WO2014041418A2 - Appareil et procédé pour traiter un laitier métallurgique - Google Patents

Appareil et procédé pour traiter un laitier métallurgique Download PDF

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Publication number
WO2014041418A2
WO2014041418A2 PCT/IB2013/002000 IB2013002000W WO2014041418A2 WO 2014041418 A2 WO2014041418 A2 WO 2014041418A2 IB 2013002000 W IB2013002000 W IB 2013002000W WO 2014041418 A2 WO2014041418 A2 WO 2014041418A2
Authority
WO
WIPO (PCT)
Prior art keywords
slag
additives
exit
stream
inertization
Prior art date
Application number
PCT/IB2013/002000
Other languages
English (en)
Other versions
WO2014041418A3 (fr
Inventor
Alessandra Primavera
Laura SOLDI
Marco Ansoldi
Original Assignee
Danieli & C. Officine Meccaniche Spa
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 Danieli & C. Officine Meccaniche Spa filed Critical Danieli & C. Officine Meccaniche Spa
Priority to MX2015003236A priority Critical patent/MX2015003236A/es
Priority to RU2015112156A priority patent/RU2625352C2/ru
Publication of WO2014041418A2 publication Critical patent/WO2014041418A2/fr
Publication of WO2014041418A3 publication Critical patent/WO2014041418A3/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • the present invention concerns a method and an apparatus for processing metallurgic slag and making it inert, in particular slag arriving from a steel production plant, for example a melting furnace.
  • the slag has the function of protecting the liquid bath from oxidation or external contamination, of insulating it thermally so as to prevent unwanted cooling, and also of capturing the unwanted elements in the steel, in particular metals and impurities such as sulfur and phosphorus.
  • Slag is substantially a mixture of oxides and has a variable composition depending on the type of steel produced, on the operational requirements and on the management of the melting process.
  • the slag is periodically removed from the melting furnace by means of a deslagging operation, which consists of pouring the slag from an aperture made for the purpose in the shell of the melting furnace and called deslagging door.
  • the slag discharged from the melting furnace is normally collected in a container below.
  • sand or more generally materials containing silica (SiO 2 ), for example various types of silicates, quartz or metamorphic rocks, are used as additives to be added to the slag to obtain mechanically and chemically stable compounds, that is, inert.
  • SiO 2 silica
  • quartz or metamorphic rocks are used as additives to be added to the slag to obtain mechanically and chemically stable compounds, that is, inert.
  • additives allow to vitrify the slag, incorporating the metal cations present in the slag in a vitreous matrix, limiting its mobility and hence its chemical reactivity, and hence preventing the elution or separation of the heavy metals.
  • the additives also have the function of stabilizing the slag mechanically, reducing the quantity of free lime and hence limiting the tendency to mechanical modifications over time.
  • Methods are known for processing metallurgic slag, the purpose of which is to make the slag inert by exploiting its affinity with basic oxides such as CaO, and the reactivity of the silicate derivatives at high temperatures in forming vitreous structures and/or adding to the slag inertization additives able to incorporate heavy metals in crystalline structures.
  • Apparatuses which add additives to the slag through gravity, from above. These apparatuses obtain a method that provides to add the additives continuously during the deslagging step.
  • Another disadvantage is that the additives are distributed unevenly in the slag, affecting the stream of slag only superficially and not penetrating sufficiently inside, so that some zones of the slag are not transformed as desired.
  • Another known method for the stabilization or inertization of slag comprises a step of adding inertization additives, again through gravity, but discontinuously and in a step immediately after the deslagging step.
  • This method also provides subsequent processing operations by administering gas and carbon inside a receptacle containing the slag and kept at an average temperature of about 1400°C.
  • Document FR 2.752.243 Al describes a method for slag inertization in which the additives are injected by means of a pneumatic injector into a stream of slag in a position upstream of the turbulence caused by the liquid jet arriving in the collection container, or caused by specific perturbation elements disposed along the fall trajectory, in order to exploit the turbulence so as to improve the homogenization of the compound.
  • This document deals with mechanical stabilization by reducing the quantity of free lime.
  • this patent application provides to inject a quantity of 0.5 ⁇ 1.5 tonnes of additives for 10-20 tonnes of slag, or 50 ⁇ 150 kg/t(slag). This quantity allows to obtain only a reduction in the concentration of free lime, but not the inertization of the heavy metals. Since the document does not teach to chemically stabilize the slag, preventing the elution of the heavy metals, it cannot be used for the production of slag that can be reused in the production of steel alloys.
  • Document WO 01/20047 concerns the injection of additives into molten steel, inside the furnace or when it is poured outside, and not the inertization of the slag as it is unloaded.
  • One purpose of the present invention is to obtain a method and perfect an apparatus for processing slag arriving from a melting furnace that is efficient in rendering the slag inert and that allows to limit as much as possible the loss of additives.
  • Another purpose of the present invention is to allow to obtain, after the slag has been processed, a uniformly stabilized and homogeneous product.
  • Another purpose of the present invention is to obtain a method and an apparatus that are versatile and effective, irrespective of the type or conditions of the slag processed.
