CN107287375A - A kind of method of molten iron pretreatment slag skimming - Google Patents
A kind of method of molten iron pretreatment slag skimming Download PDFInfo
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- CN107287375A CN107287375A CN201610192135.1A CN201610192135A CN107287375A CN 107287375 A CN107287375 A CN 107287375A CN 201610192135 A CN201610192135 A CN 201610192135A CN 107287375 A CN107287375 A CN 107287375A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 325
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 162
- 239000002893 slag Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 15
- 230000023556 desulfurization Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 claims description 4
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 3
- 238000012840 feeding operation Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims 3
- 230000003009 desulfurizing effect Effects 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000010410 dusting Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000009628 steelmaking Methods 0.000 abstract description 7
- 238000009529 body temperature measurement Methods 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 2
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
本发明涉及铁水预处理扒渣领域，具体为一种铁水预处理扒渣的方法。该方法的工艺流程是：铁水进入预处理站→测温取样→投入物料→喷吹→测温取样→铁水扒渣→铁水入转炉。本发明方法通过改变预处理后渣系组成的方法，在预处理工序采用加入一种物料改变预处理后渣系组成减少扒渣带铁量的操作方法，进行预处理后扒渣操作，可以满足预处理后炼钢对铁水少带渣的要求，满足预处理工艺的要求，同时有利于减少渣中带铁量，提高入炉铁水质量。采用该工艺方法可实现预处理扒渣后带铁量减少至20％～30％。The invention relates to the field of slag removal for molten iron pretreatment, in particular to a method for slag removal for molten iron pretreatment. The technological process of the method is as follows: molten iron enters the pretreatment station → temperature measurement and sampling → input of materials → injection → temperature measurement and sampling → molten iron slag removal → molten iron enters the converter. The method of the present invention adopts the method of changing the composition of the slag system after pretreatment, and adopts the operation method of adding a material in the pretreatment process to change the composition of the slag system after pretreatment and reduce the amount of iron in the slag stripping, and the slag stripping operation after the pretreatment can meet the requirements Steelmaking after pretreatment requires less slag in the molten iron, which meets the requirements of the pretreatment process, and at the same time helps to reduce the amount of iron in the slag and improve the quality of molten iron in the furnace. By adopting the process method, the amount of strip iron after pretreatment and slag removal can be reduced to 20%-30%.
Description
技术领域technical field
本发明涉及铁水预处理扒渣领域，具体为一种铁水预处理扒渣的方法。The invention relates to the field of slag removal for molten iron pretreatment, in particular to a method for slag removal for molten iron pretreatment.
背景技术Background technique
预处理后铁水扒渣结束要求：普通钢种入炉[S]≤0.015wt％～0.020wt％，铁渣残厚≤50mm；入炉[S]≤0.003％～0.005％的，铁渣残厚≤20mm；入炉[S]≤0.002％，铁水液面裸露达80％以上。铁水预处理扒渣的常规生产方式为：铁水按规程要求进行脱硫处理后，进入铁水扒渣站，根据钢种要求对铁水进行扒渣操作，铁水经扒渣操作后，达到规程要求的铁渣残厚，然后进行转炉冶炼。Requirements for the end of slagging of molten iron after pretreatment: ordinary steel into the furnace [S] ≤ 0.015wt% ~ 0.020wt%, residual thickness of iron slag ≤ 50mm; furnace [S] ≤ 0.003% ~ 0.005%, residual iron slag ≤20mm; into the furnace [S] ≤0.002%, the exposed molten iron level is more than 80%. The conventional production method of molten iron pretreatment and slag removal is: after the molten iron is desulfurized according to the requirements of the regulations, it enters the molten iron slag removal station, and the molten iron is subjected to slag removal operations according to the requirements of the steel type. After the slag removal operation, the molten iron reaches the iron slag required by the regulations Residual thick, then carry out converter smelting.
