CN108441597A - A kind of cold conditions slag return semi-steel making converter renewable resources process for making - Google Patents
A kind of cold conditions slag return semi-steel making converter renewable resources process for making Download PDFInfo
- Publication number
- CN108441597A CN108441597A CN201810266668.9A CN201810266668A CN108441597A CN 108441597 A CN108441597 A CN 108441597A CN 201810266668 A CN201810266668 A CN 201810266668A CN 108441597 A CN108441597 A CN 108441597A
- Authority
- CN
- China
- Prior art keywords
- steel
- slag
- making
- cold conditions
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
Landscapes
- 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 cold conditions slags to return to semi-steel making converter renewable resources process for making, belongs to converter steeling technology field.The present invention is in order to make full use of cold conditions slag, to reduce the consumption of raw and auxiliary materials such as lime, Gao Mei, acid composite slag, steel-making cost is reduced, provides a kind of cold conditions slag return semi-steel making converter renewable resources process for making, including charging and oxygen furnace steel step, the charging includes：Half steel water, 0~80kg/t of steel scrap steel, cold conditions 6~14kg/t of slag steel, 12~16kg/t of lime steel, 15~20kg/t of dolomitic lime steel and acid composite slag 8~12kg/t steel.Using cold conditions Steel-slag for steelmaking ingredients such as part lime, dolomitic lime and acid composite slags in the method for the present invention pneumatic steelmaking, realize recycling for copper smelter slag resource, significantly reduce production cost, and≤0.015%, quality meets fine steel grade requirement to the steel p and s content produced.
Description
Technical field
The invention belongs to converter steeling technology fields, and in particular to a kind of cold conditions slag returns to semi-steel making converter resource again
Change process for making.
Background technology
Pneumatic steelmaking is one of mode most competitive in current all process for making, although in terms of cost control
Converter process has always bigger advantage, but with the influence of the external factor such as steel industry excess capacity, for converter
Steel-making proposes the new demand for further decreasing smelting cost, new method, the new technology of the steel-making of converter low cost urgently develop and
Innovation.Therefore, it is necessary to there are new approaches to carry out for the technical study for climbing steel semisteel converter steelmaking, half steel converter dephosphorization effect is improved
Rate reduces smelting cost, reduces the converter quantity of slag.
It climbs steel and uses v-bearing titanomagnetite smelting, by vanadium extraction by converter blowing, V is aoxidized in vanadium extracting process molten iron, while C in molten iron,
The elements such as Si, Mn are also aoxidized.Climb the active lime of slag making materials, dolomitic lime, acid composite slag that steel converter steel-making uses
Equal multiple materials.Compared with common molten iron-steelmaking, lime need not be usually added according to the Si members in molten iron in converter semi-steel making
Equal materials are so that slag is adjusted to suitable basicity, to meet the requirement of dephosphorization, it is only necessary to be added and contain CaO, SiO2Deng material
Expect to ensure to be formed the clinker with certain dephosphorizing capacity, by the total amount of addition come so that the phosphorus content in half steel is down to steel grade
Phosphorus content requirement；But need that steelmaking ingredient is added, smelting cost is difficult to decrease.
CN103215408B discloses a kind of method that addition slag block carries out pneumatic steelmaking, including charging, oxygen supply are smelted
The weight of molten iron and slag block is as follows in the raw material being added per stove with deoxidation alloying step in ladle, this method：Iron
55~58 parts of water, 2~4 parts of slag block, 1.5~2.0 parts of quick lime, 0.65~0.8 part of light dolomite；Clinker is controlled when smelting
Basicity is 2.6~3.3.Although this method realizes the waste utilization to slag, but its slag used is copper smelter slag magnetic separation
It obtains, primarily to the iron in recycling slag steel, and there is still a need for the steelmaking ingredients such as quick lime, light dolomite are used, smelt
Cost is still higher.
Invention content
The technical problem to be solved in the present invention is to provide one kind can make full use of cold conditions slag, substantially reduces lime, height
The consumption of raw and auxiliary materials such as magnesium, acid composite slag, the lower process for making of cost.
