EP0131668B1 - Process for obtaining granules from steelwork slag - Google Patents

Process for obtaining granules from steelwork slag 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
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EP
European Patent Office
Prior art keywords
slag
flow
liquid
high pressure
droplets
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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
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German (de)
French (fr)
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EP0131668A1 (en
Inventor
Pierre Vameck
Georges Bruyere
Jean-Marie Gaillard
Patrick Leonard
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Industrielle De Recuperation Metallurgique Cirm Cie
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Industrielle De Recuperation Metallurgique Cirm Cie
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Application filed by Industrielle De Recuperation Metallurgique Cirm Cie filed Critical Industrielle De Recuperation Metallurgique Cirm Cie
Priority to EP83401447A priority Critical patent/EP0131668B1/en
Priority to DE8383401447T priority patent/DE3369793D1/en
Priority to AT83401447T priority patent/ATE25465T1/en
Priority to KR1019830003774A priority patent/KR840005491A/en
Priority to JP58195397A priority patent/JPS6025538A/en
Publication of EP0131668A1 publication Critical patent/EP0131668A1/en
Application granted granted Critical
Publication of EP0131668B1 publication Critical patent/EP0131668B1/en
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    • 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

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  • 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)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture Of Iron (AREA)
  • Glanulating (AREA)

Abstract

1. Process for obtaining granules from steelwork slag, in which a liquid stream of slag is dispersed to form droplets, these droplets are then solidified by cooling using cold gas jets, forming, with the said flow, an angle of at least 40 degrees and preferably between 70 and 110 degrees, characterized in that the dispersion of the liquid stream is carried out using compressed gas jets at a pressure greater than 10 bars (10**6 Pa) directed towards a flow of liquid slag of a thickness of between 10 and 50 millimetres.

Description

La présente invention est relative à un procédé d'obtention de granulats à partir de scorie d'aciérie, en particulier d'aciérie L. D.The present invention relates to a process for obtaining aggregates from steelworks slag, in particular from L.D steelworks.

Dans le passé la granulation de la scorie d'aciérie se faisait à l'eau : on coupait un jet de scorie liquide avec un écran d'eau à haute pression, et les granules tombaient dans un bassin rempli d'eau.In the past the granulation of the steel slag was done with water: a jet of liquid slag was cut with a screen of high pressure water, and the granules fell into a basin filled with water.

Cette manière de faire a aboutit à des accidents dus à des explosions qui résultaient de la décomposition de l'eau par du métal en fusion mêlé occasionnellement à la scorie. Divers procédés ont été proposés pour séparer le métal de la scorie et éviter le renouvellement de ces accidents, mais on préfère actuellement s'orienter vers des solutions utilisant d'autres moyens que l'eau pour le refroidissement de la scorie liquide, et en particulier l'air.This resulted in accidents due to explosions which resulted from the decomposition of water by molten metal mixed occasionally with slag. Various methods have been proposed for separating the metal from the slag and preventing the recurrence of these accidents, but it is currently preferred to orientate towards solutions using means other than water for cooling the liquid slag, and in particular the air.

Cependant, alors que l'eau, quand elle reçoit un jet de scorie liquide agit d'abord pour disperser ce jet en gouttelettes et ensuite pour refroidir ces gouttelettes et les amener rapidement à l'état de gouttelettes solides, l'air comprimé, aux pressions habituellement utilisées, soit 3 à 8 bars, est incapable d'assurer la pression de ces fonctions, et le jet en général dispersé de façon mécanique, soit par projection du liquide à grande vitesse sur une surface solide rigide, soit en envoyant le liquide à vitesse plus faible sur une surface en déplacement rapide, par exemple un cylindre tournant à grande vitesse. Ces solutions posent des problèmes d'entretien et d'usure.However, while water, when it receives a jet of liquid slag acts first to disperse this jet into droplets and then to cool these droplets and quickly bring them to the state of solid droplets, the compressed air pressures usually used, 3 to 8 bars, is unable to ensure the pressure of these functions, and the jet generally dispersed mechanically, either by spraying the liquid at high speed on a rigid solid surface, or by sending the liquid at lower speed on a rapidly moving surface, for example a cylinder rotating at high speed. These solutions pose maintenance and wear problems.

