JPS62274019A - Production of high-chrominum alloy - Google Patents
Production of high-chrominum alloyInfo
- Publication number
- JPS62274019A JPS62274019A JP11489386A JP11489386A JPS62274019A JP S62274019 A JPS62274019 A JP S62274019A JP 11489386 A JP11489386 A JP 11489386A JP 11489386 A JP11489386 A JP 11489386A JP S62274019 A JPS62274019 A JP S62274019A
- Authority
- JP
- Japan
- Prior art keywords
- ore
- furnace body
- slag bath
- carbonaceous material
- oxygen
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000956 alloy Substances 0.000 title 1
- 229910045601 alloy Inorganic materials 0.000 title 1
- 239000002893 slag Substances 0.000 claims abstract description 34
- 238000007664 blowing Methods 0.000 claims abstract description 30
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 230000004907 flux Effects 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims description 28
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 15
- 239000000788 chromium alloy Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 20
- 239000007789 gas Substances 0.000 abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 14
- 239000001301 oxygen Substances 0.000 abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 abstract description 14
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000003756 stirring Methods 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ろ方法、特にこの溶融還元によって
形成されたスラグ浴におけろＣｒ鉱石の１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 provides a method for obtaining a high chromium alloy by melting and reducing Cr ore, for example, in a converter type furnace body, and in particular, a method for obtaining a high chromium alloy by this melting and reduction. The present invention relates to improving the monomer efficiency of Cr ore in the formed 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くなるという欠点が
ある。このなめ、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る方法が提案されている。High chromium alloys have generally been manufactured using electric furnaces, but electric furnaces have the disadvantage of high manufacturing costs. In view of this, recently a method has been proposed in which a converter type furnace body is used instead of an electric furnace to melt and reduce Cr ore, thereby obtaining a high chromium alloy.
第１図は転炉型の炉体を用いた高クロム合金の製造方法
を説明するための説明図であり、図において（１１は転
炉型の炉体、（２）はこの炉体内に保持された金属溶湯
である鉄溶湯、（３１Ｉ−１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）は鉄溶湯（２）の上に形成された
スラグ浴、（６）は炉体（１→内に酸素を吹き込ませる
二次燃焼用羽口、（７）は炉体（１）の側壁部のスラグ
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。Figure 1 is an explanatory diagram for explaining the method for manufacturing high chromium alloy using a converter-type furnace body. In the figure (11 is a converter-type furnace body, (2) is a Molten iron, which is molten metal, (Cr ore in the 31I-1 furnace body (1),
A hopper is a raw material supply means for supplying carbonaceous material and flux, (4) is a top blowing lance that blows oxygen into the furnace body (1) from above, and (5) is a slag formed on the molten iron (2). (6) is a secondary combustion tuyere for blowing oxygen into the furnace body (1), (7) is a side blower installed on the side wall of the furnace body (1) at the height of the slag bath. The mouth (8) is a bottom blowing tuyere attached to the bottom of the furnace body (1).
ここで、高クロム合金は息下のようにして製造される。Here, high chromium alloys are manufactured in a similar manner.
すなわち、あらかじめ炉体（１）内に鉄溶湯（５）を入
れておき、ホッパー（３）から炉体（１）内にＣｒ鉱石
、炭材及びフラックスを供給し、上吹きランス（４）か
ら炉体（１）内に酸素を吹き込ませるとともにに二次燃
焼用羽口（６）から酸素を吹き込ませてＯＤ比≧０．４
とさせると、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、一方、横吹き羽口
（７）から吹き込まれたガスによってスラグ浴（５）が
撹拌され、これによってスラグ浴（５）が−次、二次燃
焼によって発生した多量の熱を捕えて高温となり、スラ
グ浴（５）中のＣｒ鉱石が還元されて金属クロムが生成
し、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。ここで、ｄＤ比とは炉内雰囲気ガス
中のＣＯ量＋ＣＯ量に対する炉内雰囲気ガス中のＣＯ量
の比率をいう。That is, molten iron (5) is placed in the furnace body (1) in advance, Cr ore, carbonaceous material, and flux are supplied into the furnace body (1) from the hopper (3), and then molten iron (5) is fed into the furnace body (1) from the top blowing lance (4). Oxygen is blown into the furnace body (1) and also from the secondary combustion tuyeres (6) to achieve an OD ratio of 0.4.
