CN108315524A - A method of reducing semi-steel making supplementary product onsumption - Google Patents
A method of reducing semi-steel making supplementary product onsumption Download PDFInfo
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- CN108315524A CN108315524A CN201810177350.3A CN201810177350A CN108315524A CN 108315524 A CN108315524 A CN 108315524A CN 201810177350 A CN201810177350 A CN 201810177350A CN 108315524 A CN108315524 A CN 108315524A
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- steel
- supplementary product
- slag
- product onsumption
- converter
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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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of methods reducing semi-steel making supplementary product onsumption, belong to metallurgical technology field.The present invention provides a kind of method reducing semi-steel making supplementary product onsumption in order to which long the time required to solving current semi-steel making formation initial stage slag, dephosphorization rate are low and the technical problems such as supplementary product onsumption is larger, including：It after converter is blended into half steel, opens and active lime, dolomitic lime, acid composite fluxing medium and converter castaway slag is added while blowing into stove, control oxygen lance position and oxygen blast intensity, control terminal basicity of slag is 3~4, obtains qualified endpoint molten steel.The present invention provides addition and discards converter terminal slag replacement partial metallurgical auxiliary material, significantly reduces supplementary product onsumption；By adjusting steel-making condition, semi-steel making is also made to have the advantages that slugging is made, slagging speed is fast, dephosphorization rate is high；It realizes the high efficiente callback of irony resource and makes steel the green circulatory of solid waste resource recovery.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a method of reducing semi-steel making supplementary product onsumption.
Background technology
China is vanadium titano-magnetite big country, possesses abundant v-ti magnetite ore resources, and the country climbs steel, holds steel, elder brother's steel, prestige steel
Equal iron and steel enterprises are smelted using vanadium titano-magnetite, and pneumatic steelmaking main material is using after special vanadium extraction by converter blowing
Half steel, carbon mass percentage is 3.4%~4.0% in the half steel that vanadium-bearing hot metal obtains after desulfurization vanadium extraction, silicon, manganese in half steel
Fever slagging constituent content is trace, and half steel phosphorus mass percentage is 0.060%~0.080%, therefore semisteel smelting has
There is in converting process the features such as acid slagging substance is few, slag system constituent element is single and shortage of heat.Therefore, semi-steel making condition
Long the time required to lower formation initial stage slag, dephosphorization rate is low and supplementary product onsumption is larger, is difficult to effectively solve these problems at present.
Invention content
For deficiencies of the prior art, the present invention provides whole using discarded converter is added in smelting process
Method of the point slag to substitute partial metallurgical auxiliary material, so that semi-steel making is had, slagging speed is fast, dephosphorization rate is high, and supplementary product onsumption is low
Advantage.
A method of semi-steel making supplementary product onsumption being reduced, this approach includes the following steps：
After converter is blended into half steel, opens and active lime, dolomitic lime and acid composite fluxing medium is added while blowing into stove,
And converter castaway slag is added, control oxygen lance position is 1.4~2m, and when oxygen blast progress is 0~40%, oxygen supply by lance intensity is 2.5
~3.0m3/ (t steel min), oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5~4.5m3/ (t steel min), control
Terminal basicity of slag processed is 3~4, and finishing blowing obtains endpoint molten steel.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the dosage of the active lime is 10~
14kg/t steel.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, CaO mass contents in the active lime
It is 85~90%.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the dosage of the dolomitic lime is 10~
14kg/t steel.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, CaO mass contents in the dolomitic lime
It is 30~40% for 48~55%, MgO mass contents.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the dosage of the acidity composite fluxing medium
For 6~9kg/t steel.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the acidity composite fluxing medium is ferrosilicon；
The chemical conversion ingredient of the acidity composite fluxing medium is SiO by percentage to the quality2：48%, MgO：10%, CaO：12%, TFe：
20%, MnO：8%, Al2O3：2% and inevitable impurity.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the dosage of the converter castaway slag is 6~
9kg/t steel.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the chemical conversion ingredient of the converter castaway slag
It is FeO by percentage to the quality：18~23%, Fe2O3：8~12%, MFe：5~10%, CaO：35~43%, SiO2：10~
15%, Al2O3：1~3%, MnO：1~2%, MgO：10~15%, P：0.8-1.3%, S：0.02-0.05%, moisture are less than
1% and inevitable impurity.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, the oxygen lance position is that 1.4~2m is specific
For：It opens and blows rifle position for 2m, blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m.
