A method for pretreatment of barreled calcium fluoride slag

Abstract

The application discloses a kind of pretreatment methods for barrel-packed calcium fluoride residue, belong to solid waste treatment field, including the following steps: after the calcium fluoride residue solid waste stored in 200L metal barrel is disassembled barrel cover, it is sent to crushing device by conveying device, special tool of crushing device is used to make solid waste and material barrel separate, and solid waste is crushed, solid material is crushed and enters drying device, remove the moisture of material, after drying, material is sent to packaging device after cooling, material is quantitatively loaded into ton bag and is packaged, empty metal barrel is detected, and is torn into pieces by tearing device when broken and discarded, and is pressed into metal block and loaded into material barrel and temporarily stored.The pretreatment method for barrel-packed calcium fluoride residue, realizes that barrel-packed calcium fluoride residue is handled to the full automation of landfill requirement, remote operation, fundamentally solves the problem that barrel-packed calcium fluoride residue is long-term stacked, improves plant environment, reduces safety risk, operating cost and production energy consumption.

Description

Technical Field

[0001] This invention relates to the field of solid waste treatment, and more particularly to a pretreatment method for drummed calcium fluoride slag. Background Technology

[0002] Calcium fluoride is an inorganic compound with the chemical formula CaF₂. It is a colorless crystal or white powder. It is sparingly soluble in water, slightly soluble in inorganic acids, and reacts with hot concentrated sulfuric acid to produce hydrofluoric acid. In experiments, calcium fluoride is generally prepared by reacting calcium carbonate with hydrofluoric acid or by repeatedly treating fluorite powder with concentrated hydrochloric acid or hydrofluoric acid. Naturally occurring calcium fluoride minerals are fluorite or fluorspar, often appearing in gray, yellow, green, or purple colors, sometimes colorless and transparent with a vitreous luster. It is brittle and exhibits significant fluorescence. Very pure fluorite is used to make special lenses. Fluorite is mainly used as a flux in metal smelting; when drinking water contains 1-1.5 ppm of calcium fluoride, it can help prevent dental diseases. Calcium fluoride has a wide range of uses, and with the advancement of science and technology, its application prospects are becoming increasingly broad. It is mainly used in the metallurgical, chemical, and building materials industries, and secondarily in light industry, optics, engraving, and defense industries. Therefore, based on the requirements of its use, China's fluorite mineral products mainly fall into four major categories: fluorite lumps, fluorite concentrate, fluorite powder, and optical and engraving fluorite.

[0003] Currently, the radioactive fluoride-containing wastewater generated by domestic uranium conversion, uranium enrichment, and element manufacturing plants is mainly treated by lime precipitation for fluoride removal. This method produces a large amount of calcium fluoride slag, which does not meet the receiving requirements of extremely low-level radioactive waste disposal sites. Most companies directly store it in 200L metal drums. The drummed calcium fluoride slag, left on the plant premises for extended periods, solidifies due to moisture evaporation, adhering to the inner walls of the metal drums, increasing the difficulty of its disposal. This drummed waste occupies a large area of ​​the plant, affecting its appearance and future development, and does not comply with the requirements for the temporary storage of radioactive waste, posing safety and environmental problems. Summary of the Invention

[0004] To address the safety and environmental issues arising from non-compliance with the requirements for the temporary storage of radioactive waste, this invention provides a pretreatment method for drummed calcium fluoride slag, the technical solution of which is as follows:

[0005] A pretreatment method for drummed calcium fluoride slag includes the following steps:

[0006] S1 A 200L metal drum containing calcium fluoride solid waste is transported to the factory by a drum forklift and placed at the selected position on the roller conveyor. The drum lid is removed manually, and different treatment methods are selected according to the state of the material after the lid is removed.

[0007] S2-1 If the material in the bucket is determined to be wet material, which is calcium fluoride that has just been transported from the production line and is in the form of granules or small clumps, it is poured directly out of the bucket. The waste bucket is then transported to the material bucket translation and tilting pouring mechanism via the roller conveyor. The material bucket translation and tilting pouring mechanism lifts the waste bucket to the height of the dryer inlet and pours the material into the dryer.