然而，按常规方法扒渣的铁水不能满足炼钢对铁水渣残厚(铁渣残厚20mm～50mm)的要求。铁水扒渣站因渣耙型式、铁水罐罐口形状、铁水车倾翻等原因，决定了扒渣后铁水残渣不满足供给炼钢的铁水高质量控制，炼钢必须进行相应补救处理，也就是必须对不满足的铁水进行多加辅料减少回硫处理(实际生产多加部分活性灰)。按常规方法进行扒渣的铁水，因带铁量达到40％～50％以上，增加钢铁料消耗，因渣罐运输限制，无法保证扒渣效果，致使生产运行中使用渣罐数量增加现象而导致无法正常摆布渣罐，无法满足炼钢对入炉铁水精料的要求。Yet, the hot metal that removes slag according to conventional method can't meet the requirement of steelmaking to molten iron slag residual thickness (iron slag residual thickness 20mm～50mm). Due to reasons such as the type of slag rake, the shape of the mouth of the molten iron tank, and the tipping of the molten iron car, the hot metal slag removal station determines that the molten iron residue after slag removal does not meet the high quality control of molten iron supplied to steelmaking. Corresponding remedial treatment must be carried out for steelmaking, that is, The unsatisfactory molten iron must be treated by adding more auxiliary materials to reduce sulfur return (adding more active ash in actual production). Molten iron with slag removal according to the conventional method will increase the consumption of iron and steel materials due to the amount of iron that reaches 40% to 50%, and the slag removal effect cannot be guaranteed due to the limitation of slag tank transportation, resulting in an increase in the number of slag tanks used in production and operation. The slag tank cannot be arranged normally, and the requirements of steelmaking for molten iron concentrate cannot be met.
发明内容Contents of the invention
本发明的目的是提供一种铁水预处理扒渣的方法，以满足转炉对铁水精料入炉的要求，实现转炉连续生产优质钢，并有助于降低渣中含铁量，达到降低钢铁料消耗的目的，改善钢水质量，降低转炉辅料消耗。The purpose of the present invention is to provide a method for pretreatment of molten iron to remove slag, so as to meet the requirements of the converter for the molten iron concentrate to be fed into the furnace, realize the continuous production of high-quality steel by the converter, and help reduce the iron content in the slag, so as to reduce the iron and steel material. The purpose of consumption is to improve the quality of molten steel and reduce the consumption of converter auxiliary materials.
本发明的技术方案是：Technical scheme of the present invention is:
一种铁水预处理扒渣的方法，该方法的工艺流程是：铁水进入预处理站→测温取样，明确铁水初始条件，作为脱硫及喷吹前加入物料的依据→投入物料→喷吹，在铁水进站后，处理前根据铁水温度和渣量状况先加入铁水稀渣剂再行喷吹→测温取样，作为提供给下道工序--转炉的物料，明确入炉S是否满足转炉要求，同时转炉根据铁温和成分进行辅料及废钢加入计算→铁水扒渣→铁水入转炉。A method for removing slag during pretreatment of molten iron. The process flow of the method is: molten iron enters the pretreatment station → temperature measurement and sampling, the initial condition of molten iron is determined, as the basis for adding materials before desulfurization and injection → input materials → injection, in the After the molten iron enters the station, add molten iron thin slag agent according to the temperature of the molten iron and the amount of slag before processing, and then spray → temperature measurement and sampling, as the material provided to the next process - the converter, to determine whether the furnace S meets the requirements of the converter, At the same time, the converter calculates the addition of auxiliary materials and scrap steel according to the temperature and composition of the iron → molten iron slag removal → molten iron into the converter.
