JPH06206743A - Modification of steel-making slag - Google Patents
Modification of steel-making slagInfo
- Publication number
- JPH06206743A JPH06206743A JP163393A JP163393A JPH06206743A JP H06206743 A JPH06206743 A JP H06206743A JP 163393 A JP163393 A JP 163393A JP 163393 A JP163393 A JP 163393A JP H06206743 A JPH06206743 A JP H06206743A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- free cao
- steam
- slag
- temperature
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、遊離ＣａＯを含む転炉
スラグ等の製鋼スラグの改質方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reforming steelmaking slag such as converter slag containing free CaO.
【０００２】[0002]
【従来の技術】転炉スラグ等の製鋼スラグは遊離ＣａＯ
を多く含むため、水と接触してＣａ（ＯＨ）2 となり、
体積は、約２倍に膨張する。従って、遊離ＣａＯを多く
含むスラグを路盤材等に使用した場合、水と接触するこ
とによる膨張のためスラグが徐々に崩壊し、この結果、
路面に凹凸を生じて、車輌の走行に支障を生じることと
なる。2. Description of the Related Art Steelmaking slag such as converter slag is free of CaO.
Since it contains a lot of, it becomes Ca (OH) 2 on contact with water,
The volume expands about twice. Therefore, when a slag containing a large amount of free CaO is used as a roadbed material or the like, the slag gradually collapses due to expansion caused by contact with water, and as a result,
As a result, unevenness will occur on the road surface, which will hinder the running of the vehicle.
【０００３】このような製鋼スラグの異常膨張の原因と
なる遊離ＣａＯを減らすための方策として、次の二つの
方法が従来から知られている。 （１）エージング処理方法 この処理は、徐冷した製鋼スラグを粗砕・粒度調整後、
野外で山積みし、３〜６カ月以上放置して雨水等により
水和反応等を行わせることにより、遊離ＣａＯを安定化
させる大気エージング処理であり、通常行われている方
法である。 （２）熱間改質処理方法 この処理は、溶融状態のスラグに珪酸質材料等を添加し
て、遊離ＣａＯをＳｉＯ2 、Ａｌ2 Ｏ3 等と反応させる
ことにより、膨張しない安定鉱物相に変える熱間改質処
理である。The following two methods have been conventionally known as measures for reducing free CaO that causes such abnormal expansion of steelmaking slag. (1) Aging treatment method In this treatment, the slowly cooled steelmaking slag is crushed and the particle size is adjusted.
It is an atmospheric aging treatment for stabilizing free CaO by stacking it outdoors and allowing it to stand for 3 to 6 months or more to cause a hydration reaction with rainwater or the like, which is a commonly used method. (2) Hot reforming treatment method In this treatment, a siliceous material or the like is added to molten slag and free CaO is reacted with SiO 2 , Al 2 O 3 or the like to form a stable mineral phase that does not expand. It is a hot reforming process that changes.
【０００４】上記（１）のエージング処理方法では、粗
砕・粒度調整した製鋼スラグを、長期間野外に山積みし
て放置するため、エージング処理に非常に長期間を要す
ると共に、製鉄所内に山積みするための非常に広いスペ
ースが必要とされるという問題点がある。この問題点を
改善するために、フミン酸、硫酸などを利用して、遊離
ＣａＯを安定化させることによりエージング処理の省略
を図った技術が知られている（特公昭５２−４４２８１
号公報、特開昭５８−１６７７０９号公報参照）。In the aging treatment method of the above (1), the steelmaking slag, which has been subjected to coarse crushing and particle size adjustment, is piled up in the open field for a long period of time and left for a long time. There is a problem in that a very large space is needed. In order to improve this problem, there is known a technique in which humic acid, sulfuric acid and the like are used to stabilize free CaO so as to omit the aging treatment (Japanese Patent Publication No. 52-42881).
Japanese Patent Laid-Open No. 58-167709).
【０００５】[0005]
【発明が解決しようとする課題】しかし、製鋼スラグ内
での遊離ＣａＯの存在状態は一様ではなく、スラグの塊
の粗粒内に取り込まれる等されているため、上記のフミ
ン酸、硫酸などを利用した方法では、完全に遊離ＣａＯ
を安定化させることはできないという問題がある。However, the presence state of free CaO in the steelmaking slag is not uniform and is taken into the coarse particles of the slag mass, so that the above-mentioned humic acid, sulfuric acid, etc. In the method using, completely free CaO
There is a problem that cannot be stabilized.