[0008] S2-2 If the material inside the barrel is determined to be dry material, which is long-stored barrelled calcium fluoride that has clumped and stuck to the barrel, making it impossible to pour out, the waste barrel needs to be transported to the elevator by the roller conveyor. The elevator lifts the waste barrel to a high position, and the truss transfer mechanism grabs the waste barrel and sends it into the lifting and pressing device. The lifting and pressing device separates the dry material inside the barrel, and the material falls into the extruder. The extruder coarsely crushes the material, and after the screening metal transfer device magnetically separates the fine metal fragments from the material, it enters the crusher for further crushing, and then is sent to the dryer through the tubular chain conveyor.

[0009] S3 The material entering the dryer has its moisture removed by evaporation through the drying mechanism;

[0010] After being dried in a dryer, the S4 material reaches a temperature of around 100℃. After being cooled by air cooling, the material is cooled to <50℃ and then fed into an automatic packaging device via a tubular chain conveyor for metering and packaging into ton bags.

[0011] The metal drums emptied of dry materials in S5 are no longer reusable. The metal drums are fed into the metal shredder via a gantry transfer mechanism. After being processed by the shredder, the metal drums are...

[0012] The shredded metal fragments from S6 fall into a metal hydraulic press, are pressed into metal blocks, and then loaded into 200L metal drums using a metal transfer truss.

[0013] The exhaust gas generated by the S7 dryer passes through the drying production line, where dust is removed from the exhaust gas generated during the drying process. The purified exhaust gas is then connected to the plant's local exhaust system.

[0014] The exhaust gas generated by S8 cooling materials is collected by an exhaust gas collection system to remove dust from the exhaust gas generated during the drying process. The purified exhaust gas is then connected to the plant's local exhaust system.

[0015] The treated calcium fluoride slag meets the requirements for landfill disposal, solving the problem of long-term stockpiling of calcium fluoride slag, improving the plant environment, reducing safety risks, and contributing to the sustainable development of uranium conversion, uranium enrichment, and component manufacturing plants. Through the automatic crushing, drying, cooling, metering, and packaging processes of the calcium fluoride slag in drums, it meets the acceptance requirements for landfill disposal of extremely low-level solid waste, thereby solving the problem of stockpiling drummed calcium fluoride slag within the plant.

[0016] Preferably, in step S2-1, the metal bucket emptying the wet material is returned via the original route through the roller conveyor for recycling. In step S2-2, the particle size of the material after coarse crushing is less than 100mm, and after further crushing in the pulverizer, the particle size of the material is less than or equal to 10mm.

[0017] Preferably, in step S3, the drying temperature of the dryer is set to 300℃, the processing capacity is 1.5t / h, and the exhaust gas containing dust and steam generated during the drying process enters the exhaust gas collection system.

[0018] Preferably, in step S4, once the ton bag reaches 2t, no more material is put into the ton bag, the ton bag begins to be sealed, and after sealing, it is transported to a designated location by a conveyor unit, and then transported to a warehouse for temporary storage by an electric forklift.

[0019] Preferably, the iron sheet shredded by the shredder in step S5 is 5-8 cm long and 3-4 cm wide.

[0020] Preferably, in step S6, the forklift carrying the drum delivers the full metal drum to the warehouse for temporary storage, where it is pressed to 10-20cm by a metal hydraulic press, and the metal drum contains 5-6 metal blocks.

[0021] Preferably, the drying production line includes a baffle dust collector, a cyclone separator, a water film dust collector, and a fan. The dust-containing gas generated by the dryer from the drying material passes through the baffle dust collector, the cyclone separator, and the water film dust collector. The baffle dust collector is used for coarse filtration to filter dust particles with a diameter of 30μm or larger. The cyclone separator is used to further filter solid particles of 5-30μm.

[0022] Preferably, the exhaust gas collection system includes a baffle dust collector, a bag dust collector, a water film dust collector, and a fan. Dust gas generated during the material cooling process passes through the baffle dust collector, the bag dust collector, and the water film dust collector.

