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JP2001233644A - Apparatus for producing water-granulated slag - Google Patents

Apparatus for producing water-granulated slag

Info

Publication number
JP2001233644A
JP2001233644A JP2000044534A JP2000044534A JP2001233644A JP 2001233644 A JP2001233644 A JP 2001233644A JP 2000044534 A JP2000044534 A JP 2000044534A JP 2000044534 A JP2000044534 A JP 2000044534A JP 2001233644 A JP2001233644 A JP 2001233644A
Authority
JP
Japan
Prior art keywords
slag
steam
molten slag
water
molten
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Withdrawn
Application number
JP2000044534A
Other languages
Japanese (ja)
Inventor
Kazuhiko Matsuyama
和彦 松山
Hiroyuki Chiba
洋之 千葉
Noriaki Oku
律明 奥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Nisshin Co Ltd
Original Assignee
Nisshin Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP2000044534A priority Critical patent/JP2001233644A/en
Publication of JP2001233644A publication Critical patent/JP2001233644A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/361Condition or time responsive control in hydraulic cement manufacturing processes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To impart high pulverizing characteristics to a slag by blowing steam to the molten slag before cooling the slag with a cooling water. SOLUTION: This apparatus for producing a water-granulated slag by cooling the molten slag (10) discharged from a blast furnace body (1) with the cooling water from water-jetting nozzles (4a) is constituted so that steam-jetting nozzles (5) may be arranged at the aslant upper direction of a blowing box (4), and the steam may be blown to the molten slag before the cooling by the cooling water.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、水砕スラグの製造
装置に関し、特に、高炉から排出された溶融スラグを高
圧水を用いて急冷・破砕して水砕スラグを製造する場合
に、水蒸気を吹き付けることにより高い粉砕特性を得る
ための新規な改良に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for producing granulated slag, and more particularly to a device for producing granulated slag by rapidly cooling and crushing molten slag discharged from a blast furnace using high-pressure water. The present invention relates to a novel improvement for obtaining high grinding characteristics by spraying.

【0002】[0002]

