A desulfurization method for copper tailings

Abstract

The invention discloses a desulfurization method for copper tailings, and relates to the technical field of copper tailings desulfurization. The desulfurization device for the copper tailings, the top of the crushing box is equipped with a first driving component, the output end of the first driving component penetrates the crushing box and is fixedly connected to a connecting rod and is used to make the connecting rod reciprocate up and down, the bottom of the connecting rod is connected to a crushing piece through a buffer assembly, and the bottom of the crushing piece is fixedly connected to a crushing block; the top of the crushing box is also equipped with a second driving component, the output shaft of the second driving component penetrates the crushing box and is connected to the buffer assembly, and the second driving component can make the buffer assembly drive the crushing piece to rotate relative to the connecting rod; the surface of the crushing piece is provided with a plurality of groups of stirring components in an annular array, and the stirring components can be used to stir and grind the copper tailings, which solves the problem that the common crushers or grinders have relatively single functions and are difficult to simultaneously meet the crushing and grinding of the copper tailings.

Description

Technical Field

[0001] The invention relates to the technical field of copper tailings desulfurization, in particular to a copper tailings desulfurization method. Background Art

[0002] Copper tailings are waste materials from copper mines, which usually contain a large amount of sulfides, such as pyrite and chalcopyrite. These sulfide minerals can produce a large amount of sulfuric acid and other pollutants during open-air storage or processing, which cause great harm to the environment. Therefore, it is very important to desulfurize copper tailings. There are many methods for desulfurization of copper tailings, among which the common methods include chemical method and biological method. The chemical method mainly converts sulfide minerals into sulfate or elemental sulfur through oxidation or reduction reaction, so as to achieve the purpose of desulfurization. This method includes leaching method, redox method, etc. The biological method uses microorganisms, such as sulfate-reducing bacteria, to remove sulfides by reducing sulfate to elemental sulfur. This method has the advantages of environmental protection, economy and sustainability.

[0003] In the prior art, there is also a flotation method for desulfurization. Before flotation desulfurization, the copper tailings need to be crushed and pre-treated, and then crushed and ground to make the particles smaller. However, common crushers or grinders have relatively single functions and it is difficult to meet the requirements of crushing and grinding of copper tailings at the same time. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a desulfurization device for copper tailings, which solves the problem that common crushers or grinders have relatively single functions and are difficult to simultaneously meet the requirements for crushing and grinding of copper tailings.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A desulfurization device for copper tailings, comprising a crushing box, a first driving component is installed on the top of the crushing box, an output end of the first driving component penetrates the crushing box and is fixedly connected to a connecting rod and is used to make the connecting rod reciprocate up and down, a crushing piece is connected to the bottom of the connecting rod through a buffer assembly, and a crushing block is fixedly connected to the bottom of the crushing piece;

[0008] A second driving component is also installed on the top of the crushing box, the output shaft of which passes through the crushing box and is connected to the buffer assembly, and the second driving component can make the buffer assembly drive the crushing piece to rotate relative to the connecting rod;

[0009] The surface of the crushing element is provided with a plurality of stirring components in a ring array, and the stirring components can be used for stirring and grinding the copper tailings.

[0010] Furthermore, the buffer assembly includes a buffer rod, a buffer spring and a connecting column, the buffer rod is fixedly connected to the connecting rod through a connecting bearing, the connecting column is fixedly connected to the buffer rod, one end of the buffer spring is fixedly connected to the bottom surface of the buffer rod, the other end of the buffer spring is fixedly connected to the top surface of the crushing piece, and the end of the connecting column away from the buffer rod movably penetrates the crushing piece.

[0011] Furthermore, the top of the buffer rod is fixedly connected to two parallel U-shaped frames, the end of the output shaft of the second driving component is fixedly connected to a square rod, both sides of the square rod are fixedly connected to limit blocks by screws, and the surfaces of the two limit blocks are movably connected to the inner walls of the two U-shaped frames respectively.

[0012] Further, the stirring assembly comprises two stirring plates, opposite sides of the two stirring plates both have arc-shaped surfaces, and the top and bottom of the stirring plates are both connected to the surface of the crushing member;

[0013] An electric push rod fixed on the crushing piece is arranged between two adjacent stirring assemblies, and a pull rod is symmetrically arranged at the end of the output shaft of the electric push rod through a short axis, and the pull rod is movably connected to the stirring plate.

[0014] Furthermore, the surface of the crushing member is provided with crushing rollers having the same number as the stirring assembly through a connecting component, the crushing rollers are arranged between two stirring plates of the same stirring assembly, and the opposite sides of the two stirring plates of the same stirring assembly are movably connected to the surface of the crushing rollers.

