Comprehensive utilization device for fine-fraction tailings and use method of comprehensive utilization device

Abstract

The invention relates to the technical field of tailing treatment, in particular to a fine-fraction tailing comprehensive utilization device and a use method thereof, and solves the problem that existing fine-fraction tailing iron powder is inevitably insufficient in strength when directly used in concrete, dry-mixed mortar or cement-based grouting materials to replace fly ash. The device comprises a sieving and collecting mechanism, a material injection and dust suppression mechanism is installed above the sieving and collecting mechanism, a synchronous grinding mechanism is installed between the sieving and collecting mechanism and the material injection and dust suppression mechanism, and the synchronous grinding mechanism comprises a connecting shell; and a material guide seat is fixedly mounted on the inner side of the connecting shell. The fine-fraction tailing iron powder is ground and sieved, so that the fine-fraction tailing iron powder is mixed into the concrete for modification operation, the fine-fraction tailing iron powder can replace fly ash as a mineral admixture to form a composite admixture with mineral powder to prepare the concrete, and the fine-fraction tailing iron powder is fully utilized.

Description

Technical Field

[0001] This invention relates to the field of tailings treatment technology, specifically to a device for the comprehensive utilization of fine-grained tailings and its usage method. Background Technology

[0002] Tailings have become the largest source and the largest stockpile of solid waste in my country. my country has 14.6 billion tons of tailings, 83% of which are from iron, copper, and gold mining. Metal mine tailings account for 34% of general industrial solid waste, posing a significant hazard and pollution source. The large amount of tailings piled up in tailings ponds cannot be effectively utilized, resulting in substantial resource waste.

[0003] Existing fine-grained tailings iron powder, when directly used in concrete, dry mortar, or cement-based grouting materials to replace fly ash, inevitably suffers from insufficient strength and is not easy to control the size of fine-grained tailings iron powder; therefore, it does not meet the current needs. To address this, we propose a comprehensive utilization device for fine-grained tailings and its usage method. Summary of the Invention

[0004] The purpose of this invention is to provide a device for the comprehensive utilization of fine-grained tailings and its usage method, in order to solve the problems mentioned in the background art, such as the insufficient strength that occurs when existing fine-grained tailings iron powder is directly used in concrete, dry mortar or cement-based grouting materials to replace fly ash, and the difficulty in controlling the size of fine-grained tailings iron powder.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fine-grained tailings comprehensive utilization device, comprising a screening and collection mechanism, an injection and dust suppression mechanism installed above the screening and collection mechanism, a synchronous grinding mechanism installed between the screening and collection mechanism and the injection and dust suppression mechanism, the synchronous grinding mechanism comprising a connecting shell, a guide seat fixedly installed on the inner side of the connecting shell, multiple guide grooves provided on the inner sides of the upper and lower ends of the guide seat, a central mounting seat fixedly installed on the inner side of the middle of the guide seat, a cooling pipe network fixedly installed on the inner side of the central mounting seat, auxiliary grinding seats fixedly installed on both the upper and lower end faces of the central mounting seat, a transmission sleeve rotatably connected to the middle of the central mounting seat, a transmission shaft fixedly installed on the inner side of the transmission sleeve, an upper grinding seat and a lower grinding seat fixedly installed on the upper and lower ends of the transmission sleeve respectively, a grinding disc fixedly installed on the adjacent side of the upper grinding seat and the lower grinding seat, and a conical seat fixedly installed on the upper end face of the upper grinding seat.

[0006] Preferably, the sieving and collecting mechanism includes a support base, a sieving shell is fixedly installed on the upper end face of the support base, a material guide holder is fixedly installed on the inner side of the upper end of the sieving shell, an inclined mounting ring is fixedly installed on the inner side of the middle part of the sieving shell, a screen is installed on the upper end face of the inclined mounting ring, and a vibration motor is fixedly installed on the upper end face of the screen.

[0007] Preferably, the dust suppression mechanism includes a conical injection shell, a guide ring is fixedly installed on the inner side of the bottom end of the conical injection shell, a coarse grinding ring is installed above the guide ring, a flow-dividing sleeve is installed above the coarse grinding ring, a plurality of spray nozzles are fixedly installed on the inner side of the flow-dividing sleeve, a motor mounting bracket is fixedly installed at the upper end of the conical injection shell, and a first drive motor is fixedly installed in the middle of the motor mounting bracket.