When this happens, the carbon material flows from the top blowing lance (4) to the furnace body (1).
The CO gas generated by this flame combustion is subjected to secondary combustion by the oxygen blown into the secondary combustion tuyere (6), while the side blow tuyere (7) The slag bath (5) is stirred by the gas blown into the slag bath (5), and as a result, the slag bath (5) captures a large amount of heat generated by the secondary combustion and becomes high temperature, and the Cr ore in the slag bath (5) is heated. is reduced to produce metallic chromium, and a high chromium alloy is produced by this metallic chromium and the molten iron (2). Here, the dD ratio refers to the ratio of the amount of CO in the furnace atmosphere gas to the amount of CO in the furnace atmosphere gas+the amount of CO.
また、−次、二次燃焼により発生した熱によってスラグ
浴（５）の温度が必要以上に上昇し、耐火物の溶損量が
多くなるので、スラグ浴（５）の過熱を防止し、耐火物
の溶損量を減少させるため、底吹き羽口（８）を設け、
ここから鉄溶湯（２）へガスを吹き込ませて鉄溶湯（２
）を攪拌させ、スラグ浴（５）の熱を鉄溶湯（２）へ効
率よく伝えさせている。In addition, the temperature of the slag bath (5) rises more than necessary due to the heat generated by secondary combustion, and the amount of erosion of the refractory increases, so overheating of the slag bath (5) is prevented, In order to reduce the amount of material erosion, a bottom blowing tuyere (8) is installed.
From here, gas is blown into the molten iron (2).
) is stirred to efficiently transfer the heat of the slag bath (5) to the molten iron (2).
上記のような従来の高クロム合金の製造方法では、−次
、二次燃焼によって発生した多量の熱がスラグ浴（５）
全体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（なっているという問題点
がある。In the conventional manufacturing method for high chromium alloys as described above, a large amount of heat generated by secondary combustion is transferred to the slag bath (5).
The heat is not efficiently transmitted to the entire body, and this heat is not effectively used for melting and reduction, resulting in more carbon material being consumed than necessary, and the refining time becoming longer than necessary, which reduces the manufacturing cost of high chromium alloys. There is a problem that the value is higher than necessary.
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、発生した熱を効率良くスラグ浴（５）全体へ伝え
させ、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を得る
ことを目的とする。This invention was made to solve these problems, and it allows the generated heat to be efficiently transmitted throughout the slag bath (5), increases the reaction interface area between the Cr ore and the carbonaceous material,
It is an object of the present invention to provide a method for producing a high chromium alloy that can reduce the consumption of carbonaceous material and reduce the production 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、転炉型の炉
体に金属溶湯を保持させ、該炉体内に原料供給手段から
Ｃｒ鉱石、炭材及びフラックスを供給させ、該炉体内に
上吹きランスから酸化性ガスを吹き込ませるとともに、
該炉体内に二次燃焼用羽口から酸化性ガスを吹き込ませ
て、ＯＤ比≧０、４とさせ、該炉体の側壁部に設けた横
吹き羽口から該炉体内に形成されたスラグ浴へＣｒ鉱石
と炭材とをガスとともに吹き込ませてなるものである。The method for producing a high chromium alloy according to the present invention includes holding a molten metal in a converter-type furnace body, supplying Cr ore, carbonaceous material, and flux into the furnace body from a raw material supply means, and blowing top into the furnace body. Along with blowing oxidizing gas from the lance,
Oxidizing gas is blown into the furnace body from the secondary combustion tuyere to make the OD ratio ≧0, 4, and the slag formed inside the furnace body from the side blowing tuyere provided on the side wall of the furnace body. It is made by blowing Cr ore and carbonaceous material together with gas into a bath.
この発明においては、横吹き羽口からスラグ浴内へＣｒ
鉱石と炭材とをガスとともに吹き込ませると、このＣｒ
鉱石と炭材とガスとにより該スラグ浴が強力に攪拌され
、−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, Cr flows from the side blowing tuyere into the slag bath.