【０００６】本発明は、上記事情に鑑み、遊離ＣａＯを
安定化させるためのエージング処理時間を画期的に短く
する製鋼スラグの改質方法を提供することを目的とす
る。In view of the above circumstances, it is an object of the present invention to provide a method for reforming steelmaking slag, which dramatically shortens the aging treatment time for stabilizing free CaO.
【０００７】[0007]
【課題を解決するための手段】本発明者は上記目的を達
成するために、種々の実験・研究を行った結果、製鋼ス
ラグを水蒸気雰囲気中、より好適には水蒸気とＣＯ2 ガ
スとの混合雰囲気中にて処理することにより、この製鋼
スラグ中に含まれる遊離ＣａＯをＣａ（ＯＨ） 2 、Ｃａ
ＣＯ3 として安定化し、路盤材等として使用した際の膨
張を減少できることを見い出し、本発明をなすに至っ
た。Means for Solving the Problems The present inventors have achieved the above object.
As a result of various experiments and research conducted to
The rag is in a steam atmosphere, more preferably steam and CO2 Moth
This steelmaking by processing in a mixed atmosphere with
Free CaO contained in slag is Ca (OH) 2 , Ca
CO3 Stabilized as a
Found that the tension can be reduced, leading to the present invention.
It was
【０００８】具体的には、本発明の製鋼スラグの改質方
法は、遊離ＣａＯを含む製鋼スラグを粉砕し、この粉砕
した製鋼スラグを、圧力が１．２ｋｇ／ｃｍ2 以上、温
度が８０℃以上の水蒸気雰囲気中で加圧・加熱処理する
ことを特徴とするものである。ここで、対象となる遊離
ＣａＯを含む製鋼スラグには、転炉スラグだけでなく、
遊離ＣａＯを含む例えば予備処理スラグから製鋼段階で
の取鍋スラグ、連鋳造塊スラグ、さらに、電気炉スラグ
まで含まれる。Specifically, the method for reforming a steelmaking slag of the present invention crushes a steelmaking slag containing free CaO, and the crushed steelmaking slag has a pressure of 1.2 kg / cm 2 or more and a temperature of 80 ° C. It is characterized in that pressure and heat treatments are carried out in the above steam atmosphere. Here, not only the converter slag but also the target steelmaking slag containing free CaO
Examples include pretreatment slag containing free CaO, ladle slag at the steelmaking stage, continuous cast slag, and electric furnace slag.
【０００９】また、前記水蒸気にＣＯ2 ガスを加えた混
合雰囲気中で処理する方が好ましい。また、本発明にお
いて、製鋼スラグは水蒸気雰囲気中、より好適には水蒸
気とＣＯ2 の混合雰囲気中で処理されるが、その他に空
気の混入等があっても何ら差し支えない。ただし効率的
に遊離ＣａＯを改質するためには、気相中に占める水蒸
気の含有量、あるいは、水蒸気とＣＯ2 の合計含有量は
５０ｖｏｌ％以上であることが望ましい。その他の雰囲
気ガス成分としては、処理条件によっては、空気等の混
入等があり得るが、そうした場合も本発明の範囲内であ
る。さらに、本発明での通常の処理の場合、被処理物の
固相のスラグ、気相の水蒸気、ＣＯ2 ガス等の他に液相
として水が存在するが、この場合も本発明の範囲内であ
る。Further, it is preferable to perform the treatment in a mixed atmosphere in which CO 2 gas is added to the steam. Further, in the present invention, the steelmaking slag is treated in a steam atmosphere, more preferably in a mixed atmosphere of steam and CO 2 , but there is no problem even if air is mixed in. However, in order to efficiently reform free CaO, the content of water vapor in the gas phase or the total content of water vapor and CO 2 is preferably 50 vol% or more. Other atmospheric gas components may include air and the like depending on the processing conditions, and such a case is also within the scope of the present invention. Furthermore, in the case of the usual treatment of the present invention, water is present as a liquid phase in addition to the solid phase slag of the object to be treated, vapor of water vapor, CO 2 gas, etc., but this case is also within the scope of the present invention. Is.
