenging tailing; returning the first scavenging concentrate to step (b) and combining it with the ball-milled product of the next round to perform roughing; the reagents added in the first scavenging in turn are: copper sulfate 100-200 g / t·ore, butyl xanthate 25-50 g / t·ore + butyl ammonium black 15-25 g / t·ore, and No. 2 oil 30-50 g / t·ore;

[0025] (d) second scavenging the first scavenging tailing to obtain a second scavenging concentrate and a second scavenging tailing; returning the second scavenging concentrate to step (c) and combining it with the roughing tailing of the next round to perform first scavenging; the reagents added in the second scavenging in turn are: butyl xanthate 15-25 g / t·ore + butyl ammonium black 10-15 g / t·ore, and No. 2 oil 15-25 g / t·ore;

[0026] (e) the third scavenging is performed on the scavenging tailings II to obtain scavenging concentrates III and scavenging tailings III; the scavenging concentrates III are returned to step (d) and combined with the scavenging tailings I of the next round to perform the second scavenging; the scavenging tailings III are used as tin-containing tailings; the reagents added in the third scavenging in turn are: butyl xanthate 5-15 g / t feed + ammonium butyl dithiophosphate 5-10 g / t feed, No. 2 oil 5-15 g / t feed;

[0027] (f) the sulfur concentration is performed on the roughing concentrates to obtain sulfur concentrates and concentration tailings; the concentration tailings are returned to step (b) and combined with the product after ball milling of the next round to perform the roughing; the sulfur concentration does not add reagents.

[0028] As a further technical solution, in the above-mentioned flotation desulfurization, the stirring time after adding No. 2 oil is 1-3 minutes, and the stirring time after adding each kind of reagent is 2-4 minutes; the froth scraping time of the roughing is 3-5 minutes; the froth scraping time of the first, second, third scavengings and the sulfur concentration is 2-4 minutes.

[0029] It should be noted that the particle size of the present application is indicated by "+" "-" to represent the relationship between the sieve and the sieve, for example, +60 mesh is the sieve product above the 60 mesh sieve, -60 mesh is the sieve product below the 60 mesh sieve, -60 mesh ~ +100 mesh is the sieve product below the 60 mesh sieve and above the 100 mesh sieve. The aperture of the 60 mesh sieve is 0.25 mm, the aperture of the 100 mesh sieve is 0.15 mm, and the aperture of the 200 mesh sieve is 0.075 mm.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] 1. The present application is mainly used for treating tin mine tailings with low metal content and high siliceous components. The main minerals of such tailings are quartz, calcite, feldspar and pyrite, etc. The present application divides the tin mine tailings into +60 mesh, -60 mesh ~ +100 mesh and -100 mesh different particle size minerals by screening classification and circulating rod milling, recovers coarse-grained siliceous products by using the shaking table gravity separation process to treat -60 mesh ~ +100 mesh particle size minerals, removes impurities by re-classification-gravity separation-flotation combined process, so that the products meet the relevant standards of building materials and cement raw materials, and finally realizes that the coarse-grained products are used for silicate building products sand, the medium-fine-grained products are used for cement siliceous raw materials, and S and tin in the tailings are recovered, so that the resource utilization of the tin mine tailings is realized, the coarse-grained siliceous products can meet the requirements of qualified products for building products sand, the yield reaches 45-60%; the cement siliceous raw materials can meet the product requirements, the yield reaches 10-15%; the sulfur concentrate S grade can reach 28-33%, and the yield reaches 3-6%.

[0032] 2、The present application greatly reduces the discharge amount of tailings by comprehensive recovery of tin mine tailings, is not only green and environmental protection, but also reduces the tailings treatment cost, improves the economic benefit;

[0033] 3、The present application can also provide technical reference and demonstration guidance for comprehensive recovery and utilization of other similar non-ferrous metal tailings. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a flowchart of the method of the present application;

[0035] Figure 2 It is a flowchart of Example 1 of the present application;

[0036] Figure 3 It is a flowchart of the raw material -100 mesh desulfurization flotation experiment of Comparative Example 2 of the present application;

[0037] Figure 4 It is a flowchart of the raw material -100 mesh desliming-desulfurization flotation experiment of Comparative Example 3 of the present application;

[0038] Figure 5 It is a flowchart of the raw material -100 mesh ~ +200 mesh sample flotation desulfurization-quartz reverse flotation experiment of Comparative Example 5 of the present application. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below in combination with examples, but the embodiments of the present application are not limited to the scope represented by the examples.