The present invention solves technical solution used by above-mentioned technical problem, and there is provided a kind of cold conditions slags to return to half steel refining
Steel converter renewable resources process for making, including feed and include with oxygen furnace steel step, the material in the charging：Half steel water,
0~80kg/t of steel scrap steel, cold conditions 6~14kg/t of slag steel, 12~16kg/t of lime steel, 15~20kg/t of dolomitic lime steel and acid
Property composite slag 8~12kg/t steel.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, the cold conditions steel
The chemical composition of slag is calculated in mass percent as CaO：35~55%, SiO2：8~20%, MgO：5~15%, FeO：15~
25%, Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜ 1%, and it is inevitably miscellaneous
Matter.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, the cold conditions steel
The granularity of slag is 30~50mm.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, the cold conditions steel
The fusing point of slag is 1280~1350 DEG C.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, half steel
The ingredient of water is calculated in mass percent as C：3.2~4.1%, Si：0.015~0.030%, Mn：0.02~0.04%, P：0.06
~0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, half steel
The charging temperature of water is 1250~1360 DEG C.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, in the lime
CaO mass contents be 85~90%.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, the high magnesite
MgO mass contents in ash are that 30~40%, CaO mass contents are 48~55%.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, described acid multiple
Close the SiO in slag2Mass content is 45~55%.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, has gone out in converter
Steel simultaneously carries out that cold conditions slag is added after slag splashing, is then charged into half steel water, or be packed into half steel water and steel scrap.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, and oxygen furnace steel is opened
When the beginning, 2/3rds of lime, dolomitic lime and the total dosage of acid composite slag are added in converter, by remaining one third
Lime, dolomitic lime and acid composite slag add during oxygen furnace steel in batches.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, when oxygen furnace steel,
Oxygen consumption is 40~60Nm3/ t steel；Oxygen lance nozzle is 1.4~1.6m away from the basic rifle position of molten pool metal liquid level, and blowing rifle position is 1.4m
~1.6m is opened and is blown rifle position for 1.6~2.0m, and catch carbon rifle position is 1.2~1.6m；First basicity of slag is 2.5~3.0, and finishing slag basicity is
3.0~4.0.
Wherein, cold conditions slag described above returns in semi-steel making converter renewable resources process for making, and steel-making terminates, and obtains
To molten steel in phosphorus content≤0.015%, sulfur content≤0.015%.
Advantageous effect of the invention is：
Using cold conditions Steel-slag for refinings such as part lime, dolomitic lime and acid composite slags in the method for the present invention pneumatic steelmaking
Steel auxiliary material realizes recycling for copper smelter slag resource, significantly reduces production cost, reduces and stacks cold conditions slag
Site area reduces the environmental protection pressure of enterprise, contributes to the sustainable development of iron and steel enterprise；Control steel-making parameter, energy simultaneously
The melting of the lime of quickening, rapid slagging, slag state is active, improves dephosphorization, the desulphurizing ability of clinker；And the method for the present invention produces
Steel p and s content≤0.015%, quality meets fine steel grade requirement.
Specific implementation mode
Specifically, a kind of cold conditions slag returns to semi-steel making converter renewable resources process for making, including charging and oxygen blast refining
Steel step, the charging include：Half steel water, 0~80kg/t of steel scrap steel, cold conditions 6~14kg/t of slag steel, lime 12~
16kg/t steel, 15~20kg/t of dolomitic lime steel and acid composite slag 8~12kg/t steel.
Due to current cold conditions slag bulk deposition, pneumatic steelmaking cost is again higher, and it is cold whether inventor's thinking can utilize
The steelmaking ingredients such as state steel slag instead part lime, dolomitic lime, acid composite slag, so not only realize the recycling of cold conditions slag
It utilizes, more greatly reduces pneumatic steelmaking cost.
Inventor carries out theory analysis to the dephosphorizing capacity of cold conditions slag first, and steel-making dephosphorisation reaction can be indicated by (1) formula：
2 [P]+5 [O]=(P2O5) (1)
ΔGo=-151200+123.74T (2)
According to isotherm equation,
Being intended to formula (2) can carry out, then Δ G must be negative value, i.e. J ＜ K；AndWork as T=1873
When, K=4.4 × 10-10。
Thus it is possible to which the condition that formula (2) can carry out is：
According to climbing steel converter typical case's slag composition CaO：40%；SiO2：12%；MgO：12%；FeO：20%；MnO：6%,
Calculate to obtain γP2O5=4.17 × 10-18.Molten steel terminal [P]=0.012%, [O]=0.06% then calculate to obtain pole in converter finishing slag
Limit P2O5Molar concentration is 0.0118, is approximately equivalent to 2.36%P2O5.Climb steel converter finishing slag P2O5Generally 1.0% or so, far
Less than ultimate target, this explanation climbs the existing Operating parameters of steel and is far from reaching optimum value, therefore converter is all or part of
Has feasibility for making steel using cold conditions slag.