Wherein, in the method for reduction semi-steel making supplementary product onsumption described above, phosphorus mass content in the endpoint molten steel
It is 0.006~0.009%.
The beneficial effects of the invention are as follows：
The present invention adds discarded converter terminal slag during semi-steel making, to substitute partial metallurgical auxiliary material, significantly drops
Low supplementary product onsumption；By adjusting steel-making condition, semi-steel making is also set to have that slugging is made, slagging speed is fast, dephosphorization rate is high excellent
Point；The method of the present invention realizes the high efficiente callback of irony resource and the comprehensive utilization of discarded tailings, reaches zero-emission, realizes steel-making
The green circulatory of solid waste resource recovery.
Specific implementation mode
Specifically, a kind of method reducing semi-steel making supplementary product onsumption, includes the following steps：
After converter is blended into half steel, opens and active lime, dolomitic lime and acid composite fluxing medium is added while blowing into stove,
And converter castaway slag is added, control oxygen lance position is 1.4~2m, and when oxygen blast progress is 0~40%, oxygen supply by lance intensity is 2.5
~3.0m3/ (t steel min), oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5~4.5m3/ (t steel min), control
Terminal basicity of slag processed is 3~4, and finishing blowing obtains endpoint molten steel.
Steelmaking ingredient is active lime, dolomitic lime and acid composite fluxing medium in the present invention.
Inventor controls the addition of each material according to experiment and practice result：The dosage of active lime be 10~
The dosage of 14kg/t steel, dolomitic lime is 10~14kg/t steel, and the dosage of acid composite fluxing medium is 6~9kg/t steel, and converter is useless
The dosage of waste is 6~9kg/t steel, realizes and substitutes partial metallurgical auxiliary material with discarded converter terminal slag, and does not influence to smelt
Effect.
In the method for the present invention, CaO mass contents are 85~90% in the active lime；CaO matter in the dolomitic lime
It is 30~40% that amount content, which is 48~55%, MgO mass contents,；The acidity composite fluxing medium is ferrosilicon；The acidity is compound
The chemical conversion ingredient of slag former is SiO by percentage to the quality2：48%, MgO：10%, CaO：12%, TFe：20%, MnO：8%,
Al2O3：2% and inevitable impurity.
In the method for the present invention, converter castaway slag, that is, converter smelting endpoint slag can be used to refine through broken and simple screening
The chemical conversion ingredient of steel, converter castaway slag is FeO by percentage to the quality：18~23%, Fe2O3：8~12%, MFe：5~10%,
CaO：35~43%, SiO2：10~15%, Al2O3：1~3%, MnO：1~2%, MgO：10~15%, P：0.8-1.3%, S：
0.02-0.05%, moisture are less than 1% and inevitable impurity.The basicity and ingredient of converter castaway slag and converter semi-steel making
Slag phase it is close, and contain a large amount of ferrous oxide and iron oxide in castaway slag, oxidisability is high, and slagging course, dephosphorizing process need
High oxidative can reach the effect that slagging speed is fast, dephosphorization rate is high, and by adjusting smelting parameter makes it not and influence half steel refining
Steel.
It is 1.4~2m that oxygen lance position is controlled in the method for the present invention, and more specifically control, which is opened, blows rifle position for 2m, prevents from burning rifle,
Blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m, by ensure that slag has flowing well to the regulation and control of rifle position
Property, with early slugging, more dephosphorizations and protect furnace lining.When oxygen blast progress (i.e. converting process) is 0~40%, oxygen supply by lance intensity is
2.5~3.0m3/ (t steel min), oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5~4.5m3/ (t steel min),
The oxygen supply intensity for controlling different oxygen blast progresses is conducive to smelting slag making and heating decarburization, and control terminal basicity of slag is 3~4,
Be conducive to dephosphorization, while controlling the oxygen supply intensity and the avoidable addition converter castaway slag pair of terminal basicity of slag of different oxygen blast progresses
The influence of semi-steel making reaches terminal and needs the level requirement controlled, obtains qualified endpoint molten steel.
Converter castaway slag is added in the method for the present invention and replaces partial metallurgical auxiliary material, therefore inventor carries out steel-making condition
A large amount of trials, not only reduce supplementary product onsumption, also make that the slugging time of semi-steel making is early, slagging speed is fast, more realize height
Dephosphorization rate, phosphorus mass content is 0.006~0.009% in obtained endpoint molten steel.
