JPH0231637B2 - SABUMAAJIAAKUYOSETSUYOYOJUGATAFURATSUKUSUNOSEIZOHOHO - Google Patents
SABUMAAJIAAKUYOSETSUYOYOJUGATAFURATSUKUSUNOSEIZOHOHOInfo
- Publication number
- JPH0231637B2 JPH0231637B2 JP2354383A JP2354383A JPH0231637B2 JP H0231637 B2 JPH0231637 B2 JP H0231637B2 JP 2354383 A JP2354383 A JP 2354383A JP 2354383 A JP2354383 A JP 2354383A JP H0231637 B2 JPH0231637 B2 JP H0231637B2
- Authority
- JP
- Japan
- Prior art keywords
- mno
- content
- melting
- weight
- reduced
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings or fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Description
本発明は、原料溶解に要する消費電力原単位を
低減し得ると共に、溶製用電気炉の損耗を最小限
に抑制しつつ、高品質のサブマージアーク溶接用
溶融型フラツクスを製造する方法に関するもので
ある。
サブマージアーク溶接用溶融型フラツクス（以
下単にフラツクスということがある）は、MnO、
SiO2、CaO、CaF2等の溶製原料を電気炉等で溶
融混合し、冷却後適当な方法で粉砕することによ
つて製造される。ところで上記溶製原料のうち
MnOは、溶融フラツクスの塩基度調整剤として
不可欠のものであると共に、溶融混合系への酸素
供給剤として作用することにより、不純混入物で
ある硫黄成分を酸化除去する成分としても欠くこ
とのできないものである。この様なMnO源とし
ては例えばバイロルース鉱やブラウン鉱、スイマ
ンガン鉱等のMnO2含有鉱石が用いられており、
これら、鉱物のMnO2含有率は一般に60重量％程
度以上であつて、純度的には殆んど問題にされた
ことがなかつた。しかし本発明者等が種々研究を
行なつたところ、MnO2含有率の高いことが逆に
災いの元となり、他のフラツクス原料との溶融混
合工程で種々の問題を生じていることが確認され
た。その問題とは高MnO2鉱物の配合によつて生
ずる過剰酸素供給に起因するものであり、溶製
段階でMnO2をMnOに変換して安定化させるの
に相当の電力及び時間を費していること、溶製
段階で発生する大量の酸素によつて溶解炉のカー
ボンライニング層が著しく酸化消耗し、炉材の原
単位が高まること、大量に発生する酸素と系中
のSi4+とが電離状態のCaF2と反応してCaOや
SiF4を生成し、CaF2の歩留りが低下して製品の
成分組成が不正確になる、等の問題を生ずる。
本発明者等はこうした事情に着目し、過剰酸素
に起因する問題を解消すべく研究を進めてきた。
その結果、MnO2含有率の高い二酸化マンガン鉱
石を事前に還元処理し、MnO2含有率を低減させ
た後他のフラツクス原料と共に混合溶融すれば上
記の目的が簡単に達成されることを知り、茲に本
発明を完成した。即ち本発明に係るサブマージア
ーク溶接用溶融型フラツクスの製造方法とは、
MnO2含有率が60重量％以上である二酸化マンガ
ン鉱石を還元してMnO2含有率を20〜35重量％ま
で低減せしめ、これをMnO源として他のフラツ
クス原料と共に混合溶融させるところに要旨が存
在する。
本発明では、前述の様にMnO2含有率が60重量
％程度である二酸化マンガン鉱石を、適当な焙焼
装置等を用いて還元雰囲気中で加熱還元し、
MnO2含有率を20〜35重量％に低減させる。この
ときの処理温度は格別制限されないが、還元効
率、還元効率と焙焼設備のライフ、フラツクス溶
製時の生産性等を総合的に考慮すれば900〜1250
℃の範囲が最適である。この熱処理によつて鉱石
中のMnO2の一部は還元されてMnOに変換する
と共に、付着水分や結晶水等も揮発除去されるの
で、次いで行なわれる溶製段階で発生する酸素や
水分等の量を大幅に低減させることができる。従
つて発生酸素による炭素質炉材の酸化消耗が抑制
され炉材の補修頻度を大幅に少なくすることがで
きると共に、上記発生ガスと共に系外へ放出され
る高蒸気圧成分（CaF2等）のロスが減少しその
歩留りを高めることができる。しかも上記の発生
ガスによるバブリング現象も少なくなるから、溶
解所要時間も短縮される。加えて溶融混合工程で
MnO2をMnOに変換する為のエネルギーも減少
するから、溶融処理に要する電力原単位も少なく
することができる。こうした効果を確保する為に
は前記予備還元工程で原料鉱石のMnO2含有率を
35重量％以下まで低下させておかなければならな
い。しかしMnO2含有率を20重量％未満まで低下
させると、溶製段階における脱硫効果が不十分と
なり製品フラツクスの品質が低下する。即ち
MnO2は、先にも説明した様に原料中の硫黄を酸
化除去する為の酸素供与成分としても極めて重要
であり、脱硫反応を十分に進行させる為には溶製
処理系におけるO2／Ｓ（モル比）を５以上としな
ければならず、こうした作用を有効に発揮させる
為には20重量％以上のMnO2を残しておく必要が
ある。
ちなみに後記第２〜４表は、第１表に示す配合
組成のフラツクスＡ，Ｂ，Ｃを溶製するに当り、
MnO源としてMnO2含有率の異なるものを用い
た場合の電力原単位内張りカーボンの消費量、
CaF2の歩留り等に与える影響を示したものであ
る。
The present invention relates to a method for manufacturing high-quality molten flux for submerged arc welding while reducing the power consumption unit required for melting raw materials and minimizing wear and tear on the melting electric furnace. be. Melting flux for submerged arc welding (hereinafter simply referred to as flux) is made of MnO,
It is manufactured by melting and mixing molten raw materials such as SiO 2 , CaO, CaF 2 in an electric furnace or the like, and pulverizing them by an appropriate method after cooling. By the way, among the above raw materials for melting,
MnO is indispensable as a basicity regulator for molten flux, and also as an indispensable component for oxidizing and removing sulfur components, which are impurities, by acting as an oxygen supply agent to the molten mixing system. It is something. As such a MnO source, for example, MnO2- containing ores such as biroluthite, brownite, and suimangite are used.