【００１０】[0010]
【作用】上述したように、転炉スラグ等の製鋼スラグ中
の遊離ＣａＯの存在状態としては、スラグの塊の表面に
存在したり、塊の内部に取り囲まれたりして存在する
等、その存在状態は様々である。このため、路盤材とし
て遊離ＣａＯを含む製鋼スラグを利用した場合の膨張現
象を非常に複雑なものとしている。単なる常圧の水蒸気
処理では、スラグの塊の内部に取り囲まれて存在してい
る遊離ＣａＯを安定化するのが困難であったが、本発明
の製鋼スラグの改質方法によれば、水蒸気中、または水
蒸気とＣＯ2 ガスとの混合雰囲気中において、常圧より
も高い圧力で加圧処理を施すことにより、上述のような
スラグ粒内部に取り囲まれて存在している遊離ＣａＯも
非常に効率よく安定化させることができる。As described above, the presence state of free CaO in steelmaking slag such as converter slag is such that it exists on the surface of the lump of slag or is surrounded by the inside of the lump. There are various states. Therefore, the expansion phenomenon when using steelmaking slag containing free CaO as the roadbed material is very complicated. It was difficult to stabilize the free CaO that is present by being surrounded by the inside of the slag lump by simply performing atmospheric pressure steam treatment. However, according to the method for modifying the steelmaking slag of the present invention, , Or in a mixed atmosphere of water vapor and CO 2 gas, by applying a pressure treatment at a pressure higher than atmospheric pressure, the free CaO surrounded by the slag particles as described above is also very efficient. Can be well stabilized.
【００１１】本発明の製鋼スラグの改質方法では、遊離
ＣａＯを含む製鋼スラグを水蒸気中、より好適には水蒸
気とＣＯ2 ガスとの混合雰囲気中で処理するが、水蒸気
とＣＯ2 に限定する理由は、遊離ＣａＯをＣａ（ＯＨ）
2 、又はＣａ（ＯＨ）2 とＣａＣＯ3 に代えて安定化さ
せるための必須の雰囲気の雰囲気成分であるからであ
る。In the method for reforming the steelmaking slag of the present invention, the steelmaking slag containing free CaO is treated in steam, more preferably in a mixed atmosphere of steam and CO 2 gas, but it is limited to steam and CO 2 . The reason is that free CaO is converted to Ca (OH)
2 or Ca (OH) 2 and CaCO 3 instead of Ca (OH) 2 and CaCO 3 because they are essential atmospheric components for stabilization.
【００１２】また、本発明においては、前述のように、
水蒸気雰囲気中あるいは、水蒸気とＣＯ2 ガスとの混合
雰囲気中で処理するが、その雰囲気の圧力を１．２ｋｇ
／ｃｍ2 以上とし、温度を８０℃以上にする理由は、遊
離ＣａＯを水蒸気、ＣＯ2 ガスによって効率的にＣａ
（ＯＨ）2 、ＣａＣＯ3 に安定化させるためには、圧力
を高くすることと温度を上げることは非常に有効だから
である。Further, in the present invention, as described above,
The treatment is carried out in a steam atmosphere or in a mixed atmosphere of steam and CO 2 gas, and the pressure of the atmosphere is 1.2 kg.
/ Cm 2 or more and the temperature is 80 ° C. or more because free CaO is efficiently converted to Ca by steam or CO 2 gas.
This is because increasing the pressure and increasing the temperature are very effective in stabilizing to (OH) 2 and CaCO 3 .
【００１３】圧力を１．２ｋｇ／ｃｍ2 にするのは、圧
力が１．２ｋｇ／ｃｍ2 よりも低い場合は、遊離ＣａＯ
を安定化させるのに時間を要し、効率的でないからであ
る。圧力の上限については、本発明においては、特に限
定されないが、高圧ガス取締法上の制約などから１０ｋ
ｇ／ｃｍ2 よりも低い圧力で実施するのがより好適であ
る。また、コスト面からも設備面からも非常に有利に生
産できる。[0013] to the pressure to 1.2 kg / cm 2, when the pressure is lower than 1.2 kg / cm 2, the free CaO
It takes time to stabilize and is not efficient. The upper limit of the pressure is not particularly limited in the present invention, but it is 10 k due to restrictions on the High Pressure Gas Control Law and the like.
It is more preferred to carry out at a pressure lower than g / cm 2 . In addition, it is possible to produce a very advantageous product in terms of cost and equipment.
【００１４】雰囲気の温度として８０℃以上とするが、
この温度よりも低いと遊離ＣａＯを安定化させるのに長
時間を要するからである。雰囲気の上限温度について
は、本発明においては、特に限定されないが、１０ｋｇ
／ｃｍ2 未満の圧力で水が共存する密閉系の装置内で処
理する場合は、その飽和水蒸気圧を考慮すると１８０℃
が上限となる。The temperature of the atmosphere is 80 ° C. or higher,
This is because if the temperature is lower than this temperature, it takes a long time to stabilize free CaO. The upper limit temperature of the atmosphere is not particularly limited in the present invention, but is 10 kg.
180 ° C when the saturated steam pressure is taken into consideration when processing in a closed system where water coexists at a pressure of less than 1 / cm 2.
Is the upper limit.
【００１５】本発明において使用されるＣＯ2 ガスとし
ては、ボイラー排ガス、加熱炉排ガスなどＣＯ2 を１０
％以上含有するガスを使用することができ、効率よく改
質できるのみならず、経済的にも本発明の有効性を最大
限に発揮させることができる。As the CO 2 gas used in the present invention, CO 2 such as boiler exhaust gas and heating furnace exhaust gas is used.
%, It is possible to use a gas containing not less than 100%, so that not only can the gas be efficiently reformed, but the effectiveness of the present invention can be maximized economically.
【００１６】[0016]
【実施例】次に、本発明の実施例を比較例と共に、表を
参照して説明する。表１は本実施例の実験に供したスラ
グの成分を示し、２５ｍｍ以下に粉砕した磁選後の転炉
スラグを大量に採取し、化学分析を行った結果である。EXAMPLES Next, examples of the present invention will be described together with comparative examples with reference to tables. Table 1 shows the components of the slag used in the experiment of this example, and is a result of chemical analysis of a large amount of the converter slag after magnetic separation crushed to 25 mm or less.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１からわかるように、このスラグは、遊
離ＣａＯの量が９．５ｗｔ％、塩基度（ＣａＯ／ＳｉＯ
2 ）が４．９の転炉スラグである。このスラグに、表２
に示す温度、雰囲気、圧力条件下で種々改質処理を施し
た。改質処理のための装置として内部が高耐食性のオー
トクレーブを用い、定温保持時間を１２時間とした。処
理後に、遊離ＣａＯの分析、水浸膨張試験後の膨張率を
測定し、転炉スラグの改質後の評価を行った。この結果
を表２に示す。As can be seen from Table 1, this slag has an amount of free CaO of 9.5 wt% and a basicity (CaO / SiO 2).
2 ) is a converter slag of 4.9. Table 2 on this slag
Various modification treatments were performed under the temperature, atmosphere, and pressure conditions shown in. An autoclave having a high corrosion resistance inside was used as a device for the reforming treatment, and the constant temperature holding time was 12 hours. After the treatment, free CaO was analyzed, the expansion coefficient after the water immersion expansion test was measured, and the evaluation after reforming the converter slag was performed. The results are shown in Table 2.
【００１９】[0019]
【表２】 [Table 2]
【００２０】表２から明らかなように、本実施例によれ
ば、比較例と比べて、改質処理後の遊離ＣａＯの分析値
は格段に低いレベルになっている。また、実施例による
改質処理後のスラグを、Ｘ線回折によって固定した結
果、遊離ＣａＯは、Ｃａ（ＯＨ）2 、ＣａＣＯ3 へ変化
して安定化しており、水浸試験後の膨張率も路盤材用鉄
鋼スラグの品質規格である１．５％以下になった。As is clear from Table 2, according to this example, the analysis value of free CaO after the reforming treatment is at a much lower level than in the comparative example. Further, as a result of fixing the slag after the modification treatment according to the example by X-ray diffraction, free CaO was changed to Ca (OH) 2 and CaCO 3 and stabilized, and the expansion coefficient after the water immersion test was also changed. The quality standard for steel slag for roadbed materials fell to 1.5% or less.
【００２１】従来、常温でのエージング処理では３か月
以上も必要とされ、温水や水蒸気処理でも５日以上必要
とされていたエージング処理期間が、本発明により極め
て短時間になる。According to the present invention, the aging treatment period, which has been conventionally required for aging treatment at room temperature as long as 3 months or more and for hot water or steam treatment as 5 days or more, is extremely short.
【００２２】[0022]
【発明の効果】以上説明したように、遊離ＣａＯを含む
転炉スラグ等の製鋼スラグに本発明の製鋼スラグの改質
方法を施すことにより、この製鋼スラグを従来のエージ
ング処理に比べて極めて短期間に安定化でき、路盤材に
適したスラグに改質することができる。As described above, by subjecting steelmaking slag such as converter slag containing free CaO to the steelmaking slag modification method of the present invention, this steelmaking slag can be used for a very short period of time as compared with the conventional aging treatment. It can be stabilized in the meantime and can be modified into slag suitable for roadbed materials.
フロントページの続き (72)発明者 野崎 努 千葉市中央区川崎町１番地 川崎製鉄株式 会社技術研究本部内 (72)発明者 天辰 正義 千葉市中央区川崎町１番地 川崎製鉄株式 会社第３別館内Front page continued (72) Inventor Tsutomu Nozaki 1 Kawasaki-cho, Chuo-ku, Chiba City Technical Research Division, Kawasaki Steel Co., Ltd.
