Sample grinding scrap iron rapid recovery processing device and method for spectrum detection sample preparation

Abstract

The invention discloses a sample grinding scrap iron rapid recovery processing device and method for spectrum detection sample preparation, and belongs to the technical field of belt type grinding and dry grinding, and the sample grinding scrap iron rapid recovery processing device comprises a scrap suction cover arranged in a contact area of an abrasive belt and a workpiece; an inlet of the flow guide pipeline is communicated with an outlet of the scrap suction cover; an inlet of the grading and separating unit is communicated with an outlet of the flow guide pipeline, and the grading and separating unit is used for carrying out primary separation and particle size grading on the mixture flow to obtain a coarse particle component mainly containing scrap iron and a fine particle component mainly containing dust / abrasive particles; an inlet of the high-gradient magnetic separation unit is communicated with a coarse grain component outlet of the grading separation unit to obtain iron scrap enrichment and non-magnetic or weakly magnetic tailings, and the iron scrap enrichment and the non-magnetic or weakly magnetic tailings are subjected to bin separation closed collection; an inlet of the light impurity removing unit is communicated with a fine particle component outlet of the grading and separating unit, light impurities and dust / abrasive particle impurities are separated, and the light impurities and the dust / abrasive particle impurities are collected in a separated-bin closed mode.

Description

Technical Field

[0001] This invention belongs to the field of belt grinding and dry grinding technology, and particularly relates to a device and method for rapid recovery and processing of grinding iron filings used in the preparation of spectral detection samples. Background Technology

[0002] The particulate matter generated during dry belt grinding is mainly a mixture of coarse iron-based grinding shavings and fine dust, mixed with abrasive belt particles, resin binder debris, and lightweight impurities such as fibers or paper scraps. Common existing treatment methods, such as simple dust collection and filtration or simple pipeline transport followed by unified filtration or separation, have significant drawbacks in practical applications and are prone to causing the following problems:

[0003] (1) Coarse abrasive particles move at high speed in the conveying pipeline, especially at bends and diameter changes, where secondary flow and eddies are easily generated, causing particles to impact the pipe wall and deposit and clump, which not only increases pipeline wear but may also cause blockage and affect the continuous operation of the system. (2) If fine dust enters the terminal filter device directly without pretreatment, the filter media will be rapidly loaded, the system pressure difference will rise sharply, the filtration efficiency will decrease, the maintenance cycle will be shortened, and the operating cost will increase significantly. (3) The recycled iron filings are mixed with abrasive particles, light impurities and dust, which leads to a decrease in metal purity, little recycling value, and difficulty in achieving efficient resource recycling. (4) If the unloading and transfer process is not sealed, it is easy to cause secondary dust to fly, pollute the working environment, and damage the occupational health of operators, which does not meet the requirements of modern clean production and labor protection.

[0004] Therefore, given the complex operating conditions of belt dry grinding processes, characterized by a high proportion of coarse chips and inclusions of abrasive particles and light impurities, there is an urgent need to develop an efficient and systematic processing technology. This technology should encompass multiple processing units, including source collection, stable flow conveying, coarse and fine separation, magnetic separation enrichment, and removal of light impurities and abrasive particles. This will ensure stable system operation while significantly improving the quality and economic value of the recovered materials. Summary of the Invention

[0005] This invention provides a rapid recycling and processing device and method for grinding iron filings used in the preparation of spectroscopic detection samples, which reduces the risk of pipeline deposition and blockage, as well as the load on end filtration and dust removal; improves the purity of iron filings recycling and reduces secondary dust; and achieves graded purification and recycling of coarse iron filings, fine dust / grind particles, and light impurities.

[0006] To achieve the above-mentioned technical objectives, the first objective of this invention is to provide a rapid recovery and processing device for grinding iron filings used in the preparation of spectroscopic detection samples, comprising: A chip suction hood is installed in the contact area between the sanding belt and the workpiece. The inlet of the guide pipe is connected to the outlet of the chip suction hood; The grading and separation unit has its inlet connected to the outlet of the flow guide pipe. It performs primary separation and particle size classification on the mixed flow to obtain a coarse component mainly composed of iron filings and a fine component mainly composed of dust / abrasive particles. The high gradient magnetic separation unit has its inlet connected to the coarse component outlet of the classification and separation unit, resulting in iron filings enriched with non-magnetic or weakly magnetic tailings, which are then collected in sealed compartments. The light impurity removal unit has its inlet connected to the fine-particle component outlet of the graded separation unit, separating light impurities from dust / abrasive impurities and collecting them in sealed compartments.

