Classification and quality-based resource utilization method for tin mine tailings

Abstract

The invention discloses a classification and quality-divided resource utilization method for tin mine tailings, which comprises the following steps of: deeply researching the components of the tin mine tailings with specific raw material properties, and dividing the tin mine tailings raw material into minerals with different particle sizes of + 60 meshes,-60 meshes to + 100 meshes and-100 meshes by utilizing screening classification and circulating rod milling; the method comprises the following steps: treating minerals with the particle size of-60 to + 100 meshes by adopting a shaking table reselection process to recover coarse-grain siliceous products, and removing impurities by adopting a re-grading-reselection-flotation combined process, so that the products respectively reach the related standards of building materials and cement raw materials, and finally, the coarse-grain products are used for silicate building product sand. And the medium-fine grain product is used as a cement ingredient siliceous raw material, S and tin in the tailings are recycled at the same time, and finally resource utilization of the tin mine tailings is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of comprehensive recovery and utilization of tailings resources, and in particular relates to a method for resource utilization of tin mine tailings according to grade and quality. Background Art

[0002] The large-scale storage of tin tailings not only occupies land resources, but also causes environmental pollution, safety hazards, waste of valuable resources and other problems, thus seriously restricting the development of the tin industry.

[0003] Due to the different ore deposit conditions and geological causes of tin mines in various places, and different mineral processing processes, the properties of the tin tailings produced are also different, but they 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, based on the analysis of the properties of different tin tailings, it is very important to study and promote the comprehensive recycling and utilization of tin tailings resources. This is of great significance to solving the large-scale storage of tailings, reducing the waste of valuable resources, improving economic benefits, protecting the environment, and promoting the sustainable development of the tin industry. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is:

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

[0007] (1) Using a 60-mesh screen to screen the tin mine tailings, a screening product 1 of +60 mesh and -60 mesh is obtained; using a 100-mesh screen to screen the -60-mesh screening product 1, a screening product 2 of -60 mesh to +100 mesh and -100 mesh is obtained;

[0008] (2) subjecting the +60 mesh sieved product 1 of step (1) to a circulating rod mill, and then sequentially passing through a 60 mesh sieve and a 100 mesh sieve to obtain sieved products 3 of +60 mesh, -60 mesh to +100 mesh, and -100 mesh;

[0009] (3) combining the -60-mesh to +100-mesh screening product 2 obtained in step (1) and the -60-mesh to +100-mesh screening product 3 obtained in step (2), and then performing table gravity separation to obtain a table concentrate and a table tailing 1; combining the table tailing 1 with the +60-mesh screening product 3 to obtain a coarse-grained siliceous product; and performing waste treatment on the table concentrate;

[0010] (4) combining the -100 mesh sieved product 2 obtained in step (1) and the -100 mesh sieved product 3 obtained in step (2), and sieving through a 200 mesh sieve to obtain -100 mesh to +200 mesh and -200 mesh sieved products 4;

[0011] (5) subjecting the -100-+200 mesh sieved product 4 obtained in step (4) to table gravity separation and re-shaking of the middlings to obtain table tailings 2 and gravity separation sulfur-containing and tin-containing concentrates; the table gravity separation and re-shaking of the middlings are to take out the middlings obtained in the table gravity separation in this step, add them to the table for gravity separation for a second time without discarding the concentrate and tailings, and finally obtain table tailings 2 and gravity separation sulfur-containing and tin-containing concentrates;

[0012] (6) subjecting the shaking table tailings 2 of step (5) to quartz reverse flotation to obtain flotation concentrate as cement siliceous raw material; and the flotation tailings are disposed of as waste;

[0013] (7) flotation desulfurization is performed on the re-selected sulfur-containing and tin-containing concentrate obtained in step (5) to obtain a sulfur concentrate and a tin-containing tailings.

[0014] As a further technical solution, in the above-mentioned 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%.

[0015] As a further technical solution, in the above-mentioned 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 remainder is unavoidable impurities.

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

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

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

[0019] As a further technical solution, in the above step (5), the process conditions of the shaking table gravity separation-middensity re-shaking are: stroke 0.8-1.5 cm, stroke frequency 320-380 times / min, bed surface lateral slope 1°30″~3°30″, feed ore mass concentration 15%~25%.