This method proposes that a kind of cold conditions slag returns to semi-steel making converter renewable resources process for making, climbs steel converter and grew originally
Phosphorus content reaches far away the dephosphorization limit in the cold conditions slag that time steel-making generates, and cold conditions slag again renewable resources is used for converter
Steel-making, had both made full use of a large amount of CaO, SiO in cold conditions slag2, MgO, FeO etc. be beneficial to the ingredient of steel-making, and help to drop
The steel technology of low convertor steelmaking process finally significantly reduces production cost in actual use.
The present invention needs the steel-making such as the lime being added when cold conditions slag can be used to substitute general semisteel converter steelmaking completely
Auxiliary material after being 30~50mm at granularity by cold conditions slag Mechanical Crushing, can go out steel in converter and add after slag splashing
Enter steel-making；The chemical composition of cold conditions slag is calculated in mass percent as CaO：35~55%, SiO2：8~20%, MgO：5~
15%, FeO：15~25%, Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜ 1%, and
Inevitable impurity；Its fusing point is 1280~1350 DEG C.
The ingredient of half steel water is calculated in mass percent as C in the method for the present invention：3.2~4.1%, Si：0.015~
0.030%, Mn：0.02~0.04%, P：0.06~0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity；
Its charging temperature is 1250~1360 DEG C.
CaO mass contents in the method for the present invention in lime are 85~90%；MgO mass contents in dolomitic lime are 30
~40%, CaO mass content are 48~55%；SiO in acid composite slag2Mass content is 45~55%.
In the method for the present invention, the loading operation of each material is specific as follows：After converter has gone out steel and carries out slag splashing
Cold conditions slag is added, is then charged into half steel water, or be packed into half steel water and steel scrap；When oxygen furnace steel starts, by lime,
Dolomitic lime is added to 2/3rds of the total dosage of acid composite slag in converter, by the lime of remaining one third, high magnesite
Ash and acid composite slag add during oxygen furnace steel in batches, add when clinker relatively enlivens remaining lime, dolomitic lime and
Acid composite slag, to ensure having enough mobility and desulfurization, dephosphorizing capacity, be left the lime of one third, dolomitic lime and
Acid composite slag is mainly added according to the slugging state of converter in batches, primarily to it is dry to avoid process from returning.
Since the method for the present invention uses the steel-making such as the lime for needing to be added when cold conditions steel slag instead part semisteel converter steelmaking
Auxiliary material, in order to ensure that slag has good mobility, to achieve the purpose that quick dephosphorization；Total blowing Controlling principle is：Soon
Fast slugging, early slugging, clinker is active, and process is not returned dry, not splash and supplied；Therefore when the blowing of the method for the present invention control oxygen, oxygen consumption is
40~60Nm3/ t steel；Oxygen lance nozzle is 1.4~1.6m away from the basic rifle position of molten pool metal liquid level, and blowing rifle position is 1.4m~1.6m,
It opens and blows rifle position for 1.6~2.0m, catch carbon rifle position is 1.2~1.6m；First basicity of slag is 2.5~3.0, finishing slag basicity is 3.0~
4.0, low first basicity of slag is slugging for convenience, and finishing slag basicity height is in order to facilitate dephosphorization.
The molten steel composition that the method for the present invention blows fully meets steel grade requirement：Finishing blowing, phosphorus in obtained molten steel
Content≤0.015%, sulfur content≤0.015%,
The serial screw-thread steel such as production HRB400 is fully able to using this method method, and significantly reduces cost；With
The dosage of common process ratio, lime reduces 1.5~4kg/t steel, and dolomitic lime dosage reduces 1.5~4kg/t steel, the use of composite slag
Amount reduces 0.7~2kg/t steel.Dosage according to theoretical cold conditions slag is 8.668kg/t steel, then pneumatic steelmaking major auxiliary burden lime
Dosage be 12~16kg/ stoves, dolomitic lime dosage be 15~20kg/t steel, acid composite slag dosage be 8~12kg/t
Steel；Smelt heat relative to normal, the dosage of major auxiliary burden lime be 15~20kg/t steel, dolomitic lime dosage be 18~
23kg/t steel, acid composite slag dosage be 10~14kg/t steel；Thus it calculates, cold conditions steel slag instead part is added in the present invention
Cost steelmaking ingredient can reduce steel-making cost 2~6 yuan/t steel.
