Ultrafast cooling dry treatment process method for stainless steel liquid slag

Abstract

The invention discloses an ultrafast cooling dry treatment process method for stainless steel liquid slag. Comprising the following steps: conveying a slag tank filled with stainless steel liquid slag to a working position of a slag turning machine, primarily crushing, rolling and pushing materials to a receiving port of a grate cooler by a roller crusher, primarily cooling the materials by using the stainless steel liquid slag of the grate cooler, and conveying the materials to a next slag cooler for cooling; and the materials are cooled again through the slag cooler and conveyed to a stainless steel slag secondary treatment production line. The method has the beneficial effects that the stainless steel slag primary treatment process production line and the stainless steel slag secondary treatment process production line are both subjected to dry treatment, water cooling is not needed, the water content of the stainless steel slag tailing product is further reduced, the whole production process line does not generate industrial production wastewater, an industrial wastewater treatment procedure is not needed, and the production cost is reduced. Therefore, the construction and operation costs of wastewater treatment facilities are reduced, and the method has the advantage that the surrounding environment is not easily polluted.

Description

Technical Field

[0001] The present invention relates to the technical field of stainless steel liquid slag treatment methods, and particularly relates to an ultra-fast cooling dry treatment process method for stainless steel liquid slag. Background Art

[0002] Stainless steel is a steel alloy that is widely used in tableware, watch cases, musical instruments, and air defense industries, with a wide range of application fields and huge market demands. Therefore, in the process of large-scale mass production, improving the production efficiency of stainless steel is particularly important for enterprise operation. A large amount of steel slag is generated during the smelting process of stainless steel. These steel slags cannot be directly used to manufacture products, but the steel slags contain useful metal elements. Therefore, it is necessary to separate and recover the useful metal elements in the steel slags.

[0003] The Chinese patent application document with the publication number CN118580004A discloses a method for separating slag powder during the primary and secondary treatment of stainless steel slag. In the primary treatment of stainless steel slag, the cooling method is more economical. Using a slag pan to hold the slag is convenient for controlling the water injection amount, and natural cooling and water injection cooling methods are adopted. For the secondary treatment production line, no industrial wastewater is generated during the entire production process, and there is no need to set up an industrial wastewater treatment process. Secondly, the production process line for treating stainless steel slag is a dry process. Compared with the wet process for treating stainless steel slag, the obtained stainless steel slag tail slag product has a low moisture content and is more popular in the building materials and cement market. The product with a low moisture content does not need to go through the drying and incineration treatment processes subsequently, reducing the risk of trivalent chromium being converted into hexavalent chromium at high temperatures. In the workshop of the secondary treatment production line for stainless steel slag, dust extraction points are set at the material dropping points of the belt conveyors for each process. An airtight material conveying device is used outside the workshop, and a dust removal system is set during the loading and sales process.

[0004] The temperature of the stainless steel slag generated after smelting is relatively high, reaching above 1300°C. Therefore, it is necessary to cool the steel slag before recycling and treatment. In the traditional wet treatment process of stainless steel slag, water injection cooling is adopted, and a large amount of wastewater is generated during the cooling process, requiring additional wastewater treatment equipment for wastewater treatment. And during the long-term production process, the wastewater is also prone to seep into the ground through the cracks in the equipment and the ground during the flow process, which is likely to cause pollution to the surrounding environment. The water injection cooling treatment method adopted in the above-mentioned method for separating slag powder during the primary and secondary treatment of stainless steel slag also has the technical problem of being likely to cause pollution to the surrounding environment as the prior art. Summary of the Invention

[0005] To solve the above technical problems, the object of the present invention is to provide a dry processing process method for ultra-fast cooling of stainless steel liquid slag, which includes the following steps: transporting the slag ladle containing stainless steel liquid slag to the working position of the slag turning machine, initially crushing and rolling the material by a roll crusher and pushing it to the receiving opening of the grate cooler, using the grate cooler to cool the stainless steel liquid slag for the first time and transporting it to the next-stage slag cooler for cooling, and using the slag cooler to cool the material again and transporting it to the secondary processing production line of stainless steel slag. This dry processing process method for ultra-fast cooling of stainless steel liquid slag has the advantage of not easily polluting the surrounding environment.

