WO2020178480A1 - Combined smelting of molten slags and residuals from stainless steel and ferrochromium works - Google Patents

Combined smelting of molten slags and residuals from stainless steel and ferrochromium works Download PDF

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Publication number
WO2020178480A1
WO2020178480A1 PCT/FI2020/050129 FI2020050129W WO2020178480A1 WO 2020178480 A1 WO2020178480 A1 WO 2020178480A1 FI 2020050129 W FI2020050129 W FI 2020050129W WO 2020178480 A1 WO2020178480 A1 WO 2020178480A1
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Prior art keywords
metal
slag
stainless steel
ferrochromium
converter
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Ceased
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PCT/FI2020/050129
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French (fr)
Inventor
Kimmo VALLO
Timo PARVIAINEN
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Outokumpu Oyj
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Outokumpu Oyj
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Filing date
Publication date
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Priority to SE2150998A priority Critical patent/SE547477C2/en
Priority to PH1/2021/551890A priority patent/PH12021551890A1/en
Priority to JP2021551575A priority patent/JP2022523397A/en
Priority to CN202080012085.9A priority patent/CN113366129A/en
Priority to FI20217132A priority patent/FI131558B1/en
Priority to KR1020217025564A priority patent/KR20210134310A/en
Priority to CA3129671A priority patent/CA3129671A1/en
Publication of WO2020178480A1 publication Critical patent/WO2020178480A1/en
Anticipated expiration legal-status Critical
Priority to JP2025060900A priority patent/JP2025092685A/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • C22B7/02—Working-up flue dust
    • 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 
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2200/00—Recycling of waste material
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/20—Arc remelting
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/22—Remelting metals with heating by wave energy or particle radiation
    • 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
    • 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 relates to a method for smelting metal- and metal oxide- containing side streams, such as slags and wastes generated at stainless steel and ferrochromium works.
  • the invented processing method is a smelting process for all side streams and residuals from the mentioned fields of industry.
  • the streams are treated mainly in liquid phase for energy saving.
  • European patent 1 641 946 B is disclosed a method for producing a metal alloy melt in a number of subsequent steps, whereby dust and slags are recycled into the process in order to recover Cr and Ni.
  • side streams from stainless steel production and ferrochromium production are treated separately in various designated processes. Slags are treated in cooled-down form in metal recovery plants, and metal oxide wastes, eg. bag filter dusts, mill scales and sludges are commonly treated in separate waste smelting plants or landfilled. Some amounts of metal oxides are always present in side stream outputs, but it is generally not profitable to melt these streams again to improve the reduction result. Residual metals from the slag streams are traditionally recovered by means of mechanical metal recovery equipment, and some metals remain in slags after treatment.
  • stainless steel slag is a slag generated in stainless steel production in scrap melting, AOD/VOD-converting and ladle treatment processes.
  • ferrochromium slag is a slag generated in ferrochrome smelting operations from chromite ore.
  • Typical composition range of ferrochrome slag is presented in table 2.
  • metal oxide wastes such as filter dusts, mill scales and sludges are melted together with liquid slags from stainless steel and ferrochromium production in an electric arc furnace or a converter.
  • a significant feature is to supply slag feeds in liquid phase, thus significantly decreasing the energy requirement for melting and reduction.
  • Slag streams relevant for this invention are all slags from stainless steel and ferrochromium production vessels (electric arc furnaces, converters, ladle treatments) and also other metal- or metal oxide-containing side streams from the mentioned metal production facilities - eg. used refractories.
  • the metal oxide- containing side streams relevant for this innovation are metal oxide-, sulphate- or hydroxide-containing gas cleaning dusts, scales and sludges from stainless steel and ferrochromium production (e.g. from smelting, melting, grinding, hot and cold rolling and acid regeneration facilities).
  • the invented processing method combines the smelting of metal oxide wastes with molten slag feed. Hence, a separate processing unit is not needed for metal oxide waste streams. This combined process also makes traditional mechanical separation for metal remains in slag unnecessary.
  • the current processing method produces pure metal alloy and metal-free slag as output.
  • Smelting energy input for melting streams and reduction of metal oxides
  • AC or DC electric arc furnaces can be carried out in AC or DC electric arc furnaces.
  • chemical energy can be used if a converter vessel is preferred.
  • reductants are coke, anthracite, graphite, methane, plastic and rubber. Also other carbon sources may be employed. Further, silicon and aluminium based reductants can be used.
  • Dusts in this context may also include ZnO.
  • a stream for use in the method according to the invention may involve waste steel plant dust and particulate matter of a dimension up to 100 mm.
  • the optimum slag basicity for Cr 2 0 3 reduction is achieved by mixing molten stainless steel slags (acting as a lime source) and ferrochromium slags. Hence, additional lime feeding and melting is not needed, which saves natural resources as well as energy.
  • a method for producing a ferrochromium alloy which preferably contains Cr, Ni and Mo, in a number of successive and synchronized method steps:
  • Molten slags are fed into an electric arc furnace or a
  • slag may be used further in the metal industry and produced slag may be used further in various slag product applications, mainly in earthworks.
  • Fig. 1 shows the principle for the combined treatment of metal- and metal oxide- containing residuals from stainless steel and ferrochromium facilities.
  • Fig. 1 illustrates how molten slags are transported from metal production facilities to a smelting facility using vessels.
  • Liquid slags are fed into a smelting furnace in a phase, which equals to slag production volume.
  • solid slags and solid metal oxide waste streams are fed into the furnace from silos via feeding chutes.
  • Extra energy is provided by electrodes to achieve the desired reduction temperature (1500 °C - 1600 °C for metal and 1600 °C - 1700 °C for slag).
  • Carbon-based reductant is added to reduce metal oxides from the slag layer into the metal heel.
  • the settlement speed of reduced metal droplets or other metallurgical parameters can be modified by slag additives - e.g. quartz and lime.
  • the furnace After reduction and settlement of the produced metal alloy, the furnace is tapped.
  • the metal alloy is either used as liquid in stainless steel production or granulated into metal granules for usage in metal industries.
  • Produced slag from the smelting furnace is granulated by air, water or gas into slag products for different applications. Also air cooling may be used to produce slag aggregates.
  • the produced slag is metal free and further metal separation is not needed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Structural Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention relates to a method for smelting metal- and metal oxide- containing side streams, such as slags and wastes generated at stainless steel and ferrochromium works. The invented processing method is a smelting process for all side streams and residuals from the mentioned fields of industry. The streams are treated mainly in liquid phase for energy saving.

