JPH04154907A - Degassing method from molten metal - Google Patents
Degassing method from molten metalInfo
- Publication number
- JPH04154907A JPH04154907A JP27500590A JP27500590A JPH04154907A JP H04154907 A JPH04154907 A JP H04154907A JP 27500590 A JP27500590 A JP 27500590A JP 27500590 A JP27500590 A JP 27500590A JP H04154907 A JPH04154907 A JP H04154907A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- molten steel
- porous material
- pipe
- molten
- 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
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 238000007872 degassing Methods 0.000 title claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 51
- 239000010959 steel Substances 0.000 abstract description 51
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 9
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 15
- 238000005261 decarburization Methods 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000007800 oxidant agent Substances 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000007750 plasma spraying Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は溶融金属からの脱ガス方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for degassing molten metal.
溶融金属中の炭素は一般に下記のような反応で除去され
る。Carbon in molten metal is generally removed by the following reaction.
旦＋−Ｑ−→ Ｃｏ （１）
ここで、旦、旦は溶融金属中に溶解した炭素および酸素
であり、ＣＯは発生した一酸化炭素ガスを示す。Tan+-Q-→Co (1) Here, Tan and Tan are carbon and oxygen dissolved in the molten metal, and CO indicates generated carbon monoxide gas.
従来、溶融金属中の炭素を除去する方法としては、溶融
金属を減圧下に曝し一酸化炭素ガスの分圧を小さくし、
（１）式の反応を右に反応させることにより溶融金属中
の炭素を除去する方法が一般的に行われている。Conventionally, the method for removing carbon from molten metal is to expose the molten metal to reduced pressure to reduce the partial pressure of carbon monoxide gas.
A method of removing carbon from molten metal by carrying out the reaction of formula (1) as shown in the right is generally practiced.
この場合、溶融金属内部からガスが発生ずるため、脱ガ
ス速度を速くする程、溶融金属は飛散し、減圧容器及び
減圧ポンプを汚染する。従って、減圧容器内及び減圧ポ
ンプの清掃をする必要があり、生産性を低下させる等の
問題があった。In this case, gas is generated from inside the molten metal, so the faster the degassing rate is, the more the molten metal scatters and contaminates the vacuum container and vacuum pump. Therefore, it is necessary to clean the inside of the vacuum container and the vacuum pump, which causes problems such as reduced productivity.
又、減圧下に溶融金属を曝すことにより、溶融金属その
ものが蒸発し、溶融金属の歩留を低下させる等の問題も
あった。Furthermore, by exposing the molten metal to reduced pressure, the molten metal itself evaporates, resulting in a reduction in the yield of the molten metal.
更に、ガスを除去しようとする溶融金属は専用の減圧容
器に移し替える必要があり、作業性を悪くする等の問題
もあった。Furthermore, it is necessary to transfer the molten metal from which the gas is to be removed to a dedicated vacuum container, which poses problems such as poor workability.
本発明は、これらの問題を解決し、安価で且つ効率的に
溶融金属から炭素を除去するために開発されたものであ
る。The present invention was developed to solve these problems and to remove carbon from molten metal inexpensively and efficiently.
本発明の要旨とするところは、溶融金属は通過させない
が、一酸化炭素ガスを通過させる多孔質物質の表面に酸
化物質の層を形成し、その酸化物質層の表面を溶融金属
に接触させ、多孔質物質の他方の面を減圧下に曝すこと
により溶融金属が含有する炭素を除去することを特徴と
する溶融金属からの脱ガス方法にある。The gist of the present invention is to form an oxide layer on the surface of a porous material that does not allow molten metal to pass through but allows carbon monoxide gas to pass through, and to bring the surface of the oxide layer into contact with the molten metal. A method for degassing a molten metal, characterized in that carbon contained in the molten metal is removed by exposing the other side of the porous material to a reduced pressure.
従来法による脱ガス方法は、溶融金属の自由表面を直接
減圧下に曝すため、溶融金属内部で生成したガスが溶融
金属の自由表面で破裂し、溶融金属の飛散を発生させ、
減圧容器及び減圧ポンプを汚染することとなる。又、溶
融金属自由表面を直、接減圧下に曝すため、蒸気圧の低
い溶融金属の場合は溶融金属そのものが蒸発することも
ある。つまり、従来法はガスを除去しようとする溶融金
属を直接減圧下に曝すために種々の問題が発生し、脱ガ
ス処理の生産性の低下、溶融金属の歩留の低下を招いて
いる。In the conventional degassing method, the free surface of the molten metal is directly exposed to reduced pressure, so the gas generated inside the molten metal ruptures on the free surface of the molten metal, causing the molten metal to scatter.