[0006] To achieve the above object of the invention, the technical solution adopted by the present invention is as follows:

[0007] A dry processing process method for ultra-fast cooling of stainless steel liquid slag, which includes the following steps:

[0008] S1: Using a crane to lift the slag ladle containing stainless steel liquid slag to the working position of the slag turning machine. The temperature of the stainless steel liquid slag is 1300°C - 1500°C. The slag turning machine tilts the slag ladle to pour the slag onto the working surface of the roll crusher;

[0009] S2: The roll crusher initially crushes and rolls the material obtained in step S1 and pushes it to the receiving opening of the grate cooler. After being pushed by the roll crusher, the temperature of the stainless steel liquid slag is controlled at 1100°C - 1300°C, and the material remains in a liquid state;

[0010] S3: Using the grate cooler to cool the stainless steel liquid slag with a temperature of 1100°C - 1300°C in S2 for the first time and transporting it to the next-stage slag cooler for cooling. After the first cooling by the grate cooler, the temperature of the material is 500°C - 700°C, and the material mainly presents as solid particles with a particle size ≤ 100 mm. The cooling medium used for the stainless steel liquid slag on the grate cooler is compressed air;

[0011] S4: Using the slag cooler to cool the material obtained in step S3 again and transporting it to the secondary processing production line of stainless steel slag. After being cooled by the slag cooler, the temperature of the material is 70°C - 120°C, and the particle size of the discharged material ≤ 90 mm.

[0012] Preferably, after the step S4, the following steps are further included:

[0013] S5: The secondary processing line of stainless steel slag receives and processes the material after step S4. The cooled material is transported by the first belt conveyor to the receiving point of the first vibrating screen. The aperture of the sieve holes of the first vibrating screen is 5 mm. The oversize material obtained is transported to the receiving opening of the rod mill by the second belt conveyor, and the undersize material obtained is transported to the receiving opening of the first-stage magnetic separator by the third belt conveyor and the fourth belt conveyor.

[0014] Preferably, after the step S5, the following steps are further included:

[0015] S6: The rod mill grinds the oversize material obtained in step S5 until the particle size of the material is ≤20 mm, and then discharges it to the fourth belt conveyor through the discharge port of the rod mill, and is conveyed by the fourth belt conveyor to the receiving point of the first-stage magnetic separator.

[0016] Preferably, after the step S5, the following steps are further included:

[0017] S7: Conduct primary magnetic separation on the undersize material in step S5 and the material after grinding in step 6. The magnetic induction intensity of the magnetic separation equipment is 5500 - 6500 GS. The magnetic materials obtained by magnetic separation are conveyed by the fifth belt conveyor to the magnetic separation powder storage yard for storage. The remaining non-magnetic materials of the magnetic separator are conveyed to the second vibrating screen through the No. 6 belt conveyor.

[0018] Preferably, after the step S5, the following steps are further included:

[0019] S8: Screen the non-magnetic materials obtained in step S7. The second vibrating screen screens out the alloy steel blocks that cannot be ground. The screen hole diameter of the second vibrating screen is 5 mm. The particle size of the oversize alloy steel blocks obtained is 5 mm - 20 mm. The alloy steel blocks are conveyed to the alloy steel block storage yard for storage through the No. 7 belt conveyor. The undersize tailing product is conveyed to the receiving port of the second scraper conveyor through the first bucket elevator after being conveyed by the first drag conveyor.

[0020] Preferably, after the step S8, the following steps are further included:

[0021] S9: A tubular electromagnetic separator is provided for re-magnetic separation of the material in the chute section from the first bucket elevator to the receiving port of the second scraper conveyor for the tailing product obtained in step S8. The magnetic induction intensity is 6500 - 8000 GS. The obtained magnetic materials fall into the lower hopper through the chute and are transferred to the magnetic material storage yard for storage using a forklift.

[0022] Preferably, after the step S9, the following steps are further included:

[0023] A set of dust removal system for tailing loading and sales is provided to control the dust during the process of loading and selling steel slag tailings. The dust raised during the unloading of slag powder during loading and selling is extracted. The dust-containing gas enters the dust collector body through the dust removal pipeline. A bag filter is used to organize the emission of dust during the process of loading and selling tailings. The dust removal air volume of the tailing loading and selling dust removal system is set at 30,000 - 50,000 m³; the collected and filtered dust is continuously discharged from the dust collector to the aggregate third scraper conveyor, and then conveyed to the fine powder bin in the tailing bin storage process through the second bucket elevator.

