JPS62274018A - Method and apparatus for producing high-chromium alloy - Google Patents
Method and apparatus for producing high-chromium alloyInfo
- Publication number
- JPS62274018A JPS62274018A JP11489286A JP11489286A JPS62274018A JP S62274018 A JPS62274018 A JP S62274018A JP 11489286 A JP11489286 A JP 11489286A JP 11489286 A JP11489286 A JP 11489286A JP S62274018 A JPS62274018 A JP S62274018A
- Authority
- JP
- Japan
- Prior art keywords
- furnace body
- slag bath
- ore
- gas
- blowing
- 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
- 229910000599 Cr alloy Inorganic materials 0.000 title claims description 21
- 239000000788 chromium alloy Substances 0.000 title claims description 21
- 238000000034 method Methods 0.000 title description 2
- 239000002893 slag Substances 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 15
- 230000004907 flux Effects 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 239000011651 chromium Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 13
- 239000001301 oxygen Substances 0.000 abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 abstract description 13
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
３発明の詳細な説明
〔産業上の利用分野〕
この発明は例えば転炉型の炉体でＣｒ鉱石を溶融還元し
て高クロム合金を得る高クロム合金の製造方法及びその
装置、特にそのスラグ浴中のＣ「鉱石の還元効率の向上
に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] This invention relates to a method for producing a high chromium alloy, in which a high chromium alloy is obtained by melting and reducing Cr ore, for example, in a converter-type furnace body; The apparatus is concerned with improving the efficiency of reduction of C' ore in the slag bath.
高クロム合金は電気炉を用いて製造するのが一般的であ
ったが、電気炉では製造コストが高（なるという欠点が
ある。このため、最近では電気炉の代わりに、転炉型の
炉体を用いてＣｒ鉱石の溶融還元を行わせ、これによっ
て高クロム合金を得ろ高クロム合金製造装置が提案され
ている。High chromium alloys were generally manufactured using electric furnaces, but electric furnaces have the disadvantage of high manufacturing costs.For this reason, converter-type furnaces have recently been used instead of electric furnaces. An apparatus for producing a high chromium alloy has been proposed in which a high chromium alloy is obtained by melting and reducing Cr ore using a Cr ore.
第３図は従来の高クロム合金製造装置の説明図であり、
図において（１）は転炉型の炉体、（２）はこの炉体内
に保持された金属溶湯であろ鉄溶湯、（３）（よ炉体（
１）内にＣｒ鉱石、炭材及びフラックスを供給する原料
供給手段であるホッパー、（４）は炉体（１）内に上方
から酸素を吹き込む上吹きランス、（５）（よ鉄溶湯（
２）の上に形成されたスラグ浴、（６）は炉体（１）の
上部に斜め上方から炉体（１）内に向けた状態で取り付
けられている二次燃焼用羽口である。FIG. 3 is an explanatory diagram of a conventional high chromium alloy manufacturing equipment.
In the figure, (1) is a converter-type furnace body, (2) is the molten metal or iron held in this furnace body, and (3) is the converter body (
1) A hopper which is a raw material supply means for supplying Cr ore, carbonaceous materials and flux into the furnace body (1), (4) a top-blowing lance which blows oxygen into the furnace body (1) from above, (5) (molten steel (
The slag bath formed above 2) and tuyere (6) for secondary combustion are attached to the upper part of the furnace body (1) so as to face diagonally into the furnace body (1) from above.
従来の高クロム合金製造装置は上記のように構成され、
あらかじめ炉体（１）内に鉄溶湯（５）を入れておき、
ホッパー（５）から炉体（１）内にＣｒ鉱石、炭材及び
フラッスを供給し、上吹きランス（４）から炉体（１）
内に酸素を吹き込ませ、更に二次燃焼用羽口（６）から
酸素を吹き込ませると、炭材が上吹きランス（４）から
炉体（１）内に吹き込ませた酸素により一次燃焼し、こ
の−火燃焼により発生したＣｏガスが二次燃焼用羽口（
６）から吹き込ませた酸素によって二次燃焼し、これら
の−次、二次燃焼によって発生した多量の熱によってス
ラグ浴（５）中のＣｒ鉱石が還元されて金属クロムとな
り、この金属クロムと鉄溶湯（２）とによって高クロム
合金が生成される。Conventional high chromium alloy manufacturing equipment is configured as above,
Put molten iron (5) into the furnace body (1) in advance,
Cr ore, carbonaceous materials and flash are supplied from the hopper (5) into the furnace body (1), and from the top blowing lance (4) the furnace body (1) is fed.
