CN116003107A - Method and equipment for reducing electric smelting magnesia particles of regenerated magnesia carbon bricks - Google Patents
Method and equipment for reducing electric smelting magnesia particles of regenerated magnesia carbon bricks Download PDFInfo
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- CN116003107A CN116003107A CN202211684102.0A CN202211684102A CN116003107A CN 116003107 A CN116003107 A CN 116003107A CN 202211684102 A CN202211684102 A CN 202211684102A CN 116003107 A CN116003107 A CN 116003107A
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Abstract
The invention provides a method and equipment for reducing fused magnesia particles of a regenerated magnesia carbon brick, wherein the reduction method comprises the following steps: s1, primary selection and carefully selecting of waste magnesia carbon bricks, framing the sorted waste magnesia carbon bricks, performing digestion treatment, and then performing drying treatment; s2, crushing the treated waste magnesia carbon bricks into 15-0 mm magnesia carbon brick particles; s3, performing oxidation decarburization treatment on magnesia carbon brick particles placed in the rotary kiln cylinder body through a temperature control system and an oxygen supply system; s4, discharging magnesia carbon brick particles subjected to oxidation and decarbonization treatment, cooling to a temperature of less than 40 ℃, and screening to obtain magnesia finished products with different specifications. The inner diameter d of the stainless steel cylinder in the reduction equipment is 0.2-0.5 m. The sintering temperature adopted by the invention is controlled to be 800-1100 ℃ which is lower than the existing 1250-1350 ℃, thus reducing the energy consumption; meanwhile, the inner diameter of the stainless steel cylinder body is small.
Description
Technical Field
The invention belongs to the technical field of reuse of smelting wastes, and particularly relates to an electric smelting magnesia particle reduction method and equipment for regenerated magnesia carbon bricks.
Background
Along with the mature and rapid development of the recycling technology of the regenerated magnesia carbon bricks, the regenerated magnesia carbon bricks treated by the existing crushing processing shaping technology still have certain pseudo-particle phenomenon, and the later addition amount and the product usability are affected. On one hand, no special decarburization equipment is adopted, the existing rotary kiln is high in energy consumption, on the other hand, a certain residual carbon still exists in the burnt magnesia carbon bricks, and the particles and subdivision have a certain sintering agglomeration problem, so that the later use is inconvenient, and the particle sintering reduction technology of the waste magnesia carbon bricks has not reached industrial application. How to fully and effectively reduce the fused magnesia in the magnesia carbon brick is still a key technology to be solved at present.
The Chinese patent application No. 202111493860X discloses a method for reutilizing waste magnesia carbon bricks, which comprises the following steps: removing the steel facing surface of the waste magnesia carbon bricks; crushing waste magnesia carbon bricks into particles with the specification of 0-5mm, and removing iron; soaking the crushed grains in water for 24-48 hours; adding alcohol compound, mixing and grinding for 15-30 minutes, and trapping for more than 1 hour; oxidizing the waste magnesia carbon bricks subjected to the ageing treatment in an oxygen atmosphere at 1250-1350 ℃ for 50-90 minutes. However, on one hand, the temperature of the method is controlled to 1250-1350 ℃, a large amount of energy is consumed, the current fuel gas cost is high, the heat loss of combustion is also high, and the method is not beneficial to environmental protection; on the other hand, the waste magnesia carbon bricks are crushed into particles with the specification of 0-5mm, and the particle size range is smaller. Moreover, the rotary kiln equipment adopted by the method is large, and the equipment is required to have a very sufficient amount of waste magnesia carbon bricks to meet continuous production. Finally, waste magnesia carbon bricks with the granularity of 5-0 mm cannot be fully exerted in a rotary kiln with the inner diameter of 2 meters or more, and are sintered and oxidized, so that great heat energy is wasted again, and in order to ensure the reduction of magnesia of the waste magnesia carbon bricks, the sintering temperature can only be increased at one time, and the great heat energy is wasted again.