Description

COMBINED SMELTING OF MOLTEN SLAGS AND RESIDUALS FROM STAINLESS STEEL AND FERROCHROMIUM WORKS
FIELD OF THE INVENTION
The present invention relates to a method for smelting metal- and metal oxide- containing side streams, such as slags and wastes generated at stainless steel and ferrochromium works. The invented processing method is a smelting process for all side streams and residuals from the mentioned fields of industry. The streams are treated mainly in liquid phase for energy saving.
BACKGROUND
In the steel industry using electric-arc furnaces, substantial amounts of metal- oxide-containing dust is produced. This dust has generated a disposal problem, since it comprises significant amounts of metals which prevent dumping in landfills. In addition, the wasted metals represent an economical loss. In addition to the dust, several waste streams containing metals occur in the industry, which streams present opportunities for metal recovery and reduction of environmental impact.
Beginning in the 1970s, the Enviroplas process was developed in South Africa for processing of slags and dust from the metallurgical industry. A typical process involves a DC arc furnace which is fed with stainless steel plant dust, antracite, flux and a basic agent. The products are an alloy containing e.g. over 90% of the input Cr and Ni, and a disposable slag.
In European patent 1 641 946 B is disclosed a method for producing a metal alloy melt in a number of subsequent steps, whereby dust and slags are recycled into the process in order to recover Cr and Ni. Currently, side streams from stainless steel production and ferrochromium production are treated separately in various designated processes. Slags are treated in cooled-down form in metal recovery plants, and metal oxide wastes, eg. bag filter dusts, mill scales and sludges are commonly treated in separate waste smelting plants or landfilled. Some amounts of metal oxides are always present in side stream outputs, but it is generally not profitable to melt these streams again to improve the reduction result. Residual metals from the slag streams are traditionally recovered by means of mechanical metal recovery equipment, and some metals remain in slags after treatment.
There are no state-of-the-art methods for treating liquid slags from stainless steel production and ferrochromium production in the same processing unit.
Figure imgf000004_0001
TABLE1. Average chemical analysis of stainless steel and ferrochromium plants’ dusts, slags and scales (all in mass %) DEFINITIONS
In the context of the present invention, stainless steel slag is a slag generated in stainless steel production in scrap melting, AOD/VOD-converting and ladle treatment processes.
Figure imgf000005_0001
TABLE2. Typical stainless steel slag composition range In the context of the present invention, ferrochromium slag is a slag generated in ferrochrome smelting operations from chromite ore. Typical composition range of ferrochrome slag is presented in table 2.
SUMMARY OF THE INVENTION
The invention is defined by what is disclosed in the independent claim. Preferable embodiments are set out in the dependent claims.
According to the invention, metal oxide wastes such as filter dusts, mill scales and sludges are melted together with liquid slags from stainless steel and ferrochromium production in an electric arc furnace or a converter. A significant feature is to supply slag feeds in liquid phase, thus significantly decreasing the energy requirement for melting and reduction. DETAILED DESCRIPTION
Metal oxides from slag streams and metal oxide waste streams are reduced into metal by means of pyrometallurgy already in molten phase for energy saving, which improves the profitabality of smelting. Slag streams relevant for this invention are all slags from stainless steel and ferrochromium production vessels (electric arc furnaces, converters, ladle treatments) and also other metal- or metal oxide-containing side streams from the mentioned metal production facilities - eg. used refractories. The metal oxide- containing side streams relevant for this innovation are metal oxide-, sulphate- or hydroxide-containing gas cleaning dusts, scales and sludges from stainless steel and ferrochromium production (e.g. from smelting, melting, grinding, hot and cold rolling and acid regeneration facilities).