[0008] Preferably, a reflux mechanism is installed on one side of the screening and collecting mechanism. The reflux mechanism includes a reflux sleeve. A material conveying installation box is fixedly installed on one side of the reflux sleeve. Guide rollers are rotatably connected to the inner sides of both ends of the material conveying installation box. A coarse material outlet is fixedly installed at the bottom end of the reflux sleeve. A second drive motor is fixedly installed at the lower part of the front end face of the material conveying installation box.

[0009] Preferably, the sieve housing and the conical injection housing are fixedly connected by a connecting shell. The sieve housing, the connecting shell, and the conical injection housing are all coaxial with the drive shaft. The support base and the conical injection housing are connected through a return sleeve. The upper and lower ends of the return sleeve are fixedly connected to the support base and the conical injection housing. A conveyor belt is provided between the material conveying installation box and the two guide rollers. The conveyor belt rotates counterclockwise. The output of the second drive motor passes through the material conveying installation box and is connected to the conveyor belt through one of the guide rollers.

[0010] Preferably, the height of the end of the inclined mounting ring near the return sleeve is lower than the height of the end of the inclined mounting ring near the vibration motor, and an elastic sealing ring is provided between the side of the screen and the inclined mounting ring.

[0011] Preferably, the output end of the first drive motor passes through the motor mounting bracket and is connected to the upper end of the drive shaft via a coupling. The bottom end of the drive shaft passes through the conical seat, the upper grinding seat, the transmission sleeve, and the lower grinding seat in sequence and is rotatably connected to the middle part of the guide holder via a bearing. The drive shaft is fixedly connected to the upper grinding seat and the lower grinding seat via the transmission sleeve.

[0012] Preferably, the plurality of the guide grooves are arranged circumferentially relative to the axis of the guide seat, the guide seat is coaxial with the upper grinding seat and the lower grinding seat, the upper grinding seat and the lower grinding seat are symmetrically installed relative to the central mounting seat, and the rotation direction of the drive shaft is counterclockwise.

[0013] Preferably, the two grinding discs and the auxiliary grinding seat are symmetrically installed relative to the central mounting seat. A grinding gap is provided between the grinding disc and the auxiliary grinding seat. The surface of the auxiliary grinding seat is provided with multiple material dropping holes. The two grinding gaps are connected through the multiple material dropping holes. The surface of the grinding disc is provided with multiple circumferentially arranged arc strips. The arc strips on the surfaces of the two grinding discs are installed in opposite directions.

[0014] A method for using a fine-grained tailings comprehensive utilization device includes the following steps:

[0015] S1: Fine-grained iron tailings powder and concrete clinker are injected into the inner side of the conical injection shell in proportion. The power is turned on and the first drive motor is started. Under the support of the motor mounting frame, the first drive motor drives the upper grinding seat and the lower grinding seat to rotate counterclockwise through the drive shaft and the drive sleeve. When the upper grinding seat rotates relative to the coarse grinding ring, it can perform coarse grinding operation on the mixture and guide the material through the conical seat and the guide ring in sequence.

[0016] S2: A grinding gap is provided between the grinding disc and the auxiliary grinding seat, so that the guide seat can uniformly input the mixture into the grinding gap located above the central mounting seat through the guide groove. The two grinding gaps are connected through multiple drop holes. The surface of the grinding disc is provided with multiple arc strips arranged in a circle. The arc strips on the surfaces of the two grinding discs are installed in opposite directions, so that the mixture in the grinding gap can be ground in two stages when the grinding disc rotates relative to the auxiliary grinding seat.

[0017] S3: Simultaneously, the two grinding discs can sequentially gather and disperse the mixture through the arc strip, which facilitates the transport of the mixture through multiple drop holes within the two grinding gaps. After grinding, the mixture is guided to the upper surface of the screen by the guide seat and guide retainer. The vibration motor is started, which drives the screen to vibrate on the upper surface of the inclined mounting ring. The mixture can then be screened through the screen and the fine material is output through the bottom of the screen housing.

[0018] S4: Simultaneously start the second drive motor, which drives the conveyor belt inside the material feeding box to rotate counterclockwise through the guide roller. The conveyor belt then drives the coarse material to flow back through the return sleeve to the inside of the conical injection shell, thereby achieving continuous grinding of the mixture and improving grinding efficiency.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this invention, the first transmission motor drives the upper and lower grinding seats to rotate counterclockwise synchronously through the transmission shaft and transmission sleeve. When the upper grinding seat rotates relative to the coarse grinding ring, it can perform coarse grinding on the mixture. The guide seat can uniformly input the mixture into the grinding gap located above the central mounting seat through the guide groove. The two grinding gaps are connected by multiple drop holes. The arc strips on the surfaces of the two grinding discs are installed in opposite directions, so that when the grinding discs rotate relative to the auxiliary grinding seat, they can perform two-stage grinding on the mixture in the grinding gap. At the same time, the two grinding discs can sequentially gather and disperse the mixture through the arc strips, which facilitates the transport of the mixture in the two grinding gaps through multiple drop holes.

