JPH05339023A - Heater for tapping spout of electric furnace for production of slag wool - Google Patents

Heater for tapping spout of electric furnace for production of slag wool

Info

Publication number
JPH05339023A
JPH05339023A JP17192392A JP17192392A JPH05339023A JP H05339023 A JPH05339023 A JP H05339023A JP 17192392 A JP17192392 A JP 17192392A JP 17192392 A JP17192392 A JP 17192392A JP H05339023 A JPH05339023 A JP H05339023A
Authority
JP
Japan
Prior art keywords
slag
molten metal
electric furnace
slag wool
tapping
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.)
Pending
Application number
JP17192392A
Other languages
Japanese (ja)
Inventor
Eiji Ichimatsu
栄司 一松
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 Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP17192392A priority Critical patent/JPH05339023A/en
Publication of JPH05339023A publication Critical patent/JPH05339023A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/08—Bushings, e.g. construction, bushing reinforcement means; Spinnerettes; Nozzles; Nozzle plates
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/04—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor
    • C03B37/05—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor by projecting molten glass on a rotating body having no radial orifices
    • C03B37/055—Manufacture of glass fibres or filaments by using centrifugal force, e.g. spinning through radial orifices; Construction of the spinner cups therefor by projecting molten glass on a rotating body having no radial orifices by projecting onto and spinning off the outer surface of the rotating body

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)

Abstract

PURPOSE:To prevent the solidification of a molten metal in the middle of a tapping spout when the molten metal temp. in an electric furnace for production of slag wool is low. CONSTITUTION:The freely angle adjustable tapping spout 3 for introducing molten slag 4 tapped from the electric furnace 1 for production of the slag wool to a fiber forming device 6 is provided with an induction heater 9 to preheat the tapping spout 3 prior to tapping. As a result, the tapping spout is preheated prior to the tapping of the molten metal, by which the solidification of the molten metal in the middle of the tapping spout is obviated and the degradation in the quality of the slag wool by overheating of the molten metal is prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、断熱材として使用さ
れるスラグウール、グラスファイバー等の製造に使用さ
れるスラグウール電気炉出湯樋の加熱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag wool electric furnace tap water heating device used for producing slag wool, glass fiber and the like used as a heat insulating material.

【０００２】[0002]

【従来の技術】スラグウール（鋼滓繊維）は、Ｓｉ
Ｏ2、ＣａＯ、Ａｌ2Ｏ3を主成分とする製鉄の鉱滓また
は精錬の鋼滓（以下スラグという）を主原料としたもの
を繊維化したものである。スラグウールの製造方法は、
キュポラあるいは電気炉でスラグを１５００〜１６００
℃の高温に溶解し、これを炉底から高速回転している円
盤上に流下せしめ、遠心力によって飛散させて繊維化す
るか、あるいは炉底から流下させて圧縮空気または高圧
蒸気によって吹飛ばして繊維化するのが一般的である。2. Description of the Related Art Slag wool (steel slag fiber) is made of Si.
It is a fiberized material obtained from a main raw material of iron slag or refined steel slag (hereinafter referred to as slag) containing O 2 , CaO and Al 2 O 3 as main components. The manufacturing method of slag wool is
1500-1600 slag in cupola or electric furnace
It is melted at a high temperature of ℃, and it is made to flow down from the furnace bottom onto a disk that is rotating at high speed and scattered by centrifugal force to form fibers, or it is made to flow down from the furnace bottom and blown off by compressed air or high-pressure steam. It is generally made into fibers.

