JPH0231019B2 - - Google Patents
Info
- Publication number
- JPH0231019B2 JPH0231019B2 JP60214683A JP21468385A JPH0231019B2 JP H0231019 B2 JPH0231019 B2 JP H0231019B2 JP 60214683 A JP60214683 A JP 60214683A JP 21468385 A JP21468385 A JP 21468385A JP H0231019 B2 JPH0231019 B2 JP H0231019B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- molten
- degassing
- molten slag
- composition
- 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
- 239000002893 slag Substances 0.000 claims description 50
- 239000000203 mixture Substances 0.000 claims description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Furnace Details (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
（産業上の利用分野）
本発明は製鋼スラグ（以下単にスラグという）
中に含有するガスを迅速に除去し、嵩比重の大き
いスラグを得るための脱ガス法に関する。
（従来の技術）
通常、電気炉等による製鋼時に生成する溶融ス
ラグ中には比較的多量のガスが含有されている
が、従来はこのガスを積極的に除去することなく
ガス気泡が生じたままで冷却固化させるか、ある
いは発生したガスを一部抜き取る等の方法が行な
われている。
（発明が解決しようとする問題点）
しかし、ガスが包含されている溶融スラグをそ
のまま取鍋に出滓して冷却固化するときは、スラ
グの嵩比重が低下して容積が嵩高となるため、ス
ラグの取鍋を多く必要とし、輸送その他の取扱い
が不便であるほか、その取扱いに要する費用も割
高となるなどの欠点がある。又、従来のスラグは
大気中に放置しておくと速かに崩壊風化し、生成
した微粉により粉塵公害を惹き起す欠点がある。
本発明はかかる従来のスラグの欠点に着目して
なされたもので、溶融スラグに包含されるガスを
迅速に除去することにより、容積が小さく、微密
で崩壊風化の殆どないスラグを得ることを目的と
してなされたものである。
（問題点を解決するための手段）
すなわち、本発明は溶融製鋼スラグに、シリ
カ、酸化鉄、アルミ灰、塩化ナトリウム及びフツ
化カルシウムからなる配合組成物を添加すること
を特徴とする製鋼スラグの脱ガス法である。
本発明において、溶融スラグの脱ガス剤として
添加される配合組成物のうち、シリカ（SiO2）
としては川砂や鋳物砂等を使用することができ、
又、酸化鉄としては鉄鋼製品を製造する場合に、
鋳造、圧延、鍛造等の工程で発生するいわゆるス
ケールを使用することができる。第１表に使用さ
れるスケールの主な組成例を示した。
(Industrial Application Field) The present invention is directed to steelmaking slag (hereinafter simply referred to as slag).
This invention relates to a degassing method for quickly removing gas contained therein and obtaining slag with a large bulk specific gravity. (Prior art) Molten slag produced during steelmaking using an electric furnace or the like usually contains a relatively large amount of gas, but in the past, this gas was not actively removed and gas bubbles were left to form. Methods such as cooling and solidifying or extracting a portion of the generated gas are used. (Problems to be Solved by the Invention) However, when molten slag containing gas is directly poured into a ladle and cooled and solidified, the bulk specific gravity of the slag decreases and the volume becomes bulky. It requires a large number of slag ladles, making transportation and other handling inconvenient, and the handling costs are relatively high. Furthermore, if conventional slag is left in the atmosphere, it quickly disintegrates and weathers, and the resulting fine powder causes dust pollution. The present invention was made by focusing on the drawbacks of the conventional slag, and aims to obtain a slag with a small volume, minute density, and almost no disintegration and weathering by quickly removing the gas contained in the molten slag. It was done for a purpose. (Means for Solving the Problems) That is, the present invention provides a steelmaking slag characterized in that a blended composition consisting of silica, iron oxide, aluminum ash, sodium chloride, and calcium fluoride is added to molten steelmaking slag. This is a degassing method. In the present invention, silica (SiO 2 ) is added as a degassing agent for molten slag.
River sand, foundry sand, etc. can be used as
In addition, as iron oxide, when manufacturing steel products,
So-called scale generated in processes such as casting, rolling, and forging can be used. Table 1 shows examples of main compositions of scales used.
【表】
又、アルミ灰は金属アルミニウムの精錬時ある
いはアルミ屑等から金属アルミニウムを再生する
際に、溶融アルミニウムの表面に生成する物質
で、第２表にその主な組成例を示した。[Table] Aluminum ash is a substance generated on the surface of molten aluminum when refining metal aluminum or recycling metal aluminum from aluminum scraps, etc. Table 2 shows examples of its main composition.
