JPS62207813A - Exhaust gas treatment device for ar-o2 refining furnace - Google Patents
Exhaust gas treatment device for ar-o2 refining furnaceInfo
- Publication number
- JPS62207813A JPS62207813A JP5202986A JP5202986A JPS62207813A JP S62207813 A JPS62207813 A JP S62207813A JP 5202986 A JP5202986 A JP 5202986A JP 5202986 A JP5202986 A JP 5202986A JP S62207813 A JPS62207813 A JP S62207813A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- damper
- gaseous
- recovery system
- way valve
- 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
- 238000007670 refining Methods 0.000 title claims abstract description 17
- 238000011084 recovery Methods 0.000 claims description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 130
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 20
- 229910052786 argon Inorganic materials 0.000 description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、Ａｒ−０，精錬炉から発生するＡｒ及びＣＯ
ガスの回収装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to the use of Ar-0, Ar and CO generated from smelting furnaces.
This invention relates to a gas recovery device.
［従来の技術］
Ａｒ−０２精錬炉は、多量のＡｒガスが使用される。こ
のＡｒガスは、高価なガスであるため、これを回収し、
再使用される。[Prior Art] The Ar-02 refining furnace uses a large amount of Ar gas. This Ar gas is an expensive gas, so it is collected and
Reused.
従来のＡｒ回収方法は、精錬炉から発生するＣＯガスと
Ａｒガスの混合ガス中のＣＯガスを燃焼して、ＡｒとＣ
Ｏ２ガスの混合ガスとし、この混合ガスを精錬炉に導い
て、Ａｒガスを再使用すると共にＣＯ２ガスは精錬に際
して脱炭（ＣＯ２＋ Ｃ＝ ２ ＣＯ）に寄与せしめる
ものがある（特公昭５７−２０３７２号１特公昭５５−
３４８４７号）。The conventional Ar recovery method burns CO gas in a mixed gas of CO gas and Ar gas generated from a refining furnace to recover Ar and C.
A mixed gas of O2 gas is introduced into a refining furnace, where Ar gas is reused and CO2 gas contributes to decarburization (CO2+ C= 2 CO) during refining (Japanese Patent Publication No. 57-20372). No. 1 Special Public Service 1984-
No. 34847).
又、別の＾「回収方法としては、精錬炉から発生するＣ
ＯガスとＡｒの混合ガス中のＣＯガスを燃焼して、Ａｒ
とＣＯ２ガスの混合ガスにし、この混合ガスを冷却し、
Ｃ０２ガスを吸収材にて吸収分離して、Ａｒガスを回収
する方法がある（特公昭５２’−２８７５０号、特公昭
５０−１１９９９号）。In addition, there is another method for recovering C generated from smelting furnaces.
By burning CO gas in a mixture of O gas and Ar, Ar
and CO2 gas, and cool this mixed gas,
There is a method of recovering Ar gas by absorbing and separating C02 gas using an absorbent material (Japanese Patent Publication No. 52'-28750, Japanese Patent Publication No. 11999-1987).
［発明が解決しようとする問題点］
上記従来のＡｒ回収方法は、いづれも精錬炉から発生す
るＣＯガスをすべて燃焼させるものであった。[Problems to be Solved by the Invention] All of the conventional Ar recovery methods described above burn all of the CO gas generated from the refining furnace.
そのため、燃料として或いは化学産業等に使用できるＣ
Ｏガスは、無駄に捨てられてしまい、省資源の観点から
好ましくなく、又精錬炉から発生する大量のＣＯガスを
燃焼させることにより、ガスの容積が大きくなって、Ａ
ｒを回収するための各ｍ器も大型化するという欠点があ
った。Therefore, C can be used as fuel or in the chemical industry, etc.
O gas is wasted and is undesirable from the viewpoint of resource conservation.Also, by burning a large amount of CO gas generated from the smelting furnace, the volume of gas becomes large and A
There was a drawback that each m device for collecting r was also large in size.
