CN103866077B - The two slag of a kind of semi-steel making stays the method for making steel of slag - Google Patents
The two slag of a kind of semi-steel making stays the method for making steel of slag Download PDFInfo
- Publication number
- CN103866077B CN103866077B CN201210544071.9A CN201210544071A CN103866077B CN 103866077 B CN103866077 B CN 103866077B CN 201210544071 A CN201210544071 A CN 201210544071A CN 103866077 B CN103866077 B CN 103866077B
- Authority
- CN
- China
- Prior art keywords
- slag
- steel
- add
- oxygen
- making
- 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.)
- Active
Links
Classifications
-
- 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
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses the method for making steel that the two slag of a kind of semi-steel making stays slag, it comprises: 1) there is the condition of slag in converter molten pool under, slag making materials is added in converter molten pool, and top blast oxygen carries out blowing slag making, when the bath temperature in converter be 1350-1450 DEG C, the basicity of slag be all iron content in 1.4-2.5, slag by weight percentage for 12-16 % by weight time, pour out the slag A of 40-80 % by weight; 2) under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when the bath temperature in converter be 1650-1690 DEG C, the basicity of slag be all iron content in 3.3-4.2, slag by weight percentage for 15-28 % by weight time, stay slag to tap; 3) carry out the operation of slag splashing after having tapped, obtain slag B; Wherein, in step 1), before adding slag making materials, the slag be present in converter molten pool is whole slag B that step 3) obtains.By this method for making steel, can dephosphorization effect be improved, make phosphorus content drop to less than 0.007 % by weight.
Description
Technical field
The present invention relates to the method for making steel that the two slag of a kind of semi-steel making stays slag.
Background technology
Carrying out for adopting schreyerite resource smelting the enterprise produced, in order to ensure the effective utilization to vanadium resource, needing to carry out vanadium extraction and desulfurization before steel-making.What hot metal containing V-Ti obtained after desulfurization vanadium extraction is commonly referred to half steel, and in this half steel, the mass percentage of carbon is 3.4-4.0%, and the heating such as silicon, manganese slagging constituent content is trace, and in half steel, the mass percentage of sulphur controls within 0.015%.But, owing to not carrying out dephosphorization treatment, in half steel, the mass percentage of phosphoric is generally 0.060-0.080%, and this causes adopting after traditional converter smelting process completes smelting to this half steel, and the fluctuation of BOF Steelmaking Endpoint phosphorus element content is between 0.008-0.020%.As can be seen here, in the prior art, because half steel converter smelting process has in converting process, acid slagging material is few, slag system constituent element is single and the features such as shortage of heat, therefore, compared with common molten iron converter smelting process, the features such as common having of half steel converter smelting process slag difficulty, dephosphorization effect are not remarkable.
Further, in existing Semi-steel making method, the problem that when there is auxiliary material more, the production high-quality Low-phosphorus Steel that steel-making needs, cost is higher.
Summary of the invention
The object of the invention is to the problem that auxiliary material is more, cost is higher overcoming the needs existed in above-mentioned prior art, provide a kind of dephosphorization effect better, and the method for making steel that cost is low.
The present inventor finds through deep research, the dephosphorization in an early stage upper stove terminal slag being used for next heat is smelted, the slag of such high oxidation will be conducive to the metallurgical performance improving slag in early stage, namely be conducive to the quick formation of slag in early stage, improve the mobility of slag, be of value to the carrying out of dephosphorisation reaction, and slag amount increase in early stage, more be conducive to increasing the sendout of phosphorus in slag, improve dephosphorization effect.In addition, can the consumption of less slag making materials, reduce costs.
Thus, the invention provides the method for making steel that the two slag of a kind of semi-steel making stays slag, wherein, the method is further comprising the steps of:
1) there is the condition of slag in converter molten pool under, slag making materials is added in converter molten pool, and top blast oxygen carries out blowing slag making, when the bath temperature in converter be 1350-1450 DEG C, the basicity of slag be all iron content in 1.4-2.5, slag by weight percentage for 12-16 % by weight time, pour out the slag A of 40-80 % by weight;
2) under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when the bath temperature in converter be 1650-1690 DEG C, the basicity of slag be all iron content in 3.3-4.2, slag by weight percentage for 15-28 % by weight time, stay slag to tap;
3) carry out the operation of slag splashing after having tapped, obtain the slag B be present in converter;
4) step 1)-3 is carried out in circulation), wherein, the slag be present in step 1) in converter molten pool is whole slag B that step 3) obtains.
According to method for making steel of the present invention, a stove terminal slag can be effectively utilized, and use such slag to be conducive to improving the metallurgical performance of slag in early stage, be of value to the carrying out of dephosphorisation reaction, improve dephosphorization effect, make phosphorus content drop to less than 0.007 % by weight.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Method for making steel provided by the invention comprises the following steps:
1) there is the condition of slag in converter molten pool under, slag making materials is added in converter molten pool, and top blast oxygen carries out blowing slag making, when the bath temperature in converter be 1350-1450 DEG C, the basicity of slag be all iron content in 1.4-2.5, slag by weight percentage for 12-16 % by weight time, pour out the slag A of 40-80 % by weight;
2) under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when the bath temperature in converter be 1650-1690 DEG C, the basicity of slag be all iron content in 3.3-4.2, slag by weight percentage for 15-28 % by weight time, stay slag to tap;
3) carry out the operation of slag splashing after having tapped, obtain the slag B be present in converter;
4) step 1)-3 is carried out in circulation), wherein, the slag be present in step 1) in converter molten pool is whole slag B that step 3) obtains.
According to method of the present invention, smelt because the present invention relates generally to the dephosphorization in an early stage upper stove terminal slag being all used for next heat, to not special requirement such as the step of the decarburization intensification in steelmaking process etc., can carry out with reference to the normal condition of this area.
According to method of the present invention, under preferable case, in step 1), add before slag making materials carries out slag making in converter molten pool, the amount being present in slag in converter molten pool is 28-42kg/t steel; Be preferably 30-39kg/t steel.
According to method of the present invention, under preferable case, in step 1), when the bath temperature in converter be 1380-1420 DEG C, the basicity of slag be all iron content in 1.5-1.8, slag by weight percentage for 13-15 % by weight time, pour out the slag A of 50-75 % by weight.
According to method of the present invention, in step 1), the described slag B that there is slag and obtain for employing method of the present invention in converter molten pool.That is method of the present invention is the generation slag B that a upper stove obtains being directly used in next stove, is a kind ofly to carry out the method for making steel that two slag stays slag continuously.Although method of the present invention can continuous circulation repeatedly, from suppressing the accumulation of phosphorus content in converter to be considered, preferred cycle number of times is less than 10 times; More preferably circulation 3-5 time.
In addition, can for the terminal slag adopting conventional Semi-steel making method to obtain for the primary slags in the present invention, its composition can be identical with the slag B in step 3).Such primary slags add-on is 28-42kg/t steel; Be preferably 30-39kg/t steel.
According to method of the present invention, in step 1), described slag making materials comprises quickened lime, high magnesium lime and composite fluxing medium, the add-on of described slag making materials is: the add-on of described quickened lime is 10-22kg/t steel, high magnesium lime add-on is 10-22kg/t steel, and the add-on of described composite fluxing medium is 5-12kg/t steel.Under preferable case, the add-on of described quickened lime is 11.5-19.5kg/t steel, and high magnesium lime add-on is 11.5-15.5kg/t steel, and the add-on of described composite fluxing medium is 6-9.5kg/t steel
In the present invention, adopt top blast oxygen to carry out blowing slag making in step 1), described top blast oxygen adopts dephosphorization oxygen lance to carry out.The condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 2.5-3.8Nm
3/ (t steel min), duration of blast is 4-8min, and the rifle position of dephosphorization oxygen lance is 1.4-2m; Preferred oxygen supply intensity is 2.8-3.2Nm
3/ (t steel min), duration of blast is 5-7min, and the rifle position of dephosphorization oxygen lance is 1.5-1.8m.