[0015] Furthermore, the connecting component includes a round rod, a connecting tube and a connecting spring, the round rod is movably connected to the crushing roller through a connecting shaft, one end of the connecting tube is fixedly connected to the surface of the crushing piece, the surface of the round rod is movably connected to the inner wall of the connecting tube, one end of the connecting spring is fixedly connected to the round rod, and the other end of the connecting spring is fixedly connected to the crushing piece.

[0016] Furthermore, an inner barrel is fixedly connected to the interior of the crushing box, a sliding groove is formed between the inner barrel and the crushing box, both ends of the connecting rod are fixedly connected to sliding rods, the surface of the sliding rod is movably connected to the inner side wall of the sliding groove, and a sieve plate that can move up and down is provided at the bottom of the sliding rod;

[0017] A plurality of anti-blocking rods are fixedly connected to the top of the sieve plate, and leakage holes having the same number as the anti-blocking rods are opened at the bottom of the inner barrel. The diameter of the anti-blocking rods is the same as the inner diameter of the leakage holes and corresponds to each other from top to bottom.

[0018] Furthermore, an electric telescopic rod is fixedly connected to the bottom of the sliding rod, and an output shaft of the electric telescopic rod is fixedly connected to the surface of the sieve plate.

[0019] Furthermore, the top surface of the crushing block is provided with a first curved surface, the bottom surface of the crushing block is provided with a second curved surface, and the bottom of the inner side wall of the inner barrel is adapted to the shape of the bottom surface of the crushing block.

[0020] A desulfurization method for copper tailings, the specific method is as follows: S1, pretreatment: crushing the copper tailings, sending the crushed copper tailings into a ball mill or a rod mill for crushing, screening the crushed copper tailings to separate coarse particles from fine particles;

[0021] S2. Adding adjusting agent: Mix the crushed copper tailings with water to form a slurry, add adjusting agent to the slurry, and monitor the pH value of the slurry by a pH meter or other pH testing equipment to ensure that it is within the range suitable for sulfide mineral flotation;

[0022] S3, flotation reagent addition: add collector to the ore pulp, then add foaming agent to the ore pulp, and finally add inhibitor to the ore pulp;

[0023] S4. Stirring: Under the premise of controlling the stirring speed and time, use stirring equipment to make the flotation reagent fully contact with the mineral;

[0024] S5. Air flotation separation: The stirred slurry is injected into the flotation tank or flotation column, and air is introduced through the blasting equipment to form bubbles. The target sulfur-containing minerals are adsorbed on the bubbles and float to the surface of the slurry to form a foam layer. The foam layer is collected by a scraper or an automatic foam discharge device of the flotation tank, and the collected foam layer is sent to the concentration and dehydration equipment to dry the dehydrated sulfur-rich concentrate. The desulfurized slurry at the bottom is discharged from the discharge port of the flotation tank;

[0025] S6, secondary flotation: collect the bottom desulfurized slurry, adjust the dosage and ratio of the adjusting agent and the flotation agent according to the characteristics of the bottom desulfurized slurry, repeat S2 to S5, perform secondary flotation treatment on the bottom desulfurized slurry, collect the sulfur-rich concentrate produced by the secondary flotation, combine it with the sulfur-rich concentrate produced by the primary flotation, and perform subsequent treatment on the desulfurized slurry after the secondary flotation.

[0026] Furthermore, the collector in S3 uses a combination of butyl xanthate and black medicine in a ratio of 3:1, and the dosage of the combined collector is selected to be 200 g / t of butyl xanthate and 66.7 g / t of black medicine.

[0027] Furthermore, the foaming agent in S3 is 2# oil, and the amount of 2# oil is 50g / t.

[0028] (III) Beneficial effects

[0029] The present invention has the following beneficial effects:

[0030] (1) The desulfurization device for copper tailings is provided with a connecting rod, a crushing member, a crushing block and a stirring assembly. Under the action of a first driving member and a second driving member, the connecting rod can drive the crushing member and the crushing block to rotate and hammer, thereby crushing the copper tailings. At the same time, the stirring assembly can stir when closed and grind when opened, thereby crushing and grinding the copper tailings. This solves the problem that the functions of common crushers or grinders are relatively single and it is difficult to simultaneously meet the requirements of crushing and grinding the copper tailings.

[0031] (2) The desulfurization device for copper tailings has a plurality of anti-blocking rods fixedly connected to the surface of the screen plate. When the screen plate moves, the anti-blocking rods will be driven to move synchronously, thereby clearing the leakage holes and poking out the copper tailings stuck in the leakage holes. When the screen plate moves upward to the highest point, the anti-blocking rods penetrate the leakage holes, thereby stirring the copper tailings accumulated at the bottom of the inner barrel to a certain extent, facilitating effective crushing.

[0032] (3) The desulfurization method of the copper tailings can not only effectively reduce the sulfur content in the copper tailings and improve resource utilization, but also has the advantages of simple process, convenient operation, and low equipment investment and operating costs.

