A method for resource recovery from low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents

Abstract

This invention discloses a method for recovering low-grade tin polymetallic ore tailings resources based on the synergistic effect of combined reagents, comprising the following steps: (1) grinding the tailings and adjusting the slurry concentration and pH value, then adding lead-antimony flotation reagents to the slurry for flotation to obtain lead-antimony concentrate and first flotation tailings slurry; (2) adding zinc flotation reagents to the first flotation tailings slurry for flotation to obtain zinc concentrate and second flotation tailings slurry; (3) performing roughing shaking table operation on the second flotation tailings slurry to obtain roughing tailings slurry and tailings; (4) adding desulfurization flotation reagents to the roughing tailings slurry for flotation to obtain sulfur concentrate and third flotation tailings slurry; (5) performing cleaning shaking table operation on the third flotation tailings slurry to obtain tin concentrate and tailings. This invention's process does not require significant modifications to existing production processes and equipment, not only achieving significant recovery effects for lead and antimony metals but also greatly saving costs.

Description

Technical Field

[0001] This invention relates to a method for recycling low-grade, fine-grained tin polymetallic tailings resources. Based on traditional production processes, it modifies the reagent formulation and applies it to the recycling of low-grade, fine-grained tin polymetallic tailings resources to achieve predetermined production targets. Background Technology

[0002] With the gradual depletion of mineral resources and the recovery of non-ferrous metal prices, low-grade, fine-grained tin polymetallic tailings resources, which were previously considered unrecoverable, have once again come into the public eye. The following table shows the tailings particle size analysis results obtained through on-site raw material sampling and analysis.

[0003]

[0004] As can be seen from the table, the main useful components are concentrated in the -0.037mm particle size fraction.

[0005] For the portion containing -0.037mm particles, which accounts for 65%-70%, settling and recycling are difficult, making recovery relatively challenging. Under the original production process and reagent regime, the recovery rates for tin, zinc, and lead + antimony metals were 30%, 58.1%, and 35.2%, respectively, with the lead + antimony recovery rate remaining low. For older concentrators, the process flow is relatively fixed and cannot be effectively changed in the short term. Currently, in the beneficiation of tin polymetallic ore, the separation of lead and zinc relies to some extent on cyanide, a highly toxic substance that is inconvenient to use and manage, and also poses environmental risks. In conclusion, for the recycling of low-grade, fine-grained tin polymetallic tailings, adjusting the reagent regime based on existing equipment and processes is the most cost-effective and convenient method. Summary of the Invention

[0006] In view of the problems existing in the background technology, the present invention provides a method for recycling low-grade tin polymetallic ore tailings resources based on the synergistic effect of combined agents, so as to achieve not only significant recovery effect of lead and antimony metals, but also greatly save costs.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0008] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0009] (1) Grind the tailings and adjust the slurry concentration and pH value. Then add lead-antimony flotation reagent to the slurry for flotation to obtain lead-antimony concentrate and first flotation tailings slurry.

[0010] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0011] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0012] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0013] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0014] Preferably, in step (1), the tailings are ground to a thickness of -0.074 mm, accounting for 82.3%-88.9%.

[0015] Preferably, in step (1), the slurry concentration is adjusted to 24.7%-28.1%.

[0016] Preferably, in step (1), the pH value of the slurry is adjusted to 6-6.9.

[0017] Preferably, the lead-antimony flotation reagent in step (1) includes 100-200 g / t sulfuric acid, 50-80 g / t sodium sulfite, 20-32 g / t lead-antimony flotation composite collector, 3000-5000 g / t lime, and 200-400 g / t zinc sulfate.

[0018] More preferably, the lead-antimony flotation reagent comprises 160 g / t sulfuric acid, 72 g / t sodium sulfite, 28 g / t lead-antimony flotation composite collector, 4200 g / t lime, and 310 g / t zinc sulfate.

[0019] Preferably, the zinc flotation reagent in step (2) includes 2000-4000 g / t lime, 100-300 g / t copper sulfate, and 300-500 g / t YS-16.

