EP0220522B1 - Entschwefelungsgemisch für Metallschmelzen, ein Verfahren zu seiner Herstellung und seine Verwendung - Google Patents
Entschwefelungsgemisch für Metallschmelzen, ein Verfahren zu seiner Herstellung und seine Verwendung Download PDFInfo
- Publication number
- EP0220522B1 EP0220522B1 EP86113501A EP86113501A EP0220522B1 EP 0220522 B1 EP0220522 B1 EP 0220522B1 EP 86113501 A EP86113501 A EP 86113501A EP 86113501 A EP86113501 A EP 86113501A EP 0220522 B1 EP0220522 B1 EP 0220522B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- mixture
- percent
- desulfurization
- calcium
- 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.)
- Expired
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 title claims abstract description 12
- 239000000155 melt Substances 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 17
- 230000003009 desulfurizing effect Effects 0.000 title abstract description 4
- 238000004519 manufacturing process Methods 0.000 title description 10
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 15
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000292 calcium oxide Substances 0.000 claims abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- -1 alkaline earth metal carbonates Chemical class 0.000 claims abstract description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 29
- 230000023556 desulfurization Effects 0.000 claims description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000008240 homogeneous mixture Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910014813 CaC2 Inorganic materials 0.000 claims 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000470 constituent Substances 0.000 abstract 2
- 229910000288 alkali metal carbonate Inorganic materials 0.000 abstract 1
- 150000008041 alkali metal carbonates Chemical class 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000805 Pig iron Inorganic materials 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 239000010436 fluorite Substances 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000009189 diving Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000161 steel melt Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241000836430 Hilda Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000012803 melt mixture Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
Definitions
- the present invention relates to a method for producing a desulfurization mixture for molten metals based on calcium carbide.
- DE-PS 20 37 758 describes a special calcium carbide in which a mixture of quicklime and fluorspar is introduced into the calcium carbide melt and then the solidified calcium carbide is crushed.
- the disadvantage of this process was that only about 2/3 of the fluorine used remained in the melt.
- DE-PS-26 42 838 describes a process for desulfurizing steel, in which a mixture of calcium carbide with 5 to 25 percent by weight calcium fluoride is added to the metal melt under reduced pressure. It has been shown that this mixture is not suitable for dosing via a submersible lance, since caking occurs in the lance during the blowing process. In addition, slag incrustations form on the pan walls. This desulfurization mixture can be used successfully if there is no slag on the metal bath at first.
- EP-A-61 011 describes a process for the production of desulfurization agents for pig iron or steel melts, in which a calcium carbide-calcium oxide melt mixture is ground together with free carbon and carbonate in the presence of moist air or nitrogen. With this desulfurization mixture, the desulfurization reaction is started very early and evenly, and a more targeted desulfurization result is made possible with lower application quantities.
- the object of the present invention is to provide a method for producing a desulfurization mixture with a high degree of desulfurization, which can be produced without the formation of fluoride-containing exhaust gases and which, when used, develops only low fluoride-containing emissions and forms a crumbly slag layer.
- the content of pure CaC 2 in the carbide furnace is set, or the content of pure CaC 2 in the liquid phase in the crucible is adjusted by lean with quicklime or the content of pure CaC 2 in the carbide furnace is rough adjusted and then finally adjusted in the liquid phase in the crucible by adding quicklime.
- the desulfurization mixture according to the invention can contain up to 30 percent by weight of alkali carbonate, preferably in the form of anhydrous soda.
- the grinding process in particular the grinding time, is of great importance for the production of an optimal mixture with regard to flowability and desulfurization.
- the desulfurization mixture does not cause caking, neither in the lance nor in its feed pipes. It has also been shown that when the desulfurization mixture is used, there is no slag encrustation on the metal pan wall. The emission of undesired fluoride emissions during the desulfurization process is significantly lower compared to a calcium carbide / calcium fluoride mixture produced in the usual ways.
- the sulfur content was reduced from 0.024 to 0.0025 percent S.