［発明の目的］
本発明は、上記問題乃至は欠点を解決するためになされ
たものであり、ＣＯガスの回収とＡｒの回収を効率よく
行うようにしたＡｒ−０２精錬炉の排ガス処理装置を提
供することを目的とするものである。[Object of the Invention] The present invention has been made to solve the above-mentioned problems or drawbacks, and provides an exhaust gas treatment device for an Ar-02 refining furnace that efficiently recovers CO gas and Ar. The purpose is to provide
［問題点を解決するための手段］
上記問題点を解決するために本発明は、計−〇、精錬時
に発生するＣＯガス、＾「ガスの濃度に合せて回収する
ようにしたものである。即ち、本発明の排ガス処理装置
は、Ａｒ−０２精峠炉から発生するＣＯガスを回収する
ための水封弁を備えたＣＯガス回収系と、ＣＯ２ガスを
排出するための放散系と、Ａｒガスを回収するためのＡ
ｒガス回収系との三つの系を主導路より分岐して設ける
。そして、この分岐した三つの系をそれぞれ交互に切換
えるＣＯガス回収系及びＡｒ回収系三方弁を設けたもの
である。[Means for Solving the Problems] In order to solve the above problems, the present invention is designed to recover CO gas generated during refining in accordance with the concentration of the CO gas. That is, the exhaust gas treatment apparatus of the present invention includes a CO gas recovery system equipped with a water seal valve for recovering CO gas generated from the Ar-02 Seitouge furnace, a diffusion system for discharging CO2 gas, and an Ar A for recovering gas
Three systems including the r-gas recovery system are provided branching off from the main path. A three-way valve for a CO gas recovery system and an Ar recovery system is provided to alternately switch between these three branched systems.
［作 用］
本発明の排ガス処理装置は、以上のように構成されてい
るので、ＣＯガスの濃度の高い排ガスは、ＣＯガス回収
系により回収し、又Ａｒガスの濃度の高い排ガスは、Ａ
ｒガス回収系により回収する。この＾「ガス回収に際し
ては、混合している少量のＣＯガスは燃焼してＣＯ２ガ
スとし、前述した従来技術により＾「ガスのみを分離回
収する。この場合ＣＯガスは少量であるので、大型の機
器は必要としない。そして、上記ＣＯガス回収系及び＾
「ガス回収系は、三方弁により切換えられる。[Function] Since the exhaust gas treatment device of the present invention is configured as described above, exhaust gas with a high concentration of CO gas is recovered by the CO gas recovery system, and exhaust gas with a high concentration of Ar gas is recovered by the A gas recovery system.
rRecovered by gas recovery system. When recovering this gas, a small amount of mixed CO gas is burned to become CO2 gas, and using the conventional technology mentioned above, only the gas is separated and recovered. In this case, since the amount of CO gas is small, a large No equipment is required.The above CO gas recovery system and ^
“The gas recovery system is switched by a three-way valve.
［実施例］
先ず、第２図及び第３図によりＡｒ −０，精錬の経時
的な徘ガス組成について説明する。[Example] First, the composition of wandering gas over time during Ar-0 and refining will be explained with reference to FIGS. 2 and 3.
第２図は、２５０ Ｔｏｎ炉の実例で、吹錬開始より２
５分乃至は３５分までの精錬は、ｏｚｆｆｉが多く、こ
の間の精錬炉から出る排ガスは、ｃＯガス濃度が高い、
又、吹！１ｌｉ３５分から５５分までは、Ａｒガスのみ
が使用されて精錬が行われ、５５分から９５分の間では
、Ａｒガスと少量の０２が使用されて精錬される。従っ
て、吹錬開始後３５分から９５分の間では、＾「ガス濃
度の高い排ガスが発生する。Figure 2 shows an example of a 250 ton furnace.
Refining for 5 minutes to 35 minutes has a large amount of ozffi, and the exhaust gas emitted from the refining furnace during this period has a high cO gas concentration.
Again, blow! From 1li35 minutes to 55 minutes, only Ar gas is used for refining, and from 55 minutes to 95 minutes, Ar gas and a small amount of 02 are used for refining. Therefore, from 35 minutes to 95 minutes after the start of blowing, exhaust gas with high gas concentration is generated.
この実例からみて、吹錬開始から３５分までは、ＣＯガ
スの回収を行い、３５分以後９５分までは、Ａｒガスの
回収を行う。From this example, CO gas is recovered for 35 minutes from the start of blowing, and Ar gas is recovered for 95 minutes after 35 minutes.
第３図は、１２０Ｔｏｎ炉の実例で、吹錬開始から１１
分まではＣＯガス濃度が高い排ガスが発生し、１１分以
後５５分までは、＾「ガス濃度の高い排ガスが発生する
。Figure 3 shows an example of a 120 ton furnace.
From 11 minutes to 55 minutes, exhaust gas with a high CO gas concentration is generated.
