CN105838846A - Method for controlling basicity of LF refining slag - Google Patents
Method for controlling basicity of LF refining slag Download PDFInfo
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- CN105838846A CN105838846A CN201610340668.XA CN201610340668A CN105838846A CN 105838846 A CN105838846 A CN 105838846A CN 201610340668 A CN201610340668 A CN 201610340668A CN 105838846 A CN105838846 A CN 105838846A
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- slag
- amount
- basicity
- refining
- ladle
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- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for controlling the basicity of LF refining slag. The method comprises the steps of 1, making a steel ladle enter an argon blowing position for measuring the height of the slag of the steel ladle after tapping is completed; 2, adding lime and fluorite into the refining slag for slag formation after the argon blowing operation and the temperature measurement operation are completed; 3, carrying out LF refining electrifying, slag melting and deoxidizing, calculating the amount of lime needed for silicon oxidation in deoxidization alloying after electrifying is carried out for 3-5 minutes and adding the lime needed for silicon oxidation in deoxidization alloying and the fluorite into the refining slag for further slag modifying according to the calculation result; and 4, measuring whether the basicity of the refining slag meets the optimum basicity requirement of the refining slag after slag melting and deoxidizing. According to the method, the amount of the added lime is calculated through silicon balance, control over the basicity of the refining slag is accurate, the ability of the refining slag to adsorb impurities is improved, and the refining effect is improved.
Description
Technical field
The present invention relates to metallurgical technology field, in particular it relates to a kind of side controlling LF refinery cinder basicity
Method.
Background technology
At present refinery cinder basicity controls to use empirical value (that is: with the amount of being actually added into of Calx flat in production process
The meansigma methods of average and refining slag basicity is as with reference to the empirical value drawn), due to oxidisability, the slag of each stove molten steel
The differences such as amount, the addition of Calx is accurate not, causes refine finishing slag basicity and slag system component fluctuation, affects molten steel
The floating of middle field trash and removal, thus affect the lifting of Cleanliness of Molten Steel and the raising of product quality.
Summary of the invention
It is an object of the invention to, it is provided that a kind of method controlling LF refinery cinder basicity, by measuring in ladle
Refine silicone content at the beginning of slag height, analysis molten steel, determine refining furnace lime adding amount according to element silicon counterbalanced procedure, it is achieved
Refining furnace basicity of slag is precisely controlled, and improves refine metallurgical effect.
For reaching above-mentioned purpose, the technical solution adopted in the present invention is as follows:
A kind of method controlling LF refinery cinder basicity, said method comprising the steps of:
1) after tapping, ladle enters Argon position and measures ladle slag height, calculates converter slag according to the following equation
Amount:
The quantity of slag=3.14 × slag height × ladle radius under converter2× slag density；
2) the Argon operation complete backward refinery cinder of thermometric adds Calx and fluorite slag making, lime adding amount according under
State formula to calculate:
Lime adding amount=(SiO in converter slag2In content × refinery cinder optimum alkalinity value-converter slag, CaO contains
Amount) effective CaO content in the quantity of slag/Calx under × converter；
3) LF refine energising, change slag, deoxidation, after energising 3-5min, calculate deoxidation alloying according to the following equation
The oxidation of middle element silicon need to add amount of lime, and according to the result calculated, element silicon oxidation in deoxidation alloying need to be added stone
Ash quantity and fluorite add and carry out residue adjustment in refinery cinder further:
In deoxidation alloying, element silicon oxidation need to add amount of lime=[(silicon-containing alloy addition × Silicon In Alloys content/molten steel
Amount) refine silicon composition at the beginning of-molten steel] × SiO2With in CaO molecular weight ratio × molten steel amount × refinery cinder optimum alkalinity/Calx
Effective CaO content, wherein, slag weight in molten steel amount=ladle gross weight-sky bag weight-ladle；
4), after changing slag deoxidation, measure refinery cinder basicity and meet refinery cinder optimum alkalinity requirement.
Preferably, described optimum alkalinity is 3.0-4.0.
Further, step 4) after carry out measuring temp of molten steel, soft blow, line feeding.
In the present invention, converter slag composition is analyzed by fluorescence analyser.
In the present invention, refined molten steel molten steel sampler is sampled, and carries out molten steel silicone content with spectroanalysis instrument and divides
Analysis.
In the present invention, the step of not narration in detail can use the ordinary skill in the art.
The present invention has a following beneficial effect:
1) present invention precisely adds Calx when being smelted by element silicon Balancing relization refining furnace, makes refinery cinder basicity reach
To Optimal Control value, improve metallurgical effect, reduce refined molten steel inclusion content.