[0023] Preferably, the air volume required for material air cooling fully utilizes the air volume of the partial exhaust ports set at the crushing, metering and bagging points throughout the entire system.

[0024] Preferably, the water film dust collector completely removes the solid dust remaining in the system. The dust-laden gas exchanges heat when passing through the water film dust collector, thereby cooling and removing dust. The water temperature is regulated by a matching plate heat exchanger and controlled below 50°C.

[0025] This method effectively separates damaged, unrecyclable metal drums from calcium fluoride slag, then shreds and compresses them into blocks to achieve solid waste compression and volume reduction. It can handle both dry slag stored for extended periods and wet slag generated on the production line. Different processing technologies are used depending on the incoming material: dry slag undergoes a "compression separation + crushing + drying + packaging" process, while wet slag undergoes a "discharging + drying + packaging" process. A single device enables separate processing of different types of slag, saving energy and improving processing efficiency.

[0026] Beneficial effects:

[0027] The beneficial effects of adopting the technical solution of this invention are as follows:

[0028] 1. This pretreatment method for drummed calcium fluoride slag ensures that the treated slag meets landfill disposal requirements, solves the problem of long-term stockpiling of calcium fluoride slag, improves the plant environment, reduces safety risks, and is conducive to the sustainable development of uranium conversion, uranium enrichment, and component manufacturing plants. Through automatic crushing, drying, cooling, metering, and packaging processes, the slag in the drums meets the acceptance requirements for landfill disposal of extremely low-level radioactive solid waste, thereby solving the problem of stockpiling drummed calcium fluoride slag within the plant.

[0029] 2. This pretreatment method for drummed calcium fluoride slag effectively separates the damaged, non-recyclable metal drums from the calcium fluoride slag, and then shreds and compresses them into blocks to achieve the purpose of compressing and reducing the volume of solid waste. This method can not only process dry slag that has been stored for a long time, but also process wet slag generated on the production line. Different processing technologies are used according to the different incoming materials. For dry slag, a processing flow of "extrusion separation + crushing + drying + packaging" is used, and for wet slag, a processing flow of "pouring + drying + packaging" is used. A single device is used to achieve classified and separate processing, saving energy and improving processing efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a process flow diagram of a pretreatment method for drummed calcium fluoride slag according to the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. 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 represent 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.

[0033] like Figure 1 As shown, a pretreatment method for drummed calcium fluoride slag includes the following steps:

[0034] S1 The 200L metal drum containing calcium fluoride solid waste is transported to the factory by a drum forklift and placed in the selected position on the roller line. The drum lid is then removed manually.

[0035] In this embodiment, after removing the bucket lid, different processing methods are selected according to the state of the material. For wet materials, step S2-1 is performed, and for dry materials, step S2-2 is performed.

[0036] S2-1 If the material in the bucket is determined to be wet material, which is calcium fluoride that has just been transported from the production line and is in the form of granules or small clumps, it is poured directly out of the bucket. The waste bucket is then transported to the material bucket translation and tilting pouring mechanism via the roller conveyor. The material bucket translation and tilting pouring mechanism lifts the waste bucket to the height of the dryer inlet and pours the material into the dryer.

[0037] In this embodiment, the metal drums containing emptied wet materials are returned via the same route on the roller conveyor for recycling.

[0038] S2-2 If the material inside the barrel is determined to be dry material, which is long-stored barrelled calcium fluoride that has clumped and stuck to the barrel, making it impossible to pour out, the waste barrel needs to be transported to the elevator by the roller conveyor. The elevator lifts the waste barrel to a high position, and the truss transfer mechanism grabs the waste barrel and sends it into the lifting and pressing device. The lifting and pressing device separates the dry material inside the barrel, and the material falls into the extruder. The extruder coarsely crushes the material, and after the screening metal transfer device magnetically separates the fine metal fragments from the material, it enters the crusher for further crushing, and then is sent to the dryer through the tubular chain conveyor.

