CN105483315B - The method of chrome ore DIRECT ALLOYING in semi-steel making Converter - Google Patents
The method of chrome ore DIRECT ALLOYING in semi-steel making Converter Download PDFInfo
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- CN105483315B CN105483315B CN201610033838.XA CN201610033838A CN105483315B CN 105483315 B CN105483315 B CN 105483315B CN 201610033838 A CN201610033838 A CN 201610033838A CN 105483315 B CN105483315 B CN 105483315B
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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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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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
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Abstract
The present invention relates to the method for chrome ore DIRECT ALLOYING in semi-steel making Converter, belong to metallurgical technology field.Present invention solves the technical problem that the method for being to provide chrome ore DIRECT ALLOYING in semi-steel making Converter.The method comprises the following steps：After half steel is blended into converter, steel scrap, direct top blast oxygen are not added with, while to active lime, dolomitic lime and acid composite fluxing medium is added in stove, oxygen blast is stopped after 7~8min of oxygen blast, and add anthracite carburant, the deslagging of falling stove；Secondary slag making and the direct-reduction of chrome ore are carried out after deslagging, active lime and dolomitic lime is added, while adding Antaciron and controlling basicity of slag, chrome ore is added after 2~3min of top blast oxygen, stop oxygen blast after continuing 3~5min of oxygen blast, add anthracite carburant, tapped after 5~8min of stirring.Temperature not enough problem when the inventive method can not only overcome semisteel smelting and add chrome ore, while ensure that converter has good dephosphorization effect and chromium direct-reduction rate higher.
Description
Technical field
The present invention relates to the method for chrome ore DIRECT ALLOYING in semi-steel making Converter, belong to metallurgical technology field.
Background technology
Chromium is the important alloy of smelting stainless steel, interior hot steel, alloy tool steel, structural alloy steel and polytype cast iron
Element.As the development of national economy is, it is necessary to more stainless, interior heat, the steel of high intensity, the consumption of evanohm is also rapid
Increase.And when these stainless, interior heat, steel products of high intensity are produced, chromium is carried out often by ferrochrome is added
Alloying, ferrochrome consumption is big when this causes STEELMAKING PRODUCTION, and cost of alloy is high.Directly gone back using primary raw materials melting in smelting
The expensive ferroalloy of original substitution, is to reduce one of steel-making cost, approach of energy saving.Therefore, using chrome ore DIRECT ALLOYING
Substituting (high-carbon, low-carbon (LC)) ferrochrome can be greatly lowered steelmaking alloy cost.But electric furnace is directly added into using chrome ore or is turned
There is the problems such as recovery rate is low, and technological parameter is difficult to control in stove.
The method that patent CN103911479A discloses chrome ore direct Reducing and Alloying in a kind of 90t top and bottom combined blown converters.
The method carries out following system in converter smelting：1) steel scrap charging method；2) slag charge is added and oxygen blowing method：It is double using single stove
Slag two-step method smelting process；3) bottom blowing method；4) point blows method；5) other：The related process side of other method routinely steel grade
Method is carried out；The content of crome metal is 0.45~1.05% in the low-alloy molten steel for finally obtaining, and dephosphorization rate is 88~92%.The hair
Bright due to chrome ore is directly added into converter, it is poor that the oxidizing atmosphere in stove causes chromium to reduce, and recovery rate is relatively low, chrome ore utilization
Rate is not high.
The method that patent CN103540705A discloses addition crome metal in a kind of convertor steelmaking process, in pneumatic steelmaking
Cheng Zhong, chromite ore fine and reducing agent are added in steelmaking converter with slag material；Using the high temperature in converter, stirring condition and
The reproducibility of reducing agent restores with to adding crome metal in molten steel in converter the chromium in chromite ore fine.Because converter is
Oxidizing atmosphere, chromite ore fine adds the after-blow oxygen will to influence the reduction effect of chrome ore with slag former, while undeclared should
The recovery rate situation of method converter dephosphorization effect and chromium.
And semi-steel making is low (3.4%~4.0%) due to its more general molten iron of carbon mass percent, silicon, manganese hair in half steel
Hot slagging constituent content is vestige, therefore semisteel smelting has in converting process that acid slagging material is few, slag system constituent element is single, heat
The features such as amount wretched insufficiency, and temperature drop is larger in stove after a large amount of chrome ores of addition in converter, will directly affect converter tapping.Therefore,
During using semisteel smelting in Converter during chrome ore alloying, temperature not enough problem when generally existing adds chrome ore, and half steel is de-
The percent reduction of phosphorus effect and chromium is not also high.
