CN118147387A - Method for cooling KR desulfurized molten iron by utilizing limestone - Google Patents
Method for cooling KR desulfurized molten iron by utilizing limestone Download PDFInfo
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- CN118147387A CN118147387A CN202410280726.9A CN202410280726A CN118147387A CN 118147387 A CN118147387 A CN 118147387A CN 202410280726 A CN202410280726 A CN 202410280726A CN 118147387 A CN118147387 A CN 118147387A
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- molten iron
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- stirring
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 269
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 134
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 46
- 239000006028 limestone Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 title claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 76
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 26
- 230000023556 desulfurization Effects 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- 238000003723 Smelting Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 10
- 239000000428 dust Substances 0.000 description 10
- 229910052717 sulfur Inorganic materials 0.000 description 10
- 239000011593 sulfur Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 229910000805 Pig iron Inorganic materials 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000003009 desulfurizing effect Effects 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The application relates to the technical field of ferrous metallurgy, in particular to a method for reducing temperature of KR desulfurized molten iron by utilizing limestone, which comprises the following steps: conveying limestone to a KR desulfurization station ejection bin for standby; determining a feeding stirring model according to the molten iron arrival temperature and the molten iron preset temperature; lowering the stirring paddle, and adding limestone in the rotation process of the stirring paddle; after stirring, measuring the temperature of molten iron, and outputting the temperature reaching a preset range. According to the application, the limestone is selected as the material for cooling the molten iron in the KR desulfurization process in comprehensive consideration of the aspects of material transportation, cooling effect, use cost, stirring paddle service life and the like, so that the cooling work of high-temperature molten iron can be well completed, the molten iron entering the furnace is ensured to meet the requirements of the converter smelting process, and good conditions are created for converter smelting.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for reducing temperature of KR desulfurized molten iron by utilizing limestone.
Background
The temperature of molten iron is a main source of heat income of a converter, and is directly related to the smelting operation control of the converter, and the excessive low temperature of molten iron causes difficult early slag melting and easily causes higher terminal phosphorus or grid discharge, secondary supplementary blowing treatment is needed, the production rhythm is influenced, the terminal molten steel is over-oxidized, and the alloy consumption is increased; excessive molten iron temperature, fast temperature rise in the early stage, advanced carbon-oxygen reaction, increased control difficulty of splashing, increased loss of steel materials, and environmental pollution such as yellow smoke emission and equipment burning damage caused by splashing with iron.
The KR mechanical stirring method is to immerse a stirrer formed by pouring refractory materials into molten iron to rotate at a certain depth, and to put a certain amount of desulfurizing agent when the molten iron forms a vortex, and to finish desulfurization when the desulfurizing agent finishes the desulfurization reaction and floats to the surface of the molten iron to form scum. The KR method has the characteristics of good desulfurization dynamic conditions, high and stable desulfurization efficiency, low consumption of desulfurizing agent, low desulfurization cost and the like, and is widely applied to various large steel plants. With the enlargement of the blast furnace, the smelting control level of the blast furnace is continuously improved, and the molten iron components more meet the steelmaking requirement. When the sulfur of the molten iron meets the requirement but the temperature of the molten iron exceeds the standard, the use of the desulfurizing agent for cooling operation can cause the increase of smelting cost.
The prior KR desulphurized molten iron cooling technology mainly comprises the following modes:
1. Pig iron blocks are added into a hot-metal ladle for cooling operation, as disclosed in Chinese patent document CN 103898267A (application number 201410131381.7), and the KR desulfurized molten iron cooling method using the pig iron blocks uses an electromagnetic chuck to suck up the pig iron blocks, then the pig iron blocks are added into the hot-metal ladle, and the added pig iron blocks are stirred and melted by a stirring paddle. The method needs equipment such as travelling crane, electromagnetic chuck and the like, and the equipment investment cost is high; when a large number of iron blocks fall into the hot-metal ladle, the risk of molten iron splashing exists; because the iron plate hardness is big, when using the stirring rake stirring not melt the iron plate, can cause great damage to the stirring rake body, influence the life of stirring rake.