[0020] More preferably, the zinc flotation reagent comprises 3080 g / t lime, 210 g / t copper sulfate, and 406 g / t YS-16.

[0021] Preferably, the desulfurization flotation reagent in step (3) includes 60-100 g / t sulfuric acid, 80-150 g / t copper sulfate, 40-70 g / t butyl xanthate, and 18-25 g / t No. 2 oil.

[0022] More preferably, the desulfurization flotation reagent includes 75 g / t sulfuric acid, 120 g / t copper sulfate, 56 g / t butyl xanthate, and 23 g / t No. 2 oil.

[0023] This invention primarily targets low-grade, fine-grained tin polymetallic tailings resources, utilizing new reagent combinations without altering existing equipment and processes. Specifically, it addresses the reagent regimes for lead-antimony and zinc flotation, achieving predetermined production targets through continuous adjustment of the formulation ratios. The lead-antimony flotation reagent regime is adjusted from lime + ethyl thiocyanate + cyanide to sulfuric acid + sodium sulfite + lead-antimony flotation composite collector + lime + zinc sulfate, with the feed pulp pH adjusted from 8-9 to 6-6.9. The zinc flotation reagent regime is adjusted from lime + copper sulfate + xanthate + sodium humate to lime + copper sulfate + YS-16. Desulfurization flotation and other operations remain unchanged. After using this invention, the recovery rates of tin, zinc, and lead + antimony metals reach at least 28.2%, 57.4%, and 50.6%, respectively, demonstrating the significant effectiveness of this technology in lead + antimony metal recovery. This invention is characterized by the following key features:

[0024] (1) In this invention, the combination of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonylthiourethane plays a synergistic role in improving the recovery rate of lead and antimony metals. This is because 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, and sodium dimercaptosuccinate form complexes with lead and antimony ions, which are adsorbed on the surface of the minerals, effectively improving the hydrophobicity of lead and antimony ore and causing it to float. In addition, the C=S double bond in 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone breaks to form Pb-SCN, with the S atom coordinating with lead-antimony ore. The use of pentyl xanthate and isobutyl ethoxycarbonyl thiourethane increases the N atom concentration in the pulp, effectively optimizing the flotation environment in the pulp, improving the lead-antimony collection effect, and ultimately synergistically improving the lead + antimony metal recovery rate.

[0025] (2) The process of the present invention does not require major modifications to the existing production process and equipment, which can greatly save costs.

[0026] (3) The cyanide process in lead-zinc flotation is to separate lead and zinc by adding cyanide as a selective inhibitor. Although cyanide has a strong inhibitory effect on sphalerite, it is highly toxic. This invention changes the traditional lead-zinc flotation process from a cyanide-containing process to a cyanide-free process, which greatly improves the environmental protection level and is conducive to environmental protection. Attached Figure Description

[0027] Figure 1 This is a production flow diagram of the method for recycling low-grade tin polymetallic ore tailings resources based on the synergistic effect of combined agents according to the present invention.

[0028] Figure 2 This is a production flow diagram of the traditional process for recycling low-grade tin polymetallic ore tailings. Detailed Implementation

[0029] The present invention will now be described with reference to the accompanying drawings, so that those skilled in the art can fully understand the present invention.

[0030] like Figure 1 As shown, a method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0031] (1) Grind the tailings to -0.074mm to account for 82.3%-88.9%, adjust the pulp concentration to 24.7%-28.1%, adjust the pulp pH to 6-6.9, and then add lead-antimony flotation reagents to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0032] The lead-antimony flotation reagents include 100-200 g / t sulfuric acid, 50-80 g / t sodium sulfite, 20-32 g / t lead-antimony flotation composite collector, 3000-5000 g / t lime, and 200-400 g / t zinc sulfate;

[0033] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 5-10:1-2:2.3-3:1.4-1.8:0.4-0.7.