The content of the invention
Present invention solves the technical problem that the method for being to provide chrome ore DIRECT ALLOYING in semi-steel making Converter.The method
Temperature not enough problem when can not only overcome semisteel smelting and add chrome ore, while ensure that there is good dephosphorization to imitate for converter
Fruit and chromium direct-reduction rate higher.
The method of chrome ore DIRECT ALLOYING, comprises the following steps in semi-steel making Converter of the present invention：
A, a slag making：After half steel is blended into converter, steel scrap, direct top blast oxygen, while active to being added in stove are not added with
Lime 10~15kg/t steel, dolomitic lime 8~13kg/t steel, acid 6~10kg/t of composite fluxing medium steel, after 7~8min of oxygen blast
Stop oxygen blast, add anthracite carburant 1~3kg/t steel, the deslagging of falling stove；
B, secondary slag making and the reduction of chrome ore：After deslagging, addition active lime 5~10kg/t steel, dolomitic lime 5~
10kg/t steel, while adding Antaciron and controlling basicity of slag 2~3, top blast oxygen adds chrome ore after 2~3min of oxygen blast
15~25kg/t steel, oxygen blast is stopped after continuing 3~5min of oxygen blast, adds anthracite carburant 4~8kg/t steel, stirs 5~8min
After tap.
Wherein, in a steps, to deslagging since oxygen blast, bottom blowing nitrogen, Nitrogen offerings intensity is 0.1~0.2m3/ mint steel,
Bottom blowing nitrogen during deslagging, Nitrogen offerings intensity is 0.02~0.04m3/ mint steel；In b step, oxygen blast starts to oxygen blast to terminate, bottom
Nitrogen blowing, Nitrogen offerings intensity is 0.04~0.08m3/ mint steel；After adding anthracite carburant, argon bottom-blowing, air supply intensity is
0.15~0.35m3/ mint steel, taps after 5~8min of stirring.
Further, in a steps, the oxygen supply intensity of top blast oxygen is 2~3m3/ mint steel, in b step, top blast oxygen
Oxygen supply intensity be 3~4m3/ mint steel.
Preferably, in a steps, oxygen lance position is 2~2.6m, and in b step, oxygen lance position is 1.3~1.9m.
Further, in b step, after adding chrome ore, oxygen blast is stopped after stirring 3~5min using oxygen rifle oxygen jet, plus
Enter anthracite carburant, 5~8min of bottom blowing stirring and then tapping.
Wherein, the Cr in the chrome ore2O3Content is not less than 40wt%.
The reality for mainly passing through compensated technology in stove, high efficiency dephosphorating technology and later stage chrome ore Direct Reduction Technology of the invention
Apply, the control to slagging regime, oxygen supply by lance system, bottom blowing gas system and chrome ore feed postition etc. can not only overcome half steel
Temperature not enough problem when smelting and adding chrome ore, while ensure that converter has good dephosphorization effect and chromium higher straight
Connect percent reduction.
The method of chrome ore DIRECT ALLOYING in semi-steel making Converter of the present invention, in the feelings that semi-steel making thermal source puts upon the full stretch
Under condition, the reduction of chromium in chrome ore can be realized and with dephosphorization rate higher.
Specific embodiment
The method of chrome ore DIRECT ALLOYING, comprises the following steps in semi-steel making Converter of the present invention：
A, a slag making：After half steel is blended into converter, steel scrap, direct top blast oxygen, while active to being added in stove are not added with
Lime 10~15kg/t steel, dolomitic lime 8~13kg/t steel, acid 6~10kg/t of composite fluxing medium steel, after 7~8min of oxygen blast
Stop oxygen blast, and add anthracite carburant 1~3kg/t steel, the deslagging of falling stove；
B, secondary slag making and the reduction of chrome ore：Secondary slag making and the direct-reduction of chrome ore are carried out after deslagging, active stone is added
Ash 5~10kg/t steel, dolomitic lime 5~10kg/t steel, while adding Antaciron and controlling basicity of slag in 2~3, top blowing oxygen
Gas, adds chrome ore 15~25kg/t steel after 2~3min of oxygen blast, oxygen blast is stopped after continuing 3~5min of oxygen blast, adds anthracite carburetting
Agent 4~8kg/t steel, taps after 5~8min of stirring.