【表】
さらに、塩化ナトリウム（NaCl）としては
NaCl純度96〜97wt％程度の原塩でよく、又、フ
ツ化カルシウム（CaF2）としては、ほたる石粉
末を使用することができる。第３表に使用される
ほたる石の主な組成例を示した。[Table] Furthermore, as sodium chloride (NaCl),
Raw salt with a NaCl purity of approximately 96 to 97 wt% may be used, and fluorite powder may be used as calcium fluoride ( CaF2 ). Table 3 shows examples of the main compositions of fluorite used.
【表】
又、これらの物質からなる脱ガス組成物の配合
割合は第４表に示される如くである。[Table] The blending ratio of the degassing composition made of these substances is as shown in Table 4.
【表】
又、脱ガス組成物の溶融スラグに対する添加割
合は、溶融スラグ1t当り約10〜12Kgである。
（作用）
上記の脱ガス組成物のスラグに対する添加は、
電気炉から溶融スラグを取鍋に出滓する際に行な
われる。
すなわち、先ず電気炉から取鍋にスラグが注入
されると、あたかももちが、焼かれた時のように
表面が大きく膨らむ。その時に、脱ガス組成物を
表面に投入すると、スラグ表面は磁1400〜1550℃
であつた温度が、脱ガス組成物がスラグ表面で拡
散して1700〜1800℃の高温に上昇する。それと同
時にスラグ表面に無数の尖孔を生じさせつつ激し
く反応してガスが噴出放散し、次いでスラグの膨
みは沈下する。続いて注入されるスラグは又膨張
を繰り返すので、その都度脱ガス組成物を一定量
投入する。
このような溶融スラグに対する脱ガス組成物の
投入によつてガスの噴出とスラグの沈下を１個の
取鍋に対して出滓が終了するまで数回繰り返すこ
とにより、溶融スラグ中のガスを迅速かつ完全に
除去することができ、同時に取鍋に出滓されたス
ラグは嵩比重の大きい微密なものとすることがで
きる。第５表に従来のスラグの嵩比重と本発明に
よつて処理されたスラグの嵩比重を示した。[Table] Further, the addition ratio of the degassing composition to the molten slag is about 10 to 12 kg per 1 ton of molten slag. (Function) The addition of the above degassing composition to the slag is
This is done when molten slag is tapped from an electric furnace into a ladle. That is, when slag is first poured into a ladle from an electric furnace, the surface swells up, just like when a rice cake is baked. At that time, when a degassing composition is poured onto the surface, the slag surface becomes magnetic at a temperature of 1400 to 1550℃.
The degassed composition diffuses on the slag surface and the temperature rises to a high temperature of 1700-1800°C. At the same time, numerous pores are created on the slag surface, a violent reaction occurs, and gas is ejected and dissipated, and then the swelling of the slag sinks. Since the slag that is subsequently injected repeatedly expands, a certain amount of the degassing composition is added each time. The gas in the molten slag can be rapidly removed by injecting the degassing composition into the molten slag and repeating the ejection of gas and the sinking of the slag several times in one ladle until the slag is finished. Moreover, the slag can be completely removed, and at the same time, the slag discharged into the ladle can be finely slag with a large bulk specific gravity. Table 5 shows the bulk specific gravity of the conventional slag and the bulk specific gravity of the slag treated according to the present invention.
【表】
本発明により溶融スラグの脱ガスが迅速に達成
される理由は、溶融スラグの出滓時の温度が1400
〜1550℃であるのに対し、脱ガス組成物が投入さ
れた溶融スラグ温度は1700〜1800℃の高温に上昇
するためである。このような溶融スラグの温度上
昇は、アルミ灰中の金属アルミニウム（M.Al）
とスケール中のFe2O3，Fe3O4，FeO等の間の次
式のいわゆるテルミツト反応
2Al＋Fe2O3→
2Fe＋Al2O3＋反応熱
2Al＋３／4Fe3O4→
９／4Fe＋Al2O3＋反応熱
2Al＋3FeO→
3Fe＋Al2O3＋反応熱
と同時に、CaF2とNaCl間の次式の置換反応
CaF2＋2NaCl→
2NaF＋CaCl2＋反応熱
が溶融スラグとの接触により瞬時的に進行し、こ
れらの反応によつて発生する多大の反応熱の付加
により、溶融スラグの温度上昇が急速に行なわれ
るためと考えられる。
又、ほたる石（CaF2）はスラグの融剤として、
その流動性を高める作用をも有しており、砂
（SiO2）の添加も溶融スラグの流動性を向上させ
せると共に、スラグ中の遊離生石灰（CaO）と反
応して安定なｒ−2CaO・SiO2を生成させ、スラ
グの崩壊風化を防止する作用を有する。
（発明の効果）
以上詳細に説明したように、本発明によれば取
鍋に出滓される溶融スラグの脱ガスが瞬時にほぼ
完全に行なわれるため、冷却固化時のスラグは嵩
比重が大きく容積が小となり組織も微密となる。
従つて、従来１チヤージ当り３個必要とした取
鍋が、本発明によれば２個の節減することが可能
となり、又、取扱いも便利でスラグ処理費を大幅
に低減することができる。
又、本発明によつて得られるスラグは崩壊風化
が止され、大気中に放置した場合にも粉塵公害等
を起すことがない。さらに本発明に使用される配
合組成物は大部分産業廃棄物として処理される物
質を活用できるから、極めて安価なコストで実施
することができる等の利点がえられる。[Table] The reason why the present invention achieves rapid degassing of molten slag is that the temperature at the time of slag discharge is 1400°C.