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

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

[0022] (a) ball milling and activating the re-selected sulfur-containing and tin-containing concentrate for 15 to 30 seconds 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 are: sodium sulfide 200-300 g / t·feed ore, copper sulfate 200-400 g / t·feed ore, butyl xanthate 50-100 g / t·feed ore + butyl ammonium black powder 25-50 g / t·feed ore, and No. 2 oil 60-100 g / t·feed ore;

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

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

[0026] (e) performing a third scavenging of the scavenging tailings II to obtain scavenging concentrate III and scavenging tailings III; returning the scavenging concentrate III to step (d) and combining it with the next round of scavenging tailings I for a second scavenging; the scavenging tailings III are used as tin-containing tailings; the reagents added in the third scavenging are: 5-15 g / t of butyl xanthate·feed ore+5-10 g / t of butyl ammonium black powder·feed ore, and 5-15 g / t of No. 2 oil·feed ore;

[0027] (f) sulfur concentration is performed on the roughing concentrate to obtain sulfur concentrate and concentrated tailings; the concentrated tailings are returned to step (b) and combined with the product after the next round of ball milling for roughing; no reagent is added in the sulfur concentration.

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

[0029] It should be noted that the particle size of the present invention is represented by "+" and "-" to indicate the relationship between the upper and lower sizes, for example, +60 mesh refers to the upper size of the 60 mesh screen, -60 mesh refers to the lower size of the 60 mesh screen, -60 mesh to +100 mesh refers to the lower size of the 60 mesh screen and the upper size of the 100 mesh screen. The aperture of the 60 mesh screen is 0.25 mm, the aperture of the 100 mesh screen is 0.15 mm, and the aperture of the 200 mesh screen is 0.075 mm.

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

[0031] 1. The present invention is mainly used to treat tin mine tailings with low metal content and high silicon component. The main minerals of such tailings are quartz, calcite, feldspar and pyrite. The invention conducts in-depth research on the components of tin mine tailings with specific raw material properties, divides the tin mine tailings raw materials into minerals of different particle sizes of +60 mesh, -60 mesh to +100 mesh and -100 mesh by screening and grading and circulating rod mill, adopts a shaking table gravity separation process to process the -60 mesh to +100 mesh particle size minerals to recover coarse siliceous products, removes impurities by a re-grading-gravity separation-flotation combined process, and makes the products meet the relevant standards of building materials and cement raw materials respectively, finally realizes that the coarse-grained products are used for sand for silicate building products, the medium-fine-grained products are used for siliceous raw materials for cement ingredients, and S and tin in the tailings are recovered at the same time, finally realizes the resource utilization of the tin mine tailings, the obtained coarse-grained siliceous products can meet the qualified product requirements for sand for building products, and the yield reaches 45-60%; the obtained cement siliceous raw materials can meet the product requirements, and the yield reaches 10-15%; the obtained sulfur concentrate S grade can reach 28-33%, and the yield reaches 3-6%.

[0032] 2. The present invention greatly reduces the discharge of tailings through comprehensive recovery of tin mine tailings, which is not only green and environmentally friendly, but also reduces the cost of tailings treatment and improves economic benefits;

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

[0034] Figure 1 It is a schematic diagram of the process of the present invention;

[0035] Figure 2 This is a schematic diagram of the process of Example 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of the raw material-100 mesh sludge desulfurization flotation experiment process of Comparative Example 2 of the present invention;

[0037] Figure 4 This is a schematic diagram of the raw material-100 mesh sludge desludging-desulfurization flotation experiment process of Comparative Example 3 of the present invention;

[0038] Figure 5 This is a schematic diagram of the experimental process of flotation desulfurization-quartz reverse flotation of raw material -100 mesh to +200 mesh samples in comparative example 5 of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with examples, but the implementation mode of the present invention is not limited to the scope represented by the examples.

[0040] The raw material used in this embodiment is the tailings of the tin mine of a tin ore dressing plant in Guangxi. 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 relatively low, and the significance of directly recovering valuable metals is not great. The siliceous component content in the raw material is relatively high, and after separation and enrichment, harmful impurities (sulfur and arsenic) are removed and can be used for building materials such as sandstone, cement raw materials.