[0033] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 2 This is a schematic diagram of the internal structure of the crushing box of the present invention;

[0036] Figure 3 For the present invention Figure 2 A magnified view of the structure at center;

[0037] Figure 4 This is a schematic diagram of the structure of the inner barrel of the present invention;

[0038] Figure 5 For the present invention Figure 4 A magnified view of the structure at B in the middle;

[0039] Figure 6 This is a structural schematic diagram of the electric push rod of the present invention;

[0040] Figure 7 It is a structural schematic diagram of the sieve plate of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the connection spring of the present invention;

[0042] Fig. 9This is a schematic diagram of the structure of the broken block of the present invention;

[0043] Fig.10 The figure is a flow chart of the method of the present invention.

[0044] In the figure, 1, crushing box; 2, connecting rod; 3, crushing piece; 4, crushing block; 5, buffer rod; 6, buffer spring; 7, connecting column; 8, U-shaped frame; 9, square rod; 10, limit block; 11, stirring plate; 12, electric push rod; 13, pull rod; 14, crushing roller; 15, round rod; 16, connecting pipe; 17, connecting spring; 18, inner barrel; 19, sliding groove; 20, sliding rod; 21, sieve plate; 22, anti-blocking rod; 23, leakage hole; 24, electric telescopic rod; 25, first arc surface; 26, second arc surface. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] See also Figure 1-10 The embodiment of the present invention provides a technical solution: a desulfurization device for copper tailings, comprising a crushing box 1, a first driving component is installed on the top of the crushing box 1, an output end of the first driving component penetrates the crushing box 1 and is fixedly connected to a connecting rod 2 and is used to make the connecting rod 2 reciprocate up and down, a crushing piece 3 is connected to the bottom of the connecting rod 2 through a buffer assembly, and a crushing block 4 is fixedly connected to the bottom of the crushing piece 3;

[0048] A second driving component is also installed on the top of the crushing box 1. The output shaft of the second driving component passes through the crushing box 1 and is connected to the buffer assembly. The second driving component can make the buffer assembly drive the crushing member 3 to rotate relative to the connecting rod 2.

[0049] The surface of the crushing element 3 is provided with a plurality of stirring components in a ring array, and the stirring components can be used for stirring and grinding the copper tailings.

[0050] Specifically, the buffer assembly includes a buffer rod 5, a buffer spring 6 and a connecting column 7. The buffer rod 5 is fixedly connected to the connecting rod 2 through a connecting bearing. The connecting column 7 is fixedly connected to the buffer rod 5. One end of the buffer spring 6 is fixedly connected to the bottom surface of the buffer rod 5. The other end of the buffer spring 6 is fixedly connected to the top surface of the crushing piece 3. The end of the connecting column 7 away from the buffer rod 5 moves through the crushing piece 3.

[0051] In this embodiment, when the crushing element 3 is subjected to a reaction force, the force is fed back to the buffer spring 6 , and the buffer spring 6 is compressed to offset the reaction force, thereby protecting the crushing element 3 and the crushing block 4 .

[0052] Specifically, the top of the buffer rod 5 is fixedly connected to two parallel U-shaped frames 8, the end of the output shaft of the second driving component is fixedly connected to a square rod 9, both sides of the square rod 9 are fixedly connected to limit blocks 10 by screws, and the surfaces of the two limit blocks 10 are movably connected to the inner walls of the two U-shaped frames 8 respectively.

[0053] In this embodiment, the limit block is fixed to the square rod 9 by screws, which is convenient for installation and disassembly, and is convenient for inspection and maintenance.

[0054] Specifically, the stirring assembly includes two stirring plates 11, and the opposite sides of the two stirring plates 11 have arc-shaped surfaces, and the top and bottom of the stirring plates 11 are connected to the surface of the crushing member 3;

[0055] An electric push rod 12 fixed on the crushing member 3 is arranged between two adjacent stirring assemblies, and a pull rod 13 is symmetrically arranged at the end of the output shaft of the electric push rod 12 through a short axis, and the pull rod 13 is movably connected to the stirring plate 11.

[0056] In this embodiment, during the crushing process and the grinding process, the stirring plate 11 can play a stirring role, so that the copper tailings inside the inner barrel 18 are in a flowing state, which is convenient for crushing and grinding.

[0057] Specifically, the surface of the crushing element 3 is provided with crushing rollers 14 having the same number as the stirring assembly through a connecting component, and the crushing rollers 14 are arranged between two stirring plates 11 of the same stirring assembly, and the opposite sides of the two stirring plates 11 of the same stirring assembly are movably connected to the surface of the crushing rollers 14.