[0034] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0035] The zinc flotation reagents include 2000-4000 g / t lime, 100-300 g / t copper sulfate, and 300-500 g / t YS-16;

[0036] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0037] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0038] The desulfurization flotation reagents include 60-100 g / t sulfuric acid, 80-150 g / t copper sulfate, 40-70 g / t butyl xanthate, and 18-25 g / t No. 2 oil;

[0039] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0040] To make the present invention more fully disclosed, more specific embodiments are described below.

[0041] Example 1

[0042] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0043] (1) Grind the tailings to -0.074mm to 82.8%, adjust the pulp concentration to 25.3%, adjust the pulp pH to 6.2, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0044] The lead-antimony flotation reagents include 110 g / t sulfuric acid, 53 g / t sodium sulfite, 22 g / t lead-antimony flotation composite collector, 3080 g / t lime, and 206 g / t zinc sulfate;

[0045] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 5:1.2:2.3:1.4:0.5.

[0046] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0047] The zinc flotation reagents include 2100 g / t lime, 100 g / t copper sulfate, and 320 g / t YS-16;

[0048] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0049] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0050] The desulfurization flotation reagents include 65 g / t sulfuric acid, 82 g / t copper sulfate, 43 g / t butyl xanthate, and 18 g / t No. 2 oil;

[0051] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0052] Example 2

[0053] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0054] (1) Grind the tailings to -0.074mm to 83.5%, adjust the pulp concentration to 24.7%, adjust the pulp pH to 6.3, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0055] The lead-antimony flotation reagents include 130 g / t sulfuric acid, 50 g / t sodium sulfite, 24 g / t lead-antimony flotation composite collector, 3600 g / t lime, and 220 g / t zinc sulfate;

[0056] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 6:1.4:2.5:1.5:0.6.

[0057] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0058] The zinc flotation reagents include 2100 g / t lime, 140 g / t copper sulfate, and 340 g / t YS-16;

[0059] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0060] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0061] The desulfurization flotation reagents include 70 g / t sulfuric acid, 100 g / t copper sulfate, 55 g / t butyl xanthate, and 21 g / t No. 2 oil;

[0062] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0063] Example 3

[0064] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0065] (1) Grind the tailings to -0.074mm to 85.2%, adjust the pulp concentration to 26.1%, adjust the pulp pH to 6.5, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0066] The lead-antimony flotation reagents include 160 g / t sulfuric acid, 72 g / t sodium sulfite, 28 g / t lead-antimony flotation composite collector, 4200 g / t lime, and 310 g / t zinc sulfate.

[0067] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 8:1.6:2.7:1.5:0.5.

[0068] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0069] The zinc flotation reagents include 3080 g / t lime, 210 g / t copper sulfate, and 406 g / t YS-16;

[0070] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0071] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0072] The desulfurization flotation reagents include 75 g / t sulfuric acid, 120 g / t copper sulfate, 56 g / t butyl xanthate, and 23 g / t No. 2 oil;

[0073] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0074] Example 4

[0075] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0076] (1) Grind the tailings to -0.074mm to 86.1%, adjust the pulp concentration to 26.3%, adjust the pulp pH to 6.4, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0077] The lead-antimony flotation reagents include 170 g / t sulfuric acid, 70 g / t sodium sulfite, 30 g / t lead-antimony flotation composite collector, 4300 g / t lime, and 320 g / t zinc sulfate;

[0078] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 8:1.7:2.5:1.6:0.4.

[0079] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0080] The zinc flotation reagents include 3500 g / t lime, 260 g / t copper sulfate, and 420 g / t YS-16;

[0081] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0082] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0083] The desulfurization flotation reagents include 80 g / t sulfuric acid, 130 g / t copper sulfate, 60 g / t butyl xanthate, and 20 g / t No. 2 oil;

[0084] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0085] Example 5

[0086] A method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents includes the following steps:

[0087] (1) Grind the tailings to -0.074mm to 88.2%, adjust the pulp concentration to 27.8%, adjust the pulp pH to 6.8, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0088] The lead-antimony flotation reagents include 190 g / t sulfuric acid, 75 g / t sodium sulfite, 32 g / t lead-antimony flotation composite collector, 4800 g / t lime, and 400 g / t zinc sulfate;

[0089] The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 9:1.8:2.9:1.8:0.6.