【従来の技術】最近、高炉スラグは、製鉄副産物として
全量が各種分野において有効利用されている。すなわ
ち、徐冷し結晶質の岩石状の塊となったものが高炉徐冷
スラグで、この塊を粉砕・製粒したスラグは、道路用の
路盤材やコンクリート用骨材、セメント用クリンカー材
として用いられる。一方、水砕スラグは溶融したスラグ
に多量の水を吹き付けて急冷・破砕することにより、製
造されガラス質の粒状で主にセメント原料として有効利
用される。具体的には例えば、図9に示すように、高炉
本体1から出銑樋2に排出される溶銑から、溶融スラグ
10を分離し、分離した溶融スラグ10を水砕吹製装置
である吹製函4から多量の冷却水を吹き付けることによ
り、急冷・破砕している。水砕スラグは、図10に示す
ようにガラス質を主とする実質部aに開気泡b及び閉気
泡cが分散した粒子構造をもち、ガラス化率の高いほど
高品質とされている。このガラス化率は溶融スラグの急
冷条件に影響されるため、溶融スラグの流量に応じ冷却
水の噴射水量を制御することにより急冷条件を一定化し
ている。近年、セメント原料に適した粉砕性の高い高品
質の水砕スラグのニーズが高まっている。水砕スラグを
前記セメント原料として使用するには、冷却時の溶融ス
ラグ温度、冷却水量、水圧、溶融スラグの発泡反応等の
条件を制御する方法が採られている。発泡反応を制御す
る方法としては、特開昭55−20273号には、溶融
高炉スラグに水蒸気を吹き込みH2・N2のガス成分を発
生させた結果、発泡反応が起こりにくくなり緻密化水砕
スラグを製造する方法が開示されている。また、特開平
1−239042号公報には、溶融スラグを冷却水中に
液滴し、溶融スラグが冷却・凝固される間に冷却水の気
化ガスと接触させてスラグを発泡させる方法が開示され
ている。さらに、特開昭55−28347号公報には、
軽量スラグの製造方法として、溶融スラグにガス状の窒
素富化化合物を添加して該スラグ中の結合窒素量を増加
させた後に、多量の高圧水を噴射させて発泡軽量化させ
た水砕スラグの製造方法が開示されている。
2. Description of the Related Art Recently, all blast furnace slag is effectively used in various fields as a by-product of iron making. That is, the blast furnace gradual cooling slag is a blast furnace slag that is gradually cooled and becomes a crystalline rock-like lump, and the slag obtained by pulverizing and granulating this lump is used as roadbed material for roads, aggregate for concrete, and clinker material for cement. Used. On the other hand, the granulated slag is produced by spraying a large amount of water onto the molten slag and rapidly cooling and crushing the slag, whereby the granulated slag is effectively used as a vitreous granular material mainly as a cement raw material. Specifically, for example, as shown in FIG. 9, the molten slag 10 is separated from the hot metal discharged from the blast furnace main body 1 to the tapping gutter 2 and the separated molten slag 10 is blown by a water granulation blowing device. Rapid cooling and crushing are performed by spraying a large amount of cooling water from the box 4. As shown in FIG. 10, the granulated slag has a particle structure in which open cells b and closed cells c are dispersed in a substantial part a mainly composed of glass, and the higher the vitrification rate, the higher the quality. Since the vitrification rate is affected by the quenching condition of the molten slag, the quenching condition is made constant by controlling the injection amount of cooling water according to the flow rate of the molten slag. In recent years, there has been an increasing need for high-quality granulated slag with high crushability suitable for cement raw materials. In order to use the granulated slag as the cement raw material, a method of controlling conditions such as a molten slag temperature during cooling, a cooling water amount, a water pressure, and a foaming reaction of the molten slag is employed. As a method of controlling the foaming reaction, Japanese Patent Application Laid-Open No. 55-20273 discloses a method in which steam is blown into a molten blast furnace slag to generate gas components of H 2 and N 2 , and as a result, the foaming reaction hardly occurs, and A method for producing slag is disclosed. Further, Japanese Patent Application Laid-Open No. 1-239042 discloses a method in which molten slag is dropped into cooling water, and the molten slag is brought into contact with a vaporized gas of cooling water during cooling and solidification to foam the slag. I have. Further, JP-A-55-28347 discloses that
As a method for producing a lightweight slag, a granulated slag obtained by adding a gaseous nitrogen-enriched compound to a molten slag to increase the amount of bonded nitrogen in the slag, and then injecting a large amount of high-pressure water to reduce the foaming weight. Is disclosed.

【0003】[0003]

【発明が解決しようとする課題】従来の高炉水砕スラグ
の製造装置は、以上のように構成されていたため、次の
ような課題が存在していた。すなわち、水砕スラグの製
造初期においては、スラグ温度が低くスラグ流量が少な
いため、単位時間当たりの溶融高炉スラグの熱量不足が
生じ、冷却水からのガス化反応の低下と溶融スラグとの
反応温度が低いために、スラグ中で発泡反応が十分起こ
らず、そのために水砕スラグを微粉砕する際に、粉砕特
性が悪く粉砕に多大なエネルギーを要していた。また、
高炉から排出される溶融スラグの時間当たりの排出量が
刻々と変化をし、溶融スラグの流量制御は困難であり、
スラグ/冷却水の比が一定にコントロールが出来ないた
めに前記比がバラツキ、水砕スラグの発泡性を左右し水
砕スラグの粉砕性に悪影響を及ぼしていた。
The conventional apparatus for producing granulated blast furnace slag has the following problems because it is constructed as described above. That is, in the early stage of the production of granulated slag, the slag temperature is low and the slag flow rate is small, so that the amount of heat of the molten blast furnace slag per unit time is insufficient, the gasification reaction from the cooling water decreases, and the reaction temperature with the molten slag increases. Therefore, the foaming reaction did not take place sufficiently in the slag, so that when the granulated slag was finely pulverized, the pulverization characteristics were poor and a large amount of energy was required for the pulverization. Also,
The amount of molten slag discharged from the blast furnace per hour changes every moment, and it is difficult to control the flow rate of molten slag.
Since the ratio of the slag / cooling water could not be controlled to a constant value, the ratio varied, affecting the foamability of the granulated slag and adversely affecting the crushability of the granulated slag.