[0039] In this embodiment, the particle size of the material after coarse crushing is less than 100 mm, and the particle size of the material after further crushing in the pulverizer is less than or equal to 10 mm.

[0040] S3 The material entering the dryer is evaporated by the drying mechanism to remove the moisture contained in the material. The exhaust gas containing dust and steam generated during the drying process enters the exhaust gas collection system.

[0041] In this embodiment, the drying temperature of the dryer is set to 300℃, and the processing capacity is 1.5t / h, so as to quickly complete the drying of the material;

[0042] After being dried in a dryer, the S4 material reaches a temperature of around 100℃. After being cooled by air cooling, the material is cooled to <50℃ and then fed into an automatic packaging device via a tubular chain conveyor for metering and packaging into ton bags.

[0043] In this embodiment, once the ton bag reaches 2t, no more material is added to the ton bag. That is, each ton bag stores 2t of material. The ton bag is then sealed. After sealing, it is transported to a designated location by a conveyor unit and then transported to a warehouse for temporary storage by an electric forklift.

[0044] The metal drums emptied of dry materials in S5 are no longer reusable and are fed into the metal shredder via a gantry transfer mechanism.

[0045] In this embodiment, the shredded iron sheet is 5-8cm long and 3-4cm wide.

[0046] The shredded metal fragments fall into a metal hydraulic press, are pressed into metal blocks, and then loaded into 200L metal drums using a metal transfer truss. A forklift carrying the drums then delivers the full metal drums to the warehouse for temporary storage.

[0047] In this embodiment, the metal blocks are pressed to 10-20cm using a metal hydraulic press, and then packed into a metal drum containing 5-6 metal blocks.

[0048] The exhaust gas generated by the S7 dryer passes through the drying production line, where dust is removed from the exhaust gas generated during the drying process. The purified exhaust gas is then connected to the plant's local exhaust system. The drying production line includes a baffle dust collector, a cyclone separator, a water film dust collector, and a fan.

[0049] In this embodiment, the dust-containing gas generated by the dryer during the drying of materials passes through a baffle dust collector, a cyclone separator, and a water film dust collector, which can remove 99% of the dust in the exhaust gas. The baffle dust collector is used for coarse filtration by settling to filter dust particles with a diameter of 30μm or larger; the cyclone dust collector is used to further filter solid particles of 5-30μm.

[0050] S8 fully utilizes the airflow from the partial exhaust ports at the crushing and metering bagging points within the entire system to cool the materials. The generated exhaust gas removes dust through an exhaust gas collection system, which includes a baffle dust collector, a bag filter, a water film dust collector, and a fan. The dust generated during the material cooling process passes through the baffle dust collector, bag filter, and water film dust collector, which can remove 99% of the dust from the exhaust gas.

[0051] In this embodiment, the water film dust collector thoroughly removes residual solid dust from the system. Dust-laden gas exchanges heat as it passes through the water film dust collector, achieving cooling and dust removal. The water temperature is regulated by a matching plate heat exchanger, maintaining it below 50°C. The pretreatment of drummed calcium fluoride slag involves separating the stored drummed calcium fluoride slag from the metal drums, followed by crushing, drying, and packaging to meet the requirements for extremely low-level radioactive waste landfill disposal. Damaged, non-recyclable metal drums are shredded and compressed into metal blocks.

[0052] (1) Process for treating barrelled calcium fluoride slag

[0053] After the lid of a 200L metal drum containing calcium fluoride slag solid waste is manually removed, a truss transfer mechanism grabs the waste drum, moves it horizontally above a lifting and pressing device, flips it 180°, and lowers it into the device. The lifting and pressing device crushes the waste drum and its contents; simultaneously, it strikes the bottom of the drum to separate the material from the metal drum, causing it to fall into the extruder below. The extruder performs preliminary crushing on the large pieces of material, resulting in particles smaller than 100mm. The coarsely crushed material is then screened to separate metal fragments. The non-metallic waste enters a hammer mill for secondary crushing, reducing the particle size to less than 10mm. The finely crushed non-metallic waste is pneumatically conveyed to a dryer via a tubular chain conveyor. The crushed granular calcium fluoride slag is then dried in the dryer to achieve a moisture content of ≤1%, before being sent to an automatic packaging system. The exhaust gas containing dust and steam generated during the drying process is filtered and washed before being discharged. After drying, the material is cooled and sent to the automatic packaging device with a hopper. The automatic packaging device quantitatively fills the material into 2t ton bags and seals them, and then the bags are sent out of the system by roller conveyor.