Disclosure of Invention
The invention aims to provide an electric smelting magnesia particle reduction method and equipment for regenerated magnesia carbon bricks, which solve the problems that the existing method has high combustion heat loss caused by overhigh temperature, waste magnesia carbon bricks are broken into smaller specification ranges, the cost is increased, continuous production cannot be met caused by overlarge rotary kiln equipment, and the like, thereby reducing the combustion heat loss and improving the oxidation reduction effect.
In order to achieve the aim, the invention discloses a method for reducing fused magnesia particles of a regenerated magnesia carbon brick, which comprises the following steps:
s1, primary selection and carefully selecting of waste magnesia carbon bricks, framing the sorted waste magnesia carbon bricks, performing digestion treatment, and then performing drying treatment;
s2, crushing the treated waste magnesia carbon bricks into 15-0 mm magnesia carbon brick particles;
s3, performing oxidation decarburization treatment on magnesia carbon brick particles placed in the rotary kiln cylinder body through a temperature control system and an oxygen supply system;
s4, discharging magnesia carbon brick particles subjected to oxidation and decarbonization treatment, cooling to a temperature of less than 40 ℃, and screening to obtain magnesia finished products with different specifications.
Further, the step S1 includes the steps of:
s11, removing other sundries except magnesia carbon bricks;
s12, selecting, namely manually beating and removing impurities such as steel slag, iron, metamorphic layer, attached fire mud floating ash and the like of the waste magnesia carbon bricks subjected to primary selection;
s13, framing the carefully selected waste magnesia carbon bricks for digestion treatment;
s14, drying the waste magnesia carbon bricks subjected to the digestion treatment in the air, and then thermally drying the waste magnesia carbon bricks for 6 to 10 hours at the temperature of 200 to 250 ℃.
Further, the step S3 includes the steps of:
s31, controlling the heating temperature inside the rotary kiln cylinder body to be 800-1100 ℃ through the temperature control system;
s32, throwing the magnesia carbon brick particles from a feed inlet of the rotary kiln, so that the magnesia carbon brick particles slowly descend while transversely rolling;
s33, simultaneously ensuring 1t of magnesium carbon per processingBrick particles, and the oxygen supply system is supplied with 150-300 m 3 The oxygen is slowly added from a discharge hole of the rotary kiln, so that the oxygen is oxidized and decarbonized after encountering magnesia carbon brick particles in the rising process.
Further, in the step S3, the rotation speed of the rotary kiln is 15-30 r/min.
Further, in the step S4, the equipment used for screening is a vibrating screen, and the specification of the magnesia finished product material screened by the vibrating screen comprises four fractions of 5-3 mm, 3-1 mm, 1-0.5 mm and less than 0.5 mm.
The invention also provides electric smelting magnesia particle reduction equipment of the regenerated magnesia carbon brick specially designed for realizing the method, which comprises a rotary kiln with a microstructure, wherein the rotary kiln comprises an inner heat-resistant stainless steel cylinder, an outer heat-insulating layer and a heating layer positioned between the inner heat-resistant stainless steel cylinder and the outer heat-insulating layer, the inner diameter d of the stainless steel cylinder is 0.2-0.5 m, and the length of the rotary kiln is 2-5 m.
Further, the inclination angle of the rotary kiln and the ground is 3-5 degrees.
Further, the heating layer is composed of a resistance wire heating net, and the temperature of the resistance wire heating net is controlled to be 800-1100 ℃ through a temperature control system.
Further, the heat preservation layer is made of fiber cotton, and the thickness of the heat preservation layer is 10-20 cm.
Further, the discharging end of the rotary kiln is provided with an oxygen supply system, the oxygen supply system comprises an oxygen tank and an oxygen pipe connected to the discharging end, and the supplementary amount of oxygen is 150-300 m for feeding 1t magnesia carbon brick particles per processing 3 。
Compared with the prior art, the invention has the beneficial effects that:
1. the sintering temperature in the reduction method adopted by the invention is controlled to be 800-1100 ℃, which is lower than the existing 1250-1350 ℃, the heat energy consumption is lower, and the use of energy consumption is reduced;
2. according to the reduction method, the magnesia carbon brick particles with the particle diameter of 15-0 mm are crushed, and compared with the particle diameter range of 0-5mm in the prior art, the particle diameter range of the magnesia carbon brick particles is enlarged, so that the crushing input cost is effectively reduced;
3. in the reduction method adopted by the invention, proper oxygen supplementation is carried out at the discharge port of the rotary kiln, so that the decarburization effect is good, and the quality of the finally obtained magnesia finished product is good;
4. the rotary kiln with the microstructure adopted by the invention has small diameter, short length, small occupied area and less equipment investment, is suitable for intermittently treating magnesia carbon bricks, and can meet the requirement of continuous production of waste magnesia carbon bricks.
