JPH0639658B2 - Electrode alloy for glass melting furnace - Google Patents
Electrode alloy for glass melting furnaceInfo
- Publication number
- JPH0639658B2 JPH0639658B2 JP21643085A JP21643085A JPH0639658B2 JP H0639658 B2 JPH0639658 B2 JP H0639658B2 JP 21643085 A JP21643085 A JP 21643085A JP 21643085 A JP21643085 A JP 21643085A JP H0639658 B2 JPH0639658 B2 JP H0639658B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- corrosion resistance
- melting furnace
- glass melting
- glass
- 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.)
- Expired - Fee Related
Links
Landscapes
- Discharge Heating (AREA)
- Glass Melting And Manufacturing (AREA)
- Furnace Details (AREA)
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は使用済核燃料の再処理によって発生する高レベ
ル廃液のガラス固化技術におけるガラス溶融炉に用いら
れる電極材料の改良に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement in an electrode material used in a glass melting furnace in a vitrification technique for high-level waste liquid generated by reprocessing spent nuclear fuel.
使用済核燃料に含まれる核分裂生成物など高レベルの放
射性物質は、再処理過程で核物質と分離され、廃液とし
て濃縮された後、種々の方法で固化され保存される。現
在、固化方法の１つとして、安全性、貯蔵性に優れたガ
ラス固化処理法が考られている。このガラス固化処理技
術については、各国において精力的な研究がなされてい
る。High-level radioactive materials such as fission products contained in spent nuclear fuel are separated from nuclear materials in the reprocessing process, concentrated as waste liquid, and then solidified and stored by various methods. At present, a vitrification treatment method which is excellent in safety and storability is considered as one of the consolidation methods. Vigorous studies have been conducted in various countries on this vitrification treatment technology.
ガラス固化処理技術のうちガラス溶融法としては、電極
から廃液及びガラス原料への直接通電により発生するジ
ュール熱を利用する方法がある。この電極は、１０００
℃以上の溶融ガラスという苛酷な腐食環境にさらされる
ことになるため、電極の寿命が溶融炉の寿命を決定する
大きな要因となっている。Among the glass solidification treatment techniques, the glass melting method includes a method of utilizing Joule heat generated by direct energization of waste liquid and glass raw material from electrodes. This electrode is 1000
Since the glass is exposed to the severe corrosive environment of molten glass at a temperature of ℃ or higher, the life of the electrode is a major factor in determining the life of the melting furnace.
従来、ガラス溶融炉の電極材料としては、金属モリブデ
ン、酸化スズ、黒鉛などが検討されてきたが、これらは
いずれも溶融ガラス中での耐食性に難点がある。このた
め現在では、種々検討の結果、比較的耐食性の優れたイ
ンコネル６９０がパイロットプラントなどに採用されて
いる。しかし、インコネル６９０の融点は約１３５０℃
であり、モリブデンなどと比較すると低いため、操炉条
件が限定されるという欠点がある。Heretofore, metallic molybdenum, tin oxide, graphite and the like have been studied as electrode materials for glass melting furnaces, but all of them have problems in corrosion resistance in molten glass. Therefore, as a result of various studies, Inconel 690, which is relatively excellent in corrosion resistance, is currently used in pilot plants and the like. However, the melting point of Inconel 690 is about 1350 ° C.
Since it is lower than that of molybdenum and the like, there is a drawback that the furnace operating conditions are limited.
本発明は上記欠点を解消するためになされたものであ
り、インコネル６９０と比較して同等以上の耐食性を有
し、しかも融点が少なくとも５０℃以上高いガラス溶融
炉用の電極材料を提供しようとするものである。The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an electrode material for a glass melting furnace which has corrosion resistance equal to or higher than that of Inconel 690 and has a melting point of at least 50 ° C or higher. It is a thing.
本発明のガラス溶融炉用電極合金は、重量％でCr：２５
〜５０％、Ni：１０〜４０％、Ｔｉ：0.1〜１％、Mo：
０．１〜１％、Al：０．００５〜０．５％、Si：０．０
１〜０．６％、Mn：０．１〜１．０％を含有し、残部が
実質的にFeからなる組成を有することを特徴とするもの
である。The electrode alloy for a glass melting furnace of the present invention contains Cr: 25 by weight%.
~ 50%, Ni: 10-40%, Ti: 0.1-1%, Mo:
0.1-1%, Al: 0.005-0.5%, Si: 0.0
1 to 0.6%, Mn: 0.1 to 1.0%, and the balance is substantially Fe.