[0021] 2. This invention uses a vibrating motor to drive a screen to vibrate on the upper surface of an inclined mounting ring. This screen can then screen the mixture and output fine particles through the bottom of the sieve housing. The fine particles are then returned to the inner side of the conical injection shell through a return sleeve, achieving continuous grinding of the mixture and improving grinding efficiency. By grinding and sieving fine-grained tailings iron powder, it can be incorporated into concrete for modification. This invention can replace fly ash as a mineral admixture to form a composite admixture with mineral powder in the preparation of concrete, thus achieving full utilization of fine-grained tailings iron powder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention;

[0024] Figure 3 This is a cross-sectional schematic diagram of the dust suppression mechanism for material injection of the present invention;

[0025] Figure 4 This is an exploded structural diagram of the sieving and collecting mechanism of the present invention;

[0026] Figure 5 This is a schematic diagram of the synchronous grinding mechanism of the present invention;

[0027] Figure 6 This is a cross-sectional structural diagram of the synchronous grinding mechanism of the present invention;

[0028] Figure 7 This is an exploded view of the synchronous grinding mechanism of the present invention;

[0029] Figure 8 This is an exploded structural diagram of the material guide seat of the present invention;

[0030] Figure 9 This is a line graph comparing the compressive strength of the fine-grained iron tailings powder concrete at different ages according to the present invention.

[0031] Figure 10 This is a line graph comparing the compressive strength of fly ash concrete at different ages according to the present invention.

[0032] Figure 11 This is a line graph comparing the different compressive strengths of the dry powder mortar of the present invention.

[0033] Figure 12 This is a line graph comparing the different compressive strengths of the cement-based grouting material of the present invention;

[0034] Figure 13 This is a line graph comparing the different flexural strengths of the cement-based grouting material of the present invention.

[0035] In the diagram: 1. Screening and collecting mechanism; 101. Support base; 102. Screening shell; 103. Material guide holder; 104. Inclined mounting ring; 105. Screen; 106. Vibration motor; 2. Synchronous grinding mechanism; 201. Connecting shell; 202. Material guide seat; 203. Drive shaft; 204. Cooling pipe network; 205. Conical seat; 206. Upper grinding seat; 207. Lower grinding seat; 208. Grinding disc; 209. Central mounting seat; 2 10. Auxiliary grinding seat; 211. Guide trough; 212. Transmission sleeve; 3. Injection and dust suppression mechanism; 301. Conical injection shell; 302. Motor mounting bracket; 303. First transmission motor; 304. Diverting ring; 305. Spray nozzle; 306. Coarse grinding ring; 307. Guide ring; 4. Return mechanism; 401. Return sleeve; 402. Material conveying installation box; 403. Second transmission motor; 404. Coarse material outlet; 405. Guide roller. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] The vibration motor 106 (model JZO-50-4), the first drive motor 303 (model GV50-3.7KW-60-S), and the second drive motor 403 (model MDSKSRS080) mentioned in this invention can all be obtained from the market or through private customization.

[0038] Please see Figure 1 , Figure 2 and Figure 4An embodiment of the present invention provides a fine-grained tailings comprehensive utilization device, including a screening and collection mechanism 1. The screening and collection mechanism 1 includes a support base 101. A screening housing 102 is fixedly installed on the upper end face of the support base 101. A material guide and retaining frame 103 is fixedly installed on the inner side of the upper end of the screening housing 102. An inclined mounting ring 104 is fixedly installed on the inner side of the middle part of the screening housing 102. A screen 105 is installed on the upper end face of the inclined mounting ring 104. A vibration motor 106 is fixedly installed. The height of the end of the inclined mounting ring 104 near the return sleeve 401 is lower than the height of the end of the inclined mounting ring 104 near the vibration motor 106. An elastic sealing ring is provided between the side of the screen 105 and the inclined mounting ring 104, so that the vibration motor 106 drives the screen 105 to vibrate on the upper end face of the inclined mounting ring 104. Thus, the mixture can be screened through the screen 105 and the fine material can be output through the bottom end of the screen housing 102.