When oxygen is blown into the furnace body and oxygen is further blown from the secondary combustion tuyere (6), the carbonaceous material is primarily combusted by the oxygen blown into the furnace body (1) from the top blowing lance (4). The Co gas generated by this -flame combustion is transferred to the secondary combustion tuyeres (
Secondary combustion occurs due to the oxygen blown into the slag bath (5), and the large amount of heat generated by these secondary combustions reduces the Cr ore in the slag bath (5) to metallic chromium, and this metallic chromium and iron A high chromium alloy is produced by the molten metal (2).
〔発明が解決しようとする問題点〕
上記のような従来の高クロム合金製造装置では、スラグ
浴（５）の熱伝導率があまり良くないので、−次、二次
燃焼によって発生した熱がスラグ浴（５）へ効率良く伝
わらず、これらの熱が溶融還元のために有効利用されず
、炭材が必要以上に消費され、又、精錬時間が必要以上
に長くなり、このため、高クロム合金の製造コストが必
要以上に高くなっているという問題点がある。[Problems to be solved by the invention] In the conventional high chromium alloy production equipment as described above, the thermal conductivity of the slag bath (5) is not very good, so the heat generated by secondary combustion is transferred to the slag. The heat is not efficiently transferred to the bath (5), the heat is not effectively used for melting and reduction, the carbonaceous material is consumed more than necessary, and the refining time is longer than necessary. The problem is that the manufacturing cost is unnecessarily high.
この発明は、かかる問題点を解決するためになされたも
ので、発生した熱のスラグ浴（５）への伝熱効率を高め
、又、Ｃｒ鉱石と炭材との反応界面積を増大させ、炭材
の消費量を減少させ、高クロム合金の製造コストを低減
させることができる高クロム合金の製造方法及びその装
置を得ることを目的とする。This invention was made to solve these problems, and it increases the heat transfer efficiency of the generated heat to the slag bath (5), increases the reaction interface area between Cr ore and carbon material, and improves the efficiency of heat transfer to the slag bath (5). The present invention aims to provide a method for manufacturing a high chromium alloy and an apparatus therefor, which can reduce the consumption of materials and the manufacturing cost of the high chromium alloy.
この発明に係る高クロム合金の製造方法は、炉体内に形
成されたスラグ浴へガスを吹き込んでスラグ浴を撹拌さ
せることを特徴とするものである。The method for producing a high chromium alloy according to the present invention is characterized in that the slag bath is stirred by blowing gas into the slag bath formed in the furnace body.
また、この発明に係る高クロム合金の製造装置は、金属
溶湯を保持する転炉型の炉体と、該炉体内にＣｒ鉱石、
炭材及びフラックスを供給する原料供給手段と、該炉体
内に酸化性ガスを吹き込む上吹きランスと、該炉体内に
酸化性ガスを該上吹きランスと別に吹き込んで該炉体内
のＣｏガスを二次燃焼させる二次燃焼用羽口とを備えた
高クロム合金製造装置において、該炉体内に形成された
スラグ浴へガスを吹き込んでスラグ浴を撹拌させる槽吹
き羽口を該炉体の側壁に設けたものである。Further, the high chromium alloy manufacturing apparatus according to the present invention includes a converter-type furnace body that holds molten metal, and a Cr ore inside the furnace body.
A raw material supply means for supplying carbon material and flux, a top blowing lance for blowing oxidizing gas into the furnace body, and a top blowing lance for blowing oxidizing gas into the furnace body separately from the top blowing lance to remove Co gas in the furnace body. In a high chromium alloy production equipment equipped with secondary combustion tuyere for subsequent combustion, a tank blowing tuyere for blowing gas into the slag bath formed in the furnace body to agitate the slag bath is installed on the side wall of the furnace body. It was established.
この発明においては、横吹き羽口からスラグ浴内にガス
を吹き込むと、このガスにより該炉体内のスラグ浴が撹
拌され、−次、二次燃焼によって発生した多量の熱が効
率良くスラグ浴に伝えられ、又、Ｃｒ鉱石と炭材との反
応接触面積が増大させられ、その結果、Ｃｒ鉱石が効率
良く還元させられる。In this invention, when gas is blown into the slag bath from the side blowing tuyere, the slag bath inside the furnace body is stirred by this gas, and a large amount of heat generated by secondary combustion is efficiently transferred to the slag bath. In addition, the reaction contact area between the Cr ore and the carbonaceous material is increased, and as a result, the Cr ore is efficiently reduced.