Wherein, active lime and dolomitic lime are the conventional auxiliary material of steel-making, and active lime mainly contains CaO, and its content is not less than
88wt%.Dolomitic lime is mainly that 35~45%, MgO mass fractions are 35~55% containing CaO and MgO, CaO mass fraction.Acid
Property composite fluxing medium be semi-steel making often use acidic excipient, contained SiO2Content is not less than 45wt%.
Basicity of slag of the present invention is CaO/SiO in slag2Ratio.
Further, in a steps, to deslagging since oxygen blast, bottom blowing nitrogen, Nitrogen offerings intensity is 0.1~0.2m3/min·
T steel, bottom blowing nitrogen during deslagging, Nitrogen offerings intensity is 0.02~0.04m3/ mint steel；In b step, oxygen blast starts to oxygen blast knot
Beam, bottom blowing nitrogen, Nitrogen offerings intensity is 0.04~0.08m3/ mint steel；After adding anthracite carburant, argon bottom-blowing, supply
Intensity is 0.15~0.35m3/ mint steel, taps after 5~8min of stirring.
Further, in a steps, the oxygen supply intensity of top blast oxygen is 2~3m3/ mint steel, in b step, top blast oxygen
Oxygen supply intensity be 3~4m3/ mint steel.
Further, in a steps, oxygen lance position is 2~2.6m, and in b step, oxygen lance position is 1.3~1.9m.
Further, in b step, after adding chrome ore, oxygen blast is stopped after stirring 3~5min using oxygen rifle oxygen jet, plus
Enter anthracite carburant, tapped after 5~8min of stirring.
The method of chrome ore DIRECT ALLOYING in semi-steel making Converter of the present invention, in a steps, oxygen blast adds before terminating rear deslagging
Enter the purpose of anthracite carburant 1~3kg/t steel primarily to suppress slag foamed, beneficial to the greatest extent agree energy more than exclusion before
Phase richness phosphorus slag, improves dephosphorization efficiency.Initial smelting period is operated using rifle position high, and FeO contents are high in slag, slag foaming during deslagging
Seriously, it is difficult to pour out.After adding anthracite carburant, carbon reacts with FeO in slag, so that FeO contents in slag are reduced,
Slag foamed is alleviated, and is conducive to deslagging.
The purpose of Antaciron is added in b step mainly two：One is that silicon oxidation improves stove endogenous pyrogen, and two is in oxidation
After form SiO2Play a part of to promote slugging and working the slag basicity.
B step oxygen blast adds the purpose of anthracite carburant primarily to as in reducing agent reducing chrome ore after terminating
Chromium, oxygen blast terminate after add be in order to prevent reducing agent largely with oxygen reaction weaken reduction effect；Strong bottom blowing in addition is stirred
The effect mixed may additionally facilitate the oxygen and part anthracite carburant in molten steel in the stove in addition to chromium reduction reaction between improving slag-steel
React to provide heat in stove, reach the effect of thermal compensation.
Cr in chrome ore of the present invention2O3Content is not less than 40wt%.
Specific embodiment of the invention is further described with reference to embodiment, is not therefore limited the present invention
System is among described scope of embodiments.
Embodiment 1
Certain factory 120t converters use DIRECT ALLOYING technique in semi-steel making and chrome ore stove, after half steel is blended into converter, no
Plus steel scrap, rifle oxygen blast is directly descended, to addition active lime 10kg/t steel, dolomitic lime 13kg/t in stove while lower rifle oxygen blast
Steel, acid composite fluxing medium 10kg/t steel, oxygen lance position is 2~2.4m, and top blast oxygen oxygen supply intensity is 2m3/ mint steel, bottom
Nitrogen blowing, Nitrogen offerings intensity is 0.1m3/ mint steel, stops oxygen blast, and add anthracite carburant 1kg/t after steel oxygen blast 7min
Steel, the deslagging of falling stove, bottom blowing gas intensity is 0.02m during deslagging3/ mint steel, outwell carry out after rich phosphorus slag secondary slag making and
Chrome ore is reduced directly.Active lime 5kg/t steel, dolomitic lime 10kg/t steel are added during secondary slag making, and adds Antaciron to carry
Temperature simultaneously controls basicity of slag between 2~2.5.Lower rifle oxygen blast, control of lance position is in 1.3~1.6m, top blast oxygen supply intensity
3m3/ mint steel；Bottom blowing nitrogen, Nitrogen offerings intensity is 0.04m3/ mint, adds chrome ore 15kg/t steel after oxygen blast 2min, continue
Stop oxygen blast after oxygen blast 3min, add anthracite carburant 4kg/t steel, argon bottom-blowing, and improve bottom blowing gas intensity and arrive
0.15m3/ mint steel, taps after stirring 5min.