2. The novel KR molten iron desulfurization cooling process is characterized in that iron ores such as pellets and sinter are used for cooling, as disclosed in Chinese patent document CN 102643954A (application number 201210110975.0), sintered ore powder with the granularity within 3mm is used, high-pressure nitrogen is used for conveying, and a desulfurizing agent on the molten iron surface is involved in the molten iron through rotary stirring of a stirrer and reacts with the molten iron to play a role in cooling. According to the method, a special tank truck is required to be used for transportation, nitrogen is required to be used for feeding and discharging, and the energy medium consumption is increased; the sintered mineral powder with the granularity within 3mm has the possibility that part of powder surface is sucked away by a dust removing fan, and the recovery rate of the mineral powder is affected. The sintered ore (or pellet ore) has high iron content and high hardness, and has serious impact abrasion to the stirring paddle, and greatly influences the service life of the stirring paddle.
3. The converter dust is used for cooling the molten iron, as disclosed in Chinese patent document CN 103710487A (application number 201410012305.4), a method for cooling the molten iron by using the converter dust is used for transporting the dust by using a special suction and discharge vehicle, and the dust is pumped into a storage bin by using high-pressure nitrogen during feeding, so that the energy consumption is additionally increased; because the particle size of the dedusting ash is finer, more dedusting ash is sucked away by a dedusting fan in the blanking process, the actual recovery rate is very low, and the cooling effect is poor.
The method is a subject to be researched and solved at present, and aims to ensure proper molten iron temperature entering into the converter to the greatest extent, stabilize the operation process requirements of the converter and ensure that various indexes of steelmaking processes are steadily forward.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for reducing the temperature of KR desulfurized molten iron by utilizing limestone, which can effectively reduce the temperature of the molten iron in the KR process, does not influence the service life of a stirring paddle, has obvious price advantage compared with other conventional common materials, and is convenient for large-scale production and use.
In order to achieve the technical effects, the invention adopts the following technical scheme:
A method for reducing temperature of KR desulfurized molten iron by utilizing limestone comprises the following steps:
s1, conveying limestone to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the incoming temperature of molten iron and a temperature preset range;
s3, lowering the stirring paddle, and adding limestone in the rotation process of the stirring paddle;
s4, measuring the temperature of molten iron after stirring is finished, and when the temperature reaches a preset range, discharging, and when the temperature does not reach the preset range, repeating the step S2 and the step S3 until the temperature reaches the preset range;
The charging and stirring model is as follows:
preferably, in step S1, the limestone has a particle size ranging from 10mm to 40mm and a moisture content of < 0.5%.
Preferably, in step S2, the sulfur content range in the molten iron meets the grade requirement, and the following is specific: the sulfur content of HRB400E/HRB500E series molten iron is less than or equal to 0.035%; the sulfur content of the Q235B/Q335B series molten iron is less than or equal to 0.030 percent.
Preferably, in step S2, the preset range of the molten iron temperature is set according to the distance between the KR desulfurization station and the subsequent process. The tapping temperature of a steel mill is generally controlled to be more than 1500 ℃, the temperature of molten iron is high, slag iron separation is facilitated, the tapping rate is improved, the control of sulfur components of the molten iron is facilitated, and meanwhile, the low tapping temperature can influence the smooth operation of a blast furnace.
In the feeding and stirring model determined in the step S2, the temperature drop ranges are partially overlapped, so that the production rhythm problem is considered, and the sulfur content and other components of molten iron meet the requirements, so that the production of the converter cannot be influenced even though the temperature is not treated. But the temperature of molten iron is too high, so that the difficulty of converter smelting is increased. Under the condition of not influencing the production of the converter, the time is abundant, the stirring is more than the feeding and less than the stirring when the time is short, and the final aim is to reduce the temperature to a proper range, thereby creating good conditions for the converter. After the specific temperature drop value is determined, firstly, judging the given treatment time, calculating the temperature drop range according to the entering temperature, then selecting the limestone adding amount, and determining the corresponding stirring time.
Preferably, in step S3, the paddle lowering position control is required as follows:
| Hot metal bottle headroom h (mm) | 600≤h＜700 | 700≤h＜800 | 800≤h＜900 | 900≤h |
| Lowered position (mm) of stirring paddle | 1500 | 1400 | 1300 | 1200 |
。
Preferably, in the step S3, the rotation speed range of the stirring paddle is 5rpm-130rpm; further preferably, the stirring paddle is operated at a low rotation speed of 5rpm to 10rpm during the limestone addition, and is operated at a medium speed of 80rpm to 100rpm or at a high speed of 100rpm to 130rpm after the limestone addition is completed.