[0039] Please see Figures 1 to 8 A material injection dust suppression mechanism 3 is installed above the screening and collection mechanism 1. A synchronous grinding mechanism 2 is installed between the screening and collection mechanism 1 and the material injection dust suppression mechanism 3. The synchronous grinding mechanism 2 includes a connecting shell 201. A material guide seat 202 is fixedly installed on the inner side of the connecting shell 201. Multiple material guide grooves 211 are provided on the inner sides of both the upper and lower ends of the material guide seat 202. The multiple material guide grooves 211 are arranged in a circle relative to the axis of the material guide seat 202. A central mounting seat 209 is fixedly installed on the inner side of the middle part of the material guide seat 202. A cooling pipe network 204 is fixedly installed on the inner side of the central mounting seat 209. The cooling pipe network 204 can continuously cool the central mounting seat 209 and reduce instability during the grinding process.

[0040] Auxiliary grinding seats 210 are fixedly mounted on both the upper and lower ends of the central mounting base 209. A transmission sleeve 212 is rotatably connected to the middle of the central mounting base 209. An upper grinding seat 206 and a lower grinding seat 207 are fixedly mounted on the upper and lower ends of the transmission sleeve 212, respectively. The guide seat 202 is coaxial with the upper grinding seat 206 and the lower grinding seat 207. The upper grinding seat 206 and the lower grinding seat 207 are symmetrically mounted relative to the central mounting base 209. Grinding discs 208 are fixedly mounted on the adjacent sides of the upper grinding seat 206 and the lower grinding seat 207. The two grinding discs 208 and the auxiliary grinding seats... All 210 are symmetrically installed relative to the central mounting base 209. A grinding gap is provided between the grinding disc 208 and the auxiliary grinding base 210. The surface of the auxiliary grinding base 210 is provided with multiple material dropping holes. The two grinding gaps are connected through the multiple material dropping holes. The surface of the grinding disc 208 is provided with multiple arc strips arranged in a circle. The arc strips on the surfaces of the two grinding discs 208 are installed in opposite directions. The two grinding discs 208 can sequentially gather and disperse the mixture through the arc strips, which facilitates the transport of the mixture through the multiple material dropping holes in the two grinding gaps.

[0041] A drive shaft 203 is fixedly installed on the inner side of the drive sleeve 212. The drive shaft 203 rotates counterclockwise. The drive shaft 203 is fixedly connected to the upper grinding seat 206 and the lower grinding seat 207 through the drive sleeve 212. A conical seat 205 is fixedly installed on the upper end face of the upper grinding seat 206. The bottom end of the drive shaft 203 passes through the conical seat 205, the upper grinding seat 206, the drive sleeve 212, and the lower grinding seat 207 in sequence, and is rotatably connected to the middle part of the guide holder 103 through a bearing. The drive shaft 203 drives the upper grinding seat 206 and the lower grinding seat 207 to rotate synchronously through the drive sleeve 212, so as to realize two-stage grinding of the mixture in the grinding gap.

[0042] Please see Figures 1 to 3 The dust suppression mechanism 3 includes a conical injection shell 301. A sieve shell 102 is fixedly connected to the conical injection shell 301 via a connecting shell 201. The sieve shell 102, connecting shell 201, and conical injection shell 301 are all coaxial with the drive shaft 203. A guide ring 307 is fixedly installed on the inner side of the bottom end of the conical injection shell 301. A coarse grinding ring 306 is installed above the guide ring 307. A flow-dividing ring 304 is installed above the coarse grinding ring 306. A flow-dividing ring 304 is fixedly installed on the inner side of the flow-dividing ring 304. Multiple spray nozzles 305 are provided. A motor mounting bracket 302 is fixedly installed at the upper end of the conical injection shell 301. A first drive motor 303 is fixedly installed in the middle of the motor mounting bracket 302. The output end of the first drive motor 303 passes through the motor mounting bracket 302 and is connected to the upper end of the drive shaft 203 through a coupling. When the upper grinding seat 206 rotates relative to the coarse grinding ring 306, it can perform coarse grinding operation on the mixture and guide the material through the conical seat 205 and the guide ring 307 in sequence.

