Device for removing suspended carbon particles in sand making of sandy slate and use method of device

Abstract

The invention relates to the technical field of sandy rock plate sand making treatment equipment, and particularly discloses a device for removing suspended carbon particles in sandy slate sand making and a using method thereof.The device comprises first removing equipment and second removing equipment, and the first removing equipment comprises a box body, a double-spiral sand washer, a mounting plate, a fan, a water injection component, a left scraping component and a right scraping component; the second removing equipment and the first removing equipment are the same in structure, the box body is obliquely arranged, the front end is higher than the rear end, and a sand outlet is formed in the front end; the double-screw sand washer is rotatably arranged in the box body, suspended particles in sand are washed out by using the double-screw sand washer, the suspended particles floating on the water surface are scraped by using the left scraping part and the right scraping part, and after primary washing is completed in the first removing equipment, the first removing equipment is used for removing the suspended particles; and the sand is driven by the double-screw sand washer to enter the second removal equipment to be cleaned again, so that suspended particles in the sand making and processing process of the sandy rock plate are effectively removed, and the sand making quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sandstone slate sand-making treatment equipment, and particularly relates to a device for removing suspended carbon particles from sandstone slate sand-making and a using method thereof. Background Art

[0002] Sandstone slate is a common sedimentary rock and is widely used in fields such as construction and road construction. With the increasing processing and utilization of sandstone slate, how to improve its quality and reduce impurities therein has become an important technical problem at present. In the process of sand-making of sandstone slate, the phenomenon of suspended carbon particles often occurs. These suspended carbon particles not only affect the quality of sand-making, but also have an adverse impact on the subsequent processing and application processes. Therefore, how to effectively remove the suspended carbon particles in sandstone slate has become a technical problem to be solved urgently.

[0003] Suspended carbon particles are formed by organic substances or incompletely combusted carbonized substances, have a small particle size, are dispersed in the mortar of sandstone slate, and have a certain buoyancy, and are easily carried into the sand-making process. In traditional sandstone slate treatment technologies, the removal of suspended carbon particles has always been a difficult problem. Current common methods include mechanical screening, gravity separation, and hydraulic separation, etc. However, these methods have significant limitations in the treatment process. First, the density difference between suspended carbon particles and sand grains is not large, and the particle size of the particles is small, resulting in ineffective separation through traditional gravity separation or hydraulic separation. Second, due to the strong buoyancy of suspended carbon particles, they often enter the sand-making products together with sand grains, affecting their final quality. In addition, when using chemical agents for treatment, it requires a high cost, and the chemical reaction will cause certain pollution to the environment.

[0004] Therefore, a device for removing suspended carbon particles from sandstone slate sand-making and a using method thereof are proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for removing suspended carbon particles from sandstone slate sand-making and a using method thereof, to solve the problem that it is difficult to remove suspended carbon particles during the processing of sandstone slate sand-making, which affects the subsequent sand-making quality and subsequent use.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a device for removing suspended carbon particles from sandstone slate sand-making, including a first removal device; The first removal device includes a box body, a double - helix sand washer, a mounting plate, a fan, a water - injection component, a left scraping component, and a right scraping component; the upper part of the box body is open and is inclined, the height of the front end of the box body is higher than that of the rear end, and a sand outlet is provided at the front end; the double - helix sand washer is rotatably arranged in the box body, with one end connected to the front end of the box body and the other end connected to the rear end of the box body; the mounting plate is transversely arranged at the upper part of the box body, with one end connected to the left end of the box body and the other end connected to the right end of the box body; the fan is arranged on the mounting plate, and the air outlet faces the rear end of the box body; the water - injection component is arranged at the rear end of the box body and continuously injects water towards the rear end of the box body; the left scraping component and the right scraping component have the same structure and are respectively arranged on the left and right sides of the rear end of the box body, and are used to scrape the suspended carbon particles floating at the rear end of the box body from the left and right sides of the box body to the outside of the box body.

[0007] As a further technical solution of the above - mentioned solution, it further includes a second removal device. The second removal device has the same structure as the first removal device, and the front end of the first removal device is arranged above the rear end of the second removal device. After the double - helix sand washer of the first removal device finishes washing the sand material, it transports the sand material to the front end of the first removal device, and the sand material falls into the second removal device below through the sand outlet at the front end of the first removal device for secondary washing.

[0008] As a further technical solution of the above - mentioned solution, a vertical floating - blocking plate is provided at the rear end of the box body, and the floating - blocking plate is arranged opposite to the air outlet of the fan; overflow grooves are further provided on the left and right sides of the rear end of the box body, and the overflow grooves divert the particles scraped by the left scraping component and the right scraping component to the external waste collection pool.