The invented processing method combines the smelting of metal oxide wastes with molten slag feed. Hence, a separate processing unit is not needed for metal oxide waste streams. This combined process also makes traditional mechanical separation for metal remains in slag unnecessary. The current processing method produces pure metal alloy and metal-free slag as output.
Smelting (energy input for melting streams and reduction of metal oxides) can be carried out in AC or DC electric arc furnaces. Also chemical energy can be used if a converter vessel is preferred.
The reduction of metal oxides is done with a reductant. Examples of useful reductants are coke, anthracite, graphite, methane, plastic and rubber. Also other carbon sources may be employed. Further, silicon and aluminium based reductants can be used.
Dusts in this context may also include ZnO. A stream for use in the method according to the invention may involve waste steel plant dust and particulate matter of a dimension up to 100 mm.
When a method according to the invention is utilized, recovery of chromium, iron and nickel as metal is typically over 90%.
According to the invention, the optimum slag basicity for Cr203 reduction is achieved by mixing molten stainless steel slags (acting as a lime source) and ferrochromium slags. Hence, additional lime feeding and melting is not needed, which saves natural resources as well as energy.
According to the invention, a method is provided for producing a ferrochromium alloy, which preferably contains Cr, Ni and Mo, in a number of successive and synchronized method steps:
• in a first method step, molten stainless steel slag and molten
ferrochromium slag are transported from stainless steel and
ferrochromium production facilities to a treatment plant for molten
slags. Molten slags are fed into an electric arc furnace or a
converter, followed by natural mixing of liquid stainless steel slag
and ferrochromium slag.
• in a second method step, reduction energy is supplied to the melt
in the form of electricity, or chemical energy in embodiments
utilizing a converter. Additional energy is needed also for reaching
the desired melt temperature, as slag cools down slightly during
transportation.
• in a third method step, metal oxide waste streams and reductants
- preferably anthracite - are introduced to the melt, and reduction
of metal oxides in the slag takes place at the optimum
temperature.
• in a fourth method step, reduced metal droplets in the slag are
allowed to settle into the metal heel. After metal reduction and
settling, the slag and the metal are tapped out from the reduction
furnace or vessel.
• in a fifth method step, tapped metal and slag are either cooled into
aggregate form or granulated to droplet-like particles. Metal alloy
can also be immediately used as liquid in a stainless steel
production facility for energy saving. The produced metal alloy
may be used further in the metal industry and produced slag may be used further in various slag product applications, mainly in earthworks.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is illustrated in more detail referring to the attached drawing where
Fig. 1 shows the principle for the combined treatment of metal- and metal oxide- containing residuals from stainless steel and ferrochromium facilities.
EMBODIMENTS ILLUSTRATING THE INVENTION
Fig. 1 illustrates how molten slags are transported from metal production facilities to a smelting facility using vessels. Liquid slags are fed into a smelting furnace in a phase, which equals to slag production volume. In addition, solid slags and solid metal oxide waste streams are fed into the furnace from silos via feeding chutes. Extra energy is provided by electrodes to achieve the desired reduction temperature (1500 °C - 1600 °C for metal and 1600 °C - 1700 °C for slag). Carbon-based reductant is added to reduce metal oxides from the slag layer into the metal heel. The settlement speed of reduced metal droplets or other metallurgical parameters can be modified by slag additives - e.g. quartz and lime. After reduction and settlement of the produced metal alloy, the furnace is tapped. The metal alloy is either used as liquid in stainless steel production or granulated into metal granules for usage in metal industries. Produced slag from the smelting furnace is granulated by air, water or gas into slag products for different applications. Also air cooling may be used to produce slag aggregates. The produced slag is metal free and further metal separation is not needed.