In the present invention, the rifle position refers to distance of the oxygen lance nozzle end to bath surface.
Below by embodiment, invention is further described in detail, but does not therefore limit the scope of the present invention
Among the embodiment described range.
Embodiment 1
140t converter smeltings after converter is blended into half steel, is opened and active lime 12kg/t steel, Gao Mei are added while blowing into stove
Lime 12kg and acid composite fluxing medium (ferrosilicon) 6kg/t steel, and converter castaway slag 6kg/t steel is added, oxygen lance nozzle is away from molten bath
The basic rifle position of metal bath surface is 1.4~2m, opens and blows rifle position for 2m, and blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m；It blows
When oxygen progress is 0~40%, oxygen supply by lance intensity is 2.5~3.0m3/ (t steel min), oxygen blast progress are tied for 40% to blowing
Beam oxygen supply intensity is 3.5~4.5m3/ (t steel min), control terminal basicity of slag is 3~4, and finishing blowing obtains terminal steel
Water, phosphorus mass content is 0.008% in endpoint molten steel.
Embodiment 2
140t converter smeltings after converter is blended into half steel, is opened and active lime 13kg/t steel, Gao Mei are added while blowing into stove
Lime 13kg and acid composite fluxing medium (ferrosilicon) 7kg/t steel, and converter castaway slag 7kg/t steel is added, oxygen lance nozzle is away from molten bath
The basic rifle position of metal bath surface is 1.4~2m, opens and blows rifle position for 2m, and blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m；It blows
When oxygen progress is 0~40%, oxygen supply by lance intensity is 2.5~3.0m3/ (t steel min), oxygen blast progress are tied for 40% to blowing
Beam oxygen supply intensity is 3.5~4.5m3/ (t steel min), control terminal basicity of slag is 3~4, and finishing blowing obtains terminal steel
Water, phosphorus mass content is 0.008% in endpoint molten steel.
Comparative example 1
140t converters use semi-steel making, after converter is blended into half steel, opens and active lime 21kg/ is added while blowing into stove
T steel, dolomitic lime 21kg and acid composite fluxing medium (ferrosilicon) 15kg/t steel, oxygen lance nozzle is away from the basic rifle position of molten pool metal liquid level
It for 1.4~2m, opens and blows rifle position for 2m, blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m；Oxygen blast progress is 0~40%
When, oxygen supply by lance intensity is 2.5~3.0m3/ (t steel min), oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5
~4.5m3/ (t steel min), control terminal basicity of slag are 3~4, and finishing blowing obtains endpoint molten steel, phosphorus in endpoint molten steel
Mass content is 0.008%.
By above-described embodiment and comparative example it is found that after substituting partial metallurgical auxiliary material using vessel slag, total auxiliary material reduces
16kg/t steel, remarkable benefit, while a kind of feasible realization means are provided for city type iron and steel enterprise, environmentally friendly businesses,
It realizes the high efficiente callback of irony resource and the comprehensive utilization of discarded tailings, reaches zero-emission, realize steel-making solid waste resource
The green circulatory of change.
Claims (7)
1. the method for reducing semi-steel making supplementary product onsumption, it is characterised in that：Include the following steps：
After converter is blended into half steel, opens and active lime, dolomitic lime and acid composite fluxing medium is added while blowing into stove, and add
Entering converter castaway slag, control oxygen lance position is 1.4~2m, when oxygen blast progress is 0~40%, oxygen supply by lance intensity is 2.5~
3.0m3/ (t steel min), oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5~4.5m3/ (t steel min), control
Terminal basicity of slag is 3~4, and finishing blowing obtains endpoint molten steel.
2. the method according to claim 1 for reducing semi-steel making supplementary product onsumption, it is characterised in that：The active lime
Dosage is 10~14kg/t steel；CaO mass contents are 85~90% in the active lime.
3. the method according to claim 1 for reducing semi-steel making supplementary product onsumption, it is characterised in that：The dolomitic lime
Dosage is 10~14kg/t steel；It is 30~40% that CaO mass contents, which are 48~55%, MgO mass contents, in the dolomitic lime.