Preferably, in the step S3, the feeding speed of the limestone is 100kg/min-500kg/min; further preferably, the limestone is fed at a rate of 200kg/min to 300kg/min.
The invention has the beneficial effects that:
1. In the method provided by the application, the price of the limestone is within 100 yuan/ton, and the price advantage is obvious compared with other materials; the cooling effect of the limestone is about 3-4 times of that of the scrap steel, so that the temperature of molten iron can be effectively reduced; according to the organic combination of the limestone feeding speed and the stirring paddle rotating speed, the efficient and rapid cooling effect can be realized; the CaO content in the limestone is above 50%, and the limestone is heated and decomposed to generate CaO, so that the quick formation of the high-alkalinity furnace slag is facilitated; after the limestone is added with high-temperature molten iron, ca O is quickly decomposed and generated, the hardness is far less than that of iron-containing materials such as iron blocks, sintered ores and the like, the impact abrasion to the stirring paddle is small, and the long-service life of the stirring paddle is facilitated.
2. According to the application, the limestone is selected as the optimal material for cooling the molten iron in the KR desulfurization process in comprehensive consideration of the aspects of material transportation, cooling effect, use cost, stirring paddle service life and the like, so that the cooling work of high-temperature molten iron can be well completed, the molten iron entering the furnace is ensured to meet the requirements of the converter smelting process, and good conditions are created for converter smelting.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution in the present application, the following description clearly and completely describes the technical solution in the embodiment of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
The present invention will be further illustrated with reference to examples and comparative examples.
Example 1
In the embodiment, the total weight of molten iron required by HRB400E-2 steel grade is 144.1 tons, the sulfur content in the molten iron is 0.032 percent and reaches the production requirement of the steel grade, the clearance of a molten iron tank is 610mm, the temperature of the molten iron measured by a KR desulfurization station is 1414 ℃, and the temperature of the molten iron is required to be reduced to below 1400 ℃ according to the production requirement, and the method specifically comprises the following steps:
s1, conveying limestone with the granularity range of 10mm-40mm to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the molten iron arrival temperature and the molten iron preset temperature, wherein in the embodiment, the given treatment time is 17min, and the working time of planing, temperature measurement, sampling, starting, hanging and tank and the like is required to be controlled within 5min, so that the treatment is performed with reference to the temperature falling range of 10-20 ℃;
s3, the clearance of the hot-metal ladle is 610mm, the stirring paddle is lowered to a working depth of 1500mm, and 532kg of limestone is added at a feeding speed of 200kg/min in the process that the stirring paddle rotates at a rotating speed of 10 rpm; after the limestone is fed, the stirring paddle rotates at 120 revolutions per minute;
S4, after stirring for 5min, stopping stirring, lifting the stirring paddle, measuring the temperature of the molten iron to be 1399 ℃, reaching a preset range, and leaving the station.
Example 2
In the embodiment, the total weight of molten iron required by HRB500E-1 steel grade is 145.4 tons, the sulfur content in the molten iron is 0.027 percent and reaches the requirement of the steel grade, the clearance of a molten iron tank is 740mm, the temperature of the molten iron measured by a KR desulfurization station is 1447 ℃, and the temperature of the molten iron is required to be reduced to below 1400 ℃ according to production requirements, and the method specifically comprises the following steps of:
s1, conveying limestone with the granularity range of 10mm-40mm to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the molten iron arrival temperature and the molten iron preset temperature, wherein in the embodiment, the given treatment time is 27min, and the working time of planing, temperature measurement, sampling, starting, hanging and tank and the like is required to be controlled within 15min, so that the treatment is performed with reference to the temperature falling range of 45-55 ℃;
s3, the clearance of the hot-metal ladle is 740mm, so that the stirring paddle is lowered to the working depth of 1400mm, and 1595kg of limestone is added at the feeding speed of 300kg/min in the process that the stirring paddle rotates at the rotating speed of 10 rpm; after the limestone is fed, the stirring paddle rotates at 110 revolutions per minute;
S4, after stirring for 14min, stopping stirring, lifting the stirring paddle, measuring the temperature of molten iron to 1400 ℃, reaching a preset range, and exiting.
