SE2150998A1 - 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 worksInfo
- Publication number
- SE2150998A1 SE2150998A1 SE2150998A SE2150998A SE2150998A1 SE 2150998 A1 SE2150998 A1 SE 2150998A1 SE 2150998 A SE2150998 A SE 2150998A SE 2150998 A SE2150998 A SE 2150998A SE 2150998 A1 SE2150998 A1 SE 2150998A1
- Authority
- SE
- Sweden
- Prior art keywords
- metal
- slag
- stainless steel
- converter
- electric arc
- Prior art date
Links
- 239000002893 slag Substances 0.000 title claims abstract description 58
- 239000010935 stainless steel Substances 0.000 title claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 17
- 229910000604 Ferrochrome Inorganic materials 0.000 title claims abstract description 14
- 238000003723 Smelting Methods 0.000 title abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910044991 metal oxide Inorganic materials 0.000 claims description 20
- 150000004706 metal oxides Chemical class 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 claims description 10
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000013618 particulate matter Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 1
- 239000003546 flue gas Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 238000010310 metallurgical process Methods 0.000 claims 1
- 239000002244 precipitate Substances 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- -1 scale Substances 0.000 claims 1
- 239000010802 sludge Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 11
- 238000003672 processing method Methods 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C22B7/02—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
- 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
- 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
- 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
- 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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Analytical Chemistry (AREA)
- Structural Engineering (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)
Abstract
The present invention relates to a method for smelting metal- and metal oxidecontaining 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 FROMSTAINLESS 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 steeland ferrochromium works. The invented processing method is a smelting processfor all side streams and residuals from the mentioned fields of industry. The streams are treated mainly in liquid phase for energy saving.
BACKGROUND ln 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 inlandfills. ln addition, the wasted metals represent an economical loss. ln additionto the dust, several waste streams containing metals occur in the industry, whichstreams present opportunities for metal recovery and reduction of environmental impact.
Beginning in the 1970s, the Enviroplas process was developed in South Africafor processing of slags and dust from the metallurgical industry. A typical processinvolves 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. ln European patent 1 641 946 B is disclosed a method for producing a metal alloymelt 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 ferrochromiumproduction are treated separately in various designated processes. Slags aretreated 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 alwayspresent in side stream outputs, but it is generally not profitable to melt thesestreams again to improve the reduction result. Residual metals from the slagstreams are traditionally recovered by means of mechanical metal recoveryequipment, 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.
Material CaO SiO2 Cr203 Fe203 TiO2 A|203 MnO MgO NiO% % % % % % % % EAF- 30-SLAG 60 20-30 1-15 0.5-5 0.5-2 1-10 1-5 5-15 0-1AOD- 45-SLAG 60 20-30 0-5 0-4 0.1-1 0-4 0-2 5-15 0-1LF- 45- SLAG 60 20-30 0-5 0-4 0.1 -1 0-4 0-2 5-15 0-1FECR-SLAG 0-4 20-30 4-20 2-7 0-2 20-30 0-2 15-30 0-1SMS-DUST 1-25 2-12 5-25 15-75 0-1 0-1 0-6 0-8 0-8FECR-DUST 0-2 0-40 5-70 1-30 0-2 5-20 0-2 5-15 0-2SMS-SCALE 0-3 2-5 10-18 50-75 0-2 0-1 0-2 0-1 0-6 TABLE1. Average chemical analysis of stainless steel and ferrochromium plants'dusts, slags and scales (all in mass %) DEFINITIONS ln the context of the present invention, stainless steel slag is a slag generated instainless steel production in scrap melting, AODNOD-converting and ladle treatment processes.
Cr203 Fe203 A|203 MgO CaO SiO2 MnO TiO2% % % % % % % %35- 20-"I-'IO% O.5-7% 2-10% 5-15% 65% 35% O."|-2% O."|-2% TABLE2. Typical stainless steel slag composition range ln the context of the present invention, ferrochromium slag is a slag generated inferrochrome 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 scalesand sludges are melted together with liquid slags from stainless steel andferrochromium production in an electric arc furnace or a converter. A significantfeature is to supply slag feeds in liquid phase, thus significantly decreasing the energy requirement for melting and reduction.DETAILED DESCRIPTIONMetal 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 andferrochromium production vessels (electric arc furnaces, converters, ladletreatments) and also other metal- or metal oxide-containing side streams fromthe mentioned metal production facilities - eg. used refractories. The metal oxide-containing side streams relevant for this innovation are metal oxide-, sulphate- orhydroxide-containing gas cleaning dusts, scales and sludges from stainless steeland ferrochromium production (e.g. from smelting, melting, grinding, hot and coldrolling and acid regeneration facilities).