By the way that after above state modulator, converter tapping dephosphorization rate reaches 92%, the percent reduction of chromium reaches 91% in chrome ore.
Embodiment 2
Certain factory 120t converters use DIRECT ALLOYING technique in semi-steel making and chrome ore stove, after half steel is blended into converter, no
Plus steel scrap, rifle oxygen blast is directly descended, to addition active lime 15kg/t steel in stove while lower rifle oxygen blast, dolomitic lime 8kg/t steel,
Acid composite fluxing medium 6kg/t steel, oxygen lance position is 2.2~2.6m, and top blast oxygen oxygen supply intensity is 3m3/ mint steel, bottom blowing
Nitrogen, Nitrogen offerings intensity is 0.2m3/ mint steel, stops oxygen blast after steel oxygen blast 8min, and adds anthracite carburant 3kg/t steel,
The deslagging of falling stove；Bottom blowing gas intensity is 0.04m during deslagging3/ mint steel, secondary slag making and chrome ore are carried out after outwelling rich phosphorus slag
Direct-reduction.Active lime 10kg/t steel is added during secondary slag making, dolomitic lime addition is 5kg/t steel, while adding ferrosilicon
Alloy temperature raising simultaneously controls basicity of slag between 2.5~3.Lower rifle oxygen blast, control of lance position is in 1.5~1.9m, top blast oxygen supply
Intensity is 4m3/mint steel；Bottom blowing nitrogen, Nitrogen offerings intensity is 0.08m3/ mint steel, adds chrome ore 25kg/ after oxygen blast 3min
T steel, oxygen blast is stopped after continuing oxygen blast 5min, and adds anthracite carburant 8kg/t steel, argon bottom-blowing, and now bottom blowing gas are strong
Degree brings up to 0.35m3/ mint steel, taps after stirring 8min.
By the way that after above state modulator, converter tapping dephosphorization rate reaches 91%, the percent reduction of chromium reaches 92% in chrome ore.
Embodiment 3
Certain factory 200t converters use DIRECT ALLOYING technique in semi-steel making and chrome ore stove, after half steel is blended into converter, no
Plus steel scrap, rifle oxygen blast is directly descended, to addition active lime 12kg/t steel in stove while lower rifle oxygen blast, dolomitic lime 9kg/t steel,
Acid composite fluxing medium 8kg/t steel, oxygen lance position is 2.4~2.6m, and top blast oxygen oxygen supply intensity is 2.5m3/ mint steel, bottom
Nitrogen blowing, Nitrogen offerings intensity is 0.15m3/ mint steel, stops oxygen blast, and add anthracite carburant after steel oxygen blast 7.5min
2kg/t steel, the deslagging of falling stove, bottom blowing gas intensity is 0.03m during deslagging3/ mint steel, secondary making is carried out after outwelling rich phosphorus slag
Slag and chrome ore are reduced directly.Active lime 8kg/t steel is added during secondary slag making, dolomitic lime addition is 6kg/t steel, while plus
Enter Antaciron temperature raising and control basicity of slag between 2~2.6.Lower rifle oxygen blast, control of lance position is in 1.3~1.8m, top
Oxygen supply intensity is blown for 3.5m3/ mint steel；Bottom blowing nitrogen, Nitrogen offerings intensity is 0.06m3/ mint steel, adds after oxygen blast 2.5min
Chrome ore 20kg/t steel, is stirred using oxygen rifle oxygen jet, stops oxygen blast after continuing oxygen blast 4min, and add anthracite carburant
6kg/t steel, argon bottom-blowing, now bottom blowing gas intensity bring up to 0.25m3/ mint steel, taps after stirring 7min.
By the way that after above state modulator, converter tapping dephosphorization rate reaches 92%, the percent reduction of chromium reaches 93% in chrome ore.