[0009] As a further technical solution of the above - mentioned solution, the left scraping component includes a motor, a mounting rod, and a scraping slurry plate; the motor is arranged on the left side of the rear end of the box body, the output shaft of the motor is connected to the mounting rod, and the mounting rod passes through the box body, and scraping slurry plates are provided on the side wall of the mounting rod.

[0010] As a further technical solution of the above - mentioned solution, a plurality of scraping slurry plates are provided and are arranged at equal intervals along the circumferential direction of the mounting rod.

[0011] As a further technical solution of the above - mentioned solution, a plurality of fans are provided and are arranged at equal intervals on the mounting plate.

[0012] As a further technical solution of the above - mentioned solution, it further includes a maintenance platform, and the maintenance platform is arranged on one side of the mounting plate.

[0013] A method for using a device for removing suspended carbon particles from sand - slate sand making includes the following steps Step S1: Feed the sand material that has been vibrated and screened after sand making into the box body of the first removal device. The box body is inclined, and the rear end of the box body remains full of water under the continuous water injection of the water injection component. Under the rubbing of the double - helix sand washer, the attachments on the surface of the coarse carbon particles and sand grains are stripped, and the large - particle carbon impurities are washed out by the spray water flow of the water injection component; Step S2: The sand material after initial rubbing enters the rear end of the box body. Coarse carbon particles are separated by means of gravity sedimentation. The water flow coverage area needs to reach more than 80% of the surface area of the sand - washing area in the box body to ensure that the suspended large - particle carbon impurities overflow with the water flow. The particle size of the coarse carbon particles > 0.5mm; As a further technical solution of the above - mentioned scheme, it includes a second removal device. The structure of the second removal device is the same as that of the first removal device, and the front end of the first removal device is arranged above the rear end of the second removal device. After the double - helix sand washer of the first removal device finishes cleaning the sand material, it transports the sand material to the front end of the first removal device, and the sand material falls into the second removal device below through the sand outlet at the front end of the first removal device for secondary cleaning; It also includes the following steps, Step S3: The sand material deposited at the bottom of the double - helix sand washer is pushed by the screw and flushed into the second removal device through the sand outlet by clean water. The second removal device re - rubs the sand material, generates a vortex through the rotation of the spiral blade, further destroys the adsorption layer of micron - sized carbon particles, and removes the remaining suspended carbon particles; Step S4: The processed sand material is pushed into a vibrating dewatering screen for dewatering. After dewatering is completed, it is sent to the finished sand bin through a belt conveyor for stacking and standby.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention uses a double - helix sand washer to wash out the suspended carbon particles in the sand material, continuously makes the suspended carbon particles float through the water injection component, and uses the left scraping component and the right scraping component to scrape the suspended carbon particles floating on the water surface to remove the suspended carbon particles in the sand material.

[0015] After the first removal device finishes the initial washing, the double - helix sand washer drives the sand material into the second removal device to wash the sand material again, further effectively removing the suspended carbon particles in the sand - slate sand - making process and ensuring the quality of sand making. Description of the Drawings

[0016] Figure 1 It is a usage state diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the first removal device.

[0018] Figure 3 It is a position schematic diagram of the first removal device and the second removal device.

[0019] Figure 4 It is a structural schematic diagram of the left scraping component, the right scraping component and the floating debris barrier.

[0020] Figure 5 It is a particle size distribution diagram.

[0021] The explanations of each label in the figure are as follows: the first removal device - 1; the box body - 11; the double - helix sand washer - 12; the mounting plate - 13; the fan - 14; the water injection component - 15; the left scraping component - 16; the motor - 161; the mounting rod - 162; the slurry scraping plate - 163; the right scraping component - 17; the second removal device - 2; the floating debris barrier - 3; the overflow tank - 4; the maintenance platform - 5. Specific implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention, so as to have a further understanding of the concept of the present invention, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought.

[0023] As Figures 1-4 shown, a device for removing suspended carbon particles from sand - slate sand making includes a first removal device 1; The first removal device 1 includes a box body 11, a double - helix sand washer 12, a mounting plate 13, a fan 14, a water injection component 15, a left scraping component 16 and a right scraping component 17; the upper part of the box body 11 is open and is inclined, and the height of the front end of the box body 11 is higher than that of the rear end; the double - helix sand washer 12 is rotatably arranged in the box body 11, with one end connected to the front end of the box body 11 and the other end connected to the rear end of the box body 11; the mounting plate 13 is horizontally arranged on the upper part of the box body 11, with one end connected to the left end of the box body 11 and the other end connected to the right end of the box body 11; the fan 14 is arranged on the mounting plate 13, and the air outlet faces the rear end of the box body 11; the water injection component 15 continuously injects water towards the rear end of the box body 11; the left scraping component 16 and the right scraping component 17 have the same structure and are respectively arranged on the left and right sides of the rear end of the box body 11, and are used for scraping the suspended carbon particles floating on the rear end of the box body 11 from the left and right sides of the box body 11 to the outside of the box body 11.