第１図はこの発明の一実施例を示す説明図であ’） 、
（１１〜（６）は上記従来装置と全く同一のものである
。（７）は炉体（１）の側部のスラグ浴高さ位置に取り
付けられている横吹き羽口、（８）は炉体（１）の底部
に取り付けられている底吹き羽口である。FIG. 1 is an explanatory diagram showing one embodiment of the present invention.
(11 to (6) are completely the same as the above conventional device. (7) is a side blowing tuyere attached to the side of the furnace body (1) at the height of the slag bath, and (8) is This is a bottom blowing tuyere attached to the bottom of the furnace body (1).
上記のように構成された高クロム合金製造装置において
、炉体（１）内にホッパー（３）からＣｒ鉱石、炭材お
よびフラックスを供給すると共に、上吹きランス（４）
及び二次燃焼用羽口（６）から酸素を吹き込み、横吹き
羽口（７）からスラグ浴（５）内に酸素、空気又は窒素
ガスを吹き込むと、このガスによって炉体（１）内のス
ラグ浴（５）が撹拌され、−次、二次燃焼によって発生
した多量の熱が効率良くスラグ浴（５）に伝えられ、又
、スラグ浴（５）中のＣｒ鉱石と炭材との反応接触面積
が増大し、Ｃｒｇ石が効率良く還元される。In the high chromium alloy manufacturing apparatus configured as described above, Cr ore, carbonaceous material, and flux are supplied from the hopper (3) into the furnace body (1), and the top blowing lance (4)
When oxygen is blown into the secondary combustion tuyere (6) and oxygen, air or nitrogen gas is blown into the slag bath (5) through the side blow tuyere (7), the gas inside the furnace body (1) is The slag bath (5) is stirred, and then a large amount of heat generated by secondary combustion is efficiently transferred to the slag bath (5), and the reaction between Cr ore and carbonaceous material in the slag bath (5) The contact area increases and Crg stone is efficiently reduced.
なお、上記二次燃焼用羽口（７）から炉体（１）内に酸
素を吹き込む場合のＯＤ比は≧０．４とするのがよい。Note that when oxygen is blown into the furnace body (1) from the secondary combustion tuyere (7), the OD ratio is preferably ≧0.4.
ここで、ＯＤ比とは、炉内雰囲気ガス中のＣＯ□量＋ｃ
ｏ量に対する炉内雰囲気ガス中のＣＯ□量の比率をいう
。Here, the OD ratio is the amount of CO□ in the furnace atmosphere gas + c
It refers to the ratio of the amount of CO□ in the furnace atmosphere gas to the amount of CO.
又、横吹き羽口（７）からのガス吹き込みにより、スラ
グ浴（５）への伝熱が良くなるが、これによってスラグ
浴（５）の温度が必要以上に上昇すると、耐火物の溶損
が多くなることになる。このため、スラグ浴（５）の温
度が必要以上に上昇する場合は、耐火物の溶損を防止す
るため、底吹き羽口（８）から鉄溶湯（２）へガスを吹
き込んで、鉄溶湯（２）を撹拌させ、スラグ浴（５）の
熱を鉄溶湯（２）へ効率浴伝えさせ、スラグ浴（５）の
温度を低下させる必要がある。In addition, gas blowing from the side blowing tuyeres (7) improves heat transfer to the slag bath (5), but if this causes the temperature of the slag bath (5) to rise more than necessary, it may cause melting of the refractories. will increase. Therefore, if the temperature of the slag bath (5) rises more than necessary, gas is blown into the molten iron (2) from the bottom blowing tuyeres (8) to prevent melting of the refractories. It is necessary to stir the slag bath (2), efficiently transfer the heat of the slag bath (5) to the molten iron (2), and lower the temperature of the slag bath (5).
実験例
容１５０トンの炉体に横吹き羽口（７）を取り付け、上
吹きランス（４）から酸素を９００ＯＮｍ”／Ｈｒで吹
き込ませ、二次燃焼用羽口（６）から酸素を５４０ＯＮ
ｍ／Ｈｒで吹き込ませ、ＯＤ比≧０４とし、ホッパー（
３）から炉体（１）内にＣｒｗ１石を４９０ｋｇ／ｗｉ
ｎ、 コークスを２８０ ｋｇ／＋ ｉ ｎ供給し、横
吹き羽口（７）から４５００ Ｎｍ／Ｈｒの酸素を吹き
込ませ、底吹き羽口（８）から２００ＯＮｒｎ’／Ｈｒ
の酸素を吹き込ませて溶融還元の実験をし、慣吹き羽口
（７）からのガス吹き込み量と着熱効率との関係を求め
たところ、第２図に示すとおりとなった。Experimental example A side blow tuyere (7) was attached to a 150 ton furnace body, oxygen was blown at 900 ONm''/Hr from the top blow lance (4), and 540 ON was blown from the secondary combustion tuyere (6).