[0054] (2) Waste metal drum treatment process

[0055] The scrap metal drums are transported to a designated location via a gantry transfer mechanism. The grippers release, allowing the drums to fall into the shredder, which breaks them into metal fragments. These fragments fall directly into the press mold, where the press compresses them into metal blocks. The metal blocks are then placed into the metal drums via a transfer gantry. Finally, the drums are conveyed out via a roller conveyor and picked up by a forklift.

[0056] (3) Two different treatment processes for waste residue

[0057] Two different processing procedures are adopted to address the different physical properties of dry and wet slag. The dryer activates the corresponding drying program based on the different states of the dry and wet slag, achieving drying by adjusting the material residence time and the heating power of the silicon carbide rods. When the incoming material is wet slag, it can be directly poured into the dryer for high-power drying. The empty container is returned via the feeding unit for recycling. When the incoming material is dry slag, the feeding unit transports the waste container to the elevator inlet. The elevator's container insertion device lifts the waste container to a designated position, where it connects with the truss transfer mechanism. The waste container is then separated from the container, and the slag is crushed to a specified size before entering the dryer for low-power drying.

[0058] Example:

[0059] S1:

[0060] The 200L metal drum containing calcium fluoride solid waste is transported to the factory by a drum forklift and placed at the selected position on the roller conveyor. The drum lid is removed manually, and different treatment methods are selected according to the state of the material after the lid is removed.

[0061] S2:

[0062] If the material in the bucket is determined to be wet material, which is calcium fluoride that has just been transported from the production line and is in the form of granules or small clumps, it is poured directly out of the bucket. The waste bucket is then transported to the material bucket translation and tilting unloading mechanism via the roller conveyor. The material bucket translation and tilting unloading mechanism lifts the waste bucket to the height of the dryer inlet and pours the material into the dryer. The empty metal bucket containing the wet material is then returned via the roller conveyor for recycling.

[0063] If the material inside the bucket is determined to be dry material, which is long-stored bottled calcium fluoride that has clumped together and stuck to the bucket, making it impossible to pour out, the waste bucket needs to be transported to the elevator by a roller conveyor. The elevator lifts the waste bucket to a high position, and the truss transfer mechanism grabs the waste bucket and sends it into the lifting and extrusion device. The lifting and extrusion device separates the dry material from the bucket, and the material falls into the extruder. The extruder coarsely crushes the material, and after coarse crushing, the particle size of the material is less than 100mm. After passing through the screening metal transfer device, the fine metal fragments in the material are separated by magnetic separation. Then, it enters the pulverizer to be crushed to a particle size of less than or equal to 10mm, and then it is sent into the dryer through a tubular chain conveyor.

[0064] S3:

[0065] The material entering the dryer has its moisture removed by evaporation through the drying mechanism. The drying temperature of the dryer is set at 300℃, and the processing capacity is 1.5t / h. The exhaust gas containing dust and steam generated during the drying process enters the exhaust gas collection system.

[0066] S4:

[0067] After the material is dried in the dryer at a temperature of about 100℃, it is cooled to <50℃ by air cooling. Then it is fed into the automatic packaging device by the tubular chain conveyor to be metered and packaged into ton bags. After reaching 2t, the material no longer enters the ton bags and the ton bags are sealed. After sealing, the material is transported to the designated location by the conveyor unit and then transported to the warehouse for temporary storage by electric forklift.