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

[0042]

[0043] According to the grade requirements of qualified silicate building sand products in the recommended standard JC / T 622-2009 of the building materials industry, the mass fraction of silicon dioxide is ≥65%, the mass fraction of potassium oxide + sodium oxide is ≤5.0%, the mass fraction of mica is ≤1.0%, and the mass fraction of sulfide and sulfate (as SO 3) mass fraction ≤ 2.0%, mud content ≤ 8.0%, moisture content ≤ 8.0%. As the main auxiliary raw material for producing silicate cement clinker, the general requirements for siliceous raw materials are SiO 2 The content is above 75%. When firing low-alkali cement clinker, the R content of silicon-aluminum raw materials is generally required to be 2 O(K 2 O+Na 2 O)≤2.0%, MgO≤3%, SO 3 ≤2%. The present invention mainly processes samples according to the above standards, so that the product can be flexibly applied to the production of cement clinker of different types and processes.

[0044] Embodiment 1:

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

[0046] (1) The obtained tin mine tailings are screened with a sieve with a mesh size of 60 mesh to obtain +60 mesh and -60 mesh screening products 1; then the -60 mesh screening product 1 is screened with a sieve with a mesh size of 100 mesh to obtain -60 to +100 mesh screening products 2 and -100 mesh screening products 2; in this step, the yield of the +100 mesh coarse particle screening product is 76.74%, wherein the Si content is greater than 30.3% (SiO 2 The content of S is greater than 65%), and the content of S is 1.31% to 1.43% (equivalent to SO 3 The content of potassium oxide is 3.28-3.58%), the content of potassium oxide is 1.11%, the content of sodium oxide is 0.03%, and the mass fraction of potassium oxide + sodium oxide is less than 5%. The coarse-grained screening product of +100 mesh includes the screening product 1 of +60 mesh and the screening product 2 of -60 mesh to +100 mesh;

[0047] (2) the +60 mesh screened product 1 obtained in step (1) is 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 milled product is screened with a 60 mesh sieve, and the screened product is returned to the rod mill until the screened product yield is less than 15%, and the circulating rod milling is terminated; after the rod milling is completed, the product is screened with a 60 mesh sieve and a 100 mesh sieve in turn to obtain a +60 mesh screened product 3, a -60 to +100 mesh screened product 3, and a -100 mesh screened product 3;

[0048] (3) combining the -60-+100 mesh screening product 2 obtained in step (1) with the -60-+100 mesh screening product 3 obtained in step (2), and then performing a shaking table gravity separation, wherein the process conditions of the shaking table gravity separation are: a stroke of 1.2-2.0 cm, a stroke of 300-350 times / min, a bed surface transverse slope of 1°30″, and a feed mass concentration of 20%, to obtain a shaking table tailing 1 and a shaking table concentrate; combining the shaking table tailing with the +60 mesh screening product 3 to obtain a coarse-grained siliceous product;

[0049] (4) combining the -100 mesh sieved product 2 obtained in step (1) and the -100 mesh sieved product 3 obtained in step (2), and sieving through a 200 mesh sieve to obtain a -100 to +200 mesh sieved product 4 and a -200 mesh sieved product 4;

[0050] (5) The -100 to +200 mesh sieved product 4 obtained in step (4) is subjected to a shaking table gravity separation-middling re-shaking process, wherein the process conditions of the shaking table gravity separation-middling re-shaking are: a stroke of 0.8 to 1.5 cm, a stroke of 320 to 380 times / min, a bed surface transverse slope of 1°30″, and a feed mass concentration of 20%, thereby obtaining a shaking table tailing 2 and a gravity separation sulfur-containing and tin-containing concentrate;

[0051] (6) quartz reverse flotation is performed on the shaking table tailings 2 obtained in step (5), sodium oleate is used as a collector, and the reverse flotation feed mass concentration is 30%; sodium oleate collector is added to the slurry in an amount of 200 g / t·feed, stirred for 3 minutes, and then No. 2 oil is added as a frother in an amount of 60 g / t·feed, stirred for 1 minute, and scraped for 4 minutes, and a flotation concentrate is obtained by reverse flotation as a cement siliceous raw material; the flotation tailings are disposed of as waste;

[0052] (7) flotation desulfurization is performed on the re-selected sulfur-containing tin concentrate obtained in step (5) to obtain a sulfur concentrate and a tin-containing tailings. The flotation desulfurization comprises the following steps: the re-selected sulfur-containing tin concentrate is firstly subjected to a short-time ball milling activation in a ball mill, the ball milling time is 15 seconds, and then a flotation operation of one coarse, one fine and three sweeps is performed, specifically:

[0053] (a) ball milling and activating the re-selected sulfur-containing and tin-containing concentrate for 15 seconds to obtain a ball milled product;

[0054] (b) roughing the ball-milled product to obtain a roughing concentrate and a roughing tailing; the reagents added in the roughing are: 200 g / t sodium sulfide·feed, 200 g / t copper sulfate·feed, 100 g / t butyl xanthate·feed + 50 g / t butyl ammonium black powder·feed, and 60 g / t No. 2 oil·feed;

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

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

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

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

[0059] In the flotation operation of one roughing, one fine and three sweeping, the stirring time after adding each agent except No. 2 oil frother is 3 minutes; the stirring time after adding the frother is 1 minute; the roughing scraping time is 4 minutes; the first sweeping, second sweeping, third sweeping and sulfur fine sweeping are 3 minutes respectively.