[0007] Furthermore, the flow guiding pipe is a concentric variable diameter flow guiding pipe, which includes a diameter expansion buffer section, a diameter reduction acceleration section and a flow rectification section in sequence along the flow direction. The flow rectification section is equipped with a flow rectification component, which reduces the impact and stabilizes the flow by expanding the diameter buffer, maintains the carrying and conveying speed by reducing the diameter acceleration, and suppresses eddy current deposition in conjunction with the flow rectification component.

[0008] Furthermore, the diameter expansion ratio of the expanded buffer section is 1.3 to 1.6.

[0009] Furthermore, the length of the expanded diameter buffer section is 120mm to 300mm.

[0010] Furthermore, the contraction angle of the tapering acceleration section is... ~ .

[0011] Furthermore, the length of the rectifier section is 200mm to 600mm, and the rectifier component is one or more of a honeycomb rectifier, a guide plate, or a guide blade.

[0012] Furthermore, the high-gradient magnetic separation unit includes a magnetic source and a high-gradient medium located in the magnetic field, wherein the high-gradient medium is one or more of steel wool, steel wire mesh, toothed plate or corrugated plate.

[0013] Furthermore, the dust collection hood is a slit-type dust collection hood, and the slit width of the slit-type dust collection hood is 8mm to 25mm.

[0014] A second objective of this invention is to provide a method for the rapid recovery and treatment of grinding iron filings used in the preparation of spectroscopic detection samples, comprising: S1. The iron-based metal shavings, dust, abrasive particles and light impurities generated during grinding are sucked into the guide pipe to form a mixed flow. S2. Utilize diversion pipes to transport mixed flow; S3. The mixture flow is subjected to primary separation and particle size classification in the classification and separation unit to obtain a coarse component mainly composed of iron filings and a fine component mainly composed of dust / abrasive particles. S4. The coarse particles are fed into a high gradient magnetic separation unit for magnetic separation enrichment to obtain iron filings enriched with non-magnetic or weakly magnetic tailings. The fine particles are fed into a light impurity removal unit for sieving and / or air separation to separate light impurities from dust / abrasive impurities. The tailings are then incorporated into the light impurity removal unit for further processing and / or returned to a high-gradient magnetic separation unit for re-selection. S5. Collect the iron filings, tailings, dust / abrasive impurities, and light impurities in separate sealed compartments.

[0015] Furthermore, the screen aperture of the light impurity removal unit is 0.5mm to 2.0mm, and / or the separation wind speed of the airflow separation is 4m / s to 8m / s; the screening and airflow separation are performed in series in the order of "screening first and then airflow separation" or "airflow separation first and then screening".

[0016] Compared with the prior art, the present invention has the following technical effects: This invention employs a flow-guiding combination structure of "concentric expansion buffer + concentric contraction acceleration + downstream rectification and vortex suppression" to effectively regulate the dynamic behavior of the fluid, significantly reduce the secondary flow and vortex phenomena caused by the impact and rebound of coarse abrasive debris, thereby suppressing the deposition of materials on the pipe wall and further improving the stability and continuity of material conveying. This invention implements a process path of "grading and diverting first, then targeted treatment" to achieve precise grading of materials before they enter the processing unit. This allows coarse iron filings to be guided to a high-gradient magnetic separation unit for efficient sorting, while fine dust and abrasive particles are allowed to enter a light impurity removal unit for processing. This design significantly reduces the load on the magnetic separation process and the end-of-line filtration system, thereby improving the overall iron filings recovery efficiency and system processing capacity. This invention fully utilizes the high enrichment efficiency of high gradient magnetic separation technology for coarse iron-based grinding chips, and combines it with the re-selection process of tailings or incorporates them into the light impurity removal unit for secondary processing, which can further reduce the amount of abrasive particles entrained, while improving the purity and resource value of the final iron chip product. This invention utilizes screening and / or airflow separation to efficiently remove lightweight impurities such as fibers and paper scraps, and effectively separates abrasive particles from dust, thereby significantly improving the overall quality of recycled materials and the economic efficiency of subsequent reuse. The present invention also adopts a compartmentalized closed structure in the unloading stage and can be equipped with a safety filter to effectively suppress secondary dust generated during the unloading process, while reducing the wear risk caused by the fan sucking in particulate matter, and enhancing the safety and reliability of the system operation. Attached Figure Description

