ZA200505659B - Method for producing foamed slag on high-chromium melts in an electric furnace - Google Patents
Method for producing foamed slag on high-chromium melts in an electric furnace Download PDFInfo
- Publication number
- ZA200505659B ZA200505659B ZA200505659A ZA200505659A ZA200505659B ZA 200505659 B ZA200505659 B ZA 200505659B ZA 200505659 A ZA200505659 A ZA 200505659A ZA 200505659 A ZA200505659 A ZA 200505659A ZA 200505659 B ZA200505659 B ZA 200505659B
- Authority
- ZA
- South Africa
- Prior art keywords
- slag
- fact
- accordance
- preforms
- furnace
- Prior art date
Links
- 239000002893 slag Substances 0.000 title claims description 53
- 239000000155 melt Substances 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910052804 chromium Inorganic materials 0.000 title description 8
- 239000011651 chromium Substances 0.000 title description 8
- 238000000034 method Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 238000010891 electric arc Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000000161 steel melt Substances 0.000 claims description 2
- 239000008188 pellet Substances 0.000 description 25
- 238000006243 chemical reaction Methods 0.000 description 17
- 238000005187 foaming Methods 0.000 description 15
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 229910000423 chromium oxide Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- 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
- C21C5/54—Processes yielding slags of special composition
-
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- 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
- C21C2300/00—Process aspects
- C21C2300/02—Foam creation
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Analytical Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
TRANSLATION (HM-657PCT) :
PCT/EP2004/004, 312 . METHOD FOR PRODUCING FOAMED SLAG ON HIGH-CHROMIUM
MELTS IN AN ELECTRIC ARC FURNACE
The invention concerns a method for producing foamed slag on high-chromium steel melts in an electric arc furnace, wherein a mixture of a metal oxide and carbon is introduced into the furnace, the metal oxide is reduced by the carbon in the slag, and the resulting gases bring about the foaming of the slag by bubble formation.
In the operation of electric arc furnaces, the charge, i.e., mainly scrap, and alloys are melted by the electric arcs of the electrodes, which extend downward into the furnace shell.
The slag fulfils not only its primary function, i.e., the removal of undesirable components from the melt, but also a protective function in the foamed state. In this state, the slag encloses the space between the ends of the electrodes and the surface of the metal and protects the refractory lining of the furnace from radiant energy of the electric arc. Due to the low thermal conductivity of the foamed slag, the radiation of the electric arc towards the wall of the arc furnace is greatly reduced, and thus the energy input into the metal melt is improved.
In the case of nonstainless steels or steels with a low : chromium content, the foamed slag is produced by simultaneous } injection of carbon and oxygen onto the slag and into the steel bath, respectively. The gas that evolves during the reactions . that occur: 2(C] + {Oz} = 2{CO} 2(CO} + [0,) + 2{CO.) causes foaming of the slag. In addition, the carbon reduces the ferrous oxide to iron and carbon monoxide according to the equation (FeO) + [C] * [Fe] + {CO}.
The foamed slag encases the electrodes and is present as a protective layer between the electric arcs and the furnace wall.
In the case of high-chromium melts, the injected carbon reacts basically as a reducing element of the chromium oxide.
The reactions specified above have little importance in the metal bath. Besides, the content of iron in the slag is too low to guarantee satisfactory foaming of the slag. All together, in the case of high-chromium melts, it is difficult, due to the differences that have been mentioned, to produce a foaming slag in the superheating phase.
For this purpose, EP 0 829 545 Bl, which concerns a method for producing a foamed slag on molten stainless steel in an - electric arc furnace, proposes that a powder, which consists of ] a metal oxide, either zinc oxide or lead oxide, and carbon, be introduced into the slag. The oxide contained in the powder is . reduced by reaction with the carbon. Bubbles consisting mainly of carbon monoxide are formed in the slag and cause the slag to foam. The powder is introduced into the slag with the aid of an injection medium, for example, nitrogen.
Thus, in accordance with the prior art, the reactive mixture is introduced into the slag or melt as a powder. Due to the relatively large surface area associated with the powdered form, brief, violent reactions occur. Moreover, the reaction is locally limited in the vicinity of the injection device and here especially at the tip of the injection lance in the molten bath.