In the present invention, unit " Nm
3/ (t steel min) " refer to relative to molten steel per ton, the oxygen flow (in standard volume) of per minute.
According to method of the present invention, in preferred situation, step 2) in, when the bath temperature in converter be 1670-1680 DEG C, the basicity of slag be all iron content in 3.5-4, slag by weight percentage for 18-25 % by weight time, stay slag to tap.
According to method of the present invention, step 2) in, described slag making materials comprises quickened lime, high magnesium lime and composite fluxing medium, the add-on of described slag making materials is: the add-on of described quickened lime is 5-13kg/t steel, high magnesium lime add-on is 5-13kg/t steel, and the add-on of described composite fluxing medium is 5-13kg/t steel.The add-on of preferred described quickened lime is 7-12kg/t steel, and high magnesium lime add-on is 7-12kg/t steel, and the add-on of described composite fluxing medium is 7-11kg/t steel.
In the present invention, described quickened lime, high magnesium lime and composite fluxing medium can for this area in steel-making quickened lime, high magnesium lime and the composite fluxing medium commonly used.Described quickened lime is mainly containing CaO, and with the gross weight of described quickened lime for benchmark, the content of CaO is 85-90 % by weight.Described high magnesium lime is mainly containing MgO and CaO, and with the gross weight of described high magnesium lime for benchmark, the content of MgO is the content of 30-40 % by weight, CaO is 48-55 % by weight.The main component of described composite fluxing medium is SiO
2, thus compensate for the defect of heating element deficiency in the half steel after vanadium extraction.Described composite fluxing medium can for SiO2 content be 40 ~ 90% acid steelmaking slagging material; Under preferable case, in described composite fluxing medium, the content of SiO2 is 50-60 % by weight, and normally used composite fluxing medium can be such as quartz sand.
In the present invention, in step 2) in when adopting top blast oxygen to carry out blowing slag making, the oxygen rifle that described top blast oxygen uses can carry out for adopting in step 1) top blast oxygen the dephosphorization oxygen lance used when blowing slag making, also can use and carry out with this dephosphorization oxygen lance difference oxygen rifle.But preferred steps 1) and step 2) in adopt same oxygen rifle blow, this is because in step 1) and step 2) in adopt same oxygen rifle blow, do not need to switch back and forth and be not easy to cause equipment failure, be conducive to the convenience of operation and carrying out smoothly of production, thus raise the efficiency.
Step 2) in adopt top blast oxygen carry out the blowing condition of slag making to comprise: oxygen supply intensity is 3-4Nm
3/ (t steel min), duration of blast is 6-10min, and the rifle position of oxygen rifle is 1.4-2m; Preferred oxygen supply intensity is 3.5-3.8Nm
3/ (t steel min), duration of blast is 7-8min, and the rifle position of oxygen rifle is 1.5-1.8m.
According to method of the present invention, in step 3), described slag splashing operation can adopt method known in the field to carry out, such as by adopting oxygen lance spraying nitrogen blowing to carry out, and the rifle position of oxygen rifle is 0.25-3.0m, spattering the slag time is 2-5min, and the air supply intensity of nitrogen is 3.5-4.5Nm
3/ (t steel min).
According to method of the present invention, in described molten bath until the steel raw material of dephosphorization be the half steel of vanadium titano-magnetite after vanadium extraction and sulfur removal technology.Described vanadium titano-magnetite obtains method that the method for half steel and condition can adopt this area general and condition after vanadium extraction and sulfur removal technology, at this, does not state tired.