【０００３】このスラグウールの製造においては、溶融
スラグを主原料とする場合と、コールドスラグまたは天
然玄武岩を主原料とする場合がある。コールドスラグま
たは天然玄武岩を主原料とする場合は、前記したとおり
キュポラあるいは電気炉で高温に溶解する必要があるた
め、燃料費あるいは電力費の関係でコスト高になるの
で、溶融スラグを主原料として用いる方がエネルギーコ
スト上有利である。また、溶融スラグを主原料として用
いる場合は、溶融スラグの表面張力、粘性がスラグウー
ルの性状を大きく左右するため、一般に電気炉で吹製前
のスラグの成分調整と温度調整を行っている。スラグの
成分調整は、高炉等から排出された溶融スラグをスラグ
ウールに適した成分に調質するために行うもので、スラ
グウールに必要な成分としての酸性成分ならびに塩基性
成分が不足し、ＣａＯが過剰となっているので、その化
学成分の調整を行うため、例えばＳｉＯ2、Ａｌ2Ｏ3の
酸性成分ならびにＭｇＯ、アルカリ（Ｎａ2Ｏ、Ｋ2Ｏ
等）の塩基性成分を加える。この成分調整によって、繊
維径、繊維長さ、対候性、粒子含有率等が良好となり、
軽量、高強度の加工性良好なスラグウールを得ることが
できる。また、スラグの温度調整は、高炉等から排出さ
れた通常１３８０〜１４５０℃のスラグから性状良好な
スラグウールを得るには、さらに温度を上げ１５００〜
１６００℃に高める必要がある。In the production of this slag wool, there are cases where molten slag is used as the main raw material and cold slag or natural basalt is used as the main raw material. When using cold slag or natural basalt as the main raw material, it is necessary to melt it at a high temperature in a cupola or electric furnace as described above, so the cost will increase due to the relationship between fuel cost and electric power cost. It is advantageous to use it in terms of energy cost. Further, when the molten slag is used as a main raw material, the surface tension and the viscosity of the molten slag greatly influence the properties of the slag wool, so that the component adjustment and temperature adjustment of the slag before blowing are generally performed in an electric furnace. The component adjustment of slag is performed in order to prepare the molten slag discharged from the blast furnace into a component suitable for slag wool, and lacks the acidic component and the basic component as components necessary for slag wool. Is excessive, so that the chemical components are adjusted, for example, the acidic components of SiO 2 , Al 2 O 3 , MgO and alkali (Na 2 O, K 2 O) are used.
Etc.) basic component. By adjusting this component, the fiber diameter, fiber length, weatherability, particle content, etc. become good,
It is possible to obtain a slag wool which is lightweight and has high strength and good workability. Moreover, in order to obtain slag wool having good properties from the slag discharged from a blast furnace or the like and having a temperature of usually 1380 to 1450 ° C., the temperature of the slag is further increased to 1500 to 1500.
It is necessary to raise it to 1600 ° C.

【０００４】上記スラグウールの製造に使用される電気
炉は、絶縁物用の抵抗加熱を昇温方法としている特殊な
もので、断熱材として使用されるガラス繊維、ロックウ
ール等の製造に多く用いられている。この電気炉からの
溶融スラグの出湯は、現在作業員手動操作により炉体を
傾転させて定量出湯させるか、あるいは手動操作または
自動的に出湯孔のスライドゲートの開度調整を実施し、
定量出湯させている。さらにこの出湯孔は、主原料、副
原料の温度調整（昇温）を行っているときは不定形耐火
物により閉じられている。温度調整が終了すれば、出湯
孔の不定形耐火物の開孔作業を作業員が行い出湯とな
る。The electric furnace used for producing the slag wool is a special one in which resistance heating for an insulator is used as a temperature raising method, and is often used for producing glass fiber, rock wool, etc. used as a heat insulating material. Has been. The molten slag discharged from the electric furnace is currently tilted by a worker to manually discharge a fixed amount of molten slag, or manually or automatically adjusted to open the slide gate of the discharge hole.
A certain amount of hot water is discharged. Further, this tap hole is closed by an amorphous refractory when the temperature of the main raw material and the sub raw material is adjusted (temperature rise). When the temperature adjustment is completed, the worker opens the tap hole to open the irregular-shaped refractory and the tap hole is tapped.

【０００５】しかし、溶融スラグを主原料とするスラグ
ウールの製造に用いる電気炉への主原料、副原料の投入
は、バッチ処理で行われているが、溶融スラグの出湯
は、電気炉二基を用い、連続的に、かつ一定温度、一定
流量に制御するのが、スラグウールの品質管理の面から
必要である。この場合の出湯温度の制御は、出湯前の温
度調整中は直接溶湯温度を測定する手段がないため、一
般に電気炉の鉄皮温度、抵抗加熱の電流値を指標として
予測している。したがって、出湯温度は、一般に±１０
０℃程度の温度調整誤差は必ず出る。However, although the main raw material and the auxiliary raw material are put into the electric furnace used for the production of slag wool whose main raw material is molten slag, the molten slag is discharged from two electric furnaces. In order to control the quality of slag wool, it is necessary to control continuously and at a constant temperature and a constant flow rate by using. Since there is no means for directly measuring the molten metal temperature during temperature adjustment before tapping, the control of the tapping temperature in this case is generally predicted using the iron shell temperature of the electric furnace and the current value of resistance heating as indexes. Therefore, the tap water temperature is generally ± 10.
There is always a temperature adjustment error of about 0 ° C.