[0040] The raw material used in this example is tin mine tailings from a tin ore dressing plant in Guangxi, and the chemical analysis of the sample is shown in Table 1, the contents of Si, Sn, S and As are 29.97%, 0.04%, 2.65% and 0.43% respectively, and the main minerals are quartz, calcite, feldspar and pyrite, etc. The metal content in the raw material is low, and it is not meaningful to directly recover the valuable metals. The siliceous component content in the raw material is high, and after separation and enrichment, the harmful impurities (sulfur and arsenic) are removed, it can be used for building materials such as sand, cement raw materials, etc.

[0041] Table 1 Chemical multi-element analysis results of raw material, %

[0042]

[0043] According to the grade requirement of the qualified product of the sand for silicate building products in the recommended standard JC / T 622-2009 in the building material industry, the mass fraction of silicon dioxide is greater than or equal to 65%, the mass fraction of potassium oxide and sodium oxide is less than or equal to 5.0%, the mass fraction of mica is less than or equal to 1.0%, the mass fraction of sulfide and sulfate (calculated by SO3) is less than or equal to 2.0%, the mud content is less than or equal to 8.0%, and the water content is less than or equal to 8.0%. As the main auxiliary raw material for producing silicate cement clinker, the general requirement of the silicon raw material is that the SiO2 content is more than 75%, the low-alkali cement clinker is generally required, the R2O (K2O+Na2O) in the silicon-aluminum raw material is less than or equal to 2.0%, the MgO is less than or equal to 3%, and the SO3 is less than or equal to 2%. The sample treatment is mainly carried out according to the above standard as the target, so that the product can be flexibly applied to the production of different types and processes of cement clinker.

[0044] Example 1:

[0045] As shown in Figure 1 and Figure 2 , a method for grading and quality resource utilization of tin mine tailings, comprising the following steps:

[0046] (1) The obtained tin mine tailings are sieved by using a screen with a mesh size of 60 mesh to obtain +60 mesh and -60 mesh sieved products 1; then the -60 mesh sieved products 1 are sieved by using a screen with a mesh size of 100 mesh to obtain -60~+100 mesh sieved products 2 and -100 mesh sieved products 2; in this step, the yield of the +100 mesh coarse particle level sieved products is 76.74%, the Si content is greater than 30.3% (the content of SiO2 is greater than 65%), the content of S is 1.31%~1.43% (the content of SO3 is 3.28~3.58%), the content of K is 1.11%, the content of Na is 0.03%, and the mass fraction of potassium oxide and sodium oxide is less than 5%, the +100 mesh coarse particle level sieved products contain +60 mesh sieved products 1 and -60~+100 mesh sieved products 2;

[0047] (2) The +60 mesh sieved products 1 obtained in step (1) are subjected to a circulating rod mill, the first rod milling time is 6 minutes, the subsequent circulating rod milling time is 2 minutes, the rod milling product is sieved by using a 60 mesh sieve, the sieve product is returned to the rod mill, and the circulating rod milling is ended until the yield of the sieve product is less than 15%; after the rod milling is ended, the +60 mesh sieved products 3, -60~+100 mesh sieved products 3 and -100 mesh sieved products 3 are obtained by sieving through a 60 mesh screen and a 100 mesh screen in turn;

[0048] (3) combine the -60 mesh to +100 mesh screened product 2 obtained in step (1) with the -60 mesh to +100 mesh screened product 3 obtained in step (2), and then perform table re- beneficiation, the table re-beneficiation process conditions being: stroke 1.2-2.0 cm, frequency 300-350 times / min, bed surface lateral slope 1°30", feed mass concentration 20%, to obtain table tailings 1 and table concentrate;

