CN106987676A - A kind of converter basicity dynamic control method - Google Patents

A kind of converter basicity dynamic control method Download PDF

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Publication number
CN106987676A
CN106987676A CN201710074989.4A CN201710074989A CN106987676A CN 106987676 A CN106987676 A CN 106987676A CN 201710074989 A CN201710074989 A CN 201710074989A CN 106987676 A CN106987676 A CN 106987676A
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China
Prior art keywords
basicity
converter
slag
parameter
outlet temperature
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CN201710074989.4A
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CN106987676B (en
Inventor
周泉林
王肖
赵铁成
李鹏
周航
邢金栋
李扬
刘海波
尹宽
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TANGSHAN STAINLESS STEEL CO Ltd
Tangshan Iron and Steel Group Co Ltd
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TANGSHAN STAINLESS STEEL CO Ltd
Tangshan Iron and Steel Group Co Ltd
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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C7/064—Dephosphorising; Desulfurising

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of converter basicity dynamic control method, single-slag practice based on molten iron silicon content 0.15wt%≤[Si]≤0.8wt%, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, converter quantity of slag setting adjusting parameter are modified to basicity, and dynamic linear adjustment is carried out to basicity.The present invention has considered the quantity of slag, basicity of slag, finished product phosphorus content requirement, influence of many factors such as outlet temperature and endpoint carbon content to dephosphorization effect, realize that basicity dynamic linear is adjusted, dephosphorization is realized with minimum cost, has application value in STEELMAKING PRODUCTION factory.

