BR112021024006A2 - Method for producing low carbon ferrochrome - Google Patents

Method for producing low carbon ferrochrome

Info

Publication number
BR112021024006A2
BR112021024006A2 BR112021024006A BR112021024006A BR112021024006A2 BR 112021024006 A2 BR112021024006 A2 BR 112021024006A2 BR 112021024006 A BR112021024006 A BR 112021024006A BR 112021024006 A BR112021024006 A BR 112021024006A BR 112021024006 A2 BR112021024006 A2 BR 112021024006A2
Authority
BR
Brazil
Prior art keywords
slag
low carbon
carbon ferrochrome
chromium
producing low
Prior art date
Application number
BR112021024006A
Other languages
Portuguese (pt)
Inventor
Hiroichi Sugimori
Masahiro Mori
Original Assignee
Jfe Mat Co Ltd
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 Jfe Mat Co Ltd filed Critical Jfe Mat Co Ltd
Publication of BR112021024006A2 publication Critical patent/BR112021024006A2/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

método para produzir ferrocromo de baixo teor de carbono. a presente invenção provê um método para produzir ferrocromo de baixo teor de carbono, dito método sendo capaz de aumentar o rendimento de cromo enquanto é capaz de evitar a geração de cromo hexavalente prejudicial em uma escória a ser descartada. o método para produzir ferrocromo de baixo teor de carbono de acordo com a presente invenção é provido de: uma primeira etapa (s1) em que minério de cromo e cal viva são fundidos em um forno elétrico; e uma segunda etapa (s2) em que uma matéria-prima fundida (doravante referida como uma escória primária) fundida na primeira etapa e um agente redutor são carregados em um recipiente de reação, de modo que ferrocromo de baixo teor de carbono e uma escória secundária com grau de basicidade (cao/sio2) ajustada para menos de 1,65 sejam produzidos. após transferir a escória secundária obtida na segunda etapa (s2) para um forno elétrico ou recipiente de reação, um agente redutor é carregado no mesmo de modo a produzir um metal contendo cromo e uma terceira escória (s3). a terceira escória é uma escória inofensiva em que o teor de óxido de cromo (porcentagem da fração mássica de cr2o3) é ajustado para igual ou menos de 1,4% da fração mássica e o grau de basicidade (cao/sio2) é ajustado para menos de 1,3.method for producing low carbon ferrochrome. The present invention provides a method for producing low carbon ferrochrome, said method being able to increase the yield of chromium while being able to prevent the generation of harmful hexavalent chromium in a slag to be discarded. the method for producing low carbon ferrochrome according to the present invention is provided with: a first step (s1) in which chromium ore and quicklime are melted in an electric furnace; and a second stage (s2) in which a molten feedstock (hereinafter referred to as a primary slag) molten in the first stage and a reducing agent are loaded into a reaction vessel, so that low carbon ferrochrome and a slag secondary with a degree of basicity (cao/sio2) adjusted to less than 1.65 are produced. after transferring the secondary slag obtained in the second step (s2) to an electric furnace or reaction vessel, a reducing agent is charged thereto to produce a chromium-containing metal and a third slag (s3). the third slag is a harmless slag in which the chromium oxide content (percentage of the cr2o3 mass fraction) is adjusted to equal or less than 1.4% of the mass fraction and the degree of basicity (cao/sio2) is adjusted to less than 1.3.

BR112021024006A 2019-07-12 2020-07-10 Method for producing low carbon ferrochrome BR112021024006A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019130324 2019-07-12
PCT/JP2020/026995 WO2021010311A1 (en) 2019-07-12 2020-07-10 Method for producing low carbon ferrochromium

Publications (1)

Publication Number Publication Date
BR112021024006A2 true BR112021024006A2 (en) 2022-02-01

Family

ID=74209811

Family Applications (1)

Application Number Title Priority Date Filing Date
BR112021024006A BR112021024006A2 (en) 2019-07-12 2020-07-10 Method for producing low carbon ferrochrome

Country Status (3)

Country Link
JP (2) JP7035280B2 (en)
BR (1) BR112021024006A2 (en)
WO (1) WO2021010311A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113444884B (en) * 2021-05-17 2022-11-01 攀钢集团攀枝花钢铁研究院有限公司 Preparation method of micro-carbon ferrochrome

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210816A (en) * 1975-07-16 1977-01-27 Showa Denko Kk Process for recovering low carbon ferro- chromium slag
JPS5989751A (en) * 1982-11-15 1984-05-24 Nippon Kokan Kk <Nkk> Production of ferrochromium
JPS6237340A (en) * 1985-08-12 1987-02-18 Nippon Kokan Kk <Nkk> Manufacture of low-nitrogen and low-carbon ferrochrome
SE466315B (en) * 1988-01-05 1992-01-27 Middelburg Steel & Alloys Pty PROCEDURES FOR SULFUR AND SILICON CONTROL IN PRE-CHROME PREPARATION
JPH0826431B2 (en) * 1991-08-26 1996-03-13 日本鋼管株式会社 Method for producing low carbon ferrochrome
AT407263B (en) 1999-04-22 2001-02-26 Holderbank Financ Glarus METHOD FOR REPRODUCING STEEL SLAG
EP1274870B1 (en) 2000-04-19 2005-01-19 Maxred (Proprietary) Limited Ferroalloy production
JP2002256323A (en) 2001-02-27 2002-09-11 Nippon Steel Corp Method for reforming roughly decarburized slag in molten stainless steel
JP5461146B2 (en) 2009-10-30 2014-04-02 Ｊｆｅマテリアル株式会社 Method for decarbonizing silicochrome

Also Published As

Publication number Publication date
JPWO2021010311A1 (en) 2021-11-18
JP2022048383A (en) 2022-03-25
WO2021010311A1 (en) 2021-01-21
JP7035280B2 (en) 2022-03-14

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