EP0131668B1 - Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke - Google Patents

Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke Download PDF

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Publication number
EP0131668B1
EP0131668B1 EP83401447A EP83401447A EP0131668B1 EP 0131668 B1 EP0131668 B1 EP 0131668B1 EP 83401447 A EP83401447 A EP 83401447A EP 83401447 A EP83401447 A EP 83401447A EP 0131668 B1 EP0131668 B1 EP 0131668B1
Authority
EP
European Patent Office
Prior art keywords
slag
flow
liquid
high pressure
droplets
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.)
Expired
Application number
EP83401447A
Other languages
English (en)
French (fr)
Other versions
EP0131668A1 (de
Inventor
Pierre Vameck
Georges Bruyere
Jean-Marie Gaillard
Patrick Leonard
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.)
Industrielle De Recuperation Metallurgique Cirm Cie
Original Assignee
Industrielle De Recuperation Metallurgique Cirm Cie
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 Industrielle De Recuperation Metallurgique Cirm Cie filed Critical Industrielle De Recuperation Metallurgique Cirm Cie
Priority to EP83401447A priority Critical patent/EP0131668B1/de
Priority to AT83401447T priority patent/ATE25465T1/de
Priority to DE8383401447T priority patent/DE3369793D1/de
Priority to KR1019830003774A priority patent/KR840005491A/ko
Priority to JP58195397A priority patent/JPS6025538A/ja
Publication of EP0131668A1 publication Critical patent/EP0131668A1/de
Application granted granted Critical
Publication of EP0131668B1 publication Critical patent/EP0131668B1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • 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
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • 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
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag

Definitions

  • the present invention relates to a process for obtaining aggregates from steelworks slag, in particular from L.D steelworks.
  • US Patent 4,218,201 describes a process for granulating blast furnace slag by blowing air on a stream of liquid slag, using high air flow rates: 500 m 3 / tonne or more, at relatively low speeds. : 50 to 140 m / sec. This document does not recommend higher speeds in particular for the reason that higher speeds lead to the formation of wool, which must then be separated.
  • the present invention has as its starting point the unexpected discovery that, under certain very precise conditions, the sending of jets of compressed air under high pressure, that is to say at high speed, makes it possible to obtain rounded granules . It is likely that research in this direction has hitherto been discouraged by the high price of compressed air under high pressure, but progress in this area has reduced this obstacle.
  • the object of the invention is therefore to provide a process for obtaining steel slag aggregates according to which the dispersion of the jet of liquid material is obtained neither by the action of water nor in a mechanical manner involving contact liquid with a solid surface.
  • the present invention therefore provides a process for obtaining aggregates from steel slag, in which a liquid stream of slag is dispersed to form droplets, then these droplets are solidified by cooling using jets of cold gas.
  • a liquid stream of slag is dispersed to form droplets, then these droplets are solidified by cooling using jets of cold gas.
  • the liquid current is dispersed using jets of compressed gas under pressure greater than 10 bars (10 6 Pa) directed towards a flow of liquid slag with a thickness of between 10 and 50 millimeters , the compressed air jets making with said flow an angle of at least 40 °.
  • the device illustrated in the figure and which is intended for the granulation of slag from LD steelworks, comprises a liquid slag tank 1, which has at its base an opening 2, provided with an adjustable register, and which makes it possible to send the liquid material in a chute 3, made of refractory material.
  • the bottom of this chute is flat, 40 cm wide, and is inclined to the horizontal by about 40 °. So that with the slag used one can obtain a flow of 2 to 3 tonnes per minute, the sheet of liquid having a thickness of 2 to 3 cm, which corresponds to a flow speed which can be of the order 100 meters per minute.
  • the chute 3 ends with a horizontal edge 4, and at a short distance therefrom, under the chute, are arranged two horizontal injection ramps, 5, 6 each formed by a cylindrical tube on a generator of which are mounted a series of injectors 7, 8.
  • the injectors are provided with elongated nozzles, which provide a flattened air jet, and the nozzles are arranged with the major axis of their nozzles in the same plane, so that at a certain distance from the ramp, a single continuous layer of air is obtained for each ramp. Specifically, with don nozzles nant a 60 ° spread jet, a continuous ply is obtained approximately 50 mm from the boom if the distance between the nozzles is 50 mm. If the sprinklers give a 30 ° spread jet, the continuous sheet is obtained at a distance almost double. The size of the nozzles is 2 to 3 mm.
  • the two ramps are adjustable in position and in direction, and they are arranged so that the liquid flow is reached by the air emitted by each ramp at the moment when this air has formed a continuous sheet.
  • the directions of the sheets emitted by the two ramps converge at a point A which is a few centimeters above the liquid flow, or more precisely, the position that the flow of liquid would reach if the injection ramps were arrested. Point A is a few centimeters beyond the edge 4 of the chute.
  • the angle made by the direction of the compressed air layers with the liquid is adjustable, as we have said. It was found that good results were obtained with one of the ramps making an angle of 70 ° to 90 ° with the direction of flow of the liquid, and the other making an angle of 90 to 110 ° with the same direction of flow .
  • the ramps 5, 6 are connected to a source of compressed air under high pressure, approximately 16 bars (16 ⁇ 10 5 Pa) providing a flow rate greater than 20 Nm 3 / minute.
  • nozzles 9 are arranged in the vicinity of the end of the chute. These nozzles are directed not on the flow of the liquid, but on the jet of droplets 10 formed by the action of the ramps 5 and 6.
  • These nozzles 9 are connected to a source of compressed air at relatively low pressure, such as that supplied by the factory compressed air network, 4 to 5 bars (4,105 to 5,105 Pa) for example, but it leaves at high flow rate.
  • Their role is to carry away (10 to 15 meters for example) the slag droplets in the process of solidification or already solidified so as to avoid a heap near the spraying installation. They also, of course, have a role in cooling the product.
  • the compressed air can be replaced by pure water vapor, or by nitrogen which can be found in large quantities near an installation for the separation of gases from the air associated with an oxygen steelworks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture Of Iron (AREA)
  • Glanulating (AREA)

