CN105483316B - The method of chrome ore DIRECT ALLOYING in Converter - Google Patents
The method of chrome ore DIRECT ALLOYING in Converter Download PDFInfo
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- CN105483316B CN105483316B CN201610033863.8A CN201610033863A CN105483316B CN 105483316 B CN105483316 B CN 105483316B CN 201610033863 A CN201610033863 A CN 201610033863A CN 105483316 B CN105483316 B CN 105483316B
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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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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to the method for chrome ore DIRECT ALLOYING in Converter, belong to metallurgical technology field.Present invention solves the technical problem that being to provide the method for chrome ore DIRECT ALLOYING in Converter, this method passes through the control to slagging regime, bottom blowing gas system, oxygen supply system and chrome ore addition system, realize the purpose of Dephosphorization steel-making and chrome ore DIRECT ALLOYING in stove, high, the characteristics of chromium recovery rate is high with dephosphorization rate.The method of chrome ore DIRECT ALLOYING in the Converter that the present invention is provided, while with preferable dephosphorization effect, the rate of recovery of chromium can reach more than 90% in chrome ore.
Description
Technical field
The present invention relates to the method for chrome ore DIRECT ALLOYING in 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 which more stainless, interior heat, the steel of high intensity, the consumption of evanohm are also rapid
Increase.And when producing these stainless, interior heat, steel products of high intensity, 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.In smelting using primary raw materials melting directly also
The expensive ferroalloy of original substitution, is reduction steel-making cost, saves one of approach of the energy.Therefore, using chrome ore DIRECT ALLOYING
Steelmaking alloy cost can be greatly lowered by substituting (high-carbon, low-carbon) ferrochrome.But electric furnace is directly added into using chrome ore or turned
It is low to there is recovery rate in stove, the problems such as technological parameter is difficult to control to.
The method that patent CN103911479A discloses chrome ore direct Reducing and Alloying in a kind of 90t top and bottom combined blown converters.
This 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 finally obtained, 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.
Patent CN103540705A discloses a kind of method that crome metal is added in 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 the chromium in chromite ore fine to add crome metal in molten steel into converter.Because converter is
Oxidizing atmosphere, chromite ore fine adds after-blow oxygen with slag former to influence the reduction effect of chrome ore, reduces its recovery rate,
Make chrome ore utilization rate not high.
The content of the invention
Present invention solves the technical problem that being to provide the method for chrome ore DIRECT ALLOYING in Converter, this method can realize stove
Interior Dephosphorization steel-making and the purpose of chrome ore DIRECT ALLOYING, chromium recovery rate high the characteristics of high with dephosphorization rate.
The method of chrome ore DIRECT ALLOYING, comprises the following steps in Converter of the present invention：
A, a slag making：Molten iron is blended into converter, starts to add active lime 10~15kg/t steel after oxygen blast into stove, it is high
Magnesium lime 8~13kg/t steel, slag former 6~10kg/t steel, clinker is outwelled when oxygen blast progress reaches 85%；
B, secondary slag making：Active lime 5~10kg/t steel, dolomitic lime 5~10kg/t steel are added, and adds slag former control
Basicity of slag processed is 2~3, then adds chrome ore DIRECT ALLOYING ball 15~25kg/t steel；
Top blast oxygen supply and bottom blowing gas are used in smelting process, until smelting endpoint；Wherein, oxygen is used after secondary slag making
Rifle 60~90s of nitrogen flushing, no longer oxygen blast after oxygen rifle nitrogen flushing.
Wherein, the bottom blowing gas are：When oxygen blast progress is 0~30%, bottom blowing supplies nitrogen, and intensity is 0.08~
0.15m3/ mint steel, during oxygen blast progress 31%~85%, bottom blowing supplies nitrogen, and intensity is 0.02~0.04m3/ mint steel, blows
Oxygen progress 85% is to tapping, and bottom blowing supplies argon gas, and intensity is 0.15~0.25m3/ mint steel.
Further, the top blast oxygen supply is：Oxygen blast progress 0~30%, oxygen supply intensity is 2~3m3/ mint steel；Blow
Oxygen progress 31%~85%, oxygen supply intensity is 3~4.5m3/ mint steel；Oxygen rifle 60~90s of nitrogen flushing is used after secondary slag making, is supplied
Nitrogen intensity is 3~3.5m3/ mint steel；Control of lance position is 1.3~1.5m.