  • thermogenic agents necessary to promote the mixing of the slag and additives, which could influence the mechanical properties of the product, in the event of non-total oxidation, and which in any case increase the overall cost of the process.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a method and apparatus for processing metallurgic slag according to the present invention are used to render inert the slag arriving from a steel production plant, such as a melting furnace, for example an electric furnace or an induction furnace.
  • the latter has at least one melting chamber and a deslagging aperture from which a stream of slag exits from the melting chamber toward a collection point below, normally a container disposed at a vertical distance of at least 5 meters, advantageously between 5 and 10 meters, with respect to the position of the deslagging aperture.
  • pneumatic feed means are used, connected to at least one tank containing inertization additives.
  • the pneumatic means comprise at least a pump, or other analogous or comparable mean.
  • the pneumatic feed means are connected to a tubular injector, for example a lance, and with the at least one tank, so as to transfer the inertization additives from the tank toward an exit end of the tubular injector, where there are one or more exit nozzles, projecting them into the stream of slag with a desired kinetic energy.
  • a tubular injector for example a lance
  • the at least one tank so as to transfer the inertization additives from the tank toward an exit end of the tubular injector, where there are one or more exit nozzles, projecting them into the stream of slag with a desired kinetic energy.
  • the exit of the additives injector is positioned so that the stream of additives hits the slag at a height, measured vertically with respect to the exit point of the slag from the steel production plant, less than or equal to 3 m, preferably less than or equal to about 1.5 m.
  • the container where the slag is collected when discharged from the steel production plant is normally at a height of more than 5 meters, normally as much as 10 meters from the point of exit of the slag - additives and slag have the space and time to aggregate and mix dynamically, during their fall, before being collected in the container below.
  • Directing the jet of additives at a vertical distance of less than 3 meters with respect to the exit point of the slag also has the purpose of preventing the powders from being dispersed due to suction from the deslagging door if they are too close to said door.
  • its purpose is to perform the pneumatic feed of the additives in a zone that is sufficiently near the exit of the furnace, so that the slag is at a temperature of at least 1200°C, advantageously at least 1300°C and even more advantageously at least 1400°C; in this way the melting of the additives, and their mixing with the slag, and the generation of stable steps to elution is promoted.
  • thermogenic agents which would not only cause an increase in costs but could also compromise the characteristics of the slag and the homogeneity of the process.
  • the exit nozzle is advantageously inclined, with respect to the horizontal direction, by a determinate angle comprised between -45° and 45°, thus allowing to reduce dustiness in the mixing of the additives and slag.
  • the pneumatic feed means project the inertization additives into the slag at a speed comprised between 3 m/s and 50 m/s, and at a pressure comprised between 0.3 bar and 6 bar.
  • the pneumatic feed means project into the slag a quantity of inertization additives comprised between about 5% and about 50% in weight of the slag, preferably between about 10% and about 30%.
  • the present invention advantageously allows to modulate, by means of the pneumatic feed means, the characteristics of the stream of inertization additives and to calibrate the stream according to requirements correlated to the specific stream of slag.
  • a command and control unit cooperates with the pneumatic feed means in order to regulate the pressure and/or speed at which the inertization additives exit from the one or more exit nozzles.
  • the command and control unit is also able to regulate the quantity of inertization additives projected into the stream of slag. If the pneumatic feed means are connected to more than one tank, the command and control unit also allows to vary the type of inertization additives projected into the slag.
  • the regulations described above are carried out manually by an operator.
  • the projection of the inertization additives into the stream of slag is performed continuously during at least most of the deslagging step.
  • the projection of the inertization additives is performed discontinuously during at least most of the deslagging step.
  • FIG. 1 is a schematic view of an apparatus according to the present invention.
  • an apparatus 10 for processing metallurgic slag is associated to a melting furnace 1 1, for example an electric furnace or an induction furnace, and cooperates with the latter to process the slag.
  • the melting furnace 11 comprises a melting chamber 13, inside which a liquid bath of steel 14 is covered by a layer of slag 12.
  • the melting chamber 13 communicates with the outside through a deslagging aperture 15, which is normally closed during the melting process by a deslagging door 16.
  • the deslagging door 16 is opened and the melting furnace 1 1 inclined so as to pour the slag 12 outside the melting chamber 13 through the deslagging aperture 15.
  • the melting furnace 11 integrates, or is associated to, means to discharge the slag 12 which allow the slag 12 to exit from the melting chamber 13 without inclining the furnace 11.
  • the slag 12 falls through gravity to a collection point below (fig. 1), which can be for example a container 17 and which is distant by some meters, generally between 5 m and 10 m, from a reference level L defined by the lower end or threshold of the deslagging aperture 15 from which the slag 12 exits.
  • a collection point below can be for example a container 17 and which is distant by some meters, generally between 5 m and 10 m, from a reference level L defined by the lower end or threshold of the deslagging aperture 15 from which the slag 12 exits.
  • the apparatus 10 comprises an elongated tubular element, injector or lance 18, which can have any cross section and also has, at one end, at least one exit nozzle 19.