[0043] Please see Figure 1 A reflux mechanism 4 is installed on one side of the screening and collection mechanism 1. The reflux mechanism 4 includes a reflux sleeve 401. The support base 101 and the conical injection shell 301 are connected through the reflux sleeve 401. The upper and lower ends of the reflux sleeve 401 are fixedly connected to the support base 101 and the conical injection shell 301. A material conveying installation box 402 is fixedly installed on one side of the reflux sleeve 401. Guide rollers 405 are rotatably connected to the inner sides of both ends of the material conveying installation box 402. A coarse feed roller is fixedly installed at the bottom end of the reflux sleeve 401. The material outlet 404 and the lower part of the front end face of the material conveying installation box 402 are fixedly installed with a second drive motor 403. A conveyor belt is provided between the material conveying installation box 402 and the two guide rollers 405. The conveyor belt rotates counterclockwise. The output of the second drive motor 403 passes through the material conveying installation box 402 and is connected to the conveyor belt through one of the guide rollers 405. The conveyor belt drives the coarse material to flow back through the return sleeve 401 to the inner side of the conical injection shell 301, so as to realize the continuous grinding of the mixture and improve the grinding efficiency.

[0044] A method for using a fine-grained tailings comprehensive utilization device includes the following steps:

[0045] S1: Fine-grained iron tailings powder and concrete clinker are injected into the inner side of the conical injection shell 301 in proportion. The power is turned on and the first drive motor 303 is started. Under the support of the motor mounting frame 302, the first drive motor 303 drives the upper grinding seat 206 and the lower grinding seat 207 to rotate counterclockwise through the drive shaft 203 and the drive sleeve 212. When the upper grinding seat 206 rotates relative to the coarse grinding ring 306, it can perform coarse grinding operation on the mixture and guide the material through the conical seat 205 and the guide ring 307 in sequence.

[0046] S2: A grinding gap is provided between the grinding disc 208 and the auxiliary grinding seat 210, so that the guide seat 202 can uniformly input the mixture into the grinding gap located above the central mounting seat 209 through the guide groove 211, and the two grinding gaps are connected through multiple material drop holes. The surface of the grinding disc 208 is provided with multiple arc strips arranged in a circle. The arc strips provided on the surfaces of the two grinding discs 208 are installed in opposite directions, so that when the grinding disc 208 rotates relative to the auxiliary grinding seat 210, it can perform two-stage grinding on the mixture in the grinding gap.

[0047] S3: At the same time, the two grinding discs 208 can sequentially gather and disperse the mixture through the arc strip, which facilitates the transport of the mixture through multiple drop holes in the two grinding gaps. After grinding, the mixture is guided to the upper surface of the screen 105 by the guide seat 202 and the guide retainer 103. The vibration motor 106 is started, which drives the screen 105 to vibrate on the upper surface of the inclined mounting ring 104. The mixture can be screened through the screen 105 and the fine material is output through the bottom of the screen housing 102.

[0048] S4: Simultaneously start the second drive motor 403, so that the second drive motor 403 drives the conveyor belt provided inside the material conveying installation box 402 to rotate counterclockwise through the guide roller 405. Then the conveyor belt drives the coarse material to flow back through the return sleeve 401 to the inside of the conical injection shell 301, so as to realize the continuous grinding of the mixture and improve the grinding efficiency.

[0049] Please refer to Tables 1 and 2. Using a low-cement clinker system, the cement content accounts for only 50% of the total cementitious material system. The influence of fine-grained iron tailings powder content on concrete performance was tested by preparing C30 and C50 concretes by controlling the ratio of fine-grained iron tailings powder and slag powder. To more intuitively reflect the influence of fine-grained iron tailings powder content on the mechanical strength of concrete, concrete with an equal amount of fly ash replacing fine-grained iron tailings powder was selected as a control group.

[0050] Table 1 shows the mix proportions for C30 concrete made from fine-grained iron tailings powder (unit: kg / m³). 3 )

[0051] Group Water-to-glue ratio cement Fine-grained iron tailings powder fly ash Slag powder sand stone water A1 0.42 200 0 - 200 840 1018 168 A2 0.42 200 60 - 140 840 1018 168 A3 0.42 200 80 - 120 840 1018 168 A4 0.42 200 100 - 100 840 1018 168 A5 0.42 200 120 - 80 840 1018 168 A6 0.42 200 140 - 60 840 1018 168 F301 0.42 200 - 100 100 840 1018 168 F302 0.42 200 - 120 80 840 1018 168

[0052] Table 2 shows the mix proportions for C50 concrete made from fine-grained iron tailings powder (unit: kg / m3).