【0004】本発明は、以上のような課題を解決するた
めになされたもので、特に、溶融スラグに高圧水が吹製
される直前に水蒸気を噴射添加することにより、水砕ス
ラグの粉砕性を改良するようにした水砕スラグの製造装
置を提供することを目的とする。
[0004] The present invention has been made to solve the above problems, and in particular, by spraying and adding steam to molten slag immediately before high-pressure water is blown, the crushability of the granulated slag is increased. It is an object of the present invention to provide an apparatus for producing granulated slag which improves the above.

【0005】[0005]

【課題を解決するための手段】本発明による水砕スラグ
の製造装置は、高炉本体から排出された溶融スラグを吹
製函の水噴射ノズルからの冷却水により冷却する水砕ス
ラグの製造装置において、前記吹製函の斜め上方位置に
設けられた水蒸気噴射ノズルを有し、前記冷却水による
冷却の前に前記溶融スラグに水蒸気を吹き込むようにし
た構成であり、また、前記水蒸気噴射ノズルのノズル孔
は、線状又は線状に配列した複数の孔よりなる構成であ
り、また、前記水蒸気噴射ノズルが接続された水蒸気供
給管の水平面に対する傾斜角度は、溶融スラグ排出流量
に応じて可変である構成である。
A granulated slag manufacturing apparatus according to the present invention is a granulated slag manufacturing apparatus for cooling molten slag discharged from a blast furnace body with cooling water from a water injection nozzle of a blowing box. A steam injection nozzle provided at an obliquely upper position of the blowing box, wherein steam is blown into the molten slag before cooling by the cooling water, and a nozzle of the steam injection nozzle The holes are formed of a plurality of holes arranged linearly or linearly, and the inclination angle of the steam supply pipe to which the steam injection nozzle is connected with respect to the horizontal plane is variable according to the molten slag discharge flow rate. Configuration.

【0006】[0006]

【発明の実施の形態】以下、図面と共に本発明による水
砕スラグの製造方法の好適な実施の形態について説明す
る。まず、図7のように、高炉本体1から排出した溶融
スラグ10はスラグ樋3を経由して吹製函4で高圧水が
吹製される時に高炉スラグの発泡は、次のような反応が
起こるものと推定される。 H2O(L)=H2O(g) 2N3-+3H2O(g)=3H2(g)+N2(g)+3
2-
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for producing granulated slag according to the present invention will be described below with reference to the drawings. First, as shown in FIG. 7, when the molten slag 10 discharged from the blast furnace main body 1 is blown with high-pressure water in the blowing box 4 via the slag gutter 3, foaming of the blast furnace slag causes the following reaction. Presumed to happen. H 2 O (L) = H 2 O (g) 2N 3- + 3H 2 O (g) = 3H 2 (g) + N 2 (g) +3
O 2-

【0007】この溶融スラグ10が発泡するには、溶融
スラグ10中に溶解している窒素が水によって化学反応
を起こし、窒素ガス等になって発生し、スラグの冷却過
程でスラグ中に固定され、気孔を形成するものと推定さ
れる。ところで、従来の水砕スラグの製法は、溶融スラ
グを高圧水で急冷破砕することにより製造するが、出滓
開始前半はスラグを流す樋の温度が低下しているため、
溶融スラグの熱が奪われる量が多く、かつ高炉から排出
される溶融スラグ量が少ないことによって溶融スラグが
冷却され、吹製函で高圧水を吹製するときにはスラグ温
度が低下しやすくなっている。従って、出滓開始前半
は、溶融スラグの量・温度が不足することで、冷却水の
ガス化反応が起こり難くなっている。そこで、水砕スラ
グ吹製初期に水蒸気を溶融スラグに吹き付けることで、
冷却水が水蒸気になる反応を補助する上に、積極的に溶
融スラグに添加・反応させる結果、スラグの発泡反応が
改善され、水砕スラグの粒を形成する開気孔、閉気孔が
多数形成されてスラグの粉砕性が改善される。さらに、
溶融スラグの温度や流量が上昇してくる水砕スラグ中期
以降も、水蒸気添加を継続することは、スラグ量の変化
によるガス化反応の変化を平滑化させるため、溶融スラ
グ表面近傍で起こる発泡反応を継続的に起こさせ安定化
させることになり好ましい。
In order for the molten slag 10 to foam, the nitrogen dissolved in the molten slag 10 undergoes a chemical reaction due to water and is generated as nitrogen gas and the like, and is fixed in the slag during the cooling process of the slag. Are assumed to form pores. By the way, the conventional method of producing granulated slag is manufactured by quenching and crushing molten slag with high-pressure water, but in the first half of the slag start, the temperature of the gutter through which the slag flows is reduced.
The amount of heat from the molten slag is large, and the amount of molten slag discharged from the blast furnace is small, so that the molten slag is cooled, and the temperature of the slag tends to decrease when blowing high-pressure water in a blow box. . Therefore, in the first half of the slag start, the amount and temperature of the molten slag are insufficient, so that the gasification reaction of the cooling water hardly occurs. Therefore, by blowing steam to the molten slag in the early stage of granulated slag blowing,
In addition to assisting the reaction of cooling water to become water vapor, as a result of actively adding and reacting to the molten slag, the foaming reaction of the slag is improved, and many open and closed pores forming granulated slag particles are formed. Thus, the slag crushability is improved. further,
Continuing steam addition even after the middle stage of granulated slag, where the temperature and flow rate of the molten slag rise, is because the foaming reaction that occurs near the surface of the molten slag is necessary to smooth the change in the gasification reaction due to the change in the amount of slag. Is continuously generated and stabilized.