【０００６】[0006]

【発明が解決しようとする課題】上記スラグウールの製
造に用いる電気炉での出湯温度調整ミスは、スラグウー
ルの品質を悪化させることとなる。すなわち、出湯温度
が高過ぎるとスラグウールの繊維品質が悪化し、逆に低
過ぎると出湯樋の途中で溶湯が凝固し、溶湯の流れ方向
を変化させるため、樋から高速回転円盤上へ落下する方
向も変わり、一度角度調整されていた出湯樋の角度を何
度となく再調整しなければならない。出湯樋の角度の再
調整中は、スラグウールの品質、歩留共に悪く、出湯樋
の角度を元の最適な状態に戻すには、時間を要しその損
失は大きい。このため、通常は作業員が調整温度を高め
に設定し、溶湯温度の低い場合における出湯樋の角度の
再調整を軽減しているが、溶湯温度の高温側への外れに
よるスラグウールの繊維品質の悪化を招くこととなる。Problems with adjusting the tapping temperature in the electric furnace used for producing the slag wool deteriorate the quality of the slag wool. That is, if the tapping temperature is too high, the fiber quality of the slag wool deteriorates, and conversely, if it is too low, the molten metal solidifies in the middle of the tapping gutter and changes the flow direction of the molten metal, so it falls from the gutter onto the high-speed rotating disk. The direction also changed, and the angle of the dewatering gutter that had been adjusted once had to be readjusted many times. During the readjustment of the angle of the tap gutter, the quality and yield of the slag wool are poor, and it takes time to restore the angle of the tap gutter to its original optimum state, and the loss is large. For this reason, workers usually set the adjustment temperature higher to reduce the readjustment of the angle of the tapping gutter when the temperature of the molten metal is low, but the fiber quality of the slag wool due to the deviation of the molten metal temperature to the high temperature side. Will be aggravated.

【０００７】この発明の目的は、前記スラグウール製造
用電気炉からの出湯において、溶湯温度が低い場合にお
ける出湯樋の途中での溶湯の凝固を防止できる出湯樋加
熱装置を提供することにある。An object of the present invention is to provide an outlet hot water gutter heating device capable of preventing the solidification of the molten metal during the tapping hot water when the molten metal temperature is low in the hot water coming out of the electric furnace for producing slag wool.

【０００８】[0008]

【課題を解決するための手段】本発明者らは、上記目的
を達成すべく鋭意検討を重ねた。その結果、溶湯温度が
低いために起こる出湯樋上の溶湯の凝固発生は、特に開
孔作業直後の出湯開始時、出湯樋温度が低いために発生
し易いことを究明した。したがって、出湯開始前に誘導
加熱装置を用いて出湯樋温度を高く保持することによっ
て、溶湯温度が低い場合における出湯樋の途中での溶湯
の凝固のほとんどを防止できるとの結論に至り、この発
明に到達した。Means for Solving the Problems The inventors of the present invention have made extensive studies to achieve the above object. As a result, it was clarified that solidification of the melt on the tap gutter due to the low melt temperature is likely to occur especially at the start of tapping immediately after the opening work because the tap temperature is low. Therefore, it is concluded that most of the solidification of the molten metal in the middle of the tapping can be prevented by keeping the tapping gutter temperature high by using the induction heating device before starting tapping, when the molten metal temperature is low. Reached

【０００９】すなわちこの発明は、スラグウール製造用
電気炉から出湯された溶融スラグを、繊維化装置に導く
角度調整自在の出湯樋に誘導加熱装置を設けたことを特
徴とするスラグウール製造用電気炉出湯樋の加熱装置で
ある。That is, the present invention is characterized in that the molten slag discharged from the electric furnace for manufacturing slag wool is provided with an induction heating device in a tap gutter with an adjustable angle for guiding the molten slag to a fiberizing device. It is a heating device for the furnace outflow gutter.

【００１０】[0010]

【作用】この発明においては、電気炉から出湯された溶
融スラグを繊維化装置に導く出湯樋に誘導加熱装置を設
けたから、電気炉からの溶融スラグの出湯に先立ち、誘
導加熱装置を用いて出湯樋を加熱し、出湯樋温度を予め
溶融スラグの温度近くまで昇温せしめることができ、電
気炉からの溶融スラグの溶湯温度が低いために発生して
いた出湯樋上での溶湯の凝固の殆どを防止することがで
きる。したがって、この発明装置によれば、出湯樋上の
溶湯の凝固がなくなるから、電気炉での溶湯温度を若干
高めに設定する必要がなくなるため、溶湯の過熱による
スラグウールの品質悪化を抑制することができる。In the present invention, since the induction heating device is provided in the tapping gutter that guides the molten slag discharged from the electric furnace to the fiberizing device, the induction heating device is used to discharge the molten slag before discharging the molten slag from the electric furnace. By heating the gutter, it is possible to raise the temperature of the outgoing gutter to near the temperature of the molten slag beforehand, and most of the solidification of the molten metal on the outgoing gutter that occurred because the molten metal temperature of the molten slag from the electric furnace was low. Can be prevented. Therefore, according to the device of the present invention, solidification of the molten metal on the tap gutter is eliminated, and it is not necessary to set the molten metal temperature in the electric furnace to a slightly higher temperature, so that deterioration of the quality of slag wool due to overheating of the molten metal can be suppressed. it can.