5. The rotary oxygen-feeding medium-temperature sintering equipment of the miniature rotary kiln is particularly suitable for small-batch low-energy-consumption production, carbon in the regenerated magnesia carbon brick particles can be fully burnt, the subdivision level difference among the particles is ensured, and the reduced fused magnesia particles can be directly and equivalently used in magnesia carbon brick products.
6. Through preliminary estimation, if 5500 tons of recycled magnesia carbon bricks can be recycled each year by a certain refractory material company, the fused magnesia particles reduced by the technical scheme of the invention can reach more than 3000 tons, and can be directly used for replacing fused magnesia, so that the cost is expected to be saved by 3000 x 1500=450 ten thousand yuan; the invention has good industrialized popularization value because 150 ten thousand tons of regenerated magnesia carbon bricks need to be processed every year.
Drawings
FIG. 1 is a schematic diagram of a rotary kiln and an oxygen supply system according to the present invention;
fig. 2 is a schematic cross-sectional view of the rotary kiln of the present invention.
In the figure: the rotary kiln comprises a rotary kiln 1, a feeding end 11, a discharging end 12, a heat preservation layer 13, a heating layer 14 and a heat-resistant stainless steel cylinder 15; an oxygen tank 2 and an oxygen tube 21.
Detailed Description
For a better explanation of the present invention, the main content of the present invention is further elucidated below in conjunction with the specific examples, but the content of the present invention is not limited to the following examples only.
The embodiment discloses an electric smelting magnesia particle reduction method for regenerated magnesia carbon bricks, which comprises the following steps:
s1, primary selection and carefully selecting of waste magnesia carbon bricks, framing the sorted waste magnesia carbon bricks, performing digestion treatment, and then performing drying treatment;
s2, crushing the treated waste magnesia carbon bricks into 15-0 mm magnesia carbon brick particles;
s3, performing oxidation decarburization treatment on magnesia carbon brick particles placed in the rotary kiln cylinder body through a temperature control system and an oxygen supply system;
s4, discharging magnesia carbon brick particles subjected to oxidation and decarbonization treatment, cooling to a temperature of less than 40 ℃, and screening to obtain magnesia finished products with different specifications.
According to the reduction method, the magnesia carbon brick particles which are crushed into 15-0 mm are adopted, and compared with the particle size range of 0-5mm in the prior art, the particle size range of the magnesia carbon brick particles is enlarged.
In this embodiment, S1 includes the following steps:
s11, primarily selecting comprises removing other sundries except magnesia carbon bricks;
s12, carefully selecting the waste magnesia carbon bricks, namely manually beating and removing impurities such as steel slag, iron, metamorphic layers, attached fire mud floating ash and the like of the primarily selected waste magnesia carbon bricks;
s13, framing the carefully selected waste magnesia carbon bricks for digestion treatment;
s14, drying the digested waste magnesia carbon bricks in the air, and thermally drying the waste magnesia carbon bricks at the temperature of 200-250 ℃ for 6-10 hours.
In this embodiment, S3 includes the following steps:
s31, controlling the heating temperature in the rotary kiln cylinder body to be 800-1100 ℃ through a temperature control system;
s32, throwing magnesia carbon brick particles from a feed inlet of the rotary kiln, so that the magnesia carbon brick particles slowly descend while transversely rolling;
s33, simultaneously ensuring that 1t of magnesia carbon brick particles are processed, and supplying 150-300 m to an oxygen system 3 Oxygen is slowly added from a discharge hole of the rotary kiln, so that oxidation decarburization occurs after the oxygen meets magnesia carbon brick particles in the rising process.