Proceeding from this type of prior art, the objective of the invention is to develop a method for producing foamed slag on molten high-chromium steels in an electric arc furnace, in which the processes that initiate the foaming reaction occur in a controlled way.
This objective is achieved by a method with the features of
Claim 1. Advantageous refinements of the invention are described in the dependent claims.
In accordance with the invention, the furnace is charged . with a mixture of a metal oxide and carbon, not as a powder but rather as compressed preforms and/or preforms provided with a binder. In addition to the preferred pelletized form, it is possible to use other forms, for example, the briquet form. The systematic adjustment of the properties of the preforms, hereinafter referred to in terms of their embodiment as pellets, makes it possible, in contrast to use in powdered form, to control the evolution of gas with respect to location, type, and time -- especially the starting point with respect to time, the rate, the intensity of the reaction, and/or the duration of the reaction.
In particular, the density properties of the pellets are adjusted by the compression pressure and/or the type and amount of an admixed iron carrier, for example, ferronickel, and a binder. In this regard, in accordance with a preferred variant, the density of the compressed preforms is adjusted in such a way that the pellets float in the slag near or directly on the metal-slag phase boundary itself. The addition of the iron carrier ensures that the pellets are heavier than the slag but lighter than the metal melt. The evolution of gas thus occurs in a locally well-defined way, namely, in the slag at the boundary between the metal and slag. In this way, there is no : contact between pellets and metal bath, so that carburization of ] the melt is prevented. It is also possible to adjust the pellet properties in such a way that the pellets can occupy different } positions between the molten bath and the slag. This guarantees that the processes that initiate the foaming occur only in the slag, so that the effectiveness is increased.
Furthermore, the pellets should have a density or a degree of compaction that causes them to disintegrate uniformly and slowly, so that the foaming reaction occurs uniformly and over a relatively long period of time. In addition, it is possible to cause the reactions to occur with a time delay by using even higher pressure compaction. This prevents the reaction from occurring too soon and guarantees that the reaction will not start until the pellets are distributed in the slag.
In addition, the evolution of gas can be systematically adjusted by the size of the pellets. As a result of the fact that the pellets have a relatively large diameter and thus a smaller specific surface than powders, the foaming reaction can be maintained for relatively long periods of time with uniform "gas evolution.
The basic components metal (Me) oxide and carbon are involved in the following reactions: ; (Mex0,) + [C] + x[Me] + {CO} 2{CO} + {0} = 2{COy}
Waste products of steel production can be used for the mixture for producing the pellets, such as carbon from consumed electrodes or pieces of waste scale. The use of binders is advisable especially with mixtures of this type.
Aside from the basic components metal oxide and carbon, a flux, especially limestone, is additionally pressed into the proposed pelletized form. The desired CO/CO; formation is additionally intensified by the limestone.
Furthermore, a slag thinner, preferably CaF,, can be additionally pressed into or bound with the mixture. This counteracts the tendency of chromium-containing slags to become increasingly viscous with increasing chromium oxide content.
It is also advisable to press a reducing agent, such as silicon and/or aluminum, into some of the pellets, especially together with limestone, to control the chromium oxide content of the slag. These reducing agents reduce the chromium oxide contained in the slag and thus lower the chromium content of the slag. In addition, the foaming of the slag is improved.
In contrast to powder, which must be locally injected, the pellets are added in various parts of the furnace through the - furnace roof and/or the sidewalls of the furnace. This is not } possible with powder, because large fractions of the powder would be sucked out by the dust removal system of the furnace. } It is also advisable to introduce the pellets into the slag in a directed way in the vicinity of and directly at the hot spots of the electrodes to allow the foaming process to occur especially at the electrodes.
Additional details and advantages of the invention are specified in the following description of the drawings. -- Figure 1 shows a schematic representation of the cross section of an electric arc furnace with charging devices for the slag-foaming pellets. -- Figure 2 shows the furnace in Figure 1 from above.
The electric arc furnace 1 shown in Figure 1 comprises a furnace shell 2 with a refractory wall 3 and a furnace roof 4.