Claims (6)

1. Verfahren zur Herstellung von Granulaten aus Stahlwerkschlacke, bei dem man einen flüssigen Schlackenstrom dispergiert, um Tröpfchen zu bilden, dann die Tröpfchen durch Abkühlen mit Hilfe von kalten Gasstrahlen, die mit dem Ausfluß einen Winkel von mindestens 40° und vorzugsweise zwischen 70 und 110° bilden, verfestigt, dadurch gekennzeichnet, daß man die Dispersion des flüssigen Stromes mit Hilfe von Strahlen eines auf einen Druck über 10 bar (106 Pa) komprimierten Gases behandelt, die gegen einen Ausfluß von flüssiger Schlacke mit einer Dicke zwischen 10 und 50 mm gerichtet sind.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Hochdruck-Gasstrahlen so angeordnet sind, daß sie einen kontinuierlichen flächigen Gasstrom von hoher Geschwindigkeit bilden, der auf den Ausfluß von flüssiger Schlacke auftrifft.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man nach dem Dispergieren des flüssigen Stroms mit Hilfe von Hochdruckgas die verfestigten oder sich verfestigenden Tröpfchen mit Hilfe eines bedeutenden Durchsatzes an Niederdruckgas zu einer Auffangfläche oder einem Auffangraum transportiert.
4. Verfahren nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß das verwendete Hochdruckgas mit 16 bis 32 bar (16 x 105 bis 32 x 105 Pa) und einem Mindestdurchsatz von 20 Nm3/min zugeführt wird.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Hochdruckgas Druckluft ist.
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Hochdruckgas Stickstoff ist.
EP83401447A 1983-07-12 1983-07-12 Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke Expired EP0131668B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP83401447A EP0131668B1 (de) 1983-07-12 1983-07-12 Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke
AT83401447T ATE25465T1 (de) 1983-07-12 1983-07-12 Verfahren zum herstellen von granulaten aus stahlwerkschlacke.
DE8383401447T DE3369793D1 (en) 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag
KR1019830003774A KR840005491A (ko) 1983-07-12 1983-08-12 제철소 슬래그의 입상화 방법
JP58195397A JPS6025538A (ja) 1983-07-12 1983-10-20 製鋼スラグ砕片の製造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83401447A EP0131668B1 (de) 1983-07-12 1983-07-12 Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke

Publications (2)

Publication Number Publication Date
EP0131668A1 EP0131668A1 (de) 1985-01-23
EP0131668B1 true EP0131668B1 (de) 1987-02-11

Family

ID=8191420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401447A Expired EP0131668B1 (de) 1983-07-12 1983-07-12 Verfahren zum Herstellen von Granulaten aus Stahlwerkschlacke

Country Status (5)

Country Link
EP (1) EP0131668B1 (de)
JP (1) JPS6025538A (de)
KR (1) KR840005491A (de)
AT (1) ATE25465T1 (de)
DE (1) DE3369793D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409235B (de) * 1999-01-19 2002-06-25 Boehler Edelstahl Verfahren und vorrichtung zur herstellung von metallpulver

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407841B (de) * 1999-08-27 2001-06-25 Holderbank Financ Glarus Vorrichtung zum granulieren und zerkleinern von flüssigen schlacken oder schaumschlacken
BR9905656A (pt) * 1999-11-30 2001-07-24 Viviane Vasconcelos Vilela Ltd Aparelhagem e processo para a extração de calor e para a solidificação de partìculas de materiais fundidos
DE10326952B4 (de) * 2003-06-05 2006-04-20 Yerihemzon-Logvynskyi, Leonid, Dr. Verfahren und Vorrichtung zur Granulation flüssiger Schlacken
CN102851416B (zh) * 2012-09-24 2015-11-04 四川环能德美科技股份有限公司 一种处理高炉熔渣热能回收方法
CN102851415B (zh) * 2012-09-24 2015-04-15 四川环能德美科技股份有限公司 一种高炉熔渣热能回收系统
CN106269173B (zh) * 2016-10-09 2018-06-12 攀钢集团攀枝花钢铁研究院有限公司 一种碳化渣的粉碎方法
CN108165688B (zh) * 2018-01-16 2019-08-06 江苏省镔鑫钢铁集团有限公司 一种冶金炉渣烘焦系统
CN109943673B (zh) * 2019-03-22 2021-10-29 北京硕人节能环保技术有限公司 一种冶炼熔融渣风雾双流体粒化处理工艺和装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR387218A (fr) * 1908-02-13 1908-07-03 El (Brevete) Et Ses Applications Industrielles Procédé et appareils pour granuler le laitier
FR83190E (fr) * 1963-03-05 1964-06-26 Siderurgie Fse Inst Rech Dispositif de granulation de laitier métallurgique
US4218201A (en) * 1978-07-25 1980-08-19 Nippon Steel Corporation Apparatus for producing solidified granular slag from molten blast furnace slag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409235B (de) * 1999-01-19 2002-06-25 Boehler Edelstahl Verfahren und vorrichtung zur herstellung von metallpulver

Also Published As

Publication number Publication date
DE3369793D1 (en) 1987-03-19
KR840005491A (ko) 1984-11-14
ATE25465T1 (de) 1987-02-15
EP0131668A1 (de) 1985-01-23
JPS6025538A (ja) 1985-02-08

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