[0017] Figure 1 This is a process flow diagram provided for a preferred embodiment of the present invention; Figure 2This is a schematic diagram of a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of a concentric variable diameter guide pipe structure provided in a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of a high-gradient magnetic separation unit structure provided in a preferred embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, and not all of them. Generally, the embodiments of the present invention described and shown in the accompanying drawings are characteristic technologies and solutions. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 4 A rapid recovery and processing device for grinding iron filings used in the preparation of spectral detection samples mainly includes: a chip suction hood 1, a guide pipe 3, a classification and separation unit 4, a high-gradient magnetic separation unit 5, and a light impurity removal unit 6; wherein: The dust collection hood 1 is installed in the contact area between the sanding belt and the workpiece; a variable frequency fan 2 is installed on the dust collection hood 1; wherein, the dust collection hood 1 is used to collect particulate matter generated in the contact area between the sanding belt and the workpiece at the source, and the hood body and the guide pipe 3 form a continuous and sealed negative pressure suction channel; the negative pressure source is the variable frequency fan 2, and the air inlet of the variable frequency fan 2 is connected to the dust collection hood 1. The system air volume and static pressure are continuously adjustable through variable frequency speed regulation, so as to maintain a stable collection air velocity and conveying air velocity under different grinding loads, different pipeline resistances and separation unit operating conditions, and reduce the risk of missed collection, backflow and pipeline deposition.

[0020] The inlet of the guide pipe 3 is connected to the outlet of the chip suction hood 1; The inlet of the grading and separation unit 4 is connected to the outlet of the flow guiding pipe 3 to perform primary separation and particle size classification on the mixed flow, resulting in a coarse particle component mainly composed of iron filings and a fine particle component mainly composed of dust / abrasive particles. The inlet of the high gradient magnetic separation unit 5 is connected to the coarse component outlet of the classification and separation unit 4 to obtain iron filings enriched with non-magnetic or weakly magnetic tailings, which are then collected in sealed compartments. The inlet of the light impurity removal unit 6 is connected to the fine component outlet of the graded separation unit 4 to separate light impurities from dust / abrasive impurities and collect them in a sealed compartment.

[0021] Working Principle: This invention uses a slit-type dust collection hood in the contact area between the sander belt and the workpiece, applying adjustable negative pressure for source capture. The slit intake of the dust collection hood is arranged along the width of the sander belt and aligned with the contact area. The slit is connected to the collection cavity inside the hood, and the cross-section of the collection cavity smoothly transitions to the outlet along the airflow direction, making the suction velocity distribution at the slit more uniform and reducing local losses. The negative pressure is provided by a variable frequency fan and is continuously adjustable, maintaining an effective capture velocity and stable carrying capacity near the contact area under different dust loads and pipeline resistance variations. The mixture flows through a concentric variable diameter guide pipe, passing sequentially through an expansion buffer section, and... The narrowing acceleration section and downstream rectification section, in conjunction with rectification components, achieve impact reduction and flow stabilization, maintain the carrying and conveying speed, and suppress eddy current deposition. Subsequently, primary separation and particle size classification are performed in the classification and separation unit to obtain a coarse component mainly composed of iron filings and a fine component mainly composed of dust / abrasive particles. The coarse component enters a high-gradient magnetic separation unit to enrich ferromagnetic abrasives and obtain tailings. The fine component enters a light impurity removal unit for screening and / or airflow separation to separate light impurities from dust / abrasive impurities. The tailings are incorporated into the light impurity removal treatment and / or returned to the high-gradient magnetic separation unit for re-selection. Finally, the iron filings enrichment, tailings, dust / abrasive impurities, and light impurities are collected in sealed compartments. This method reduces the risk of pipeline deposition and blockage, reduces the end-filter load, and improves the purity of recovered iron filings.