In this embodiment, in step S3, the rotation speed of the rotary kiln 1 is 15-30 r/min. After the regenerated magnesia carbon brick particles enter the cylinder from the feed inlet 11, the magnesia carbon brick particles quickly roll transversely and slowly downwards, in the process, the magnesia carbon brick particles are heated and rise in temperature and begin to oxidize and decarbonize from outside to inside, the formed surface decarbonizing layer is broken and separated under the action of the quick rolling of the particles, further decarbonizing is promoted, and finally, the decarbonized magnesia carbon particles are discharged from the discharge outlet 12.
In this embodiment, in the step S4, the equipment used for screening is a vibrating screen, and the specifications of the finished magnesia material screened by the vibrating screen include four fractions of 5-3 mm, 3-1 mm, 1-0.5 mm and less than 0.5 mm. Wherein, the particles with the particle size of 5-3 mm, 3-1 mm and 1-0.5 mm can be directly used for replacing magnesia raw materials to be equivalently used in products, and the powder with the particle size of less than 0.5mm can be used for replacing or downshifting in secondary products with a small amount of equivalent.
As shown in fig. 1-2, this embodiment also discloses an electric fused magnesia particle reduction device for realizing the regenerated magnesia carbon brick specifically designed by the method, which comprises a micro-structured rotary kiln 1, wherein the rotary kiln 1 comprises an inner heat-resistant stainless steel cylinder 15, an outer heat-insulating layer 13 and a heating layer 14 positioned between the inner heat-resistant stainless steel cylinder 15 and the outer heat-insulating layer, the inner diameter d of the stainless steel cylinder 15 is 0.2-0.5 m, and the length of the rotary kiln 1 is 2-5 m. Compared with the inner diameter of the large rotary kiln 2m, the inner diameter of the rotary kiln is greatly reduced, the occupied area is small, the equipment investment is low, and the rotary kiln is suitable for intermittent treatment of magnesia carbon bricks.
In this embodiment, the inclination angle of the rotary kiln 1 with respect to the ground is 3 to 5 °. And an inclined angle with a certain angle is arranged, so that magnesia carbon brick particles can roll downwards at a proper speed.
In this embodiment, the heating layer 14 is formed of a resistance wire heating mesh, and the temperature of the resistance wire heating mesh is controlled to 800-1100 ℃ by a temperature control system. The sintering temperature in the reduction method adopted by the invention is controlled to be 800-1100 ℃, which is lower than the existing 1250-1350 ℃, the heat energy consumption is lower, and the use of energy consumption is reduced. At this temperature, graphite in the magnesia carbon bricks can be oxidized rapidly, meanwhile, magnesia is not sintered basically at this temperature, the intensity of the magnesia carbon bricks after decarburization is the lowest, and separation can occur between particles and fine powder under rolling collision.
In this embodiment, the heat-insulating layer 13 is made of fiber cotton, and has a thickness of 10-20 cm. Can effectively play a role in heat preservation.
In the embodiment, the discharge end 12 of the rotary kiln is provided with an oxygen supply system, the oxygen supply system comprises an oxygen tank 2 and an oxygen pipe 21 connected to the discharge end 12, and the supplementing amount of oxygen is 150-300 m for feeding 1t of magnesia carbon brick particles per processing 3 . Oxygen is slowly added from a discharge hole, and oxidation and decarburization are carried out when magnesia carbon brick particles are encountered in the rising process, on one hand, oxygen is supplemented to be beneficial to further decarburization and oxidation of magnesia carbon bricks, and finally, the obtained magnesia finished product material has good quality; on the other hand, the energy consumption is further saved by reducing the heat taken away by the gas to the oxygen.
The equipment adopts the electric energy heating and heat preservation technology, the firing temperature is controlled lower, oxygen is supplemented, the generated gas is less, and the heat energy consumption is lower. The consumption of heat energy is 200-300 yuan/t, the consumption of oxygen is 150-300 yuan/t, and the total cost is controlled to be 350-600 yuan/t, so that the method is more in line with the low-carbon environment-friendly emission reduction requirement compared with the existing 1000 yuan/t.