所述的铁水预处理扒渣的方法，具体步骤如下：The method for the described molten iron pretreatment slag removal, concrete steps are as follows:
①首先进行正常铁水预处理入站处理；① First, carry out normal molten iron pretreatment inbound treatment;
②进行脱硫前加料操作，利于铁水预处理进一步处理；②The feeding operation before desulfurization is beneficial to the further treatment of molten iron pretreatment;
③进行铁水预处理脱硫控制，经铁水预处理后，完成铁水硫的控制，为铁水扒渣做相应准备；③ Carry out the desulfurization control of molten iron pretreatment, complete the control of molten iron sulfur after the molten iron pretreatment, and make corresponding preparations for the slag removal of molten iron;
④进行铁水扒渣操作，倾翻的铁水罐经渣耙对预处理后铁水进行扒渣处理；④ Carry out the slag removal operation of the molten iron, and the slag removal treatment of the pretreated molten iron by the slag rake on the tipped molten iron tank;
⑤扒渣后铁水提供给转炉进行冶炼。⑤ After slag removal, the molten iron is supplied to the converter for smelting.
所述的铁水预处理扒渣的方法，步骤①中，铁水预处理使用氮气作为载体，采用向铁水罐内联合喷吹镁粉和石灰粉工艺进行脱硫，喷粉结束后，用扒渣耙将铁水罐上部铁渣按规程要求扒出后，再将处理后的铁水吊至转炉使用。In the method for removing slag in the pretreatment of molten iron, in step ①, the pretreatment of molten iron uses nitrogen as a carrier, and adopts a process of jointly spraying magnesium powder and lime powder into the molten iron tank for desulfurization. After the iron slag on the upper part of the molten iron tank is scraped out according to the regulations, the treated molten iron is hoisted to the converter for use.
所述的铁水预处理扒渣的方法，步骤②中，在铁水进站后，处理前根据铁水温度和渣量状况，先加入占铁水重量0.02wt％～1wt％的铁水稀渣剂再行喷吹。In the method for removing slag in the pretreatment of molten iron, in step ②, after the molten iron enters the station, according to the temperature of the molten iron and the amount of slag before the treatment, first add the molten iron thin slag agent accounting for 0.02wt% to 1wt% of the weight of the molten iron, and then spray blow.
所述的铁水预处理扒渣的方法，步骤③中，待进行铁水脱硫的铁水到达铁水预处理站后，根据铁水预处理站初始S、铁水量、铁水温度及转炉钢种对入炉铁水S的要求，进行喷吹镁粉数量计算，并通过在计算机屏幕上发出喷吹命令，采用PLC控制喷吹系统自动进行粉剂喷吹过程，脱硫喷吹完成后，将铁水倾翻车开至扒渣位进行扒渣操作。In the method for removing slag from molten iron pretreatment, in step ③, after the molten iron to be desulfurized arrives at the molten iron pretreatment station, the S According to the requirements, calculate the quantity of magnesium powder to be injected, and issue the injection command on the computer screen, and use the PLC to control the injection system to automatically carry out the powder injection process. After the desulfurization injection is completed, the molten iron dumper is driven to the slag removal position Carry out slag removal operation.
本发明的优点及有益效果是：Advantage of the present invention and beneficial effect are:
1、本发明方法通过改变预处理后渣系组成的方法，在预处理工序采用加入一种物料改变预处理后渣系组成减少扒渣带铁量的操作方法，进行预处理后扒渣操作，可以满足预处理后炼钢对铁水少带渣的要求，满足预处理工艺的要求，同时有利于减少渣中带铁量，提高入炉铁水质量。采用该工艺方法可实现预处理扒渣后带铁量减少至20％～30％。1. The method of the present invention adopts the method of changing the composition of the slag system after pretreatment, and adopts the operation method of adding a kind of material to change the composition of the slag system after pretreatment to reduce the amount of iron in the slag removal in the pretreatment process, and carry out the slag removal operation after the pretreatment, It can meet the requirement of less slag in molten iron for steelmaking after pretreatment, meet the requirements of pretreatment process, and at the same time help to reduce the amount of iron in slag and improve the quality of molten iron in the furnace. By adopting the process method, the amount of strip iron after pretreatment and slag removal can be reduced to 20%-30%.