[0058] The connecting parts include a round rod 15, a connecting tube 16 and a connecting spring 17. The round rod 15 is movably connected to the crushing roller 14 through a connecting shaft. One end of the connecting tube 16 is fixedly connected to the surface of the crushing piece 3. The surface of the round rod 15 is movably connected to the inner wall of the connecting tube 16. One end of the connecting spring 17 is fixedly connected to the round rod 15, and the other end of the connecting spring 17 is fixedly connected to the crushing piece 3.

[0059] In this embodiment, the electric push rod 12 is started to open the two stirring plates 11 in the stirring assembly of the same group, so that they are completely out of contact with the crushing roller 14, and then the second driving component is started. Under the action of the second driving component, the crushing element 3 rotates, and the rotation speed of the output shaft of the second driving component is gradually increased, so that the crushing roller 14 is subjected to a gradually increasing centrifugal force, and under the action of the centrifugal force, the crushing roller 14 gradually moves away from the crushing element 3, and the connecting spring 17 is stretched. The round rod 15 and the connecting pipe 16 play a guiding role for the crushing roller 14 and also provide supporting force. The crushing roller 14 moves to the inner wall of the inner barrel 18 and stops moving. At this time, the crushing roller 14 will squeeze and crush the small particles of copper tailings to turn them into powder. The stirring plate 11 can play a stirring and beating effect in this process, so that the small particles of copper tailings fly up in the inner barrel, which is convenient for the crushing roller 14 to crush and crush.

[0060] Specifically, an inner barrel 18 is fixedly connected to the inside of the crushing box 1, a sliding groove 19 is formed between the inner barrel 18 and the crushing box 1, and sliding rods 20 are fixedly connected to both ends of the connecting rod 2. The surface of the sliding rod 20 is movably connected to the inner side wall of the sliding groove 19, and a sieve plate 21 that can move up and down is provided at the bottom of the sliding rod 20;

[0061] A plurality of anti-blocking rods 22 are fixedly connected to the top of the sieve plate 21, and leakage holes 23 having the same number as the anti-blocking rods 22 are opened at the bottom of the inner barrel 18. The diameter of the anti-blocking rods 22 is the same as the inner diameter of the leakage holes 23 and corresponds to each other from top to bottom.

[0062] An electric telescopic rod 24 is fixedly connected to the bottom of the slide rod 20 , and an output shaft of the electric telescopic rod 24 is fixedly connected to the surface of the sieve plate 21 .

[0063] In this embodiment, when the screen plate 21 moves, the anti-blocking rod 22 will be driven to move synchronously, so that the leakage hole 23 can be cleared and the copper tailings stuck in the leakage hole 23 can be poked out, and when the screen plate 21 moves upward to the highest point, the anti-blocking rod 22 penetrates the leakage hole 23, so that the copper tailings accumulated at the bottom of the inner barrel 18 can be stirred to a certain extent, facilitating effective crushing.

[0064] Specifically, the top surface of the crushing block 4 is provided with a first curved surface 25 , the bottom surface of the crushing block 4 is provided with a second curved surface 26 , and the bottom of the inner wall of the inner barrel 18 is adapted to the shape of the bottom surface of the crushing block 4 .

[0065] In this embodiment, the top of the crushing block 4 has a first curved surface 25, and the copper tailings on it will automatically slide down under the action of the first curved surface 25, so as to reach the bottom of the crushing block 4. The bottom of the crushing block 4 has a second curved surface 26, which can generate an oblique force on the copper tailings when colliding with the copper tailings, thereby effectively crushing the copper tailings.

[0066] A desulfurization method for copper tailings, the specific method is as follows:

[0067] S1. Pretreatment: The copper tailings are crushed. Jaw crushers, cone crushers and other equipment can be used for preliminary crushing. The crushed copper tailings are sent to a ball mill or a rod mill for crushing to reach the target particle size. The crushed copper tailings are screened to separate the coarse particles from the fine particles. Screening equipment such as vibrating screens and drum screens can be used;

[0068] S2. Adding adjusting agent: Mix the crushed copper tailings with water to form a slurry. A stirring barrel or a stirring tank may be used for stirring. An adjusting agent such as sodium sulfate, sodium carbonate, etc. is added to the slurry to adjust the pH value of the slurry. The pH value of the slurry is monitored by a pH meter or other pH testing equipment to ensure that it is within a range suitable for the flotation of sulfide minerals.