[0024] When using this device, the sand - slate has completed sand making to form sand materials with suspended carbon particles. After the sand materials are vibrated and screened, they are sent into the first removal device 1. The box body 11 is integrally inclined. After the sand materials enter the box body 11, they are rubbed by the double - helix sand washer; the box body 11 is continuously filled with water by the water injection component 15 to keep it full of water. The coarse carbon particles rubbed off from the sand materials are separated from the attachments on the surface of the sand grains, and the suspended carbon particles float on the water surface under the influence of buoyancy; under the continuous influence of the water injection component 15, the suspended carbon particles continuously float on the water surface, and the suspended carbon particles floating on the water surface are scraped by the left scraping component 16 and the right scraping component 17.

[0025] As Figure 3 shown, as a preferred embodiment, the structures of the second removal device 2 and the first removal device 1 are the same, and the front end of the first removal device 1 is arranged above the rear end of the second removal device 2. After the double - helix sand washer 12 of the first removal device 1 finishes cleaning the sand material, it transports the sand material to the front end of the first removal device 1, and the sand material falls into the second removal device 2 below through the sand outlet at the front end of the first removal device 1 for secondary cleaning. Due to the action of gravity, the sand material deposits at the lower part of the box body 11, is driven upward by the double - helix sand washer 12, and is flushed into the second removal device 2 by clean water through the sand outlet. At this time, the sand material has completed the primary washing in the first removal device 1, but there are still some impurities attached to the sand material. The second removal device 2, which has the same structure as the first removal device 1, further destroys the impurities in the sand material, separates the impurities from the adsorption in the sand material, forms suspended carbon particles, and also scrapes the suspended carbon particles to remove the remaining suspended carbon particles. In this stage, the sand grains are continuously stirred and pushed under the action of the spiral blades, thus forming a rotating eddy current. The eddy current can effectively destroy the adsorption layer of micron - sized carbon particles attached to the surface of the sand grains, so that the carbon particles break away from the surface of the sand grains and enter the water flow, reducing the carbon particle residue in the sand grains; after two screen - washing processes, the processed sand material undergoes subsequent vibration dehydration. After dehydration, it is conveyed to the finished sand bin for storage through a belt conveyor. In this device, the first removal device 1 performs primary washing, and the second removal device 2 performs secondary washing. Although they have the same structure, in the first removal device 1, the particles are mainly separated by rubbing, while in the second removal device 2, the adsorption layer of micron - sized carbon particles adsorbed on the surface of the sand grains is effectively destroyed by the eddy current, further removing the adsorbed particles in the sand grains and improving the cleaning effect.

[0026] As Figure 2 shown, as a preferred embodiment, a vertical drift - blocking plate 3 is provided at the rear end of the box body 11, and the drift - blocking plate 2 is arranged opposite to the air outlet of the blower 14; overflow troughs 4 are also provided on the left and right sides at the rear end of the box body 11, and the overflow troughs 4 divert the particles scraped by the left scraping component 16 and the right scraping component 17 to an external waste - material collection pool. In this embodiment, a drift - blocking plate 3 is provided at the rear end of the box body 11. The drift - blocking plate 3 is vertically arranged and opposite to the air outlet. The air blown by the blower 14 is blocked by the drift - blocking plate 3, and the air is dispersed towards the left and right sides of the box body 11, driving the suspended carbon particles floating on the water surface to be scraped out of the box body 11 from the left and right sides of the box body 11. At this time, the overflow troughs 4 catch the oily carbon substances, that is, the suspended carbon particles, scraped out by the left scraping component 16 and the right scraping component 17 on the left and right sides, and divert them to an external waste - oil collection pool for precipitation. Using the blower 14 to continuously blow air on the water surface can confine the suspended carbon particles in the sand - washing area, preventing them from moving upward with the sand material and the double - helix sand washer 11 and entering the second removal device 2 to contaminate the sand material.

[0027] As Figure 4 shown, as a preferred embodiment, the left scraping member 16 includes a motor 161, a mounting rod 162, and a slurry scraping plate 163; the motor 161 is disposed on the left side of the rear end of the box body 11, the output shaft of the motor 161 is connected to the mounting rod 162, the mounting rod 162 passes through the box body 11, and the slurry scraping plate 163 is provided on the side wall of the mounting rod 162. In this embodiment, when the motor 161 is started, the motor 161 rotates to drive the mounting rod 162 to rotate. When the mounting rod 162 rotates, it drives the slurry scraping plate 163 to rotate. When the slurry scraping plate 163 rotates, it scrapes the water surface, and the suspended carbon particles floating on the water surface are driven by the slurry scraping plate 163 to leave the box body 11, realizing the removal of the suspended carbon particles.