【0008】また、水蒸気20の温度が200℃前後で
あるので、多量に溶融スラグ10に吹き付け添加すると
スラグ温度が低下して、逆にスラグの発泡性を阻害す
る。よって溶融スラグ10に対する吹き付け添加量は
0.01〜1.0重量%が好ましく、吹き付け添加量が
0.01重量%以下では発泡させるだけの水蒸気量が不
足して思わしくなく、1.0%を超えると溶融スラグ温
度が低下して逆に発泡を低下させ粉砕性を阻害すること
になる。
Further, since the temperature of the steam 20 is about 200 ° C., if a large amount is added to the molten slag 10 by spraying, the slag temperature is lowered, and conversely, the slag foamability is hindered. Therefore, the amount of the spray added to the molten slag 10 is preferably 0.01 to 1.0% by weight. If the amount of the spray added is 0.01% by weight or less, the amount of water vapor for foaming is insufficient, and 1.0% If it exceeds, the temperature of the molten slag decreases, conversely, the foaming decreases, and the pulverizability is impaired.

【0009】本発明は、前述のように、水蒸気を溶融ス
ラグに噴射させることによって、吹製では得られなかっ
た。即ち、水が気化するまでの気化熱を溶融スラグが奪
って温度低下を来たし、スラグの粘度低下で発泡を抑制
するのを水蒸気を溶融スラグに取り込ませることにより
防止して発泡性を高めるようにしたものである。例え
ば、図1に示す装置は本発明の水砕スラグの製造装置で
あり、高炉本体1から流出する溶融スラグ10がスラグ
樋3から落下して吹製函4の水噴射ノズル4aから噴射
される冷却水4bによって急冷されるまでに溶融スラグ
10に水蒸気20が水蒸気噴射ノズル5から噴射添加さ
れる。この水蒸気噴射ノズル5から吹き付け添加された
水蒸気20は、溶融スラグ10に取り込まれ、溶融スラ
グ10と反応してガス化反応を起こし溶融スラグ10が
膨張して発泡する。この際、吹き付ける水蒸気は溶融ス
ラグとの距離が離れるほど、接する時の温度が低下し、
その効果は半減するため、水蒸気吹付け距離を近く保ち
つつ均一に吹き付けるには水蒸気噴射ノズル5の形状を
線状又は複数孔とし、拡散させる方がその効果は大きく
なる。この発泡した溶融スラグ10は吹製函4の噴射ノ
ズル4aから噴射された多量の冷却水4bによって急冷
と破砕処理がなされる。即ち、冷却水4bで急冷する直
前に水蒸気20を溶融スラグ10中に取り込ませると、
冷却水4bのガス化反応を補助し、溶融スラグ10の発
泡反応を促進させる。この水蒸気20の噴射圧力は溶融
スラグ10表面で3kg/cm2以下であれば良く、噴
射圧力が3kg/cm2を超えると、溶融スラグ10が
飛び散り危険である。なお、水蒸気20の噴射量及び圧
力等は水蒸気噴射ノズル5を有する水蒸気供給管30の
圧力計31で監視しつつ一対のバルブ32、33の開弁
調整を行うことにより行われる。また、スラグ樋から流
れ落ちる溶融スラグは、量が増えるに従って水平面に対
する傾斜角度が低下してくる。従って、吹製函4の斜め
上方に位置した前記水蒸気噴射ノズル5は、水蒸気供給
管30の水平面Hに対する傾斜角度は図7に示した通
り、水砕開始時に45°とし、出サイ速度が1T/mi
nを超えると、その角度を40°、2T/minを超え
ると30°に設定され、この水蒸気供給管30は固定部
40との間で鎖41により保持し、図8に示したスクリ
ュコンベア50による搬送量から求めた出サイ速度に応
じて鎖41を巻上げて、水蒸気噴射ノズル5の角度を調
整している。なお、この図8の構成においては、スラグ
樋3の下流には水砕樋51、クッションタンク52、ス
クリュコンベア50、ベルトコンベア53及び成品槽5
4が配設され、前述のように、計量装置であるメリック
55で搬送量を計量している。但し、30°未満の角度
は溶融スラグが飛散して危険な上、水冷が不十分なスラ
グが混ざることになる。また、この水蒸気噴射ノズル5
の形状は、図2のように先端が溶融スラグに45°で接
するように曲折することで、水蒸気と溶融スラグの接触
反応が確実に起こるようにされ、その開口5aの形状も
図3の線状、図4の線状に配列した複数の孔よりなる構
成が採用されている。
As described above, the present invention has not been obtained by blowing the steam into the molten slag. That is, the molten slag deprives the heat of vaporization until the water is vaporized and the temperature decreases, and the suppression of foaming due to the decrease in viscosity of the slag is prevented by incorporating steam into the molten slag to enhance the foaming property. It was done. For example, the apparatus shown in FIG. 1 is an apparatus for producing granulated slag of the present invention, in which molten slag 10 flowing out of a blast furnace main body 1 falls from a slag gutter 3 and is injected from a water injection nozzle 4 a of a blow box 4. Steam 20 is injected from the steam injection nozzle 5 to the molten slag 10 before being rapidly cooled by the cooling water 4b. The steam 20 sprayed and added from the steam injection nozzle 5 is taken into the molten slag 10 and reacts with the molten slag 10 to cause a gasification reaction, whereby the molten slag 10 expands and foams. At this time, the temperature of the steam to be blown decreases as the distance from the molten slag increases,