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

[0061] The coarse siliceous product consists of the following two parts: 1) The S content of the +60 mesh screened product 3 is reduced to 0.53% (equivalent to SO 3 The content of S in the shaking table tailings is 0.69% (equivalent to SO 3 The content is 1.725%, <2%), and the yield is 44.02%.

[0062] The total yield of coarse-grained siliceous products is 50.10%, the sulfur content is 0.67%, the fine-grained modulus is 1.46, it is a very fine sand, and the loose bulk density is 1280g / cm 3 , compact density is 1390g / cm 3, which meets the requirements for qualified sand used in building products.

[0063] The yield of cement siliceous raw material is 7.59%, the grade of Si is 37.31%, and the grade of S is 0.18%, which meets the product requirements of cement siliceous raw material.

[0064] The yield of sulfur concentrate is 4.89% and the S grade is 29.66%.

[0065] The tin grade in the tin-containing tailings is 0.3%, and its recovery value is low, so it is treated as tailings disposal.

[0066] Screening of coarse siliceous products

[0067] Comparative Example 1:

[0068] In this comparative example, the rod mill treatment in step (2) is not adopted. The -60-+100 mesh sieved product 2 obtained in step (1) of Example 1 is directly sieved through an 80-mesh sieve. The obtained -60-+80 mesh and -80-+100 mesh samples are then re-selected using a shaking table, respectively. The obtained shaking table tailings are coarse-grained siliceous product 1 and coarse-grained siliceous product 2.

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

[0070] The coarse particle desulfurization cannot be directly achieved for the -60 to +80 mesh and -80 to +100 mesh samples obtained by original screening, which is caused by the incomplete dissociation of the sulfide ore.

[0071] This shows that the present invention uses a rod mill to perform a cyclic rod mill treatment on the +60 mesh screening product 1, and performs reasonable classification, merging, and shaking table gravity selection, which are excellent in technology.

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

[0073] Comparative Example 2:

[0074] A "one coarse three sweep" desulfurization experiment was carried out on the -100 mesh screening product 2 obtained in step (1) and the -100 mesh screening product 3 obtained in step (2) in Example 1 to investigate the desulfurization effect of flotation. The experimental flow chart is shown in FIG. Figure 3 As shown:

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

[0076] The reagents added in the first scavenging are: "activator variable", 100g / t of butyric acid, and 30g / t of No. 2 oil; the activation schemes adopted by the "activator variable" are 200g / t of copper sulfate, 400g / t of sulfuric acid, and 200g / t of copper sulfate + 200g / t of sulfuric acid; the intermediate ore 1 and the first scavenging tailings are obtained, and the first scavenging tailings enter the second scavenging;

[0077] The reagents added in the second scavenging are: 50g / t of butyl yellow medicine·feed ore, 15g / t of No. 2 oil·feed ore; the second scavenging ore and the second scavenging tailings are obtained;

[0078] The reagents added in the third scavenging are: 25g / t of butyl yellow medicine and 15g / t of No. 2 oil; the ore from the third scavenging and the tailings from the third scavenging are obtained.

[0079] The middle ore from the second sweep and the middle ore from the third sweep are combined to obtain middle ore 2.

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

[0081] When copper sulfate is used as the sole activator, the S recovery rate in the rougher concentrate is 40.28%, and the S grade in the third scavenging tailings is reduced to 2.15%.

[0082] When sulfuric acid is used as the sole activator, the S recovery rate in the rougher concentrate is 51.18%, and the S grade in the third scavenging tailings is reduced to 2.24%.

[0083] When copper sulfate and sulfuric acid are mixed, the sulfur content and grade of the desulfurized tailings are higher than those of a single activator. However, the sulfur content does not meet the sulfur content requirements of the siliceous raw materials of cement batching.