[0028] As Figure 4 shown, as a preferred embodiment, a plurality of the slurry scraping plates 163 are provided and are equidistantly arranged along the circumferential direction of the mounting rod 162. In this embodiment, by providing a plurality of the slurry scraping plates 163, during the rotation of the mounting rod 162, after the slurry scraping plate 163 rotates to scrape the suspended carbon particles and leaves the water surface, another slurry scraping plate 163 takes over to contact the water surface to scrape the suspended carbon particles, improving the construction efficiency.

[0029] As Figure 2 shown, as a preferred embodiment, a plurality of the blowers 14 are provided and are equidistantly arranged on the mounting plate 13. In this embodiment, by providing a plurality of the blowers 14, the plurality of blowers 14 continuously blow the water surface simultaneously, expanding the blowing area, and also ensuring that the suspended carbon particles are continuously blown to both sides of the box body 11 and are easily scraped off by the left scraping member 16 and the right scraping member 17.

[0030] As Figure 2 shown, as a preferred embodiment, it further includes a maintenance platform 5, and the maintenance platform 5 is disposed on one side of the mounting plate 13. In this embodiment, the maintenance platform 5 is provided on the side of the mounting plate 13, and when the device fails, construction workers can board the maintenance platform 5 for maintenance.

[0031] A method for using a device for removing suspended carbon particles from sandstone sand making includes the following steps, Step S1, feeding the sand material after vibration screening after sand making into the box body 11 of the first removal device 1. The box body 11 is inclined, and the rear end of the box body 11 remains in a full water state under the continuous water injection of the water injection member 15. Under the rubbing of the double - spiral sand washer 12, the attachments on the surfaces of the coarse carbon particles and the sand grains are peeled off, and the large - particle carbon impurities are washed out by the spray water flow of the water injection member; Step S2: The sand material after primary rubbing enters the rear end of the box body 11. Coarse carbon particles are separated by means of gravity sedimentation. The water flow coverage area should reach more than 80% of the surface area of the sand washing area in the box body 11 to ensure that the suspended large particle carbon impurities overflow with the water flow. The particle size of the coarse carbon particles > 0.5 mm. Step S3: The sand material deposited at the bottom of the double - spiral sand washer 12 is pushed by the spiral and flushed into the second removal device 2 with clean water through the sand outlet. The second removal device 2 re - rubs the sand material, generates a vortex through the rotation of the spiral blades, further destroys the adsorption layer of micron - sized carbon particles, and removes the remaining suspended carbon particles. Step S4: The processed sand material is pushed into a vibrating de - watering screen for de - watering. After de - watering, it is sent to the finished sand bin through a belt conveyor for storage and standby.

[0032] The box body 11, as the main structure of the whole set of equipment, undertakes the functions of supporting and accommodating each device component, can withstand the vibration and load of each device, and maintains stable performance under long - term high - intensity operation. The box body 11 is prepared from steel or high - strength alloy materials, with high corrosion resistance and compressive resistance. The box body 11 can be set as a modular component, which is convenient for disassembly and then on - site installation. Support feet or pulleys are configured at the bottom of the box body 11 to ensure stable operation in different environments.

[0033] The maintenance platform 5, as the operating platform during equipment operation, provides a safe and convenient working space for construction workers. When the equipment fails or needs maintenance, construction workers can quickly reach each key component of the equipment through the maintenance platform for maintenance. The maintenance platform 5 is equipped with a right - hand guardrail and a ladder to ensure the safety of construction workers. The surface of the platform is provided with an anti - slip setting to ensure construction safety.

[0034] The double - spiral sand washer 3, which is installed in the machine body 1 and has a spiral rotation function, is used for washing the sandy slate material to remove the suspended carbon particles therein. Specifically, the double - spiral sand washer 12 is one of the core components of the equipment, installed inside the box body 11, and adopts two symmetrically arranged spiral blades, with a spiral rotation function. Its main task is to wash the sandy slate material to remove the suspended carbon particles therein. The spiral blades rotate to stir the sand material, so that the suspended carbon particles in the material are dispersed and float under the action of water flow. Through the pushing action of the spiral, the sandy slate material is continuously lifted and washed inside the sand washer, so as to achieve the effect of removing impurities. The double - spiral design makes the stirring process more uniform, enhances the washing effect, and makes the separation of suspended carbon particles more thorough.