従って、この炉の場合は、吹錬開始後１１分までは、Ｃ
Ｏガス回収を行い、１１分以後５５分までは、Ａｒガス
の回収を行う。Therefore, in the case of this furnace, C
O gas is recovered, and Ar gas is recovered from 11 minutes to 55 minutes.
上記＾「ガス回収に際して、少量のＯ３により生成され
るＣＯガスは、燃焼してＣＯ２ガスとなし、従来技術に
よりＣＯ，ガスは分離して純度の高いＡｒガスを回収す
る。``During gas recovery, CO gas generated by a small amount of O3 is burned to become CO2 gas, and using conventional technology, CO and gas are separated to recover highly pure Ar gas.
又上記回収に際しては、時間を一つの基準として行うこ
ともできるが、ＣＯガス又は計ガス濃度を検知して行う
こともできる。In addition, the above-mentioned collection can be performed using time as a reference, but it can also be performed by detecting the CO gas or metered gas concentration.
次に第１図により、本発明の排ガス処理装置の一実施例
を説明する０図において、１は転炉（精錬炉）である、
転炉１内にある溶銑中には、酸素吹込みランス２より純
酸素が吹込まれると共に、下方より＾「ガス１８が吹込
まれて精錬される。このとぎ溶銑中のＣと０．とが反応
して大量のＣＯガスが発生する。従って、転炉１からは
ＣＯガスとＡｒガスの混合ガスが排出される。この排出
された排ガスは誘引送風機により冷却器３に誘引され冷
却される。４及び５は集塵器である。８はＣＯガス回収
ホルダである。Next, referring to FIG. 1, in FIG.
Pure oxygen is blown into the hot metal in the converter 1 from the oxygen injection lance 2, and gas 18 is blown in from below for refining. A large amount of CO gas is generated by the reaction. Therefore, a mixed gas of CO gas and Ar gas is discharged from the converter 1. This discharged exhaust gas is drawn into the cooler 3 by an induced blower and is cooled. 4 and 5 are dust collectors. 8 is a CO gas recovery holder.
フは水封弁、１９は水封式逆止弁であり、それぞれ主導
路２０より分岐されたダクトの途中に設けられ、ＣＯガ
ス回収系を構成している。19 is a water seal valve, and 19 is a water seal type check valve, each of which is provided in the middle of a duct branched from the main channel 20, and constitutes a CO gas recovery system.
１２はＣＯガス回収系の入口に設けられたダンパである
。９は主導路２０より分岐したダクト２１に接続された
煙突であり、ＣＯ２ガスを放散するための放散系を構成
している。１４は放散系の入口に設けられたダンパであ
る。１０はアルゴンガス回収ホルダであり、主導路２０
より分岐されたダクト２２に接続されてアルゴンガス回
収系を構成している。１５はアルゴンガス回収系の人口
に設けられたダンパである。12 is a damper provided at the inlet of the CO gas recovery system. A chimney 9 is connected to a duct 21 branched from the main channel 20, and constitutes a dissipation system for dissipating CO2 gas. 14 is a damper provided at the entrance of the radiation system. 10 is an argon gas recovery holder, and a main path 20
The argon gas recovery system is connected to a duct 22 which is further branched. 15 is a damper installed in the argon gas recovery system.
１６は押込み送風機であり、アルゴンガスホルダ１０内
のＡｒガスを転炉１の炉口部に供給し、炉口とフード２
３との間をシールする。１１は炉口とフード２３間を密
封するためのスカートである。１７はＡｒガスを炉口に
導くための導管である。又、前記ダンパ１２とダンパ１
３は、一体となって動作し、ダンパ１３が開のときダン
パ１２は閑の状！（図の状態）となり、その逆にダンパ
１３が閉のときはダンパ１２は開の状態となる。このよ
うにダンパ１２，１３によりＣＯガス回収系三方弁が形
成される。又、ダンパ１４と１５は一体となって動作し
、ダンパ１４が閉のときダンパ１５は開となり、その逆
にダンパ１４が開のときダンパ１５は閉となって、Ａｒ
回収系三方弁が形成される。16 is a forced air blower, which supplies Ar gas in the argon gas holder 10 to the furnace mouth of the converter 1, and connects the furnace mouth and the hood 2.
