CN102010931B - Slagging method for reducing inclusions in boiler refractory steel - Google Patents
Slagging method for reducing inclusions in boiler refractory steel Download PDFInfo
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- CN102010931B CN102010931B CN201010509013A CN201010509013A CN102010931B CN 102010931 B CN102010931 B CN 102010931B CN 201010509013 A CN201010509013 A CN 201010509013A CN 201010509013 A CN201010509013 A CN 201010509013A CN 102010931 B CN102010931 B CN 102010931B
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention relates to a slagging method for reducing inclusions in boiler refractory steel, belonging to the technical field of boiler refractory steel smelting. The invention is characterized by providing synthetic slag which contains 50-60% of CaO, 10-12% of SiO2 and 24-26% of Al2O3. The method comprises the following steps: (1) after discharging steel out of the electric furnace, adding aluminium wires in molten steel based on that 0.8kg of aluminium wires is added in per ton of molten steel; (2) before pouring the molten steel into a ladle, adding lime and synthetic slag into the ladle based on that 10kg of lime and 5kg of synthetic slag are added in per ton of molten steel; (3) after the ladle enters the refinement station, adding lime and synthetic slag into molten steel based on that 5kg of lime and 2.5kg of synthetic slag are added into per ton of molten steel, electrifying for 5 minutes, and adding aluminium powder and silico-calcium powder which are evenly mixed into molten steel base on that 1.75kg of aluminium powder and 0.9kg of silico-calcium powder are added into per ton of molten steel; (4) after adjusting the alloying ingredients according to technological requirements, adding lime and synthetic slag into molten steel base on that 5kg of lime and 2.5kg of synthetic slag are added into per ton of molten steel, electrifying for 5 minutes, adding aluminium powder and silico-calcium powder into molten steel based on that 1.75kg of aluminium powder and 0.9kg of silico-calcium powder is added in per ton of molten steel, electrifying for 30 minutes, and discharging the steel; and (5) 5 minutes before discharging the steel, adding silica into molten steel based on that 0.8kg of silica is added into per ton of molten steel.
Description
Technical field:
The invention belongs to boiler heat resisting smelting steel technical field, be specifically related to a kind of slagging method that reduces the boiler heat resisting steel inclusion.
Technical background:
When smelting the boiler heat resisting steel, be in smelting process, in steel, to add CaO-SiO both at home and abroad to how reducing the method that steel inclusion adopts
2Slag system, the shortcoming that this method exists are that the adsorptive power of slag is poor, cause the boiler heat resisting steel inclusion severe overweight of producing, and cause a large amount of waste products.
Summary of the invention:
The object of the invention provides a kind of new slag system and slagging method, can overcome the shortcoming that prior art exists effectively.
Characteristics of the present invention provide a kind of CaO-SiO
2-Al
2O
3It is that to contain CaO be 50%～60% that new slag system, its composition constitute, and contains SiO
2Be 10%～12%, contain Al
2O
3Be 24%～26%, be called synthetic slag.
Concrete control method is: in whole smelting process, in molten steel, add aluminum steel 0.8kg/t, lime (20～22) kg/t, synthetic slag (10～12) kg/t, aluminium powder 3.5kg/t, silicon calcium powder (1.5～2) kg/t, silica 0.8kg/t, t representes steel per ton.
Lime is mixed according to (10～12) kg/t with synthetic slag according to (20～22) kg/t, be called slag charge, this slag charge is divided into three parts with the amount of lime 10kg/t+ synthetic slag 5kg/t, lime 5kg/t+ synthetic slag 2.5kg/t, lime 5kg/t+ synthetic slag 2.5kg/t; Divide and add for three times in the molten steel; Aluminium powder is pressed 3.5kg/t+ silicon calcium powder (1.5～2) kg/t mix, be called powder mix, be divided into two parts uniformly; Add in two batches in the molten steel, silica once adds in the molten steel by 0.8kg/t.
Time sequence and method that above-mentioned each material adds in the molten steel in smelting process are:
1. behind the electric furnace steel tapping, in molten steel, press 0.8kg/t adding aluminum steel.
2. before molten steel injects ladle, in ladle, add slag charge for the first time by lime 10kg/t+ synthetic slag 5kg/t.
3. molten steel injects ladle, get into the refining station after, send electric 5 minutes after adding slag charge for the second time by lime 5kg/t+ synthetic slag 2.5kg/t in the molten steel; Add first part of powder mix again; After being sprinkled upon powder mix on the slag equably, require the suitable argon pressure that reduces, be not advisable so that molten steel is exposed.
4. after having adjusted alloying constituent by processing requirement, in molten steel, add slag charge for the third time by lime 5kg/t+ synthetic slag 2.5kg/t, send electricity to add above-mentioned second part of powder mix after 5 minutes again, method is identical with first part, send electricity 30 minutes afterwards again, just allows tapping.
5. tapped preceding 5 minutes, and in molten steel, pressed 0.8kg/t adding silica again.
Advantage of the present invention and positively effect:
Adopt new slag system provided by the invention and control method, can make scrap rate is zero, has improved the yield rate of producing the boiler heat resisting steel greatly.After Taiyuan Iron and Steel Co. company adopted the inventive method in 2009, yield rate reached 100%.
Embodiment:
1. electric furnace steel tapping 60t molten steel adds aluminum steel 48kg.
2. before molten steel does not inject ladle, in ladle, add lime 600kg+ synthetic slag 300kg for the first time.
3. molten steel injects ladle, behind the entering refining station, in molten steel, adds slag charge for the second time: behind the lime 300kg+ synthetic slag 150kg; Send electricity 5 minutes; After being sprinkling upon aluminium powder 100kg+ silicon calcium powder 60kg on the slag equably again, suitably reduce the pressure of argon gas, not be advisable so that molten steel is exposed.
4. by after processing requirement adjust the steel alloy composition, adding lime 300kg adds synthetic slag 150kg in the molten steel again, send electric 5 minutes again after, again powder mix 100kg is added silicon calcium powder 60kg and is sprinkling upon above the slag equably.Equally, suitably reduce the pressure of argon gas, not be advisable, send electricity tapping in 30 minutes afterwards again so that molten steel is exposed.
5. tapped preceding 5 minutes, and in molten steel, added the 48kg silica again.
Claims (1)
1. a slagging method that reduces the boiler heat resisting steel inclusion is characterized in that the slag system that this method is utilized is CaO-SiO
2-Al
2O
3It is that to contain CaO be 50%～60% that slag system, its composition constitute, contain SiO
2Be 10%～12%, contain Al
2O
3Be 24%～26%, the characteristic of this method is that concrete operation method is in whole smelting process, will in molten steel, add aluminum steel 0.8kg/t, lime (20～22) kg/t, synthetic slag (10～12) kg/t, aluminium powder 3.5kg/t, silicon calcium powder (1.5～2) kg/t, silica 0.8kg/t, and lime (20～22) kg/t is mixed by (10～12) kg/t with synthetic slag; Be called slag charge; This slag charge is divided into three parts by the amount of lime 10kg/t+ synthetic slag 5kg/t, lime 5kg/t+ synthetic slag 2.5kg/t, lime 5kg/t+ synthetic slag 2.5kg/t, divides to add for three times in the molten steel, aluminium powder press the 3.5kg/t+ silicon calcium powder by (1.5～2) kg/t mixing; Be called powder mix; Be divided into two parts equably, add in two batches in the molten steel, silica once adds in the molten steel by 0.8kg/t; T representes steel per ton
Time sequence and method that above-mentioned each material adds in the molten steel in smelting process are:
1. behind the electric furnace steel tapping, in molten steel, press 0.8kg/t adding aluminum steel;
2. before molten steel injects ladle, in ladle, add slag charge for the first time by lime 10kg/t+ synthetic slag 5kg/t;
3. molten steel injects ladle; After getting into the refining station, add slag charge for the second time by lime 5kg/t+ synthetic slag 2.5kg/t in the molten steel after, send electric 5 minutes; Add first part of above-mentioned powder mix again; Powder mix is sprinkling upon above the slag equably, requires suitably to reduce argon pressure, be advisable to guarantee that molten steel is not exposed; :
4. after having adjusted the steel alloy composition by processing requirement, in molten steel, add slag charge for the third time by lime 5kg/t+ synthetic slag 2.5kg/t, send electricity to add second part of above-mentioned powder mix in 5 minutes again, method is identical with first part, send electricity just to allow tapping in 30 minutes afterwards again;
5. tapped preceding 5 minutes, and in steel, pressed 0.8kg/t adding silica again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010509013A CN102010931B (en) | 2010-10-13 | 2010-10-13 | Slagging method for reducing inclusions in boiler refractory steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010509013A CN102010931B (en) | 2010-10-13 | 2010-10-13 | Slagging method for reducing inclusions in boiler refractory steel |
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| CN102010931A CN102010931A (en) | 2011-04-13 |
| CN102010931B true CN102010931B (en) | 2012-09-05 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102373313A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | Electric furnace smelting stainless steel slagging method |
| CN111850241B (en) * | 2020-07-23 | 2021-10-19 | 芜湖县天海耐火炉料有限公司 | Sintered synthetic slag and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701281A (en) * | 2009-12-04 | 2010-05-05 | 石家庄钢铁有限责任公司 | Premelted refining slag for refining low-oxygen steel by converter |
| CN101724733A (en) * | 2009-12-22 | 2010-06-09 | 上海大学 | Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof |
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2010
- 2010-10-13 CN CN201010509013A patent/CN102010931B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701281A (en) * | 2009-12-04 | 2010-05-05 | 石家庄钢铁有限责任公司 | Premelted refining slag for refining low-oxygen steel by converter |
| CN101724733A (en) * | 2009-12-22 | 2010-06-09 | 上海大学 | Synthesized slag suitable for slag-metal applied electric field pollution-free deoxygenation and preparation method thereof |
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| CN102010931A (en) | 2011-04-13 |
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