Since the effect is reduced by half, in order to uniformly spray while keeping the steam spraying distance close, the effect is greater when the shape of the steam spray nozzle 5 is linear or a plurality of holes and diffused. The foamed molten slag 10 is rapidly cooled and crushed by a large amount of cooling water 4b injected from the injection nozzle 4a of the blow box 4. That is, when the steam 20 is taken into the molten slag 10 immediately before being rapidly cooled by the cooling water 4b,
The gasification reaction of the cooling water 4b is assisted, and the foaming reaction of the molten slag 10 is promoted. The injection pressure of the steam 20 only needs to be 3 kg / cm 2 or less on the surface of the molten slag 10. If the injection pressure exceeds 3 kg / cm 2 , the molten slag 10 may be scattered. The injection amount and pressure of the steam 20 are monitored by the pressure gauge 31 of the steam supply pipe 30 having the steam injection nozzle 5 and the opening of the pair of valves 32 and 33 is adjusted. In addition, as the amount of the molten slag flowing down from the slag gutter increases, the inclination angle with respect to the horizontal plane decreases. Therefore, as shown in FIG. 7, the steam injection nozzle 5 positioned obliquely above the blow box 4 has an inclination angle of 45 ° to the horizontal plane H of the steam supply pipe 30 at the start of the water granulation, and an output speed of 1T. / Mi
When the angle exceeds n, the angle is set to 40 °, and when the angle exceeds 2 T / min, the angle is set to 30 °. The steam supply pipe 30 is held by the chain 41 between the steam supply pipe 30 and the screw conveyor 50 shown in FIG. The angle of the water vapor jet nozzle 5 is adjusted by winding up the chain 41 in accordance with the outgoing speed obtained from the conveyance amount of the water vapor. In the configuration of FIG. 8, the granulating gutter 51, the cushion tank 52, the screw conveyor 50, the belt conveyor 53, and the product tank 5 are located downstream of the slag gutter 3.
4 and the transport amount is measured by the metric device 55 as described above. However, if the angle is less than 30 °, the molten slag is scattered and dangerous, and slag with insufficient water cooling is mixed. In addition, the steam injection nozzle 5
As shown in FIG. 2, the tip is bent so as to be in contact with the molten slag at 45 ° so that the contact reaction between the steam and the molten slag is surely caused. The shape of the opening 5a is also the line shown in FIG. And a configuration composed of a plurality of holes arranged linearly in FIG.