In preferred situation, in described half steel, each component concentration is: C:3.2-4.0 % by weight; Fe:95-97 % by weight; P:0.04-0.06 % by weight; Si:0.01-0.03 % by weight; Mn:0.01-0.03 % by weight; V:0.01-0.04 % by weight; Ti:0.01-0.02 % by weight.
Below will be described the present invention by embodiment, but the present invention is not limited in following embodiment
The terminal slag of the primary slags used in initial procedure in following examples for obtaining in semi-steel making.
Half steel in following examples is that vanadium titano-magnetite obtains half steel after vanadium extraction and sulfur removal technology.
Embodiment 1
(in following quickened lime, the content of CaO is 88 % by weight to initial procedure; In high magnesium lime, the content of MgO is the content of 30 % by weight, CaO is 52 % by weight; SiO in composite fluxing medium
2content be 55 % by weight.）
1) in converter molten pool, add primary slags and half steel 120 tons (composition and content are in table 1), wherein primary slags add-on is 38.46Kg/t steel.Then in converter molten pool, slag making materials is added, and top blast oxygen carries out blowing slag making, when bath temperature in converter is 1420 DEG C, the basicity of slag is 1.7, all iron content in slag is 15 % by weight by weight percentage, pour out the slag A of 75 % by weight, each composition in the half steel now after blowing and content are in table 1.Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 19.23kg/t steel, and high magnesium lime add-on is 15.38kg/t steel, and the add-on of described composite fluxing medium is 9.23kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 2.8Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance is 1.5m, and duration of blast is 7min.
2) then, under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when bath temperature in converter is 1670 DEG C, the basicity of slag is 4, all iron content in slag is 18 % by weight by weight percentage, carry out tap (each composition in molten steel and content are in table 1).Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 11.54kg/t steel, and high magnesium lime add-on is 11.54kg/t steel, and the add-on of described composite fluxing medium is 10.77kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.7Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance (identical with the oxygen rifle in step 1)) is 1.5m, and duration of blast is 7min.
3) carry out the operation of slag splashing after having tapped, obtain slag B.The operation of slag splashing adopts oxygen lance spraying nitrogen blowing to carry out, and the rifle position of oxygen rifle is 0.5m, and spattering the slag time is 3min, and the air supply intensity of nitrogen is 3.8Nm
3/ (t steel min).
Once (in following quickened lime, the content of CaO is 90 % by weight in circulation; In high magnesium lime, the content of MgO is the content of 36 % by weight, CaO is 49 % by weight; SiO in composite fluxing medium
2content be 58 % by weight.）
1) above-mentioned steps 3 is completed) after, less than slag discharging B, directly half steel (composition and content are in table 1) is joined in converter molten pool (relative to the half steel added, slag B is 30.77Kg/t steel), then in converter molten pool, slag making materials is added, and top blast oxygen carries out blowing slag making, when bath temperature in converter is 1380 DEG C, the basicity of slag is 1.5, all iron content in slag is 13 % by weight by weight percentage, pour out the slag A of 50 % by weight, each composition in the half steel now after blowing and content are in table 1.Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 11.54kg/t steel, and high magnesium lime add-on is 11.54kg/t steel, and the add-on of described composite fluxing medium is 6.15kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance is 1.7m, and duration of blast is 6min.
2) then, under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when bath temperature in converter is 1680 DEG C, the basicity of slag is 3.5, all iron content in slag is 22 % by weight by weight percentage, carry out tap (each composition in molten steel and content are in table 1).Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 7.69kg/t steel, and high magnesium lime add-on is 7.69kg/t steel, and the add-on of described composite fluxing medium is 7.69kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.5Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance (identical with the oxygen rifle in step 1)) is 1.6m, and duration of blast is 8min.
3) carry out the operation of slag splashing after having tapped, obtain slag B.The operation of slag splashing adopts oxygen lance spraying nitrogen blowing to carry out, and the rifle position of oxygen rifle is 1m, and spattering the slag time is 5min, and the air supply intensity of nitrogen is 4.2Nm
3/ (t steel min).