The MnO 2 content of these minerals is generally about 60% by weight or more, and purity has rarely been a problem. However, the inventors of the present invention have conducted various studies, and it has been confirmed that the high MnO 2 content is actually a source of disaster, causing various problems in the melt-mixing process with other flux raw materials. Ta. The problem is due to excess oxygen supply caused by the blending of high MnO 2 minerals, and it takes considerable power and time to convert and stabilize MnO 2 to MnO during the melting stage. The carbon lining layer of the melting furnace is significantly oxidized and consumed by the large amount of oxygen generated during the melting process, increasing the unit consumption of the furnace material . Reacts with ionized CaF2 to form CaO and
SiF 4 is produced, which causes problems such as a decrease in the yield of CaF 2 and an inaccurate component composition of the product. The present inventors have focused on these circumstances and have conducted research to solve the problems caused by excess oxygen.
As a result, we learned that the above purpose could be easily achieved by reducing the manganese dioxide ore with a high MnO 2 content in advance, reducing the MnO 2 content, and then mixing and melting it with other flux raw materials. The present invention has finally been completed. That is, the method for producing a molten flux for submerged arc welding according to the present invention is as follows:
The gist is that manganese dioxide ore with an MnO 2 content of 60% by weight or more is reduced to reduce the MnO 2 content to 20 to 35% by weight, and this is mixed and melted with other flux raw materials as a MnO source. do. In the present invention, as mentioned above, manganese dioxide ore with a MnO 2 content of about 60% by weight is heated and reduced in a reducing atmosphere using an appropriate roasting device, etc.
Reduce MnO2 content to 20-35% by weight. The processing temperature at this time is not particularly limited, but if the reduction efficiency, reduction efficiency, life of roasting equipment, productivity during flux melting, etc. are comprehensively considered,
℃ range is optimal. Through this heat treatment, a part of the MnO 2 in the ore is reduced and converted to MnO, and adhering moisture and crystal water are also volatilized and removed, so oxygen and moisture generated in the next melting step are removed. The amount can be significantly reduced. Therefore, the oxidative consumption of the carbonaceous furnace material due to the generated oxygen is suppressed, and the frequency of repair of the furnace material can be significantly reduced.In addition, the high vapor pressure components (CaF 2 , etc.) released to the outside of the system along with the generated gas are reduced. Loss can be reduced and the yield can be increased. Furthermore, since the bubbling phenomenon caused by the above-mentioned generated gas is reduced, the time required for dissolution is also shortened. In addition, in the melt mixing process
Since the energy required to convert MnO 2 to MnO is also reduced, the power unit required for the melting process can also be reduced. In order to ensure these effects, the MnO 2 content of the raw ore must be reduced in the preliminary reduction process.
