EP0061011A1 - Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus - Google Patents
Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus Download PDFInfo
- Publication number
- EP0061011A1 EP0061011A1 EP82101427A EP82101427A EP0061011A1 EP 0061011 A1 EP0061011 A1 EP 0061011A1 EP 82101427 A EP82101427 A EP 82101427A EP 82101427 A EP82101427 A EP 82101427A EP 0061011 A1 EP0061011 A1 EP 0061011A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- weight
- calcium oxide
- calcium
- content
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 10
- 239000000161 steel melt Substances 0.000 title claims abstract description 6
- 229910000805 Pig iron Inorganic materials 0.000 title claims description 6
- 230000003009 desulfurizing effect Effects 0.000 title abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000292 calcium oxide Substances 0.000 claims abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 10
- 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 10
- 239000000571 coke Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 239000011575 calcium Substances 0.000 claims description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 239000012803 melt mixture Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 description 7
- 230000023556 desulfurization Effects 0.000 description 7
- 239000000155 melt Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 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
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Definitions
- the present invention relates to a process for the production of desulfurization agents with a content of 1-6% by weight of chemically bound water based on calcium oxide and carbon-containing calcium carbide for pig iron and steel melts.
- the finely divided lime was preferably introduced into the jet of carbide tapped from the furnace. Although the amount of lime that can be introduced into the molten carbide is limited and working with liquid carbide is associated with dangers, it was previously believed in specialist circles that this method could not be dispensed with because it was believed that only a mixture of CaC produced in the melt 2 and Ca0 are best suited for the desulfurization of molten metals. Desulphurization agents based on calcium carbide, which contain substances that release water at the temperature of the molten metal, are already known from DE-AS 22 52 795.
- These agents which are mixtures of commercially available carbide with, for example, Ca (OH) 2 as water-releasing substance and possibly carbon, have the disadvantage that they are mixtures produced by mechanical mixing, in which carbide particles are present separately from Ca (OH) 2 particles , which leads to a higher consumption, uneven and violent gas reactions and a large spread regarding the desulfurization effect when using these products, which makes a targeted use of these agents difficult.
- the solidified block still has an average temperature of more than 400 ° C, preferably between 400 ° C and the solidification temperature of the melt, it is then broken down to grain sizes less than 150 mm and added to the comminuted and still at least 400 ° C hot mixture Calcium oxide in such an amount that the total Ca0 content in the resulting mixture corresponds to the CaO content desired in the end product. So much calcium oxide is preferably added that a total Ca0 content of over 45 to 90% by weight results in the mixture.
- this mixture is then mixed intensively with free carbon and carbonate in the presence of air or nitrogen with a moisture content of 5 to 20 g / m 3 (at 1.013 bar and 273.15 K) at temperatures below 100 ° C., preferably at 10-50 ° C., to particle sizes less than 10 mm, preferably smaller than 0.1 mm, ground.
- the end product contains 0.5 to 8% by weight of free carbon and 0.5 to 20% by weight of carbonates of calcium, magnesium or sodium.
- a calcium carbide-calcium oxide starting melt mixture with a Ca0 content of 20 to 45% by weight is used, which was obtained in a known manner by thermal means from lime and coke.
- a calcium carbide-calcium oxide starting melt mixture with a CaO content of over 45 to 80% by weight is first prepared by adding finely divided calcium oxide to an existing calcium carbide melt which has a calcium oxide content of up to 45% by weight enters a Ca0 content of at most 80% by weight and only then solidifies the whole into a block before breaking it at temperatures above 400 ° C.
- the process according to the invention also has the further advantages, inter alia, that a certain Möller composition is not set in each case to produce the carbide melt and the lime is not finely ground beforehand to a specific grain size must, but that it can be assumed that a carbide block, the CaC 2: CaO weight ratio fluctuate within a very wide range, ie practically any can be, and the lime can also be used in coarse-grained form, for example in a grain size between 8 and 60 mm.
- composition according to the invention is that present on the surface of each grain Ca (OH) 2 close to CaC 2, whereby the desulfurizing very early and is set uniformly in motion. With comparable desulfurization results, smaller amounts of the desulfurization agent are required and more targeted results are possible.
- the block After the block had cooled to an average temperature of about 600 ° C, it was crushed to grain sizes smaller than 150 mm and the carbide, which was still 500 ° C, was covered with so much lime with a grain size of 8 to 60 mm that the resulting mixture contained a total Ca0 content of 50% by weight.