(in following quickened lime, the content of CaO is 85 % by weight to secondary circulation; In high magnesium lime, the content of MgO is 40 % by weight, and in high magnesium lime, the content of CaO is 55 % by weight; SiO in composite fluxing medium
2content be 51 % by weight.）
1) after completing the above-mentioned step 3) once circulated, less than slag discharging B, directly half steel (composition and content are in table 1) is joined in converter molten pool (relative to the half steel added, slag B is 34Kg/t steel), then in converter molten pool, slag making materials is added, and top blast oxygen carries out blowing slag making, when bath temperature in converter is 1400 DEG C, the basicity of slag is 1.8, all iron content in slag is 14 % by weight by weight percentage, pour out the slag A of 65 % by weight, each composition in the half steel now after blowing and content are in table 1.Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 15kg/t steel, and high magnesium lime add-on is 13kg/t steel, and the add-on of described composite fluxing medium is 7.5kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.2Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance is 1.8m, and duration of blast is 5min.
2) then, under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when bath temperature in converter is 1670 DEG C, the basicity of slag is 3.75, all iron content in slag is 25 % by weight by weight percentage, carry out tap (each composition in molten steel and content are in table 1).Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 9kg/t steel, and high magnesium lime add-on is 9kg/t steel, and the add-on of described composite fluxing medium is 9kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.8Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance (identical with the oxygen rifle in step 1)) is 1.8m, and duration of blast is 7min.
3) carry out the operation of slag splashing after having tapped, obtain slag B.The operation of slag splashing adopts oxygen lance spraying nitrogen blowing to carry out, and the rifle position of oxygen rifle is 1m, and spattering the slag time is 5min, and the air supply intensity of nitrogen is 4.2Nm
3/ (t steel min).
(in following quickened lime, the content of CaO is 88 % by weight in three circulations; In high magnesium lime, the content of MgO is the content of 30 % by weight, CaO is 52 % by weight; SiO in composite fluxing medium
2content be 55 % by weight.）
1) after completing the step 3) of above-mentioned secondary circulation, less than slag discharging B, directly half steel (composition and content are in table 1) is joined in converter molten pool (relative to the half steel added, slag B is 38.46Kg/t steel), then in converter molten pool, slag making materials is added, and top blast oxygen carries out blowing slag making, when bath temperature in converter is 1420 DEG C, the basicity of slag is 1.7, all iron content in slag is 15 % by weight by weight percentage, pour out the slag A of 75 % by weight, each composition in the half steel now after blowing and content are in table 1.Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 19.23kg/t steel, and high magnesium lime add-on is 15.38kg/t steel, and the add-on of described composite fluxing medium is 9.23kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.4Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance is 1.5m, and duration of blast is 5min.
2) then, under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when bath temperature in converter is 1670 DEG C, the basicity of slag is 4, all iron content in slag is 17 % by weight by weight percentage, carry out tap (each composition in molten steel and content are in table 1).Wherein, this slag making materials is made up of quickened lime, high magnesium lime and composite fluxing medium, and the add-on of described quickened lime is 11.54kg/t steel, and high magnesium lime add-on is 11.54kg/t steel, and the add-on of described composite fluxing medium is 10.77kg/t steel; Above-mentioned top blast oxygen adopts dephosphorization oxygen lance to carry out, and the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 3.3Nm
3/ (t steel min), the rifle position of dephosphorization oxygen lance (identical with the oxygen rifle in step 1)) is 1.5m, and duration of blast is 9min.
3) carry out the operation of slag splashing after having tapped, obtain slag B.The operation of slag splashing adopts decarburization intensification oxygen lance spraying nitrogen blowing to carry out, and the rifle position of oxygen rifle is 1m, and spattering the slag time is 5min, and the air supply intensity of nitrogen is 4.2Nm
3/ (t steel min).