Claims

1. A method for manufacturing ferrochrome alloy, comprising the steps of
- feeding to an electric arc furnace or a converter molten stainless steel slag and molten ferrochromium slag, and allowing the slags to mix
- supplying to the melt in the electric arc furnace electrical energy, or to the melt in the converter chemical energy,
- supplying to the melt in the electric arc furnace or the converter at least one particulate matter comprising metal salts and at least one reductant, - allowing reduction of the metal oxides, forming metal alloy, and allowing the metal alloy to settle,
- recovering metal alloy and slag from the electric arc furnace or the converter.
2. The method according to claim 1 , wherein the particulate matter is electric- arc-furnace dust.
3. The method according to claim 1 , wherein the particulate matter comprises at least one metal sulfate, sulfide or hydroxide.
4. The method according to claim 1 , wherein the particulate matter is flue gas dust, scale, precipitate or sludge, originating from a metallurgical process.
5. The method according to claim 1 , wherein the at least one reductant comprises antracite.
6. The method according to claim 1 , wherein no basic material is added to the electric arc furnace or the converter.
PCT/FI2020/050129 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works Ceased WO2020178480A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
SE2150998A SE547477C2 (en) 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works
PH1/2021/551890A PH12021551890A1 (en) 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works
JP2021551575A JP2022523397A (en) 2019-03-01 2020-02-28 Combined melting of molten slag and residues from stainless steel and ferrochrome plants
CN202080012085.9A CN113366129A (en) 2019-03-01 2020-02-28 Mixed smelting of molten slag and residue from stainless steel and ferrochrome operations
FI20217132A FI131558B1 (en) 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works
KR1020217025564A KR20210134310A (en) 2019-03-01 2020-02-28 Combined smelting of molten slag and residues from stainless steel and ferrochrome processing
CA3129671A CA3129671A1 (en) 2019-03-01 2020-02-28 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works
JP2025060900A JP2025092685A (en) 2019-03-01 2025-04-02 Combined Melting of Molten Slags and Residues from Stainless Steel and Ferrochrome Plants

