[go: up one dir, main page]

WO2024127339A1 - Procédé et installation de traitement de laitier - Google Patents

Procédé et installation de traitement de laitier Download PDF

Info

Publication number
WO2024127339A1
WO2024127339A1 PCT/IB2023/062749 IB2023062749W WO2024127339A1 WO 2024127339 A1 WO2024127339 A1 WO 2024127339A1 IB 2023062749 W IB2023062749 W IB 2023062749W WO 2024127339 A1 WO2024127339 A1 WO 2024127339A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
steel
oxides
aluminium
iron
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.)
Ceased
Application number
PCT/IB2023/062749
Other languages
English (en)
Inventor
Alessandra Primavera
Selena TIBURZIO
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and 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 and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to CN202380085083.6A priority Critical patent/CN120359194A/zh
Priority to EP23837775.8A priority patent/EP4634127A1/fr
Publication of WO2024127339A1 publication Critical patent/WO2024127339A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • TITLE PROCESS AND PLANT FOR SLAG TREATMENT
  • the present invention refers to a process and a plant for the treatment of slag from steelmaking processes, in particular of slag coming from the production of steel by means of electric arc furnaces (EAF), so as to recover metals, ferroalloys and other materials from said slag that can be reused in the steelmaking process itself or in other product sectors.
  • EAF electric arc furnaces
  • Black slag therefore corresponds to the secondary product that is produced when the steel scraps, or the direct reduced iron, are melted to produce new steel, and consists of the oxides of the unwanted elements, such as silicon and phosphorus, or of the inevitable oxidation of iron and of the other alloying metals of steel, such as manganese in addition to the added slag formers, such as lime (CaO) and magnesia (MgO).
  • An electric arc furnace is a furnace that heats the material by means of an electric arc, combined with the action of the chemical energy provided by the use of oxygen and fuel.
  • the use of the electric arc furnaces allows producing steel starting from a raw material composed of up to 100% metal scraps, which allows to reduce the energy required for the production of steel compared to the primary production of steel from ferrous minerals.
  • the electric arc furnace is an equipment capable of melting different charge mixes, just like the scrap, but also direct reduced iron (DRT) and hot briquetted direct reduced iron (High Briquetted Iron, HBI).
  • the steel industry considers the slag remaining from this smelting process a by-product that can be disposed of in part by using it as a building material (for example as a thickness in road construction), considering that the harmonized European standards require mechanical strength and stability, compliance with hygiene, health and environmental requirements and safety in the use of these materials.
  • composition of the black slag is approximately: 47.7 % by weight of CaO, 19.6 % by weight of Fe x O y , 13.6 % by weight of SiCh, 5.8 % by weight of AI2O3, 5.3 % by weight of MnO, 3 % by weight of MgO, 0.96 % by weight of C CE, 0.5 % by weight of P2O5 e 0.46 % by weight of TiCh.
  • About 120 kg of black slag are produced per ton of steel tapped and therefore a steel mill with a productivity of 1 Mt/year also generates 120,000 t/year of black slag containing about 30,000 t of iron oxide and therefore 21,000 t of potentially recoverable metallic Iron.
  • the black slag can be used for road construction but this is not enough for the reuse of all the amount generated and there is a risk of having to landfill, for a fee, a material that still contains valuable components.
  • oxides in addition to iron oxide, may occasionally be present in the slag (such as Ba and V oxides) depending on the composition of the scrap and of the additives.
  • Ba, Cr and V can be sometimes responsible for elution problems that occur during the analysis of the slags: in fact, any calcium silicates present in the slag are soluble in water and responsible for the elution phenomenon.
  • the slag must be inert, that is, it must not give rise to the elution of Ba, Cr or V beyond the limits.
  • the invention aims to overcome the aforementioned drawbacks and to propose a process and a plant for valorizing the black slag, avoiding treating the slag only as waste or as a material of little value, but vice versa in order to be able to treat it as a real by-product of high added value.
  • a further object of the invention is the recovery of Iron and possibly of other alloying metals of steel from the slag.
  • Another object of the invention is to propose a process and a relative plant for treating the slag that transforms it into an inert slag easily usable in the cement industry.
  • a further object of the invention is to propose a process and plant to reduce the storage of slag produced between the various heats (melts) of an EAF. Another object of the invention is to reduce the heat input during slag treatment as much as possible.
  • the object is achieved by means of a process for the treatment of slag coming from the production of steel by means of electric arc furnaces, defined as starting slag, in particular black slag, comprising the following steps:
  • said starting slag comprising iron oxides (Fe x O y ) and preferably other oxides of alloying metals of steel, in particular chromium oxide (Cr x O y ), in particular in liquid form, with aluminium and/or silicon scrap;
  • step (iii) separation (a) of the Iron, and preferably of the other alloying metals of steel, and (P) of the treated slag with reduced iron oxide content, and preferably with reduced content of oxides of alloying metals of steel present in the slag, which incorporates said aluminium (AI2O3) and/or silicon (SiCh) oxides formed in step (ii); wherein the reaction of step (ii) occurs with still-liquid slag directly coming from the electric arc furnace, due to the exothermicity of the reaction itself and the heat provided by the stillliquid slag.
  • AI2O3 aluminium
  • SiCh silicon
  • the aforementioned exothermicity of the metallothermic reaction and the heat of the liquid slag ensure a high-temperature reaction, thus avoiding the need to have to provide additional external heat not derived from the same processes involved. It is therefore a passive slag treatment process; different from an active process, which would require in effect the additional active input of heat from outside.
  • the slag produced with this process is similar to the slag of the blast furnace and to the clinker and is an excellent material for the production of cement.