[0084] The comparative example illustrates that the process of recovering siliceous cement raw materials by "classification - shaking table gravity separation - middling re-shaking - quartz reverse flotation" of this 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 deslimed by flotation before roughing. The experimental flow chart is as follows: Figure 4 As shown:

[0087] Desliming: The dosage of No. 2 oil is 60g / t·feeding ore, the stirring time is 3 minutes, and the desliming flotation time is 5 minutes.

[0088] After adding the flotation desludging process, the loss rate of S in the flotation sludge is very low, only about 1%. When the copper sulfate dosage is 200g / t·feed, the S operation recovery rate of the roughing concentrate is 64.43%, and the S grade reaches 35.41%. The S operation recovery rate of the concentrate has increased by more than 10 points compared with 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, the use of flotation desludging 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 sulfiding agent, and its dosage is 200g / t·feed ore. The S grade of the flotation tailings is 0.51%, and the S recovery rate is 5.83%. It can be seen that the S grade and recovery rate of the tailings obtained by flotation using copper sulfate (used in combination with sodium sulfide) as an activator 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 investigated for the separation effect of flotation desulfurization-quartz reverse flotation. The experimental flow charts are as follows: Figure 5 As shown:

[0093] Ball milling: ball mill the -100 to +200 mesh sieved product for 15 seconds to obtain the ball milled product; conduct a "one roughing three sweeping → reverse flotation" experiment on the ball milled product;

[0094] The reagents added in the roughing are: copper sulfate 200g / t·feed ore, butyl xanthate 200g / t·feed ore + butyl ammonium black powder 100g / t·feed ore, No. 2 oil 60g / t·feed ore; the roughing tailings are taken to the first sweeping;

[0095] The reagents added in the first scavenging are: copper sulfate 100g / t·feed ore, butyl xanthate 100g / t·feed ore + butyl ammonium black powder 50g / t·feed ore, No. 2 oil 30g / t·feed ore; the tailings of the first scavenging are taken to the second scavenging;

[0096] The reagents added in the second scavenging are: butyl xanthate 50g / t·feed ore + butyl ammonium black powder 25g / t·feed ore, and No. 2 oil 15g / t·feed ore; the tailings from the second scavenging are taken to the third scavenging;

[0097] The reagents added in the third scavenging are: 25g / t of butyl xanthate, 12.5g / t of butyl ammonium black powder, and 15g / t of No. 2 oil. The tailings from the third scavenging are sent to reverse flotation.

[0098] Reverse flotation: 200g / t sodium oleate·feed, 60g / t No. 2 oil·feed; obtain siliceous raw materials and tailings, and discard the tailings. Combine the sludge except tailings from roughing, first scavenging, second scavenging and third scavenging to obtain sulfur-containing products. The yield of siliceous raw materials is 7.21%, and the grades of Si, S and Sn are 36.76%, 0.26% and 0.13% respectively. The yield of sulfur-containing products is 2.57 and the grade is 35.10%. All indicators are lower than the gravity desulfurization-quartz reverse flotation process of the present invention in Example 1. It proves the superiority of the gravity-flotation combined process of the present invention 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. Roughing adopts gravity separation, which uses the difference in specific gravity between ore and gangue for separation. Roughing equipment mainly includes spiral classifier, jig, shaking table, etc.

[0100] The main purpose of concentration is to remove fine-grained ore and inclusions, and to improve the grade and recovery rate of the ore. Concentration uses magnetic separation, which uses the magnetic difference between ore and magnetic minerals for separation. Concentration equipment mainly includes permanent magnetic drum magnetic separator, disc magnetic separator, electromagnetic magnetic separator, etc.

[0101] The main purpose of scavenging is to remove low-grade ore and waste rock, and improve the grade and recovery rate of ore. Scavenging adopts the screening method, which uses the screening difference between ore and screen to separate. 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 they may become raw materials for reuse in the future. Therefore, the tailings are generally stored in tailings ponds. The intermediate product obtained in the selection process is called middlings, and the useful content of middlings is generally between concentrates and tailings.

[0103] The above embodiments are only specific examples for further describing the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope disclosed by the present invention are included in the protection scope of the present invention.