Further, the chrome ore DIRECT ALLOYING ball is adopted prepares with the following method：Chromite ore fine and reducing agent are mixed
Even and pressure ball or briquetting, drying, Control granularity is 30~60mm.
Wherein, the chrome ore DIRECT ALLOYING ball is directly added into Converter by high hopper.
The method of chrome ore DIRECT ALLOYING in Converter of the present invention, by slagging regime, bottom blowing gas system, oxygen supply system
Degree and chrome ore add the control of system, the purpose of Dephosphorization steel-making and chrome ore DIRECT ALLOYING in stove are realized, with dephosphorization
Rate is high, the characteristics of chromium recovery rate is high.
The method of chrome ore DIRECT ALLOYING in the Converter that the present invention is provided, while with preferable dephosphorization effect, chromium
The rate of recovery of chromium can reach more than 90% in ore deposit.
Embodiment
The method of chrome ore DIRECT ALLOYING, comprises the following steps in Converter of the present invention：
A, a slag making：Molten iron is blended into converter, starts to add active lime 10~15kg/t steel after oxygen blast into stove, it is high
Magnesium lime 8~13kg/t steel, slag former 6~10kg/t steel, clinker is outwelled when oxygen blast progress reaches 85%；
B, secondary slag making：Active lime 5~10kg/t steel, dolomitic lime 5~10kg/t steel are added during secondary slag making, and is added
Entering slag former controls basicity of slag to be 2~3, adds chrome ore DIRECT ALLOYING ball 15~25kg/t steel,
Top blast oxygen supply and bottom blowing gas, oxygen rifle no longer oxygen blast after secondary slag making, using oxygen are used in whole smelting process
Rifle 60~90s of nitrogen flushing, is stirred by force using bottom blowing until smelting endpoint.
Wherein, active lime and dolomitic lime commonly use auxiliary material for 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.Make
Slag agent is the conventional auxiliary material of steel-making, and the conventional slag former in this area is applied to the present invention.
Basicity of slag of the present invention is CaO/SiO in slag2Ratio.
Wherein, the bottom blowing gas are：When oxygen blast progress is 0~30% (i.e. initial smelting period), bottom blowing supplies nitrogen, and intensity is
0.08~0.15m3/ mint steel, during oxygen blast progress 31%~secondary slag making (smelting mid-term), bottom blowing supplies nitrogen, and intensity is
0.02~0.04m3/ mint steel, secondary slag making to tapping (smelting the later stage), bottom blowing supplies argon gas, and intensity is 0.15~
0.25m3/ mint steel.
The method of chrome ore DIRECT ALLOYING in Converter of the present invention, top blast oxygen supply, oxygen supply system is：Oxygen blast progress 0~
30% (i.e. initial smelting period) oxygen supply intensity is 2~3m3/ mint steel, oxygen blast progress 31%~85% (smelts mid-term), oxygen supply
Intensity is 3~4.5m3/ mint steel, uses oxygen rifle 60~90s of nitrogen flushing after secondary slag making, Nitrogen offerings intensity is 3~3.5m3/min·
T steel, rifle position is controlled between 1.3~1.5m, strengthens melting bath stirring.
Chrome ore DIRECT ALLOYING ball of the present invention is adopted to be prepared with the following method：Chromite ore fine and reducing agent are mixed simultaneously
Pressure ball or briquetting, drying, Control granularity is 30~60mm.
Wherein, described reducing agent is reduction agent material commonly used in the art, in such as carbon dust, ferrosilicon powder, aluminum shot at least
It is a kind of.
The chrome ore DIRECT ALLOYING ball is directly added into Converter by high hopper.
The method of chrome ore DIRECT ALLOYING in Converter of the present invention, by slagging regime, bottom blowing gas system, oxygen supply system
Degree and chrome ore add the control of system, the purpose of Dephosphorization steel-making and chrome ore DIRECT ALLOYING in stove are realized, with dephosphorization
Rate is high, the characteristics of chromium recovery rate is high.
The embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit
System is among described scope of embodiments.
Embodiment 1
The 120t converters of certain factory are blended into after molten iron using DIRECT ALLOYING technique in chrome ore stove, are started oxygen blast and are added into stove
Enter active lime 10kg/t steel, dolomitic lime 13kg/t steel, slag former 10kg/t steel outwells stove when oxygen blast progress reaches 85%
Slag, secondary slag making.Active lime addition is 5kg/t steel during secondary slag making, and dolomitic lime addition is 10kg/t steel, and is added
Slag former controls basicity of slag 2.Chrome ore DIRECT ALLOYING ball (granularity is 30mm) ton steel 15kg is added after secondary slag making, and is adopted
Oxygen rifle nitrogen flushing is used, while using strong bottom blowing gas intensity, until smelting endpoint.
Smelting process bottom blowing gas intensity is：Initial smelting period (oxygen blast progress 0~30%) bottom blowing supplies nitrogen, and intensity is
0.08m3/ mint steel, smelts mid-term (oxygen blast progress 31%~secondary slag making), bottom blowing supplies nitrogen, and intensity is 0.02m3/min·
T steel, smelts the later stage (secondary slag making to tapping), bottom blowing supplies argon gas, and intensity is 0.15m3/ mint steel.
Smelting process oxygen supply system is：Initial smelting period (oxygen blast progress 0~30%) oxygen supply intensity is 2m3/ mint steel, smelting
Mid-term (oxygen blast progress 31%~85%) is refined, oxygen supply intensity is 3m3/ mint steel, uses oxygen rifle nitrogen flushing 60s after secondary slag making,
Nitrogen offerings intensity is 3m3/ mint steel, rifle position is controlled between 1.3~1.4m, strengthens melting bath stirring.
After above state modulator, dephosphorization rate reaches 92% during converter tapping, and chromium percent reduction is 91%.
Embodiment 2
The 120t converters of certain factory are blended into after molten iron using DIRECT ALLOYING technique in chrome ore stove, are started oxygen blast and are added into stove
Enter active lime 12kg/t steel, dolomitic lime 10kg/t steel, slag former 9kg/t steel outwells stove when oxygen blast progress reaches 85%
Slag, secondary slag making.Active lime addition is 8kg/t steel during secondary slag making, and dolomitic lime addition is 8kg/t steel, and is added
Slag former controls basicity of slag 2.5.Chrome ore DIRECT ALLOYING block (granularity is 60mm) ton steel 20kg is added after secondary slag making, and
Using oxygen rifle nitrogen flushing, while using strong bottom blowing gas intensity, until smelting endpoint.
Smelting process bottom blowing gas intensity is：Initial smelting period (oxygen blast progress 0~30%) bottom blowing supplies nitrogen, and intensity is
0.10m3/ mint steel, smelts mid-term (oxygen blast progress 31%~secondary slag making), bottom blowing supplies nitrogen, and intensity is 0.03m3/min·
T steel, smelts the later stage (secondary slag making to tapping), bottom blowing supplies argon gas, and intensity is 0.2m3/ mint steel.
Smelting process oxygen supply system is：Initial smelting period (oxygen blast progress 0~30%) oxygen supply intensity is 2.5m3/ mint steel,
Mid-term (oxygen blast progress 31%~85%) is smelted, oxygen supply intensity is 3.5m3/ mint steel, uses oxygen rifle nitrogen flushing after secondary slag making
80s, Nitrogen offerings intensity is 3.2m3/ mint steel, rifle position is controlled between 1.4~1.5m, strengthens melting bath stirring.
After above state modulator, dephosphorization rate reaches 94% during converter tapping, and chromium percent reduction is 92%.
Embodiment 3
The 120t converters of certain factory are blended into after molten iron using DIRECT ALLOYING technique in chrome ore stove, are started oxygen blast and are added into stove
Enter active lime 15kg/t steel, dolomitic lime 8kg/t steel, slag former 10kg/t steel) outwell stove when oxygen blast progress reaches 85%
Slag, secondary slag making.Active lime addition is 10kg/t steel during secondary slag making, and dolomitic lime addition is 5kg/t steel, and is added
Slag former controls basicity of slag 3.Chrome ore DIRECT ALLOYING ball (or block, granularity is 50mm) ton steel is added after secondary slag making
25kg, and oxygen rifle nitrogen flushing is used, while using strong bottom blowing gas intensity, until smelting endpoint.
Smelting process bottom blowing gas intensity is：Initial smelting period (oxygen blast progress 0~30%) bottom blowing supplies nitrogen, and intensity is
0.15m3/ mint steel, smelts mid-term (oxygen blast progress 31%~secondary slag making), bottom blowing supplies nitrogen, and intensity is 0.04m3/min·
T steel, smelts the later stage (secondary slag making to tapping), bottom blowing supplies argon gas, and intensity is 0.25m3/ mint steel.
Smelting process oxygen supply system is：Initial smelting period (oxygen blast progress 0~30%) oxygen supply intensity is 3m3/ mint steel, smelting
Mid-term (oxygen blast progress 31%~85%) is refined, oxygen supply intensity is 4.5m3/ mint steel, uses oxygen rifle nitrogen flushing after secondary slag making
90s, Nitrogen offerings intensity is 3.5m3/ mint steel, rifle position is controlled between 1.4~1.5m, strengthens melting bath stirring.
After above state modulator, dephosphorization rate reaches 94% during converter tapping, and chromium percent reduction is 93%.
Claims (3)
1. the method for chrome ore DIRECT ALLOYING in Converter, it is characterised in that comprise the following steps：
A, a slag making：Molten iron is blended into converter, starts to add active lime 10~15kg/t steel, high magnesite after oxygen blast into stove
Ash 8~13kg/t steel, slag former 6~10kg/t steel outwells clinker when oxygen blast progress reaches 85%；
B, secondary slag making：Active lime 5~10kg/t steel, dolomitic lime 5~10kg/t steel are added, and adds slag former control stove
Basicity of slag is 2~3, then adds chrome ore DIRECT ALLOYING ball 15~25kg/t steel；
Top blast oxygen supply and bottom blowing gas are used in smelting process, until smelting endpoint；Wherein, blown after secondary slag making using oxygen rifle
60~90s of nitrogen, no longer oxygen blast after oxygen rifle nitrogen flushing；
The bottom blowing gas are：When oxygen blast progress is 0~30%, bottom blowing supplies nitrogen, and intensity is 0.08~0.15m3/ mint steel,
During oxygen blast progress 31%~85%, bottom blowing supplies nitrogen, and intensity is 0.02~0.04m3/ mint steel, oxygen blast progress 85% is to going out
Steel, bottom blowing supplies argon gas, and intensity is 0.15~0.25m3/ mint steel；
The top blast oxygen supply is：Oxygen blast progress 0~30%, oxygen supply intensity is 2~3m3/ mint steel；Oxygen blast progress 31%~
85%, oxygen supply intensity is 3~4.5m3/ mint steel；After secondary slag making use oxygen rifle 60~90s of nitrogen flushing, Nitrogen offerings intensity be 3~
3.5m3/ mint steel；Control of lance position is 1.3~1.5m.
2. the method for chrome ore DIRECT ALLOYING in Converter according to claim 1, it is characterised in that：The chrome ore is direct
Alloying ball is adopted to be prepared with the following method：Chromite ore fine and reducing agent are mixed and pressure ball or briquetting, drying, Control granularity is
30~60mm.
3. the method for chrome ore DIRECT ALLOYING in Converter according to claim 2, it is characterised in that：The chrome ore is direct
Alloying ball is directly added into Converter by high hopper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610033863.8A CN105483316B (en) | 2016-01-19 | 2016-01-19 | The method of chrome ore DIRECT ALLOYING in Converter |
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| CN201610033863.8A CN105483316B (en) | 2016-01-19 | 2016-01-19 | The method of chrome ore DIRECT ALLOYING in Converter |
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| CN105483316B true CN105483316B (en) | 2017-08-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115323097A (en) * | 2022-05-12 | 2022-11-11 | 北京科技大学 | Method for increasing dissolution amount of chromium in molten slag in chromium ore smelting reduction process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165540A (en) * | 1995-09-28 | 1997-11-19 | 川崎制铁株式会社 | Chromium ore smelting redution process |
| CN101570805A (en) * | 2009-06-10 | 2009-11-04 | 北京北科中钢工程技术有限公司 | Method for producing low alloy steel containing manganese and chromium by using dephosphorized molten iron, manganese ores and chromium ores |
| CN103911479A (en) * | 2014-04-22 | 2014-07-09 | 武汉钢铁(集团)公司 | Method for directly reducing and alloying chromium ore in 90t top-bottom combined blowing converter |
-
2016
- 2016-01-19 CN CN201610033863.8A patent/CN105483316B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165540A (en) * | 1995-09-28 | 1997-11-19 | 川崎制铁株式会社 | Chromium ore smelting redution process |
| CN101570805A (en) * | 2009-06-10 | 2009-11-04 | 北京北科中钢工程技术有限公司 | Method for producing low alloy steel containing manganese and chromium by using dephosphorized molten iron, manganese ores and chromium ores |
| CN103911479A (en) * | 2014-04-22 | 2014-07-09 | 武汉钢铁(集团)公司 | Method for directly reducing and alloying chromium ore in 90t top-bottom combined blowing converter |
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