[0069] S3, flotation reagent addition: add collectors such as xanthate and black powder to the pulp to enhance the adsorption of sulfur-containing minerals and bubbles, then add foaming agents such as methyl isobutyl carboxyamide (MIBC) to the pulp to stabilize the bubble structure and ensure the formation of the foam layer, and finally add inhibitors such as water glass and sodium cyanide to the pulp to reduce the flotation performance of non-target minerals;

[0070] S4. Stirring: Under the premise of controlling the stirring speed and time, use stirring equipment to make the flotation reagent fully contact with the mineral, such as stirring bucket, stirring tank or mixer to stir the slurry, to avoid excessive stirring that causes bubble bursting and affects the flotation effect;

[0071] S5, flotation separation: the stirred slurry is injected into the flotation tank or flotation column, and air is introduced through the blowing equipment, such as blower, air compressor and other equipment, to form bubbles. The target sulfur-containing minerals are adsorbed on the bubbles and float to the surface of the slurry to form a foam layer. The foam layer is collected by a scraper or an automatic foam discharge device of the flotation tank, and the collected foam layer is sent to a concentration and dehydration equipment, such as a filter press or a centrifugal dehydrator for dehydration. The dehydrated sulfur-rich concentrate is dried, which can be done by a dryer or natural drying. The desulfurized slurry at the bottom is discharged from the discharge port of the flotation tank;

[0072] S6, secondary flotation: collect the bottom desulfurized slurry, adjust the dosage and ratio of the adjusting agent and the flotation agent according to the characteristics of the bottom desulfurized slurry, repeat S2 to S5, perform secondary flotation treatment on the bottom desulfurized slurry, collect the sulfur-rich concentrate produced by the secondary flotation, combine it with the sulfur-rich concentrate produced by the primary flotation, and perform subsequent treatment on the desulfurized slurry after the secondary flotation.

[0073] The collector in S3 is a combination of butyl xanthate and black medicine, with a ratio of 3:1. The dosage of the combined collector is 200 g / t of butyl xanthate and 66.7 g / t of black medicine.

[0074] The foaming agent in S3 is 2# oil, and the dosage of 2# oil is 50g / t.

[0075] According to the data, the metal minerals in the tailings are mainly composed of a small amount of hematite, pyrite, chalcopyrite and sphalerite. Hematite is in anterior granular form, with fine particles and a particle size of about 0.01mm, and is distributed in a star-shaped pattern; pyrite is in semi-automorphic crystal form, with fine particles and a particle size of 0.02-0.14mm, replaced by chalcopyrite, and scattered distribution; chalcopyrite is in anterior crystalline form, with fine particles, replacing pyrite, and scattered distribution. The main gangue minerals are garnet, diopside, epidote, tremolite, actinolite, wollastonite, scapolite, fengshui stone, chlorite, serpentine, talc, sericite, quartz, calcite, dolomite, etc. Therefore, conventional industrial flotation agents are selected for tailings desulfurization.

[0076] The collectors used are butyl xanthate and black medicine, the activators used are SGS, SGS-4, Na2S, CuSO4, H2SO4, etc., the frother used is the most widely used 2# oil, the flotation feed is the tailings from the tailings pond, the flotation concentration is about 30%, the flotation time is 3 minutes, and the results are shown in the table below.

[0077]

[0078] The test results show that different combinations of reagents have a great influence on the separation index. Using a single combination of butyl xanthate and 2# oil, the sulfur content in the tailings is 0.48%. Adding black medicine to the collector can reduce the sulfur in the tailings to 0.34%. Adding activators such as SGS, SGS-4, Na2S, CuSO4, H2SO4, etc. can reduce the sulfur in the tailings to below 0.40%. Considering that the cost of reagents increases after adding activators, an additional dosing point needs to be added to the process, and the separation index does not change significantly, the combined collector of butyl xanthate and black medicine is selected in this test.

[0079] The tailings were tested for the ratio of butyl xanthate and black powder. The test process was a rough selection, the total amount of butyl xanthate and black powder was controlled at 533g / t tailings, 2# oil was 50g / t, the flotation concentration was about 30%, the flotation time was 3 minutes, and the test results of different collector ratios are shown in the table below.

[0080]

[0081] The test results show that when the ratio of butyl xanthate to black medicine increases from 2:1 to 5:1, the sulfur content in the tailings decreases from 0.40% to 0.25%, and the tailings yield increases from 78.63% to 80.94%. Considering that black medicine plays an auxiliary collection role, it is beneficial to reduce the sulfur content in the tailings. Therefore, the ratio of butyl xanthate to black medicine is selected as 3:1.

[0082] The tailings were tested for combined collector dosage (butyl xanthate and black medicine = 3:1). The test process was a rough selection, the combined collector dosage was variable (the dosage was calculated based on butyl xanthate), 2# oil 50g / t, flotation concentration of about 30%, flotation time 3 minutes, and the test results of different combined collector dosages are shown in the following table.

[0083]

[0084] The test results show that the change in the dosage of the combined collector has a great influence on the sulfur content in the tailings. As the dosage increases from 50g / t to 500g / t, the sulfur content in the tailings drops from 0.65% to 0.29%. Considering that the tailings are the main product this time, the owner requires the sulfur content in the tailings to be less than 0.40%. Therefore, the combined collector dosage is selected as 200g / t of butyl xanthate and 66.7g / t of black medicine.