This will contaminate the vacuum vessel and vacuum pump. Furthermore, since the free surface of the molten metal is directly exposed to reduced pressure, if the molten metal has a low vapor pressure, the molten metal itself may evaporate. In other words, in the conventional method, various problems occur because the molten metal from which gas is to be removed is directly exposed to reduced pressure, leading to a decrease in the productivity of the degassing process and a decrease in the yield of the molten metal.
そこで、本発明者らは溶融金属内部で生成したガスを減
圧下に直接放出しない方法について種々の検討を行い、
その結果、溶融金属は通過させないが、一酸化炭素ガス
を通過させる多孔質物質を介して、溶融金属内部で生成
したガスを減圧下に放出すれば、従来法の溶融金属の飛
散及び溶融金属の蒸発を防止しつつ、溶融金属から炭素
を除去できることを見出したものである。Therefore, the present inventors conducted various studies on methods that do not directly release the gas generated inside the molten metal under reduced pressure.
As a result, if the gas generated inside the molten metal is released under reduced pressure through a porous material that does not allow the molten metal to pass through, but allows carbon monoxide gas to pass through, the molten metal can be prevented from scattering in the conventional method. It has been discovered that carbon can be removed from molten metal while preventing evaporation.
以下、溶鋼の脱炭を例に詳細に説明する。Hereinafter, decarburization of molten steel will be explained in detail as an example.
従来法で溶鋼の脱炭を行う場合は、溶鋼の入った容器ご
とタンクの中に置き、真空ポンプでタンク内を減圧にし
脱炭する真空溶解炉方式の脱ガス方法、あるいは溶鋼を
減圧槽内に送り込むＲＨ脱ガス装置、ＤＨ脱ガス装置等
により脱炭する脱ガス方法が採用されていた。この場合
、タンク内あるいは槽内の真空度をあげると、一酸化炭
素ガス分圧は低下し、溶鋼中に溶解する平衡炭素および
酸素は減少するので、溶鋼中から一酸化炭素ガス気泡が
発生する。この一酸化炭素ガスは溶鋼静圧が小さくなる
溶鋼自由表面に近づくにしたがい、急激に気泡径が増大
し、溶鋼自由表面から離脱するが、離脱の際、溶鋼を飛
散することになる。When decarburizing molten steel using the conventional method, a degassing method using a vacuum melting furnace method is used, in which the container containing the molten steel is placed in a tank and the tank is depressurized using a vacuum pump to decarburize, or the molten steel is degassed by placing the molten steel in a decompression tank. A degassing method was adopted in which decarburization was performed using an RH degassing device, a DH degassing device, etc. In this case, when the degree of vacuum inside the tank or bath is increased, the partial pressure of carbon monoxide gas decreases, and the equilibrium carbon and oxygen dissolved in the molten steel decreases, so carbon monoxide gas bubbles are generated from the molten steel. . As this carbon monoxide gas approaches the free surface of the molten steel where the static pressure of the molten steel decreases, its bubble diameter rapidly increases and it leaves the free surface of the molten steel, but when it leaves, it scatters the molten steel.
また、通常、工業的に使われる溶鋼はマンガンを含有し
ているが、マンガンの蒸気圧は１２９２℃で１ｍ＋Ｈｇ
である。タンク内あるいは槽内の真空度が１閣ｎｇ以上
の高真空度になると、マンガンは蒸発しく溶鋼成分を変
化させるばかりでなく、マンガン蒸気でタンク内、槽内
、あるいは真空ポンプを汚染する恐れがある。Additionally, molten steel used industrially usually contains manganese, and the vapor pressure of manganese is 1m+Hg at 1292℃.
It is. If the degree of vacuum inside the tank or tank reaches a high vacuum level of 1 ng or more, manganese will not only evaporate and change the molten steel composition, but also there is a risk that the manganese vapor will contaminate the tank, tank, or vacuum pump. be.