【００１１】出湯樋に設ける誘導過熱装置は、角度調整
自在の出湯樋との間隔が常に一定間隔を保持するように
設置することがひつようである。また、誘導過熱装置の
周波数、電気容量は、出湯樋の材質、形状、加熱温度等
に応じて適宜選定すればよく、特に限定されないが、２
００Ｈｚ、１００ｋＷ程度で十分である。It is likely that the induction heating device provided in the tap gutter is installed so that the angle between the tap gutter and the tap gutter whose angle can be adjusted is always kept constant. Further, the frequency and electric capacity of the induction heating device may be appropriately selected according to the material, shape, heating temperature, etc. of the outlet gutter, and are not particularly limited.
00 Hz and 100 kW are sufficient.

【００１２】[0012]

【実施例】以下にこの発明の詳細を実施の一例を示す図
１および図２に基いて説明する。図１はこの発明の出湯
樋加熱装置を設けたスラグウール製造装置の全体構造
図、図２は出湯樋加熱装置を設けた出湯樋の縦断面図で
ある。図１および図２において、１は溶融スラグの成分
調整および温度調整を行う電気炉、２は電気炉１の出湯
口、２ａは出湯口２の大きさを調整するスライドゲー
ト、３は出湯口２から出湯された溶湯４を複数の高速回
転円盤５からなる繊維化装置６に導く角度調整自在の出
湯樋である。出湯樋３には、出湯樋３と常に一定の間隔
を保持した状態で鉄芯７とコイル８からなる誘導加熱装
置９が設けられ、コイル８に交流電流を通じれば、鎖線
で示す誘導電流１０により出湯樋３が加熱されるように
構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is an overall structural view of a slag wool manufacturing apparatus provided with a tap water heating device of the present invention, and FIG. 2 is a vertical sectional view of a tap water heater provided with a tap water heating device. In FIG. 1 and FIG. 2, 1 is an electric furnace for adjusting components of molten slag and temperature, 2 is a tap hole of the electric furnace 1, 2a is a slide gate for adjusting the size of the tap port 2, 3 is a tap port 2 This is a tap gutter with an adjustable angle that guides the molten metal 4 that has been tapped from the fiber to a fiberizing device 6 composed of a plurality of high-speed rotating disks 5. An induction heating device 9 composed of an iron core 7 and a coil 8 is provided in the tap water gutter 3 while keeping a constant distance from the tap water gutter 3, and if an alternating current is passed through the coil 8, an induction current 10 indicated by a chain line is obtained. The hot spring gutter 3 is configured to be heated by.