- 850 kg of this mixture were mixed with 100 kg of limestone (grain size less than 1 mm) and 50 kg of coke breeze (grain size less than 3 mm) and with a passage of 1500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C ) milled in a rotary mill with a throughput of 500 kg / h at 50 ° C to grain sizes between 0 and 0.1 mm.
- the product obtained contained 2% by weight of chemically bound water.
- Calcium carbide is produced thermally from lime and coke in a known manner, the lime-coke mixture in the entire Möller being adjusted to a weight ratio of approximately 110:40, which corresponds to a carbide with a CaO content of approximately 45% by weight.
- Ca0 with a grain size of 3-8 mm is added to the tapping jet of this carbide in such an amount that an average content of approx. 80% by weight Ca0 results in the tapping crucible (about 1.2-1.3 t Ca0 per tonne of tapping jet).
- the block is pre-crushed to a grain size of less than 150 mm and as much lime with a grain size of 8 to 60 mm is layered on the hot mixture. that the average Ca0 content is 90% by weight.
- 875 kg of this mixture are mixed with 100 kg of limestone (grain size less than 1 mm) and 25 kg of coke breeze (grain size less than 3 mm) and with passage of 1500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 0 C ) in a rotary mill with a throughput of 500 kg / h at 50 ° C to a grain size smaller than 0.1 mm.
- the product obtained contains 2.5% by weight of chemically bound water.
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)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Manufacture And Refinement Of Metals (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82101427T ATE9596T1 (de) | 1981-03-24 | 1982-02-25 | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3111509 | 1981-03-24 | ||
| DE19813111509 DE3111509A1 (de) | 1981-03-24 | 1981-03-24 | Verfahren zur herstellung von entschwefelungsmitteln fuer roheisen- oder stahlschmelzen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0061011A1 true EP0061011A1 (fr) | 1982-09-29 |
| EP0061011B1 EP0061011B1 (fr) | 1984-09-26 |
Family
ID=6128139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82101427A Expired EP0061011B1 (fr) | 1981-03-24 | 1982-02-25 | Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4400292A (fr) |
| EP (1) | EP0061011B1 (fr) |
| JP (1) | JPS57169010A (fr) |
| AT (1) | ATE9596T1 (fr) |
| BR (1) | BR8201618A (fr) |
| CA (1) | CA1184384A (fr) |
| DD (1) | DD202183A5 (fr) |
| DE (2) | DE3111509A1 (fr) |
| ES (1) | ES510769A0 (fr) |
| ZA (1) | ZA821939B (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0220522A1 (fr) * | 1985-10-03 | 1987-05-06 | Hoechst Aktiengesellschaft | Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2326539A1 (de) * | 1973-05-24 | 1974-12-12 | Sueddeutsche Kalkstickstoff | Verfahren zur herstellung wasserhaltiger gemische auf basis calciumcarbid fuer die entschwefelung von metallschmelzen |
| DE2236160C3 (de) * | 1971-07-26 | 1975-10-09 | Acieries Reunies De Burbach-Eichdudelange S.A. Arbed, Luxemburg | Mittel zur Entschwefelung von flüssigem Roheisen und Verfahren zu seiner Herstellung |
| DE2252795B2 (de) * | 1972-10-27 | 1977-02-03 | Süddeutsche Kalkstickstoff-Werke AG, 8223 Trostberg | Entschwefelungsmittel fuer metallschmelzen mit wasserabspaltendem zusatz |
| DE2741588A1 (de) * | 1977-09-15 | 1979-03-29 | Sueddeutsche Kalkstickstoff | Mittel zum entschwefeln von eisenschmelzen |
| DE2037758C3 (de) * | 1970-07-30 | 1979-08-02 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen |
| EP0019086A2 (fr) * | 1979-05-19 | 1980-11-26 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus |
| EP0031534A1 (fr) * | 1979-12-29 | 1981-07-08 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus |
| EP0031552A1 (fr) * | 1979-12-29 | 1981-07-08 | Hoechst Aktiengesellschaft | Agent de désulfuration et procédé pour sa fabrication |
| EP0019087B1 (fr) * | 1979-05-14 | 1983-07-20 | Hoechst Aktiengesellschaft | Matières de désulfuration pour bains de fonte et d'acier ainsi que procédé pour leur fabrication |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1408188A1 (de) * | 1959-12-19 | 1968-10-17 | Hoesch Ag | Verfahren zur Entschwefelung von Roheisenbaedern |
| AT264560B (de) * | 1966-08-25 | 1968-09-10 | Gustav Dipl Ing Wolfram | Basisches Stahlherstellungsverfahren |
| IT1047585B (it) * | 1975-09-26 | 1980-10-20 | Centro Speriment Metallurg | Perfezionamento alla disossidazione e desolforazione dell acciaio |
-
1981
- 1981-03-24 DE DE19813111509 patent/DE3111509A1/de not_active Withdrawn
-
1982
- 1982-02-25 EP EP82101427A patent/EP0061011B1/fr not_active Expired
- 1982-02-25 AT AT82101427T patent/ATE9596T1/de active
- 1982-02-25 DE DE8282101427T patent/DE3260809D1/de not_active Expired
- 1982-03-16 CA CA000398465A patent/CA1184384A/fr not_active Expired
- 1982-03-18 US US06/359,229 patent/US4400292A/en not_active Expired - Fee Related
- 1982-03-19 DD DD82238308A patent/DD202183A5/de unknown
- 1982-03-23 ZA ZA821939A patent/ZA821939B/xx unknown
- 1982-03-23 BR BR8201618A patent/BR8201618A/pt unknown
- 1982-03-24 JP JP57045746A patent/JPS57169010A/ja active Granted
- 1982-03-24 ES ES510769A patent/ES510769A0/es active Granted
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2037758C3 (de) * | 1970-07-30 | 1979-08-02 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Herstellung von CaIciumkarbid zur Entschwefelung von Metallschmelzen |
| DE2236160C3 (de) * | 1971-07-26 | 1975-10-09 | Acieries Reunies De Burbach-Eichdudelange S.A. Arbed, Luxemburg | Mittel zur Entschwefelung von flüssigem Roheisen und Verfahren zu seiner Herstellung |
| DE2252795B2 (de) * | 1972-10-27 | 1977-02-03 | Süddeutsche Kalkstickstoff-Werke AG, 8223 Trostberg | Entschwefelungsmittel fuer metallschmelzen mit wasserabspaltendem zusatz |
| DE2326539A1 (de) * | 1973-05-24 | 1974-12-12 | Sueddeutsche Kalkstickstoff | Verfahren zur herstellung wasserhaltiger gemische auf basis calciumcarbid fuer die entschwefelung von metallschmelzen |
| DE2741588A1 (de) * | 1977-09-15 | 1979-03-29 | Sueddeutsche Kalkstickstoff | Mittel zum entschwefeln von eisenschmelzen |
| EP0019087B1 (fr) * | 1979-05-14 | 1983-07-20 | Hoechst Aktiengesellschaft | Matières de désulfuration pour bains de fonte et d'acier ainsi que procédé pour leur fabrication |
| EP0019086A2 (fr) * | 1979-05-19 | 1980-11-26 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfurisation de fonte ou d'acier fondus |
| EP0031534A1 (fr) * | 1979-12-29 | 1981-07-08 | Hoechst Aktiengesellschaft | Procédé pour la fabrication d'agents de désulfuration de fonte ou d'acier fondus |
| EP0031552A1 (fr) * | 1979-12-29 | 1981-07-08 | Hoechst Aktiengesellschaft | Agent de désulfuration et procédé pour sa fabrication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0220522A1 (fr) * | 1985-10-03 | 1987-05-06 | Hoechst Aktiengesellschaft | Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA821939B (en) | 1983-02-23 |
| CA1184384A (fr) | 1985-03-26 |
| DD202183A5 (de) | 1983-08-31 |
| EP0061011B1 (fr) | 1984-09-26 |
| BR8201618A (pt) | 1983-02-08 |
| DE3260809D1 (en) | 1984-10-31 |
| JPH0135883B2 (fr) | 1989-07-27 |
| ES8302104A1 (es) | 1983-02-01 |
| US4400292A (en) | 1983-08-23 |
| DE3111509A1 (de) | 1982-10-07 |
| ATE9596T1 (de) | 1984-10-15 |
| ES510769A0 (es) | 1983-02-01 |
| JPS57169010A (en) | 1982-10-18 |
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