本発明は、溶融金属は通過させないが、一酸化炭素ガス
を通過させる多孔質物質の表面に酸化物質の層を形成し
、その酸化物質層の表面を溶融金属に接触させ、他方の
面を減圧下に曝すことにより溶融金属が含有する炭素を
除去する脱ガス方法である。In the present invention, a layer of oxidation material is formed on the surface of a porous material that does not allow molten metal to pass through, but allows carbon monoxide gas to pass through, the surface of the oxide material layer is brought into contact with the molten metal, and the other surface is depressurized. This is a degassing method in which carbon contained in molten metal is removed by exposing it to the atmosphere.
第１図に示すように、本発明者等は先に溶鋼からの脱炭
方法について提案した。その方法は、容器１に保持した
溶鋼２の中に、片端を封じた多孔質物質からなるパイプ
３を浸漬し、パイプ３の他端を真空ポンプ４に連結して
パイプ３内を減圧する。これによって、溶鋼２に接した
パイプ３の外側で発生した一酸化炭素ガス５は、パイプ
３の内側に吸引され、真空ポンプ４により排気される。As shown in FIG. 1, the present inventors previously proposed a method for decarburizing molten steel. In this method, a pipe 3 made of a porous material with one end sealed is immersed in molten steel 2 held in a container 1, and the other end of the pipe 3 is connected to a vacuum pump 4 to reduce the pressure inside the pipe 3. As a result, carbon monoxide gas 5 generated outside the pipe 3 in contact with the molten steel 2 is sucked into the inside of the pipe 3 and exhausted by the vacuum pump 4.
パイプ３を構成する多孔質物質としては、通常溶鋼処理
に使用されている耐火物で気孔率が１０〜３０％あれば
十分である。As the porous material constituting the pipe 3, a refractory material normally used for processing molten steel with a porosity of 10 to 30% is sufficient.
しかし、この脱炭反応後の多孔質物質製パイプ３を観察
すると溶鋼２と接した表面が浸食されているのが観察さ
れ、多孔質物質が劣化するために多数回使用出来ないこ
とが分かった。この原因を解明するため種々の検討を行
った結果、脱炭する際に、（１）式の旦が多孔質物質か
ら供給され、多孔質物質が分解するためであることが分
かった。However, when observing the porous material pipe 3 after this decarburization reaction, it was observed that the surface in contact with the molten steel 2 was eroded, and it was found that it could not be used many times because the porous material deteriorated. . As a result of various studies conducted to elucidate the cause of this problem, it was found that during decarburization, the fuel in formula (1) is supplied from the porous material and the porous material decomposes.
これを改善するため種々の実験を行った結果、第２図に
示したように、多孔質物質製パイプ３の表面に酸化物質
層６を形成し、その酸化物質層６の表面を溶鋼２に接触
させ、多孔質物質製パイプ３の他方の面を減圧下に曝す
ことにより、上記問題が解決できることを確かめた。As a result of conducting various experiments to improve this problem, as shown in FIG. It was confirmed that the above problem could be solved by bringing the other side of the porous pipe 3 into contact with each other and exposing it to reduced pressure.
即ち、多孔質物質製パイプ３の表面に形成した酸化物質
層６は溶鋼中の炭素と反応するに必要な酸素を供給する
ので、多孔質物質製パイプ３本体の侵食が防止でき、多
孔質物質製パイプ３本体の多数回使用が可能となる。That is, the oxide layer 6 formed on the surface of the porous material pipe 3 supplies the oxygen necessary to react with carbon in the molten steel, thereby preventing the body of the porous material pipe 3 from being eroded. The main body of the manufactured pipe 3 can be used many times.
酸化物質としては酸化鉄、酸化珪素、酸化マグネシウム
およびこれらの混合物あるいは化合物等が使用可能であ
る。As the oxidizing substance, iron oxide, silicon oxide, magnesium oxide, mixtures or compounds thereof, etc. can be used.
また、酸化物質層６の形成方法としては、通常の耐火物
補修と同様に、水とバインダーで混練した酸化物質を多
孔質物質の表面に塗布し、これを乾燥すると気孔率１０
〜３０％の酸化物質層６が形成できる。The method for forming the oxide layer 6 is to apply an oxide material mixed with water and a binder to the surface of the porous material, and then dry it to form a porosity of 10.
~30% oxide material layer 6 can be formed.