The content must be reduced to 35% by weight or less. However, when the MnO 2 content is lowered to less than 20% by weight, the desulfurization effect in the melting stage becomes insufficient and the quality of the product flux deteriorates. That is,
As explained earlier, MnO 2 is extremely important as an oxygen donating component for oxidizing and removing sulfur in raw materials, and in order for the desulfurization reaction to proceed sufficiently, O 2 /S in the melt processing system is required. (molar ratio) must be 5 or more, and in order to effectively exhibit this effect, it is necessary to leave 20% by weight or more of MnO 2 . Incidentally, Tables 2 to 4 below show that when melting fluxes A, B, and C having the composition shown in Table 1,
Consumption of lining carbon per unit power consumption when using MnO sources with different MnO 2 contents,
This shows the influence on the yield etc. of CaF 2 .
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】
第２〜４表からも明らかな様に、MnO2含有率
を20重量％未満まで低減させた二酸化マンガン鉱
石を使用すると、溶製工程におけるO2／Ｓ比が
不足気味となつて脱硫不足が起こり、一方35重量
％を越えると電力及び時間の原単位が増大すると
共に、内張り耐火物であるカーボンペーストの消
耗量が著しく増大し、且つCaF2の歩留りも低下
する。これに対しMnO2量を20〜35重量％の範囲
まで予備還元した二酸化マンガン鉱石を使用する
と、脱硫不足を生ずることなく電力及び時間の原
単位及びカーボンペーストの消耗量を低レベルに
抑制し得ると共にCaF2の歩留を大幅に高めるこ
とができる。
本発明は概略以上の様に構成されており、二酸
化マンガン鉱石を予備還元してMnO2含有率を所
定範囲まで低下させておくことにより、脱硫不足
による品質低下を生ずることなく前述の様な多く
の利益を享受し得ることになつた。[Table] As is clear from Tables 2 to 4, when manganese dioxide ore with MnO 2 content reduced to less than 20% by weight is used, the O 2 /S ratio in the melting process tends to be insufficient. Insufficient desulfurization occurs, and on the other hand, if it exceeds 35% by weight, the consumption of electric power and time increases, the amount of carbon paste used as a refractory lining increases significantly, and the yield of CaF 2 also decreases. On the other hand, by using manganese dioxide ore in which the amount of MnO 2 has been pre-reduced to a range of 20 to 35% by weight, it is possible to suppress the power and time consumption and consumption of carbon paste to low levels without causing insufficient desulfurization. At the same time, the yield of CaF 2 can be significantly increased. The present invention is roughly constructed as described above, and by pre-reducing manganese dioxide ore to lower the MnO 2 content to a predetermined range, it can be used to reduce the quality of the manganese dioxide ore without causing quality deterioration due to insufficient desulfurization. The company was able to enjoy the benefits of
Claims (1)
ンガン鉱石を還元してMnO2含有率を20〜35重量
％に低減せしめ、これをMnO源とし他のフラツ
クス原料と共に混合溶融させることを特徴とする
サブマージアーク溶接用溶融型フラツクスの製造
方法。1. A method characterized by reducing manganese dioxide ore with an MnO 2 content of 60% by weight or more to reduce the MnO 2 content to 20 to 35% by weight, and using this as a MnO source and mixing and melting it with other flux raw materials. A method for manufacturing a molten flux for submerged arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2354383A JPH0231637B2 (en) | 1983-02-14 | 1983-02-14 | SABUMAAJIAAKUYOSETSUYOYOJUGATAFURATSUKUSUNOSEIZOHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2354383A JPH0231637B2 (en) | 1983-02-14 | 1983-02-14 | SABUMAAJIAAKUYOSETSUYOYOJUGATAFURATSUKUSUNOSEIZOHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59147796A JPS59147796A (en) | 1984-08-24 |
| JPH0231637B2 true JPH0231637B2 (en) | 1990-07-16 |
Family
ID=12113380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2354383A Expired - Lifetime JPH0231637B2 (en) | 1983-02-14 | 1983-02-14 | SABUMAAJIAAKUYOSETSUYOYOJUGATAFURATSUKUSUNOSEIZOHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0231637B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2781266B2 (en) * | 1990-10-12 | 1998-07-30 | 川崎製鉄株式会社 | Method for producing molten low-density specific gravity flux for welding |
| JP4783708B2 (en) * | 2006-10-12 | 2011-09-28 | 日鐵住金溶接工業株式会社 | Fused flux for submerged arc welding |
-
1983
- 1983-02-14 JP JP2354383A patent/JPH0231637B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59147796A (en) | 1984-08-24 |
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