Dans d'autres techniques, et en particulier dans la production de laine de laitier, on .sait qu'en envoyant de l'air à grande vitesse sur un écoulement de matière liquide, on forme à partir de celle-ci des filaments longs et fins, qui sont utilisés pour l'isolation.In other techniques, and in particular in the production of slag wool, it is known that by sending air at high speed over a flow of liquid material, long filaments are formed therefrom and purposes, which are used for insulation.

Le brevet US 4.218.201 décrit un procédé de granulation de laitier de haut fourneau par soufflage d'air sur un courant de laitier liquide, en utilisant des débits d'air importants : 500 m3/tonne ou plus, à des vitesses relativement faibles : 50 à 140 m/sec. Ce document déconseille des vitesses supérieures en particulier pour la raison que les vitesses plus grandes entraînent la formation de laine, qui doit ensuite être séparée.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.

La présente invention a pour point de départ la découverte inattendue que, sous certaines conditions bien précises, l'envoi de jets d'air comprimé sous forte pression, c'est-à-dire à grande vitesse, permet d'obtenir des granules arrondis. Il est vraisemblable que les recherches dans cette direction avaient jusqu'ici été découragées par le prix élevé de l'air comprimé sous forte pression, mais les progrès faits dans ce domaine ont réduit cet obstacle.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.

L'invention a donc pour but de fournir un procédé d'obtention de granulats de scorie d'aciérie selon lequel la dispersion du jet de matière liquide n'est obtenue ni par action de l'eau ni d'une manière mécanique impliquant un contact du liquide avec une surface solide.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.

La présente invention fournit donc un procédé d'obtention de granulats à partir de scorie d'aciérie, dans lequel on disperse un courant liquide de scorie pour former des gouttelettes, puis on solidifie ces gouttelettes par refroidissement à l'aide de jets de gaz froid qui présente la particularité qu'on opère la dispersion du courant liquide à l'aide de jets de gaz comprimé sous pression supérieure à 10 bars (106 Pa) dirigés vers un écoulement de scorie liquide d'une épaisseur comprise entre 10 et 50 millimètres, les jets d'air comprimé faisant avec ledit écoulement un angle d'au moins 40°.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. which has the particularity that 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 °.

Suivant les modalités préférées :

  • - les jets de gaz à haute pression sont disposes pour former une nappe continue de gaz à grande vitesse qui vient frapper l'écoulement de scorie liquide,
  • - les jets ou la nappe de gaz à haute pression font un angle compris entre 70 et 110° avec la direction de l'écoulement liquide,
  • - après avoir dispersé le courant liquide à l'aide du gaz à haute pression, on entraîne les gouttelettes solidifiées ou en cours de solidification vers une aire de réception à l'aide d'un débit important de gaz émis sous faible pression.
  • - le gaz à haute pression utilisé est envoyé sous 16 à 32 bars (16 105 à 32 105 Pa) avec un débit minimum de 20 Nm3/minute.
According to the preferred methods:
  • - the high pressure gas jets are arranged to form a continuous sheet of gas at high speed which strikes the flow of liquid slag,
  • - the jets or the sheet of high pressure gas make an angle between 70 and 110 ° with the direction of the liquid flow,
  • - After dispersing the liquid stream using the high pressure gas, the solidified droplets or those in the process of solidification are drawn towards a reception area using a large flow of gas emitted under low pressure.
  • - the high pressure gas used is sent at 16 to 32 bars (16 105 to 32 105 Pa) with a minimum flow rate of 20 Nm 3 / minute.

L'invention sera exposée plus en détail en s'aidant d'un exemple pratique, non limitatif, de réalisation conforme à l'invention, illustré par la figure unique, qui est une vue de côté très schématisée du dispositif pour la mise en oeuvre de l'invention.The invention will be explained in more detail with the aid of a practical, nonlimiting example of an embodiment in accordance with the invention, illustrated by the single figure, which is a very diagrammatic side view of the device for implementation. of the invention.

Le dispositif illustré à la figure et qui est destiné à la granulation de laitier d'aciérie L. D., comprend un réservoir à scorie liquide 1, qui présente à sa base une ouverture 2, pourvue d'un registre réglable, et qui permet d'envoyer la matière liquide dans une goulotte 3, en matière réfractaire. Le fond de cette goulotte est plat, d'une largeur de 40 cm, et elle est inclinée sur l'horizontale d'environ 40°. Si bien qu'avec la scorie utilisée on peut obtenir un écoulement de 2 à 3 tonnes par minute, la nappe de liquide ayant une épaisseur de 2 à 3 cm, ce qui correspond à une vitesse d'écoulement qui peut être de l'ordre de 100 mètres par minute.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.