Description

A kind of converter basicity dynamic control method
Technical field
The present invention relates to a kind of converter basicity dynamic control method, belong to steelmaking technical field.
Background technology
Pneumatic steelmaking is main using molten iron and steel scrap as the method for making steel of raw material.Heated up and decarburization, passed through by oxygen blast Slag making remove [S [, [P].Wherein dephosphorization is one of main task.
The dephosphorization efficiency of converter needs to reach more than 85%, and the principal element of influence dephosphorization effect is：Clinker CaO/SiO2Two First basicity, the quantity of slag, finishing slag FeO, outlet temperature.When finishing slag FeO, outlet temperature are relatively fixed, clinker CaO/SiO2Dual alkalinity, The quantity of slag is larger on dephosphorization effect and steel-making cost influence.
Si contents are clinker SiO in molten iron2Main source, converter use lime as slag former produce CaO, in order to Ensure certain dual alkalinity, it is necessary to increase lime usage amount and then add the quantity of slag.How the premise of dephosphorization effect is being ensured It is lower to have balanced basicity and the relation pair pneumatic steelmaking cost of the quantity of slag is most important.
Converter current steel mill widespread practice is fixed basicity, reaches the dephosphorization effect under the conditions of various silicone contents；Press Molten iron silicon setting stepwise basicity, high silicon low alkalinity, low silicon high alkalinity, the above method does not take into full account shadow of the quantity of slag to dephosphorization Ring, cause the increase of dephosphorization cost.
The content of the invention
The present invention provides a kind of converter basicity dynamic control method, has considered the quantity of slag, basicity of slag, finished product phosphorus content It is required that, influence of many factors such as outlet temperature and endpoint carbon content to dephosphorization effect realizes that basicity dynamic linear is adjusted, with most Low cost realizes dephosphorization, has application value in STEELMAKING PRODUCTION factory.
The technical solution used in the present invention is：
A kind of converter basicity dynamic control method, single slag behaviour based on the wt % of molten iron silicon content 0.15≤[Si]≤0.8wt% Make, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, converter quantity of slag setting adjusting parameter are modified to basicity, to basicity Carry out dynamic linear adjustment.
It is preferred that, the numerical value of basicity and silicone content meets following formula：y = [（-5.812x3 + 12.47x2 - 9.566x + 5.362）+ a] × b × c × d × (1/e), y is basicity, and x is silicone content, and a is outlet temperature parameter, and b is terminal Carbon parameter, c is terminal phosphorus parameter, and d is dephosphorization efficiency parameters, and e is converter quantity of slag parameter；Set outlet temperature 1620 DEG C -1720 ℃；Aim carbon 0.02%-0.08%；Terminal phosphorus 0.008%-0.020%；Molten iron phosphorus ＜ 0.150%.
It is further preferred that the correction factor of the outlet temperature is 0.012, outlet temperature parameter a=0.012 ×（Setting Temperature-target temperature）.
The correction factor of the aim carbon is -0.8, aim carbon parameter b=- 0.8 ×（Set aim carbon-target endpoint carbon）.
The correction factor of the terminal phosphorus is -2.8, terminal phosphorus parameter c=- 2.8 ×（Set terminal phosphorus-target endpoint phosphorus）.
The correction factor of the dephosphorization efficiency is 0.008, dephosphorization efficiency parameters d=0.008 ×（Set dephosphorization efficiency-target Dephosphorization efficiency）.
The correction factor of the converter quantity of slag is 0.0008, converter quantity of slag parameter e=0.0008 ×（Actual quantity of slag-target slag Amount）.
Basicity is adjusted by adding lime or lime stone.
It is of the present invention bessemerize during add lime CaO >=80%, the content between granularity 10mm-50mm >= 80wt%, below granularity 10mm content≤10wt%, more than granularity 50mm≤10wt%.
The mechanism of action of Main chemical component of the present invention is：
Silicon and oxygen rifle reaction generate SiO in molten iron in typical steelmaking process2, certain diacidic base is formed with the CaO in lime Degree.
Involved chemical reaction is shown in formula（1）：
[SI]+ 2[O])=(SiO2) （1）
Involved chemical reaction is shown in formula（2）：
R= CaO/SiO2 （2）
According to molten iron silicon content, obtained before bessemerizing after hot metal composition, according to the basicity of setting, calculate lime adding amount.This Invention considers basicity and the quantity of slag to be influenceed on dephosphorization, and converter smelting target is reached with least cost.
The parameter such as setting outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency first immobilizes, and passes through calculated Finishing slag basicity and the fundamental formular of molten iron silicon：y = -5.812x3 + 12.47x2 - 9.566x + 5.362。
The quantity of slag, basicity of slag, finished product phosphorus content requirement, many factors such as outlet temperature and endpoint carbon content are considered Influence to dephosphorization effect, increase parameter is modified to basicity in formula：y = [（-5.812x3 + 12.47x2 - 9.566x + 5.362）+a]×b×c×d×(1/e)
Wherein, a is outlet temperature parameter, and b is aim carbon parameter, and c is terminal phosphorus parameter, and d is dephosphorization efficiency parameters, and e is converter Quantity of slag parameter；
The correction factor of outlet temperature is 0.012, outlet temperature parameter a=0.012 ×（Design temperature-target temperature）；
The correction factor of aim carbon is -0.8, aim carbon parameter b=- 0.8 ×（Set aim carbon-target endpoint carbon）；
The correction factor of terminal phosphorus is -2.8, terminal phosphorus parameter c=- 2.8 ×（Set terminal phosphorus-target endpoint phosphorus）；
The correction factor of dephosphorization efficiency is 0.008, dephosphorization efficiency parameters d=0.008 ×（Set dephosphorization efficiency-target dephosphorization effect Rate）；
The correction factor of the converter quantity of slag is 0.0008, converter quantity of slag parameter e=0.0008 ×（Actual quantity of slag-target the quantity of slag）.
It is using the beneficial effect produced by above-mentioned technical proposal：
The present invention has considered the quantity of slag, basicity of slag, finished product phosphorus content requirement, outlet temperature and endpoint carbon content etc. it is a variety of because Influence of the element to dephosphorization effect, realizes that basicity dynamic linear is adjusted, realizes dephosphorization with minimum cost, have in STEELMAKING PRODUCTION factory Application value.
Embodiment
The present invention is described further with reference to embodiment；
In following examples, converter is smelted using conventional, using molten iron+steel scrap pattern, hot metal ratio ＞ 86%.
Embodiment 1
This converter dynamic basicity control uses following specific processing steps.
100 tons of converters are routinely smelted；The initial phosphorus 0.150% of molten iron, molten iron silicon 0.80%；Converter terminal phosphorus [P] requirement≤ 0.020%, outlet temperature target T=1620 DEG C, aim carbon [C] target=0.08%.
Basicity calculation formula y=[（-5.812x3 + 12.47x2- 9.566x + 5.362）+a]×b×c×d× (1/e)
Based on 1650 DEG C of outlet temperature, aim carbon 0.045%, terminal phosphorus 0.015%, dephosphorization efficiency 86%, converter quantity of slag 100Kg/t Basic basicity R1=2.71 calculated；Outlet temperature parameter a=0.972, aim carbon parameter b=0.986, terminal phosphorus parameter c= 1.005, dephosphorization efficiency parameters d=1.001, converter quantity of slag parameter e=1.008；Final basicity R=2.25.
Actual test converter terminal result：
Converter terminal phosphorus [P]=0.018%, outlet temperature target T=1621 DEG C, aim carbon [C]=0.082%, basicity R=2.31.
Embodiment 2
100 tons of converters are routinely smelted；The initial phosphorus 0.130% of molten iron, molten iron silicon 0.60%；Converter terminal phosphorus [P] requirement≤0.008%, Outlet temperature target T=1650 DEG C, aim carbon [C] target=0.02%.
Basicity calculation formula y=[（-5.812x3 + 12.47x2- 9.566x + 5.362）+a]×b×c×d× (1/e)
Based on 1650 DEG C of outlet temperature, aim carbon 0.045%, terminal phosphorus 0.015%, dephosphorization efficiency 86%, converter quantity of slag 100Kg/t Basic basicity R1=2.85 calculated；Outlet temperature parameter a=1.20, aim carbon parameter b=1.20, terminal phosphorus parameter c=1.063, Dephosphorization efficiency parameters d=1.001, converter quantity of slag parameter e=1.000；Final basicity R=3.16.
Actual test converter terminal result：
Converter terminal phosphorus [P]=0.014%, outlet temperature target T=1652 DEG C, aim carbon [C]=0.022%, basicity R=3.14.
Embodiment 3
100 tons of converters are routinely smelted；The initial phosphorus 0.120% of molten iron, molten iron silicon 0.45%；Converter terminal phosphorus [P] requirement≤0.012%, Outlet temperature target T=1720 DEG C, aim carbon [C] target=0.03%.
Basicity calculation formula y=[（-5.812x3 + 12.47x2- 9.566x + 5.362）+a]×b×c×d× (1/e)
Based on 1650 DEG C of outlet temperature, aim carbon 0.045%, terminal phosphorus 0.015%, dephosphorization efficiency 86%, converter quantity of slag 100Kg/t Basic basicity R1=3.05 calculated；Outlet temperature parameter a=1.012, aim carbon parameter b=1.008, terminal phosphorus parameter c= 1.032, dephosphorization efficiency parameters d=1.001, converter quantity of slag parameter e=1.004；Final basicity R=4.08.
Actual test converter terminal result：
Converter terminal phosphorus [P]=0.011%, outlet temperature target T=1722 DEG C, aim carbon [C]=0.031%, basicity R=4.12.
Embodiment 4
100 tons of converters are routinely smelted；The initial phosphorus 0.120% of molten iron, molten iron silicon 0.15%；Converter terminal phosphorus [P] requirement≤0.012%, Outlet temperature target T=1700 DEG C, aim carbon [C] target=0.03%.
Basicity calculation formula y=[（-5.812x3 + 12.47x2- 9.566x + 5.362）+a]×b×c×d× (1/e)
Based on 1650 DEG C of outlet temperature, aim carbon 0.045%, terminal phosphorus 0.015%, dephosphorization efficiency 86%, converter quantity of slag 100Kg/t Basic basicity R1=4.19 calculated；Outlet temperature parameter a=1.012, aim carbon parameter b=1.008, terminal phosphorus parameter c= 1.032, dephosphorization efficiency parameters d=1.001, converter quantity of slag parameter e=0.998；Final basicity R=5.07.
Actual test converter terminal result：
Converter terminal phosphorus [P]=0.011%, outlet temperature target T=1709 DEG C, aim carbon [C]=0.029%, basicity R=5.04.
Embodiment 5
100 tons of converters are routinely smelted；The initial phosphorus 0.150% of molten iron, molten iron silicon 0.30%；Converter terminal phosphorus [P] requirement≤0.008%, Outlet temperature target T=1650 DEG C, aim carbon [C] target=0.03%.
Basicity calculation formula y=(（-5.812x3 + 12.47x2- 9.566x + 5.362.）+a)×b×c×d× (1/e)
Based on 1650 DEG C of outlet temperature, aim carbon 0.045%, terminal phosphorus 0.015%, dephosphorization efficiency 86%, converter quantity of slag 100Kg/t Basic basicity R1=3.45 calculated；Outlet temperature parameter a=1.012, aim carbon parameter b=1.020, terminal phosphorus parameter c= 1.069, dephosphorization efficiency parameters d=1.001, converter quantity of slag parameter e=1.000；Final basicity R=3.82.
Actual test converter terminal result：
Converter terminal phosphorus [P]=0.007%, outlet temperature target T=1649 DEG C, aim carbon [C]=0.029%, basicity R=3.80.

Claims (7)

1. a kind of converter basicity dynamic control method, it is characterised in that：Based on wt %≤[Si] of molten iron silicon content 0.15≤ 0.8wt% single-slag practice, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, converter quantity of slag setting adjusting parameter are entered to basicity Row amendment, dynamic linear adjustment is carried out to basicity.
2. a kind of converter basicity dynamic control method according to claim 1, it is characterised in that：The number of basicity and silicone content Value meets following formula：y = [（-5.812x3 + 12.47x2- 9.566x + 5.362）+ a] × b × c × d × (1/e), y For basicity, x is silicone content, and a is outlet temperature parameter, and b is aim carbon parameter, and c is terminal phosphorus parameter, and d is dephosphorization efficiency parameters, E is converter quantity of slag parameter；Set 1620 DEG C -1720 DEG C of outlet temperature；Aim carbon 0.02%-0.08%；Terminal phosphorus 0.008%- 0.020%；Molten iron phosphorus ＜ 0.150%.
3. a kind of converter basicity dynamic control method according to claim 2, it is characterised in that：The amendment system of outlet temperature Number is 0.012, outlet temperature parameter a=0.012 ×（Design temperature-target temperature）.
4. a kind of converter basicity dynamic control method according to claim 2, it is characterised in that：The correction factor of aim carbon For -0.8, aim carbon parameter b=- 0.8 ×（Set aim carbon-target endpoint carbon）.
5. a kind of converter basicity dynamic control method according to claim 2, it is characterised in that：The correction factor of terminal phosphorus For -2.8, terminal phosphorus parameter c=- 2.8 ×（Set terminal phosphorus-target endpoint phosphorus）.
6. a kind of converter basicity dynamic control method according to claim 2, it is characterised in that：The amendment system of dephosphorization efficiency Number is 0.008, dephosphorization efficiency parameters d=0.008 ×（Set dephosphorization efficiency-target dephosphorization efficiency）.
7. a kind of converter basicity dynamic control method according to claim 2, it is characterised in that：The amendment system of the converter quantity of slag Number is 0.0008, converter quantity of slag parameter e=0.0008 ×（Actual quantity of slag-target the quantity of slag）.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2021191889A (en) * 2020-06-05 2021-12-16 日本製鉄株式会社 Converter blowing control device, statistical model construction device, converter blowing control method, statistical model construction method and program

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CN101463407A (en) * 2008-11-22 2009-06-24 大连理工大学 Method for calculating converter steel melting lime adding amount
JP2011006758A (en) * 2009-06-29 2011-01-13 Sumitomo Metal Ind Ltd Method for dephosphorizing molten iron
JP2016199800A (en) * 2015-04-14 2016-12-01 Ｊｆｅスチール株式会社 Method of dephosphorization of molten iron
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021191889A (en) * 2020-06-05 2021-12-16 日本製鉄株式会社 Converter blowing control device, statistical model construction device, converter blowing control method, statistical model construction method and program
JP7469646B2 (en) 2020-06-05 2024-04-17 日本製鉄株式会社 Converter blowing control device, statistical model building device, converter blowing control method, statistical model building method and program

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