【0010】次に、本出願人が図1の構成により行った
水砕スラグの製造について述べる。まず、冷却水4bの
水量を26〜52T/Hとし、溶融スラグ10に吹き付
ける水蒸気20の吹き付け量を変化させ、得られた製品
スラグのブレーン値を測定した。図5に溶融スラグ量に
対する水蒸気量とブレーン値の関係を示す。図5から、
溶融スラグに対する水蒸気添加量が1.0重量%まで
は、ブレーン値が改善されるが、それ以上添加量を増や
してもスラグの発泡反応がスラグの表面でしか起こりに
くいので、ブレーン値は水蒸気量に比例して向上しな
い。また、溶融スラグに対する水蒸気添加量が1.0重
量%を超えると、溶融スラグを過冷却するため、返って
ブレーン値は低下する。
Next, the production of granulated slag performed by the applicant of the present invention with the configuration shown in FIG. 1 will be described. First, the water amount of the cooling water 4b was set to 26 to 52 T / H, and the spray amount of the steam 20 sprayed on the molten slag 10 was changed, and the Blaine value of the obtained product slag was measured. FIG. 5 shows the relationship between the amount of steam and the Blaine value with respect to the amount of molten slag. From FIG.
Up to 1.0% by weight of steam added to the molten slag, the Blaine value is improved. However, even if the added amount is further increased, the slag foaming reaction hardly occurs only on the slag surface. Does not improve in proportion to If the amount of water vapor added to the molten slag exceeds 1.0% by weight, the molten slag is supercooled, so that the Blaine value decreases.

【0011】また、冷却水4bの水量を26〜52T/
Hとし、溶融スラグ10に吹き付ける水蒸気の吹き付け
量を22.6kg/Hとした場合と水蒸気を添加しない
場合の水砕開始から終了までのブレーン値の推移を図6
に示す。図6から、水砕初期では、溶融スラグに対する
水蒸気添加量を1.0重量%以下に制御することで、冷
却水が水蒸気になる反応を補助する上に、積極的に溶融
スラグと反応させることができた結果、スラグの発泡反
応が改善された。また、同時に、スラグの溶融スラグの
過冷却を防止できた結果ブレーン値が改善されている。
The amount of cooling water 4b is 26 to 52 T /
H, and the transition of the Blaine value from the start to the end of granulation when the amount of steam blown to the molten slag 10 is 22.6 kg / H and when steam is not added is shown in FIG.
Shown in From FIG. 6, in the initial stage of water granulation, by controlling the amount of steam added to the molten slag to 1.0% by weight or less, it is possible to assist the reaction of the cooling water to become steam and to actively react with the molten slag. As a result, the foaming reaction of the slag was improved. At the same time, the supercooling of the molten slag of the slag was prevented, so that the Blaine value was improved.

【0012】[実施例]次に、図1に示した装置を使用
して、水砕開始から終了まで連続操業を実施した。操業
中の水蒸気圧力は、2〜4kg/cm2、水蒸気流量
は、22.6kg/Hに設定した。その他の水砕条件
は、冷却水量26〜52T/H、冷却水温度60〜90
℃と通常通りとした。表1に、この時の操業条件を示
す。併せて、水蒸気過剰添加時と水蒸気添加なしの場合
を示す。高炉側の操業条件も通常通りで、スラグ温度1
470〜1510℃、スラグの流量は出サイ初期が0.
5T/min、末期が4T/minであった。
Example Next, continuous operation was performed from the start to the end of granulation using the apparatus shown in FIG. During the operation, the steam pressure was set at 2 to 4 kg / cm 2 , and the steam flow rate was set at 22.6 kg / H. Other water granulation conditions include a cooling water amount of 26 to 52 T / H and a cooling water temperature of 60 to 90.
° C as usual. Table 1 shows the operating conditions at this time. In addition, the case of adding excess steam and the case of not adding steam are shown. The operating conditions on the blast furnace side are as usual, and the slag temperature is 1
470 to 1510 ° C, the flow rate of slag is 0.
5 T / min, the end stage was 4 T / min.