Claims

1. A method for resource utilization of tin mine tailings by classification and quality, characterized in that: The following steps are involved: (1) The 60-mesh screen is used to screen the tin mine tailings to obtain a screening product 1 of +60 mesh and -60 mesh; the -60-mesh screen 1 is screened with a 100-mesh screen to obtain a screening product 2 of -60 mesh to +100 mesh and -100 mesh; (2) subjecting the +60 mesh sieved product 1 of step (1) to a circulating rod mill, and then sequentially passing through a 60 mesh sieve and a 100 mesh sieve to obtain sieved products 3 of +60 mesh, -60 mesh to +100 mesh, and -100 mesh; (3) combining the -60-mesh to +100-mesh screening product 2 obtained in step (1) and the -60-mesh to +100-mesh screening product 3 obtained in step (2), and then performing table gravity separation to obtain table concentrate and table tailings 1; combining the table tailings 1 and the +60-mesh screening product 3 to obtain a coarse-grained siliceous product; (4) combining the -100 mesh sieved product 2 obtained in step (1) and the -100 mesh sieved product 3 obtained in step (2), and sieving through a 200 mesh sieve to obtain -100 mesh to +200 mesh and -200 mesh sieved products 4; (5) subjecting the -100-+200 mesh sieved product 4 obtained in step (4) to table gravity separation and re-shaking of the middlings to obtain table tailings 2 and gravity separation sulfur-containing and tin-containing concentrates; (6) subjecting the shaking table tailings 2 of step (5) to quartz reverse flotation to obtain flotation concentrate as cement siliceous raw material; (7) The re-selected sulfur-containing and tin-containing concentrate obtained in step (5) is subjected to flotation desulfurization to obtain a sulfur concentrate and a tin-containing tailings.

2. The method for resource 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 resource 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 remainder is unavoidable impurities.

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

5. The method for resource utilization of tin mine tailings by classification and quality classification according to claim 1 is characterized by: In step (2), the first rod grinding time of the circulating rod mill is 4 to 6 minutes, and the subsequent rod grinding time is 2 to 3 minutes; after each rod grinding, the rod grinding product is sieved 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 circulating rod grinding is stopped.

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

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

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

9. The method for resource utilization of tin mine tailings by classification and quality classification according to claim 1, characterized in that: In step (7), the flotation desulfurization comprises the following steps: (a) ball milling and activating the re-selected sulfur-containing and tin-containing concentrate for 15 to 30 seconds to obtain a ball milled product; (b) roughing the ball-milled product to obtain a roughing concentrate and a roughing tailing; the reagents added in the roughing are: sodium sulfide 200-300 g / t·feed ore, copper sulfate 200-400 g / t·feed ore, butyl xanthate 50-100 g / t·feed ore + butyl ammonium black powder 25-50 g / t·feed ore, and No. 2 oil 60-100 g / t·feed ore; (c) The roughing tailings are subjected to a first scavenging to obtain scavenging concentrate I and scavenging tailings I; the scavenging concentrate I is returned to step (b) and combined with the product after the next round of ball milling for roughing; the reagents added in the first scavenging are: copper sulfate 100-200 g / t·feed ore, butyl xanthate 25-50 g / t·feed ore + butyl ammonium black powder 15-25 g / t·feed ore, and No. 2 oil 30-50 g / t·feed ore; (d) performing a second scavenging of the scavenging tailings I to obtain scavenging concentrate II and scavenging tailings II; returning the scavenging concentrate II to step (c) and combining it with the next round of roughing tailings to perform the first scavenging; the reagents added in the second scavenging are: 15-25 g / t of butyl xanthate·feed ore+10-15 g / t of butyl ammonium black powder·feed ore, and 15-25 g / t of No. 2 oil·feed ore; (e) The scavenging tailings II are scavenged for the third time to obtain scavenged concentrate III and scavenged tailings III; the scavenged concentrate III is returned to step (d) and combined with the next round of scavenged tailings I for the second scavenging; the scavenged tailings III are used as tin-containing tailings; the reagents added in the third scavenging are: 5-15 g / t of butyl xanthate·feed ore+5-10 g / t of butyl ammonium black powder·feed ore, and 5-15 g / t of No. 2 oil·feed ore; (f) sulfur concentration is performed on the rougher concentrate to obtain a sulfur concentrate and concentrated tailings; the concentrated tailings are returned to step (b) and combined with the product after the next round of ball milling for rougher concentration; no reagent is added in the sulfur concentration.

10. The method for resource 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 to 3 minutes, and the stirring time after adding each of the other reagents is 2 to 4 minutes; the scraping time for roughing is 3 to 5 minutes; the scraping time for the first scavenging, second scavenging, third scavenging and sulfur concentration is 2 to 4 minutes.

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