【００１３】上記のとおり構成したから、電気炉１に高
炉等から排出された溶融スラグを装入して加熱し、成分
調整用原料を投入して成分調整すると共に、１５００〜
１６００℃に温度調整した。そして、電気炉１から溶湯
を出湯するに先立ち、誘導加熱装置９のコイル８に周波
数２００Ｈｚの交流電流を通電して誘導電流１０により
出湯樋３を５００℃に予熱した。ついでスライドゲート
２ａを開として出湯口２から溶湯４を出湯し、角度調整
された出湯樋３を介して複数の高速回転円盤５からなる
繊維化装置６に導き、吹製してスラグウール１１を製造
した。この場合において、溶湯４の温度は１４８０℃以
下に低下することがなく、出湯樋３の途中で溶湯４の凝
固は認められず、スラグウール１１の繊維径は、４μで
安定していた。なお、比較のため、コイル８に交流電流
を通電せず、出湯樋３の予熱を行わずに溶湯４を出湯
し、高速回転円盤５に落下させて吹製し、スラグウール
を製造した。この場合は、時々溶湯４の温度が１４６０
℃に低下して出湯樋３の途中で溶湯４が凝固し、溶湯４
の流れ方向が変化して高速回転円盤５への落下方向が変
り、スラグウール１１の繊維径が６〜１０μと大きく変
動し、出湯樋３の傾斜角度の再調整に１０分を要した。With the above-described structure, the molten slag discharged from the blast furnace or the like is charged into the electric furnace 1 and heated, and the raw material for adjusting the components is added to adjust the components.
The temperature was adjusted to 1600 ° C. Then, before the molten metal was discharged from the electric furnace 1, an alternating current having a frequency of 200 Hz was applied to the coil 8 of the induction heating device 9 to preheat the molten metal discharge trough 3 to 500 ° C. by the induction current 10. Then, the slide gate 2a is opened, the molten metal 4 is discharged from the discharge port 2, and the molten metal 4 is guided to a fiberizing device 6 composed of a plurality of high-speed rotating disks 5 through an angle-adjusted discharge gutter 3 and blown to produce a slag wool 11. Manufactured. In this case, the temperature of the molten metal 4 did not drop below 1480 ° C., no solidification of the molten metal 4 was observed in the middle of the tap gutter 3, and the fiber diameter of the slag wool 11 was stable at 4 μm. For comparison, an alternating current was not passed through the coil 8 and the molten metal 4 was tapped without preheating the tap gutter 3 and dropped onto a high-speed rotating disk 5 to blow the slag wool. In this case, the temperature of the molten metal 4 is sometimes 1460.
℃ and the molten metal 4 solidifies in the middle of the discharge gutter 3
Of the slag wool 11 varied greatly from 6 to 10 μm, and it took 10 minutes to readjust the inclination angle of the tap gutter 3.

【００１４】[0014]

【発明の効果】以上述べたとおり、この発明によれば、
スラグウール製造用電気炉の出湯樋を溶湯の出湯に先立
ち、予熱することができるから、溶湯温度が多少低くて
も出湯樋途中で溶湯が凝固することがない。このため、
溶湯温度を若干高めに設定する必要がなく、溶湯の過熱
によるスラグウールの品質悪化を防止することができ
る。As described above, according to the present invention,
Since the tapping gutter of the electric furnace for producing slag wool can be preheated prior to the tapping of the molten metal, the molten metal does not solidify during the tapping even when the molten metal temperature is slightly low. For this reason,
It is not necessary to set the molten metal temperature slightly higher, and it is possible to prevent deterioration of the quality of the slag wool due to overheating of the molten metal.

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

【図１】この発明の出湯樋加熱装置を設けたスラグウー
ル製造装置の全体構造図である。FIG. 1 is an overall structural diagram of a slag wool manufacturing apparatus provided with a tap water heating device of the present invention.

【図２】この発明の出湯樋加熱装置を設けた出湯樋の縦
断面図である。FIG. 2 is a vertical cross-sectional view of an outlet hot water gutter provided with an outlet hot water gutter heating device of the present invention.

【符号の説明】[Explanation of symbols]

１ 電気炉 ２ 出湯口 ２ａ スライドゲート ３ 出湯樋 ４ 溶湯 ５ 高速回転円盤 ６ 繊維化装置 ７ 鉄芯 ８ コイル ９ 誘導加熱装置 １０ 誘導電流 １１ スラグウール DESCRIPTION OF SYMBOLS 1 Electric furnace 2 Dew gate 2a Slide gate 3 Dew gutter 4 Melt 5 High-speed rotating disk 6 Fiberizing device 7 Iron core 8 Coil 9 Induction heating device 10 Induction current 11 Slag wool

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 スラグウール製造用電気炉から出湯され
た溶融スラグを、繊維化装置に導く角度調整自在の出湯
樋に誘導加熱装置を設けたことを特徴とするスラグウー
ル製造用電気炉出湯樋の加熱装置。1. An electric furnace outlet sluice for slag wool production, characterized in that an induction heating device is provided in a tap sluice with an adjustable angle for guiding molten slag discharged from an electric furnace for slag wool production to a fiberizing device. Heating device.
JP17192392A 1992-06-04 1992-06-04 Heater for tapping spout of electric furnace for production of slag wool Pending JPH05339023A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17192392A JPH05339023A (en) 1992-06-04 1992-06-04 Heater for tapping spout of electric furnace for production of slag wool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17192392A JPH05339023A (en) 1992-06-04 1992-06-04 Heater for tapping spout of electric furnace for production of slag wool

Publications (1)

Publication Number Publication Date
JPH05339023A true JPH05339023A (en) 1993-12-21

Family

ID=15932359

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17192392A Pending JPH05339023A (en) 1992-06-04 1992-06-04 Heater for tapping spout of electric furnace for production of slag wool

Country Status (1)

Country Link
JP (1) JPH05339023A (en)

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