[0049] (4) combine the -100 mesh screened product 2 obtained in step (1) with the -100 mesh screened product 3 obtained in step (2), and screen through a 200 mesh screen to obtain -100 to +200 mesh screened product 4 and -200 mesh screened product 4;

[0050] (5) perform table re-beneficiation - middlings re-table of the -100 to +200 mesh screened product 4 obtained in step (4), the table re-beneficiation - middlings re-table process conditions being: stroke 0.8-1.5 cm, frequency 320-380 times / min, bed surface lateral slope 1°30", feed mass concentration 20%, to obtain table tailings 2 and re-beneficiation sulfur and tin concentrate;

[0051] (6) perform reverse flotation of quartz on the table tailings 2 obtained in step (5), using sodium oleate as collector, the reverse flotation feed mass concentration being 30%; add sodium oleate collector to the slurry, the dosage being 200 g / t feed, stir for 3 minutes, then add No. 2 oil as frother, the dosage being 60 g / t feed, stir for 1 minute, scrape froth for 4 minutes, and obtain the flotation concentrate as cement siliceous raw material through reverse flotation; the flotation tailings are discarded;

[0052] (7) perform flotation desulfurization on the re-beneficiation sulfur and tin concentrate obtained in step (5) to obtain sulfur concentrate and tin-containing tailings, the flotation desulfurization including the following steps:

[0053] (a) ball mill activate the re-beneficiation sulfur and tin concentrate for 15 s to obtain a ball-milled product;

[0054] (b) perform roughing on the ball-milled product to obtain roughing concentrate and roughing tailings; the roughing successively adds the following reagents: sodium sulfide 200 g / t feed, copper sulfate 200 g / t feed, butyl xanthate 100 g / t feed + ammonium black 50 g / t feed, No. 2 oil 60 g / t feed;

[0055] (c) performing first scavenging on the roughing tailings to obtain a scavenging concentrate I and a scavenging tailings I; the reagents added in the first scavenging in turn are: copper sulfate 100 g / t of feed, butyl xanthate 50 g / t of feed + butyl ammonium black 25 g / t of feed, No. 2 oil 30 g / t of feed; the scavenging concentrate I is returned to step (b) and combined with the product after ball milling in the next round to perform the roughing step;

[0056] (d) performing second scavenging on the scavenging tailings I to obtain a scavenging concentrate II and a scavenging tailings II; the reagents added in the second scavenging in turn are: butyl xanthate 25 g / t of feed + butyl ammonium black 12.5 g / t of feed, No. 2 oil 15 g / t of feed; the scavenging concentrate II is returned to step (c) and combined with the roughing tailings in the next round to perform the first scavenging step;

[0057] (e) performing third scavenging on the scavenging tailings II to obtain a scavenging concentrate III and a scavenging tailings III; the reagents added in the third scavenging in turn are: butyl xanthate 12.5 g / t of feed + butyl ammonium black 6.25 g / t of feed, No. 2 oil 15 g / t of feed; the scavenging concentrate III is returned to step (d) and combined with the scavenging tailings I in the next round to perform the second scavenging step; the scavenging tailings III is a tin-containing tailings.

[0058] (f) performing sulfur concentration on the roughing concentrate to obtain a sulfur concentrate and a concentration tailings; the concentration tailings is returned to step (b) and combined with the product after ball milling in the next round to perform the roughing step; no reagent is added in the sulfur concentration.

[0059] In the one-roughing-one-concentration-three-scavenging flotation operation, the stirring time after adding each reagent is 3 minutes, except for the frother No. 2 oil, the stirring time after adding the frother is 1 minute, the froth scraping time in the roughing is 4 minutes, and the froth scraping times in the first, second, third scavenging and sulfur concentration are 3 minutes respectively.

[0060] The indexes of the coarse-grained siliceous product, the cement siliceous raw material, the sulfur concentrate and the tin-containing tailings obtained by the method of the present application are as follows:

[0061] The coarse-grained siliceous product is composed of two parts: 1) the S content of +60 mesh screened product 3 is reduced to 0.53% (equivalent to SO3 content of 1.325%, <2%), and the total yield is 6.08%; 2) the S content of the shaking table tailings is 0.69% (equivalent to SO3 content of 1.725%, <2%), and the yield is 44.02%.