[0024] Preferably, in the step S3, the following steps are further included:

[0025] A production line environmental dust removal system is set up to collect the dust generated during the operation of the grate cooler. The production line environmental dust removal system adopts a multi-tube ceramic wear-resistant dust collector in series with a bag dust collector, and the dust removal air volume of the production line environmental dust removal system is set at 150,000 - 300,000 m³; for the collected and filtered dust, the dust discharge of the dust collector is connected to the aggregate third scraper conveyor in sequence, and then conveyed to the fine powder bin of the tail slag bin stacking process through the second bucket elevator.

[0026] Compared with the prior art, the present invention has achieved beneficial technical effects:

[0027] The ultra-fast cooling dry process method for stainless steel liquid slag described in the present invention includes the secondary treatment of stainless steel slag. Both the primary treatment and secondary treatment process production lines of stainless steel slag are dry processes for treating stainless steel slag, further reducing the moisture content of the stainless steel slag tail slag product. Due to the low moisture content of the product, it does not need to go through the drying and incineration treatment processes subsequently, with lower usage costs, simpler and faster usage process, more popular in the building materials cement market, and reducing the risk of trivalent chromium converting to hexavalent chromium in high-temperature environments. The entire production process line does not generate industrial production wastewater, and there is no need to set up an industrial wastewater treatment process, thus reducing the construction and operation costs of wastewater treatment facilities and having the advantage of not easily polluting the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic flow chart of an ultra-fast cooling dry process method for stainless steel liquid slag in an embodiment of the present invention;

[0029] Figure 2 is a schematic working flow chart of the production line environmental dust removal system and the tail slag loading and sales dust removal system in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further details the present invention in conjunction with embodiments, but the scope of protection required by the present invention is not limited to the following specific embodiments.

[0031] Refer to Figure 1-2 , an ultra-fast cooling dry process method for stainless steel liquid slag, including the following steps:

[0032] S1: Use a crane to lift the slag ladle filled with stainless steel liquid slag to the working position of the slag tipping machine. The temperature of the stainless steel liquid slag is 1300°C - 1500°C, and the slag tipping machine tilts and dumps the slag ladle onto the working surface of the roller crusher;

[0033] S2: The roller crusher initially crushes and rolls the material obtained in step S1 and pushes it to the receiving port of the grate cooler. Through the pushing of the roller crusher, the temperature of the stainless steel liquid slag is controlled at 1100°C - 1300°C, and the material remains in a liquid state;

[0034] S3: Use the grate cooler to first cool the stainless steel liquid slag at a temperature of 1100°C - 1300°C in S2 and convey it to the next slag cooler for cooling. After the first cooling by the grate cooler, the temperature of the material is 500°C - 700°C, the material is mainly in solid particles, and the particle size of the material is ≤100 mm; the cooling medium used for the stainless steel liquid slag on the grate cooler is compressed air;

[0035] S4: Use the slag cooler to cool the material obtained in step S3 again and convey it to the secondary treatment production line of stainless steel slag. After cooling by the slag cooler, the temperature of the material is 70°C - 120°C, and the particle size of the discharged material is ≤90 mm;

[0036] S5: The secondary treatment line of stainless steel slag receives and processes the material after step S4. The cooled material is conveyed by the first belt conveyor to the receiving point of the first vibrating screen. The aperture of the sieve holes of the first vibrating screen is 5 mm. The oversize material obtained is conveyed by the second belt conveyor to the receiving opening of the rod mill, and the undersize material obtained is conveyed by the third belt conveyor and the fourth belt conveyor to the receiving opening of the first-stage magnetic separator.

[0037] S6: The rod mill grinds the oversize material obtained in step S5 until the particle size of the material is ≤20 mm, and then discharges it through the discharge opening of the rod mill onto the fourth belt conveyor, which conveys it to the receiving point of the first-stage magnetic separator.

[0038] S7: Conduct primary magnetic separation on the undersize material in step S5 and the material ground in step 6. The magnetic induction intensity of the magnetic separation equipment is 5500 - 6500 GS. The magnetic material obtained by magnetic separation is conveyed by the fifth belt conveyor to the magnetic separation powder storage yard for stacking. The remaining non-magnetic material of the magnetic separator is conveyed by the No. 6 belt conveyor to the second vibrating screen.

[0039] S8: Screen the non-magnetic material obtained in step S7. The second vibrating screen screens out the alloy steel blocks that cannot be ground. The diameter of the sieve holes of the second vibrating screen is 5 mm. The particle size of the oversize alloy steel blocks obtained is 5 mm - 20 mm. The alloy steel blocks are conveyed by the No. 7 belt conveyor to the alloy steel block storage yard for stacking. The undersize tail slag product is conveyed by the first submerged scraper conveyor and lifted by the first bucket elevator to the receiving opening of the second submerged scraper conveyor.