Seal between 3 and 3. 11 is a skirt for sealing between the furnace mouth and the hood 23. 17 is a conduit for guiding Ar gas to the furnace mouth. Moreover, the damper 12 and the damper 1
3 operates in unison, and when the damper 13 is open, the damper 12 is idle! (the state shown in the figure), and conversely, when the damper 13 is closed, the damper 12 is in the open state. In this way, the dampers 12 and 13 form a three-way valve for the CO gas recovery system. Further, the dampers 14 and 15 operate in unison, and when the damper 14 is closed, the damper 15 is open, and conversely, when the damper 14 is open, the damper 15 is closed, and the Ar
A recovery system three-way valve is formed.
以上のように構成した本実施例の作用について説明する
。吹錬の初期におけるタンポンガス（爆発防止用の００
２ガス）は、煙突９より放出される。即ち、ＣＯガス回
収系三方弁（ダンパ１２，１３）のダンパ１２を閑とな
し、ダンパ１３を開となす、と同時にＡｒガス回収系三
方弁（ダンパ１４．＋５）のダンパ１４を開となし、ダ
ンパ１５を閉となして、放散系を開放し、Ｃ０２ガスを
煙突９より放散する。The operation of this embodiment configured as above will be explained. Tampon gas at the beginning of blowing (00 to prevent explosion)
2 gas) is released from the chimney 9. That is, the damper 12 of the CO gas recovery system three-way valve (dampers 12, 13) is left idle and the damper 13 is opened, and at the same time, the damper 14 of the Ar gas recovery system three-way valve (dampers 14.+5) is opened. , the damper 15 is closed, the dissipation system is opened, and the CO2 gas is dissipated from the chimney 9.
次にＣＯガス濃度の高い時期（時間的又は、ＣＯガス濃
度検出により検知する）は、ＣＯガス回収系三方弁（ダ
ンパ１２，１３）のみを操作し、ダンパ１２を開となし
、ダンパ１３を閉となして、ＣＯガスをガスホルダ８に
回収する。次にＡｒガス濃度が高い時期（時間的又はＡ
ｒガス濃度検出により検知する）は、ＣＯ回収系三方弁
のダンパ１２を閉となし、ダンパ１３を開となす、と同
時にＡｒ回回数系三方弁ダンパ１４を閉となし、ダンパ
１５を開となす、或いはＣＯガスを回収している間に、
又はＣＯ，ガスを煙突９より放散後に、予め＾「回数系
三方弁のダンパ１４を閉、ダンパ１５を開の状態にして
おいて、Ａｒガス回収時にＣＯガス回収系三方弁の操作
のみで、＾「回収系を開放することができる。Next, when the CO gas concentration is high (detected over time or by CO gas concentration detection), only the CO gas recovery system three-way valve (dampers 12, 13) is operated, damper 12 is opened, and damper 13 is closed. It is closed and CO gas is collected into the gas holder 8. Next, the period when the Ar gas concentration is high (temporal or
(detected by R gas concentration detection) closes the damper 12 of the CO recovery system three-way valve and opens the damper 13, and at the same time closes the Ar cycle system three-way valve damper 14 and opens the damper 15. While collecting eggplant or CO gas,
Alternatively, after dissipating CO and gas from the chimney 9, close the damper 14 of the three-way valve and open the damper 15 in advance, and when recovering Ar gas, simply operate the three-way valve of the CO gas recovery system. ^ “We can open up the recovery system.
このようにして、アルゴンガス回収タンク１０に回収さ
れた＾「ガスは、アルゴンガス精製袋！（図示省略）へ
導かれる。アルゴンガス精製装置では、少量含まれてい
るＣＯガスを燃焼してＣＯ２ガスとなし、吸収装置等に
よりＣ０２ガスを吸収分離し、純度の高い＾「ガスを回
収する。この場合、含有されているＣ０２ガスは少量で
あるので、アルゴンガス精製装置は小型化で診る。In this way, the gas collected in the argon gas recovery tank 10 is led to an argon gas purification bag (not shown).In the argon gas purification device, the CO gas contained in a small amount is combusted to produce CO2. The CO2 gas is absorbed and separated using an absorption device, etc., and the highly pure gas is recovered.In this case, since the amount of CO2 gas contained is small, the argon gas purification device should be miniaturized.
