JPH06184610A - Treatment of cooling steelmaking slag - Google Patents
Treatment of cooling steelmaking slagInfo
- Publication number
- JPH06184610A JPH06184610A JP43A JP34196892A JPH06184610A JP H06184610 A JPH06184610 A JP H06184610A JP 43 A JP43 A JP 43A JP 34196892 A JP34196892 A JP 34196892A JP H06184610 A JPH06184610 A JP H06184610A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- cooling
- water
- closed container
- steelmaking slag
- 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- Withdrawn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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、製鋼スラグの冷却方
法に関するものである。製鋼スラグを水で冷却すると、
スラグ中のＣａＯ分が水蒸気等と反応して体積膨張（Ｃ
ａ（ＯＨ）2の生成）する現象、および製鋼スラグとＣ
Ｏ2 ガスを反応させると体積膨張（ＣａＣＯ3 ）する現
象を利用して、冷却中にスラグの自己破砕を促進し、現
状稼働している破砕工程を省略すると共にエージング期
間（時効劣化を無くすための時間であり、現状１年以上
かかっている。）を短縮する方法を提供するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling steelmaking slag. When the steelmaking slag is cooled with water,
The CaO content in the slag reacts with water vapor etc. and causes volume expansion (C
a (OH) 2 formation), steelmaking slag and C
Utilizing the phenomenon of volume expansion (CaCO 3 ) when O 2 gas reacts, it promotes the self-crushing of slag during cooling, omits the current crushing process, and ages (to eliminate aging deterioration. It takes more than a year now).
【０００２】[0002]
【従来の技術】従来の製鋼スラグの冷却処理において
は、製鋼精錬が終わり精錬炉から排出されたスラグを先
ず土場あるいは鉄板上に放流して熱を放散し、固める方
法が取られていた。また、このスラグは冷却完了後に破
砕機にて必要粒度まで破砕し、破砕されたスラグは磁選
機を通し鉄分を回収した後、路盤材、埋め立て等に利用
されていた。2. Description of the Related Art In the conventional cooling treatment of steelmaking slag, a method has been adopted in which the slag discharged from the smelting furnace after steelmaking refining is first discharged onto a soil field or an iron plate to dissipate heat and solidify. Further, this slag was crushed to a required particle size by a crusher after completion of cooling, and the crushed slag was used for roadbed materials, landfill, etc. after recovering iron content through a magnetic separator.
【０００３】ところが、上記したスラグ処理方法は、粉
塵が飛散し環境的に劣悪である上に、特に冷却工程では
高熱下での作業も余儀無くされ、その作業は典型的な３
Ｋ作業で過酷なものとなっている。また、処理時間が長
く工程が多岐にわたるため、運転費、人件費等、処理コ
ストが高くなり、敷地も膨大な面積が必要とされる。そ
の上、処理後のスラグは、水和反応による膨張性を低下
させる目的で１〜３年程度ヤードに放置しエージングし
て安定化させる必要がある。However, the above-mentioned slag processing method is environmentally inferior due to dust scattering, and in addition, the work under high heat is inevitable especially in the cooling process, and the work is typical 3
K work has become harsh. Further, since the processing time is long and the processes are diverse, the processing cost such as operating cost, personnel cost, etc. is high, and a huge site is required. In addition, the treated slag needs to be left in the yard for about 1 to 3 years to be aged and stabilized for the purpose of reducing the expansivity due to the hydration reaction.
【０００４】そこで過去に水和反応を促進する目的で、
密閉容器内で高温スラグに散水し、スラグを処理する方
法が特開昭５５−１０７０３号公報で紹介されている。
これは、密閉容器に装入した高温スラグに散水し、発生
水蒸気にて水和反応を促進してスラグを安定化（エージ
ング期間短縮目的）させる方法である。Therefore, in order to accelerate the hydration reaction in the past,
Japanese Patent Laid-Open No. 55-10703 discloses a method of treating high temperature slag by sprinkling water on it in a closed container.
This is a method in which high temperature slag charged in a closed container is sprinkled with water, and the generated steam promotes a hydration reaction to stabilize the slag (to shorten the aging period).
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記発明で
は、長時間の水和反応処理を行なっても充分に水和反応
が進まず、水和反応による自己破砕が出来る迄には到っ
ていなかった。したがって、この発明によっても、上記
した作業性、処理コスト、環境問題等の多くの問題を抱
えたままであった。However, in the above invention, the hydration reaction does not proceed sufficiently even if the hydration reaction treatment is carried out for a long time, and self-crushing by the hydration reaction has not been achieved. It was Therefore, according to the present invention as well, many problems such as the workability, the processing cost, and the environmental problem described above are still held.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記課題を解
決するため、その要旨は製鋼精錬炉から排出されて凝固
した高温のスラグを密閉容器内に充填し、この充填スラ
グ層の上方から散水し冷却する製鋼スラグの冷却方法に
おいて、スラグ充填後の前記密閉容器内圧力を４５０To
rr以下に減圧したあと、該密閉容器内のスラグ充填層に
上方から散水すると同時に該密閉容器内にＣＯ2 ガスを
導入し、該密閉容器内のＣＯ2 分圧を０．２〜０．８に
調整することを特徴とする。さらに密閉容器内において
大気圧より過剰となった水蒸気−ＣＯ2 混合ガスを容器
外に排出させ、散水はスラグ温度が２００℃以下になる
まで行う製鋼スラグの処理方法である。In order to solve the above-mentioned problems, the gist of the present invention is to fill a closed container with high-temperature slag discharged from a steel-refining furnace and solidified, and from above the filled slag layer. In the method for cooling a steelmaking slag which is sprinkled with water and cooled, the pressure inside the closed container after filling the slag is set to 450 To.
After reducing the pressure to rr or less, water is sprinkled from above into the slag-filled layer in the closed container, and at the same time, CO 2 gas is introduced into the closed container so that the CO 2 partial pressure in the closed container is 0.2 to 0.8. It is characterized by adjusting to. Further, the steam-CO 2 mixed gas, which is in excess of atmospheric pressure in the closed container, is discharged to the outside of the container, and water sprinkling is performed until the slag temperature becomes 200 ° C. or lower.
【０００７】[0007]
【作用】本発明者らは、スラグの膨張が（１）に示すス
ラグ中フリーＣａＯの水和反応および（２）式に示す炭
酸化反応により生じていることを見出した。 ＣａＯ ＋ Ｈ2 Ｏ ＝ Ｃａ（ＯＨ）2 ─────────（１） ＣａＯ ＋ ＣＯ2 ＝ ＣａＣＯ3 ─────────（２） （１）および（２）式の反応とスラグの崩壊（自己破
砕）との関係について種々検討した結果、スラグの崩壊
はスラグ内に存在する数１００ミクロンから数mmサイズ
の未滓化ＣａＯ相が（１）および（２）式の反応を起こ
して体積膨張（Ｃａ（ＯＨ）2 およびＣａＣＯ3 の生成
による）することにより起こることを突き止めた。すな
わち、未滓化ＣａＯ相はＣａＯ濃度が８０％以上もある
ためこの部分から優先的に（１）および（２）式の反応
を起こして、未滓化ＣａＯ相の局部的膨張がスラグの崩
壊を招いていることを明らかにした。そこで、本発明者
らは、さらにこの未滓化ＣａＯ相の膨張現象の律速段階
を明らかにするための各種実験を実施し、崩壊におよぼ
す諸要因の影響を検討した結果、反応生成物であるＣａ
（ＯＨ）2 およびＣａＣＯ3 中の亀裂、気孔を通した水
蒸気−ＣＯ2 混合ガスの浸透速度が反応を律速している
ことが判明した。すなわち、（１）および（２）式の反
応を促進するには未滓化ＣａＯ相と水蒸気−ＣＯ2 混合
ガスとの接触を促進する必要がある。そのためには、ス
ラグ中の亀裂或いは気孔中の空気等のガスを事前に除去
し、そこに水蒸気−ＣＯ2 混合ガスを引き込むことが極
めて有効である。The present inventors have found that the expansion of slag is caused by the hydration reaction of free CaO in slag shown in (1) and the carbonation reaction shown in equation (2). CaO + H 2 O = Ca (OH) 2 ────────── (1) CaO + CO 2 = CaCO 3 ───────── (2) Formulas (1) and (2) As a result of various studies on the relationship between the reaction of slag and the collapse (self-crushing) of slag, the collapse of slag was found to be due to the unslagged CaO phase of several hundred microns to several mm size present in the slag (1) and (2). It was found that the reaction was caused by the volume expansion (due to the formation of Ca (OH) 2 and CaCO 3 ). That is, since the CaO concentration in the undesolated CaO phase is 80% or more, the reaction of the equations (1) and (2) is preferentially initiated from this portion, and the local expansion of the undesolated CaO phase causes the slag to collapse. It was revealed that he was invited. Therefore, the present inventors further conducted various experiments for clarifying the rate-determining step of the expansion phenomenon of the unsmelted CaO phase, and examined the influence of various factors on the collapse, and as a result, it was a reaction product. Ca
It was found that the rate of permeation of the steam-CO 2 mixed gas through the cracks and pores in (OH) 2 and CaCO 3 limited the reaction. That is, in order to promote the reactions of the formulas (1) and (2), it is necessary to promote the contact between the undeliquesed CaO phase and the steam-CO 2 mixed gas. For that purpose, it is extremely effective to remove gas such as cracks in the slag or air in the pores in advance and draw in the steam-CO 2 mixed gas.
【０００８】そこで、本発明者らは事前処理として必要
な圧力（減圧）と水蒸気−ＣＯ2 混合ガスの適正な配合
比率を明らかにするための各種の実験を行なった。その
結果、図１および図２に示す結果が得られた。すなわ
ち、図１に示すように、水蒸気−ＣＯ2 混合ガスのＣＯ
2 分圧を０．５（混合比１：１）として、冷却処理前の
真空度（減圧の程度）を種々変化させ、スラグの自己崩
壊におよぼす真空度の影響を見た結果、４５０Torr以下
にするとその後の冷却処理で自己崩壊が良好に進行する
ことを明らかにした。また、スラグ崩壊に及ぼす水蒸気
−ＣＯ2 混合ガスのＣＯ分圧の影響を見るため、容器内
圧力を３００Torrの一定条件のもとに、ＣＯ2 分圧を大
幅に変化させた実験を行った。その結果、図２に示すよ
うに、ＣＯ2 分圧を０．２〜０．８の範囲に調整すると
スラグの自己崩壊が大きく促進されることが判明した。
なお、図１および図２に併記しているように、エージン
グ期間に対しては、ＣａＯの水和反応或いは炭酸化反応
の進行期間そのものがエージング期間であるため、スラ
グ自己崩壊のための上記適正条件に対応してエージング
のための時間が短縮出来る。冷却に必要な散水量はスラ
グの凝固直後の約１０００℃のものを２００℃以下に冷
却するに必要な量を保証してさえいればその供給速度に
よらず崩壊は十分進む。ただし、実際問題としては、製
鋼精錬時間と対応したスラグ処理を行う必要があるの
で、３０分以内に２００℃以下に冷却出来るような散水
速度を設定するのが望ましい。この方法によれば、スラ
グの自己崩壊が促進できるばかりではなく、崩壊により
スラグ表面積が増大して冷却速度が大きくなり、更には
水和反応および炭酸化反応の促進に対応して処理後スラ
グの安定化（膨張率低下）のためのエージング期間も短
縮できる。Therefore, the present inventors conducted various experiments to clarify the pressure (reduced pressure) required for pretreatment and the proper mixing ratio of the steam-CO 2 mixed gas. As a result, the results shown in FIGS. 1 and 2 were obtained. That is, as shown in FIG. 1, CO of the steam-CO 2 mixed gas
With the partial pressure of 0.5 (mixing ratio 1: 1), the degree of vacuum (degree of pressure reduction) before cooling was varied, and the effect of the degree of vacuum on the self-destruction of the slag was examined. Then, it was clarified that the self-disintegration proceeded well in the subsequent cooling treatment. Further, in order to see the effect of the CO partial pressure of the steam-CO 2 mixed gas on the slag collapse, an experiment was performed in which the CO 2 partial pressure was changed significantly under the constant condition of the container internal pressure of 300 Torr. As a result, as shown in FIG. 2, it was found that adjusting the CO 2 partial pressure within the range of 0.2 to 0.8 greatly promotes the self-destruction of the slag.
As shown in FIGS. 1 and 2, since the aging period is the aging period of CaO hydration reaction or carbonation reaction, the above-mentioned optimum conditions for slag self-disintegration are obtained. The time for aging can be shortened according to the conditions. As long as the amount of sprinkling water required for cooling is about 1000 ° C. immediately after solidification of the slag, the amount required for cooling to 200 ° C. or less is guaranteed, and the disintegration proceeds sufficiently regardless of the supply rate. However, as a practical problem, since it is necessary to perform a slag treatment corresponding to the steel refining time, it is desirable to set the water spray rate so that the water can be cooled to 200 ° C or lower within 30 minutes. According to this method, not only the self-disintegration of the slag can be promoted, but also the slag surface area is increased by the disintegration to increase the cooling rate, and further, the slag of the treated slag can be treated corresponding to the promotion of the hydration reaction and the carbonation reaction. The aging period for stabilization (decrease in expansion coefficient) can also be shortened.