[0053] Group Water-to-glue ratio cement Fine-grained iron tailings powder fly ash Slag powder sand stone water C1 0.32 300 - - 200 740 970 160 C2 0.32 300 60 - 140 740 970 160 C3 0.32 300 80 - 120 740 970 160 C4 0.32 300 100 - 100 740 970 160 C5 0.32 300 120 - 80 740 970 160 C6 0.32 300 140 - 60 740 970 160 F501 0.32 300 - 100 100 740 970 160 F502 0.32 300 - 120 80 740 970 160

[0054] Please see Figure 9 and Figure 10 Under the same mix proportion, the 28-day cubic compressive strength of fine-grained iron tailings powder concrete gradually decreases with the increase of fine-grained iron tailings powder content. All groups of concrete can meet the requirement of 115% of the 28-day compressive strength of C30 and C50 concrete. The compressive strength of each group of concrete gradually increases with the age, and the cubic compressive strength of long-term concrete maintains a stable increase.

[0055] When comparing the performance of fly ash concrete, the content of fine-grained iron tailings powder accounts for less than 50% of the total mineral admixtures (total cementitious material is 400 kg / m³). 3 At that time, the amount of fine-grained iron tailings powder was 100 kg / m³. 3 When the content of fine-grained iron tailings powder concrete is within a certain range (e.g., 100-120 kg / m³), its performance is comparable to that of fly ash concrete. 3 The compressive strength of groups A4 and A5 within the specified range was slightly lower than that of the control groups F301 and F302 with the same amount of fly ash. However, the concrete in each group could still meet the requirement of 115% of the 34.5MPa compressive strength of C30 concrete. This indicates that, in terms of mechanical properties, modified fine-grained iron tailings powder at a dosage of 100-120kg / m³ is effective. 3 Within the specified range, it can replace fly ash as a mineral admixture and mineral powder to form a composite admixture for preparing C30 concrete;

[0056] When comparing the performance of fly ash concrete, the content of fine-grained iron tailings powder accounts for less than 60% of the total mineral admixtures, i.e., the total cementitious material content is 500 kg / m³. 3 At that time, the amount of fine-grained iron tailings powder was 120 kg / m³. 3 Within a certain range, the performance of modified fine-grained iron tailings powder concrete is comparable to that of fly ash concrete, with a dosage of 100-120 kg / m³. 3The compressive strength of groups C4 and C5 within the specified range was slightly lower than that of control groups F501 and F502 with the same fly ash content. However, the concrete in each group could still meet the requirement of 115% of the 57.5 MPa compressive strength of C50 concrete. This indicates that, in terms of mechanical properties, modified fine-grained iron tailings powder at a content of 100-120 kg / m³ is effective. 3 Within the specified range, it can replace fly ash as a mineral admixture and be used to form a composite admixture with mineral powder to prepare C50 concrete.

[0057] Please refer to Table 3. By changing the mass ratio of the three components, four types of dry powder mortar were prepared to realize the effect of iron tailings powder replacing manufactured sand and cement on the mechanical properties of dry powder mortar materials.

[0058] Table 3 shows the mix proportions for dry powder mortar (unit: kg / m³). 3 )

[0059] Group cement fly ash Fine-grained iron tailings powder Manufactured sand water Water reducing agent Cellulose ethers Sodium Gluconate G1 202 68 161 1448 226 1.3 0.13 0.03 G2 186 68 145 1481 209 1.3 0.13 0.03 G3 177 68 235 1401 261 1.3 0.13 0.03 G4 162 68 363 1288 304 1.3 0.13 0.03

[0060] Please see Figure 11 Group G1 meets the 28-day compressive strength requirements of M20, Group G2 meets the 28-day compressive strength requirements of M15, Group G3 meets the 28-day compressive strength requirements of M10, and Group G4 meets the 28-day compressive strength requirements of M5. Furthermore, the tensile bond strengths of the four groups are 0.30, 0.24, 0.28, and 0.21 MPa, respectively, all meeting the standard requirement of mortar tensile bond strength greater than 0.2 MPa. These results indicate that fine-grained iron tailings powder can be used to prepare dry-mix mortar. In one ton of dry-mix mortar, the iron tailings powder content in M20, M15, M10, and M5 is 85 kg, 88 kg, 115 kg, and 173 kg, respectively.

[0061] Please refer to Table 4 for the determination of six groups of cement-based grouting material proportions for high-performance cement-based grouting materials by replacing fly ash and cement with fine-grained iron tailings powder.

[0062] Table 4 shows the mix proportions of cement-based grouting materials (unit: kg).