Claims (9)
1. in semi-steel making Converter chrome ore DIRECT ALLOYING method, it is characterised in that comprise the following steps：
A, a slag making：After half steel is blended into converter, steel scrap is not added with, direct top blast oxygen, while to adding active lime in stove
10~15kg/t steel, dolomitic lime 8~13kg/t steel, acid 6~10kg/t of composite fluxing medium steel stops after 7~8min of oxygen blast
Oxygen blast, adds anthracite carburant 1~3kg/t steel, the deslagging of falling stove；
B, secondary slag making and the reduction of chrome ore：After deslagging, active lime 5~10kg/t steel, 5~10kg/t of dolomitic lime are added
Steel, while add Antaciron and control basicity of slag 2~3, top blast oxygen, added after 2~3min of oxygen blast chrome ore 15~
25kg/t steel, oxygen blast is stopped after continuing 3~5min of oxygen blast, adds anthracite carburant 4~8kg/t steel, is gone out after 5~8min of stirring
Steel；
In a steps, to deslagging since oxygen blast, bottom blowing nitrogen, Nitrogen offerings intensity is 0.1~0.2m3/ mint steel, bottom blowing during deslagging
Nitrogen, Nitrogen offerings intensity is 0.02~0.04m3/ mint steel；
In b step, oxygen blast starts to oxygen blast to terminate, bottom blowing nitrogen, and Nitrogen offerings intensity is 0.04~0.08m3/ mint steel；Add nothing
After bituminous coal carburant, argon bottom-blowing, air supply intensity is 0.15~0.35m3/ mint steel, taps after 5~8min of stirring.
2. in semi-steel making Converter according to claim 1 chrome ore DIRECT ALLOYING method, it is characterised in that：A is walked
In rapid, the oxygen supply intensity of top blast oxygen is 2~3m3/ mint steel, in b step, the oxygen supply intensity of top blast oxygen is 3~4m3/
Mint steel.
3. in semi-steel making Converter according to claim 1 and 2 chrome ore DIRECT ALLOYING method, it is characterised in that：a
In step, oxygen lance position is 2~2.6m, and in b step, oxygen lance position is 1.3~1.9m.
4. in semi-steel making Converter according to claim 1 and 2 chrome ore DIRECT ALLOYING method, it is characterised in that：b
In step, after adding chrome ore, oxygen blast is stopped after stirring 3~5min using oxygen rifle oxygen jet, add anthracite carburant, bottom blowing
5~8min of stirring and then tapping.
5. in semi-steel making Converter according to claim 3 chrome ore DIRECT ALLOYING method, it is characterised in that：B is walked
In rapid, after adding chrome ore, oxygen blast is stopped after stirring 3~5min using oxygen rifle oxygen jet, add anthracite carburant, bottom blowing is stirred
Mix 5~8min and then tap.
6. in semi-steel making Converter according to claim 1 and 2 chrome ore DIRECT ALLOYING method, it is characterised in that：
Cr in the chrome ore2O3Content is not less than 40wt%.
7. in semi-steel making Converter according to claim 3 chrome ore DIRECT ALLOYING method, it is characterised in that：It is described
Cr in chrome ore2O3Content is not less than 40wt%.
8. in semi-steel making Converter according to claim 4 chrome ore DIRECT ALLOYING method, it is characterised in that：It is described
Cr in chrome ore2O3Content is not less than 40wt%.
9. in semi-steel making Converter according to claim 5 chrome ore DIRECT ALLOYING method, it is characterised in that：It is described
Cr in chrome ore2O3Content is not less than 40wt%.
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| CN106498115B (en) * | 2017-01-12 | 2018-05-08 | 青岛特殊钢铁有限公司 | A kind of method of chrome-bearing alloy steel converter tapping control Ti contents |
| CN110527786B (en) * | 2019-10-10 | 2021-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for directly alloying and steelmaking by using manganese ore in converter |
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| JPS61166910A (en) * | 1985-01-18 | 1986-07-28 | Nippon Steel Corp | Production of chromium-containing alloy |
| CN1043061C (en) * | 1995-09-27 | 1999-04-21 | 上海第五钢铁厂 | Method for directly smelting stainless steel by chromium ore fusion reduction |
| CN103540705A (en) * | 2013-10-30 | 2014-01-29 | 承德建龙特殊钢有限公司 | Method for adding metal chromium in converter steelmaking process |
| CN103911479B (en) * | 2014-04-22 | 2016-01-20 | 武汉钢铁(集团)公司 | The method of chrome ore direct Reducing and Alloying in 90t top and bottom combined blown converter |
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