また、他の方法としては酸化物質を多孔質物質の表面に
、例えばプラズマ溶射することで酸化物質層を形成する
ことができる。溶射した酸化物質層の気孔率は酸化物質
の粒度、溶融度合いを調節することによって確保できる
。Alternatively, an oxide layer can be formed by, for example, plasma spraying an oxide material on the surface of a porous material. The porosity of the sprayed oxide layer can be ensured by adjusting the particle size and degree of melting of the oxide.
上記酸化物質層６の厚みは、−回の脱炭処理に対して、
２〜５ｍの厚みで十分である。The thickness of the oxide layer 6 is as follows for - times of decarburization treatment:
A thickness of 2 to 5 m is sufficient.
〔実施例１〕
第１表の実施例１に示した下端を閉じた多孔質物質製パ
イプの表面に、酸化物質として酸化鉄とシリカの重量比
が１対１の粉体に、バインダーを添加し水を混合してペ
ースト状となしたものを３肝の厚みに塗布し、加熱、乾
燥した後、１００ｋｇ溶解炉で第２表の実施例１に示し
た成分に調整した溶鋼に２０印浸漬し、多孔質物質製パ
イプ内を真空ポンプで１ｍｍＦ１ｇまで減圧し、３０分
間脱炭処理をした。尚、溶鋼表面は１気圧のアルゴンで
シールした。初期炭素０．０３％の溶鋼が処理後０．０
０３％まで脱炭された。尚、多孔質物質製パイプに塗布
した酸化物質は２ＩＩＩＩ１１程度溶損したが、多孔質
物質製パイプ本体の侵食は認められなかった。また、溶
鋼表面からの溶鋼飛散も認められなかった。[Example 1] A binder was added to the powder of iron oxide and silica in a weight ratio of 1:1 as an oxidizing substance on the surface of the porous material pipe with the lower end closed as shown in Example 1 in Table 1. A paste made by mixing with water was applied to a thickness of 3 mm, heated and dried, and then immersed in molten steel adjusted to the composition shown in Example 1 of Table 2 in a 100 kg melting furnace for 20 marks. Then, the pressure inside the porous material pipe was reduced to 1 mmF1 g using a vacuum pump, and decarburization treatment was performed for 30 minutes. The surface of the molten steel was sealed with argon at 1 atm. Molten steel with initial carbon of 0.03% becomes 0.0 after treatment
It was decarburized to 0.3%. The oxidizing substance applied to the porous material pipe was eroded by about 2III11, but no erosion of the porous material pipe body was observed. In addition, no molten steel was observed to scatter from the molten steel surface.
〔実施例２〕
第１表の実施例２に示した下端を閉じた多孔質物質製パ
イプの表面に、酸化物質として酸化鉄とドロマイトの重
量比が１対１の粉体を３Ｍの厚みにプラズマ溶射した後
、１００ｋｇ溶解炉で第２表の実施例２に示した成分に
調整した溶鋼に２０印浸漬し、多孔質物質製パイプ内を
真空ポンプでｌｍｍＨｇまで減圧し、３０分間脱炭処理
をした。尚、溶鋼表面は１気圧のアルゴンでシールした
。初期炭素０．０３％の溶鋼が処理後０． ＯＯ４％ま
で脱炭された。尚、多孔質物質製パイプに塗布した酸化
物質は２ＩＩＩｆｆ１程度溶損したが、多孔質物質製パ
イプ本体の侵食は認められなかった。また、溶鋼表面か
らの溶鋼飛散も認められなかった。[Example 2] Powder with a weight ratio of iron oxide and dolomite of 1:1 as an oxidizing substance was applied to a thickness of 3M on the surface of the porous material pipe with its lower end closed as shown in Example 2 of Table 1. After plasma spraying, it was immersed in molten steel adjusted to the composition shown in Example 2 in Table 2 in a 100 kg melting furnace for 20 minutes, the pressure inside the porous material pipe was reduced to lmmHg with a vacuum pump, and decarburized for 30 minutes. Did. The surface of the molten steel was sealed with argon at 1 atm. Molten steel with an initial carbon content of 0.03% has a carbon content of 0.03% after treatment. It was decarburized to 4% OO. The oxidizing substance applied to the porous material pipe was eroded by about 2IIIff1, but no erosion of the porous material pipe body was observed. In addition, no molten steel was observed to scatter from the molten steel surface.