2、采用该方法可实现为炼钢冶炼高级别钢水提供少渣铁水，同时适用于常规生产各类钢种，并有利于提高入炉铁水质量。2. The method can be used to provide low-slag molten iron for steelmaking and smelting high-grade molten steel. It is also suitable for conventional production of various types of steel and is conducive to improving the quality of molten iron entering the furnace.
具体实施方式detailed description
在具体实施过程中，为了满足转炉连续生产优质钢，完善预处理扒渣操作，采用本发明有效进行预处理后扒渣操作，该方法从控制预处理后渣系组成(降低铁渣粘度，增加渣中铁水回落等)及铁渣的流动性能的工艺角度出发，创造性地开发出铁水预处理扒渣工艺方法，以满足转炉对铁水的要求。其工艺流程是：铁水进入预处理站→测温取样(明确铁水初始条件，作为脱硫及喷吹前加入物料的依据)→投入物料→喷吹(在铁水进站后，处理前根据铁水温度和渣量状况先加入占铁水重量0.02wt％～1wt％的铁水稀渣剂再行喷吹)→测温取样(作为提供给下道工序--转炉的物料，明确入炉S是否满足转炉要求，同时转炉根据铁温和成分进行辅料及废钢加入计算)→铁水扒渣→铁水入转炉，具体如下：In the specific implementation process, in order to meet the continuous production of high-quality steel by the converter, and improve the pretreatment slag removal operation, the slag removal operation after the pretreatment is effectively carried out by using the present invention. From the technical point of view of the molten iron in slag falling back, etc.) and the flow properties of iron slag, the molten iron pretreatment and slag removal process was creatively developed to meet the requirements of the converter for molten iron. The process flow is: molten iron enters the pretreatment station → temperature measurement and sampling (determining the initial conditions of the molten iron, as the basis for adding materials before desulfurization and injection) → inputting materials → injection (after the molten iron enters the station, before processing according to the temperature of the molten iron and The slag amount status is to add molten iron thin slag agent accounting for 0.02wt% to 1wt% of the weight of molten iron before spraying)→Temperature measurement and sampling (as the material provided to the next process--converter, to clarify whether the furnace S meets the requirements of the converter, At the same time, the converter calculates the addition of auxiliary materials and scrap steel according to the temperature and composition of the iron) → molten iron slag removal → molten iron enters the converter, the details are as follows:
①首先进行正常铁水预处理入站处理。①Firstly, carry out normal molten iron pretreatment inbound treatment.
铁水预处理使用氮气作为载体，采用向175吨铁水罐内联合喷吹镁粉和石灰粉工艺进行脱硫，喷粉结束后，用扒渣耙将铁水罐上部铁渣按规程要求扒出后，再将处理后的铁水吊至转炉使用。The pretreatment of molten iron uses nitrogen as a carrier, and adopts the process of spraying magnesium powder and lime powder into the 175-ton molten iron tank for desulfurization. Lift the treated molten iron to the converter for use.
②按新方法进行脱硫前加料操作，利于铁水预处理进一步处理。②The feeding operation before desulfurization is carried out according to the new method, which is beneficial to the further treatment of molten iron pretreatment.
在铁水进站后，处理前根据铁水温度和渣量状况先加入100kg～300kg的铁水稀渣剂再行喷吹。After the molten iron enters the station, 100kg-300kg of molten iron thin slag agent is added according to the temperature of the molten iron and the amount of slag before treatment, and then sprayed.
③进行铁水预处理脱硫控制，经铁水预处理后，完成铁水硫的控制，为铁水扒渣做相应准备。③ Carry out desulfurization control of molten iron pretreatment, complete the control of molten iron sulfur after pretreatment of molten iron, and make corresponding preparations for slag removal of molten iron.