  • the process according to the invention is carried out in an online manner, that is, it is in shadow to the production of steel, according to the following mode,
  • step (i) the production of steel with the simultaneous production of slag by means of an electric arc furnace wherein, in the terminal part of the steel production process, the slag is extracted from the furnace and at this point directly subjected, in a still liquid form, to treatment according to steps (i) to (iii) at the same time as the end of the steel production cycle and during a subsequent new steel production cycle, after the steel produced in the previous cycle has been tapped, and
  • steps (i), (ii), (iii) are repeated with the parallel production of a new steel production heat and slag.
  • Iron, and preferably other alloying metals of steel obtained by the slag treatment can be added to the new or subsequent steelmaking heat, or are put to other uses.
  • steps (i), (ii), and (iii) of slag treatment preferably begin and end between the start of one deslagging and the next deslagging in parallel with the smelting process that takes place in the electric arc furnace.
  • steps (i), (ii) and (iii) as a whole preferably last between 30 min and 90 min.
  • step (i) occurs directly after deslagging, in particular preferably starts within 2 min of deslagging, and/or concurrently therewith, by joining the aluminium and/or silicon directly to the slag stream cascading out of the deslagging port forming part of the electric arc furnace.
  • This makes optimal use of the latent heat of the slag to make the chemical reaction with the aluminium and/or silicon take place, without additional heat inputs.
  • step (ii) takes place in a reactor without any energy input devices, i.e., without any additional heating devices, such as heating tubes in the reactor wall or electrodes inserted into the reactor.
  • Step (i) also advantageously takes place without any preheating of the mixed components.
  • the slag treatment process according to the invention is a process that preferably takes place tap-to-tap. This means that each time the electric arc furnace (EAF) deslags to then tap steel from the melt, that amount of slag (as mentioned the so-called black slag) is processed on its own, avoiding the accumulation of it to cool and/or to add it to other amounts of slag from previous castings or other plant areas (e.g., white slag from ladle furnaces (LF)).
  • EAF electric arc furnace
  • black slag black slag
  • said starting slag in step (i) is not mixed with slag from other processes and/or additional aluminium or silicon oxides. This allows for faster treatment of the still hot slag and avoids the need to have additional dispensers for the addition of these additional materials.
  • the slag obtained after treatment is directly usable in the cement industry or road construction.
  • Steps (i), (ii) and (iii), advantageously, take place in air and not in a controlled and inert atmosphere, resulting in plant simplification.
  • the following table 1 reports examples of the composition of the slag from an electric arc furnace (not usable as such in cement plants) and of a clinker.
  • the composition of the slags is approximated to that of the clinker to adapt it to the use in the cement industry:
  • Metallothermic processes such as aluminothermic or siliconthermic ones, allow the reduction of iron oxides to metallic Iron, simultaneously producing stable oxides (SiCh, AI2O3):
  • the Ellingham diagram is a Cartesian graph that relates the free energy and the temperature of the reactions forming the metal oxides starting from the elements that make them up.
  • Metallothermy is a metallurgical process that makes use of aluminium, or of another metal having high chemical affinity with oxygen, such as silicon, to reduce metal oxides and the reaction heat is such as to cause the reduced metal to melt.
  • the energy produced can then be recovered/used (e.g. for steam production).
  • the recovery of the ferrous part of the slag and of other alloying metals of steel with the generation of a high-value alloy simultaneously allows the production of a high-value slag through a process that is self-sustaining from an energy point of view, possibly with the energy recovery of the exothermic reaction.
  • This process reduces the content of iron oxide and of alloying metals of steel in the slag while producing at the same time aluminium and/or silicon oxides with a composition comparable to that of the clinker.
  • the metallothermic process can be carried out in a dedicated container called a metallothermic furnace, where the liquid slag can be fed together with the reducing reagents, but advantageously takes place in a reactor without heating devices.
  • a source of energy is not necessary, which is instead required in the case of feeding solid slag, for triggering the exothermic reaction.
  • a reaction in a metallothermic furnace is desired, such as in the presence of also high Carbon inputs, heating in the metallothermic furnace can take place: with resistors, with electric arc, plasma torch, etc.
  • step (i) it is also provided for feeding Carbon and in step (ii) the added Carbon reacts with said iron oxides, and preferably with said other oxides of alloying metals of steel, forming CO and Iron, and preferably other alloying metals of steel. It is partly solubilised in liquid Iron.
  • the addition of Carbon, causing an endothermic reaction (1) serves to manage the temperature of the system
  • the residual Carbon dissolves in the liquid Iron producing steel.
  • residual Carbon dissolves in liquid Iron producing pig iron.
  • the energy balance of the above reactions (2) and (3) depends on the consumption of Al and/or Si (exothermic reaction with metal oxides, such as FeO) and on the consumption of Carbon (endothermic reaction with metal oxides, such as FeO).
  • the addition of Carbon also serves to adjust the liquidus point of the liquid metal.
  • the liquidus is the geometric point in a phase diagram indicating the temperature above which the liquid phase exists and below which the solidification process begins with the coexistence of melt and crystals.
  • the process according to the invention is particularly advantageous when it produces highly alloyed Iron alloys, a case that takes place when the starting slag comprises oxides of alloying metals of steel, such as for example chromium oxides, and when in step (ii) also the oxides of said alloying metals are reduced by means of aluminium and/or silicon generating the relative alloying metals of steel, which together with Iron form a relative ferroalloy.