- the sulfur content was reduced from 0.025 to 0.0007 percent S.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT86113501T ATE48652T1 (de) | 1985-10-03 | 1986-10-01 | Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3535280 | 1985-10-03 | ||
| DE19853535280 DE3535280A1 (de) | 1985-10-03 | 1985-10-03 | Entschwefelungsgemisch fuer metallschmelzen, ein verfahren zu seiner herstellung und seine verwendung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0220522A1 EP0220522A1 (de) | 1987-05-06 |
| EP0220522B1 true EP0220522B1 (de) | 1989-12-13 |
Family
ID=6282637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86113501A Expired EP0220522B1 (de) | 1985-10-03 | 1986-10-01 | Entschwefelungsgemisch für Metallschmelzen, ein Verfahren zu seiner Herstellung und seine Verwendung |
Country Status (9)
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8606249A (pt) * | 1985-12-17 | 1987-09-29 | Sueddeutsche Kalkstickstoff | Composicao finamente granulada para a dessulfuracao de ferro fundido e processo para sua preparacao |
| US4853033A (en) * | 1988-06-29 | 1989-08-01 | Electric Power Research Institute | Method of desulfurizing molten metal in a plasma fired cupola |
| US4941914A (en) * | 1989-05-18 | 1990-07-17 | Elkem Metals Company | Desulfurization agent |
| NO179080C (no) * | 1989-05-18 | 1996-07-31 | Elkem Metals | Avsvovlingsmiddel og fremgangsmåte for fremstilling av avsvovlingsmiddel |
| FR2679256B1 (fr) * | 1991-07-18 | 1994-08-12 | Pechiney Electrometallurgie | Desulfurant pour fonte liquide a base de carbure de calcium agglomere. |
| EP0511121B1 (fr) * | 1991-04-02 | 1996-09-11 | Pechiney Electrometallurgie | Désulfurant pour fonte constitué de carbure de calcium et de liant organique |
| DE4206091C2 (de) * | 1992-02-27 | 1994-09-22 | Anton Dr More | Verfahren zur Entschwefelung von Eisenschmelzen bei minimalem Schlacke-Anfall und eine dafür geeignete Vorrichtung |
| AT406690B (de) * | 1994-12-09 | 2000-07-25 | Donau Chemie Ag | Mittel zur behandlung von roheisen- und gusseisenschmelzen zum zweck der entschwefelung |
| PL213251B1 (pl) | 2009-02-02 | 2013-02-28 | Akad Gorniczo Hutnicza | Sposób wytwarzania mieszanki zuzlotwórczej dla pozapiecowej rafinacji stali w kadzi lub w piecu kadziowym |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031881B2 (ja) * | 1977-03-31 | 1985-07-25 | 日本カーバイド工業株式会社 | 溶銑脱硫用組成物 |
| JPS55110712A (en) * | 1979-02-15 | 1980-08-26 | Kawasaki Steel Corp | Desulfurizing agent for blowing-in |
| GB2049736B (en) * | 1979-04-19 | 1983-02-16 | Foseco Int | Desulphurisation of metals |
| DE2920353A1 (de) * | 1979-05-19 | 1980-11-27 | Hoechst Ag | Verfahren zur herstellung von entschweflungsmitteln fuer roheisen- oder stahlschmelzen |
| JPS5770219A (en) * | 1980-10-21 | 1982-04-30 | Nisshin Steel Co Ltd | Method for dephosphorizing, desulfurizing and denitrifying iron alloy |
| DE3111509A1 (de) * | 1981-03-24 | 1982-10-07 | Hoechst Ag, 6000 Frankfurt | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen |
| DE3168626D1 (en) * | 1981-07-27 | 1985-03-14 | Thyssen Ag | Process for lowering the iron content of slags rich in cao formed in the course of the desulphurisation of pig iron |
| US4541867A (en) * | 1984-03-20 | 1985-09-17 | Amax Inc. | Varnish-bonded carbon-coated magnesium and aluminum granules |
-
1985
- 1985-10-03 DE DE19853535280 patent/DE3535280A1/de not_active Withdrawn
-
1986
- 1986-09-08 IN IN721/MAS/86A patent/IN167748B/en unknown
- 1986-09-19 US US06/909,766 patent/US4687512A/en not_active Expired - Lifetime
- 1986-10-01 ES ES86113501T patent/ES2012038B3/es not_active Expired - Lifetime
- 1986-10-01 DD DD86294888A patent/DD249922A5/de not_active IP Right Cessation
- 1986-10-01 AT AT86113501T patent/ATE48652T1/de not_active IP Right Cessation
- 1986-10-01 EP EP86113501A patent/EP0220522B1/de not_active Expired
- 1986-10-01 DE DE8686113501T patent/DE3667493D1/de not_active Expired - Fee Related
- 1986-10-02 JP JP61233405A patent/JPH0733534B2/ja not_active Expired - Lifetime
- 1986-10-02 PL PL1986261682A patent/PL146624B1/pl unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE48652T1 (de) | 1989-12-15 |
| PL261682A1 (en) | 1987-09-07 |
| JPH0733534B2 (ja) | 1995-04-12 |
| IN167748B (enrdf_load_stackoverflow) | 1990-12-15 |
| ES2012038B3 (es) | 1990-03-01 |
| JPS6286108A (ja) | 1987-04-20 |
| PL146624B1 (en) | 1989-02-28 |
| DE3535280A1 (de) | 1987-04-09 |
| EP0220522A1 (de) | 1987-05-06 |
| DE3667493D1 (de) | 1990-01-18 |
| DD249922A5 (de) | 1987-09-23 |
| US4687512A (en) | 1987-08-18 |
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