[0022] To better understand the technical solution of the present invention, a detailed, non-limiting description is provided below: The chip suction hood 1 uses negative pressure collection at the source: the chip suction hood 1 is set in the contact area between the sander belt and the workpiece, and the variable frequency fan 2 is used to apply negative pressure to suck up the sand chips, dust, abrasive particles and light impurities to form a mixed flow. Concentric variable diameter guide flow stabilization and conveying: The mixture flows through the concentric variable diameter guide pipe 3. The guide pipe 3 includes, in sequence along the flow direction, an expansion buffer section 31, a contraction acceleration section 32, and a rectification section 33 located downstream of the contraction acceleration section 32. The rectification section 33 is equipped with a rectification component 34. The expansion buffer section 31 adopts a coaxial expansion structure, which provides a buffer space for the gas-solid two-phase flow carrying coarse particles before entering the subsequent pipe section, reducing the impact and rebound of particles on the pipe wall and the induced local strong turbulence; its expansion ratio is preferably 1.3 to 1.6, and its length is preferably 120 mm to 300 mm. The contraction acceleration section 32 adopts a coaxial contraction structure with a small contraction angle, which is used to restore and maintain the carrying and conveying speed after buffering, and reduce the tendency of deposition at horizontal sections / bends. The rectifying section 33 is used to weaken the secondary flow and vortex structure. It is equipped with a rectifying component 34. By shaping the velocity profile and rotation component, it suppresses eddy deposition and reduces pressure drop fluctuations, thereby improving the continuous transport stability of the airflow containing coarse debris. Primary separation and particle size classification: In the classification and separation unit 4, the mixed flow undergoes primary separation and particle size classification to obtain a coarse component mainly composed of iron filings and a fine component mainly composed of dust / abrasive particles. The coarse component outlet 41 outputs the coarse component mainly composed of iron filings; the fine component outlet 42 outputs the fine component mainly composed of dust / abrasive particles, thereby realizing the subsequent process diversion of "coarse particles into magnetic separation, fine particles into light impurities", reducing mutual interference and load coupling between processing units; High-gradient magnetic separation enrichment: Coarse particles are fed into high-gradient magnetic separation unit 5 for magnetic enrichment. Ferromagnetic / paramagnetic iron filings in the coarse particles are captured on the surface or in the gaps of the high-gradient medium under the action of magnetic force and gradient force, while non-magnetic or weakly magnetic abrasive particles, resin debris, etc. pass through with airflow / gravity to form tailings, resulting in iron filings enriched and non-magnetic or weakly magnetic tailings. Through the operation mode of "continuous feeding + intermittent unloading", unloading can include demagnetization, shaking and / or backflushing, which can reduce media blockage and stabilize the sorting quality while ensuring collection efficiency. Light impurity / abrasive particle removal: Fine particles are fed into the light impurity removal unit 6 for sieving and / or air separation to separate light impurities from dust / abrasive impurities. The tailings are then incorporated into the light impurity removal unit 6 for further processing and / or returned to the high gradient magnetic separation unit 5 for re-selection. Preliminary sieving is achieved according to the geometric particle size, and larger abrasive particles or agglomerates are intercepted and discharged. The separation of light impurities from dust / abrasive particles is achieved by utilizing the differences in the aerodynamic characteristics of the particles (density, shape, terminal settling velocity). Light fibrous impurities are more easily deflected by the airflow to the light impurity outlet 61, while dust / abrasive impurities are collected at the outlet 62.

[0023] Screening and air separation can be arranged in series and can be adjusted to "screen first, then separate" or "separate first, then screen" to adapt to the proportion of light impurities and the particle size distribution of abrasive particles under different working conditions.

[0024] Separate and sealed collection: Iron filings, tailings, dust / abrasive impurities and light impurities are collected separately in sealed compartments.

[0025] In one specific embodiment, the mass ratio of coarse debris to dust in the mixture stream is 8:2±20%.

[0026] In one specific embodiment: the dust suction hood 1 is a slit-type dust suction hood with a slit width of 8mm to 25mm and a distance of 5mm to 15mm from the hood opening to the contact area.

[0027] In one specific embodiment: the negative pressure source is a variable frequency fan 2, and the average intake wind speed at the hood opening is 14m / s to 26m / s.

[0028] In one specific embodiment: the expansion ratio of the expanded diameter buffer section 31 is 1.3–1.6, and / or the length is 120 mm to 300 mm.

[0029] In one specific embodiment: the contraction angle of the tapering acceleration section 32 is 10° to 18°.