Steel in the present invention in t steel refers both to be the molten steel obtained after smelting.
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
The steel of HRE400 steel grades is smelted in 120 tons of converters.It is 131t actually to enter stove half steel weight of molten iron, and steel scrap weight is
9t, tapping weight is 128.8t.Half steel hot metal composition and temperature conditions are as shown in table 1 below.The auxiliary material amount being actually added into and oxygen blast
Amount is as shown in table 2.Go out composition of steel and tapping temperature is as shown in table 3 below.
1 half steel hot metal composition (%) of table and charging temperature (DEG C)
| C | Si | Mn | P | S | Charging temperature | |
| Half steel water | 3.84 | 0.02 | 0.03 | 0.075 | 0.012 | 1300 |
The 2 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 3 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature | |
| Tapping molten steel | 0.06 | 0.023 | 0.03 | 0.011 | 0.010 | 1675 |
After upper heat slag splashing, cold conditions slag is added to converter, be then charged into half steel water and is given up
When oxygen furnace steel starts, 2/3rds of lime, dolomitic lime and the total dosage of acid composite slag are added in converter for steel, will
Lime, dolomitic lime and the acid composite slag of remaining one third add during oxygen furnace steel in batches, and process slag is active, has
Stronger dephosphorizing capacity；Oxygen lance nozzle away from the basic rifle position of molten pool metal liquid level be 1.4~1.6m, blowing rifle position for 1.4m~
1.6m is opened and is blown rifle position for 1.8m, and catch carbon rifle position is 1.4m；Tapping terminates using conventional slag splashing technique, and furnace wall dross is good.
It is 2.6 that this stove, which smelts just basicity of slag, finishing slag basicity 4.0, and full iron is 19% in finishing slag, and oxygen activity is 400ppm, is taken
Obtain preferable result.
Embodiment 2
The steel of DTLA steel grades is smelted in 120 tons of converters.It is 143t actually to enter stove half steel weight of molten iron, and steel scrap weight is
0t, tapping weight is 131.56t.Half steel hot metal composition and temperature conditions are as shown in table 4 below.The auxiliary material amount being actually added into and oxygen blast
Amount is as shown in table 5.Go out composition of steel and tapping temperature is as shown in table 6 below.
4 half steel hot metal composition (%) of table and charging temperature (DEG C)
The 5 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 6 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature | |
| Tapping molten steel | 0.06 | 0.023 | 0.03 | 0.011 | 0.010 | 1675 |
After upper heat slag splashing, cold conditions slag is added to converter, is then charged into half steel water, oxygen blast
When steel-making starts, 2/3rds of lime, dolomitic lime and the total dosage of acid composite slag are added in converter, it will be three points remaining
One of lime, dolomitic lime and acid composite slag added during oxygen furnace steel in batches, process slag is active, has stronger de-
Phosphorus ability；Oxygen lance nozzle is 1.4~1.6m away from the basic rifle position of molten pool metal liquid level, and blowing rifle position is 1.4m~1.6m, opens and blows rifle
Position is 1.8m, and catch carbon rifle position is 1.4m；Tapping terminates using conventional slag splashing technique, and furnace wall dross is good.
It is 2.9 that this stove, which smelts just basicity of slag, finishing slag basicity 4.1, and full iron is 19% in finishing slag, and oxygen activity is 420ppm, is taken
Obtain preferable result.
Embodiment 3
The steel of Q235 steel grades is smelted in 120 tons of converters.It is 130t actually to enter stove half steel weight of molten iron, and steel scrap weight is
6t, tapping weight is 125.12t.Half steel hot metal composition and temperature conditions are as shown in table 7 below.The auxiliary material amount being actually added into and oxygen blast
Amount is as shown in table 8.Go out composition of steel and tapping temperature is as shown in table 9 below.
7 half steel hot metal composition (%) of table and charging temperature (DEG C)
| C | Si | Mn | P | S | Charging temperature | |
| Half steel water | 3.81 | 0.03 | 0.04 | 0.065 | 0.011 | 1330 |
The 8 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 9 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature | |
| Tapping molten steel | 0.08 | 0.02 | 0.03 | 0.010 | 0.011 | 1670 |
After upper heat slag splashing, cold conditions slag is added to converter, be then charged into half steel water and is given up
When oxygen furnace steel starts, 2/3rds of lime, dolomitic lime and the total dosage of acid composite slag are added in converter for steel, will
Lime, dolomitic lime and the acid composite slag of remaining one third add during oxygen furnace steel in batches；Oxygen lance nozzle is away from molten
Metal bath surface basic rifle position in pond is 1.4~1.6m, and blowing rifle position is 1.4m~1.6m, opens and blows rifle position for 1.8m, catch carbon rifle position is
1.4m；Tapping terminates using conventional slag splashing technique, and furnace wall dross is good.