  • Pneumatic feed means 20, for example a pump, are connected to a tank 21 containing inertization additives 22 and with the lance 18, to transfer the inertization additives 22 from the tank 21 to outside the exit nozzle 19.
  • the inertization additives 22, the function of which is to stabilize or render the slag 12 inert, are contained in the tank 21 in the form of sand or powder.
  • inertization additives 22 are comprised geological sands, pure oxides (SiO 2 , MgO, Al 2 O 3 , FeO n , K 2 O, Na 2 O), phosphatic sands, sulphates, each component being usable in itself or mixed with one or more of the other components cited. Salts can also be used s inertization additives 22, which when decomposed lead to materials among those cited.
  • the pneumatic feed means 20 are configured to pick up the inertization additives 22 from the tank 21 and confer upon them sufficient kinetic energy to exit from the exit nozzle 19 and impact upon the slag 12 with a desired speed, depending on the conformation of the stream of slag 12.
  • the kinetic energy supplied to the inertization additives 22 also functions as an accelerator for the chemical reactions that are generated after contact between the additives and the slag 12 and their reciprocal mixing.
  • the pneumatic feed means 20 are able to confer on the inertization additives 22 an exit speed comprised between 3 m/s and 50 m/s, at a pressure comprised between 0.3 bar and 6 bar, so that they are able to penetrate into the stream of slag 12.
  • the positioning of the lance 18 provides that the distance H, measured vertically, between the point of impact P of the inertization additives 22 on the slag 12 and the reference level L of the threshold of the deslagging aperture 15 is less than or equal to 3 m, preferably less than or equal to about 1.5 m.
  • the apparatus 10 projects the inertization additives 22 against the slag 12 in a selectively continuous or discontinuous manner, in a projection step simultaneous with the whole deslagging step.
  • the quantity of inertization additives 22 projected into the slag 12 can be regulated depending on the type and stream of slag 12, and is managed by a command and control unit 23. This cooperates with the pneumatic feed means 20 and allows to obtain a stream of inertization additives 22 comprised between 5% and 50% in weight, or between about 10% and about 30% in weight, of the stream of slag 12 exiting from the melting furnace 11, corresponding to a quantity of additives comprised between 50 ⁇ 500 kg/t(slag).
  • This percentage of additives also allows to obtain, together with the reduction in the free lime, an effect of inertization of the heavy metals, and does not require particular compositions of the metal.
  • the command and control unit 23 is also able to regulate the exit pressure and speed conferred on the inertization additives 22, so as to make the inertization method according to the present invention more flexible.
  • a protection element 24 is provided, made of refractory material, associated to the exit nozzle 19 and having the function of protecting the exit nozzle 19 from possible splashes of material arriving from the stream of slag 12 that could damage it or obstruct it.
  • the variant solution shown in fig. 2 differs from the previous one because the exit nozzle 19 is inclined with respect to the horizontal position by an angle a comprised between -45° and 45°.
  • the point of impact P of the inertization additives 22 and the slag 12 remains in any case advantageously below the exit mouth of the exit nozzle 19, to reduce to a minimum the dust caused by mixing.
  • a first movement device in this case a manipulator 25, cooperates with the lance 18 both to direct the exit nozzle 19 on a horizontal plane, providing a translation or an angular movement, and also to incline it on a vertical plane according " to an angle a that is selectively variable.
  • the manipulator 25, which can be maneuvered manually by an operator or connected to the command and control unit 23 for remote or automatic control, allows to move the jet of inertization additives 22 so as to follow the variations in the stream of slag 12.
  • the exit nozzle 19 is positioned inside the stream of slag 12.
  • a second movement device 26 is associated to the lance 18 and makes it mobile with a movement toward and away from (arrow F) the stream of slag 12.
  • the movement device 26 cooperates with a detection device 27 and with the command and control unit 23.
  • the detection device 27 which can be for example a temperature sensor, has the function of evaluating, in real time and continuously, by how much the stream of slag 12 detaches from the melting furnace 1 1, and to transmit a signal coherent with this evaluation to the command and control unit 23. Having processed the signal, the command and control unit 23 commands the second movement device 26 to keep the exit nozzle 19 constantly at a desired distance from the slag 12, or inside the stream of slag 12.
  • the exit nozzle 19 is made of material with a melting temperature higher than the temperature of the slag, and resistant to wear.
  • Another material can also be used, for example a copper alloy, provided it is suitably cooled.
  • the exit nozzle 19 is replaceable, and can be shaped so as to have an exit mouth conformed as shown by way of example in figs. 5-7.
  • the exit nozzle 19 with a circular section as shown in fig. 5 lends itself to solutions with low speed, high pressure and considerable quantities of inertization additives 22.
  • the exit nozzle 119 with a flat cross section as shown in fig. 6 is used for higher speeds and to exploit a greater lateral extension.
  • the exit nozzle 219 in fig. 7, with multiple exits, allows to direct the inertization additives 22 onto the slag 12 in several directions simultaneously.
  • This plurality of exit nozzles 19, 1 19, 219, for example disposed in a horizontal direction, can promote an easier cover of the whole width of the stream of slag 12.
  • a plurality of exit nozzles 19, 119, 219 disposed vertically can promote a regulation of the total flow rate through several injection points.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Details (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