[0062] The total yield of the coarse-grained siliceous product is 50.10%, the sulfur content is 0.67%, the fine particle modulus is 1.46, which is a special fine sand, the loose bulk density is 1280 g / cm 3 , the tight packing density is 1390 g / cm 3 , which meets the requirements of qualified products for building products.

[0063] The yield of cement silica raw materials was 7.59%, the Si grade was 37.31%, and the S grade was 0.18%, which met the requirements for cement silica raw material products.

[0064] The yield of sulfur concentrate was 4.89%, and the sulfur grade was 29.66%.

[0065] The tin grade in the tin-bearing tailings is 0.3%, which has low recovery value and is disposed of as tailings.

[0066] Screening of coarse-grained silica products

[0067] Comparative Example 1:

[0068] This comparative example does not use the rod milling process in step (2). Instead, the -60 mesh to +100 mesh sieved product 2 obtained in step (1) of Example 1 is directly sieved through an 80 mesh screen. The -60 to +80 mesh and -80 to +100 mesh samples are then subjected to shaking table gravity separation, and the shake table tailings are coarse-grained siliceous product 1 and coarse-grained siliceous product 2.

[0069] The sulfur contents of coarse-grained siliceous product 1 and coarse-grained siliceous product 2 obtained in this comparative example were 1.02% and 0.94%, respectively, which did not meet the sulfur content requirements for qualified building sand.

[0070] The -60 to +80 mesh and -80 to +100 mesh samples obtained by sieving the original samples cannot be directly desulfurized into coarse particles. This is due to the incomplete dissociation of sulfide minerals.

[0071] This demonstrates the superiority of the present invention's process of using a rod mill to perform cyclic rod milling on the +60 mesh screened product 1, followed by reasonable grading, merging, and shaking table reselection.

[0072] Screening of cement siliceous raw materials and recovery of sulfur concentrate

[0073] Comparative Example 2:

[0074] A desulfurization experiment using a "one coarse, three scavenging" process was conducted on the -100 mesh sieve product 2 obtained in step (1) and the -100 mesh sieve product 3 obtained in step (2) in Example 1 to investigate the desulfurization effect of flotation. The experimental flowchart is shown below. Figure 3 As shown:

[0075] The reagents added sequentially in the roughing process are: "activator variable", 200 g / t xanthate in feed, and 60 g / t oil of No. 2 in feed; the activation schemes for the "activator variable" are 200 g / t copper sulfate in feed, 400 g / t sulfuric acid in feed, and 200 g / t copper sulfate in feed + 200 g / t sulfuric acid in feed; the roughing concentrate and roughing tailings are obtained, and the roughing tailings enter the first scavenging process;

[0076] The added reagents in the first cleaning are "activator variable", butyl xanthate 100 g / t feed, and No. 2 oil 30 g / t feed; the activation schemes of the "activator variable" are copper sulfate 200 g / t feed, sulfuric acid 400 g / t feed, copper sulfate 200 g / t feed + sulfuric acid 200 g / t feed, respectively; the middling 1 and the first cleaning tailings are obtained, and the first cleaning tailings enter the second cleaning;

[0077] The added reagents in the second cleaning are butyl xanthate 50 g / t feed and No. 2 oil 15 g / t feed; the second cleaning middling and the second cleaning tailings are obtained.

[0078] The added reagents in the third cleaning are butyl xanthate 25 g / t feed and No. 2 oil 15 g / t feed; the third cleaning middling and the third cleaning tailings are obtained.

[0079] The second cleaning middling and the third cleaning middling are combined to obtain the middling 2.

[0080] In the flotation operation of one roughing and three cleanings, the stirring time after adding each reagent is 3 minutes except for the frother No. 2 oil, the stirring time after adding the frother is 1 minute, the froth scraping time of the roughing is 4 minutes, and the froth scraping times of the first cleaning, the second cleaning and the third cleaning are 3 minutes, respectively.