La goulotte 3 se termine par un bord horizontal 4, et à faible distance de celui-ci, sous la goulotte, sont disposées deux rampes horizontales d'injection, 5, 6 formées chacune d'un tube cylindrique sur une génératrice duquel sont montés une série d'injecteurs 7, 8. Les injecteurs sont pourvus d'ajutages allongés, qui fournissent un jet d'air aplati, et les gicleurs sont disposés avec le grand axe de leurs ajutages dans le même plan, si bien qu'à une certaine distance de la rampe on obtient une nappe unique d'air continue pour chaque rampe. Plus précisément, avec des ajutages donnant un jet étalé de 60°, une nappe continue est obtenue à 50 mm environ de la rampe si l'écart entre les gicleurs est de 50 mm. Si les gicleurs donnent un jet étalé de 30°, la nappe continue est obtenue à une distance à peu près double. La dimension des gicleurs est de 2 à 3 mm.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.

Les deux rampes sont réglables en position et en direction, et on les dispose de façon que l'écoulement de liquide soit atteint par l'air émis par chaque rampe au moment où cet air a formé une nappe continue. Les directions des nappes émises par les deux rampes convergent en un point A qui est à quelques centimètres au-dessus de l'écoulement de liquide, ou plus précisément, de la position qu'atteindrait l'écoulement de liquide si les rampes d'injection étaient arrêtées. Le point A est à quelques centimètres au-delà du bord 4 de la goulotte. L'angle que fait la direction des nappes d'air comprimé avec le liquide est réglable, comme on l'a dit. On a constaté que de bons résultats étaient obtenus avec une des rampes faisant un angle de 70° à 90° avec la direction d'écoulement du liquide, et l'autre faisant un angle de 90 à 110° avec la même direction d'écoulement.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 .

Les rampes 5, 6 sont reliées à une source d'air comprimé sous forte pression, 16 bars (16 · 105 Pa) environ fournissant un débit supérieur à 20 Nm3/minute.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.

D'autres buses 9, dont une seule est représentée sont disposées au voisinage de l'extrémité de la goulotte. Ces buses sont dirigées non pas sur l'écoulement du liquide, mais sur le jet de gouttelettes 10 formé par l'action des rampes 5 et 6. Ces buses 9 sont reliées à une source d'air comprimé à pression relativement faible, telle que celle qui est fournie par le réseau d'air comprimé de' l'usine, 4 à 5 bars (4. 105 à 5.105 Pa) par exemple, mais elle sort à grand débit. Leur rôle est d'entraîner au loin (10 à 15 mètres par exemple) les gouttelettes de scorie en cours de solidification ou déjà solidifiées de façon à éviter un amoncellement à proximité de l'installation de pulvérisation. Elles ont aussi, bien entendu, un rôle dans le refroidissement du produit.Other nozzles 9, only one of which is shown 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.

Les essais effectués avec une scorie L. D. dont la composition en poids était la suivante, Fe total 18 %, CaO 46 %, MgO 7,5 %, MnO 5,5 %, P205 1,5 %, A1203 0,02 %, S 0,1 % ont abouti à la formation d'un granulat formé de billes de 0,15 à 5 mm, sphériques, pleines, vitrifiées en surfaces. Sous cette forme, la scorie d'aciérie présente de grandes facilités de manipulation, elle peut être recyclée dans l'usine, elle peut aussi être utilisée en cimenterie. Dans ce cas, elle peut être introduite directement dans le four de calcination, sans devoir passer dans le décarbonateur.The tests carried out with an LD slag whose composition by weight was as follows, total Fe 18%, CaO 46%, MgO 7.5%, MnO 5.5%, P 2 0 5 1.5%, A1 2 0 3 0.02%, S 0.1% resulted in the formation of an aggregate formed of 0.15 to 5 mm balls, spherical, solid, vitrified on the surfaces. In this form, the steel slag has great ease of handling, it can be recycled in the factory, it can also be used in cement works. In this case, it can be introduced directly into the calcination oven, without having to pass through the decarbonator.

L'invention peut être mise en oeuvre sous plusieurs variantes. En particulier, l'air comprimé peut être remplacé par de la vapeur d'eau pure, ou bien par de l'azote qu'on peut trouver en grande quantité à proximité d'une installation de séparation des gaz de l'air associé à une aciérie à l'oxygène.The invention can be implemented in several variants. In particular, 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.