Blow at a rate of m/Hr, set the OD ratio≧04, and use a hopper (
From 3), 490 kg/wi of Crw1 stone was placed in the furnace body (1).
280 kg/+ i n of coke was supplied, 4500 Nm/Hr of oxygen was blown from the side blowing tuyere (7), and 200 Nm/Hr was blown from the bottom blowing tuyere (8).
A melting reduction experiment was conducted by blowing in oxygen, and the relationship between the amount of gas blown from the conventional blowing tuyere (7) and the heat transfer efficiency was determined, and the result was as shown in Figure 2.
この実験により、横吹き羽口（７）によるガス吹き込み
がスラグ浴（５）への着熱効率を良好ならしめているこ
とがわかる。This experiment shows that the gas blowing through the side blowing tuyere (7) improves the heat transfer efficiency to the slag bath (5).
この発明は以上説明したとおり、炉体内で発生した熱を
スラグ浴へ効率良く伝え、またＣｒｇ石と炭材との接触
を良好ならしめ、Ｃｒ鉱石の還元効率を良好ならしめた
ので、還元のための炭材の消費量が減少し、高クロム合
金を安価に製造することができるという効果がある。As explained above, this invention efficiently transfers the heat generated in the furnace to the slag bath, improves the contact between the Crg stone and the carbon material, and improves the reduction efficiency of the Cr ore. This has the effect of reducing the amount of carbonaceous material consumed and making it possible to produce high chromium alloys at low cost.
第１図はこの発明の一実施例を示す説明図、第２図は槽
吹き羽口によるガス吹き込み量と着熱効率との関係を示
すグラフ、第３図は従来の高クロム合金製造装置の説明
図である。
図において、（１）は炉体、（２）は鉄溶湯、（３）は
ホッパー、（４）は上吹きランス、（５）はスラグ浴、
（６）は二次燃焼用羽口、（７）は横吹き羽口、（８）
は底吹き羽口である。
なお、各図中同一符号は同一または相当部分を示す。Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is a graph showing the relationship between the amount of gas blown by the tank blowing tuyere and heat transfer efficiency, and Fig. 3 is an explanation of a conventional high chromium alloy manufacturing apparatus. It is a diagram. In the figure, (1) is the furnace body, (2) is the molten iron, (3) is the hopper, (4) is the top blowing lance, (5) is the slag bath,
(6) is a secondary combustion tuyere, (7) is a side blowing tuyere, (8)
is a bottom-blown tuyere. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (2)
スラグ浴を撹拌させることを特徴とする高クロム合金の
製造方法。(1) A method for producing a high chromium alloy, which comprises stirring the slag bath by blowing gas into the slag bath formed in the furnace body.
Ｃｒ鉱石、炭材及びフラックスを供給する原料供給手段
と、該炉体内に酸化性ガスを吹き込む上吹きランスと、
該炉体内に酸化性ガスを該上吹きランスと別に吹き込ん
で該炉体内のＣＯガスを二次燃焼させる二次燃焼用羽口
とを備えた高クロム合金製造装置において、該炉体内に
形成されたスラグ浴へガスを吹き込んでスラグ浴を撹拌
させる横吹き羽口を該炉体の側壁に設けたことを特徴と
する高クロム合金の製造装置。(2) a converter-type furnace body that holds molten metal; a raw material supply means that supplies Cr ore, carbonaceous material, and flux into the furnace body; and a top blow lance that blows oxidizing gas into the furnace body;
In a high chromium alloy production apparatus equipped with a secondary combustion tuyere for secondary combustion of CO gas in the furnace body by blowing oxidizing gas into the furnace body separately from the top blow lance, 1. An apparatus for producing a high chromium alloy, characterized in that a side blowing tuyere for blowing gas into a slag bath to agitate the slag bath is provided on the side wall of the furnace body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489286A JPS62274018A (en) | 1986-05-21 | 1986-05-21 | Method and apparatus for producing high-chromium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489286A JPS62274018A (en) | 1986-05-21 | 1986-05-21 | Method and apparatus for producing high-chromium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62274018A true JPS62274018A (en) | 1987-11-28 |
Family
ID=14649260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11489286A Pending JPS62274018A (en) | 1986-05-21 | 1986-05-21 | Method and apparatus for producing high-chromium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62274018A (en) |
-
1986
- 1986-05-21 JP JP11489286A patent/JPS62274018A/en active Pending
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