【0013】[0013]

【表1】 [Table 1]

【0014】本実施例で得られた製品スラグは、ブレー
ン値の平均が4390cm2/gであり、水蒸気を添加
しない場合のブレーン値の平均4360cm2/gから
改善された。また、水蒸気添加量が多すぎると、溶融ス
ラグの過冷却となり、ブレーン値の改善は見られなかっ
た。水蒸気添加量を制御した場合には、水砕初期のブレ
ーン値が改善された結果、製品スラグの水砕初期〜末期
までのブレーン値のばらつきが低減できた。
The product slag obtained in this example had an average Blaine value of 4390 cm 2 / g, which was improved from the average Blaine value of 4360 cm 2 / g when no steam was added. On the other hand, if the amount of added steam was too large, the molten slag was supercooled, and no improvement in the Blaine value was observed. When the amount of steam added was controlled, as a result of the improvement of the Blaine value in the initial stage of granulation, the variation in the Blaine value from the initial stage to the end stage of the granulated product slag could be reduced.

【0015】[0015]

【発明の効果】本発明による水砕スラグの製造装置は、
以上のように構成されているため、次のような効果を得
ることができる。すなわち、水蒸気噴射ノズルのノズル
孔を線状又は線状に配列した複数孔とすることにより、
水蒸気と溶融スラグの距離を近付け、水蒸気の温度低下
を抑制できると共に、均一に吹付けることにより水砕初
期の発泡反応が改善された。また、水蒸気供給管の水平
面に対する角度を出サイ速度に応じて変化させたことに
よりスラグの飛散が防止されると共に水冷が不十分なス
ラグが混ざることを防止でき、その結果、水砕末期の発
泡反応の改善が達成された。さらに、噴射ノズル先端が
溶融スラグに対して45°で水蒸気が噴射されるように
したため、溶融スラグと水蒸気の接触効率が改善され、
出サイ時間内の発泡反応のバラツキを低減することがで
きた。従って、以上の各効果により、製品スラグ全体の
粉砕性向上が可能となり、かつ製品スラグの品質のバラ
ツキの低減が達成された。
The apparatus for producing granulated slag according to the present invention comprises:
With the configuration described above, the following effects can be obtained. That is, by making the nozzle holes of the steam injection nozzle linear or a plurality of holes arranged in a line,
By shortening the distance between the steam and the molten slag to suppress the temperature decrease of the steam, the foaming reaction at the initial stage of the granulation was improved by uniformly spraying. Also, by changing the angle of the steam supply pipe with respect to the horizontal plane in accordance with the outgoing speed, it is possible to prevent slag from scattering and to prevent slag with insufficient water cooling from being mixed. As a result, foaming at the end of granulation Improved response was achieved. Furthermore, since the steam at the tip of the spray nozzle is sprayed at 45 ° to the molten slag, the contact efficiency between the molten slag and the steam is improved,
It was possible to reduce the variation of the foaming reaction during the delivery time. Therefore, by the above effects, the crushability of the entire product slag can be improved, and the variation in the quality of the product slag can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明による水砕スラグの製造装置を示す構成
図である。
FIG. 1 is a configuration diagram showing an apparatus for producing granulated slag according to the present invention.

【図2】図1の要部の拡大図である。FIG. 2 is an enlarged view of a main part of FIG.

【図3】図1の要部の拡大図である。FIG. 3 is an enlarged view of a main part of FIG. 1;

【図4】図3の他の形態を示す拡大図である。FIG. 4 is an enlarged view showing another embodiment of FIG. 3;

【図5】水砕スラグを粉砕したときのブレーン値と水蒸
気添加の関係を示す特性図である。
FIG. 5 is a characteristic diagram showing the relationship between the Blaine value and the addition of steam when the granulated slag is pulverized.

【図6】出銑初期から末期に至る間のブレーン値の変化
を示す特性図である。
FIG. 6 is a characteristic diagram showing a change in a Blaine value from the initial stage to the end stage of tapping.

【図7】本発明における出サイ速度と出サイ時間との関
係を示す特性図である。
FIG. 7 is a characteristic diagram showing the relationship between the outgoing speed and the outgoing time in the present invention.