[0085] The tailings were tested for the amount of frother (the frother was 2# oil). The test process was a roughing process, the combined collector amount was 200g / t of butyl xanthate and 66.7g / t of black powder, 2# oil was a variable, the flotation concentration was about 30%, the flotation time was 3 minutes, and the test results of different combined collector amounts are shown in the table below.

[0086]

[0087]

[0088] The test results show that the change in the amount of 2# oil has a great influence on the sulfur content in the tailings. When the amount of 2# oil increases from 25g / t to 100g / t, the sulfur content in the tailings decreases from 0.39% to 0.31%, and the yield decreases from 85.34% to 82.64%. Taking comprehensive considerations, the amount of 2# oil is selected as 50g / t.

[0089] In this embodiment, the method of desulfurizing copper tailings by the flotation method described above can not only effectively reduce the sulfur content in the copper tailings and improve resource utilization, but also has the advantages of simple process, convenient operation, low equipment investment and operating costs.

[0090] When in use, the copper tailings that need to be initially crushed are placed into the crushing box 1 from the feeding port at the top of the crushing box 1, and the copper tailings enter the inner barrel 18. Then, the first driving component is started. The first driving component can be a cylinder or a power device that can make the connecting rod 2 reciprocate up and down. During the up and down movement of the connecting rod 2, the crushing piece 3 will reciprocate up and down synchronously, driving the crushing block 4 to impact the copper tailings that need to be crushed, so that it gradually becomes smaller particles.

[0091] During the impact, the crushing piece 3 will be subjected to a counter-impact force. In order to increase the service life of the crushing piece 3 and the connecting rod 2, a buffer assembly is arranged between the crushing piece 3 and the connecting rod 2. The buffer assembly includes a buffer rod 5, a buffer spring 6 and a connecting column 7. The buffer rod 5 is connected to the connecting rod 2 through a connecting bearing. The connecting column 7 movably passes through the crushing piece 3, and the buffer spring 6 is arranged between the buffer rod 5 and the crushing piece 3. When the crushing piece 3 is subjected to a reaction force, the force is fed back to the buffer spring 6, and the buffer spring 6 is compressed to offset the reaction force, thereby protecting the crushing piece 3 and the crushing block 4.

[0092] The copper tailings with smaller particles after crushing will be at the bottom of the inner barrel 18. A leakage hole 23 is opened at the bottom of the inner barrel 18. When the crushing block 4 hits the copper tailings, some of the copper tailings will be squeezed into the leakage hole 23, which may cause the leakage hole 23 to be blocked, making subsequent unloading difficult. Therefore, it is necessary to dredge the leakage hole 23 during the crushing process to prevent blockage.

[0093] A sliding groove 19 is formed between the inner barrel 18 and the crushing box 1, and sliding rods 20 are fixedly connected to both ends of the connecting rod 2. The surface of the sliding rod 20 is movably connected to the inner side wall of the sliding groove 19. When the connecting rod 2 reciprocates up and down under the action of the first driving component, the sliding rod 20 will also reciprocate up and down with the connecting rod 2, thereby driving the sieve plate 21 fixed at the bottom of the sliding rod 20 to move up and down synchronously. Figure 7 As shown, a plurality of anti-blocking rods 22 are fixedly connected to the surface of the sieve plate 21. When the sieve plate 21 moves, the anti-blocking rods 22 will be driven to move synchronously, so that the leakage holes 23 can be cleared and the copper tailings plugged in the leakage holes 23 can be poked out. When the sieve plate 21 moves upward to the highest point, the anti-blocking rods 22 penetrate the leakage holes 23, so that the copper tailings accumulated at the bottom of the inner barrel 18 can be stirred to a certain extent, so as to facilitate effective crushing.

[0094] After crushing for a period of time, the electric telescopic rod 24 at the bottom of the slide bar 20 is started and extended, so that the screen plate 21 can move downward, thereby driving the anti-blocking rod 22 to separate from the leakage hole 23, so that the leakage hole 23 is opened, and the smaller particles of copper tailings after crushing will leak out from the leakage hole 23, then pass through the screen plate 21, and finally be discharged from the bottom outlet of the crushing box 1.

[0095] During the crushing process, in order to increase the fluidity of the copper tailings, the second driving component can be started. The second driving component can enable the motor or other driving devices to rotate the buffer rod 5 relative to the connecting rod 2. While the connecting rod 2 moves up and down, the second driving component rotates the square rod 9, so that the limit block 10 fixed thereon by screws rotates synchronously. Under the action of the limit block 10, the U-shaped rod drives the buffer rod 5 to rotate synchronously, and then the crushing member 3 can be rotated through the connecting column 7. Under the action of the crushing member 3, the stirring assembly installed thereon will also rotate synchronously and move up and down at the same time, so that the copper tailings can be stirred to increase its fluidity, and then smaller particles can be facilitated to reach the bottom of the inner barrel 18, which is conducive to crushing.