The invented processing method combines the smelting of metal oxide wasteswith molten slag feed. Hence, a separate processing unit is not needed for metaloxide waste streams. This combined process also makes traditional mechanicalseparation 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 becarried 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 usefulreductants are coke, anthracite, graphite, methane, plastic and rubber. Also othercarbon 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 methodaccording to the invention may involve waste steel plant dust and particulatematter 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 CrzOa reduction isachieved 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 ferrochromiumalloy, which preferably contains Cr, Ni and Mo, in a number of successive and synchronized method steps: o in a first method step, molten stainless steel slag and moltenferrochromium slag are transported from stainless steel andferrochromium production facilities to a treatment plant for moltenslags. Molten slags are fed into an electric arc furnace or aconverter, followed by natural mixing of liquid stainless steel slag and ferrochromium slag. o in a second method step, reduction energy is supplied to the meltin the form of electricity, or chemical energy in embodimentsutilizing a converter. Additional energy is needed also for reachingthe desired melt temperature, as slag cools down slightly during transportation. o in a third method step, metal oxide waste streams and reductants- preferably anthracite - are introduced to the melt, and reductionof metal oxides in the slag takes place at the optimum temperature. o in a fourth method step, reduced metal droplets in the slag areallowed to settle into the metal heel. After metal reduction andsettling, the slag and the metal are tapped out from the reduction furnace or vessel. o in a fifth method step, tapped metal and slag are either cooled intoaggregate form or granulated to droplet-like particles. Metal alloycan also be immediately used as liquid in a stainless steelproduction facility for energy saving. The produced metal alloymay 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 facilitiesto a smelting facility using vessels. Liquid slags are fed into a smelting furnace ina phase, which equals to slag production volume. ln addition, solid slags and solidmetal oxide waste streams are fed into the furnace from silos via feeding chutes.Extra energy is provided by electrodes to achieve the desired reductiontemperature (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 intothe metal heel. The settlement speed of reduced metal droplets or othermetallurgical 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 granulatedinto metal granules for usage in metal industries. Produced slag from the smeltingfurnace is granulated by air, water or gas into slag products for differentapplications. Also air cooling may be used to produce slag aggregates. Theproduced slag is metal free and further metal separation is not needed.
Claims (5)
1. A method for manufacturing ferrochrome alloy, comprising the steps of feeding to an electric arc furnace or a converter molten stainless steel slagand molten ferrochromium slag, and allowing the slags to mix supplying to the melt in the electric arc furnace electrical energy, or to themelt in the converter chemical energy, supplying to the melt in the electric arc furnace or the converter at leastone particulate matter comprising metal salts and at least one reductant,allowing reduction of the metal oxides, forming metal alloy, and allowingthe 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. The method according to claim 1, wherein the particulate matter is fluegas dust, scale, precipitate or sludge, originating from a metallurgical process.
4. The method according to claim 1, wherein the at least one reductant comprises antracite.
5. The method according to claim 1, wherein no basic material is added to the electric arc furnace or the converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20195153A FI20195153A1 (en) | 2019-03-01 | 2019-03-01 | Combined smelting of molten slags and residuals from stainless steel and ferrochromium works |
| PCT/FI2020/050129 WO2020178480A1 (en) | 2019-03-01 | 2020-02-28 | Combined smelting of molten slags and residuals from stainless steel and ferrochromium works |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE2150998A1 true SE2150998A1 (en) | 2021-08-12 |
Family
ID=72337367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE2150998A SE2150998A1 (en) | 2019-03-01 | 2020-02-28 | Combined smelting of molten slags and residuals from stainless steel and ferrochromium works |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JP2022523397A (en) |
| KR (1) | KR20210134310A (en) |
| CN (1) | CN113366129A (en) |
| CA (1) | CA3129671A1 (en) |
| FI (2) | FI20195153A1 (en) |
| SE (1) | SE2150998A1 (en) |
| TW (1) | TW202033771A (en) |
| WO (1) | WO2020178480A1 (en) |
Families Citing this family (1)
| 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 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA963234B (en) * | 1995-05-02 | 1996-07-29 | Holderbank Financ Glarus | Process for the production of hydraulic binders and/or alloys such as e g ferrochromium of ferrovanadium |
| AT405839B (en) * | 1996-01-17 | 1999-11-25 | Holderbank Financ Glarus | METHOD FOR PRODUCING RAW IRON, COLORED METAL ALLOYS, FECR AND SYNTHETIC BLAST FURNACE SLAGS USING METAL OXIDE CONTAINING WASTE COMBUSTION RESIDUES OR SLAGS |
| 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 | Method for recovering chromium from chromium containing slag |
| AT412349B (en) * | 2003-06-25 | 2005-01-25 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING AN ALLOYED METAL MELT AND PRODUCTION PLANT THEREFOR |
| 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 reduction of metallic chromium from slag containing chromium oxide |
| 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 |
| 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 |
-
2019
- 2019-03-01 FI FI20195153A patent/FI20195153A1/en not_active Application Discontinuation
-
2020
- 2020-02-27 TW TW109106471A patent/TW202033771A/en unknown
- 2020-02-28 SE SE2150998A patent/SE2150998A1/en unknown
- 2020-02-28 JP JP2021551575A patent/JP2022523397A/en active Pending
- 2020-02-28 CN CN202080012085.9A patent/CN113366129A/en active Pending
- 2020-02-28 KR KR1020217025564A patent/KR20210134310A/en unknown
- 2020-02-28 WO PCT/FI2020/050129 patent/WO2020178480A1/en active Application Filing
- 2020-02-28 CA CA3129671A patent/CA3129671A1/en active Pending
- 2020-02-28 FI FI20217132A patent/FI20217132A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI20217132A1 (en) | 2021-08-26 |
| WO2020178480A1 (en) | 2020-09-10 |
| CN113366129A (en) | 2021-09-07 |
| TW202033771A (en) | 2020-09-16 |
| KR20210134310A (en) | 2021-11-09 |
| FI20195153A1 (en) | 2020-09-02 |
| CA3129671A1 (en) | 2020-09-10 |
| JP2022523397A (en) | 2022-04-22 |
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