［発明の効果］
以上詳述した通り本発明による＾「−０２精錬炉の排ガ
ス処理装置によれば、ＣＯガス回収系とＣＯｘガス放散
系及び＾「ガス回収系の三つの系統を設け、これら三つ
の系をそれぞれＣＯガス回収系三方弁と、Ａｒ回収系三
方弁にて切換えるようにしたので、ＣＯガスの回収とＡ
ｒガスの回収が可能となり、又、このようにＣＯガスと
Ａｒガスを分けて回収したので、回収される＾「ガス中
に含まれるＣＯガスは少量となり、＾「精製装置を小型
化することができるなど優れた効果を奥する。[Effects of the Invention] As detailed above, according to the present invention, the -02 refining furnace exhaust gas treatment system is provided with three systems: a CO gas recovery system, a COx gas diffusion system, and a gas recovery system. Since the three systems are switched by a three-way valve for the CO gas recovery system and a three-way valve for the Ar recovery system, CO gas recovery and A
It is now possible to recover r gas, and since the CO gas and Ar gas are collected separately in this way, the amount of CO gas contained in the gas is small, which makes it possible to downsize the purification equipment. It has great effects such as being able to do things.
第１図は本発明の一実施例を示すＡｒ−（ｈ＄ｌｔ錬炉
の排ガス処理装置の構成図である。第２図は２、５０７
ｏｎ炉、第３図は、１２０ Ｔｏｎ炉の実例に基いて、
夫々排ガスの組成を経時的に示した図である。
１・・・転炉 ７・・・水封弁 ８・・・ＣＯガス
ホルダ ９・・・煙突 １０・・・アルゴンガスホ
ルダ １２，１３，１４．１５・・・ダンパ１９・・
・水封式逆止弁
水封弁７．水封式逆止弁１９．ＣＯガスホルダ８・・・
ＣＯガス回収系
ダクト２１．煙突９・・・放散系
ダクト２２．アルゴンガスホルダ１０・・・Ａｒガス回
収系
ダンパ１２．ダンパ１３・・・ＣＯガス回収系三方弁FIG. 1 is a block diagram of an exhaust gas treatment device for an Ar-(h$lt furnace) showing one embodiment of the present invention.
Figure 3 is based on an example of a 120 Ton furnace.
It is a figure showing the composition of each exhaust gas over time. 1... Converter 7... Water seal valve 8... CO gas holder 9... Chimney 10... Argon gas holder 12, 13, 14. 15... Damper 19...
・Water seal check valve Water seal valve 7. Water seal check valve 19. CO gas holder 8...
CO gas recovery system duct 21. Chimney 9...Dissipation system duct 22. Argon gas holder 10...Ar gas recovery system damper 12. Damper 13...CO gas recovery system three-way valve
Claims (1)
めの水封逆止弁を備えたＣＯガス回収系と、ＣＯ＿２ガ
スを排出するための放散系と、Ａｒガスを回収するため
のＡｒガス回収系とを主導路より分岐し、この分岐した
ＣＯガス回収系と放散系とＡｒガス回収系とを、それぞ
れ交互に切換えるＣＯガス回収系及びＡｒ回収系三方弁
を備えたＡｒ−Ｏ＿２精錬炉の排ガス処理装置。A CO gas recovery system equipped with a water seal check valve to recover CO gas generated from the Ar-O_2 refining furnace, a dissipation system to discharge CO_2 gas, and an Ar gas recovery system to recover Ar gas. This is an Ar-O_2 smelting furnace equipped with a CO gas recovery system and an Ar recovery system three-way valve that branches the CO gas recovery system from the main path and alternately switches between the branched CO gas recovery system, the dissipation system, and the Ar gas recovery system. Exhaust gas treatment equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5202986A JPS62207813A (en) | 1986-03-10 | 1986-03-10 | Exhaust gas treatment device for ar-o2 refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5202986A JPS62207813A (en) | 1986-03-10 | 1986-03-10 | Exhaust gas treatment device for ar-o2 refining furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62207813A true JPS62207813A (en) | 1987-09-12 |
Family
ID=12903385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5202986A Pending JPS62207813A (en) | 1986-03-10 | 1986-03-10 | Exhaust gas treatment device for ar-o2 refining furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62207813A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59152210A (en) * | 1983-02-18 | 1984-08-30 | Hitachi Ltd | Recovery method of argon |
| JPS602617A (en) * | 1983-06-21 | 1985-01-08 | Kawasaki Heavy Ind Ltd | Method for fractionating, recovering and reutilizing converter gas |
-
1986
- 1986-03-10 JP JP5202986A patent/JPS62207813A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59152210A (en) * | 1983-02-18 | 1984-08-30 | Hitachi Ltd | Recovery method of argon |
| JPS602617A (en) * | 1983-06-21 | 1985-01-08 | Kawasaki Heavy Ind Ltd | Method for fractionating, recovering and reutilizing converter gas |
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