[0081] When copper sulfate is used as a single activator, the operation recovery rate of S in the roughing concentrate is 40.28%, and the S grade in the third cleaning tailings is reduced to 2.15%;

[0082] When sulfuric acid is used as a single activator, the operation recovery rate of S in the roughing concentrate is 51.18%, and the S grade in the third cleaning tailings is reduced to 2.24%;

[0083] When copper sulfate and sulfuric acid are used in combination, the S content and grade in the desulfurization tailings are higher than those of the single activator. However, the sulfur content does not meet the requirement of the cement batching siliceous raw material.

[0084] The comparative example shows that the "classification-shaking table gravity separation-middling re-shaking-quartz reverse flotation" cement siliceous raw material recovery process of the embodiment is more effective than single flotation.

[0085] Comparative Example 3

[0086] Compared with Comparative Example 2, the only difference is that the sample is subjected to flotation desliming before roughing, and the experimental flow chart is as shown in Figure 4

[0087] Desliming: the amount of No. 2 oil is 60 g / t feed, the stirring time is 3 minutes, and the desliming flotation time is 5 minutes. ​

[0088] After adding the flotation desliming process, the loss rate of S in the flotation slurry is very low, only about 1%. When the dosage of copper sulfate is 200 g / t of feed, the S operating recovery rate of the roughing concentrate is 64.43%, and the S grade is 35.41%. The S operating recovery rate of the concentrate is more than 10 points higher than before, and the S grade of the third scavenging tailings can be reduced from about 2.2% to 1.4%, which can significantly improve the flotation desulfurization effect. It shows that under the condition of single flotation, using flotation desliming is beneficial to flotation desulfurization.

[0089] Comparative Example 4:

[0090] Compared with Comparative Example 3, the only difference is that sodium sulfide is added as a sulfidizing agent, and the dosage is 200 g / t of feed. The S grade of the flotation tailings is 0.51%, and the S operating recovery rate is 5.83%. It can be seen that the S grade and recovery rate of the tailings obtained by using copper sulfate (combined with sodium sulfide) activator flotation are the lowest, and the flotation desulfurization effect is the best.

[0091] Comparative Example 5:

[0092] The -100 to +200 mesh screening product 4 obtained by screening in step (4) of Example 1 was used to investigate the separation effect of flotation desulfurization-quartz reverse flotation, and the experimental flowcharts are shown in Figure 5

[0093] Ball milling: the -100 to +200 mesh screening product 4 was ball milled for 15 s to obtain a ball-milled product; the ball-milled product was subjected to “one roughing and three scavenging → reverse flotation” experiment;

[0094] The roughing was added with the reagents in turn: copper sulfate 200 g / t of feed, butyl xanthate 200 g / t of feed + ammonium black 100 g / t of feed, No. 2 oil 60 g / t of feed; the roughing tailings were taken for the first scavenging;

[0095] The first scavenging was added with the reagents: copper sulfate 100 g / t of feed, butyl xanthate 100 g / t of feed + ammonium black 50 g / t of feed, No. 2 oil 30 g / t of feed; the first scavenging tailings were taken for the second scavenging;

[0096] The second scavenging was added with the reagents: butyl xanthate 50 g / t of feed + ammonium black 25 g / t of feed, No. 2 oil 15 g / t of feed; the second scavenging tailings were taken for the third scavenging;

[0097] The third scavenging was added with the reagents: butyl xanthate 25 g / t of feed + ammonium black 12.5 g / t of feed, No. 2 oil 15 g / t of feed; the third scavenging tailings were taken for the reverse flotation;

[0098] ​Reverse flotation: sodium oleate 200 g / t feed, No. 2 oil 60 g / t feed; obtain siliceous raw materials and tailings, tailings are discarded. The slurry of the combined roughing, first scavenging, second scavenging and third scavenging except tailings is obtained to obtain a sulfur-containing product. The siliceous raw material yield is 7.21%, the Si, S and Sn grades are 36.76%, 0.26% and 0.13% respectively, the yield of the sulfur-containing product is 2.57, and the grade is 35.10%, all of which are lower than the gravity desulfurization-quartz reverse flotation process of the scheme of the application in Example 1. It is proved that the gravity-flotation combined process of the application has excellent performance in recovering siliceous materials and sulfur concentrates.