When ore and coal are blown together with gas, this Cr
The slag bath is strongly stirred by the ore, carbonaceous material, and gas, and a large amount of heat generated by secondary combustion is efficiently transferred to the slag bath, and the reaction contact area between the Cr ore and carbonaceous material is is increased, and as a result, Cr ore is efficiently reduced.
この発明は、従来技術において説明したものと略同−の
構成を有し、更に、横吹き羽口（７）からスラグ浴（５
）内にＣｒ鉱石と炭材とを酸素、空気又は窒素ガスとと
もに吹き込ませてなるものである。This invention has substantially the same configuration as that explained in the prior art, and furthermore, the side blowing tuyere (7) is connected to the slag bath (5).
) into which Cr ore and carbonaceous material are blown together with oxygen, air or nitrogen gas.
積吹き羽口（７）からスラグ浴（５）内にＣｒ鉱石と炭
材とを酸素、空気又は窒素ガスとともに吹き込ませると
、この吹き込ませたこれらのＣｒ鉱石と炭材とガスとに
よって炉体（１）内のスラグ浴（５）が強力に攪拌され
、−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）に均一に伝えられるとともに、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、
Ｃｒ鉱石が効率良く還元され、また、攪拌によりスラグ
浴の部分的な過熱が防止されて耐火物の溶損が抑制され
る。When Cr ore and carbonaceous materials are blown into the slag bath (5) through the blowing tuyeres (7) together with oxygen, air, or nitrogen gas, the furnace body is The slag bath (5) in (1) is strongly stirred, and a large amount of heat generated by secondary combustion is efficiently and uniformly transferred to the slag bath (5). The reaction contact area between Cr ore and carbonaceous material increases,
The Cr ore is efficiently reduced, and the stirring prevents the slag bath from being partially overheated, thereby suppressing melting loss of the refractory.
実験例
上吹きランス（４）から酸素を９００ＯＮｒｎ″／Ｈｒ
で吹き込ませ、二次燃焼用羽口（６）から酸素を５４０
ＯＮｒｎ’／）（ｒで吹き込ませてＯＤ比≧０．４とし
、ホッパー（３）から炉体（１）内にＣｒ鉱石を２９０
ｋｇ／ｍ ｉ ｎ、コークスを１３０ ｋｇ／ｓ＋ ｉ
ｎ供給し、横吹き羽口（７）からＣｒ鉱石を５０〜２
００ｋｇ／ｍ ｉ ｎ、炭材を４０＝１５０ｋｇ／ ｍ
ｉ ｎ １ガスとともに吹き込ませ、底吹き羽口（８
）から２０００ Ｎｍ／Ｈｒの酸素を吹き込ませて溶融
還元の実験をした。Experimental example Oxygen was supplied from the upper blowing lance (4) at 900ONrn''/Hr.
540 ml of oxygen from the secondary combustion tuyeres (6).
ONrn'/) (by blowing at r to make the OD ratio ≧0.4, 290 Cr ore is injected into the furnace body (1) from the hopper (3).
kg/min, coke at 130 kg/s+i
Cr ore is supplied from the side blowing tuyere (7) to 50 to 2
00kg/min, carbon material 40=150kg/m
Blow in with i in 1 gas, and blow through the bottom blowing tuyeres (8
), 2000 Nm/Hr of oxygen was blown into the melting reduction experiment.
この実験から、横吹き羽口（７）からのＣｒ鉱石と炭材
の吹込ｉとスラグ浴中のＣｒ濃度の減少速度との関係を
求めたところ、第２図Ａに示すとおりとなり、横吹き羽
口（７）からのＣｒ鉱石と炭材の吹込量と耐火物溶損指
数との関係を求めたところ、第３図Ａに示すとおりとな
った。From this experiment, the relationship between the injection i of Cr ore and carbonaceous material from the side-blown tuyere (7) and the rate of decrease in the Cr concentration in the slag bath was found as shown in Figure 2A. The relationship between the amount of Cr ore and carbon material injected from the tuyere (7) and the refractory corrosion index was determined, and the results were as shown in Figure 3A.