[0090] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0091] The zinc flotation reagents include 4000 g / t lime, 280 g / t copper sulfate, and 470 g / t YS-16;

[0092] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0093] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0094] The desulfurization flotation reagents include 90 g / t sulfuric acid, 140 g / t copper sulfate, 70 g / t butyl xanthate, and 24 g / t No. 2 oil;

[0095] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0096] Comparative Example 1

[0097] The method is basically the same as the method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents in Example 3. The only difference is that the raw materials of the lead-antimony flotation reagents used lack lead-antimony flotation composite collectors. The amount of the missing lead-antimony flotation composite collectors is offset by pure water to keep the total amount of lead-antimony flotation reagents unchanged.

[0098] Comparative Example 2

[0099] The method for recovering low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents is basically the same as that in Comparative Example 1. The only difference is that pentyl xanthate is added to the raw materials of the lead-antimony flotation reagent. The missing amounts of 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiouron are replaced with purified water to keep the total amount of lead-antimony flotation reagent unchanged.

[0100] Comparative Example 3

[0101] The method for recovering low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents is basically the same as that in Comparative Example 1. The only difference is that the raw materials of the lead-antimony flotation reagents used are increased with 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, and sodium dimercaptosuccinate. The missing pentyl xanthate and isobutyl ethoxycarbonyl thiouron are replaced with pure water to keep the total amount of lead-antimony flotation reagents unchanged.

[0102] Comparative Example 4

[0103] The method for recovering low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents is basically the same as that in Comparative Example 1. The only difference is that isobutyl ethoxycarbonyl thiourethane is added to the raw materials of the lead-antimony flotation reagent. The missing pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, and sodium dimercaptosuccinate are replaced with purified water to keep the total amount of lead-antimony flotation reagent unchanged.

[0104] Comparative Example 5

[0105] like Figure 2 As shown, a traditional process for recycling low-grade tin polymetallic ore tailings includes the following steps:

[0106] (1) Grind the tailings to -0.074mm to 85.2%, adjust the pulp concentration to 26.1%, adjust the pulp pH to 8.5, and then add lead-antimony flotation reagent to the pulp for flotation to obtain lead-antimony concentrate and first flotation tailings pulp;

[0107] The lead-antimony flotation reagents include 4200 g / t lime, 80 g / t ethyl thiocyanate, and 45 g / t cyanide;

[0108] (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) and carry out flotation to obtain zinc concentrate and second flotation tailings slurry;

[0109] The zinc flotation reagents include 3080 g / t lime, 210 g / t copper sulfate, 150 g / t butyl xanthate, and 40 g / t sodium humate;

[0110] (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings;

[0111] (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry.

[0112] The desulfurization flotation reagents include 75 g / t sulfuric acid, 120 g / t copper sulfate, 56 g / t butyl xanthate, and 23 g / t No. 2 oil;

[0113] (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine shaking table operation to obtain tin concentrate and tailings.

[0114] The methods of Examples 1-5 and Comparative Examples 1-5 were used to recycle low-grade tin polymetallic ore tailings resources. The lead + antimony metal recovery rates were statistically analyzed, and the results are shown in the table below.

[0115]

[0116]

[0117] As can be seen from the table above: (1) As can be seen from the lead + antimony metal recovery rate data of Examples 1-5, the present invention improves upon the traditional process of recycling low-grade tin polymetallic ore tailings resources, and the lead + antimony metal recovery rate reaches more than 50.6%, which is at least 43.8% higher than the lead + antimony metal recovery rate (35.2%) obtained by the traditional process of recycling low-grade tin polymetallic ore tailings resources (Comparative Example 5). This highlights that the present invention has significant progress compared with the prior art.

[0118] (2) As can be seen from the lead + antimony metal recovery rate data of Example 3 and Comparative Example 2, the lead + antimony metal recovery effect of the lead + antimony flotation composite collector is better than that of the single lead + antimony flotation collector (pentyl xanthate). Although the single lead + antimony flotation collector (pentyl xanthate) can recover lead + antimony metal, the effect is weak.