[0099] In this embodiment, the main purpose of roughing is to remove large pieces of ore and inclusions, and to improve the grade and recovery rate of the ore. The roughing method is gravity separation, which separates the ore and gangue by the difference in specific gravity. The roughing equipment mainly includes spiral classifier, jig, shaking table, etc.

[0100] The main purpose of cleaning is to remove fine-grained ore and inclusions, and to improve the grade and recovery rate of the ore. The cleaning method is magnetic separation, which separates the ore and magnetic minerals by the difference in magnetism. The cleaning equipment mainly includes permanent magnet drum magnetic separator, disc type magnetic separator, electromagnetic magnetic separator, etc.

[0101] The main purpose of scavenging is to remove low-grade ore and waste rock, and to improve the grade and recovery rate of the ore. The scavenging method is screening, which separates the ore and the screen by the difference in screening. The scavenging equipment mainly includes vibrating screen, drum screen, hydrocyclone, etc.

[0102] The tailings still contain useful components that are difficult to extract due to the current technical level, but may become raw materials for reuse in the future. Therefore, tailings are generally stored in a tailings pond. The intermediate product obtained in the beneficiation process is called middlings, and the useful part of the middlings generally has a content between that of the concentrate and the tailings.

[0103] The above examples are only specific examples for further detailing the purpose, technical solutions and beneficial effects of the application, and the application is not limited to this. Any modification, equivalent replacement, improvement, etc. within the scope disclosed in the application is included in the protection scope of the application.

Claims

1. A method for grading and quality resource utilization of tin mine tailings, characterized in that, The method comprises the following steps: (1) screening the tin mine tailings by using a 60-mesh screen to obtain +60-mesh and -60-mesh screening products 1, and screening the -60-mesh screening products 1 by using a 100-mesh screen to obtain -60-mesh to +100-mesh and -100-mesh screening products 2; (2) performing cyclic rod milling on the +60-mesh screening products 1 of step (1), and then sequentially passing through a 60-mesh screen and a 100-mesh screen to obtain +60-mesh, -60-mesh to +100-mesh and -100-mesh screening products 3; (3) combining the -60-mesh to +100-mesh screening products 2 obtained in step (1) and the -60-mesh to +100-mesh screening products 3 obtained in step (2), and then performing table concentration to obtain table concentrate and table tailings 1; combining the table tailings 1 with the +60-mesh screening products 3 to obtain coarse-grained siliceous products; (4) combining the -100-mesh screening products 2 obtained in step (1) and the -100-mesh screening products 3 obtained in step (2), and then screening through a 200-mesh screen to obtain -100-mesh to +200-mesh and -200-mesh screening products 4; (5) performing table concentration and middlings re-concentration on the -100-mesh to +200-mesh screening products 4 obtained in step (4) to obtain table tailings 2 and a sulfur-containing tin-containing concentrate; (6) performing reverse flotation of quartz on the table tailings 2 of step (5) to obtain a flotation concentrate as a cement siliceous raw material; (7) performing flotation desulfurization on the sulfur-containing tin-containing concentrate obtained in step (5) to obtain a sulfur concentrate and a tin-containing tailings.

2. The method for grading and quality utilization of tin mine tailings according to claim 1, characterized in that: In the tin mine tailings, the mass content of Si is 29-35%, the mass content of S is less than 3%, and the mass content of Sn is less than 0.1%.

3. The method for grading and quality utilization of tin mine tailings according to claim 2, characterized in that: In the tin mine tailings, the mass content of Si is 29-30%, the mass content of Ca is 10-12%, the mass content of S is 2-2.7%, the mass content of As is 0.4-0.5%, the mass content of Sn is 0.03-0.05%, the mass content of Fe is 3.3-3.4%, the mass content of K is 1.1-1.2%, and the balance is inevitable impurities.

4. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step (1), the yield of +100-mesh screening products is required to be greater than 75%, the mass content of SiO2 is greater than 65%, the mass content of S is 1.3-1.5%, and the mass fraction of the total amount of potassium oxide and sodium oxide is less than 5%; the +100-mesh screening products are +60-mesh screening products 1 and -60-mesh to +100-mesh screening products 2.

5. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step (2), the first rod milling time of the cyclic rod mill is 4-6 minutes, and the subsequent rod milling time is 2-3 minutes; after each rod milling, the rod milling product is screened by using a 60-mesh screen, and the screened product is returned to the rod mill; when the total yield of the screened product is less than 15%, the cyclic rod milling is stopped.

6. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step (3), the process conditions of the table concentration are as follows: stroke 1.2-2.0 cm, stroke frequency 300-350 times / min, bed surface transverse slope 1°30″-3°30″, and feed mass concentration 15%-25%.

7. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step 5), the process conditions of the shaking table re-ore re-shaking process are as follows: stroke 0.8-1.5 cm, stroke frequency 320-380 times / min, bed surface transverse slope 1°30''-3°30'', and ore mass concentration 15%-25%.

8. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step 6), the ore mass concentration of the quartz reverse flotation is 30%-40%; the reagents added in the quartz reverse flotation in turn are: collector sodium oleate 200-300 g / t·ore, frother No. 2 oil 50-100 g / t·ore; in the quartz reverse flotation process, the collector is added and stirred for 2-4 minutes, the frother is added and stirred for 1-3 minutes, and the skimming time is 3-5 minutes.

9. The method for grading and quality-based resource utilization of tin mine tailings according to claim 1, characterized in that: In step 7), the flotation desulfurization comprises the following steps: (a) ball milling the gravity separation sulfur-containing tin-containing concentrate to obtain a ball-milled product, the ball milling time being 15-30 s; (b) roughing the ball-milled product to obtain a roughing concentrate and a roughing tailing; the reagents added in the roughing in turn are: sodium sulfide 200-300 g / t·ore, copper sulfate 200-400 g / t·ore, butyl xanthate 50-100 g / t·ore + butyl ammonium black drug 25-50 g / t·ore, and No. 2 oil 60-100 g / t·ore; (c) first scavenging the roughing tailing to obtain a first scavenging concentrate and a first scavenging tailing; the first scavenging concentrate is returned to step (b) and combined with the ball-milled product of the next round to perform roughing; the reagents added in the first scavenging in turn are: copper sulfate 100-200 g / t·ore, butyl xanthate 25-50 g / t·ore + butyl ammonium black drug 15-25 g / t·ore, and No. 2 oil 30-50 g / t·ore; (d) second scavenging the first scavenging tailing to obtain a second scavenging concentrate and a second scavenging tailing; the second scavenging concentrate is returned to step (c) and combined with the roughing tailing of the next round to perform first scavenging; the reagents added in the second scavenging in turn are: butyl xanthate 15-25 g / t·ore + butyl ammonium black drug 10-15 g / t·ore, and No. 2 oil 15-25 g / t·ore; (e) third scavenging the second scavenging tailing to obtain a third scavenging concentrate and a third scavenging tailing; the third scavenging concentrate is returned to step (d) and combined with the first scavenging tailing of the next round to perform second scavenging; the third scavenging tailing is used as a tin-containing tailing; the reagents added in the third scavenging in turn are: butyl xanthate 5-15 g / t·ore + butyl ammonium black drug 5-10 g / t·ore, and No. 2 oil 5-15 g / t·ore; (f) sulfur concentration of the roughing concentrate to obtain a sulfur concentrate and a concentration tailing; the concentration tailing is returned to step (b) and combined with the ball-milled product of the next round to perform roughing; the sulfur concentration does not add reagents.

10. The method for grading and quality utilization of tin mine tailings according to claim 9, characterized in that: In the flotation desulfurization, the stirring time after adding No. 2 oil is 1-3 minutes, and the stirring time after adding each kind of reagent is 2-4 minutes; the roughing skimming time is 3-5 minutes; the skimming time of the first scavenging, the second scavenging, the third scavenging and the sulfur concentration is 2-4 minutes.

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