Example 3
In the embodiment, the total weight of the molten iron required by the Q235B steel grade is 132.3 tons, the sulfur content in the molten iron is 0.023 percent and reaches the requirement of the steel grade, the clearance of a molten iron tank is 920mm, the temperature of the molten iron measured by a KR desulfurization station is 1431 ℃, and the temperature of the molten iron is required to be reduced to below 1400 ℃ according to the production requirement, and the method specifically comprises the following steps of:
s1, conveying limestone with the granularity range of 10mm-40mm to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the molten iron arrival temperature and the molten iron preset temperature, wherein in the embodiment, the given treatment time is 22min, and the working time of planing, temperature measurement, sampling, starting, hanging and tank and the like is less than or equal to 10min, so that the treatment is performed with reference to the temperature falling range of 25-35 ℃;
S3, the clearance of the hot-metal ladle is 920mm, so that the stirring paddle is lowered to a working depth of 1200mm, and 1595kg of limestone is added at a feeding speed of 300kg/min in the process that the stirring paddle rotates at a rotating speed of 10 rpm; after the limestone is fed, the stirring paddle rotates at 100 revolutions per minute;
S4, after stirring for 9min, stopping stirring, lifting the stirring paddle, measuring the temperature of the molten iron to be 1399 ℃, reaching a preset range, and discharging.
Example 4
In the embodiment, the total weight of the molten iron required by the Q335B steel grade is 126.5 tons, the sulfur content in the molten iron is 0.017 percent and reaches the requirement of the steel grade, the clearance of a molten iron tank is 800mm, the temperature of the molten iron measured by a KR desulfurization station is 1425 ℃, and the temperature of the molten iron is required to be reduced to below 1400 ℃ according to the production requirement, and the method specifically comprises the following steps:
s1, conveying limestone with the granularity range of 10mm-40mm to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the molten iron arrival temperature and the molten iron preset temperature, wherein in the embodiment, the given treatment time is 24min, the working time of planing, temperature measurement, sampling, starting, hanging and tank and the like is less than or equal to 12min, and the principle of 'less feeding and more stirring' is adopted, so that the treatment is performed with reference to the temperature falling range of 25-35 ℃;
S3, the clearance of the hot-metal ladle is 800mm, so that the stirring paddle is lowered to the working depth of 1300mm, and 644kg of limestone is added at the feeding speed of 200kg/min in the process that the stirring paddle rotates at the rotating speed of 10 rpm; after the limestone is fed, the stirring paddle rotates at 90 revolutions per minute;
S4, after stirring for 8min, stopping stirring, lifting the stirring paddle, measuring the temperature of molten iron to be 1397 ℃, reaching a preset range, and exiting.
Comparative example 1
In the comparative example, the reference numbers and parameters of molten iron are the same as those of the embodiment 1, the weight of the molten iron is 131.6 tons, the clearance of a molten iron tank is 630mm, the temperature of the molten iron is 1444 ℃ measured by a KR desulfurization station, and the molten iron is required to be reduced to below 1400 ℃ according to the production requirement, and the operation is carried out according to the following required procedures:
S1, lifting a first iron hanging block from an iron block storage area by using a crane with an electromagnetic chuck according to the entering temperature and the preset temperature of molten iron, suspending the first iron hanging block to a position about 30cm above the liquid level of a molten iron tank, baking the iron blocks for about 30 seconds by using radiant heat of the molten iron tank, and releasing electromagnetic force to enable the iron blocks to fall into the molten iron. And similarly, continuously adding a second crane and a third crane, and adding 3 tons of iron blocks in total.
S2, stirring for 7 minutes by using a KR stirring paddle, and measuring the temperature of molten iron 1398 ℃ after the iron blocks are completely melted, and discharging.
Comparative example 2
In the comparative example, the reference numbers and parameters of molten iron are the same as those of the embodiment 1, the weight of molten iron is 143.8 tons, the clearance of a molten iron tank is 580mm, the temperature of molten iron is 1433 ℃ measured by a KR desulfurization station, and according to the production requirement, the temperature of molten iron is required to be reduced to below 1400 ℃, and the operation is carried out according to the following requirement:
S1, crushing the sintered ore with the iron content within the range of 50-57% by using a Raymond mill, and processing the crushed sintered ore to the granularity within 3 mm.