[0040] S9: For the chute section from the first bucket elevator to the receiving opening of the second submerged scraper conveyor of the tail slag product obtained in step S8, a tubular iron remover is set to conduct secondary magnetic separation on the material. The magnetic induction intensity is 6500 - 8000 GS. The magnetic material obtained falls through the chute into the lower hopper for loading and is transferred to the magnetic material storage yard for stacking using a forklift.

[0041] Among them, steps S1 - S4 belong to the technological process in the primary treatment line of stainless steel slag, and steps S5 - S9 belong to the technological process in the secondary treatment line of stainless steel slag.

[0042] A production line environmental dust removal system is set up to collect the dust generated during the operation of the grate cooler. The production line environmental dust removal system uses a multi-tube ceramic wear-resistant dust collector in series with a bag filter. The dust removal air volume of the production line environmental dust removal system is set at 150,000 - 300,000 m³. For the collected and filtered dust, the dust discharge of the dust collector is connected to the aggregate third scraper conveyor in sequence, and then transported to the fine powder bin in the tail slag bin stacking process through the second bucket elevator.

[0043] A tail slag loading and sales dust removal system is set up to control the dust during the loading and sales process of steel slag tail slag. When loading and selling, the dust raised by the discharge of slag powder is extracted. The dust-containing gas enters the dust collector body through the dust removal pipeline. A bag filter is used to organize the emission of dust during the tail slag loading and sales process. The dust removal air volume of the tail slag loading and sales dust removal system is set at 30,000 - 50,000 m³. For the collected and filtered dust, the dust discharge of the dust collector is connected to the aggregate third scraper conveyor in sequence, and then transported to the fine powder bin in the tail slag bin stacking process through the second bucket elevator.

[0044] The dust-containing gas of the tail slag material collected by dust extraction in each production process is first preliminarily dust-removed by a multi-tube ceramic cyclone dust collector through the dust removal pipeline. The obtained dust-removal ash material is transported to two fine powder bins in the tail slag bin stacking process through the aggregate scraper conveyor, bucket elevator, and scraper conveyor. The remaining dust-containing gas is sent to the bag filter through the pipeline. The dust-removal ash collected by the bag filter is transported to two fine powder bins in the tail slag bin stacking process through the aggregate scraper conveyor, bucket elevator, and scraper conveyor. After dust removal, the tail gas is discharged into the atmospheric environment through the chimney.

[0045] In step S1, the molten stainless steel liquid slag is contained in the slag ladle used. The slag ladle is lifted by a crane and transported to the tilting machine for tilting. The lifting and tilting process takes 10 - 15 minutes.

[0046] In step S2, the roller crusher reciprocates within the operation area, rolls and pushes the liquid slag to the receiving point of the grate cooler. The operation time of this step is 10 - 15 minutes. A dust suction point of the production line environmental dust removal system is set in the operation area of the roller press.

[0047] In step S3, the cooling medium used for the primary cooling of the grate cooler is compressed air. Compressed air is set for blowing, and a dust suction point of the production line environmental dust removal system is set in the operation area of the grate cooler. This can achieve the effect of blowing and cooling, and also improve the dust collection and powder selection efficiency. The operation time of this step is controlled within 10 - 15 minutes.

[0048] The slag cooler described in step S4 is subjected to secondary cooling. It adopts a water-cooled wall structure, circulates industrial cooling water, and dust extraction points are provided at both the inlet and outlet of the slag cooler. The cooling time of the material in the slag cooler is 10 min - 15 min, the material temperature is 70°C - 120°C, and the particle size of the discharged material is 1 mm - 90 mm.

[0049] Step S5 involves receiving the material after the primary cooling of stainless steel slag. The material temperature is 70°C - 120°C. The vibrating screen has strip-shaped screen holes with a screen hole diameter of 5 mm. The oversize material is conveyed by the third belt conveyor to a rod mill for grinding, and the undersize material is conveyed by the fourth belt conveyor to a primary magnetic separator for magnetic separation.

[0050] Step S6 involves the rod mill processing the oversize material from step S5 above. The discharge port of the rod mill is located on the fourth belt conveyor.