Table 1
Can be found out by embodiment 1, the dephosphorization in early stage adopting a upper stove terminal slag to be used for next heat is smelted, and can obtain the requirement that terminal composition meets Low-phosphorus Steel.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (7)
1. the two slag of semi-steel making stays a method for making steel for slag, and it is characterized in that, the method is further comprising the steps of:
1) there is the condition of slag in converter molten pool under, slag making materials is added in converter molten pool, and top blast oxygen carries out blowing slag making, when the bath temperature in converter be 1350-1450 DEG C, the basicity of slag be all iron content in 1.4-2.5, slag by weight percentage for 12-16 % by weight time, pour out the slag A of 40-80 % by weight;
2) under the condition of top blast oxygen, again in converter molten pool, add slag making materials, when the bath temperature in converter be 1650-1690 DEG C, the basicity of slag be all iron content in 3.3-4.2, slag by weight percentage for 15-28 % by weight time, stay slag to tap;
3) carry out the operation of slag splashing after having tapped, obtain the slag B be present in converter;
4) circulation carry out step 1)-3), cycle index is 3-5 time, wherein, step 1) in the slag be present in converter molten pool be step 3) whole slag B of obtaining;
Wherein, step 1) in adopt top blast oxygen to carry out blowing slag making, described top blast oxygen employing dephosphorization oxygen lance carries out; And step 1) and step 2) in adopt same oxygen rifle blow;
Step 1) in, add before slag making materials carries out slag making in converter molten pool, the amount being present in slag in converter molten pool is 28-42kg/t steel.
2. method according to claim 1, wherein, step 1) in, described slag making materials comprises quickened lime, high magnesium lime and composite fluxing medium, the add-on of described slag making materials is: the add-on of described quickened lime is 10-22kg/t steel, high magnesium lime add-on is 10-22kg/t steel, and the add-on of described composite fluxing medium is 5-12kg/t steel.
3. method according to claim 1, wherein, step 1) in, the condition that top blast oxygen carries out blowing slag making comprises: oxygen supply intensity is 2.5-3.8Nm
3/ (t steel min), duration of blast is 4-8min, and the rifle position of oxygen rifle is 1.4-2m.
4. method according to claim 1, wherein, step 2) in, described slag making materials comprises quickened lime, high magnesium lime and composite fluxing medium, the add-on of described slag making materials is: the add-on of described quickened lime is 5-13kg/t steel, high magnesium lime add-on is 5-13kg/t steel, and the add-on of described composite fluxing medium is 5-13kg/t steel.
5. method according to claim 1, wherein, step 2) in top blast oxygen carry out the blowing condition of slag making comprise: oxygen supply intensity is 3-4Nm
3/ (t steel min), duration of blast is 6-10min, and the rifle position of oxygen rifle is 1.4-2m.
6. method according to claim 1, wherein, in described molten bath until the steel raw material of dephosphorization be the half steel of vanadium titano-magnetite after vanadium extraction and desulfurization.