[0068] S5:

[0069] The metal drums that have been emptied of dry materials can no longer be reused. The metal drums are fed into the metal shredder through a truss transfer mechanism. After being processed by the shredder, the shredded iron pieces are 5-8cm long and 3-4cm wide.

[0070] S6:

[0071] The shredded metal fragments fall into a metal hydraulic press, are pressed into metal blocks, and then loaded into 200L metal drums using a metal transfer truss. A forklift carrying the drums delivers the full metal drums to the warehouse for temporary storage. The metal hydraulic press then presses the drums to 10-20cm, and each metal drum contains 5-6 metal blocks.

[0072] S7:

[0073] The exhaust gas generated by the dryer passes through the drying production line, where dust is removed from the exhaust gas produced during the drying process. The purified exhaust gas is then connected to the plant's local exhaust system. The drying production line includes a baffle dust collector, a cyclone separator, a water film dust collector, and a fan. The dust-containing gas generated by the dryer during the drying process passes through the baffle dust collector, cyclone separator, and water film dust collector, which can remove 99% of the dust from the exhaust gas. The baffle dust collector is used for coarse filtration, filtering dust particles with a diameter of 30μm or larger; the cyclone dust collector is used for further filtration of solid particles with a diameter of 5-30μm.

[0074] S8:

[0075] The system fully utilizes the airflow from the partial exhaust vents at the crushing, metering, and bagging stages to cool the materials. The resulting exhaust gas is then treated by a dust collection system, which includes a baffle dust collector, a bag filter, a water film dust collector, and a fan. The dust-laden gas generated during material cooling is treated by the baffle dust collector, bag filter, and water film dust collector, which removes 99% of the dust from the exhaust gas. The water film dust collector thoroughly removes any remaining solid dust from the system. The dust-laden gas exchanges heat as it passes through the water film dust collector, achieving cooling and dust removal. The water temperature is regulated by a matching plate heat exchanger and controlled below 50℃.

[0076] This invention enables treated calcium fluoride slag to meet landfill disposal requirements, solving the problem of long-term stockpiling of calcium fluoride slag, improving the plant environment, reducing safety risks, and promoting the sustainable development of uranium conversion, uranium enrichment, and component manufacturing plants. Through automatic crushing, drying, cooling, metering, and packaging processes of the calcium fluoride slag in drums, it meets the acceptance requirements for landfill disposal of extremely low-level radioactive solid waste, thereby solving the problem of stockpiling drummed calcium fluoride slag within the plant. It can effectively separate damaged and unrecyclable metal drums from the calcium fluoride slag, and then shred and compress them into blocks to achieve the purpose of compressing and reducing the volume of solid waste. This method can not only process dry slag that has been stored for a long time, but also wet slag generated on the production line. Different processing technologies are used depending on the incoming material. For dry slag, a processing flow of "extrusion separation + crushing + drying + packaging" is used, while for wet slag, a processing flow of "pouring + drying + packaging" is used. A single device is used to achieve classified and separate processing, saving energy and improving processing efficiency.

[0077] This invention is applicable to the fully automated processing of extremely low-level radioactive non-metallic drummed solid waste, including crushing, drying, packaging, and compression and volume reduction of waste metal drums.

[0078] This invention solves the problem of long-term stockpiling of calcium fluoride slag, improves the operating environment, enhances the level of automation, and is conducive to the sustainable development of uranium conversion, uranium enrichment, and component manufacturing plants.