[0030] In one specific embodiment: the length of the rectifier section 33 is 200mm to 600mm, and the rectifier component 34 is one or more of a honeycomb rectifier, a guide plate, or a guide blade.

[0031] In one specific embodiment: the graded separation unit 4 includes one or a combination of inertial sedimentation separation and cyclone separation to achieve the separation of the coarse-particle component and the fine-particle component.

[0032] In one specific embodiment: the high gradient magnetic separation unit 5 includes a magnetic source 54 and a high gradient medium 53 located in the magnetic field, wherein the high gradient medium 53 is one or more of steel wool, steel wire mesh, toothed plate or corrugated plate.

[0033] In one specific embodiment: the magnetic induction intensity of the high gradient magnetic separation is 0.6–1.0T, and / or the equivalent magnetic field gradient is 50T / m to 120T / m; the high gradient magnetic separation adopts continuous feeding and intermittent unloading operation, the intermittent unloading includes demagnetization and / or shaking and / or backflushing unloading.

[0034] In a specific embodiment: in the light impurity removal unit 6, the screen aperture of the sieving is 0.5mm to 2.0mm, and / or the separation wind speed of the air separation is 4m / s to 8m / s; the sieving and the air separation are performed in series in the order of "sieving first and then air separation" or "air separation first and then sieving".

[0035] In one specific embodiment: the compartment collection device adopts a closed unloading structure and unloads material through a rotary ash discharge valve, a double flap valve or a gate valve to reduce secondary dust; and / or the recycling system also includes a safety filter 10, and the clean gas from the graded separation unit 4 and / or the light impurity removal unit 6 enters the variable frequency fan and is returned or exhausted after passing through the safety filter 10.

[0036] A method for rapid recovery and treatment of grinding iron filings used in sample preparation for spectral detection includes: S1. The iron-based metal shavings, dust, abrasive particles and light impurities generated during grinding are sucked into the guide pipe 3 by the dust suction hood 1 to form a mixed flow. S2. The mixed flow is transported using the diversion pipe 3; S3. The mixture flow is subjected to primary separation and particle size classification in the classification and separation unit 4 to obtain a coarse particle component mainly composed of iron filings and a fine particle component mainly composed of dust / abrasive particles. S4. The coarse particles are fed into the high gradient magnetic separation unit 5 for magnetic separation enrichment to obtain iron filings enriched with non-magnetic or weakly magnetic tailings. The fine particles are fed into the light impurity removal unit 6 for sieving and / or air separation to separate light impurities from dust / abrasive impurities. The tailings are then incorporated into the light impurity removal unit 6 for further processing and / or returned to the high gradient magnetic separation unit 5 for re-selection. S5. Collect the iron filings, tailings, dust / abrasive impurities, and light impurities in separate sealed compartments.

[0037] Furthermore, the screen aperture of the light impurity removal unit 6 is 0.5mm to 2.0mm, and / or the separation wind speed of the airflow separation is 4m / s to 8m / s; the screening and airflow separation are performed in series in the order of "screening first and then airflow separation" or "airflow separation first and then screening".

[0038] Specific application example: graded purification and recycling at the dry grinding station of a belt grinding machine. In this embodiment, the mixture generated by grinding is mainly composed of coarse grinding chips, mixed with dust, abrasive particles and light impurities, wherein the mass ratio of coarse chips to dust can be 8:2±20%.

[0039] S1. Source Negative Pressure Capture A chip suction hood 1 is installed in the contact area between the abrasive belt and the workpiece. Preferably, the chip suction hood 1 is a slit-type chip suction hood, with the slits arranged along the width of the abrasive belt. The slit width can be 8mm to 25mm, and the distance between the hood opening and the contact area can be 5mm to 15mm. A variable frequency fan 2 can be used as the negative pressure source to control the average suction velocity at the hood opening at 14m / s to 26m / s, drawing in a mixture of abrasive chips, dust, abrasive particles, and light impurities.

[0040] S2. Concentric variable diameter guiding and stabilizing flow conveying The mixture is conveyed through guide pipe 3. Guide pipe 3 is a concentric variable diameter guide pipe, such as... Figure 3 As shown, along the flow direction, it includes, in sequence, an inlet section 30, an expansion buffer section 31, a contraction acceleration section 32, and a rectifier section 33 located downstream of the contraction acceleration section 32. The rectifier section 33 is equipped with a rectifier component 34.