  • the process according to the invention makes it possible to recover also the waste from photovoltaic cells by being able to use the silicon contained therein in the metallothermic process.
  • said silicon scrap may therefore come from scrapping photovoltaic cells.
  • the mixture formed in step (ii) between the starting slag and the aluminium and/or silicon scrap, and optionally the Carbon comprises:
  • the slag produced by the metallothermic process is characterized by a reduced iron oxide content, and preferably a reduced content of oxides of alloying metals of steel, formed in step (ii) comprises, in weight percentages:
  • said Iron (or steel) and preferably said alloying metals of steel forming an alloy produced in step (ii) comprise:
  • said Iron is a cast iron produced in step (ii) that comprises 88 - 94 % Fe, 4 - 6 % Si, C in amounts between > 2 % and ⁇ 3.5 %, and 2 - 4 % other metals, such as Mn, V, Cr.
  • the slag is used in the production of cement.
  • a second aspect of the invention concerns a plant for slag treatment comprising:
  • first conveying means to transfer said slag to said metallothermic reactor without heating devices, wherein the first conveying means advantageously are said deslagging door forming part of the electric arc furnace;
  • a slag composition analysis system associated with a control system configured to dose the respective necessary quantities of aluminium and/or silicon scrap and optionally of Carbon through said second conveying means to said metallothermic reactor without heating devices;
  • the aluminium and/or silicon scrap fed in step (i) is shredded.
  • the plant according to the invention therefore preferably comprises a shredding device upstream of said tank container.
  • a third aspect of the invention concerns a mixture for the recovery of Iron and preferably of other alloying metals of steel from slag coming from the production of steel by means of electric arc furnaces, said mixture being suitable for use in the process according to the invention and comprising:
  • step (iii) may be used for other purposes within the steel mill comprising a plant according to the invention.
  • the process according to the invention also has a very low environmental impact.
  • the invention therefore achieves the object of presenting a black slag recycling process, which allows to obtain ferroalloys, i.e. steel (-200 kg/t of black slag) and material for the production of cement ( ⁇ 800kg/t of black slag).
  • This new slag treatment route with the connected production of ferroalloys, uses recycled metals (such as Al, Si) as reagents, does not develop CO2 (except in the case of partial feed of carbon) and does not require energy since the metallothermic reaction is exothermic. It is a circular economy that sees the slag as a secondary product from steel production (regarding it as a by-product) and aluminium and/or silicon scraps entering into the cycle and that sees materials immediately usable in various market sectors exiting the cycle.
  • the advantages deriving from the invention are therefore the recovery of metals, the production of highly valorized materials for the cement industry, no consumption of natural gas and low/no consumption of electrical energy to carry out the reaction, but the use of energy produced by the process itself possibly recovered.
  • the process is applicable, in particular, to low-C steel and alloy steels.
  • Fig. 1 represents a block diagram schematically illustrating the process according to the invention.
  • a metallothermic furnace or reactor 2 which is fed (arrows 10) with different starting materials: slag from an EAF, aluminium and/or silicon scrap and optionally Carbon, to create an optimal mixture for a metallothermic reaction.
  • the following products 6 can be extracted (arrow 12): ferroalloys, the treated slag and any low carbon monoxide flows that are conveyed (arrow 16) in the fume collection and treatment plant 18 for the oxidation thereof to CO2.
  • the treated slag is delivered (arrow 14) to the cement industry 8.
  • the scheme also describes a plant according to the invention, wherein the arrows 10, 12 and 14 indicate conveying means and the starting reagents 4 from feeding means of sources of aluminium and/or silicon scrap, slag (in this case an electric arc furnace) and optionally Carbon.
  • slag in this case an electric arc furnace
  • metallothermic furnace feed analysis systems and Al and/or Si scrap shredding systems which can be provided in the plant for the purposes illustrated above, are not represented.
  • As a metallothermic reactor it is possible to use the same type of containers used industrially for the production of ferroalloys via the metallothermic route.
  • Table 2 provides an example of thermodynamic equilibrium mass balance for the process according to the invention:
  • This approach according to the invention allows a wide process flexibility depending on the expected products, which are: Iron alloys, containing Si, Cr, C etc. with a high market value and slag for the cement industry.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé et une installation relative pour valoriser le laitier issu de la production d'acier, dans un four à arc électrique. A l'aide du principe de la métallothermie, le laitier est traité avec des rebuts d'aluminium et/ou de silicium, par exemple à partir de cellules photovoltaïques inutilisées, pour transformer les oxydes de fer et des oxydes quelconques d'autres métaux d'alliage d'acier respectivement en fer et en ferroalliages tout en convertissant en même temps de l'aluminium et du silicium en oxydes respectifs. De cette manière, les métaux de l'acier sont récupérés à partir du laitier de départ, et on obtient un laitier qui peut être utilisé de préférence, mais pas uniquement, dans la production de ciment. Le procédé se déroule de manière passive, sans apport d'énergie externe supplémentaire, et de préférence en même temps que la production d'acier permettant un traitement continu du laitier noir chaque fois qu'il est produit par un cycle de production d'acier.
PCT/IB2023/062749 2022-12-16 2023-12-15 Procédé et installation de traitement de laitier Ceased WO2024127339A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202380085083.6A CN120359194A (zh) 2022-12-16 2023-12-15 一种炉渣处理工艺及设备
EP23837775.8A EP4634127A1 (fr) 2022-12-16 2023-12-15 Procédé et installation de traitement de laitier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102022000025869 2022-12-16
IT102022000025869A IT202200025869A1 (it) 2022-12-16 2022-12-16 Procedimento e impianto per il trattamento di scoria