[0096] In addition, the stirring assembly includes two stirring plates 11, such as Figure 6 As shown, two adjacent stirring assemblies are provided with an electric push rod 12 fixed on the crushing piece 3, and the end of the output shaft of the electric push rod 12 is symmetrically provided with a pull rod 13 through a short axis, and the other end of the pull rod 13 is movably connected to the stirring plate 11. The two stirring plates 11 connected thereto can be moved by the extension and retraction of the electric push rod 12. Therefore, in the process that the stirring plate 11 rotates and moves up and down with the crushing piece 3, it can also move regularly under the action of the electric push rod 12, so that the two adjacent stirring plates 11 can be opened or closed, thereby further optimizing the stirring effect and enhancing fluidity.

[0097] The top of the crushing block 4 has a first curved surface 25, and the copper tailings on it will automatically slide down under the action of the first curved surface 25, so as to reach the bottom of the crushing block 4. The bottom of the crushing block 4 has a second curved surface 26, which can generate an oblique force on the copper tailings when impacting the copper tailings, thereby effectively crushing the copper tailings.

[0098] The above method can achieve effective crushing of copper tailings to produce smaller particles, which is conducive to subsequent processing and also convenient for the next step of grinding, further improving the desulfurization effect.

[0099] After the copper tailings with smaller particles are processed, they can be further ground by being placed back into the crushing box 1 to further reduce their particles, thereby further improving the desulfurization effect.

[0100] After placing the small-particle copper tailings into the crushing box 1, the first driving component is closed, the top surface of the anti-blocking rod 22 is flush with the inner wall surface of the inner barrel 18, and the position of the screen plate 21 is kept unchanged. Then the electric push rod 12 is started to open the two stirring plates 11 in the same stirring assembly, so that they are completely out of contact with the crushing roller 14, and then the second driving component is started. Under the action of the second driving component, the crushing element 3 rotates, gradually increasing the rotation speed of the output shaft of the second driving component, so that the crushing roller 14 is subjected to a gradually increasing centrifugal force. , and under the action of centrifugal force, the crushing roller 14 gradually moves away from the crushing part 3, the connecting spring 17 is stretched, the round rod 15 and the connecting pipe 16 play a guiding role for the crushing roller 14, and also provide supporting force. The crushing roller 14 moves to the inner wall of the inner barrel 18 and stops moving. At this time, the crushing roller 14 will squeeze and crush the small particles of copper tailings to turn them into powder. The stirring plate 11 can play a stirring and beating effect in this process, so that the small particles of copper tailings fly up in the inner barrel, which is convenient for the crushing roller 14 to crush and crush.

[0101] After the crushing is completed, the second driving component is closed to move the electric telescopic rod 24, so that the anti-blocking rod 22 can be separated from the leakage hole 23, which is beneficial to the powder unloading.

[0102] By providing the stirring plate 11, the crushing block 4, the crushing element 3 and the crushing roller 14, the problem that the common crushers or grinders have relatively single functions and cannot meet the requirements of crushing and grinding the copper tailings at the same time is solved.