待进行铁水脱硫的铁水到达铁水预处理站后，操作员根据铁水预处理站初始S、铁水量、铁水温度及转炉钢种对入炉铁水S的要求，按模型进行喷吹镁粉数量计算，并通过在计算机屏幕上发出喷吹命令，PLC将控制喷吹系统自动进行粉剂喷吹过程，脱硫喷吹完成后，将铁水倾翻车开至扒渣位进行扒渣操作。After the molten iron to be desulfurized arrives at the molten iron pretreatment station, the operator calculates the amount of magnesium powder to be injected according to the model according to the initial S of the molten iron pretreatment station, the amount of molten iron, the temperature of the molten iron, and the requirements of the converter steel type for the incoming molten iron S. And by issuing an injection command on the computer screen, the PLC will control the injection system to automatically carry out the powder injection process. After the desulfurization injection is completed, the molten iron tipping car is driven to the slag removal position for slag removal operation.
④进行铁水扒渣操作，倾翻的铁水罐经渣耙对预处理后铁水进行扒渣处理。④ Carry out the slag removal operation of the molten iron, and carry out the slag removal treatment on the pretreated molten iron through the slag rake on the tipped molten iron tank.
在脱硫过程中，联合喷吹中使用石灰粉吹造成喷吹后渣层碱度明显增加，铁渣粘度较大，这不仅给预处理扒渣操作带来困难，而且随着扒渣过程因渣铁混淆，大量铁水随着炉渣流失，检测结果表明伴随扒渣的同时带走铁量高达渣量的50％，铁损严重，直接影响了产量及钢铁料消耗指标。另一方面由于渣粘而导致喷粉枪、渣耙粘渣严重、清理困难、耐材寿命降低。由于石灰用量大，会造成热损失增加，使铁水温度下降，故只有采用钝化方法，一方面增加石灰流动性，另一方面也避免了石灰水化反应，此时配合加入适量的降低铁渣熔点的稀渣剂则能较好保持铁渣的流动性，以利于扒渣操作。铁水稀渣剂的投入使用，有效的改变了预处理后铁渣的碱度，促进渣的流动性，使得扒渣操作易于进行，减少扒渣过程中带铁量，减少铁水损失。In the desulfurization process, the use of lime powder in the combined injection will cause the alkalinity of the slag layer to increase significantly after the injection, and the viscosity of the iron slag will be relatively high. The iron is mixed, and a large amount of molten iron is lost along with the slag. The test results show that the amount of iron taken away with the slag removal is as high as 50% of the slag, and the iron loss is serious, which directly affects the output and steel material consumption indicators. On the other hand, due to the slag sticking, the powder gun and the slag rake are seriously stuck to the slag, difficult to clean, and the service life of the refractory material is reduced. Due to the large amount of lime used, it will cause increased heat loss and lower the temperature of molten iron. Therefore, only the passivation method can be used to increase the fluidity of lime on the one hand and avoid the hydration reaction of lime on the other hand. The thinner slag agent with melting point can better maintain the fluidity of iron slag to facilitate the slag removal operation. The use of the molten iron slag agent effectively changes the alkalinity of the pretreated iron slag, promotes the fluidity of the slag, makes the slag removal operation easy, reduces the amount of iron in the slag removal process, and reduces the loss of molten iron.
⑤按新方法扒渣后铁水提供给转炉进行冶炼。⑤ According to the new method, the molten iron is provided to the converter for smelting after slag removal.
实施例结果表明，本发明入炉铁水带渣量少，减少转炉造渣料消耗。铁渣中含铁量减少，铁水带渣量控制及控制渣罐数量的方法。操作简单、工人劳动强度降低的扒渣方法。扒渣操作及防回硫控制。The results of the examples show that the amount of slag carried by the molten iron in the furnace is small in the present invention, which reduces the consumption of converter slagging material. The method for reducing the iron content in iron slag, controlling the amount of slag in molten iron and controlling the number of slag pots. It is a slag removal method with simple operation and reduced labor intensity. Slagging operation and anti-sulfur control.
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| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
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| CN111206134A (en) * | 2020-02-24 | 2020-05-29 | 本钢板材股份有限公司 | Method for improving desulfurization effect by adding limestone in molten iron desulfurization by blowing method |
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