[0041] The expansion buffer section 31 is used to buffer and reduce the impact of the mixed flow containing coarse grinding debris and reduce the local turbulence caused by scouring and rebound; its expansion ratio can be 1.3–1.6 and its length can be 120 mm to 300 mm.

[0042] The tapering acceleration section 32 is used to restore and maintain the carrying and transport speed, reducing the risk of deposition before and after the horizontal section or bend; its tapering angle α can be 10° to 18°.

[0043] The rectifying section 33 is used to weaken the secondary flow and eddies and suppress vortex deposition near the pipe wall; the length of the rectifying section 33 can be 200mm to 600mm, and the rectifying component 34 can be a honeycomb rectifier or a guide plate / guide blade.

[0044] After the diameter reduction, the main pipe velocity can be controlled at 20–32 m / s to maintain the carrying capacity. The specific diameter of the guide pipe 3 can be selected according to the air volume and site layout; this invention is not limited to a fixed pipe diameter. Large-radius elbows are preferred to reduce wall deposits and wear.

[0045] S3. Primary Separation and Particle Size Classification The mixture flows into the classification and separation unit 4 for primary separation and particle size classification. The classification and separation unit 4 may employ a combination of inertial sedimentation separation and / or cyclone separation, so that the coarse particles, mainly composed of iron filings, are discharged from the coarse particle outlet 41, and the fine particles, mainly composed of dust / abrasive particles, are discharged from the fine particle outlet 42, thereby forming a coarse and fine flow.

[0046] S4. High-gradient magnetic separation enrichment Coarse-grained components enter high-gradient magnetic separation unit 5 for magnetic enrichment. For example... Figure 4 As shown, the high-gradient magnetic separation unit 5 includes a magnetic source 54 and a high-gradient medium 53 located in the magnetic field. The high-gradient medium 53 can be one or more combinations of steel wool, steel wire mesh, toothed plates, or corrugated plates. The high-gradient magnetic separation can operate under conditions of magnetic induction intensity of 0.6T to 1.0T and equivalent magnetic field gradient of 50T / m to 120T / m, so that iron filings are discharged from outlet 51, and non-magnetic or weakly magnetic tailings are discharged from outlet 52.

[0047] The magnetic separation operation mode can be continuous feeding combined with intermittent unloading. Intermittent unloading may include demagnetization and / or shaking and / or backflushing unloading to reduce media blockage and stabilize magnetic separation efficiency.

[0048] S5. Removal of light impurities / abrasive particles (including disposal of tailings) Fine particles enter the light impurity removal unit 6 for sieving and / or air separation: The mesh size of the sieve can be 0.5mm to 2.0mm; The sorting velocity for airflow separation can be 4 m / s to 8 m / s; Screening and air separation can be performed in series in the order of "screening first, then air separation" or "air separation first, then screening". The light impurity removal unit 6 discharges light impurities from outlet 61 and discharges dust / abrasive impurities from outlet 62.

[0049] In addition, the tailings can be incorporated into the light impurity removal unit 6 for further removal of light impurities and dust / abrasive particles; or the tailings can be returned to the high gradient magnetic separation unit 5 for re-selection to improve the iron filings recovery rate and purity.

[0050] S6. Compartmentalized, closed-loop gas collection and gas path treatment Iron filings are collected in a sealed manner in metal bin 7; tailings are collected in tailings bin 8; dust / abrasive impurities are collected in dust bin 9; and light impurities are collected separately in a sealed manner. Each discharge port can adopt a sealed discharge structure such as a rotary ash discharge valve, a double flap valve, or a gate valve to reduce secondary dust generation.

[0051] The recycling system can be equipped with a safety filter 10. The clean gas from the graded separation unit 4 and / or the light impurity removal unit 6 enters the fan 2 after passing through the safety filter 10 and is discharged or reused through the return air / exhaust port 11, thereby reducing the risk of dust entering the fan and causing wear.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that any improvements, modifications, substitutions or variations made by those skilled in the art without departing from the principle of the present invention should be considered as being included within the protection scope of the present invention.