[0035] The fan 14 is installed on the mounting plate 13 and continuously blows air on the water surface of the box body 11. The fan 14 is linked with the drive motor of the double - helix sand washer 12, and automatically adjusts the sharpness according to the change of the screw rotation speed to ensure the stability of the air flow and the sufficiency of the air current. In some preferred embodiments, a flow - guiding cover can be arranged at the upper part of the box body 11 to direct the flow direction of the air current, with an included angle of 15 - 45° with the horizontal plane, ensuring that the air current can be effectively guided to the aggregation area of the suspended carbon particles and preventing the suspended carbon particles from entering the next process along with the spiral agitation.

[0036] When the whole device is in use: S1. First, the raw materials are preliminarily screened by the vibrating screening workshop, and the sandy slate in the mixture is separated from other impurities. Then, the mixture is sent into the bottom - layer water - collecting hopper through a bottom conveyor device. The function of the water - collecting hopper is to collect the mixture and evenly transport it to the sand washer. An appropriate water flow system is designed in the water - collecting hopper to ensure that the sediment will not block the feeding channel, and at the same time, the water flow can effectively carry away some of the lighter suspended substances. The design of the water - collecting hopper takes into account the fluidity of water, avoids the accumulation of solid materials, and ensures that the raw materials can smoothly enter the first - stage double - helix sand washer.

[0037] S2. In the first - stage double - helix sand washer, under the mechanical rubbing action of the spiral blades, after the initial rubbing stage, the coarse carbon particles and the attached substances on the surface of the sand grains are peeled off, and the large - particle carbon impurities are preliminarily washed out by the spray water flow. The rotation speed of the spiral sand washer is 10 - 15 r / min, the blade inclination angle is 15 - 45°, and the spray water pressure is 0.2 - 0.5 MPa; Specifically, after entering the first - stage double - helix sand washer, the mixture is initially separated under the rubbing action of the spiral blades. During this process, the sand washer separates the sandy materials in the mixture from the lighter impurity particles (such as suspended carbon particles) through the power of spiral rotation. Due to the smaller density, the suspended carbon particles will float on the water surface of the sand - washing pool. To further separate these floating carbon particles, an automatic scraping plate is installed on the sand washer. The scraping plate will quickly sweep across the pool surface according to the set height and position, automatically scraping the suspended carbon particles out of the sand - washing pool surface to prevent these particles from continuing to mix with the sand materials. The design of the scraping plate enables the suspended carbon particles to be removed quickly and efficiently.

[0038] S3. The sand materials after the initial rubbing enter the first - stage sedimentation tank, and the coarse carbon particles are separated by gravity sedimentation, and the sewage containing fine particles is discharged through the overflow port. The water flow coverage area needs to reach more than 80% of the surface area of the sand - washing pool to ensure that the suspended carbon particles overflow with the water flow, and the particle size of the coarse carbon particles > 0.5 mm.

[0039] S4. The suspended carbon particles flow into the temporary storage pool through the overflow trough and are transported to the waste oil centralized collection periodically; Among them, the overflow tank has an adjustable structure and can automatically adjust the liquid level in the tank according to the water flow rate and the concentration of suspended carbon particles. The temporary storage tank is a tank body that can hold a certain amount of oily carbon substances, and it is cleaned and transported regularly.

[0040] S5. The sand deposited at the bottom of the sand washer is pushed by the screw and flushed into the secondary double-screw sand washer through the sand outlet by clean water for the re-scrubbing stage. By the rotation of the screw blades, eddy currents are generated, further destroying the adsorption layer of micron-sized carbon particles and removing the remaining suspended carbon particles. In the secondary double-screw sand washer, through the re-washing stage combined with high-pressure reverse flushing water, the residual carbon particles are completely removed. The sewage enters the tail water treatment system, and the suspended substances are recovered and the water is recycled through flocculation and precipitation, where the water pressure is 1-2 MPa.

[0041] Specifically, the sand deposited at the bottom of the sand washer is pushed by the rotation of the screw blades and flushed into the secondary double-screw sand washer through the sand outlet by clean water, entering the re-scrubbing stage. In this stage, the sand grains are continuously stirred and pushed under the action of the screw blades, thus forming a rotating eddy current. The action of the eddy current can effectively destroy the adsorption layer of micron-sized carbon particles attached to the surface of the sand grains, causing the carbon particles to detach from the surface of the sand grains and enter the water flow, reducing the carbon particle residue in the sand grains. This process enhances the effect of removing carbon particles through mechanical stirring and the scouring of the water flow.

[0042] In the secondary double-screw sand washer, the cleaning process is further enhanced by combining high-pressure reverse flushing water. The role of the high-pressure reverse flushing water is to spray high-pressure water flow with a water pressure of 1-2 MPa through the nozzle to precisely flush the sand grains in the sand washer, ensuring that the residual carbon particles attached to the surface of the sand grains are completely removed. The high-pressure water flow has a strong cleaning force and can penetrate into the gaps between the sand grains, ensuring the high efficiency of the re-washing stage.