After the furnace has been charged with scrap and alloying components, three electrodes (in the present case) 5a-c are lowered into the interior of the furnace. The solid material is melted down by the electric arcs that are produced. A slag layer 7 is formed and floats on the melt. To initiate a foaming reaction of the slag 7 between the electrodes 5a-c and the refractory furnace wall 3, slag-foaming material is introduced . into the interior of the furnace as preforms 8, namely, in the } form of pellets. The pellets are preferably charged through the furnace roof 4, specifically, through the fifth roof hole 9, and/or the sidewalls 10. Injection systems with injection lines or gravity feed systems 11 that extend through the sidewalls 10 of the furnace are provided for this purpose. Instead of injection lines, it is also possible to use injection lances.
Alternatively or additionally, a pneumatic conveyance system 12 consisting of closed circular pipelines is also suitable for charging the pellets. This system has a closed circular pipeline 13 that runs along the roof 4, as shown in
Figure 2, which at the same time also has closed circular pipeline segments 14 that run radially to the roof. Three charging holes 15a-c (in the illustrated example) are provided in the closed circular pipelines 13, 14 and the corresponding roof wall. The pellets are introduced into the furnace slag 7 uniformly over the cross section of the furnace by this system 12. In this regard, the charging holes 15a-c are arranged in such a way that the pellets react with the slag 7 in the vicinity of the hot spots.
The pellets float in the slag 7, where they react to produce the desired gas evolution and thus foaming reaction in a : way that is controlled with respect to location, time, and type. . In particular, the adjustment of the density and size of the pellets makes it possible to ensure that the gas evolution . process proceeds as uniformly as possible, for a relatively long time and not too violently. A controlled reaction at the surface of the pellets results in uniform foaming of the slag.
List of Reference Numbers 1 electric arc furnace 2 furnace shell 3 refractory wall 4 furnace roof electrodes 6 melt : 7 slag 8 preforms (pellets) 9 fifth roof hole sidewalls of the furnace 11 injection line 12 pneumatic conveyance system 13 closed circular pipeline 14 sections of closed circular pipeline charging holes
Claims (11)
1. Method for producing foamed slag (7) on high-chromium steel melts (6) in an electric arc furnace (1), wherein a mixture of a metal oxide and carbon is introduced into the furnace (1), the metal oxide is reduced by the carbon in the : slag (7), and the resulting gases form bubbles in the slag, which thus cause the slag to foam, characterized by the fact ’ that the mixture of metal oxide and carbon is introduced into . the furnace as compressed preforms (8) and/or preforms (8) provided with a binder.
2. Method in accordance with Claim 1, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they float in the slag (7).
3. Method in accordance with Claim 1 or Claim 2, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they float in the slag near the phase boundary between the melt (6) and the slag (7). =
4. Method in accordance with Claim 2 or Claim 3, characterized by the fact that the density of the preforms (8) is adjusted by the addition of an iron carrier.
5. Method in accordance with any of Claims 1 to 4, characterized by the fact that the density of the preforms (8) is adjusted in such a way that they disintegrate in the slag (7) uniformly and slowly, and the evolution of gas occurs uniformly ¢ and over a relatively long period of time.
.
6. Method in accordance with any of Claims 1 to 5, " characterized by the fact that the density of the preforms (8)
. is adjusted in such a way that they disintegrate with a time delay.
7. Method in accordance with any of Claims 1 to 6, characterized by the fact that a flux, preferably limestone, is additionally added to the mixture.
8. Method in accordance with any of Claims 1 to 7, characterized by the fact that a slag thinner, preferably CaF, is additionally added to the mixture.
9. Method in accordance with any of Claims 1 to 8, characterized by the fact that a reducing agent, preferably silicon and/or aluminum, is additionally added to the mixture.
10. Method in accordance with any of Claims 1 to 9, characterized by the fact that the preforms (8) are introduced through the sidewalls (10) and/or the furnace roof (4) of the electric arc furnace (1).