L'invention porte sur un appareil pour traiter un laitier métallurgique, lequel appareil est associé à un four de fusion (11) ayant au moins une chambre de fusion (13) et une ouverture de décrassage (15) à partir de laquelle un courant de laitier (12) sort vers un point de collecte en dessous, et lequel comprend un élément tubulaire (18) ayant une extrémité de sortie, et des moyens d'alimentation pneumatiques (20), coopérant avec au moins un réservoir (21) contenant des additifs d'inertisation (22). Les moyens d'alimentation pneumatiques (20) coopèrent avec l'élément tubulaire (18) et avec le réservoir (21) pour transférer les additifs d'inertisation (22) à partir du réservoir (21) vers l'extérieur de l'extrémité de sortie dudit élément tubulaire (18), où il y a au moins une buse de sortie (19, 119, 219) pour projeter les additifs d'inertisation (22) dans le courant de laitier (12) avec une énergie cinétique désirée.
PCT/IB2013/002000 2012-09-13 2013-09-13 Appareil et procédé pour traiter un laitier métallurgique WO2014041418A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
MX2015003236A MX2015003236A (es) 2012-09-13 2013-09-13 Método y aparato para el procesamiento de escoria metalúrgica.
RU2015112156A RU2625352C2 (ru) 2012-09-13 2013-09-13 Способ и устройство для переработки металлургического шлака