[0103] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0104] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for desulfurization of copper tailings, characterized in that: The specific method is as follows: S1, pretreatment: placing the copper tailings to be initially crushed into the crushing box from the feed port at the top of the crushing box, crushing the copper tailings, and then placing the broken copper tailings particles back into the crushing box (1) or sending them to a ball mill or rod mill for crushing, and screening the crushed copper tailings to separate coarse particles from fine particles; S2. Adding adjusting agent: Mix the crushed copper tailings with water to form a slurry, add adjusting agent to the slurry, and monitor the pH value of the slurry by a pH meter or other pH testing equipment to ensure that it is within the range suitable for sulfide mineral flotation; S3, flotation reagent addition: add collector to the ore pulp, then add foaming agent to the ore pulp, and finally add inhibitor to the ore pulp; S4. Stirring: Under the premise of controlling the stirring speed and time, use stirring equipment to make the flotation reagent fully contact with the mineral; S5. Air flotation separation: The stirred slurry is injected into the flotation tank or flotation column, and air is introduced through the blasting equipment to form bubbles. The target sulfur-containing minerals are adsorbed on the bubbles and float to the surface of the slurry to form a foam layer. The foam layer is collected by a scraper or an automatic foam discharge device of the flotation tank, and the collected foam layer is sent to the concentration and dehydration equipment to dry the dehydrated sulfur-rich concentrate. The desulfurized slurry at the bottom is discharged from the discharge port of the flotation tank; S6, secondary flotation: collect the bottom desulfurized slurry, adjust the dosage and ratio of the adjusting agent and the flotation agent according to the characteristics of the bottom desulfurized slurry, repeat S2 to S5, perform secondary flotation treatment on the bottom desulfurized slurry, collect the sulfur-rich concentrate produced by the secondary flotation, combine it with the sulfur-rich concentrate produced by the primary flotation, and perform subsequent treatment on the desulfurized slurry after the secondary flotation; The collector in S3 is a combination of butyl xanthate and black medicine, with a ratio of 3:1, and the dosage of the combined collector is 200 g / t of butyl xanthate and 66.7 g / t of black medicine; The foaming agent in S3 is 2# oil, and the amount of 2# oil is 50g / t; A first driving component is installed on the top of the crushing box (1); an output end of the first driving component passes through the crushing box (1) and is fixedly connected to the connecting rod (2) and is used to make the connecting rod (2) reciprocate up and down; a crushing piece (3) is connected to the bottom of the connecting rod (2) via a buffer assembly; a crushing block (4) is fixedly connected to the bottom of the crushing piece (3); A second driving component is also installed on the top of the crushing box (1), the output shaft of the second driving component passes through the crushing box (1) and is connected to the buffer assembly, and the second driving component can enable the buffer assembly to drive the crushing element (3) to rotate relative to the connecting rod (2); The surface of the crushing element (3) is provided with a plurality of stirring components in a ring array, and the stirring components can be used to stir and grind the copper tailings; The buffer assembly comprises a buffer rod (5), a buffer spring (6) and a connecting column (7); the buffer rod (5) is connected to the connecting rod (2) via a connecting bearing; the buffer rod (5) rotates relative to the connecting rod (2); the connecting column (7) is fixedly connected to the bottom of the buffer rod (5); one end of the buffer spring (6) is fixedly connected to the bottom surface of the buffer rod (5); the other end of the buffer spring (6) is fixedly connected to the top surface of the crushing member (3); and one end of the connecting column (7) away from the buffer rod (5) movably penetrates the crushing member (3); The top of the buffer rod (5) is fixedly connected to two parallel U-shaped frames (8), the end of the output shaft of the second driving component is fixedly connected to a square rod (9), both sides of the square rod (9) are fixedly connected to limit blocks (10) by screws, and the surfaces of the two limit blocks (10) are movably connected to the inner side walls of the two U-shaped frames (8) respectively; The stirring assembly comprises two stirring plates (11), the opposite sides of the two stirring plates (11) both having arc-shaped surfaces, and the top and bottom of the stirring plates (11) are both connected to the surface of the crushing element (3); An electric push rod (12) fixed to the crushing member (3) is arranged between two adjacent stirring assemblies, and a pull rod (13) is symmetrically arranged at the end of the output shaft of the electric push rod (12) via a short axis, and the pull rod (13) is movably connected to the stirring plate (11); The surface of the crushing element (3) is provided with crushing rollers (14) having the same number as the stirring assembly via a connecting component; the crushing rollers (14) are arranged between two stirring plates (11) of the same stirring assembly, and the opposite sides of the two stirring plates (11) of the same stirring assembly are movably connected to the surface of the crushing rollers (14).

2. A desulfurization method for copper tailings according to claim 1, characterized in that: The connecting component comprises a round rod (15), a connecting tube (16) and a connecting spring (17); the round rod (15) is movably connected to the crushing roller (14) via a connecting shaft; one end of the connecting tube (16) is fixedly connected to the surface of the crushing member (3); the surface of the round rod (15) is movably connected to the inner side wall of the connecting tube (16); one end of the connecting spring (17) is fixedly connected to the round rod (15); and the other end of the connecting spring (17) is fixedly connected to the crushing member (3).

3. A desulfurization method for copper tailings according to claim 2, characterized in that: The crushing box (1) is fixedly connected to an inner barrel (18) inside, a sliding groove (19) is formed between the inner barrel (18) and the crushing box (1), both ends of the connecting rod (2) are fixedly connected to sliding rods (20), the surface of the sliding rod (20) is movably connected to the inner side wall of the sliding groove (19), and a sieve plate (21) that can move up and down is provided at the bottom of the sliding rod (20); A plurality of anti-blocking rods (22) are fixedly connected to the top of the sieve plate (21), and leakage holes (23) having the same number as the anti-blocking rods (22) are opened at the bottom of the inner barrel (18), and the diameter of the anti-blocking rods (22) is the same as the inner diameter of the leakage holes (23), and the anti-blocking rods (22) correspond to each other in a one-to-one manner; An electric telescopic rod (24) is fixedly connected to the bottom of the sliding rod (20), and an output shaft of the electric telescopic rod (24) is fixedly connected to the surface of the sieve plate (21).

4. A desulfurization method for copper tailings according to claim 3, characterized in that: The top surface of the crushing block (4) is provided with a first curved surface (25), the bottom surface of the crushing block (4) is provided with a second curved surface (26), and the bottom of the inner wall of the inner barrel (18) is adapted in shape to the bottom surface of the crushing block (4).

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