2) present invention adds amount of lime by element silicon balance, improves Calx utilization rate.
Detailed description of the invention
Below in conjunction with embodiment, comparative example, the present invention will be further described, but protection scope of the present invention is not limited to
This.
Embodiment 1: using 100 tons of ladle refining furnaces to carry out smelting J65Mn, feeding quantity is for calculating addition.
J65Mn refine target slag system component and basicity such as table 1:
Table 1J65Mn refining slag system compositional range
1. complete being opened by buggy ladle of tapping carries out slag elevation carrection to Argon position, and slag height is 60mm, by ladle
Car drives refine position into and carries out Argon operation, and after thermometric, refining operation work adds Calx according to result calculated below.
(1) converter slag amount M in ladle is calculated
Slag height H=60mm, slag density P=3.5g/cm3, ladle inside radius r=1.41m, then:
Quantity of slag M=3.14*r under converter2* H*P=3.14*1.412* 0.06*3.5*1000=1310.95Kg；
(2) calculating adds converter slag Calx additional amount N in ladle in refinery cinder1
CaO%=48%, SiO in fluorescence assays converter slag composition2%=18%, effective CaO in CalxEffectively=80%,
J65Mn refining slag alkalinity ranges 3.0-4.0, takes desired value R=3.5, then:
Add converter slag Calx additional amount N in ladle1=(SiO2%*R-CaO%) * M/CaOEffectively=
(18%*3.5-48%) * 1310.95/80%=245.8Kg；
(3) calculate element silicon oxidation in deoxidation alloying and need to add amount of lime N2:
Converter silicon-containing alloy addition 500Kg, silicon content 75%, just refines Si:0.003%, in Calx effectively
CaOEffectively=80%, J65Mn refining slag alkalinity ranges 3.0-4.0, takes desired value R=3.5, molten steel amount=161.31 (steel
Bag gross weight)-60 (empty bag weight)-1.31 (quantity of slag)=100 ton, CaO molecular weight 56, SiO2Molecular weight 60
Then in deoxidation alloying, element silicon amount of oxidation need to add amount of lime
N2=[(500*75%)/(100*1000)-0.003] * 60/56*100*1000*3.5/80%=351.6Kg
2. add 246Kg Calx according to result of calculation (2) refining operation work and suitable fluorite carries out slag making, LF essence
Refining process is initially powered up, changes slag, and in galvanization, constantly drift killing carries out deoxidation, after energising 3-5min,
Add 352kg Calx according to result of calculation (3) and suitable fluorite carries out residue adjustment further, carry out after putting into Calx
Power-on servicing, is sampled after slagization is good, and slag takes terminal sample after adjusting, and composition carries out steel after meeting the requirements
The work such as water thermometric, soft blow, line feeding.
This stove departures slag is normal, and assay refinery cinder basicity is 3.52, and refinery cinder TFeo+MnO is
0.809%；In steel, total inclusion content is 2.0.
Comparative example 1: using 100 tons of ladle refining furnaces to carry out smelting J65Mn, feeding quantity is experience addition.
1) complete being opened by buggy ladle to refining furnace of tapping carries out Argon operation, after thermometric, refining operation work according to
The slag situation that enters the station and empirical value carry out power-on servicing after adding 300kg Calx, are sampled after slagization is good, according to
Slag situation adds Calx 200kg and carries out residue adjustment, finds that slag does not reaches HUANGBAI(sic) slag requirement, adds again 100Kg Calx
Adjusting slag condition, slag takes terminal sample after adjusting, composition carries out measuring temp of molten steel, soft blow, line feeding etc. after meeting the requirements
Work.
2) this stove departures slag is the most viscous, and assay refinery cinder basicity is 4.17, and refinery cinder TFeo+MnO is
7.50%；In steel, total inclusion content is 4.0.
Embodiment 1 is listed in the table below in 2 with the slag composition situation of comparative example 1
Table 2 refinery cinder composition contrast table
From the point of view of above refinery cinder testing result, use the present invention method control refinery cinder basicity substantially than
Traditional control method is accurate, and slag fluidity is good and slag adsorbs the more former slag of ability being mingled with by force, the control of field trash
Controlling the water circulation is flat to be obviously improved, and total rank controls below 2.5 grades.
J65Mn Control and Inclusion Removal standard is as shown in table 3:
Table 3J65Mn Control and Inclusion Removal standard
The steel of embodiment 1 and comparative example 1 are mingled with situation and are listed in the table below in 4
Table 4 steel are mingled with situation contrast table
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although
With reference to embodiment, the present invention is described in detail, it will be apparent to an ordinarily skilled person in the art that the present invention
Technical scheme modify or equivalent, without departure from the spirit and scope of technical solution of the present invention, it is equal
Should contain in the middle of scope of the presently claimed invention.
Claims (3)
1. the method controlling LF refinery cinder basicity, said method comprising the steps of:
1) after tapping, ladle enters Argon position and measures ladle slag height, calculates converter slag according to the following equation
Amount:
The quantity of slag=3.14 × slag height × ladle radius under converter2× slag density；
2) the Argon operation complete backward refinery cinder of thermometric adds Calx and fluorite slag making, the addition of Calx according to
Following formula calculates:
Lime adding amount=(SiO in converter slag2In content × refinery cinder optimum alkalinity value-converter slag, CaO contains
Amount) effective CaO content in the quantity of slag/Calx under × converter；
3) LF refine energising, change slag, deoxidation, after energising 3-5min, calculate deoxidation alloying according to the following equation
The oxidation of middle element silicon need to add amount of lime, and according to the result calculated, element silicon oxidation in deoxidation alloying need to be added stone
Grey addition with fluorite carries out residue adjustment further in refinery cinder:
In deoxidation alloying, element silicon oxidation need to add amount of lime=[(silicon-containing alloy addition × Silicon In Alloys content/molten steel
Amount) refine silicon composition at the beginning of-molten steel] × SiO2With in CaO molecular weight ratio × molten steel amount × refinery cinder optimum alkalinity/Calx
Effective CaO content, wherein, slag weight in molten steel amount=ladle gross weight-sky bag weight-ladle；
4), after changing slag deoxidation, measure refinery cinder basicity and meet refinery cinder optimum alkalinity requirement.
A kind of method controlling LF refinery cinder basicity the most according to claim 1, it is characterised in that institute
Stating optimum alkalinity is 3.0-4.0.
A kind of method controlling LF refinery cinder basicity the most according to claim 1, it is characterised in that step
Rapid 4) measuring temp of molten steel, soft blow, line feeding are carried out after.
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| CN201610340668.XA CN105838846A (en) | 2016-05-19 | 2016-05-19 | Method for controlling basicity of LF refining slag |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN107475477A (en) * | 2017-07-28 | 2017-12-15 | 武汉钢铁有限公司 | A kind of method of the quantity of slag under measure converter |
| CN111321273A (en) * | 2020-03-16 | 2020-06-23 | 马鞍山钢铁股份有限公司 | Method for accurately controlling alkalinity of 42CrMo steel refining slag |
| CN112560218A (en) * | 2020-11-10 | 2021-03-26 | 北京科技大学 | LF refining slagging lime addition amount prediction method and system and LF refining method |
| CN114507766A (en) * | 2020-11-15 | 2022-05-17 | 上海梅山钢铁股份有限公司 | LF refining slag material feeding proportioning control method |
| CN115537501A (en) * | 2022-11-03 | 2022-12-30 | 石横特钢集团有限公司 | Slagging method for adding fluorite and refining pellets in LF (ladle furnace) |
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| CN103233096A (en) * | 2013-04-25 | 2013-08-07 | 武汉钢铁(集团)公司 | Low-carbon deep-desulfurization refining method of LF (ladle refining) furnace |
| CN103572001A (en) * | 2013-11-01 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag |
| CN103866088A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN106755734B (en) * | 2016-12-14 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN107475477A (en) * | 2017-07-28 | 2017-12-15 | 武汉钢铁有限公司 | A kind of method of the quantity of slag under measure converter |
| CN111321273A (en) * | 2020-03-16 | 2020-06-23 | 马鞍山钢铁股份有限公司 | Method for accurately controlling alkalinity of 42CrMo steel refining slag |
| CN111321273B (en) * | 2020-03-16 | 2021-06-15 | 马鞍山钢铁股份有限公司 | Method for accurately controlling alkalinity of 42CrMo steel refining slag |
| CN112560218A (en) * | 2020-11-10 | 2021-03-26 | 北京科技大学 | LF refining slagging lime addition amount prediction method and system and LF refining method |
| CN112560218B (en) * | 2020-11-10 | 2021-09-03 | 北京科技大学 | LF refining slagging lime addition amount prediction method and system and LF refining method |
| US11326217B1 (en) * | 2020-11-10 | 2022-05-10 | University Of Science And Technology Beijing | Method and system for predicting addition amount of slagging lime during LF refining, and LF refining method |
| CN114507766A (en) * | 2020-11-15 | 2022-05-17 | 上海梅山钢铁股份有限公司 | LF refining slag material feeding proportioning control method |
| CN115537501A (en) * | 2022-11-03 | 2022-12-30 | 石横特钢集团有限公司 | Slagging method for adding fluorite and refining pellets in LF (ladle furnace) |
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