Publications (1)

Publication Number Publication Date
WO2024127339A1 true WO2024127339A1 (fr) 2024-06-20

Family

ID=85462350

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2023/062749 Ceased WO2024127339A1 (fr) 2022-12-16 2023-12-15 Procédé et installation de traitement de laitier

Country Status (4)

Country Link
EP (1) EP4634127A1 (fr)
CN (1) CN120359194A (fr)
IT (1) IT202200025869A1 (fr)
WO (1) WO2024127339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119040642A (zh) * 2024-08-27 2024-11-29 厦门大学 一种基于转炉钢渣回收有价金属的方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307237A1 (de) 1972-02-15 1973-08-23 Graenges Ab Verfahren zur behandlung von metallurgischen schlacken
US5882375A (en) 1995-05-02 1999-03-16 "Holderbank" Financiere Glarus Ag Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium
US6241797B1 (en) 1996-04-19 2001-06-05 “Holderbank” Financiere Glarus AG Process for reducing oxidic slags
US20060196308A1 (en) 2003-05-24 2006-09-07 Bernt Rollinger Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace
US20080156144A1 (en) 2006-12-28 2008-07-03 Posco Method for reducing to metallic chromium the chromium oxide in slag from stainless steel processing
WO2017100808A1 (fr) 2015-12-08 2017-06-15 Mintek Traitement de scories de manganèse
EP3375764B1 (fr) 2017-03-15 2020-01-08 Scholz Austria GmbH Procédé de traitement des laitiers métallurgiques
WO2023275714A1 (fr) * 2021-06-29 2023-01-05 E-Piros S.R.L. Procédé de traitement et de valorisation de scories de four-poche