In the embodiment, the equipment used for screening is a vibrating screen, and the specifications of the magnesia finished product materials screened by the vibrating screen comprise 5-3 mm, 3-1 mm, 1-0.5 mm and less than 0.5 mm. The final effects of the present invention will be described by three specific examples.
Example 1
The total length of the rotary kiln 1 is 5m, the inner diameter d of the stainless steel cylinder 15 is 0.5m, the inclination angle between the rotary kiln 1 and the ground is 5 degrees, the rotation speed of the rotary kiln 1 is 30r/min, the heating temperature of the resistance wire heating net is controlled at 1000 ℃, and the oxygen supplementing amount is 300m 3 The processing amount of the magnesia carbon brick particles can reach 3 t/hour. The compound content of the finally produced magnesite finished products of different specifications is shown in table 1.
TABLE 1
The electric smelting magnesia with 5-3 mm, 3-1 mm and 1-0.5 mm standard material is directly used on magnesia carbon bricks of the converter body, and the powder with less than or equal to 0.5mm is directly used on magnesia carbon bricks of the converter cap.
Example 2
The total length of the rotary kiln 1 is 4m, the inner diameter d of the stainless steel cylinder 15 is 0.4m, the inclination angle between the rotary kiln 1 and the ground is 4 degrees, the rotation speed of the rotary kiln 1 is 25r/min, the heating temperature of the resistance wire heating net is controlled at 900 ℃, and the oxygen supplementing amount is 200m 3 The processing amount of the magnesia carbon brick particles can reach 2.5 t/hour. The compound content of the finally produced magnesite finished products of different specifications is shown in table 2.
TABLE 2
The electric smelting magnesia is 5-3 mm, 3-1 mm, 1-0.5 mm standard material is directly used on magnesia carbon bricks of ladle slag lines, and powder with the thickness less than or equal to 0.5mm is directly used on magnesia carbon bricks of ladle edges.
Example 3
The total length of the rotary kiln 1 is 2m, the inner diameter d of the stainless steel cylinder 15 is 0.2m, the inclination angle between the rotary kiln 1 and the ground is 3 degrees, the rotation speed of the rotary kiln 1 is 15r/min, the heating temperature of the resistance wire heating net is controlled at 800 ℃, and the oxygen supplementing amount is 150m 3 The processing amount of the/t magnesia carbon brick particles can reach 1 t/hour. The compound content of the finally produced magnesite finished products of different specifications is shown in table 3.
TABLE 3 Table 3
The electric smelting magnesia with 5-3 mm, 3-1 mm and 1-0.5 mm standard material is used directly in ladle magnesia alumina carbon brick and the powder material with less than or equal to 0.5mm is used directly in magnesia paint and magnesia large fabric.
The rotary oxygen-feeding medium-temperature sintering equipment of the miniature rotary kiln is particularly suitable for small-batch low-energy-consumption production, carbon in the regenerated magnesia carbon brick particles can be fully burnt, the subdivision level difference among the particles is ensured, and the reduced fused magnesia particles can be directly and equivalently used in magnesia carbon brick products.
Through preliminary estimation, if 5500 tons of recycled magnesia carbon bricks can be recycled each year by a certain refractory material company, the fused magnesia particles reduced by the technical scheme of the invention can reach more than 3000 tons, and can be directly used for replacing fused magnesia, so that the cost is expected to be saved by 3000 x 1500=450 ten thousand yuan; the invention has good industrialized popularization value because 150 ten thousand tons of regenerated magnesia carbon bricks need to be processed every year.
Claims (10)
1. The method for reducing the fused magnesia particles of the regenerated magnesia carbon brick is characterized by comprising the following steps of:
s1, primary selection and carefully selecting of waste magnesia carbon bricks, framing the sorted waste magnesia carbon bricks, performing digestion treatment, and then performing drying treatment;
s2, crushing the treated waste magnesia carbon bricks into 15-0 mm magnesia carbon brick particles;
s3, performing oxidation decarburization treatment on magnesia carbon brick particles placed in the rotary kiln cylinder body through a temperature control system and an oxygen supply system;
s4, discharging magnesia carbon brick particles subjected to oxidation and decarbonization treatment, cooling to a temperature of less than 40 ℃, and screening to obtain magnesia finished products with different specifications.
2. The method for reducing fused magnesia particles of a recycled magnesia carbon brick according to claim 1, wherein S1 comprises the steps of:
s11, removing other sundries except magnesia carbon bricks;
s12, selecting, namely manually beating and removing impurities such as steel slag, iron, metamorphic layer, attached fire mud floating ash and the like of the waste magnesia carbon bricks subjected to primary selection;
s13, framing the carefully selected waste magnesia carbon bricks for digestion treatment;
s14, drying the waste magnesia carbon bricks subjected to the digestion treatment in the air, and then thermally drying the waste magnesia carbon bricks for 6 to 10 hours at the temperature of 200 to 250 ℃.
3. The method for reducing fused magnesia particles of a recycled magnesia carbon brick according to claim 1, wherein S3 comprises the steps of:
s31, controlling the heating temperature inside the rotary kiln cylinder body to be 800-1100 ℃ through the temperature control system;
s32, throwing the magnesia carbon brick particles from a feed inlet of the rotary kiln, so that the magnesia carbon brick particles slowly descend while transversely rolling;
s33, simultaneously ensuring that 1t of magnesia carbon brick particles are processed, and supplying 150-300 m to an oxygen system 3 The oxygen is slowly added from a discharge hole of the rotary kiln, so that the oxygen is oxidized and decarbonized after encountering magnesia carbon brick particles in the rising process.
4. The method for reducing the fused magnesia particles of the regenerated magnesia carbon brick according to claim 1, wherein the method comprises the following steps: in the step S3, the rotation speed of the rotary kiln is 15-30 r/min.
5. The method for reducing the fused magnesia particles of the regenerated magnesia carbon brick according to claim 1, wherein the method comprises the following steps: in the step S4, the equipment adopted in the screening is a vibrating screen, and the specification of the magnesia finished product material screened by the vibrating screen comprises four fractions of 5-3 mm, 3-1 mm, 1-0.5 mm and less than 0.5 mm.
6. An electric fused magnesia particle reduction apparatus for regenerating magnesia carbon bricks specifically designed for implementing the method of claim 1, comprising a micro-structured rotary kiln (1), characterized in that:
the rotary kiln (1) comprises an inner heat-resistant stainless steel cylinder (15), an outer heat-insulating layer (13) and a heating layer (14) positioned between the inner heat-resistant stainless steel cylinder and the outer heat-insulating layer, wherein the inner diameter d of the stainless steel cylinder (15) is 0.2-0.5 m, and the length of the rotary kiln (1) is 2-5 m.
7. The fused magnesia grain reduction equipment for regenerating magnesia carbon bricks according to claim 6, wherein: the inclination angle of the rotary kiln (1) and the ground is 3-5 degrees.
8. The fused magnesia grain reduction equipment for regenerating magnesia carbon bricks according to claim 6, wherein: the heating layer (14) is composed of a resistance wire heating net, and the temperature of the resistance wire heating net is controlled to be 800-1100 ℃ through a temperature control system.
9. The fused magnesia grain reduction equipment for regenerating magnesia carbon bricks according to claim 6, wherein: the heat preservation layer (13) is made of fiber cotton, and the thickness of the heat preservation layer is 10-20 cm.
10. The fused magnesia grain reduction equipment for regenerating magnesia carbon bricks according to claim 6, wherein: the discharging end (12) of the rotary kiln is provided with an oxygen supply system, the oxygen supply system comprises an oxygen tank (2) and an oxygen pipe (21) connected to the discharging end (12), and the supplementing amount of oxygen is 150-300 m for feeding 1t magnesia carbon brick particles per processing 3 。
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| CN114163218A (en) * | 2021-12-08 | 2022-03-11 | 攀枝花钢城集团有限公司 | Method for recycling waste magnesia carbon bricks |
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2022
- 2022-12-27 CN CN202211684102.0A patent/CN116003107A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2867240Y (en) * | 2006-01-26 | 2007-02-07 | 卞武扬 | High-temperature indirect heating rotary resistor furnace |
| US20150013498A1 (en) * | 2012-02-10 | 2015-01-15 | Telsugen Corporation | Method of production and apparatus for production of reduced iron |
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