〔実施例３〕
第１表の実施例３に示した下端を閉じた多孔質物質製パ
イプの表面に、酸化物質として酸化鉄とシリカの重量比
が１対１の粉体を３ｍｍの厚みにプラズマ溶射した後、
１００ｋｇｆｆＩ解炉で第２表の実施例３の■に示した
成分に調整した溶鋼に２０ｃｍ浸漬し、多孔質物質製パ
イプ内を真空ポンプでｌｍｍＨｇまで減圧し、３０分間
脱炭処理をした。尚、溶鋼表面は１気圧のアルゴンでシ
ールした。初期炭素０．０３％の溶鋼が処理後０．００
３％まで脱炭された。この多孔質物質製パイプの表面に
、再度酸化物質として酸化鉄とシリカの重量比が１対１
の粉体を３胴の厚みにプラズマ溶射した後、１００ｋｇ
溶解炉で第２表の実施例３の■に示した成分に調整した
溶鋼に２０ｃｍ浸漬し、多孔質物質製パイプ内を真空ポ
ンプで１ｎｍ＋Ｈｇまで減圧し、３０分間脱炭処理をし
た。尚、溶鋼表面は１気圧のアルゴンでシールした。初
期炭素０．０３％の溶鋼が処理後０、００３％まで脱炭
された。酸化物質は２［ｌｌ１１程度溶損したが、多孔
質物質製パイプ本体の侵食は認められなかった。また、
溶鋼表面からの溶鋼飛散も認められなかった。[Example 3] Powder with a weight ratio of iron oxide to silica of 1:1 as an oxidizing substance was applied to a thickness of 3 mm on the surface of the porous material pipe shown in Example 3 in Table 1 with its lower end closed. After plasma spraying,
It was immersed for 20 cm in molten steel adjusted to the composition shown in Example 3 (2) in Table 2 in a 100 kgffI cracking furnace, the inside of the porous material pipe was reduced to 1 mmHg using a vacuum pump, and decarburized for 30 minutes. The surface of the molten steel was sealed with argon at 1 atm. Molten steel with an initial carbon content of 0.03% has a carbon content of 0.00% after treatment.
Decarburized to 3%. The surface of this porous material pipe is again coated with iron oxide and silica in a weight ratio of 1:1 as oxidizing substances.
After plasma spraying the powder to the thickness of 3 cylinders, 100 kg
It was immersed in a melting furnace for 20 cm in molten steel adjusted to have the composition shown in Example 3 () in Table 2, the inside of the porous material pipe was reduced to 1 nm+Hg using a vacuum pump, and decarburized for 30 minutes. The surface of the molten steel was sealed with argon at 1 atm. Molten steel with an initial carbon content of 0.03% was decarburized to 0.003% after treatment. The oxidized material was eroded to an extent of 2 [ll11], but no erosion of the porous pipe body was observed. Also,
No molten steel scattering from the molten steel surface was observed.
〔比較例１〕
１００ｋｇ溶解炉で第２表の比較例１に示した成分に調
整した溶鋼表面を真空ポンプで１ｓＨｇまで減圧し、３
０分間脱炭処理をした。初期炭素０．０３％の溶鋼が処
理後０．００４％まで脱炭され、脱炭効果は認められた
が、溶鋼が激しく飛散し、溶解炉上部に多量の地金が付
着した。[Comparative Example 1] The surface of the molten steel adjusted to the composition shown in Comparative Example 1 in Table 2 in a 100 kg melting furnace was depressurized to 1 sHg using a vacuum pump.
Decarburization treatment was performed for 0 minutes. The molten steel with an initial carbon content of 0.03% was decarburized to 0.004% after treatment, and the decarburization effect was observed, but the molten steel was violently scattered and a large amount of base metal adhered to the upper part of the melting furnace.
〔比較例２〕
１００ｋｇ溶解炉で第２表の比較例２に示した成Ｏ
分に調整した溶鋼表面を真空ポンプで１ｍｍＨ１まで減
圧し、３０分間脱炭処理をした。初期炭素０．０３％の
溶鋼が処理後０．０２５％までしか脱炭されず、脱炭効
率が非常に悪くなった。尚、脱炭されないため、溶鋼は
静かで、地金付着量は少なかった。[Comparative Example 2] The surface of the molten steel, which had been adjusted to the O content shown in Comparative Example 2 in Table 2 in a 100 kg melting furnace, was depressurized to 1 mmH1 with a vacuum pump and decarburized for 30 minutes. Molten steel with an initial carbon content of 0.03% was decarburized to only 0.025% after treatment, resulting in very poor decarburization efficiency. In addition, since it was not decarburized, the molten steel was quiet and the amount of base metal deposited was small.
