CN101294235B - Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization - Google Patents
Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization Download PDFInfo
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- CN101294235B CN101294235B CN2008100480906A CN200810048090A CN101294235B CN 101294235 B CN101294235 B CN 101294235B CN 2008100480906 A CN2008100480906 A CN 2008100480906A CN 200810048090 A CN200810048090 A CN 200810048090A CN 101294235 B CN101294235 B CN 101294235B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides composite slag which is used for smelting a stainless steel by using a return method and also used for desulfuration and dephosphorization at the same time. The composite slag comprises the components and proportioning by weight as follows: when the content of CaO is 1 part, BaO and/or BaCO3 is 0.6 to 1.8 parts, CaF2 and/or BaCl2 is 0.3 to 0.6 parts, and Fe2O3 is 0.01 to 0.15 parts. When limes are used as CaO material, the content of the CaO in the limes is more than 92 percent, the sulfur content is less than 0.025 percent, and the silicon dioxide content is less than 1 percent. The purity quotient of other components are demanded to reach more than 98 percent. The granularity of the composite slag is less than 1cm<3>.
Description
Technical field
The present invention relates to a kind of composite slag that is used for smelting stainless steel with back method at same time of desulfurization dephosphorization, be used for the composite slag of molten steel desulfurizing dephosphorization, belong to remelting of scrap smelting stainless steel technology.
Background technology
When adopting waste and old stainless steel in electric furnace, to smelt as raw material, owing to have a large amount of alloying elements in the waste and old stainless steel, if electrosmelting adopts conventional two slag oxidation methods, then a large amount of alloying elements is oxidized to be fallen, produce dystectic inclusion after the alloying element oxidation, it is dried that slag is returned, the mobile reduction, worsen smelting condition, be unfavorable for the removal of impurity element sulphur and phosphorus.
If raw material adopts waste and old stainless steel, the present general Returning blowing keto technique that adopts, be characterized in that arranged in the smelting process short oxidation period (≤10min), make oxidation sludge, make reducing slag again, the energy oxygen decarburization degass, is mingled with.But because this kind method dephosphorization is difficult,, directly is brought into down in the operation VOD stove and carries out external refining, increased the weight of the burden of external refining so the phosphorus in the furnace charge is difficult to remove.
At present, the molten steel that Returning blowing keto technique is smelted only reduces carbon content, removes portion gas and inclusion by carbon monoxide in floating-upward process simultaneously, and sulphur and phosphorus basically substitution VOD stove handle.
Summary of the invention
The objective of the invention is to propose a kind of remelting of scrap stainless steel smelting composite slag of desulfurization dephosphorization simultaneously that is used for, this composite slag can reduce the sulphur phosphorus content in the molten steel simultaneously under existing processing condition, keep a large amount of alloying elements that molten steel exists simultaneously.
Technical scheme of the present invention: its component formation of composite slag of the present invention and weight proportion are as follows: when CaO content is 1 part, and BaO and/or BaCO
30.6-1.8 part, CaF
2And/or BaCl
20.3-0.6 part, Fe
2O
30.10-0.15 part.
Each component purity requirement is as follows: when making the CaO raw material with lime, the content of CaO is greater than 92% in the lime, and sulphur content is less than 0.025%, and dioxide-containing silica is less than 1%.Other component requires purity more than 98%.
The composite slag of described desulfurization dephosphorization, the composite slag granularity is less than 1cm
3
Adopted oxygenant Fe among the present invention
2O
3, in this composite slag, adopt Fe
2O
3Play the effect of two aspects, in molten steel, produce certain oxygen gesture on the one hand, helping of one side slag, play the effect of fusing assistant, has good dephosphorizing simultaneously, but iron oxide content is too high, is unfavorable for the removal of sulphur in the molten steel, so the iron oxide content among the present invention is 0.10-0.15 part.
Adopted fusing assistant CaF among the present invention
2And CaCl
2, under the steel-making temperature, the BaO in the slag, CaO etc. all can not melt, and its fusing point is respectively 1920 ℃, and 2615 ℃, if there is not fusing assistant will influence sweetening effectiveness greatly, fusing assistant can reduce the fusing point of slag, improves liquidity.So adopted among the present invention and adopted two kinds of fusing assistants, CaF respectively
2And CaCl
2
The slag system that adopts among the present invention is CaO+BaO (BaCO
3) mix slag system, since the CaO of suitable proportioning, BaO (BaCO
3) have than independent CaO or BaO slag system higher desulfuration effect.
Beneficial effect of the present invention: composite slag of the present invention can effectively reduce the sulphur content and the phosphorus content of molten steel in the remelting of scrap smelting stainless steel electric furnace, avoided the oxidational losses of alloying element, alleviate the smelting burden for the VOD stove, shortened smelting cycle, improved productivity.
The smelting process of prior art can not be removed phosphoric in electric furnace, and after the composite slag among employing the present invention, can slough the sulphur phosphorus content more than 40% simultaneously, improves refining efficiency and productivity.Because the desulfurization dephosphorization rate improves the effect that is obtained, can compensate the consumption costs of composite slag.
Embodiment
Its component formation of composite slag of the present invention and weight proportion are as follows: when CaO content is 1 part, and BaO and/or BaCO
30.6-1.8 part, CaF
2And/or BaCl
20.3-0.6 part, Fe
2O
30.10-0.15 part.
Each component purity requirement is as follows: the content of CaO is greater than 92% in the lime, and sulphur content is less than 0.025%, and dioxide-containing silica is less than 1%.Other component requires purity more than 98%.
Embodiments of the invention see the following form:
| Numbering | CaO | BaO | BaCO 3 | CaF 2 | BaCl 2 | Fe2O 3 | The quantity of slag |
| Embodiment 1 | 1 | 1.8 | 0.6 | 0.10 | 12％ | ||
| Embodiment 2 | 1 | 0.7 | 0.3 | 0.10 | 12％ | ||
| Embodiment 3 | 1 | 1 | 0.3 | 0.12 | 12％ | ||
| Embodiment 4 | 1 | 0.6 | 0.55 | 0.11 | 12％ | ||
| Embodiment 5 | 1 | 0.8 | 0.4 | 0.15 | 12％ |
The foregoing description mixes according to proportioning raw materials, prepares composite slag, composite slag mean particle size＜1cm according to 120kg/t
3Composite slag and reducing slag basicity is greater than 3, and electric furnace adopts the operation of reduction blow oxygen, after pulling down oxidation sludge composite slag joined in the molten steel by the electric furnace charging hole and smelts.It is as follows that composite slag embodiment of the present invention carries out the industrial experiment result: (composite slag and refining slag add fashionable, and element component content is in the molten steel: C O.30-0.35%, and Si 0.25-0.30%, Mn 0.5-0.8%, Cr 16.5%, and Ni 8%, S 0.040%, and P 0.032%):
As seen from the above table, its desulfurization degree of composite slag of the present invention can reach 45-55%, has 40% desulfurization degree simultaneously.With reducing the desulfurization dephosphorization load of VOD external refining greatly, reduce the composite slag total flow simultaneously.
Claims (3)
1. composite slag that is used for smelting stainless steel with back method at same time of desulfurization dephosphorization is characterized in that: its component constitute and weight proportion as follows: when CaO content is 1 part, BaO and/or BaCO
30.6-1.8 part, CaF
2And/or BaCl
20.3-0.6 part, Fe
2O
30.10-0.15 part.
2. the composite slag that is used for smelting stainless steel with back method at same time of desulfurization dephosphorization as claimed in claim 1 is characterized in that, when making the CaO raw material with lime, the content of CaO is greater than 92% in the lime, and sulphur content is less than 0.025%, and dioxide-containing silica is less than 1%.
3. the composite slag that is used for smelting stainless steel with back method at same time of desulfurization dephosphorization as claimed in claim 1 or 2 is characterized in that, BaO, BaCO
3, CaF
2, BaCl
2, Fe
2O
3Purity more than 98%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100480906A CN101294235B (en) | 2008-06-19 | 2008-06-19 | Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100480906A CN101294235B (en) | 2008-06-19 | 2008-06-19 | Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101294235A CN101294235A (en) | 2008-10-29 |
| CN101294235B true CN101294235B (en) | 2010-12-08 |
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ID=40064766
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|---|---|---|---|
| CN2008100480906A Active CN101294235B (en) | 2008-06-19 | 2008-06-19 | Composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212647A (en) * | 2011-04-29 | 2011-10-12 | 马鞍山中冶钢铁冶金高新技术有限公司 | Anti-rephosphorization gent made from composite basic oxide and used for molten steel secondary refining |
| CN104673970B (en) * | 2015-02-09 | 2017-01-11 | 东北大学 | Oxidizing dephosphorization method for high-silicon high-phosphorus chromium-nickel-containing molten iron |
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2008
- 2008-06-19 CN CN2008100480906A patent/CN101294235B/en active Active
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Effective date of registration: 20170620 Address after: 430074, No. 16 Guan Shan Road, East Lake hi tech Development Zone, Hongshan District, Hubei, Wuhan Patentee after: Wuhan Steel Engineering Technology Group Communication Co., Ltd. Address before: 430083 patent room, Wuhan Science and technology innovation department, No. 2, gate, Gate No. 3, Qingshan District, Wuhan, Hubei Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Address after: 430084 floor 15-22, building 4, Wuhan International Steel Logistics Service Center (Ganggu), Qingshan Town, Qingshan District, Wuhan City, Hubei Province Patentee after: Baoxin software (Wuhan) Co., Ltd Address before: 430074 No. 16 Guan Shan Road, East Lake hi tech Zone, Hongshan District, Wuhan, Hubei Patentee before: Wuhan Steel Engineering Technology Group Communication Co., Ltd. |