[0063] Group cement fly ash Modified tailings Microbeads water Defoamer Plastic expander A1 900 80 0 20 320 0.03 0.15 A2 900 30 50 20 320 0.03 0.15 A3 855 30 95 20 320 0.03 0.15 A4 810 30 140 20 320 0.03 0.15 A5 765 30 185 20 320 0.03 0.15 A6 720 30 230 20 320 0.03 0.15

[0064] Please see Figure 12 and Figure 13 The compressive strength of the cement-based grouting materials prepared by each group still meets the specification requirements, and the 3d and 7d compressive strength of the A2-A4 groups can reach the 7d and 28d compressive strength requirements in the standard, respectively, while the 28d compressive strength of the A5 and A6 groups meets the standard requirements.

[0065] The flexural strength of the cement-based grouting materials prepared by each group still meets the specification requirements, and the 3-day flexural strength of each group can reach the 7-day flexural strength requirement in the specification. The 7-day strength of groups A2-A5 can reach the 28-day strength requirement in the specification, and the 28-day flexural strength of group A6 meets the standard requirements.

[0066] By comparing with the standard, the high-performance cement-based grouting material prepared by replacing fly ash and cement with iron tailings powder all meet the requirements in terms of fluidity, compressive strength and flexural strength. Taking into account the economic benefits and the utilization rate of iron tailings powder, the A6 group ratio was finally selected to prepare the cement-based grouting material.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for comprehensive utilization of fine-grained tailings, comprising a screening and collection mechanism (1), characterized in that: A material injection dust suppression mechanism (3) is installed above the sieving and collecting mechanism (1). A synchronous grinding mechanism (2) is installed between the sieving and collecting mechanism (1) and the material injection dust suppression mechanism (3). The synchronous grinding mechanism (2) includes a connecting shell (201). A material guide seat (202) is fixedly installed on the inner side of the connecting shell (201). Multiple material guide grooves (211) are provided on the inner sides of both the upper and lower ends of the material guide seat (202). A central mounting seat (209) is fixedly installed on the inner side of the middle part of the material guide seat (202). A cooling pipe network (209) is fixedly installed on the inner side of the central mounting seat (209). 4) The upper and lower end faces of the central mounting base (209) are fixedly mounted with auxiliary grinding seats (210). The central mounting base (209) is rotatably connected with a transmission sleeve (212). The inner side of the transmission sleeve (212) is fixedly mounted with a transmission shaft (203). The upper and lower ends of the transmission sleeve (212) are fixedly mounted with an upper grinding seat (206) and a lower grinding seat (207). The sides of the upper grinding seat (206) and the lower grinding seat (207) that are close to each other are fixedly mounted with a grinding disc (208). The upper end face of the upper grinding seat (206) is fixedly mounted with a conical seat (205).

2. The fine-grained tailings comprehensive utilization device according to claim 1, characterized in that: The sieving and collecting mechanism (1) includes a support base (101), a sieving shell (102) is fixedly installed on the upper end face of the support base (101), a material guide holder (103) is fixedly installed on the inner side of the upper end of the sieving shell (102), an inclined mounting ring (104) is fixedly installed on the inner side of the middle part of the sieving shell (102), a screen (105) is installed on the upper end face of the inclined mounting ring (104), and a vibration motor (106) is fixedly installed on the upper end face of the screen (105).

3. The fine-grained tailings comprehensive utilization device according to claim 2, characterized in that: The dust suppression mechanism (3) includes a conical injection shell (301), a guide ring (307) is fixedly installed on the inner side of the bottom end of the conical injection shell (301), a coarse grinding ring (306) is installed above the guide ring (307), a flow dividing ring (304) is installed above the coarse grinding ring (306), a plurality of spray nozzles (305) are fixedly installed on the inner side of the flow dividing ring (304), a motor mounting bracket (302) is fixedly installed at the upper end of the conical injection shell (301), and a first drive motor (303) is fixedly installed in the middle of the motor mounting bracket (302).

4. The fine-grained tailings comprehensive utilization device according to claim 3, characterized in that: A reflux mechanism (4) is installed on one side of the sieving and collecting mechanism (1). The reflux mechanism (4) includes a reflux sleeve (401). A material conveying installation box (402) is fixedly installed on one side of the reflux sleeve (401). Guide rollers (405) are rotatably connected to the inner sides of both ends of the material conveying installation box (402). A coarse material outlet (404) is fixedly installed at the bottom end of the reflux sleeve (401). A second drive motor (403) is fixedly installed at the lower part of the front end face of the material conveying installation box (402).