Claims (6)

1. Process for obtaining granules from steel- work slag, in which a liquid stream of slag is dispersed to form droplets, these droplets are then solidified by cooling using cold gas jets, forming, with the said flow, an angle of at least 40° and preferably between 70 and 110°, characterized in that the dispersion of the liquid stream is carried out using compressed gas jets at a pressure greater than 10 bars (106 Pa) directed towards a flow of liquid slag of a thickness of between 10 and 50 millimetres.
2. Process according to claim 1, characterized in that the high pressure gas jets are arranged so as to form a continuous sheet of gas at high speed which comes to strike the flow of the liquid slag.
3. Process according to one of claims 1 or 2, characterized in that, after dispersing the liquid stream using high pressure gas, the droplets which are solidified or which are in the course of solidification are carried away towards a receiving area using a high flow rate of gas emitted at a low pressure.
4. Process according to one of claims 1 to 3, characterized in that the high pressure gas used is applied at 16 to 32 bars (16 105 to 32· 105 Pa), with a minimum flow rate of 20 Nm3/minute.
5. Process according to one of claims 1 to 4, characterized in that the high pressure gas is compressed air.
6. Process according to one of claims 1 to 4, characterized in that the high pressure gas is nitrogen.
EP83401447A 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag Expired EP0131668B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP83401447A EP0131668B1 (en) 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag
DE8383401447T DE3369793D1 (en) 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag
AT83401447T ATE25465T1 (en) 1983-07-12 1983-07-12 PROCESS FOR MANUFACTURING GRANULES FROM STEEL-WORKS SLAG.
KR1019830003774A KR840005491A (en) 1983-07-12 1983-08-12 Granulation method of steel mill slag
JP58195397A JPS6025538A (en) 1983-07-12 1983-10-20 Production of steel manufacturing slag piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83401447A EP0131668B1 (en) 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag

Publications (2)

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

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EP83401447A Expired EP0131668B1 (en) 1983-07-12 1983-07-12 Process for obtaining granules from steelwork slag

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EP (1) EP0131668B1 (en)
JP (1) JPS6025538A (en)
KR (1) KR840005491A (en)
AT (1) ATE25465T1 (en)
DE (1) DE3369793D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409235B (en) * 1999-01-19 2002-06-25 Boehler Edelstahl METHOD AND DEVICE FOR PRODUCING METAL POWDER

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407841B (en) * 1999-08-27 2001-06-25 Holderbank Financ Glarus DEVICE FOR GRANULATING AND CRUSHING LIQUID SLAG OR FOAM SLAG
BR9905656A (en) * 1999-11-30 2001-07-24 Viviane Vasconcelos Vilela Ltd Apparatus and process for the extraction of heat and for the solidification of particles of molten materials
DE10326952B4 (en) * 2003-06-05 2006-04-20 Yerihemzon-Logvynskyi, Leonid, Dr. Method and device for granulating liquid slags
CN102851416B (en) * 2012-09-24 2015-11-04 四川环能德美科技股份有限公司 A kind of process blast furnace slag heat energy recovering method
CN102851415B (en) * 2012-09-24 2015-04-15 四川环能德美科技股份有限公司 Recycling system of blast furnace slag heat
CN106269173B (en) * 2016-10-09 2018-06-12 攀钢集团攀枝花钢铁研究院有限公司 A kind of breaking method of carbide slag
CN108165688B (en) * 2018-01-16 2019-08-06 江苏省镔鑫钢铁集团有限公司 A kind of metallurgical slag adustion system
CN109943673B (en) * 2019-03-22 2021-10-29 北京硕人节能环保技术有限公司 Smelting molten slag air-fog double-fluid granulation treatment process and device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR387218A (en) * 1908-02-13 1908-07-03 El (Brevete) Et Ses Applications Industrielles Method and apparatus for granulating slag
FR83190E (en) * 1963-03-05 1964-06-26 Siderurgie Fse Inst Rech Metallurgical slag granulation device
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 (en) * 1999-01-19 2002-06-25 Boehler Edelstahl METHOD AND DEVICE FOR PRODUCING METAL POWDER

Also Published As

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JPS6025538A (en) 1985-02-08
ATE25465T1 (en) 1987-02-15
KR840005491A (en) 1984-11-14
DE3369793D1 (en) 1987-03-19
EP0131668A1 (en) 1985-01-23

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