11. Method in accordance with any of Claims 1 to 10, characterized by the fact that the preforms (8) are introduced into the slag (7) in a directed way in the vicinity of or directly at the hot spots of the electrodes (5a-c).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10323505A DE10323505A1 (en) | 2003-05-24 | 2003-05-24 | Process for producing a foam slag on high-chromium melts in an electric furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA200505659B true ZA200505659B (en) | 2006-08-30 |
Family
ID=33441236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA200505659A ZA200505659B (en) | 2003-05-24 | 2005-07-14 | Method for producing foamed slag on high-chromium melts in an electric furnace |
Country Status (13)
Country | Link |
---|---|
US (2) | US20060260435A1 (en) |
EP (1) | EP1629126B1 (en) |
JP (1) | JP4701331B2 (en) |
KR (1) | KR101174691B1 (en) |
CN (2) | CN102061356A (en) |
CA (1) | CA2519728C (en) |
DE (1) | DE10323505A1 (en) |
MY (1) | MY146471A (en) |
RU (1) | RU2343208C2 (en) |
TW (1) | TWI295690B (en) |
UA (1) | UA84151C2 (en) |
WO (1) | WO2004104232A1 (en) |
ZA (1) | ZA200505659B (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006004532B4 (en) * | 2006-02-01 | 2014-10-09 | Sms Siemag Aktiengesellschaft | Process for producing a foamed slag in a metallic melt |
DE102007006529A1 (en) | 2007-02-09 | 2008-08-14 | Sms Demag Ag | Process and reduction of a chromium-containing slag in an electric arc furnace |
DE102007050478A1 (en) | 2007-10-23 | 2009-04-30 | Sms Demag Ag | Process for stainless steel production with direct reduction furnaces for ferrochrome and ferronickel on the primary side of a converter |
DE102008028011A1 (en) * | 2008-06-09 | 2009-12-10 | Sms Siemag Aktiengesellschaft | Process for producing a foamed slag on austenitic stainless melts in an electric arc furnace |
DE102008032975A1 (en) * | 2008-07-07 | 2010-01-14 | Sms Siemag Aktiengesellschaft | Process for producing foamed slag |
DE102009020494A1 (en) * | 2009-05-08 | 2010-11-11 | Sms Siemag Ag | A method of slag foaming a non-stainless steel melt in an electric arc furnace |
DE102009043639A1 (en) | 2009-09-29 | 2011-03-31 | Sms Siemag Aktiengesellschaft | Method and apparatus for controlling the production of a foamed slag in a metallic melt |
DE102010004983A1 (en) | 2010-01-19 | 2011-07-21 | SMS Siemag Aktiengesellschaft, 40237 | Process for the production of foam slag of a stainless melt in a converter |
DE102010022692A1 (en) | 2010-03-17 | 2011-09-22 | Sms Siemag Ag | Briquette for producing a foamed slag effect in stainless steel EAF technology |
KR101229899B1 (en) * | 2010-12-22 | 2013-02-05 | 주식회사 포스코 | Material for promoting slag forming |
KR101499200B1 (en) * | 2013-06-27 | 2015-03-05 | 현대제철 주식회사 | Furnace |
ES2623457T3 (en) * | 2014-12-17 | 2017-07-11 | Refractory Intellectual Property Gmbh & Co. Kg | Mixture, use of this mixture as well as procedure for conditioning a slag found on molten metal in a metallurgical bucket in the iron and steel metallurgical industry |
CN104726636A (en) * | 2015-03-30 | 2015-06-24 | 山西太钢不锈钢股份有限公司 | Foaming agent for smelting stainless steel employing electric furnace and foaming method for foaming agent |
JP6620781B2 (en) * | 2017-05-15 | 2019-12-18 | Jfeスチール株式会社 | Dust smelting reduction method and reuse method |
CN114317885B (en) * | 2022-01-11 | 2022-11-22 | 安徽工业大学 | Biomass electric furnace foaming agent and preparation method and application method thereof |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3807986A (en) * | 1971-06-09 | 1974-04-30 | Lukens Steel Co | Combination iron and iron oxide briquette and method of using |