5. The fine-grained tailings comprehensive utilization device according to claim 4, characterized in that: The sieve housing (102) and the conical injection shell (301) are fixedly connected by a connecting shell (201). The sieve housing (102), the connecting shell (201) and the conical injection shell (301) are all coaxial with the drive shaft (203). The support base (101) and the conical injection shell (301) are connected through a return sleeve (401). The upper and lower ends of the return sleeve (401) are fixedly connected to the support base (101) and the conical injection shell (301). A conveyor belt is provided between the material conveying installation box (402) and the two guide rollers (405). The conveyor belt rotates counterclockwise. The output of the second drive motor (403) passes through the material conveying installation box (402) and is connected to the conveyor belt through one of the guide rollers (405).

6. The fine-grained tailings comprehensive utilization device according to claim 5, characterized in that: The height of the end of the inclined mounting ring (104) near the return sleeve (401) is lower than the height of the end of the inclined mounting ring (104) near the vibration motor (106). An elastic sealing ring is provided between the side of the screen (105) and the inclined mounting ring (104).

7. A fine-grained tailings comprehensive utilization device according to claim 6, characterized in that: The output end of the first drive motor (303) passes through the motor mounting bracket (302) and is connected to the upper end of the drive shaft (203) via a coupling. The bottom end of the drive shaft (203) passes through the conical seat (205), the upper grinding seat (206), the transmission sleeve (212), and the lower grinding seat (207) in sequence and is rotatably connected to the middle part of the guide holder (103) via a bearing. The drive shaft (203) is fixedly connected to the upper grinding seat (206) and the lower grinding seat (207) via the transmission sleeve (212).

8. A fine-grained tailings comprehensive utilization device according to claim 7, characterized in that: The multiple guide grooves (211) are arranged in a circle relative to the axis of the guide seat (202). The guide seat (202) is coaxial with the upper grinding seat (206) and the lower grinding seat (207). The upper grinding seat (206) and the lower grinding seat (207) are symmetrically installed relative to the central mounting seat (209). The rotation direction of the drive shaft (203) is counterclockwise.

9. A fine-grained tailings comprehensive utilization device according to claim 8, characterized in that: The two grinding discs (208) and the auxiliary grinding seat (210) are symmetrically installed relative to the central mounting seat (209). A grinding gap is provided between the grinding discs (208) and the auxiliary grinding seat (210). The surface of the auxiliary grinding seat (210) is provided with multiple material dropping holes. The two grinding gaps are connected through the multiple material dropping holes. The surface of the grinding discs (208) is provided with multiple arc strips arranged in a circle. The arc strips provided on the surfaces of the two grinding discs (208) are installed in opposite directions.

10. A method of using a fine-grained tailings comprehensive utilization device according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Fine-grained iron tailings powder and concrete clinker are injected into the inner side of the conical injection shell (301) in proportion. The power is turned on and the first drive motor (303) is started. Under the support of the motor mounting bracket (302), the first drive motor (303) drives the upper grinding seat (206) and the lower grinding seat (207) to rotate counterclockwise through the drive shaft (203) and the drive sleeve (212). When the upper grinding seat (206) rotates relative to the coarse grinding ring (306), it can perform coarse grinding operation on the mixture and guide the material through the conical seat (205) and the guide ring (307) in sequence. S2: A grinding gap is provided between the grinding disc (208) and the auxiliary grinding seat (210), so that the guide seat (202) can uniformly input the mixture into the grinding gap located above the central mounting seat (209) through the guide groove (211), and the two grinding gaps are connected through multiple drop holes. The surface of the grinding disc (208) is provided with multiple arc strips arranged in a circle. The arc strips provided on the surfaces of the two grinding discs (208) are installed in opposite directions, so that when the grinding disc (208) rotates relative to the auxiliary grinding seat (210), it can perform two-stage grinding on the mixture in the grinding gap. S3: At the same time, the two grinding discs (208) can sequentially gather and disperse the mixture through the arc strip, which facilitates the transport of the mixture through multiple drop holes in the two grinding gaps. After grinding, the mixture is guided to the upper surface of the screen (105) through the guide seat (202) and the guide retainer (103). The vibration motor (106) is started, which drives the screen (105) to vibrate on the upper surface of the inclined mounting ring (104). The mixture can be screened through the screen (105) and the fine material is output through the bottom of the screen housing (102). S4: Simultaneously start the second drive motor (403), so that the second drive motor (403) drives the conveyor belt provided inside the material conveying installation box (402) to rotate counterclockwise through the guide roller (405), and then the conveyor belt drives the coarse material to flow back to the inside of the conical injection shell (301) through the return sleeve (401), so as to realize the continuous grinding of the mixture and improve the grinding efficiency.

Images