It is 2.5 that this stove, which smelts just basicity of slag, finishing slag basicity 4.2, and full iron is 20% in finishing slag, and oxygen activity is 480ppm, is taken
Obtain preferable result.
Comparative example 1
The steel of Q235 steel grades is smelted in 120 tons of converters.It is 130t actually to enter stove half steel weight of molten iron, and steel scrap weight is
6t, tapping weight is 125.12t.Half steel hot metal composition and temperature conditions are as shown in upper table 7.The auxiliary material amount being actually added into and oxygen blast
Amount is as shown in table 10.Go out composition of steel and tapping temperature as shown in upper table 11.
The 10 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 11 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature | |
| Tapping molten steel | 0.08 | 0.02 | 0.03 | 0.010 | 0.011 | 1670 |
After upper heat slag splashing, half steel water and steel scrap are packed into converter, it, will when oxygen furnace steel starts
Lime, dolomitic lime and the acid total dosage of composite slag 2/3rds are added in converter, by the lime of remaining one third, height
Magnesium lime and acid composite slag add during oxygen furnace steel in batches, and smelting terminates, 1675 DEG C of liquid steel temperature in stove, molten steel at
Divide and meet steel grade requirement, but production cost wants high with respect to the present invention.
Claims (10)
1. cold conditions slag returns to semi-steel making converter renewable resources process for making, including charging and oxygen furnace steel step, feature
It is：Material in the charging includes：Half steel water, 0~80kg/t of steel scrap steel, cold conditions 6~14kg/t of slag steel, lime 12
~16kg/t steel, 15~20kg/t of dolomitic lime steel and acid composite slag 8~12kg/t steel.
2. cold conditions slag according to claim 1 returns to semi-steel making converter renewable resources process for making, it is characterised in that：
The chemical composition of the cold conditions slag is calculated in mass percent as CaO：35~55%, SiO2：8~20%, MgO：5~15%,
FeO：15~25%, Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜ 1%, and can not keep away
The impurity exempted from.
3. cold conditions slag according to claim 1 or 2 returns to semi-steel making converter renewable resources process for making, feature exists
In：The granularity of the cold conditions slag is 30~50mm；The fusing point of the cold conditions slag is 1280~1350 DEG C.
4. cold conditions slag according to claim 1 returns to semi-steel making converter renewable resources process for making, it is characterised in that：
The ingredient of half steel water is calculated in mass percent as C：3.2~4.1%, Si：0.015~0.030%, Mn：0.02~
0.04%, P：0.06~0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity.
5. cold conditions slag according to claim 1 returns to semi-steel making converter renewable resources process for making, it is characterised in that：
The charging temperature of half steel water is 1250~1360 DEG C.
6. cold conditions slag according to claim 1 returns to semi-steel making converter renewable resources process for making, it is characterised in that：
At least meet it is following in one：
CaO mass contents in the lime are 85~90%；
MgO mass contents in the dolomitic lime are that 30~40%, CaO mass contents are 48~55%；
SiO in the acidity composite slag2Mass content is 45~55%.
7. semi-steel making converter renewable resources process for making is returned to according to claim 1~6 any one of them cold conditions slag,
It is characterized in that：Go out steel in converter and carried out that cold conditions slag is added after slag splashing, is then charged into half steel water, or be packed into
Half steel water and steel scrap.
8. semi-steel making converter renewable resources process for making is returned to according to claim 1~6 any one of them cold conditions slag,
It is characterized in that：When oxygen furnace steel starts, converter is added to by 2/3rds of lime, dolomitic lime and the total dosage of acid composite slag
In, the lime of remaining one third, dolomitic lime and acid composite slag are added during oxygen furnace steel in batches.
9. cold conditions slag according to claim 1 returns to semi-steel making converter renewable resources process for making, it is characterised in that：
When oxygen furnace steel, oxygen consumption is 40~60Nm3/ t steel；Oxygen lance nozzle is 1.4~1.6m, blowing away from the basic rifle position of molten pool metal liquid level
Rifle position is 1.4m~1.6m, opens and blows rifle position for 1.6~2.0m, catch carbon rifle position is 1.2~1.6m；First basicity of slag is 2.5~3.0,
Finishing slag basicity is 3.0~4.0.