Claims

1. A rapid recovery and processing device for grinding iron filings used in the preparation of samples for spectral detection, characterized in that, include: The chip suction hood (1) is installed in the contact area between the sanding belt and the workpiece; The inlet of the guide pipe (3) is connected to the outlet of the chip suction hood (1); The graded separation unit (4) has its inlet connected to the outlet of the guide pipe (3) to perform primary separation and particle size classification on the mixed flow, resulting in a coarse component mainly composed of iron filings and a fine component mainly composed of dust / abrasive particles. The high gradient magnetic separation unit (5) has its inlet connected to the coarse component outlet of the graded separation unit (4) to obtain iron filings enriched with non-magnetic or weakly magnetic tailings, which are then collected in sealed compartments. The light impurity removal unit (6) has its inlet connected to the fine component outlet of the graded separation unit (4), separating light impurities from dust / abrasive impurities and collecting them in a sealed compartment.

2. The rapid recovery and processing device for grinding iron filings used in sample preparation for spectral detection according to claim 1, characterized in that, The flow guide pipe (3) is a concentric variable diameter flow guide pipe, which includes a diameter expansion buffer section (31), a diameter reduction acceleration section (32) and a rectification section (33) in sequence along the flow direction. The rectification section (33) is equipped with a rectification component (34), which reduces the impact and stabilizes the flow by diameter expansion buffer, maintains the carrying and conveying speed by diameter reduction acceleration, and suppresses eddy current deposition in conjunction with the rectification component (34).

3. The rapid recovery and processing device for grinding iron filings used in sample preparation for spectral detection according to claim 2, characterized in that, The diameter expansion ratio of the expansion buffer section (31) is 1.3 to 1.

6.

4. The rapid recovery and processing device for grinding iron filings used in sample preparation for spectral detection according to claim 2, characterized in that, The length of the expanded diameter buffer section (31) is 120mm to 300mm.

5. The rapid recovery and processing device for grinding iron filings used in sample preparation for spectral detection according to claim 2, characterized in that, The contraction angle of the narrowing acceleration section (32) is ~ .

6. The rapid recovery and processing device for grinding iron filings used in sample preparation for spectral detection according to claim 2, characterized in that, The length of the rectifier section (33) is 200mm to 600mm, and the rectifier component (34) is one or more of a honeycomb rectifier, a guide plate, or a guide blade.

7. The apparatus and method for rapid recovery and treatment of grinding iron filings used in the preparation of spectroscopic detection samples according to claim 1, characterized in that, The high gradient magnetic separation unit (5) includes a magnetic source (54) and a high gradient medium (53) located in the magnetic field. The high gradient medium (53) is one or more of steel wool, steel wire mesh, toothed plate or corrugated plate.

8. The apparatus and method for rapid recovery and treatment of grinding iron filings used in the preparation of spectroscopic detection samples according to claim 1, characterized in that, The dust collection hood (1) is a slit-type dust collection hood, and the slit width of the slit-type dust collection hood is 8mm to 25mm.

9. A method for rapid recovery and treatment of grinding iron filings used in the preparation of spectroscopic detection samples, characterized in that, include: S1. Using the dust suction hood (1), the iron-based metal shavings, dust, abrasive particles and light impurities generated during grinding are sucked into the guide pipe (3) to form a mixed flow. S2. Use the diversion pipe (3) to transport the mixed flow; S3. The mixture flow is subjected to primary separation and particle size classification in the classification and separation unit (4) to obtain a coarse particle component mainly composed of iron filings and a fine particle component mainly composed of dust / abrasive particles. S4. The coarse particles are fed into a high gradient magnetic separation unit (5) for magnetic separation enrichment to obtain iron filings and non-magnetic or weakly magnetic tailings. The fine particles are fed into the light impurity removal unit (6) for sieving and / or air separation to separate light impurities from dust / abrasive impurities. The tailings are then incorporated into the light impurity removal unit (6) for processing and / or returned to the high gradient magnetic separation unit (5) for re-selection. S5. Collect the iron filings, tailings, dust / abrasive impurities, and light impurities in separate sealed compartments.

10. The method for rapid recovery and treatment of grinding iron filings used in sample preparation for spectral detection according to claim 1, characterized in that, The screen aperture of the light impurity removal unit (6) is 0.5mm to 2.0mm, and / or the separation wind speed of the airflow separation is 4m / s to 8m / s; the screening and airflow separation are performed in series in the order of "screening first and then airflow separation" or "airflow separation first and then screening".

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