[0043] The sewage after re-washing enters the tail water treatment system. The tail water treatment system adopts the flocculation and precipitation technology to further remove the suspended substances in the water. By adding flocculants, the carbon particles and other suspended substances in the water form larger particles, which are convenient for precipitation and removal. The treated sewage can be further purified and recycled to realize the recycling of water resources, reduce the water consumption in the production process and reduce the impact on the environment.

[0044] Through multi-stage washing, re-washing and tail water treatment, the present invention not only improves the cleanliness of the sand grains and the product quality, but also effectively realizes the recovery and reuse of sewage. It is an efficient sand washing system integrating environmental protection and energy conservation, which can significantly reduce the production cost and at the same time reduce environmental pollution.

[0045] S6. The finally treated sand is pushed into a vibrating dewatering screen for dewatering. After being mixed with the recovered fine sand and the dewatering is completed, it is sent to the finished sand bin for storage and standby through a belt conveyor.

[0046] Specifically, after being processed by the secondary sand washer, the clean sand material will be sent to a vibrating dewatering screen for final dewatering. The dewatering screen effectively removes the excess water from the sand material by means of high-frequency vibration. The fine structure of the screen mesh can ensure the rapid separation of sand grains and the discharge of water, enabling the finished sand to reach a relatively low moisture content. The sand material after dewatering will be mixed with the fine sand recovered by other equipment and sent to the finished sand bin for storage through a belt conveyor. At this stage, the quality of the finished sand is finally guaranteed, and the moisture content is already within the optimal range, and it can be directly put into subsequent projects or production for use. This sand making method not only effectively removes carbon particles and fine powder in the sand material, but also ensures the high cleanliness of the sand material, which is suitable for various high-quality building and industrial applications.

[0047] In step S6, the fine sand recovery is divided into two parts according to the process calculation: one part is recovered from the sand outlet of the secondary double spiral sand washer and mixed with the coarse sand pushed by the spiral, and the other part is recovered by the sewage treatment workshop. The recovered fine sand is proportioned according to the content of stone powder in the finished sand. The excess unused fine sand enters the mud cake storage area together with the pressed mud cake and is regularly transported to the slag yard for stacking by a loader. Among them, the belt conveyor is used to send the dewatered sand into the finished sand bin.

[0048] Among them, the particles mentioned in the above process include: The particles include: Spherical particles: Due to their symmetry, they have less resistance during sedimentation and a faster sedimentation speed.

[0049] Flaky particles: Irregular in shape, they will be disturbed by water flow during sedimentation, resulting in a slower sedimentation speed.

[0050] Fibrous particles: Similar to flaky particles, they have a large surface area, increasing their interaction with other particles or flocculants in water Mineral composition: Quartz: 0.005mm - 0.02mm, colorless in thin section, angular, silt-like, with low positive relief.

[0051] Feldspar: 0.02mm, colorless in thin section, sub-angular, short columnar, mostly sericitized, but retaining the feldspar pseudomorph, distributed between quartz grains, accounting for 15%; Carbonaceous matter: 0.005mm, black in thin section, flocculent, earthy distribution or cementing quartz and feldspar, accounting for 15%; Muscovite: Colorless in thin section, with bright interference colors, distributed in small strip-like flakes, in small amounts; Cement: Ferruginous (mainly limonite), accounting for 10%; argillaceous (mainly hydromica), accounting for 20%; showing pore-type cementation.

[0052] Among them, the characteristics of sandy slate are as follows: The sandy slate is mainly composed of sand grains and clay minerals. The sand grains are mainly minerals such as quartz, feldspar, and mica, and these minerals have strong chemical stability.

[0053] 1. Bedding structure The sandy slate exhibits a bedding or flaky structure, and its formation is related to the sedimentary environment. The bedding planes are parallel and easy to peel off, giving it good layering properties in the natural state.

[0054] The existence of bedding makes the sandy slate easy to break along the bedding direction during the artificial sand production process, generating relatively regular fragments.

[0055] 2. Mechanical properties The sandy slate has a relatively high compressive strength, but due to its bedding structure, its shear strength is relatively low and it is easy to rupture along the bedding direction. The hardness of the material is medium, between 6 - 7 (Mohs hardness), and this characteristic makes it relatively easy to break during the artificial sand production process.

[0056] 3. Particle characteristics The particles of the sandy slate are mainly composed of quartz particles. Quartz is widely present in nature and has a high hardness, so its particles are relatively hard and wear-resistant. Nevertheless, the clay component in it is relatively fine, resulting in the generation of some fine particles.

[0057] During the artificial sand production process, due to the relatively high clay content, there are often some suspended substances in the mortar (such as suspended carbon particles, mineral particles, etc.).

