BRPI1004391A2 - development of sintered synthetic slag for the control of sulfur content of steels and alloys - Google Patents

development of sintered synthetic slag for the control of sulfur content of steels and alloys Download PDF

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Publication number
BRPI1004391A2
BRPI1004391A2 BRPI1004391-8A BRPI1004391A BRPI1004391A2 BR PI1004391 A2 BRPI1004391 A2 BR PI1004391A2 BR PI1004391 A BRPI1004391 A BR PI1004391A BR PI1004391 A2 BRPI1004391 A2 BR PI1004391A2
Authority
BR
Brazil
Prior art keywords
sulfur
steel
alloy
maximum
synthetic slag
Prior art date
Application number
BRPI1004391-8A
Other languages
Portuguese (pt)
Inventor
José Nolasco Sobrinho Pedro
Original Assignee
Vamtec S/A
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vamtec S/A filed Critical Vamtec S/A
Priority to BRPI1004391-8A priority Critical patent/BRPI1004391A2/en
Priority to PCT/BR2011/000197 priority patent/WO2011156881A1/en
Publication of BRPI1004391A2 publication Critical patent/BRPI1004391A2/en

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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C21C1/025—Agents used for dephosphorising or desulfurising
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/54—Processes yielding slags of special composition
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

DESENVOLVIMENTO DE ESCóRIA SINTéTICA SINTERIZADA PARA O CONTROLE DO TEOR DE ENXOFRE DE AçOS E LIGAS METáLICAS. A escória sintética sinterizada para o controle do teor de enxofre de aços e ligas que precisam manter na liga um determinado teor de enxofre sob controle proporciona melhor controle do teor de enxofre do aço ou liga no processo de fabricação destes materiais. Outros benéficos com a utilização do presente invento foram observados. Com a utilização do produto escória sintética sinterizada, objeto do pedido de patente: - eliminou-se adição de escória no processo através de ponte-rolante, passando a ser adotada a adição via silo devido á estabilidade da cal e demais componentes; - eliminou-se a adição da escória sintética não sinterizada anterior que continha enxofre na sua constituição, uma prática utilizada para minimizar o efeito da dessulfuração do aço durante o refino - não ocorreu a dessulfuração do metal(retirada de enxofre) devido à cal estar quimicamente combinada com outros componentes como o SiO~2~ e o Fe~2~O~3~, possibilitando melhor, mais fácil controle e estreitamento da faixa do enxofre do aço e economia na adição de ligas à base de enxofre para ajuste fino deste elemento durante a fabricação do aço. Com isso, o tempo para o processamento do aço diminui; - reduziu-se em 100% o risco de sucateamento de corridas teor de enxofre fora de faixa durante a fabricação de aço ou liga, devido à estabilidade alcançada para o enxofre durante a produção do aço ou liga. - atingiu-se menor perda de temperatura e menor consumo de gases inertes utilizados na fabricação do aço ou liga, pois quando a escória sintética sinterizada é adicionada junto com a liga, passa-se gás na panela uma única vez e não duas vezes como anteriormente; - os teores de alumínio final no aço GO foram reduzidos devido maior pureza do presente invento, garantindo maior qualidade do aço e liga; - melhor a ajuste da composição química da escória global do processo, permitindo melhor controle da basicidade; - melhor controle do teor de MgO, permitindo menor desgaste do revestimento refratário da panela; - reduziu-se o consumo de ligas a base de enxofre como Fe-S para acerto do teor final de enxofre do aço ou liga; - conseguiu-se o estreitamento da faixa especificada para o elemento enxofre do aço ou liga devido a facilidade e controle proporcionados com a utilização do presente invento. A dita escória sintética sinterizada possui a seguinte especificação química e física: Elemento/Componente - Composição química(% em massa) CaO 20-65 MgO 25(máximo) SiO2 10 a 50; AI203 3,5 (máximo); Fe2O3 15(máximo) FeO 10(máximo) Enxofre(S) 1(máximo) Carbono(C) 1 (máximo) Especificação física 5 a 1OOmm - tolerância: 5,0% menor que 5mm e 5,0% maior que 1OOmm.DEVELOPMENT OF SYNTHESIZED SYNTHETIC SLAG FOR THE CONTROL OF THE SULFUR CONTENT OF ACOS AND METALLIC ALLOYS. Sintered synthetic slag for controlling the sulfur content of steels and alloys that need to keep a certain sulfur content under control provides better control of the sulfur content of steel or alloys in the manufacturing process of these materials. Other benefits with the use of the present invention have been observed. With the use of the sintered synthetic slag product, object of the patent application: - the addition of slag in the process was eliminated by overhead crane, and the addition via silo was adopted due to the stability of lime and other components; - the addition of the previous unsintered synthetic slag containing sulfur in its constitution was eliminated, a practice used to minimize the effect of steel desulphurization during refining - no metal desulphurization (sulfur removal) occurred due to lime being chemically combined with other components such as SiO ~ 2 ~ and Fe ~ 2 ~ O ~ 3 ~, enabling better, easier control and narrowing of the steel sulfur range and saving on the addition of sulfur-based alloys for fine adjustment of this element. during steelmaking. Thus, the time for steel processing decreases; - the risk of scrapping out-of-range sulfur runs during the manufacture of steel or alloy has been reduced by 100% due to the stability achieved for sulfur during the production of steel or alloy. - Lower temperature loss and lower consumption of inert gases used in the manufacture of steel or alloy were achieved, because when sintered synthetic slag is added together with the alloy, gas is passed into the pan once and not twice as before. ; - The final aluminum grades in GO steel have been reduced due to the higher purity of the present invention, ensuring higher quality of steel and alloy; - better adjustment of the chemical composition of the overall process slag, allowing better control of basicity; - better control of MgO content, allowing less wear of the pan refractory lining; - the consumption of sulfur-based alloys such as Fe-S was reduced to adjust the final sulfur content of the steel or alloy; Narrowing of the specified range for the sulfur element of the steel or alloy has been achieved due to the ease and control provided with the use of the present invention. Said sintered synthetic slag has the following chemical and physical specification: Element / Component - Chemical composition (% by mass) CaO 20-65 MgO 25 (maximum) SiO2 10 to 50; AI203 3.5 (maximum); Fe2O3 15 (maximum) FeO 10 (maximum) Sulfur (S) 1 (maximum) Carbon (C) 1 (maximum) Physical specification 5 to 100mm - tolerance: 5.0% less than 5mm and 5.0% greater than 100mm.

BRPI1004391-8A 2010-06-18 2010-06-18 development of sintered synthetic slag for the control of sulfur content of steels and alloys BRPI1004391A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BRPI1004391-8A BRPI1004391A2 (en) 2010-06-18 2010-06-18 development of sintered synthetic slag for the control of sulfur content of steels and alloys
PCT/BR2011/000197 WO2011156881A1 (en) 2010-06-18 2011-06-16 Development of synthetic sintered slag for controlling the sulphur content of steels and metal alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BRPI1004391-8A BRPI1004391A2 (en) 2010-06-18 2010-06-18 development of sintered synthetic slag for the control of sulfur content of steels and alloys

Publications (1)

Publication Number Publication Date
BRPI1004391A2 true BRPI1004391A2 (en) 2012-03-13

Family

ID=45347601

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI1004391-8A BRPI1004391A2 (en) 2010-06-18 2010-06-18 development of sintered synthetic slag for the control of sulfur content of steels and alloys

Country Status (2)

Country Link
BR (1) BRPI1004391A2 (en)
WO (1) WO2011156881A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN115976297B (en) * 2023-02-10 2025-05-02 山西太钢不锈钢股份有限公司 A method for rapid slag formation in short-process smelting of stainless steel with high surface quality
CN118326120B (en) * 2024-06-12 2024-10-25 中铝山西新材料有限公司 Method for producing steelmaking slag-forming accelerator and steelmaking slag-forming accelerator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU55577A1 (en) * 1967-03-20 1968-05-06
JPS5534653A (en) * 1978-08-31 1980-03-11 Sumitomo Metal Ind Ltd Synthetic slag making agent for steel making
US4853034A (en) * 1987-04-13 1989-08-01 Quigley Joseph R Method of ladle desulfurizing molten steel

Also Published As

Publication number Publication date
WO2011156881A1 (en) 2011-12-22

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B03A Publication of an application: publication of a patent application or of a certificate of addition of invention
B08F Application fees: dismissal - article 86 of industrial property law

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B08K Lapse as no evidence of payment of the annual fee has been furnished to inpi (acc. art. 87)

Free format text: EM VIRTUDE DO ARQUIVAMENTO PUBLICADO NA RPI 2343 DE 01-12-2015 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDO O ARQUIVAMENTO DO PEDIDO DE PATENTE, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013.