[0051] In step S7 of the primary magnetic separation, the magnetic induction intensity of the magnetic separator is 5500 - 6500 GS. The obtained magnetic material is conveyed by the fifth belt conveyor to the corresponding storage yard for stacking, and the non-magnetic material after the primary magnetic separation is conveyed by the No. 6 belt conveyor to a second vibrating screen for processing.

[0052] The second vibrating screen described in step S8 has a screen hole diameter of 5 mm. Its purpose is to screen out the alloy slag blocks of the non-magnetic material in step S7 above. The oversize material is conveyed by the No. 7 belt conveyor to the corresponding storage yard for stacking, and the undersize material is conveyed by an airtight conveying equipment, a submerged scraper conveyor, to the receiving hopper of an airtight conveying equipment, a first bucket elevator. The first bucket elevator lifts the material to a height higher than the height of the finished stainless steel slag tail slag bin, facilitating the second submerged scraper conveyor to discharge the material into the bin.

[0053] Step S9 uses a chute iron remover for secondary magnetic separation of the material, with a magnetic induction intensity of 6500 - 8000 GS. The magnetic material discharge port of the chute iron remover is composed of a discharge chute pipe, and the material falls by gravity into the lower hopper, and then a forklift is used to transfer the hopper. The obtained non-magnetic material is discharged from the non-magnetic material discharge chute to a second scraper conveyor, and the second scraper conveyor conveys it to the corresponding bin for discharging. The finished tail slag bin adopts a silo with a circular upper part and a conical lower part, and a corresponding lining plate, a PTFE plate, is provided on the inner wall of the bin to prevent the material from getting damp and caking.

[0054] Compared with the prior art, the present invention has achieved beneficial technical effects:

[0055] The present invention does not require water spraying for cooling in the first treatment and the second treatment of stainless steel slag, thus effectively reducing the water content in the slag. In the first treatment of stainless steel slag, the cooling method is more efficient and environmentally friendly. The grate cooler and the slag cooler are used in combination to cool the high-temperature liquid stainless steel slag, and the temperature of the cooled material is within the processing range of the second treatment line of stainless steel slag.

[0056] The ultra-fast cooling dry treatment process method for stainless steel liquid slag described in the present invention includes the second treatment of stainless steel slag. No industrial production wastewater is generated in the entire production process line, and there is no need to set up an industrial wastewater treatment process. Therefore, the construction and operation costs of wastewater treatment facilities are reduced, and it has the advantage of not easily polluting the surrounding environment.

[0057] Both the first treatment and the second treatment process production lines of stainless steel slag are dry treatment of stainless steel slag, further reducing the water content of the stainless steel slag tail slag product. Due to its low water content, the product does not need to go through drying and incineration treatment processes subsequently, has lower usage costs, is simpler and faster in the usage process, is more popular in the building materials and cement market, and reduces the risk of trivalent chromium converting to hexavalent chromium in high-temperature environments.

[0058] The magnetic induction intensities of the first-stage magnetic separation and the second-stage magnetic separation are 5500 - 6500 GS and 6500 - 8000 GS respectively. The first-stage magnetic separation uses a relatively weak magnetic induction intensity, so that alloy steel blocks can be retained in the slag after the first-stage magnetic separation, enabling the second vibrating screen to screen out alloy steel block products and improving the utilization efficiency of stainless steel slag. The second-stage magnetic separation uses a relatively strong magnetic induction intensity to ensure the screening efficiency, avoid too high iron content in the stainless steel slag tail slag after the second-stage magnetic separation, and also improve the utilization rate of stainless steel slag.

[0059] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the invention.

Claims

1. A dry processing method for ultra-fast cooling of stainless steel liquid slag, characterized in that, It includes the following steps: S1: Use a traveling crane to lift the slag ladle filled with stainless steel liquid slag to the working position of the slag tilter. The temperature of the stainless steel liquid slag is 1300°C - 1500°C. The slag tilter tilts the slag ladle to pour the slag onto the working surface of the roller crusher; S2: The roller crusher initially crushes and rolls the material obtained in step S1 and pushes it to the receiving opening of the grate cooler. Through the pushing of the roller crusher, the temperature of the stainless steel liquid slag is controlled at 1100°C - 1300°C, and the material remains in a liquid state; S3: Use the grate cooler to cool the stainless steel liquid slag at 1100°C - 1300°C in step S2 for the first time and transport it to the next cooler for further cooling. After the first cooling by the grate cooler, the temperature of the material is 500°C - 700°C, and the material mainly presents as solid particles with a particle size ≤ 100mm. The cooling medium used for the stainless steel liquid slag on the grate cooler is compressed air; S4: Use the cooler to cool the material obtained in step S3 again and transport it to the secondary stainless steel slag treatment production line. After cooling by the cooler, the temperature of the material is 70°C - 120°C, and the particle size of the discharged material ≤ 90mm.