[0058] 4. Water content and organic matter content The sandy slate adsorbs or contains a certain amount of water and organic matter during the weathering process. In particular, clay minerals and other chemical components will react with the organic matter in water to form suspended carbon particles, affecting the clarity of the sand-making water. The organic matter and carbon particles in it come from plant residues during the sedimentation process or organic impurities in minerals.

[0059] The particle extraction includes the following steps: 1. Sampling and sample confirmation The sampling is designated on-site by the geological engineer of the Chengdu Institute's resident representative office organized by the administrative bureau. After the geological engineer confirms that the tunnel excavation material is basically sandy slate and there is no weathering. The test and detection center samples the tunnel excavation material according to relevant requirements.

[0060] Among them, for the manufactured sand of the 3 groups (LHK-1, LHK-2, LHK-3) processed from the excavation materials of the exploration adit, the test results of the particle size distribution all meet the range of Zone 2 of manufactured sand, and the fineness moduli are 2.72, 2.74, and 2.64 respectively, all meeting the range requirements of 2.4 - 2.8 in the "Code for Construction of Hydraulic Concrete". The specific test results are shown in Table 1, and the particle size distribution diagram is shown in Figure 5 .

[0061] Table 1 2. Detection by the rapid mortar bar method The rapid mortar bar method is carried out in accordance with the "Test Code for Aggregates of Hydraulic Concrete". This method can detect the potential harmful alkali-silica reaction of aggregates in mortar within 16 days, and is especially suitable for testing aggregates with slow reaction or only swelling in the later stage. In this test, Portland cement with an alkali content of 0.77% is used, and the alkali content of the cement is adjusted to 0.9% with 10% NaOH solution during the test. Evaluation criteria: ① If the expansion rate of the specimen at 14 days is less than 0.1%, the aggregate is a non-reactive aggregate. ② If the expansion rate of the specimen at 14 days is greater than 0.2%, the aggregate is a reactive aggregate with potential harmful reaction. ③ If the expansion rate of the specimen at 14 days is 0.1% - 0.2%, the aggregate should be comprehensively evaluated in combination with the on-site use history, petrographic analysis, test results after extending the observation time of the specimen to 28 days, or the test results of the concrete prism method. The test results of the rapid mortar bar method are listed in Table 2.

[0062] Table 2 1. By using the principle of "washing clothes", the present invention adopts a spiral sand washer to scrub the suspended carbon particles twice, effectively solving the problem that it is difficult to remove the suspended carbon particles in the traditional sand-making process. By first using turbid water for scrubbing and then using clean water for scrubbing again, the fine powder particles are fully suspended and float on the surface of the sand washer pool to form oily carbon substances, thus realizing the efficient separation of the suspended carbon particles. The oily carbon substances are automatically scraped out by the automatic slurry scraping board and flow into the temporary storage pool through the overflow tank, which not only improves the cleaning effect, but also reduces the wear of the equipment and reduces the need for manual intervention. At the same time, the centralized collection and regular treatment mechanism of waste oil ensures the environmentally friendly treatment of waste and avoids environmental pollution. This method greatly improves the cleanliness and production efficiency of the sand material, and can effectively control pollutants and recycle resources, with significant economic and environmental benefits.

[0063] 2. The equipment developed in the present invention fully takes into account the safety of operators and the convenience of equipment maintenance. By setting up a maintenance platform, operators can quickly arrive at the site for maintenance when the equipment fails, thereby reducing the production downtime caused by equipment failures. This design improves the overall maintainability of the equipment and ensures the stability and continuity of the production process. In addition, the design of the air resistance device and the overflow tank also enables operators to adjust the air flow and liquid level in a timely manner during the sand washing process, further ensuring the effective removal of suspended carbon particles.

[0064] 3. The temporary storage pool and the overflow tank adopted in the present invention have adjustable structures, which can automatically adjust the liquid level in the tank according to the water flow rate and the concentration of suspended carbon particles, effectively avoiding the secondary pollution of carbon particles in the wastewater. In addition, the reasonable layout of the fine sand recovery system ensures the maximum recovery and resource utilization of fine sand, reducing the waste of resources in the production process. The unused excess fine sand enters the mud cake storage area together with the filtered mud cake, and is regularly transported to the slag yard for stacking by a loader, thereby further reducing the environmental burden and meeting the requirements of sustainable development.

[0065] The "connection" and "fixation" mentioned in the description of the present invention can be fixed connection, machining, welding, or mechanical connection. The specific meanings of the above terms in the present invention should be understood according to the specific circumstances.