このような合金は溶融ガラス中においてインコネル６９
０と同程度あるいは良好な耐食性を有し、しかもインコ
ネル６９０よりも融点が少なくとも５０℃以上高くな
る。Such alloys have been found in Inconel 69 in molten glass.
It has the same or better corrosion resistance as 0, and has a melting point higher than that of Inconel 690 by at least 50 ° C. or more.
以下、本発明において各成分の含有量を上記の範囲に限
定した理由を説明する。The reason why the content of each component is limited to the above range in the present invention will be described below.
Crは基本的に本発明に係る合金の耐食性を維持するため
の元素である。Crの組成を２５〜５０％としたのは、２
５％未満では溶融ガラス中での耐食性を維持することが
できず、一方５０％を超えると合金が脆くなり、加工性
が著しく低下するためである。Cr is basically an element for maintaining the corrosion resistance of the alloy according to the present invention. The reason why the Cr composition is 25 to 50% is 2
This is because if it is less than 5%, the corrosion resistance in the molten glass cannot be maintained, while if it exceeds 50%, the alloy becomes brittle and the workability is significantly reduced.
NiはCrとともに合金の耐食性を向上させ、かつ加工性を
向上させるための元素である。Niの含有量を１０〜４０
％としたのは、１０％未満では合金の耐食性及び加工性
を向上させることができず、一方４０％を超えると合金
の融点をインコネル６９０より上昇させることが困難と
なるためである。Ni, together with Cr, is an element for improving the corrosion resistance of the alloy and improving the workability. Ni content 10-40
%, The corrosion resistance and workability of the alloy cannot be improved if it is less than 10%, while if it exceeds 40%, it becomes difficult to raise the melting point of the alloy from Inconel 690.
Ti、Mo、Alはいずれは本発明に係る合金の溶融ガラス中
での耐食性を向上させる目的で添加される元素である。
このうち、Tiは特に重要である。Tiの添加量を０．１〜
１％としたのは、０．１％未満では合金の溶融ガラス中
での耐食性を向上させる効果が少なく、一方１％を超え
るとイータ相等が析出して合金の耐食性を劣化させるた
めである。Moも同様に０．１％未満では耐食性を向上さ
せる効果が少なく、１％を越えても効果が少なくなる。
Alの添加量を０．００５〜０．５％としたのは、０．０
０５％未満では合金の耐食性を向上させる効果が少な
く、一方０．５％を超えると反応生成物が生じ、合金表
面が脆化するためである。Ti, Mo, and Al are elements added for the purpose of improving the corrosion resistance of the alloy according to the present invention in molten glass.
Of these, Ti is particularly important. Addition amount of Ti is 0.1
The content of 1% is because if it is less than 0.1%, the effect of improving the corrosion resistance of the alloy in the molten glass is small, whereas if it exceeds 1%, the eta phase or the like precipitates and deteriorates the corrosion resistance of the alloy. Similarly, if Mo is less than 0.1%, the effect of improving the corrosion resistance is small, and if it exceeds 1%, the effect is small.
The reason why the amount of Al added is 0.005 to 0.5% is 0.0
This is because if it is less than 05%, the effect of improving the corrosion resistance of the alloy is small, while if it exceeds 0.5%, reaction products are generated and the alloy surface becomes brittle.
Siも本発明に係る合金の耐食性を向上させるために添加
される元素である。Siの添加量を０．０１〜０．６％と
したのは、０．０１％未満では合金の耐食性を向上させ
る効果が少なく、一方０．６％を超えると合金が脆化す
るためである。Si is also an element added to improve the corrosion resistance of the alloy according to the present invention. The amount of Si added is 0.01 to 0.6% because if it is less than 0.01%, the effect of improving the corrosion resistance of the alloy is small, and if it exceeds 0.6%, the alloy becomes brittle. .
Mnは合金の脱酸剤として添加される元素である。Mnの添
加量を０．１〜１％としたのは、０．１％未満では脱酸
剤としての効果が少なく、一方１％を超えると有害な金
属間化合物を生成するためである。Mn is an element added as a deoxidizer for alloys. The amount of Mn added is 0.1 to 1% because if it is less than 0.1%, the effect as a deoxidizer is small, and if it exceeds 1%, harmful intermetallic compounds are produced.
また、本発明に係る合金において、上記各元素以外の残
部は実質的にFe、すなわちFeとＰ、Ｓ、Sn等の不可避不
純物とからなるものである。残部をFeとしたのは、Cr−
Ni−Fe系合金はインコネル６９０よりも高い融点を有す
るためである。ただし、高い融点を得るためにはFeを１
５％以上とすることが望ましい。In addition, in the alloy according to the present invention, the balance other than the above elements is substantially Fe, that is, Fe and inevitable impurities such as P, S, and Sn. The balance of Fe is Cr-
This is because the Ni-Fe alloy has a melting point higher than that of Inconel 690. However, to obtain a high melting point, Fe should be 1
It is desirable to be 5% or more.