US3843767A (en) * | 1972-03-27 | 1974-10-22 | Du Pont | Process for treating fluophosphate ores |
US3925060A (en) * | 1974-09-23 | 1975-12-09 | Timken Co | Compact containing iron oxide and carbon and method for its use in steelmaking |
JPH04131314A (en) * | 1990-09-21 | 1992-05-06 | Nippon Stainless Steel Co Ltd | Method for recovering valuable metal from byproduct at the time of manufacturing stainless steel |
EP0655508B1 (en) | 1993-11-30 | 1998-08-19 | ACCIAI SPECIALI TERNI S.p.a. | Process for using foamed slag in stainless steel production in the electric arc furnace |
FR2753205B1 (en) * | 1996-09-12 | 1998-12-04 | Usinor Sacilor | PROCESS FOR PRODUCING A FOAMING SLAG OVER A STAINLESS STEEL MELTING IN AN ELECTRIC OVEN |
JPH11302712A (en) * | 1998-04-16 | 1999-11-02 | Tetsugen Corp | Reduction dissolution refining method for iron oxide |
SE512757C2 (en) | 1998-09-03 | 2000-05-08 | Uddeholm Technology Ab | Addition of doping agents in the manufacture of steel in arc furnaces, doping agents and their use |
US6214085B1 (en) * | 1999-02-01 | 2001-04-10 | Calderon Energy Company Of Bowling Green, Inc. | Method for direct steelmaking |
LU90409B1 (en) * | 1999-06-25 | 2001-01-02 | Wurth Paul Sa | Proc-d- for optimizing the operation of an electric furnace of the - submerged arc- type |
LU90481B1 (en) | 1999-12-01 | 2001-06-05 | Wurth Paul Sa | Post-treatment process for metallurgical slag |
-
2003
- 2003-05-24 DE DE10323505A patent/DE10323505A1/en not_active Withdrawn
-
2004
- 2004-04-22 TW TW093111178A patent/TWI295690B/en not_active IP Right Cessation
- 2004-04-23 UA UAA200512440A patent/UA84151C2/en unknown
- 2004-04-23 US US10/557,190 patent/US20060260435A1/en not_active Abandoned
- 2004-04-23 EP EP04729075A patent/EP1629126B1/en not_active Expired - Lifetime
- 2004-04-23 CA CA2519728A patent/CA2519728C/en not_active Expired - Fee Related
- 2004-04-23 WO PCT/EP2004/004312 patent/WO2004104232A1/en active Application Filing
- 2004-04-23 RU RU2005140564/02A patent/RU2343208C2/en not_active IP Right Cessation
- 2004-04-23 CN CN201110027012XA patent/CN102061356A/en active Pending
- 2004-04-23 JP JP2006529704A patent/JP4701331B2/en not_active Expired - Fee Related
- 2004-04-23 CN CNA2004800143226A patent/CN1795277A/en active Pending
- 2004-05-20 MY MYPI20041932A patent/MY146471A/en unknown
-
2005
- 2005-07-14 ZA ZA200505659A patent/ZA200505659B/en unknown
- 2005-11-23 KR KR1020057022381A patent/KR101174691B1/en active IP Right Grant
-
2012
- 2012-09-12 US US13/611,671 patent/US20130000446A1/en not_active Abandoned
Also Published As
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KR20060004700A (en) | 2006-01-12 |
CN1795277A (en) | 2006-06-28 |
WO2004104232A1 (en) | 2004-12-02 |
TWI295690B (en) | 2008-04-11 |
CN102061356A (en) | 2011-05-18 |
DE10323505A1 (en) | 2004-12-09 |
US20130000446A1 (en) | 2013-01-03 |
TW200427844A (en) | 2004-12-16 |
CA2519728A1 (en) | 2004-12-02 |
EP1629126A1 (en) | 2006-03-01 |
EP1629126B1 (en) | 2013-03-13 |
KR101174691B1 (en) | 2012-08-17 |
CA2519728C (en) | 2011-06-14 |
WO2004104232A8 (en) | 2006-03-02 |
JP4701331B2 (en) | 2011-06-15 |
US20060260435A1 (en) | 2006-11-23 |
RU2005140564A (en) | 2006-05-10 |
RU2343208C2 (en) | 2009-01-10 |
JP2007501900A (en) | 2007-02-01 |
MY146471A (en) | 2012-08-15 |
UA84151C2 (en) | 2008-09-25 |
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