比較例
また、横吹き羽口（７）からガスだけを吹き込ませ、こ
れ以外は上記実験例と同様の実験をし、横吹き羽口（７
）からのガスの吹込量とスラグ浴中のＣｒｌｌｌ度の減
少速度との関係を求めたところ、第２図Ｂに示すとおり
となり、横吹き羽口（７）からのガスの吹込量と耐火物
溶損指数との関係を求めたところ、第３図已に示すとお
りとなった。Comparative Example In addition, an experiment was conducted in the same manner as in the above experimental example except that only gas was blown from the side blowing tuyere (7).
) The relationship between the amount of gas blown from the side blowing tuyeres (7) and the rate of decrease in the degree of Crll in the slag bath was determined as shown in Figure 2B. When the relationship with the erosion index was determined, it was as shown in Figure 3.
これらの実験により、横吹き羽口（７）によるＣｒ鉱石
と炭材の吹き込みがスラグ浴（５）への着熱効率を良好
ならしめ、スラグ浴（５）中のＣｒｊ１度の減少速度を
早めるとともに、耐火物の溶損量を少なくさせているこ
とがわかる。Through these experiments, it was found that the blowing of Cr ore and carbonaceous materials through the side blowing tuyere (7) improves the heat transfer efficiency to the slag bath (5), accelerates the rate of decrease of 1 degree Crj in the slag bath (5), and It can be seen that the amount of erosion of refractories is reduced.
この発明は以上説明したとおり、炉体内で発生した熱を
スラグ浴全体へ均一に効率良く伝えさせろとともに、Ｃ
ｒ鉱石と炭材との接触を良好ならしめたので、Ｃｒ鉱石
の還元効率が良好になり、Ｃｒ鉱石還元のための炭材の
消費量が減少し、その結果、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 aims to uniformly and efficiently transmit the heat generated in the furnace to the entire slag bath, and to
Since the contact between r ore and carbonaceous material is made good, the reduction efficiency of Cr ore is improved, and the consumption of carbonaceous material for Cr ore reduction is reduced, and as a result, high chromium alloy can be manufactured at low cost. The effect is that it can be done.
第１図は高クロム合金の製造方法を説明するための説Ｆ
ＩＡ図、第２図はガス吹込量とスラグ浴中のＣｒｌｌｌ
度の減少速度との関係を示すグラフ、第３図はガス吹込
量と耐火物の溶損指数との関係を示すグラフである。
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。Figure 1 is a theory F for explaining the manufacturing method of high chromium alloy.
IA diagram and Figure 2 show the amount of gas blown and the Crlll in the slag bath.
FIG. 3 is a graph showing the relationship between the amount of gas blown and the erosion index of the refractory. 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 (1)
給手段からＣｒ鉱石、炭材及びフラックスを供給し、該
炉体内に上吹きランスから酸化性ガスを吹き込ませると
ともに、該炉体内に二次燃焼用羽口から酸化性ガスを吹
き込ませてＯＤ比≧０．４とさせ、該炉体の側壁部に設
けた横吹き羽口から該炉体内に形成されたスラグ浴へＣ
ｒ鉱石と炭材とをガスとともに吹き込ませる高クロム合
金の製造方法Molten metal is held in a converter-type furnace body, Cr ore, carbonaceous material, and flux are supplied from a raw material supply means into the furnace body, and oxidizing gas is blown into the furnace body from a top blowing lance. Oxidizing gas is blown into the body from the secondary combustion tuyere to make the OD ratio ≧0.4, and C is fed into the slag bath formed inside the furnace body from the side blowing tuyere provided on the side wall of the furnace body.
Method for manufacturing high chromium alloy by blowing r ore and carbonaceous material together with gas
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489386A JPS62274019A (en) | 1986-05-21 | 1986-05-21 | Production of high-chrominum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11489386A JPS62274019A (en) | 1986-05-21 | 1986-05-21 | Production of high-chrominum alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62274019A true JPS62274019A (en) | 1987-11-28 |
Family
ID=14649284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11489386A Pending JPS62274019A (en) | 1986-05-21 | 1986-05-21 | Production of high-chrominum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62274019A (en) |
-
1986
- 1986-05-21 JP JP11489386A patent/JPS62274019A/en active Pending
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