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD2012A000158 2012-09-13
IT000158A ITUD20120158A1 (it) 2012-09-13 2012-09-13 Apparato e metodo per il trattamento di scorie metallurgiche

Publications (2)

Publication Number Publication Date
WO2014041418A2 true WO2014041418A2 (fr) 2014-03-20
WO2014041418A3 WO2014041418A3 (fr) 2014-09-12

Family

ID=47190053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/002000 WO2014041418A2 (fr) 2012-09-13 2013-09-13 Appareil et procédé pour traiter un laitier métallurgique

Country Status (5)

Country Link
KR (1) KR20150084789A (fr)
IT (1) ITUD20120158A1 (fr)
MX (1) MX2015003236A (fr)
RU (1) RU2625352C2 (fr)
WO (1) WO2014041418A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022021235A (ja) * 2020-07-21 2022-02-02 Ｊｆｅスチール株式会社 改質転炉スラグの製造方法、および道路路盤材用粒状材の製造方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102113387B1 (ko) * 2018-02-12 2020-05-20 (주)유진에코씨엘 분사위치가 조절되는 분사노즐이 구비된 제강슬래그용 퀀칭 시스템
CN110564976B (zh) * 2019-10-17 2021-05-14 大冶有色金属有限责任公司 澳斯麦特炉喷枪枪重自动脱落的工艺方法
CN112125554B (zh) * 2020-09-29 2021-12-21 江苏奥纳麦格科技有限公司 流动式珍珠岩膨胀炉燃烧机的助燃装置

Citations (2)

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Publication number Priority date Publication date Assignee Title
FR2752243A1 (fr) 1996-08-08 1998-02-13 Lorraine Laminage Procede de preparation de granulats a partir de laitier liquide d'acierie
WO2001020047A1 (fr) 1999-09-16 2001-03-22 Qual-Chem Limited Procede d'introduction d'additifs dans l'elaboration de l'acier

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Publication number Priority date Publication date Assignee Title
JPS5123420A (en) * 1974-06-07 1976-02-25 Nippon Steel Corp Shutsukochuyokoheno tenkazaitonyusochi
AT345491B (de) * 1976-12-10 1978-09-25 Voest Ag Einrichtung zur zugabe von zusatzstoffen in einen metallgiessstrahl
SU1574636A1 (ru) * 1987-10-05 1990-06-30 Донецкий научно-исследовательский институт черной металлургии Способ сухой гранул ции шлаков
LU91108B1 (en) * 2004-10-04 2006-04-05 Wurth Paul Sa System and method for injecting gas-powder mixtureinto slag
IT1401859B1 (it) * 2010-09-06 2013-08-28 Feralpi Siderurgica S P A Metodo e impianto per il trattamento di scorie metallurgiche

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2752243A1 (fr) 1996-08-08 1998-02-13 Lorraine Laminage Procede de preparation de granulats a partir de laitier liquide d'acierie
WO2001020047A1 (fr) 1999-09-16 2001-03-22 Qual-Chem Limited Procede d'introduction d'additifs dans l'elaboration de l'acier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022021235A (ja) * 2020-07-21 2022-02-02 Ｊｆｅスチール株式会社 改質転炉スラグの製造方法、および道路路盤材用粒状材の製造方法
JP7310745B2 (ja) 2020-07-21 2023-07-19 Ｊｆｅスチール株式会社 改質転炉スラグの製造方法、および道路路盤材用粒状材の製造方法

Also Published As

Publication number Publication date
WO2014041418A3 (fr) 2014-09-12
ITUD20120158A1 (it) 2014-03-14
RU2015112156A (ru) 2016-11-10
KR20150084789A (ko) 2015-07-22
RU2625352C2 (ru) 2017-07-13
MX2015003236A (es) 2015-09-29

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