7. the method according to claim 2 or 4, wherein, described composite fluxing medium is SiO
2content is the acid steelmaking slagging material of 40 ~ 90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210544071.9A CN103866077B (en) | 2012-12-14 | 2012-12-14 | The two slag of a kind of semi-steel making stays the method for making steel of slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210544071.9A CN103866077B (en) | 2012-12-14 | 2012-12-14 | The two slag of a kind of semi-steel making stays the method for making steel of slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103866077A CN103866077A (en) | 2014-06-18 |
| CN103866077B true CN103866077B (en) | 2015-09-16 |
Family
ID=50905076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210544071.9A Active CN103866077B (en) | 2012-12-14 | 2012-12-14 | The two slag of a kind of semi-steel making stays the method for making steel of slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103866077B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104017932B (en) * | 2014-06-19 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of the two slag steel-making of a kind of converter |
| CN104032063B (en) * | 2014-06-19 | 2016-08-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of semisteel converter steelmaking |
| CN104805249B (en) * | 2015-05-20 | 2016-10-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slags stay the slagging method of slag semi-steel making |
| CN104988274A (en) * | 2015-07-02 | 2015-10-21 | 首钢总公司 | Slagging process for low-phosphorus steel smelting through converter |
| CN105483313A (en) * | 2016-01-16 | 2016-04-13 | 河北钢铁股份有限公司承德分公司 | Semi-steel making method |
| CN107034334A (en) * | 2017-05-10 | 2017-08-11 | 攀钢集团攀枝花钢铁研究院有限公司 | The double slag melting methods of half steel of the quick slagging of falling stove |
| CN110564908A (en) * | 2019-10-10 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | double-slag dephosphorization and steel-making method for semisteel converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597664A (en) * | 2009-06-18 | 2009-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of oxygen top blown converter steel making |
| CN102071277A (en) * | 2010-12-23 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Converter dephosphorizing and steelmaking method |
| CN102220453A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Dephosphorization method of semi-steel |
| CN102329921A (en) * | 2011-09-30 | 2012-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel making method |
-
2012
- 2012-12-14 CN CN201210544071.9A patent/CN103866077B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597664A (en) * | 2009-06-18 | 2009-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of oxygen top blown converter steel making |
| CN102071277A (en) * | 2010-12-23 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Converter dephosphorizing and steelmaking method |
| CN102220453A (en) * | 2011-06-22 | 2011-10-19 | 攀钢集团有限公司 | Dephosphorization method of semi-steel |
| CN102329921A (en) * | 2011-09-30 | 2012-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel making method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103866077A (en) | 2014-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103866077B (en) | The two slag of a kind of semi-steel making stays the method for making steel of slag | |
| CN102071277B (en) | Converter dephosphorizing and steelmaking method | |
| CN102776313B (en) | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter | |
| CN103352101B (en) | Low-cost smelting technology of converter | |
| CN102212643A (en) | Converter less-slag smelting process | |
| CN105671248B (en) | A kind of smelting process of converter high efficiency dephosphorating | |
| CN103642971B (en) | Improve method and the Semi-steel making method of semi-steel making endpoint carbon content | |
| CN103194564A (en) | Process for producing ultra-low phosphorus steel | |
| CN105112599A (en) | Method for smelting ultra-low phosphorus steel | |
| CN104928431A (en) | Method for single slag smelting low-carbon high-phosphorus and high-weathering steel by adopting combined blown converter | |
| CN102559985A (en) | Method of smelting low-phosphorus steel through converter | |
| CN103627843B (en) | Semi-steel making slagging method and Semi-steel making method | |
| CN103627839B (en) | Semisteel steelmaking carbon content control method and semisteel steelmaking method | |
| CN103571999A (en) | Method for smelting nitrogen-controlling martensite stainless steel through total molten iron | |
| CN104060020B (en) | A kind of dephosphorization method for making steel improving converter terminal molten steel Fe content | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN103409595B (en) | Dephosphorization and steel-making method of vanadium-containing molten iron | |
| CN103627851B (en) | Semisteel steelmaking temperature control method and semisteel steelmaking method | |
| CN105132611A (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN103966399A (en) | Method of utilizing semisteel to smelt medium-carbon steel | |
| CN104109727B (en) | The method of half steel converter smelting Low-phosphorus Steel | |
| CN104263875A (en) | Dephosphorizing method for producing alloy weld line steel from high-phosphorus molten iron by top-blown converter | |
| CN104099443B (en) | CrMo steel waste material dephosphorization protects chromium smelting technology | |
| CN110564908A (en) | double-slag dephosphorization and steel-making method for semisteel converter | |
| CN115125354A (en) | Method for efficiently utilizing carbon dioxide by converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |