JPH01180941A - Manufacture of low-carbon ferrochrome - Google Patents
Manufacture of low-carbon ferrochromeInfo
- Publication number
- JPH01180941A JPH01180941A JP562788A JP562788A JPH01180941A JP H01180941 A JPH01180941 A JP H01180941A JP 562788 A JP562788 A JP 562788A JP 562788 A JP562788 A JP 562788A JP H01180941 A JPH01180941 A JP H01180941A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- low
- content
- burnt lime
- electric furnace
- 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.)
- Pending
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 18
- 229910000604 Ferrochrome Inorganic materials 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 29
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 12
- 239000000292 calcium oxide Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 20
- 239000011651 chromium Substances 0.000 claims description 20
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 238000009991 scouring Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 9
- 239000002994 raw material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 241000218691 Cupressaceae Species 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は電気炉による低炭素フェロクロムの製造法に係
り、ペラン法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing low carbon ferrochrome using an electric furnace, and relates to an improvement of the Perrin process.
［従来の技術］
低炭素フェロクロムは一般にペラン法によって製造され
ており、その製造方法は、クロム鉱石と媒溶材である焼
石灰を電気炉で溶解して一次スラグを生成させ、出湯し
てレードルに受けた後、還元剤としてシリコクロムを添
加してクロム鉱石中のＣｒ、Ｆｅの酸化物を還元し、Ｆ
ｅ−Ｃｒ合金とする方法である。[Prior art] Low-carbon ferrochrome is generally produced by the Perrin process, which involves melting chromium ore and burnt lime as a solvent in an electric furnace to generate primary slag, which is then tapped and poured into a ladle. After that, silicochrome is added as a reducing agent to reduce Cr and Fe oxides in the chromium ore, and
This is a method of making an e-Cr alloy.
Ｆｅ○・Ｃｒ２Ｏ３＋２８ｉ＝Ｆｅ Ｃｒ２ ＋２３
ｉ ０２
この反応は発熱反応であるなめ高温になり過き、レード
ルを損傷する等の問題を生する。そこで、この反応熱を
有効に利用するために、桧材としてクロム鉱石を追加装
入（以下、追装という）し、浴温を適度に制御しなから
、クロム鉱石をレードル内で溶解させ、電力原単位を低
減させる方法が採用されている。Fe○・Cr2O3+28i=Fe Cr2 +23
i 02 Since this reaction is an exothermic reaction, the temperature becomes too high, causing problems such as damage to the ladle. Therefore, in order to effectively utilize this reaction heat, chromium ore is additionally charged as cypress material (hereinafter referred to as additional charging), and the chromium ore is melted in the ladle while controlling the bath temperature appropriately. A method is adopted to reduce the electricity consumption rate.
［発明か解決しようとする課題］
しかし、従来技術による低炭素フェロクロムの製造にお
いては、Ｃ含有量が０．０２％以下の超低炭素フェロク
ロムを製造する場合には問題かあった。[Problems to be Solved by the Invention] However, in the production of low carbon ferrochrome according to the prior art, there were problems when producing ultra low carbon ferrochrome with a C content of 0.02% or less.
一次スラグは電気炉内で酸化されるので、−次スラグ中
のＣ残留量は約０．０３％以下にすることかでき、非常
に低くすることができるが、連装したクロム鉱石中のＣ
は約１０％程度か製品中に移行する。このため、製品中
のＣ含有量の低下には限界かあり、超低炭素フェロクロ
ムを安定して製造することは困難であった。このような
問題に対処し、その製造過程には種々の制約条件が設け
られている。Since the primary slag is oxidized in the electric furnace, the residual amount of C in the primary slag can be reduced to approximately 0.03% or less, which is extremely low.
Approximately 10% of the amount migrates into the product. For this reason, there is a limit to the reduction in C content in the product, and it has been difficult to stably produce ultra-low carbon ferrochrome. To deal with these problems, various constraints are set in the manufacturing process.
■原料は厳選し、Ｃ含有量の低いものを使用する。■Carefully select raw materials and use those with low C content.
■ｌ／−ドルのライニング材にはＣを放出しない材料を
使用する。■Use a material that does not emit C for the lining material of the l/- dollar.
上記のような制限条件を設けても、製品中のＣか０．０
２％以下になる割合（Ｃ合格率）は低く、また、炭素含
有量の低いクロム鉱石は高価であるのてコスト高になる
という問題もある。Even if the above limiting conditions are set, the C in the product will be 0.0
The ratio of 2% or less (C pass rate) is low, and there is also the problem that chromium ore with a low carbon content is expensive, resulting in high costs.
本発明は上述のような問題点を解決するためになされた
もので、炭素含有量の高いクロム鉱石を使用しても、炭
素含有量を極めて低くすることかできる低炭素フェロク
ロムの製造法を提供することを目的とする。The present invention was made to solve the above-mentioned problems, and provides a method for producing low-carbon ferrochrome that can reduce the carbon content to an extremely low level even when using chromium ore with a high carbon content. The purpose is to
［課題を解決するための手段］
本発明は、クロム鉱石と焼石灰を電気炉で溶解し、出湯
してレードルに受けた一次スラグに還元剤を添加して精
錬する低炭素フェロクロムの製造法において、前記一次
スラグに、電気炉でクロム鉱石と焼石灰を溶解して得た
合成スラグを還元剤と共に添加して精練することを特徴
とする低炭素フェロクロムの製造法である。[Means for Solving the Problems] The present invention provides a method for producing low carbon ferrochrome in which chromium ore and burnt lime are melted in an electric furnace, and a reducing agent is added to the primary slag that is tapped and received in a ladle for refining. , a method for producing low carbon ferrochrome, characterized in that synthetic slag obtained by dissolving chromium ore and burnt lime in an electric furnace is added to the primary slag together with a reducing agent and refined.
１作用］
電気炉でクロム鉱石と焼石灰を溶解して得た合成スラグ
（以下、合成スラグという）のＣ含有量は、クロム鉱石
中のＣ含有量か高くても非常に低い。このため、原料ク
ロム鉱石のＣ含有量が高い場合であっても、連装用原料
のクロム鉱石を前記合成スラグの状態にした後、一次ス
ラグに添加すれは、Ｃ含有量が低い製品を安定して製造
することかできる。1 Effect] The C content of synthetic slag (hereinafter referred to as synthetic slag) obtained by melting chromium ore and burnt lime in an electric furnace is very low, even if it is higher than the C content in chromium ore. Therefore, even if the raw material chromium ore has a high C content, adding it to the primary slag after converting the raw material chromium ore into the synthetic slag will not stabilize the product with a low C content. It can be manufactured using
［実施例］ 以下、本発明の実施例について説明する。[Example] Examples of the present invention will be described below.
（実施例）
先ず、第１表に記載した２種類のクロム鉱石と焼石灰を
６０００ ＫＶＡのスラグ溶解用３相エル−式電気炉で
溶解し、これを鋳込んで冷却した後、５ＩＩＩＩ１１以
下に破砕して合成スラグを調製した。(Example) First, two types of chromium ore and burnt lime listed in Table 1 were melted in a 6000 KVA three-phase L-type electric furnace for slag melting, and after being cast and cooled, the melting temperature was reduced to 5III11 or less. A synthetic slag was prepared by crushing.
この合成スラグの組成は第２表に示す。この表のことく
合成スラグのＣ含有量は００３％てあり、非常に低い値
であった。The composition of this synthetic slag is shown in Table 2. As shown in this table, the C content of the synthetic slag was 0.003%, which was a very low value.
次に、上述の合成スラグの製造と同一の方法によりクロ
ム鉱石と焼石灰を溶解して生成させた一次スラグをレー
ドルに受け、この−次スラグに、第４表に記載した配合
により、第２表の組成の合成スラグと第３表の組成の還
元剤であるシリコクロムおよび鉄源として低調鋼屑を添
加し、低炭素フェロクロムを製造した。この結果を第４
表に示す。第４表のことく、製品のＣ含有量は平均値か
０．０１５％であると共に、すべて試験における製品中
のＣ含有量か０．０２％以下てあり、Ｃ含有量０．２０
％以下であることを基準としたＣ合格率は１００％てあ
った。Next, the primary slag produced by melting chromium ore and burnt lime by the same method as for producing the synthetic slag described above is received in a ladle, and the secondary slag is mixed with the composition shown in Table 4. Low-carbon ferrochrome was produced by adding synthetic slag having the composition shown in Table 3, silicochrome as a reducing agent having the composition shown in Table 3, and low-grade steel scrap as an iron source. This result is the fourth
Shown in the table. Table 4 shows that the C content of the products is the average value of 0.015%, and the C content of the products in all tests is 0.02% or less, and the C content is 0.20%.
The C pass rate was 100%, based on the standard of % or less.
（比較例）
第１表の組成のクロム鉱石と焼石灰を３相エル−式電気
炉て溶解して生成させた一次スラグをレードルに受け、
この一次スラグに、前記のクロム鉱石と第３表の組成の
シリコクロムおよび鉄源を添加して低炭素フェロクロム
を製造した。この結果は第５表に示すように、製品中の
Ｃ含有量は平均値か００２１％と高く、実施例と同し基
準によるＣ合格率は３０％の低率であった。(Comparative example) Primary slag produced by melting chromium ore and burnt lime having the composition shown in Table 1 in a three-phase L-type electric furnace is received in a ladle,
To this primary slag, the above-mentioned chromium ore, silicochrome having the composition shown in Table 3, and an iron source were added to produce low carbon ferrochrome. As shown in Table 5, the C content in the product was high at an average value of 0.021%, and the C pass rate based on the same standards as in the example was low at 30%.
第１表 原料組成 （％）
第２表 合成スラグの組成（％）
第３表 シリコクロムの組成（％）
第４表 実施例の操業結果
第５表 比較例の操業結果
製品品位桐生Ｃ％における＊の表示はＣ含有量か不合格
であることを示す。Table 1 Raw material composition (%) Table 2 Composition of synthetic slag (%) Table 3 Composition of silicochrome (%) Table 4 Operation results of examples Table 5 Operation results of comparative examples Product grade Kiryu C%* The display indicates that the product has a high C content or is rejected.
Ｃ合格率は３０％である。The passing rate for C is 30%.
［発明の効果］
本発明によれは、Ｃ含有量が高いクロム鉱石を使用して
も、Ｃ含有量が極めて低い低炭素フェロクロムを安定し
て製造することかできる。[Effects of the Invention] According to the present invention, even if chromium ore with a high C content is used, low carbon ferrochrome with an extremely low C content can be stably produced.
Claims (1)
ルに受けた一次スラグに還元剤を添加して精錬する低炭
素フェロクロムの製造法において、前記一次スラグに、
電気炉でクロム鉱石と焼石灰を溶解して得た合成スラグ
を還元剤と共に添加して精練することを特徴とする低炭
素フェロクロムの製造法。A method for producing low carbon ferrochrome in which chromium ore and burnt lime are melted in an electric furnace, and a reducing agent is added to and refined the primary slag that is tapped and received in a ladle.
A method for producing low-carbon ferrochrome, which is characterized by adding synthetic slag obtained by melting chromium ore and burnt lime in an electric furnace together with a reducing agent and scouring it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP562788A JPH01180941A (en) | 1988-01-13 | 1988-01-13 | Manufacture of low-carbon ferrochrome |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP562788A JPH01180941A (en) | 1988-01-13 | 1988-01-13 | Manufacture of low-carbon ferrochrome |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01180941A true JPH01180941A (en) | 1989-07-18 |
Family
ID=11616392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP562788A Pending JPH01180941A (en) | 1988-01-13 | 1988-01-13 | Manufacture of low-carbon ferrochrome |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01180941A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007195802A (en) * | 2006-01-27 | 2007-08-09 | Noda Corp | Drawer device |
| JP2015175043A (en) * | 2014-03-17 | 2015-10-05 | Ｊｆｅマテリアル株式会社 | Manufacturing method of silicochromium and manufacturing method of ferrochromium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6237340A (en) * | 1985-08-12 | 1987-02-18 | Nippon Kokan Kk <Nkk> | Manufacture of low-nitrogen and low-carbon ferrochrome |
-
1988
- 1988-01-13 JP JP562788A patent/JPH01180941A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6237340A (en) * | 1985-08-12 | 1987-02-18 | Nippon Kokan Kk <Nkk> | Manufacture of low-nitrogen and low-carbon ferrochrome |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007195802A (en) * | 2006-01-27 | 2007-08-09 | Noda Corp | Drawer device |
| JP2015175043A (en) * | 2014-03-17 | 2015-10-05 | Ｊｆｅマテリアル株式会社 | Manufacturing method of silicochromium and manufacturing method of ferrochromium |
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