10. semi-steel making converter renewable resources process for making is returned to according to claim 1~9 any one of them cold conditions slag,
It is characterized in that：Steel-making terminates, phosphorus content≤0.015%, sulfur content≤0.015% in obtained molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266668.9A CN108441597A (en) | 2018-03-28 | 2018-03-28 | A kind of cold conditions slag return semi-steel making converter renewable resources process for making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810266668.9A CN108441597A (en) | 2018-03-28 | 2018-03-28 | A kind of cold conditions slag return semi-steel making converter renewable resources process for making |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108441597A true CN108441597A (en) | 2018-08-24 |
Family
ID=63197211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810266668.9A Pending CN108441597A (en) | 2018-03-28 | 2018-03-28 | A kind of cold conditions slag return semi-steel making converter renewable resources process for making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108441597A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108998621A (en) * | 2018-09-19 | 2018-12-14 | 攀钢集团攀枝花钢铁研究院有限公司 | The half steel converter smelting method of Q235B steel |
| CN109371193A (en) * | 2018-12-10 | 2019-02-22 | 攀枝花钢城集团有限公司 | The method that converter slag is used for pneumatic steelmaking |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555537A (en) * | 2009-05-12 | 2009-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel steelmaking method |
| 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 |
| CN102312037A (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 |
| CN103146873A (en) * | 2013-03-29 | 2013-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Enriching sludge ball for semisteel steelmaking and slagging method for semisteel steelmaking |
-
2018
- 2018-03-28 CN CN201810266668.9A patent/CN108441597A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555537A (en) * | 2009-05-12 | 2009-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel steelmaking method |
| 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 |
| CN102312037A (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 |
| CN103146873A (en) * | 2013-03-29 | 2013-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Enriching sludge ball for semisteel steelmaking and slagging method for semisteel steelmaking |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108998621A (en) * | 2018-09-19 | 2018-12-14 | 攀钢集团攀枝花钢铁研究院有限公司 | The half steel converter smelting method of Q235B steel |
| CN108998621B (en) * | 2018-09-19 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel converter smelting method of Q235B steel |
| CN109371193A (en) * | 2018-12-10 | 2019-02-22 | 攀枝花钢城集团有限公司 | The method that converter slag is used for pneumatic steelmaking |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102212643B (en) | Converter less-slag smelting process | |
| CN104911295B (en) | The smelting process that a kind of converter less-slag material is added | |
| CN105112595B (en) | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN103352101B (en) | Low-cost smelting technology of converter | |
| CN108913837A (en) | A kind of high scrap ratio smelting process of converter | |
| CN112322837A (en) | Smelting process for efficient slagging and desulfurization of LF (ladle furnace) aluminum killed steel | |
| CN101597664B (en) | Oxygen top-blown converter steelmaking method | |
| CN108251592A (en) | A kind of converter smelting method of extremely low phosphoretic steel | |
| CN109897933A (en) | A kind of efficient smelting process of the low-phosphorous clean steel of converter producing | |
| CN104032095B (en) | A kind of method of liquid steel dephosphorization agent and liquid steel dephosphorization | |
| CN105861775A (en) | Smelting process for ultra-low phosphorus steel with high nickel content | |
| CN104195290A (en) | Molten steel dephosphorization agent and molten steel dephosphorization refining method | |
| CN103146873B (en) | The semi-steel making slagging method of enrichment sludge ball and semi-steel making | |
| CN105132611B (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN103627843B (en) | Semi-steel making slagging method and Semi-steel making method | |
| CN104017932B (en) | The method of the two slag steel-making of a kind of converter | |
| CN105039634A (en) | Dephosphorization method for converter steelmaking process | |
| CN108315524A (en) | A method of reducing semi-steel making supplementary product onsumption | |
| CN108441597A (en) | A kind of cold conditions slag return semi-steel making converter renewable resources process for making | |
| CN102994685B (en) | Method for opening steel converter | |
| CN107365886A (en) | A kind of method of converter high temperature dephosphorization | |
| CN104060020A (en) | Dephosphorizing steelmaking method for increasing manganese content in molten steel at terminal of convertor | |
| CN104726645A (en) | Dephosphorization method of mid-high phosphorus semisteel | |
| CN108660277A (en) | A kind of cold conditions slag return semi-steel making converter renewable resources low cost process for making |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180824 |