[0079] This invention can also be applied to the fully automated operation of crushing, drying, and packaging processes for other solid materials.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A pretreatment method for drummed calcium fluoride slag, characterized in that, Includes the following steps: S1 A 200L metal drum containing calcium fluoride solid waste is transported to the factory by a drum forklift and placed at the selected position on the roller conveyor. The drum lid is removed manually, and different treatment methods are selected according to the state of the material after the lid is removed. S2-1 If the material in the bucket is determined to be wet material, which is calcium fluoride that has just been transported from the production line and is in the form of granules or small clumps, it is poured directly out of the bucket. The waste bucket is then transported to the material bucket translation and tilting pouring mechanism via the roller conveyor. The material bucket translation and tilting pouring mechanism lifts the waste bucket to the height of the dryer inlet and pours the material into the dryer. S2-2 If the material inside the barrel is determined to be dry material, which is long-stored barrelled calcium fluoride that has clumped and stuck to the barrel, making it impossible to pour out, the waste barrel needs to be transported to the elevator by the roller conveyor. The elevator lifts the waste barrel to a high position, and the truss transfer mechanism grabs the waste barrel and sends it into the lifting and pressing device. The lifting and pressing device separates the dry material inside the barrel, and the material falls into the extruder. The extruder coarsely crushes the material, and after the screening metal transfer device magnetically separates the fine metal fragments from the material, it enters the crusher for further crushing, and then is sent to the dryer through the tubular chain conveyor. S3 The material entering the dryer has its moisture removed by evaporation through the drying mechanism; After being dried in a dryer, the S4 material reaches a temperature of around 100℃. After being cooled by air cooling, the material is cooled to <50℃ and then fed into an automatic packaging device via a tubular chain conveyor for metering and packaging into ton bags. The metal drums emptied of dry materials in S5 are no longer reusable. The metal drums are fed into the metal shredder via a gantry transfer mechanism. After being processed by the shredder, the metal drums are... The shredded metal fragments from S6 fall into a metal hydraulic press, are pressed into metal blocks, and then loaded into 200L metal drums using a metal transfer truss. The exhaust gas generated by the S7 dryer passes through the drying production line, where dust is removed from the exhaust gas generated during the drying process, and the purified exhaust gas is then connected to the plant's local exhaust system. After the S8 cools the material with air, the exhaust gas generated is collected by an exhaust gas collection system to remove dust from the exhaust gas generated during the cooling process. The purified exhaust gas is then connected to the plant's local exhaust system.

2. The pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, In step S2-1, the metal bucket containing the emptied wet material is returned via the original route through the roller conveyor for recycling. In step S2-2, the particle size of the material after coarse crushing is less than 100mm, and after further crushing in the pulverizer, the particle size of the material is less than or equal to 10mm.

3. The pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, In step S3, the drying temperature of the dryer is set to 300℃ and the processing capacity is 1.5t / h. The exhaust gas containing dust and steam generated during the drying process enters the exhaust gas collection system.

4. The pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, In step S4, once the ton bag reaches 2t, no more material is put into the ton bag, and the ton bag begins to be sealed. After sealing, it is transported to the designated location by the conveyor unit, and then transported to the warehouse for temporary storage by an electric forklift.

5. A pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, In step S5, the shredded iron sheet is 5-8cm long and 3-4cm wide.

6. A pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, In step S6, the forklift carrying the drum delivers the full metal drum to the warehouse for temporary storage. The drum is then pressed to 10-20cm by a metal hydraulic press, and 5-6 metal blocks are placed inside each drum.

7. A pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, The drying production line includes a baffle dust collector, a cyclone separator, a water film dust collector, and a fan. The dust-containing gas generated by the dryer from the drying material passes through the baffle dust collector, the cyclone separator, and the water film dust collector. The baffle dust collector is used for coarse filtration to filter dust particles with a diameter of 30μm or larger. The cyclone separator is used to further filter solid particles of 5-30μm.

8. A pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, The exhaust gas collection system includes a baffle dust collector, a bag dust collector, a water film dust collector, and a fan. The generated dust gas passes through the baffle dust collector, the bag dust collector, and the water film dust collector.

9. A pretreatment method for drummed calcium fluoride slag according to claim 1, characterized in that, The air volume required for material air cooling fully utilizes the air volume of the partial exhaust ports set at the crushing, metering and bagging points throughout the entire system.

10. A pretreatment method for drummed calcium fluoride slag according to claim 7, characterized in that, The water film dust collector completely removes the solid dust remaining in the system. The dust-laden gas exchanges heat when passing through the water film dust collector, thus cooling and removing dust. The water temperature is regulated by the matching plate heat exchanger and controlled below 50℃.

Images