[0119] (3) As can be seen from the lead + antimony metal recovery data of Example 3 and Comparative Examples 1-4, the combination of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonylthiourethane has a synergistic effect, which synergistically improves the lead + antimony metal recovery rate. This is because 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, and sodium dimercaptosuccinate form complexes with lead and antimony ions, which are adsorbed on the surface of the minerals, effectively improving the hydrophobicity of lead and antimony ore and causing it to float. In addition, the C=S double bond in 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone breaks to form Pb-SCN, with the S atom coordinating with lead-antimony ore. The use of pentyl xanthate and isobutyl ethoxycarbonyl thiourethane increases the N atom concentration in the pulp, effectively optimizing the flotation environment in the pulp, improving the lead-antimony collection effect, and ultimately synergistically improving the lead + antimony metal recovery rate.

[0120] The above content should not be construed as limiting the specific implementation of this invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this invention, and all such deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A method for resource recovery from low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents, characterized in that, Includes the following steps: (1) Grind the tailings and adjust the slurry concentration and pH value. Then add lead-antimony flotation reagent to the slurry for flotation to obtain lead-antimony concentrate and first flotation tailings slurry. (2) Add zinc flotation reagent to the first flotation tailings slurry obtained in step (1) to carry out flotation operation, and obtain zinc concentrate and second flotation tailings slurry; (3) Perform roughing shaking table operation on the second flotation tailings slurry obtained in step (2) to obtain roughing tailings slurry and tailings; (4) Add desulfurization flotation reagent to the rougher tailings slurry obtained in step (3) and carry out flotation to obtain sulfur concentrate and third flotation tailings slurry; (5) The third flotation tailings slurry obtained in step (4) is subjected to a fine-refining shaking table operation to obtain tin concentrate and tailings; In step (1), the tailings are ground to a particle size of -0.074 mm, accounting for 82.3%-88.9%; In step (1), the pulp concentration is adjusted to 24.7%-28.1%; In step (1), the pH of the slurry is adjusted to 6-6.9; The lead-antimony flotation reagents mentioned in step (1) include 100-200 g / t sulfuric acid, 50-80 g / t sodium sulfite, 20-32 g / t lead-antimony flotation composite collector, 3000-5000 g / t lime, and 200-400 g / t zinc sulfate; The lead-antimony flotation composite collector is composed of pentyl xanthate, 6-propyl-2-thio-2,3-dihydro-4(1H)pyrimidinone, sodium ethylenediaminetetramethylenephosphonate, sodium dimercaptosuccinate, and isobutylethoxycarbonyl thiourethane in a mass ratio of 5-10:1-2:2.3-3:1.4-1.8:0.4-0.

7. The zinc flotation reagents mentioned in step (2) include 2000-4000 g / t lime, 100-300 g / t copper sulfate, and 300-500 g / t YS-16; The desulfurization flotation reagents mentioned in step (3) include 60-100g / t sulfuric acid, 80-150g / t copper sulfate, 40-70g / t butyl xanthate, and 18-25g / t No. 2 oil.

2. The method for resource recovery of low-grade tin polymetallic ore tailings based on the synergistic effect of combined agents according to claim 1, characterized in that, The lead-antimony flotation reagents include 160 g / t sulfuric acid, 72 g / t sodium sulfite, 28 g / t lead-antimony flotation composite collector, 4200 g / t lime, and 310 g / t zinc sulfate.

3. The method for recycling low-grade tin polymetallic ore tailings based on the synergistic effect of combined reagents according to claim 1, wherein the zinc flotation reagents include 3080 g / t lime, 210 g / t copper sulfate, and 406 g / t YS-16.

4. The method for resource recovery of low-grade tin polymetallic ore tailings based on the synergistic effect of combined agents according to claim 1, characterized in that, The desulfurization flotation reagents include 75 g / t sulfuric acid, 120 g / t copper sulfate, 56 g / t butyl xanthate, and 23 g / t No. 2 oil.

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