【図8】図1のスラグ樋の下流側を示す構成図である。FIG. 8 is a configuration diagram showing a downstream side of the slag gutter of FIG. 1;

【図9】水砕スラグ製造装置が配置された高炉周りを示
す概略構成図である。
FIG. 9 is a schematic configuration diagram showing a periphery of a blast furnace in which a granulated slag producing apparatus is arranged.

【図10】水砕スラグの粒子構造図である。FIG. 10 is a particle structure diagram of granulated slag.

【符号の説明】[Explanation of symbols]

1 高炉本体 3 スラグ樋 4 吹製函 4a 水噴射ノズル 5 水蒸気噴射ノズル 5a ノズル孔 10 溶融スラグ 20 水蒸気 DESCRIPTION OF SYMBOLS 1 Blast furnace main body 3 Slag gutter 4 Blow-making box 4a Water injection nozzle 5 Steam injection nozzle 5a Nozzle hole 10 Melted slag 20 Steam

フロントページの続き (72)発明者 奥 律明 広島県呉市昭和町11番1号 日新製鋼株式 会社呉製鉄所内 Fターム(参考) 4G012 JB01 JC05 JH04 JH05 Continued on the front page (72) Inventor Ritsuaki Oku 11-1 Showa-cho, Kure-shi, Hiroshima F-term in Nissin Steel Co., Ltd. Kure Works (reference) 4G012 JB01 JC05 JH04 JH05

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 高炉本体(1)から排出された溶融スラグ
(10)を吹製函(4)の水噴射ノズル(4a)からの冷却水によ
り冷却する水砕スラグの製造装置において、前記吹製函
(4)の斜め上方位置に設けられた水蒸気噴射ノズル(5)を
有し、前記冷却水(4b)による冷却の前に前記溶融スラグ
(10)に水蒸気(20)を吹きつけるように構成したことを特
徴とする水砕スラグの製造装置。
1. The molten slag discharged from the blast furnace body (1)
In the apparatus for producing granulated slag which cools (10) with cooling water from the water injection nozzle (4a) of the blowing box (4),
(4) has a steam injection nozzle (5) provided diagonally above the molten slag before cooling by the cooling water (4b)
An apparatus for producing granulated slag, wherein steam (20) is blown onto (10).
【請求項2】 前記水蒸気噴射ノズル(5)のノズル孔(5
a)は、線状又は線状に配列した複数の孔よりなることを
特徴とする請求項1記載の水砕スラグの製造装置。
2. The nozzle hole (5) of the steam injection nozzle (5).
The apparatus for producing granulated slag according to claim 1, wherein a) comprises a plurality of holes arranged linearly or linearly.
【請求項3】 前記水蒸気噴射ノズル(5)が接続された
水蒸気供給管(30)の水平面に対する傾斜角度は、溶融ス
ラグ排出流量に応じて可変であることを特徴とする請求
項1又は2記載の水砕スラグの製造装置。
3. An inclined angle of a steam supply pipe (30) connected to the steam injection nozzle (5) with respect to a horizontal plane is variable according to a molten slag discharge flow rate. Granulated slag production equipment.
JP2000044534A 2000-02-22 2000-02-22 Apparatus for producing water-granulated slag Withdrawn JP2001233644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000044534A JP2001233644A (en) 2000-02-22 2000-02-22 Apparatus for producing water-granulated slag

Publications (1)

Publication Number Publication Date
JP2001233644A true JP2001233644A (en) 2001-08-28

Family

ID=18567273

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2001233644A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120073404A1 (en) * 2009-12-30 2012-03-29 Hyundai Steel Company Method of recovering valuable metal from slag
US20120073406A1 (en) * 2009-12-30 2012-03-29 Hyundai Steel Company Method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120073404A1 (en) * 2009-12-30 2012-03-29 Hyundai Steel Company Method of recovering valuable metal from slag
US20120073406A1 (en) * 2009-12-30 2012-03-29 Hyundai Steel Company Method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate
JP2012528783A (en) * 2009-12-30 2012-11-15 ヒュンダイ スチール カンパニー Valuable metal recovery of slag and method and apparatus for producing multifunctional aggregate
US8534578B2 (en) * 2009-12-30 2013-09-17 Hyundai Steel Company Method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate

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