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FI20195153 2019-03-01
FI20195153A FI20195153A1 (en) 2019-03-01 2019-03-01 Combined smelting of molten slags and residuals from stainless steel and ferrochromium works

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KR (1) KR20210134310A (en)
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CA (1) CA3129671A1 (en)
FI (2) FI20195153A1 (en)
PH (1) PH12021551890A1 (en)
SE (1) SE547477C2 (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026047282A1 (en) * 2024-08-27 2026-03-05 Betolar Oyj Process for recovering metal materials from steel slag
WO2026078585A1 (en) * 2024-10-09 2026-04-16 Danieli & C. Officine Meccaniche S.P.A. Process and plant for slag treatment

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113265534B (en) * 2021-04-14 2023-03-31 嘉峪关宏电铁合金有限责任公司 Low-grade ferrochromium slag recycling production process
FI20245516A1 (en) * 2024-04-22 2025-10-23 Betolar Oyj Process for recycling metal materials from slag

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6010553A (en) * 1996-01-17 2000-01-04 "Holderbank" Financiere Glarus Ag Process for producing pig iron, nonferrous heavy metal alloys, FECR and synthetic blast furnace slags using metal-oxide-containing waste incineration residues or slags
KR101176658B1 (en) * 2003-06-25 2012-08-23 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 Method for manufacturing alloyed molten metal and associated manufacturing equipment
CN107058677A (en) * 2017-05-22 2017-08-18 山西太钢不锈钢股份有限公司 A kind of smelting process of utilization stainless steel electroslag

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI934698L (en) * 1993-10-25 1995-04-26 Outokumpu Steel Oy Method and apparatus for producing stainless steel
JP3539263B2 (en) * 1999-02-03 2004-07-07 Ｊｆｅスチール株式会社 Method for producing reduced metal from metal-containing material and mobile hearth furnace for producing reduced metal
AT407263B (en) * 1999-04-22 2001-02-26 Holderbank Financ Glarus METHOD FOR REPRODUCING STEEL SLAG
JP2001316712A (en) * 2000-05-02 2001-11-16 Nippon Steel Corp Chromium recovery method from chromium-containing slag
ZA200300865B (en) * 2001-06-18 2004-02-26 Kobe Steel Ltd Method for manufacturing metal nuggets.
KR20050109763A (en) * 2004-05-17 2005-11-22 주식회사 포스코 Method for recovery valuable metals from steel-making slag of stainless steel
KR100793591B1 (en) * 2006-12-28 2008-01-14 주식회사 포스코 Method for reducing chromium metal from chromium oxide containing slag
CN107699646B (en) * 2017-11-16 2023-02-21 中冶沈勘秦皇岛工程设计研究总院有限公司 Stainless steel slag granulating device and method
CN108676942A (en) * 2018-05-18 2018-10-19 廖辉明 The materials such as a kind of iron content and/or zinc lead bronze tin cooperate with processing recovery method with molten steel slag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6010553A (en) * 1996-01-17 2000-01-04 "Holderbank" Financiere Glarus Ag Process for producing pig iron, nonferrous heavy metal alloys, FECR and synthetic blast furnace slags using metal-oxide-containing waste incineration residues or slags
KR101176658B1 (en) * 2003-06-25 2012-08-23 지멘스 브이에이아이 메탈스 테크놀로지스 게엠베하 Method for manufacturing alloyed molten metal and associated manufacturing equipment
CN107058677A (en) * 2017-05-22 2017-08-18 山西太钢不锈钢股份有限公司 A kind of smelting process of utilization stainless steel electroslag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026047282A1 (en) * 2024-08-27 2026-03-05 Betolar Oyj Process for recovering metal materials from steel slag
WO2026078585A1 (en) * 2024-10-09 2026-04-16 Danieli & C. Officine Meccaniche S.P.A. Process and plant for slag treatment

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