[0066] In the description of the present invention, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for removing suspended carbon particles from sand made of sandy slate, characterized in that: Comprising a first removal device (1); The first removal device (1) includes a box body (11), a double - helix sand washer (12), a mounting plate (13), a blower (14), a water injection component (15), a left scraping component (16) and a right scraping component (17); the upper part of the box body (11) is open and is inclined, the height of the front end of the box body (11) is higher than that of the rear end, and a sand outlet is provided at the front end; the double - helix sand washer (12) is rotatably arranged in the box body (11), one end is connected to the front end of the box body (11), and the other end is connected to the rear end of the box body (11); the mounting plate (13) is horizontally arranged at the upper part of the box body (11), one end is connected to the left end of the box body (11), and the other end is connected to the right end of the box body (11); the blower (14) is arranged on the mounting plate (13), and the air outlet faces the rear end of the box body (11); the water injection component (15) continuously injects water towards the rear end of the box body (11); the left scraping component (16) and the right scraping component (17) have the same structure and are respectively arranged on the left and right sides of the rear end of the box body (11) to scrape the suspended carbon particles floating at the rear end of the box body (11) from the left and right sides of the box body (11) to the outside of the box body (11).

2. The device for removing suspended carbon particles from sand produced from sandy slate according to claim 1, wherein: It further includes a second removal device. The second removal device (2) has the same structure as the first removal device (1), and the front end of the first removal device (1) is arranged above the rear end of the second removal device (2). After the double - helix sand washer (12) of the first removal device (1) finishes washing the sand material, it transports the sand material to the front end of the first removal device (1), and the sand material falls into the lower second removal device (2) through the sand outlet at the front end of the first removal device (1) for secondary washing.

3. The device for removing suspended carbon particles from sand made of sandy slate according to claim 1 or 2, characterized in that: A vertical drift - blocking plate (3) is provided at the rear end of the box body (11), and the drift - blocking plate (2) is arranged facing the air outlet of the blower (14); overflow grooves (4) are also provided on the left and right sides of the rear end of the box body (11), and the overflow grooves (4) divert the particles scraped by the left scraping component (16) and the right scraping component (17) to an external waste collection pool.

4. The device for removing suspended carbon particles from sand made of sandy slate according to claim 1 or 2, characterized in that: The left scraping component (16) includes a motor (161), a mounting rod (162) and a scraping plate (163); the motor (161) is arranged on the left side of the rear end of the box body (11), the output shaft of the motor (161) is connected to the mounting rod (162), the mounting rod (162) passes through the box body (11), and scraping plates (163) are provided on the side wall of the mounting rod (162).

5. The device for removing suspended carbon particles from sand made of sandy slate according to claim 4, characterized in that: A plurality of the scraping plates (163) are provided and are arranged at equal intervals along the circumferential direction of the mounting rod (162).

6. The device for removing suspended carbon particles from sand made of sandy slate according to claim 1, wherein: A plurality of the blowers (14) are provided and are arranged at equal intervals on the mounting plate (13).

7. The device for removing suspended carbon particles from sand made of sandy slate according to claim 1, characterized in that: It further includes a maintenance platform (5), and the maintenance platform (5) is arranged on one side of the mounting plate (13).

8. A method for using a device for removing suspended carbon particles from sand made of sandy slate as claimed in claim 1, characterized in that: Including the following steps, Step S1, feeding the sand material after sand making and passing through vibration screening into the box body (11) of the first removal device (1). The rear end of the box body (11) remains in a full - water state under the continuous water injection of the water injection component (15). The double - helix sand washer (12) rubs the sand material, and the spray water flow of the water injection component flushes the large - particle carbon impurities separated from the sand material. Step S2: The sand material after primary rubbing enters the rear end of the box body (11). The water flow coverage area should reach more than 80% of the surface area of the sand washing area inside the box body (11) to ensure that the suspended large particle carbon impurities overflow with the water flow.

9. The usage method of a device for removing suspended carbon particles from sand produced from sandy slate as described in claim 8, characterized in that: It includes a second removal device (2). The structure of the second removal device (2) is the same as that of the first removal device (1). The front end of the first removal device (1) is arranged above the rear end of the second removal device (2). After the double - spiral sand washer (12) of the first removal device (1) finishes washing the sand material, it transports the sand material to the front end of the first removal device (1), and the sand material falls into the second removal device (2) below through the sand outlet at the front end of the first removal device (1) for secondary washing. also It includes the following steps: Step S3: The sand material deposited at the bottom of the double - spiral sand washer (12) is pushed by the spiral and flushed into the second removal device (2) by clean water through the sand outlet. The second removal device (2) re - rubs the sand material, generates eddy currents through the rotation of the spiral blades, further destroys the adsorption layer of micron - sized carbon particles, and removes the remaining suspended carbon particles. Step S4: The processed sand material is pushed into a vibrating dehydration screen for dehydration. After dehydration, it is sent to the finished product sand bin through a belt conveyor for storage and standby.

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