〔比較例３〕
第１表の比較例３に示した下端を閉じた多孔質物質製パ
イプを、１００ｋｇ溶解炉で第２表の比較例３の■に示
した成分に調整した溶鋼に２０ｃｍ浸漬し、多孔質物質
製パイプ内を真空ポンプで１ｆｆＩＩＩｎｇまで減圧し
、３０分間脱炭処理をした。尚、溶鋼表面を１気圧のア
ルゴンでシールした。初期炭素０．０３％の溶鋼が処理
後０．００４％まで脱炭された。この多孔質物質製パイ
プを、１００ｋｇ溶解炉で第２表の比較例２の■に示し
た成分に調整した溶鋼に２０ｃｍ浸漬し、多孔質物質製
パイプ内を真空ポンプで１−１ｇまで減圧し、脱炭処理
をした。[Comparative Example 3] A pipe made of porous material with its lower end closed as shown in Comparative Example 3 in Table 1 was immersed for 20 cm in molten steel adjusted to the composition shown in Comparative Example 3 in Table 2 in a 100 kg melting furnace. Then, the pressure inside the porous material pipe was reduced to 1ffIIIng using a vacuum pump, and decarburization treatment was performed for 30 minutes. Note that the surface of the molten steel was sealed with argon at 1 atm. Molten steel with an initial carbon content of 0.03% was decarburized to 0.004% after treatment. This porous material pipe was immersed 20 cm into molten steel adjusted to the composition shown in Comparative Example 2 (■) in Table 2 in a 100 kg melting furnace, and the pressure inside the porous material pipe was reduced to 1-1 g using a vacuum pump. , decarburized.
処理後１５分で多孔質物質製パイプが侵食のため破損し
、脱炭処理を中断した。Fifteen minutes after the treatment, the porous material pipe broke due to erosion, and the decarburization treatment was interrupted.
第１表
〔発明の効果〕
本発明によれば、従来の脱ガス方法と比較して、溶融金
属の飛散がなく、容易に且つ確実に溶融金属の脱ガスが
でき、また、工業的規模で正確な脱ガスができる等の優
れた効果が奏される。Table 1 [Effects of the Invention] According to the present invention, compared to conventional degassing methods, molten metal can be easily and reliably degassed without scattering, and can be performed on an industrial scale. Excellent effects such as accurate degassing can be achieved.
第１図は本発明の脱ガス法の原理を示す説明図、第２図
は本発明の実施方法の一例を示す概要図である。
図中、１は容器、２は溶鋼、３は多孔質物質製パイプ、
４は真空ポンプ、５は一酸化炭素、６は酸化物質層であ
る。FIG. 1 is an explanatory diagram showing the principle of the degassing method of the present invention, and FIG. 2 is a schematic diagram showing an example of the method of implementing the present invention. In the figure, 1 is a container, 2 is molten steel, 3 is a porous material pipe,
4 is a vacuum pump, 5 is carbon monoxide, and 6 is an oxide layer.
Claims (1)
る多孔質物質の表面に酸化物質の層を形成し、その酸化
物質層の表面を溶融金属に接触させ、多孔質物質の他方
の面を減圧下に曝すことにより溶融金属が含有する炭素
を除去することを特徴とする溶融金属からの脱ガス方法
。A layer of oxidizing material is formed on the surface of a porous material that does not allow molten metal to pass through, but allows carbon monoxide gas to pass through, the surface of the oxidized material layer is brought into contact with the molten metal, and the other side of the porous material is depressurized. A method for degassing molten metal, characterized in that carbon contained in the molten metal is removed by exposing the molten metal to water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27500590A JPH04154907A (en) | 1990-10-13 | 1990-10-13 | Degassing method from molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27500590A JPH04154907A (en) | 1990-10-13 | 1990-10-13 | Degassing method from molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04154907A true JPH04154907A (en) | 1992-05-27 |
Family
ID=17549562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27500590A Pending JPH04154907A (en) | 1990-10-13 | 1990-10-13 | Degassing method from molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04154907A (en) |
-
1990
- 1990-10-13 JP JP27500590A patent/JPH04154907A/en active Pending
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