2. The ultra-rapid cooling dry process method for stainless steel liquid slag according to claim 1, characterized in that, After the said step S4, it further includes the following steps: S5: The secondary stainless steel slag treatment line receives and processes the material after step S4. The cooled material is conveyed by the first belt conveyor to the receiving point of the first vibrating screen. The aperture of the sieve holes of the first vibrating screen is 5mm. The oversize material obtained is conveyed by the second belt conveyor to the receiving opening of the rod mill, and the undersize material obtained is conveyed by the third belt conveyor and the fourth belt conveyor to the receiving opening of the first-stage magnetic separator.

3. The ultra-fast cooling dry treatment process method for stainless steel liquid slag according to claim 2, characterized in that, After the said step S5, it further includes the following steps: S6: The rod mill grinds the oversize material obtained in step S5 until the particle size of the material ≤ 20mm, and then discharges it from the discharge opening of the rod mill onto the fourth belt conveyor, which conveys it to the receiving point of the first-stage magnetic separator.

4. The ultra-rapid cooling dry treatment process method for stainless steel liquid slag according to claim 3, characterized in that After the said step S5, it further includes the following steps: S7: Conduct primary magnetic separation on the undersize material in step S5 and the material after grinding in step 6. The magnetic induction intensity of the magnetic separation equipment is 5500 - 6500GS. The magnetic material obtained by magnetic separation is conveyed by the fifth belt conveyor to the magnetic separation powder storage yard for stacking. The remaining non-magnetic material of the magnetic separator is conveyed by the No. 6 belt conveyor to the second vibrating screen.

5. The ultra-rapid cooling dry process method for stainless steel liquid slag according to claim 4, characterized in that, After the said step S5, it further includes the following steps: S8: Screen the non-magnetic material obtained in step S7. The second vibrating screen screens out the alloy steel blocks that cannot be ground. The aperture of the sieve holes of the second vibrating screen is 5mm. The particle size of the oversize alloy steel blocks obtained is 5mm - 20mm. The alloy steel blocks are conveyed by the No. 7 belt conveyor to the alloy steel block storage yard for stacking. The undersize tailing slag product is conveyed by the first scraper conveyor and lifted by the first bucket elevator to the receiving opening of the second scraper conveyor.

6. The ultra-fast cooling dry treatment process method for stainless steel liquid slag according to claim 5, characterized in that, After the said step S8, it further includes the following steps: S9: A tubular electromagnetic separator is installed in the chute section from the first bucket elevator to the receiving opening of the second scraper conveyor for the tailing slag product obtained in step S8 to conduct secondary magnetic separation on the material. The magnetic induction intensity is 6500 - 8000GS. The magnetic material obtained falls through the chute into the lower hopper for loading and is transferred to the magnetic material storage yard for stacking using a forklift.

7. The method for dry treatment of ultrafast cooling of stainless steel liquid slag according to claim 6, characterized in that, After the step S9, the following steps are further included: A set of dust removal system for loading and selling tail slag is provided, which is used for dust control during the process of loading and selling steel slag tail slag. During loading and selling, the dust raised by the discharge of slag powder is extracted, and the dust-containing gas enters the dust collector body through the dust removal pipeline. A bag filter is used to organize the emission of dust during the process of loading and selling tail slag. The dust removal air volume of the dust removal system for loading and selling tail slag is set at 30,000 - 50,000 m³; the collected and filtered dust is continuously discharged from the dust collector to the aggregate third scraper conveyor, and then conveyed to the fine powder bin in the tail slag bin stacking process through the second bucket elevator.

8. The ultra-fast cooling dry process method for stainless steel liquid slag according to claim 1, characterized in that, In the step S3, the following steps are further included: A set of production line environmental dust removal system is provided for collecting the dust generated during the operation of the grate cooler. The production line environmental dust removal system uses a multi-tube ceramic wear-resistant dust collector in series with a bag filter. The dust removal air volume of the production line environmental dust removal system is set at 150,000 - 300,000 m³; the collected and filtered dust is continuously discharged from the dust collector to the aggregate third scraper conveyor, and then conveyed to the fine powder bin in the tail slag bin stacking process through the second bucket elevator.

Images