Claims (2)
１．２ｋｇ／ｃｍ2以上１０ｋｇ／ｃｍ2 未満、かつ、
温度が８０℃以上１８０℃以下の水蒸気雰囲気中で加圧
・加熱処理し、改質することを特徴とする製鋼スラグの
改質方法。1. A steelmaking slag containing free CaO having a pressure of 1.2 kg / cm 2 or more and less than 10 kg / cm 2 and
A method for reforming steelmaking slag, which comprises subjecting to reforming by pressurizing and heating in a steam atmosphere having a temperature of 80 ° C. or higher and 180 ° C. or lower.
スとの混合雰囲気中で処理することを特徴とする請求項
１記載の製鋼スラグの改質方法。2. The method for reforming steelmaking slag according to claim 1, wherein the treatment is performed in a mixed atmosphere of steam and CO 2 gas instead of the steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP163393A JPH06206743A (en) | 1993-01-08 | 1993-01-08 | Modification of steel-making slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP163393A JPH06206743A (en) | 1993-01-08 | 1993-01-08 | Modification of steel-making slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06206743A true JPH06206743A (en) | 1994-07-26 |
Family
ID=11506937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP163393A Withdrawn JPH06206743A (en) | 1993-01-08 | 1993-01-08 | Modification of steel-making slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06206743A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735767A1 (en) * | 1995-06-23 | 1996-12-27 | Lorraine Laminage | Preparation of granulated steel process slag for use in hydraulic cements or road surfaces |
| EP0718251A3 (en) * | 1994-12-12 | 1997-10-15 | Sumitomo Metal Ind | A method of aging steel-making slag and an apparatus for use in such a method |
| JP2007106631A (en) * | 2005-10-13 | 2007-04-26 | Sumitomo Metal Ind Ltd | Method for aging steelmaking slag |
| JP2009030101A (en) * | 2007-07-26 | 2009-02-12 | Daido Steel Co Ltd | Slag-making material, method for producing slag-making material, method for treating reducing slag and steeelmaking method |
| JP2011105519A (en) * | 2009-11-12 | 2011-06-02 | Sanyo Special Steel Co Ltd | Rapid aging method for steel slag |
| JP2013040073A (en) * | 2011-08-16 | 2013-02-28 | Nippon Steel & Sumitomo Metal Corp | Method of treating steel slag |
| JP2013087011A (en) * | 2011-10-17 | 2013-05-13 | Nippon Steel & Sumitomo Metal Corp | Steel slag hydration hardened body, and method for manufacturing the same |
| WO2022264668A1 (en) * | 2021-06-18 | 2022-12-22 | Ｊｆｅスチール株式会社 | Method for carbonating cao-containing substance and method for producing carbonated substance |
-
1993
- 1993-01-08 JP JP163393A patent/JPH06206743A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718251A3 (en) * | 1994-12-12 | 1997-10-15 | Sumitomo Metal Ind | A method of aging steel-making slag and an apparatus for use in such a method |
| US5879430A (en) * | 1994-12-12 | 1999-03-09 | Sumitomo Metal Industries, Ltd. | Method and apparatus for aging steel-making slag |
| US6053010A (en) * | 1994-12-12 | 2000-04-25 | Sumitomo Metal Industries, Ltd. | Apparatus for aging steel-making slag |
| FR2735767A1 (en) * | 1995-06-23 | 1996-12-27 | Lorraine Laminage | Preparation of granulated steel process slag for use in hydraulic cements or road surfaces |
| JP2007106631A (en) * | 2005-10-13 | 2007-04-26 | Sumitomo Metal Ind Ltd | Method for aging steelmaking slag |
| JP2009030101A (en) * | 2007-07-26 | 2009-02-12 | Daido Steel Co Ltd | Slag-making material, method for producing slag-making material, method for treating reducing slag and steeelmaking method |
| JP2011105519A (en) * | 2009-11-12 | 2011-06-02 | Sanyo Special Steel Co Ltd | Rapid aging method for steel slag |
| JP2013040073A (en) * | 2011-08-16 | 2013-02-28 | Nippon Steel & Sumitomo Metal Corp | Method of treating steel slag |
| JP2013087011A (en) * | 2011-10-17 | 2013-05-13 | Nippon Steel & Sumitomo Metal Corp | Steel slag hydration hardened body, and method for manufacturing the same |
| WO2022264668A1 (en) * | 2021-06-18 | 2022-12-22 | Ｊｆｅスチール株式会社 | Method for carbonating cao-containing substance and method for producing carbonated substance |
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