S2, conveying the sintered mineral powder to a KR desulfurization top bin by a special tank truck and utilizing high-pressure nitrogen.
S3, weighing 1021kg of sintered mineral powder according to the entering temperature and the preset temperature of molten iron, and blowing the sintered mineral powder into a molten iron tank through a material pipe by using high-pressure nitrogen.
S4, stopping stirring after stirring for 15 minutes, measuring the temperature of molten iron at 1400 ℃, and discharging.
Comparative example 3
In the comparative example, the reference number and parameters of molten iron are the same as those of the embodiment 1, the weight of the molten iron is 127.1 tons, the clearance of a molten iron tank is 760mm, the temperature of the molten iron is 1426 ℃ measured by a KR desulfurization station, and the molten iron is required to be reduced to below 1400 ℃ according to production requirements and is operated according to the following required procedures:
s1, collecting converter dust by using a special suction and discharge vehicle, and transporting the converter dust to a storage bin by using high-pressure nitrogen for standby.
S2, according to the temperature measurement of the incoming molten iron and the preset temperature of the molten iron, the converter dust with the weight of 1.5t is blown into the molten iron tank from the bin by utilizing high-pressure nitrogen, and simultaneously stirring is carried out, so that the molten iron generates vortex, and the converter dust put into the liquid level of the molten iron is involved in the molten iron.
S3, monitoring the temperature in the hot-metal ladle in real time, starting from the beginning of adding the dedusting ash, stirring for 5 minutes, and reducing the temperature of the molten iron to 1417 ℃ after reducing the temperature of the molten iron to 9 ℃.
S4, blowing 2.8t converter dust into the hot-metal bottle again by utilizing high-pressure nitrogen, continuously stirring for 8 minutes, measuring the temperature of molten iron at 1400 ℃, and discharging.
Examples 1 to 4 and comparative examples 1 to 3 were compared with the KR desulphurized molten iron cooling method as follows:
By comprehensively comparing the aspects of material transportation and purchase price, equipment investment, treatment period, material consumption, energy consumption and the like, the method can be used for: the limestone is used for cooling the KR desulfurization high-temperature molten iron, so that the advantage is obvious. Meanwhile, after the limestone is used for KR desulfurized molten iron cooling treatment, the erosion rate of the stirring paddle is obviously slowed down compared with other modes, and the service life of the stirring paddle is effectively prolonged.
Claims (6)
1. The method for cooling KR desulfurized molten iron by utilizing limestone is characterized by comprising the following steps:
s1, conveying limestone to a KR desulfurization station ejection bin for standby;
S2, determining a feeding stirring model according to the incoming temperature of molten iron and a temperature preset range;
s3, lowering the stirring paddle, and adding limestone in the rotation process of the stirring paddle;
s4, measuring the temperature of molten iron after stirring is finished, and when the temperature reaches a preset range, discharging, and when the temperature does not reach the preset range, repeating the step S2 and the step S3 until the temperature reaches the preset range;
The charging and stirring model in the step S2 is as follows:
2. A method according to claim 1, wherein in step S1 the limestone has a particle size in the range of 10mm to 40mm and a moisture content of < 0.5%.
3. The method of claim 1, wherein in step S3, the paddle lowering position control is required as follows:
。
4. The method of claim 1, wherein in step S3, the rotation speed of the stirring paddle is in the range of 5rpm to 130rpm; further preferably, the stirring paddle is operated at a low rotation speed of 5rpm to 10rpm during the limestone addition, and is operated at a medium speed of 80rpm to 100rpm or at a high speed of 100rpm to 130rpm after the limestone addition is completed.
5. The method according to claim 1, wherein in step S3, the limestone is fed at a rate of 100kg/min to 500kg/min; further preferably, the limestone is fed at a rate of 200kg/min to 300kg/min.
6. The method of claim 1, wherein in step S2, the preset range of the molten iron temperature is set according to the distance between the KR desulfurization station and the subsequent process.
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| CN202410280726.9A CN118147387A (en) | 2024-03-12 | 2024-03-12 | Method for cooling KR desulfurized molten iron by utilizing limestone |
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