なお、本発明に係る合金において、強度を向上させる作
用を有するＣの添加量については特に限定しないが、Ｃ
の添加量が多すぎると粒界に粗大な炭化物が形成され、
耐食性が劣化するおそれがあるため、０．５％以下とす
ることが望ましい。In addition, in the alloy according to the present invention, the addition amount of C having an action of improving strength is not particularly limited.
If too much is added, coarse carbides will be formed at the grain boundaries,
Corrosion resistance may be deteriorated, so 0.5% or less is desirable.
下記表に示す組成を有する合金を溶製した。なお、比較
例１はインコネル６９０である。これらの合金について
浸漬試験を行ない、耐食性を評価した。この浸漬試験は
各合金をアルミナるつぼ内で１２７０℃の廃棄物模擬ガ
ラス中に７日間浸漬した後の減肉量を調べたものであ
る。また、各合金の融点も測定した。上記減肉量及び融
点を下記表に併記する。Alloys having the compositions shown in the table below were melted. Comparative Example 1 is Inconel 690. Immersion tests were performed on these alloys to evaluate the corrosion resistance. In this immersion test, each alloy was immersed in a waste simulated glass at 1270 ° C. in an alumina crucible for 7 days, and the amount of thinning was investigated. The melting point of each alloy was also measured. The above amount of thinning and the melting point are also shown in the following table.
上記表から明らかなように、実施例１〜４の合金はいず
れもインコネル６９０（比較例１）と比較して減肉量が
同程度あるいは少なく、耐食性に優れているとともに、
融点が５０〜６５℃上昇している。また、本発明の組成
からはずれている比較例２，３よりも減肉量が大幅に少
なく、耐食性に優れており、融点も高い。 As is clear from the above table, the alloys of Examples 1 to 4 all have the same or smaller amount of wall thinning as compared with Inconel 690 (Comparative Example 1), and have excellent corrosion resistance,
The melting point has risen by 50 to 65 ° C. Further, compared to Comparative Examples 2 and 3 which deviate from the composition of the present invention, the amount of thinning is significantly smaller, the corrosion resistance is excellent, and the melting point is high.
〔発明の効果〕 以上詳述した如く本発明によれば、耐食性が良好で、し
かも融点の高いガラス溶融炉用電極合金を提供すること
ができ、ひいてはガラス溶融炉の操炉条件を安定化でき
る等顕著な効果を奏するものである。[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an electrode alloy for a glass melting furnace, which has good corrosion resistance and a high melting point, and can stabilize the operating conditions of the glass melting furnace. It has a remarkable effect.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ２７Ｄ 11/08 Ａ 7141−4Ｋ Ｇ２１Ｆ 9/30 ５１９ Ｋ 9117−2Ｇ Ｈ０５Ｂ 7/06 8815−3Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location F27D 11/08 A 7141-4K G21F 9/30 519 K 9117-2G H05B 7/06 8815-3K
Claims (1)
０％、Mo：０．１〜１％、Ti：０．１〜１％、Al：０．
００５〜０．５％、Si：０．０１〜０．６％、Mn：０．
１〜１％を含有し、残部が実質的にFeからなる組成を有
することを特徴とするガラス溶融炉用電極合金。1. Cr: 25 to 50% and Ni: 10 to 4 by weight%
0%, Mo: 0.1 to 1%, Ti: 0.1 to 1%, Al: 0.
005 to 0.5%, Si: 0.01 to 0.6%, Mn: 0.
An electrode alloy for a glass melting furnace, which has a composition containing 1 to 1% and the balance being substantially Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21643085A JPH0639658B2 (en) | 1985-09-30 | 1985-09-30 | Electrode alloy for glass melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21643085A JPH0639658B2 (en) | 1985-09-30 | 1985-09-30 | Electrode alloy for glass melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6277445A JPS6277445A (en) | 1987-04-09 |
| JPH0639658B2 true JPH0639658B2 (en) | 1994-05-25 |
Family
ID=16688429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21643085A Expired - Fee Related JPH0639658B2 (en) | 1985-09-30 | 1985-09-30 | Electrode alloy for glass melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639658B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5897958B2 (en) * | 2012-03-30 | 2016-04-06 | 北陸電力株式会社 | Waste asbestos melting crucible |
-
1985
- 1985-09-30 JP JP21643085A patent/JPH0639658B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6277445A (en) | 1987-04-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |