JP4267488B2 - Method for cooling steel slag - Google Patents
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- JP4267488B2 JP4267488B2 JP2004069153A JP2004069153A JP4267488B2 JP 4267488 B2 JP4267488 B2 JP 4267488B2 JP 2004069153 A JP2004069153 A JP 2004069153A JP 2004069153 A JP2004069153 A JP 2004069153A JP 4267488 B2 JP4267488 B2 JP 4267488B2
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- 239000002893 slag Substances 0.000 title claims description 132
- 238000001816 cooling Methods 0.000 title claims description 46
- 238000000034 method Methods 0.000 title claims description 21
- 229910000831 Steel Inorganic materials 0.000 title claims description 18
- 239000010959 steel Substances 0.000 title claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 36
- 235000012255 calcium oxide Nutrition 0.000 description 18
- 239000000292 calcium oxide Substances 0.000 description 18
- 239000000498 cooling water Substances 0.000 description 14
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 230000035515 penetration Effects 0.000 description 9
- 238000009628 steelmaking Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 101150006573 PAN1 gene Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
- C21B2400/072—Tanks to collect the slag, e.g. water tank
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacture Of Iron (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Details (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
本発明は製銑・製鋼工程で発生するＣａＯ分を含む製鉄スラグを冷却処理する方法に関するものである。 The present invention relates to a method for cooling iron-making slag containing CaO generated in the iron making and steel making processes.
近年の粗鋼生産量の増大とともに製銑工程・製鋼工程で発生する製鉄スラグ量も増加の一途をたどっている。しかしスラグ鍋等に受けた直後の製鉄スラグは高温であるため、未冷却のまま反転した場合は大量の粉塵飛散や火炎の発生、また、溶銑脱硫スラグや高炉スラグにおいては含有するグラファイトが飛散するため、環境問題等を引き起こす。このため製鉄スラグ反転の場合には建屋内や集塵機下で反転を行う等の対策が必要であるが、スラグに散水または注水を行うことで冷却し、粉塵の発生しない適度な含水状態にした後に反転する方法も用いられる。特にグラファイトを多く含有する溶銑脱硫スラグでは、比較的簡単な設備で大量のスラグを処理できることもあり、各製鉄所等で一般に用いられている。 With the recent increase in crude steel production, the amount of ironmaking slag generated in the ironmaking and steelmaking processes is steadily increasing. However, since the steelmaking slag immediately after receiving it in the slag pan etc. is high temperature, if it is inverted without being cooled, a large amount of dust scattering and flames are generated, and the contained graphite is scattered in hot metal desulfurization slag and blast furnace slag. This causes environmental problems. For this reason, in case of steel slag reversal, it is necessary to take measures such as reversing in the building or under the dust collector, but after cooling by sprinkling or pouring water into the slag and making it into an appropriate water content state where dust does not occur An inversion method is also used. In particular, hot metal desulfurization slag containing a large amount of graphite can be used to process a large amount of slag with relatively simple equipment, and is generally used in steelworks and the like.
これら製鉄スラグを散水または注水により円滑に処理するための手段として、散水または注水方法を工夫し、スラグの発塵をおさえ、かつ不必要な散水を押さえる方法が従来より提示されている。たとえば特許文献１では、スラグ鍋に受けた溶銑脱硫スラグに大量の散水を行い、上面が水張り状態になるまで冷却する１次冷却段階と、この後蒸発量に見合う散水量にてスラグ鍋の鉄皮温度が１００〜５０℃になるか、あるいは鍋に受けたスラグ量の１／２相当の容積の注水量で冷却する２次冷却工程の２段階を有する方案が提示されている。 As means for smoothly treating these steel slags by water spraying or water injection, a method of devising water spraying or water injection, suppressing dust generation of slag, and suppressing unnecessary water spraying has been proposed. For example, in Patent Document 1, a large amount of water is sprinkled on the hot metal desulfurization slag received in the slag pan, and cooling is performed until the upper surface is filled with water. There is proposed a method having two stages of a secondary cooling process in which the skin temperature is 100 to 50 ° C. or cooling is performed with a water injection amount corresponding to ½ of the slag amount received in the pan.
しかしながら、特許文献１に示される方法は、スラグの性状が一様な場合であれば問題なく適用できるが、実際は地金塊・スラグ塊等も含む不均一な性状であり、特にスラグ中にＣａＯ分が含まれている場合には水和膨張し、スラグ塊／粒間の隙間がなくなることで、水の浸透性が悪化するため、計算上の蒸発熱量以上の冷却水が必要になる場合が多い。従って、ＣａＯ分が含まれている場合には、冷却時間は必ずしも一定とはならず、操業計画が立てにくかったり、冷却時間のばらつきを見越して散水冷却設備を過大な基数設置しなくてはならない等、大きな生産・設備負荷が生じてしまうという課題があった。 However, the method disclosed in Patent Document 1 can be applied without any problem as long as the slag properties are uniform. However, the method is actually a non-uniform property including a bullion block, a slag block, and the like. In the case where slag is contained, it hydrates and expands, and there is no gap between slag lumps / grains, so water permeability deteriorates. . Therefore, when CaO content is included, the cooling time is not always constant, and it is difficult to make an operation plan, or an excessive number of sprinkling cooling facilities must be installed in anticipation of variations in the cooling time. There was a problem that a large production / equipment load would occur.
本発明が解決しようとする課題は、ＣａＯ分を含む製鉄スラグの冷却処理において、処理時間が短く、かつ冷却時間のばらつきの少ない安定した処理を可能とすると同時に、設備過剰投資と処理コスト・負荷を軽減した効率のよいスラグ処理方案を提供することである。 The problem to be solved by the present invention is that, in the cooling process of iron slag containing CaO, it is possible to perform a stable process with a short process time and a small variation in the cooling time, and at the same time, an excessive investment in equipment and a process cost / load. It is to provide an efficient slag treatment method that reduces the above.
本発明の要旨は以下の通りである。
ＣａＯ分を含む製鉄スラグをスラグ鍋に排滓後冷却する方法において、前記冷却方法がスラグ鍋上端付近まで注水する第１段階と、スラグ鍋の上部の少なくとも水浸透部分のスラグを排出する第２段階と、再度スラグ鍋上方からスラグ鍋の鉄皮表面温度が１００℃以下になるまで注水を行う第３段階とからなることを特徴とする製鉄スラグ冷却方法である。
The gist of the present invention is as follows.
In the method of cooling steelmaking slag containing CaO after being discharged into a slag pan, the cooling method injects water to the vicinity of the upper end of the slag pan, and a second step of discharging slag of at least the water permeation portion above the slag pan. It is a method for cooling iron slag characterized by comprising a stage and a third stage in which water is poured again from above the slag pot until the iron skin surface temperature of the slag pot becomes 100 ° C. or less.
本発明の製鉄スラグの冷却方法は、短くかつ安定した冷却時間で製鉄スラグを冷却することが可能であり、設備過剰投資と処理コスト・負荷を軽減し効率よい製鉄スラグ処理を可能とすることができる。 The method for cooling a steel slag of the present invention can cool the steel slag in a short and stable cooling time, and can reduce the facility over-investment and the processing cost / load, thereby enabling an efficient steel slag treatment. it can.
本発明者らは、水冷中にはスラグ中のＣａＯ分が水和膨張し、スラグ塊・粒同士の間の隙間がなくなることで、水の浸透性が悪化することから、この水和膨張する部分を除去し、水冷速度を再度上げることを考えた。 The present inventors hydrate and expand the CaO content in the slag during water cooling, and the water permeability deteriorates due to the absence of gaps between the slag lump / grains. We considered removing the part and increasing the water cooling rate again.
製銑・製鋼工程で用いられるＣａＯ分としては生石灰・石灰石等が代表的であるが、ＣａＯの融点は約２４００℃と溶銑温度・溶鋼温度と比較して高温であるため、かなりのＣａＯ分が未溶解のままスラグ中に残留してしまう。そのため、ＣａＯ分を含む製鉄スラグを冷却する際には、水と反応し以下（１）式のような水和反応が起こる。
ＣａＯ＋Ｈ2Ｏ → Ｃａ（ＯＨ）2 （１）
ＣａＯ分は、（１）式の水和反応により体積が約１．９５倍に膨張する。従ってスラグ鍋に排滓した製鉄スラグを上方から散水冷却した場合には、当初、空隙率４０％程度あった製鉄スラグが、前記ＣａＯの水和反応によってスラグの粒子間の空間（隙間）が無くなり、特に水が浸透したスラグ鍋上部のスラグほど空隙率が減少してしまう。この結果、スラグ鍋下部の製鉄スラグほど水の浸透が遅れ、冷却時間が長くなってしまう。
そこで本発明者らは、スラグ鍋の上部の既に水が浸透した製鉄スラグを冷却途中で除去することで、下部のスラグへの水の浸透速度を向上させ、水冷速度を促進させることを考えた。
Typical examples of the CaO component used in the steelmaking and steelmaking processes include quick lime and limestone. However, the melting point of CaO is about 2400 ° C, which is higher than the hot metal temperature and the molten steel temperature. It remains in the slag as undissolved. For this reason, when cooling the iron slag containing CaO, it reacts with water to cause a hydration reaction as shown in the following formula (1).
CaO + H 2 O → Ca (OH) 2 (1)
The volume of the CaO component expands about 1.95 times by the hydration reaction of the formula (1). Therefore, when the steel slag discharged to the slag pan is sprinkled and cooled from above, the iron slag having a porosity of about 40% initially has no space (gap) between the slag particles due to the CaO hydration reaction. In particular, the porosity of the slag at the top of the slag pan in which water has permeated decreases. As a result, the steel slag at the lower part of the slag pan has a slower water penetration and a longer cooling time.
Therefore, the present inventors considered to improve the penetration rate of water into the lower slag and promote the water cooling rate by removing the steel slag that has already penetrated water at the upper part of the slag pan during cooling. .
また、同じ高さのスラグ鍋において、スラグの性状（粒子径・空隙率）が同じであれば、下記（２）式に示すように、鍋内スラグと水面との距離すなわち水が浸透したスラグを含む有効冷却水高さ（ヘッド）ｈが大きく、逆にスラグ層高さＬ（水が浸透していない部分の高さ）が小さいほど、スラグへの水の浸透速度ｕは上昇すると考える。
ｕ ∝ ｈ ／ Ｌ （２）
従って、水が浸透したスラグ鍋上部の製鉄スラグを除去すれば、その分だけスラグ鍋上部の空間が増加し、スラグ鍋内の有効冷却水高さ（ヘッド）が増加するため、スラグ鍋下部の製鉄スラグに浸透せしめる水圧も上昇させることも可能になると考える。
以上の２つの相乗効果によって、単にＣａＯ分が膨張していないスラグ層を表面に出すのみではなく、水の浸透速度を上げることで冷却時間を短縮させることを知見したのである。
In addition, if the slag properties (particle diameter / void ratio) are the same in the same slag pan, the distance between the slag in the pan and the water surface, that is, the slag in which water penetrates, as shown in the following formula (2) It is considered that the permeation speed u of water into the slag increases as the effective cooling water height (head) h including is larger and conversely the slag layer height L (height of the portion where water does not permeate) is smaller.
u ∝ h / L (2)
Therefore, if the steel slag at the top of the slag pan that has penetrated the water is removed, the space above the slag pan increases and the effective cooling water height (head) in the slag pan increases. I think it will be possible to increase the water pressure that penetrates steel slag.
Through the above two synergistic effects, the inventors have found out that not only the slag layer in which the CaO content is not expanded is merely put on the surface but also the cooling time is shortened by increasing the water penetration rate.
以下に具体的な冷却方法について説明する。図１は、本発明によるスラグの冷却過程の一例を示したものである。スラグ鍋１に受けた製鉄スラグ２は、第１段階で鍋上方より注水または散水３され、冷却が開始される。（２）式より、冷却水がスラグ鍋内に張られて行き、有効冷却水高さｈが大きくなるほど冷却水浸透速度ｕは上昇する。しかし冷却水がスラグ鍋口高さＨに到達、すなわちＨ＝ｈ＋Ｌの場合、これ以上冷却水浸透速度ｕを上げることができなくなる。
さらに、前記水和反応によってスラグ鍋上部のスラグのＣａＯ分が膨張する為、スラグへの水の浸透時の抵抗が増大し、スラグ鍋下部スラグには水が浸透し難くなり、ついには鍋口から冷却水が流出４しはじめる。なお既に水の浸透したスラグ層は、これ以上冷却水を加えるとヘドロ状になってしまい、後のスラグ処理の際の作業・環境負荷も増加する。よって、この冷却水流出時点を第１段階から第２段階へ移行するタイミングとする。
次に第２段階で少なくともスラグに水が浸透している部分５について、ショベルカー等６を用いて鍋外に除去する。水の浸透部分か否かはスラグ表面温度を測定しながら判断することが確実であるが、簡易的にスラグを徐々に排出しながら目視でスラグ表面に赤熱部分が露出し始めたタイミングで水浸透部分の除去が完了、即ちスラグ未冷却（未浸透）部分が露出したと判断しても構わない。本来なら水冷部分以上を可能な限り除去し、スラグ厚みを薄くすることが望ましいが、赤熱したスラグ未冷却部に上方に残っている冷却水がかかれば、突然の水との接触により一気に水蒸気爆発が発生する恐れがある。そこで、実際はスラグ表面に赤熱部分が認められないことを確認しつつ、水未浸透部分のみを除去することが安全上望ましい。
この後、再度注水３による冷却する第３段階に移行する。ただし、水位が増えてスラグ厚みが薄くなったため、今度は第１段階のスラグの冷却より水の浸透速度が向上している。次に非接触式放射温度計７ないしは接触温度計あるいは熱電対にてスラグ鍋表面温度（鉄皮表面温度）を測定しながら注水し、この温度が１００℃以下まで低下しているか否かを確認し、鉄皮温度が１００℃以下に低下していれば散水を停止する。但し、鉄皮温度低下に必要以上に時間を要する場合（例えば第３段階の注水開始後、２０時間経過後も鉄皮温度１００℃に達しない場合）には、注水を停止して再度第２段階に戻り、水浸透したスラグ部分の除去と再冷却を繰り返すことをも作業効率を考える上で好ましい方法である。
A specific cooling method will be described below. FIG. 1 shows an example of a slag cooling process according to the present invention. The steel slag 2 received in the slag pan 1 is poured or sprinkled 3 from above the pan in the first stage, and cooling is started. From the equation (2), the cooling water is stretched in the slag pan, and the cooling water penetration rate u increases as the effective cooling water height h increases. However, when the cooling water reaches the slag pan opening height H, that is, H = h + L, the cooling water penetration rate u cannot be increased any more.
Furthermore, since the CaO content of the slag at the top of the slag pan expands due to the hydration reaction, the resistance when water penetrates into the slag increases, making it difficult for water to penetrate into the slag at the bottom of the slag pan. Cooling water starts to flow out of 4. In addition, the slag layer in which water has already permeated becomes sludge when cooling water is further added, and the work / environmental load during the subsequent slag treatment increases. Therefore, this cooling water outflow time is set as the timing for shifting from the first stage to the second stage.
Next, in the second stage, at least the
Thereafter, the process shifts to the third stage of cooling with the water injection 3 again. However, since the water level has increased and the slag thickness has become thinner, the water penetration rate is now improved over the first stage slag cooling. Next, water is poured while measuring the surface temperature of the slag pan (iron surface temperature) with a non-contact type radiation thermometer 7 or contact thermometer or thermocouple, and it is confirmed whether this temperature has dropped to 100 ° C or less. Then, if the iron skin temperature is lowered to 100 ° C. or less, watering is stopped. However, when it takes more time than necessary to lower the iron skin temperature (for example, when the iron skin temperature does not reach 100 ° C. even after 20 hours have passed since the start of the third stage of water injection), the water injection is stopped and the second is again performed. Returning to the stage and repeating the removal and recooling of the slag portion that has permeated the water is also a preferable method in view of work efficiency.
前記のように第３段階のスラグ鍋鉄皮温度が１００℃以下となった時点でスラグ鍋の下部スラグも全て水が浸透し冷却が完了したものと判断し、スラグへの注水を停止する。スラグ鍋鉄皮と冷却時間の関係を表した図２に示すように、スラグ鍋鉄皮温度は１００℃付近で温度降下の速度は非常に遅くなる。この１００℃となる時点は、水が製鉄スラグ全体へ浸透した時とほぼ一致しており、図２中に示すように、実際にその時点で冷却を中止しスラグ鍋を反転して調査したスラグの冷却完了状態（含水したスラグの割合）の推移とも一致していた。従って、１００℃以下になった場合を冷却完了とすれば、スラグ鍋の下部スラグも全て水が浸透し冷却が完了したものと見なすことができるのである。
なお第２段階のスラグ除去については、ショベルカー等を用いて掬い出したり、天井クレーンを使う、あるいはスラグ鍋をスラグダンプカー８で背負い徐々に傾斜させて水冷部分のみ排出する等の方案が考えられるが、許される処理時間・可能な冷却設備基数、処理専用地の広さ等、処理設備の条件により適宜選択すればよい。
As described above, when the third stage slag pan core temperature becomes 100 ° C. or less, it is determined that all the lower slag of the slag pan has penetrated and cooling is completed, and water injection into the slag is stopped. As shown in FIG. 2 showing the relationship between the slag pot core and the cooling time, the temperature drop rate is very slow when the slag pot core temperature is around 100 ° C. The point of time when the temperature reaches 100 ° C. is almost the same as when the water has permeated the entire steel slag. As shown in FIG. 2, the slag was investigated by actually stopping the cooling at that point and inverting the slag pan. It was also consistent with the transition of the cooling completion state (ratio of slag containing water). Therefore, if cooling is completed when the temperature is 100 ° C. or lower, it can be considered that all the lower slag of the slag pan has permeated water and has been cooled.
As for the second stage of slag removal, it is conceivable to use a shovel car or the like, use an overhead crane, or gradually tilt the slag pot with the slag dump truck 8 and discharge only the water-cooled part. However, what is necessary is just to select suitably according to the conditions of processing equipment, such as allowable processing time, the number of possible cooling equipment, the width of a processing exclusive land.
本発明の実施例を説明する。まず各製鉄スラグの成分は、以下の通りである。
１． 溶銑脱Ｓ滓
３５０ｔ溶銑鍋において、浸漬ランスによるインジェクションにより生石灰８５％−Ｍｇ１５％の脱硫剤を添加した際の処理後スラグである。
主要成分 ＣａＯ： ２０〜２５％
Ｔ．Ｆｅ： ４０〜５０％（うちＭ．Ｆｅ：３５〜４５％）
ＳｉＯ2： ４〜５％、Ａｌ2Ｏ3：≦１％
Ｓ： １〜２％、グラファイト：３〜５％
２． 高炉滓
主要成分 ＣａＯ： ３０〜４０％、ＳｉＯ2： ３０〜４０％
Ａｌ2Ｏ3：１０〜２０％、Ｓ： ０．５〜１％
Ｔ．Ｆｅ：≦１％、グラファイト： １〜３％
３．転炉滓
主要成分 ＣａＯ： ４５〜５０％、ＳｉＯ2： １０〜１５％
Ａｌ2Ｏ3： １〜２％、Ｓ： ０．０１〜０．０２％
Ｔ．Ｆｅ：１５〜２０％（うちＭ．Ｆｅ≦５％）
Ｐ2Ｏ5： ２．５〜３．５％
グラファイト ≒ ０％
なお、本発明例は何れも水冷途中でスラグの水浸透部分を除去後、再度鉄皮表面温度が１００℃以下まで水冷した例である。また比較例１〜４はスラグ鍋上部から鉄皮表面温度が１００℃以下まで注水のみを行った場合、もしくはスラグ量の１／２相当の容量で注水した場合の比較例である。
Examples of the present invention will be described. First, the components of each iron slag are as follows.
1. Hot metal desulfurization S slag is a slag after treatment when a desulfurization agent of quick lime 85% -
Main ingredients CaO: 20-25%
T.A. Fe: 40 to 50% (including M.Fe: 35 to 45%)
SiO 2 : 4 to 5%, Al 2 O 3 : ≦ 1%
S: 1-2%, graphite: 3-5%
2. Blast furnace slag
Al 2 O 3 : 10 to 20%, S: 0.5 to 1%
T.A. Fe: ≦ 1%, Graphite: 1-3%
3. BOF slag
Al 2 O 3: 1~2%, S: 0.01~0.02%
T.A. Fe: 15-20% (including M.Fe ≦ 5%)
P 2 O 5 : 2.5 to 3.5%
Graphite ≒ 0%
In addition, all of the examples of the present invention are examples in which the water penetration portion of the slag was removed during the water cooling, and then the steel surface temperature was again cooled to 100 ° C. or less. Further, Comparative Examples 1 to 4 are comparative examples in the case where only water is poured from the upper part of the slag pan to the iron skin surface temperature of 100 ° C. or less, or when water is poured in a volume equivalent to ½ of the amount of slag.
一方、表面が水張りするまで大量散水を行い、その後は本発明例のように途中でスラグ排出を行わずに水冷を続けた比較例１〜４は、いずれも冷却完了まで３０時間以上を要してしまった。特に途中２回スラグ除去をおこなった本発明例５とスラグパンの大きさが同じで、かつスラグ量がほぼ同じであった比較例２は、大幅に冷却時間が延長されていた。
On the other hand, all of Comparative Examples 1 to 4 in which a large amount of water was sprayed until the surface was filled with water, and thereafter water cooling was continued without discharging slag on the way as in the present invention example, it took 30 hours or more to complete the cooling. I have. Particularly, the cooling time was significantly extended in Comparative Example 2 in which the size of the slag pan was the same and the amount of slag was almost the same as Example 5 of the present invention in which slag was removed twice in the middle.
１…溶銑鍋
２…製鉄スラグ
３…注水または散水（冷却水）
４…オーバーフローした冷却水
５…スラグ水冷部分
６…ショベルカー
７…非接触式放射温度計
８…スラグダンプカー
９…溶銑鍋
１０…溶銑ないしは溶鋼
１１…スラグ除滓機（ドラッガー）
Ｈ…スラグ鍋口高さ
Ｌ…スラグ層高さ
ｈ…有効冷却水高さ（ヘッド）
DESCRIPTION OF SYMBOLS 1 ... Hot metal ladle 2 ... Steelmaking slag 3 ... Water injection or sprinkling (cooling water)
4 ... Overflowing cooling
H ... Slag pan mouth height L ... Slag layer height h ... Effective cooling water height (head)
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| CN102304593A (en) * | 2011-09-14 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Water cooling method for molten iron pretreatment slag |
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| CN102304593A (en) * | 2011-09-14 | 2012-01-04 | 山西太钢不锈钢股份有限公司 | Water cooling method for molten iron pretreatment slag |
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| CN103276123B (en) * | 2013-06-07 | 2016-03-16 | 山西太钢不锈钢股份有限公司 | A kind of method of cooling of stainless steel slag |
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