4. the method according to claim 1 for reducing semi-steel making supplementary product onsumption, it is characterised in that：The acidity is compound to be made
The dosage of slag agent is 6~9kg/t steel；The acidity composite fluxing medium is ferrosilicon；The chemical conversion ingredient of the acidity composite fluxing medium
It is SiO by percentage to the quality2：48%, MgO：10%, CaO：12%, TFe：20%, MnO：8%, Al2O3：2%, and can not
The impurity avoided.
5. the method according to claim 1 for reducing semi-steel making supplementary product onsumption, it is characterised in that：The converter castaway slag
Dosage be 6~9kg/t steel；The chemical conversion ingredient of the converter castaway slag is FeO by percentage to the quality：18~23%, Fe2O3：
8~12%, MFe：5~10%, CaO：35~43%, SiO2：10~15%, Al2O3：1~3%, MnO：1~2%, MgO：10
~15%, P：0.8-1.3%, S：0.02-0.05%, moisture are less than 1% and inevitable impurity.
6. the method according to claim 1 for reducing semi-steel making supplementary product onsumption, it is characterised in that：The oxygen lance position is
1.4~2m is specially：It opens and blows rifle position for 2m, blowing rifle position is 1.4m~1.8m, and catch carbon rifle position is 1.4m.
7. the method for reducing semi-steel making supplementary product onsumption according to claim 1~6 any one of them, it is characterised in that：It is described
Phosphorus mass content is 0.006%~0.009% in endpoint molten steel.
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| CN201810177350.3A CN108315524A (en) | 2018-02-28 | 2018-02-28 | A method of reducing semi-steel making supplementary product onsumption |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551868A (en) * | 2019-10-16 | 2019-12-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing decarburization time of semisteel steelmaking converter |
| CN111961797A (en) * | 2020-09-16 | 2020-11-20 | 攀钢集团研究院有限公司 | Method for increasing CO content in semisteel steelmaking converter gas |
| CN113025773A (en) * | 2021-02-22 | 2021-06-25 | 河钢股份有限公司承德分公司 | Dephosphorization method for semisteel steelmaking |
| CN113073169A (en) * | 2021-03-25 | 2021-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for making steel by using dephosphorized steel slag |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1524969A (en) * | 2003-02-28 | 2004-09-01 | 宝山钢铁股份有限公司 | Melted iron dephosphorization agent using vessel slag as raw material |
| CN102312036A (en) * | 2010-07-06 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Steelmaking and slagging method |
| CN103290163A (en) * | 2013-06-05 | 2013-09-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel steelmaking method |
| CN103882178A (en) * | 2014-04-01 | 2014-06-25 | 首钢总公司 | Converter steelmaking process for recycling converter final slag |
| CN104789732A (en) * | 2015-05-20 | 2015-07-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for slagging in semisteel steelmaking converter |
| CN107151723A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the Semi-steel making method of slag entirely |
-
2018
- 2018-02-28 CN CN201810177350.3A patent/CN108315524A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1524969A (en) * | 2003-02-28 | 2004-09-01 | 宝山钢铁股份有限公司 | Melted iron dephosphorization agent using vessel slag as raw material |
| CN102312036A (en) * | 2010-07-06 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Steelmaking and slagging method |
| CN103290163A (en) * | 2013-06-05 | 2013-09-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel steelmaking method |
| CN103882178A (en) * | 2014-04-01 | 2014-06-25 | 首钢总公司 | Converter steelmaking process for recycling converter final slag |
| CN104789732A (en) * | 2015-05-20 | 2015-07-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for slagging in semisteel steelmaking converter |
| CN107151723A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the Semi-steel making method of slag entirely |
Non-Patent Citations (1)
| Title |
|---|
| V A 库德林: "《高等学校教学用书 炼钢学》", 31 May 1988, 冶金工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551868A (en) * | 2019-10-16 | 2019-12-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing decarburization time of semisteel steelmaking converter |
| CN111961797A (en) * | 2020-09-16 | 2020-11-20 | 攀钢集团研究院有限公司 | Method for increasing CO content in semisteel steelmaking converter gas |
| CN113025773A (en) * | 2021-02-22 | 2021-06-25 | 河钢股份有限公司承德分公司 | Dephosphorization method for semisteel steelmaking |
| CN113073169A (en) * | 2021-03-25 | 2021-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for making steel by using dephosphorized steel slag |
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Application publication date: 20180724 |