【０００９】[0009]
【実施例】温度８００℃〜９００℃、平均粒径が１００
mmおよび３００mm（最大粒径５００mm）の高温製鋼スラ
グ（組成；ＣａＯ＝４８％，ＳｉＯ2 ＝１２％，Ｔ．Ｆ
ｅ＝１３％，Ｐ2 Ｏ5 ＝３％，ＭｇＯ＝５％）を図３に
示す設備の下部に目皿１４を持つ鋼板容器１に、高さ１
ｍ充填し、密閉容器２の開閉部３を開けて装入する。開
閉部３を密閉し、真空ポンプ４で密閉容器２内のガスを
除去したあと、ポンプ５と流量調整弁６を用いて、給水
タンク７より注入ノズル８を通じて密閉容器２内へ水を
注入する。注入と同時に、冷却水は水蒸気となり、容器
内に充満する。その圧力を圧力計９で検知しながら１０
のラインからＣＯ2 ガスを容器内に注入し、ＣＯ2 濃度
をガス分析計１１により測定し、圧力の情報と合わせて
ＣＯ2分圧を０．２〜０．８になるよう流量調整弁１２
によりＣＯ2 流量を調整する。水蒸気が過剰になりＣＯ
2 分圧が適正範囲に調整出来ない場合は、開放弁１３か
ら蒸気を放散してＣＯ2 分圧を調整する。以上の処理を
表１の処理水準にて実施した。表２にその結果、すなわ
ち処理後のスラグの平均粒径と処理後の必要エージング
期間を示す。Example: Temperature: 800 ° C to 900 ° C, average particle size: 100
mm and 300 mm (maximum particle size 500 mm) high temperature steelmaking slag (composition; CaO = 48%, SiO 2 = 12%, TF
e = 13%, P 2 O 5 = 3%, MgO = 5%) in a steel plate container 1 having a plate 14 at the bottom of the equipment shown in FIG.
m, and the opening / closing part 3 of the closed container 2 is opened and charged. After closing the opening / closing part 3 and removing the gas in the closed container 2 with the vacuum pump 4, water is injected into the closed container 2 from the water supply tank 7 through the injection nozzle 8 using the pump 5 and the flow rate adjusting valve 6. . Simultaneously with the injection, the cooling water becomes steam and fills the container. While detecting the pressure with the pressure gauge 9, 10
The CO 2 gas is injected into the container from the line, the CO 2 concentration is measured by the gas analyzer 11, and the CO 2 partial pressure is adjusted to 0.2 to 0.8 in accordance with the pressure information.
Adjust the flow rate of CO 2 . Excess steam causes CO
When the partial pressure of 2 cannot be adjusted within the proper range, steam is diffused from the release valve 13 to adjust the partial pressure of CO 2 . The above processing was carried out at the processing levels shown in Table 1. Table 2 shows the results, that is, the average particle size of the slag after the treatment and the required aging period after the treatment.
【表１】 [Table 1]
【表２】 本表によれば、本発明の条件範囲内で処理したものは、
処理後スラグの平均粒径が１５mm以下迄（現行の磁選工
程前のスラグ破砕処理後の粒径に相当）の自己破壊を起
こした。また、処理後のエージング期間も、本発明例は
比較例より大きく短縮した。[Table 2] According to this table, those processed within the range of the conditions of the present invention are:
After the treatment, self-destruction occurred until the average particle size of the slag was 15 mm or less (corresponding to the particle size after the current slag crushing process before the magnetic separation process). Also, the aging period after the treatment was significantly shortened in the inventive examples as compared with the comparative examples.
【００１０】[0010]
【発明の効果】本発明によれば、高温の製鋼スラグを冷
却すると同時にスラグの水和反応および炭酸化反応によ
る膨張力に起因するスラグの自己崩壊を大幅に促進し、
従来使用されていた破砕工程が不要になるばかりでな
く、エージング期間の短縮、作業環境の改善、粉塵飛散
問題の解消につながり、本発明がこの種の産業分野にも
たらす効果は極めて大きい。According to the present invention, the high temperature steelmaking slag is cooled and, at the same time, the slag self-disintegration due to the expansion force due to the hydration reaction and the carbonation reaction of the slag is greatly promoted.
Not only does the conventional crushing process become unnecessary, but it also leads to shortening of the aging period, improvement of the working environment, and elimination of the dust scattering problem, and the present invention has an extremely great effect on this type of industrial field.
【図１】スラグの崩壊度およびエージング期間に及ぼす
冷却前の容器内圧力の影響を示す図である。FIG. 1 is a diagram showing an influence of a pressure in a container before cooling on a degree of slag collapse and an aging period.
【図２】スラグの崩壊度およびエージング期間に及ぼす
容器内のＣＯ2 −Ｈ2 Ｏ混合ガスのＣＯ2 分圧の影響を
示す図である。FIG. 2 is a diagram showing the influence of the CO 2 partial pressure of a CO 2 —H 2 O mixed gas in a container on the degree of slag collapse and the aging period.
【図３】処理設備および処理方法を示す図である。FIG. 3 is a diagram showing a processing facility and a processing method.
１…鋼板容器 ２…密閉容器 ３…開閉部 ４…真空ポンプ ５…ポンプ ６…流量調整弁 ７…給水タンク ８…注入ノズル ９…圧力計 １０…ＣＯ2 用配管 １１…ガス分析計 １２…流量調整弁 １３…開放弁 １４…目皿DESCRIPTION OF SYMBOLS 1 ... Steel plate container 2 ... Airtight container 3 ... Opening / closing part 4 ... Vacuum pump 5 ... Pump 6 ... Flow control valve 7 ... Water supply tank 8 ... Injection nozzle 9 ... Pressure gauge 10 ... CO 2 piping 11 ... Gas analyzer 12 ... Flow rate Regulator valve 13 ... Open valve 14 ... Drain
Claims (3)
のスラグを密閉容器内に充填し、この充填スラグ層の上
方から散水し冷却する製鋼スラグの冷却方法において、
スラグ充填後の前記密閉容器内圧力を４５０Torr以下に
減圧したあと、該密閉容器内のスラグ充填層に上方から
散水すると同時に該密閉容器内にＣＯ 2 ガスを導入し、
該密閉容器内のＣＯ2 分圧を０．２〜０．８に調整する
ことを特徴とする製鋼スラグの冷却処理方法。1. A high temperature solidified by being discharged from a steel refining furnace.
The slag of
In the cooling method of steelmaking slag that sprinkles water from one side and cools,
The pressure inside the closed container after slag filling is less than 450 Torr
After depressurizing the slag packed bed in the closed container from above
At the same time as sprinkling water, CO 2Introduce gas,
CO in the closed container2Adjust the partial pressure to 0.2-0.8
A method for cooling steelmaking slag, which is characterized in that
となった水蒸気−ＣＯ2 混合ガスを容器外に排出させる
請求項１記載の製鋼スラグの冷却処理方法。2. The method for cooling a steelmaking slag according to claim 1, wherein the steam-CO 2 mixed gas, which is in excess of atmospheric pressure in the closed container, is discharged to the outside of the container.
なるまで行う請求項１記載の製鋼スラグの冷却処理方
法。3. The cooling treatment method for steelmaking slag according to claim 1, wherein the water spraying is performed until the slag temperature becomes 200 ° C. or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP43A JPH06184610A (en) | 1992-12-22 | 1992-12-22 | Treatment of cooling steelmaking slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP43A JPH06184610A (en) | 1992-12-22 | 1992-12-22 | Treatment of cooling steelmaking slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06184610A true JPH06184610A (en) | 1994-07-05 |
Family
ID=18350162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP43A Withdrawn JPH06184610A (en) | 1992-12-22 | 1992-12-22 | Treatment of cooling steelmaking slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06184610A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009126747A (en) * | 2007-11-26 | 2009-06-11 | Nippon Steel Corp | Method for treating slug |
| KR101527454B1 (en) * | 2013-05-20 | 2015-06-11 | 재단법인 포항산업과학연구원 | Apparatus for forced aging of steelmaking slag |
| CN111763786A (en) * | 2020-08-04 | 2020-10-13 | 中冶节能环保有限责任公司 | High-temperature steel slag carbonization deep stabilization treatment device and method |
| CN115069362A (en) * | 2022-05-30 | 2022-09-20 | 湖北工业大学 | Carbon fixation and emission reduction method for steel plant wet-grinding steel slag and application |
-
1992
- 1992-12-22 JP JP43A patent/JPH06184610A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009126747A (en) * | 2007-11-26 | 2009-06-11 | Nippon Steel Corp | Method for treating slug |
| KR101527454B1 (en) * | 2013-05-20 | 2015-06-11 | 재단법인 포항산업과학연구원 | Apparatus for forced aging of steelmaking slag |
| CN111763786A (en) * | 2020-08-04 | 2020-10-13 | 中冶节能环保有限责任公司 | High-temperature steel slag carbonization deep stabilization treatment device and method |
| CN115069362A (en) * | 2022-05-30 | 2022-09-20 | 湖北工业大学 | Carbon fixation and emission reduction method for steel plant wet-grinding steel slag and application |
| CN115069362B (en) * | 2022-05-30 | 2023-11-21 | 湖北工业大学 | Method for carbon fixation and emission reduction of wet-milling steel slag in steel plant and application of method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000307 |