This is because the temperature of the molten slag into which the degassed composition is added rises to a high temperature of 1700 to 1800°C, whereas the temperature is 1550°C. Such temperature rise of molten slag is due to the increase in the temperature of metallic aluminum (M.Al) in aluminum ash.
The so-called thermite reaction between Fe 2 O 3 , Fe 3 O 4 , FeO, etc. in the scale and the following equation 2Al + Fe 2 O 3 → 2Fe + Al 2 O 3 + heat of reaction 2Al + 3/4Fe 3 O 4 → 9/4Fe + Al 2 O 3 + heat of reaction 2Al + 3FeO → 3Fe + Al 2 O 3 + At the same time as the heat of reaction, the following displacement reaction between CaF 2 and NaCl CaF 2 + 2NaCl → 2NaF + CaCl 2 + heat of reaction proceeds instantaneously due to contact with the molten slag, and these This is thought to be because the temperature of the molten slag rapidly increases due to the addition of a large amount of reaction heat generated by the reaction. In addition, fluorite (CaF 2 ) is used as a fluxing agent for slag.
It also has the effect of increasing the fluidity of molten slag, and the addition of sand (SiO 2 ) also improves the fluidity of molten slag, and it also reacts with free quicklime (CaO) in the slag to create stable r-2CaO. It generates SiO 2 and has the effect of preventing slag from collapsing and weathering. (Effects of the Invention) As explained in detail above, according to the present invention, the molten slag discharged into the ladle is instantly and almost completely degassed, so that the slag has a large bulk specific gravity when solidified by cooling. The volume becomes smaller and the structure becomes finer. Therefore, according to the present invention, the number of ladles required per charge can be reduced to two, whereas the conventional method requires three ladles per charge.In addition, handling is convenient and slag processing costs can be significantly reduced. Moreover, the slag obtained by the present invention is prevented from collapsing and weathering, and does not cause dust pollution even when left in the atmosphere. Furthermore, since the compounded composition used in the present invention can utilize materials that are mostly treated as industrial waste, it has the advantage that it can be implemented at extremely low cost.
Claims (1)
灰、塩化ナトリウム及びフツ化カルシウムからな
る配合組成物を添加することを特徴とする製鋼ス
ラグの脱ガス法。1. A method for degassing steelmaking slag, which comprises adding to molten steelmaking slag a blended composition consisting of silica, iron oxide, aluminum ash, sodium chloride, and calcium fluoride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60214683A JPS6278134A (en) | 1985-09-30 | 1985-09-30 | Degasification for steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60214683A JPS6278134A (en) | 1985-09-30 | 1985-09-30 | Degasification for steel slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6278134A JPS6278134A (en) | 1987-04-10 |
| JPH0231019B2 true JPH0231019B2 (en) | 1990-07-11 |
Family
ID=16659851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60214683A Granted JPS6278134A (en) | 1985-09-30 | 1985-09-30 | Degasification for steel slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6278134A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4992819A (en) * | 1989-10-31 | 1991-02-12 | Canon Kabushiki Kaisha | Focus detecting device having a plurality of detecting areas and camera provided with the same |
| JP5205262B2 (en) * | 2005-07-29 | 2013-06-05 | タータ スチール リミテッド | Method for converting basic oxygen furnace slag into construction material |
-
1985
- 1985-09-30 JP JP60214683A patent/JPS6278134A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6278134A (en) | 1987-04-10 |
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