CN106987676B - 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
CN106987676B
CN106987676B CN201710074989.4A CN201710074989A CN106987676B CN 106987676 B CN106987676 B CN 106987676B CN 201710074989 A CN201710074989 A CN 201710074989A CN 106987676 B CN106987676 B CN 106987676B
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basicity
slag
parameter
converter
outlet temperature
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CN106987676A (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

Abstract

The invention discloses a kind of converter basicity dynamic control methods, single-slag practice based on 0.15 wt% of molten iron silicon content≤[Si]≤0.8wt%, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, converter quantity of slag setting adjusting parameter are modified 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, it realizes the adjustment of basicity dynamic linear, 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 methods, belong to steelmaking technical field.
Background technology
Pneumatic steelmaking is mainly using molten iron and steel scrap as the method for making steel of raw material.Heating and decarburization are carried out by oxygen blast, is passed through Slag making removal [S [, [P].Wherein dephosphorization is one of main task.
The dephosphorization efficiency of converter needs to reach 85% or more, and the principal element for influencing 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 affected to dephosphorization effect and steel-making cost.
Si contents are clinker SiO in molten iron2Main source, converter use lime as slag former generate CaO, in order to Ensure certain dual alkalinity, need to increase lime usage amount and then increases the quantity of slag.How in the premise for ensureing dephosphorization effect It is lower to have balanced basicity and the relationship of the quantity of slag is most important to pneumatic steelmaking cost.
Converter current steel mill widespread practice is fixed basicity, reaches the dephosphorization effect under the conditions of various silicone contents；It presses Molten iron silicon setting stepwise basicity, high silicon low alkalinity, low silicon high alkalinity, the above method do not fully consider shadow of the quantity of slag to dephosphorization It rings, dephosphorization cost is caused to increase.
Invention content
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 the adjustment of basicity dynamic linear, 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 is based on single slag of 0.15 wt % of molten iron silicon content≤[Si]≤0.8wt% Operation, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, converter quantity of slag setting adjusting parameter are modified basicity, to alkali Degree carries out dynamic linear adjustment.
Preferably, 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 are 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 the way that lime or lime stone is added.
Lime CaO >=80% is added in of the present invention bessemerize in the process, and the content between granularity 10mm-50mm >= 80wt%, granularity 10mm content≤10wt% below, granularity 50mm or more≤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 two are formed with the CaO in lime First basicity.
Formula is shown in involved chemical reaction（1）：
[SI]+ 2[O])=(SiO2) （1）
Formula is shown in involved chemical reaction（2）：
R= CaO/SiO2 （2）
According to molten iron silicon content, after obtaining hot metal composition before bessemerizing, according to the basicity of setting, calculates lime and be added Amount.The present invention, which considers basicity and the quantity of slag, influences dephosphorization, reaches converter smelting target with least cost.
The parameters such as outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency are set first to immobilize, and pass through calculated The fundamental formular of finishing slag basicity and 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 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 ×（Set 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 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 the quantity of slag）.
It is using advantageous effect caused by above-mentioned technical proposal：
The present invention has considered the quantity of slag, basicity of slag, finished product phosphorus content requirement, and outlet temperature and endpoint carbon content etc. are more Influence of the kind factor to dephosphorization effect, realizes the adjustment of basicity dynamic linear, dephosphorization is realized with minimum cost, in STEELMAKING PRODUCTION factory In have application value.
Specific implementation mode
The present invention is described further with reference to embodiment；
In following embodiment, converter is smelted using conventional, using molten iron+steel scrap pattern, hot metal ratio > 86%.
Embodiment 1
The control of this converter dynamic basicity 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%, the converter quantity of slag Basic basicity R1=2.71 that 100Kg/t is 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%, the converter quantity of slag Basic basicity R1=2.85 that 100Kg/t is 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%, the converter quantity of slag Basic basicity R1=3.05 that 100Kg/t is 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%, the converter quantity of slag Basic basicity R1=4.19 that 100Kg/t is 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%, the converter quantity of slag Basic basicity R1=3.45 that 100Kg/t is 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 (1)

1. a kind of converter basicity dynamic control method, it is characterised in that：Based on molten iron silicon content 0.15 wt %≤[Si]≤ The single-slag practice of 0.8wt%, outlet temperature, aim carbon, terminal phosphorus, dephosphorization efficiency, the converter quantity of slag setting adjusting parameter to basicity into Row is corrected, and to basicity progress dynamic linear adjustment, 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 joins for outlet temperature Number, b are aim carbon parameter, and c is terminal phosphorus parameter, and d is dephosphorization efficiency parameters, and e is converter quantity of slag parameter；Set outlet temperature 1620℃-1720℃；Aim carbon 0.02%-0.08%；Terminal phosphorus 0.008%-0.020%；Molten iron phosphorus < 0.150%；Outlet temperature Correction factor is 0.012, outlet temperature parameter a=0.012 ×（Set temperature-target temperature）；The correction factor of aim carbon be- 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 ginseng Number 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 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 the quantity of slag）.
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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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