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2307237A1 (de) 1972-02-15 1973-08-23 Graenges Ab Verfahren zur behandlung von metallurgischen schlacken
US5882375A (en) 1995-05-02 1999-03-16 "Holderbank" Financiere Glarus Ag Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium
US6241797B1 (en) 1996-04-19 2001-06-05 “Holderbank” Financiere Glarus AG Process for reducing oxidic slags
US20060196308A1 (en) 2003-05-24 2006-09-07 Bernt Rollinger Method for recovering metallic elements, especially metallic chromium, from slag containing metal oxides in an electric-arc furnace
US20080156144A1 (en) 2006-12-28 2008-07-03 Posco Method for reducing to metallic chromium the chromium oxide in slag from stainless steel processing
WO2017100808A1 (fr) 2015-12-08 2017-06-15 Mintek Traitement de scories de manganèse
EP3375764B1 (fr) 2017-03-15 2020-01-08 Scholz Austria GmbH Procédé de traitement des laitiers métallurgiques
WO2023275714A1 (fr) * 2021-06-29 2023-01-05 E-Piros S.R.L. Procédé de traitement et de valorisation de scories de four-poche

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119040642A (zh) * 2024-08-27 2024-11-29 厦门大学 一种基于转炉钢渣回收有价金属的方法
CN119040642B (zh) * 2024-08-27 2025-11-18 厦门大学 一种基于转炉钢渣回收有价金属的方法

Also Published As

Publication number Publication date
IT202200025869A1 (it) 2024-06-16
EP4634127A1 (fr) 2025-10-22
CN120359194A (zh) 2025-07-22

Similar Documents

Publication Publication Date Title
AU706170B2 (en) Process for the production of hydraulic binders and/or alloys, such as, e.g., ferrochromium or ferrovanadium
JP4838118B2 (ja) 溶融合金金属の製造方法及び関連する製造プラント
CN101838718A (zh) 中频电炉炉内脱磷脱硫的冶炼工艺
RU2226220C2 (ru) Способ переработки шлаков от производства стали
TW201038744A (en) Method for reclaiming iron and phosphorus from steelmaking slag
AU2008315932B2 (en) Method for producing stainless steel using direct reduction furnaces for ferrochrome and ferronickel on the primary side of a converter
CN101896625A (zh) 含有至多30%锰的钢熔体的制备方法
JP7364899B2 (ja) スラグ還元を伴った冷鉄源の溶解方法
KR101680094B1 (ko) 용선의 정련 방법
Xu et al. Recovery of low phosphorus iron from steel slag using secondary aluminum dross as the reductant
WO2024127339A1 (fr) Procédé et installation de traitement de laitier
JP2020180322A (ja) 転炉を用いた溶鋼の製造方法
CN102321783A (zh) 一种实验用感应炉的炼钢方法
CN102634634A (zh) 采用电弧炉生产锅炉管用高合金低磷钢的方法
JP5625654B2 (ja) 溶銑の製造方法
JP6451462B2 (ja) クロム含有スラグからのクロム回収方法
US6059854A (en) Process for processing waste incineration residues
JP2001234226A (ja) ステンレス溶鋼の精錬スラグの処理方法
JPS61147807A (ja) 精錬滓の変成処理方法
JP3063537B2 (ja) ステンレス鋼の製造方法
SK283194B6 (sk) Spôsob výroby surového železa, zliatin farebných kovov, FeCr a syntetických trosiek
RU2756057C2 (ru) Способ получения ванадиевого чугуна из железованадиевого сырья
JP7338663B2 (ja) 含クロム溶鉄の製造方法
CN103333994B (zh) 一种lf精炼埋弧脱氧渣的生产工艺
JP2010207672A (ja) クロムを含有する廃棄物の処理方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23837775

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202380085083.6

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2023837775

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2023837775

Country of ref document: EP

Effective date: 20250716

WWP Wipo information: published in national office

Ref document number: 202380085083.6

Country of ref document: CN

WWP Wipo information: published in national office

Ref document number: 2023837775

Country of ref document: EP