EP0031534A1 - Process for producing desulfurizing agents for pig iron or steel melts - Google Patents
Process for producing desulfurizing agents for pig iron or steel melts Download PDFInfo
- Publication number
- EP0031534A1 EP0031534A1 EP80107915A EP80107915A EP0031534A1 EP 0031534 A1 EP0031534 A1 EP 0031534A1 EP 80107915 A EP80107915 A EP 80107915A EP 80107915 A EP80107915 A EP 80107915A EP 0031534 A1 EP0031534 A1 EP 0031534A1
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- European Patent Office
- Prior art keywords
- mixture
- content
- weight
- calcium oxide
- cao
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 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 37
- 239000000203 mixture Substances 0.000 claims abstract description 27
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 15
- 239000004571 lime Substances 0.000 claims description 15
- 239000011575 calcium Substances 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000012803 melt mixture Substances 0.000 claims description 5
- 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 7
- 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
- 239000000155 melt Substances 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000047 product 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
- 238000001816 cooling 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
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur 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
-
- 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-containing calcium carbide for pig iron and steel melts.
- lime calcium carbide
- lime calcium oxide
- 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 dangerous, it was previously thought 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 metal melts.
- Desulphurization agents based on calcium carbide which contain substances which 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 a water-releasing substance, have the disadvantage that they are mixtures produced by mechanical mixing, in which carbide particles are present separately from Ca (OH) 2 particles, which in use of these products leads to a higher consumption, uneven and violent gas reactions and a large spread regarding the desulfurization effect, which makes a targeted use of these agents difficult.
- a calcium carbide-calcium oxide starting melt mixture with a CaO content of 20 to 45% by weight which was obtained in a known manner from lime and coke by thermal means.
- a calcium carbide-calcium oxide starting melt mixture with a CaO content of over 45 to 80% by weight is produced by adding finely divided calcium oxide to an existing calcium carbide melt which has a calcium oxide content of up to 45% by weight to a CaO content of up to 80% by weight and only then solidify the whole thing 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 that the lime does not have a specific grain size beforehand must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio fluctuates within a very wide range, ie can be practically arbitrary, and the lime also in coarse-grained form, for example in a grain size between 8 and 60 mm, can be used.
- composition according to the invention is that present on the surface of each grain Ca (OH) 2 close to CaC 2, which starts the desulfurization reaction very early and evenly. 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 below 150 mm and the 500 ° C hot carbide was covered with so much lime with a grain size of 8 to 60 mm that the layer resulting mixture contained a total CaO content of 50% by weight.
- the mixture was passed through with 1500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to particle sizes between 0 and 100 / around ground.
- 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-broken 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 CaO content is 90% by weight.
- the mixture is then milled by passing 1500 m 3 / h air having a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to a particle size of less than 100 / um .
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Coating With Molten Metal (AREA)
- Carbon And Carbon Compounds (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Glass Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Entschwefelungsmitteln mit einem Gehalt von 1 - 6 Gew% an chemisch gebundenem Wasser auf Basis von Calciumoxid enthaltendem Calciumcarbid für Roheisen- und Stahlschmelzen.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-containing calcium carbide for pig iron and steel melts.
Es ist allgemein bekannt, Roheisen- und Stahlschmelzen mit Hilfe von Calciumoxid (nachfolgend kurz als Kalk bezeichnet) enthaltendem Calciumcarbid (nachfolgend Carbid genannt) zu entschwefeln (DE-PS 1 160 457, DE-PS 20 37 758).It is generally known to desulfurize pig iron and steel melts with the aid of calcium carbide (hereinafter referred to as lime) containing calcium oxide (hereinafter referred to as lime) (DE-PS 1 160 457, DE-PS 20 37 758).
Bei der Herstellung solcher Entschwefelungsmittel ging man in der Regel bislang so vor, daß man in schmelzflüssiges Carbid die erforderliche Menge an feinteiligem Kalk eintrug, um in der Schmelze eine homogene Mischung zu erzeugen, die man anschließend abkühlen ließ und zerkleinerte.In the production of such desulfurizing agents, the procedure up to now has generally been to add the required amount of finely divided lime to molten carbide in order to produce a homogeneous mixture in the melt, which was then allowed to cool and comminute.
Bevorzugt trug man dabei den feinteiligen Kalk in den Strahl des aus dem Ofen abgestochenen Carbides ein. Obwohl die in Carbidschmelze eintragbare Menge Kalk begrenzt und das Arbeiten mit flüssigem Carbid mit Gefahren verbunden ist, war man in Fachkreisen bisher der Auffassung, auf diese Methode nicht verzichten zu können, da man der Meinung war, nur eine in der Schmelze hergestellte Mischung von CaC2 und Ca0 sei für eine Entschwefelung von Metallschmelzen am besten geeigent.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 dangerous, it was previously thought 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 metal melts.
Entschwefelungsmittel auf Basis von Calciumcarbid., welche Stoffe enthalten, die bei der Temperatur der Metallschmelze Wasser abspalten, sind bereits aus der DE-AS 22 52 795 bekannt. Diese Mittel, welche Mischungen von handelsüblichem Carbid mit beispielsweise Ca(OH)2 als wasserabspaltendem Stoff darstellen, haben den Nachteil, daß sie durch mechanisches Vermischen hergestellte Gemenge sind, in denen Carbidteilchen getrennt neben Ca(OH)2-Teilchen vorliegen, was bei Einsatz dieser Produkte zu einem höheren Verbrauch, ungleichmäßigen und heftigen Gasreaktionen und einer großen Streubreite bezüglich der Entschwefelungswirkung führt, wodurch ein gezielter Einsatz dieser Mittel erschwert wird.Desulphurization agents based on calcium carbide, which contain substances which 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 a water-releasing substance, have the disadvantage that they are mixtures produced by mechanical mixing, in which carbide particles are present separately from Ca (OH) 2 particles, which in use of these products leads to a higher consumption, uneven and violent gas reactions and a large spread regarding the desulfurization effect, which makes a targeted use of these agents difficult.
Überraschenderweise wurde nun gefunden, daß man die Nachteile der bekannten Arbeitsweisen vermeiden und ein hochwirksames Entschwefelungsmittel für Roheisen- und Stahlschmelzen erhalten kann, wenn man zunächst auf thermischem Wege aus Kalk und Koks ein Carbid-Calciumoxid-Ausgangsschmelzgemisch mit einem beliebigen CaO-Gehalt von 20 bis 80 % erzeugt, welches man durch Abkühlenlassen zu einem Block erstarren läßt, Während der erstarrte Block noch eine Durchschnittstemperatur von mehr als 400° C, vorzugsweise zwischen 400° C und der Erstarrungstemperatur der Schmelze aufweist, bricht man ihn dann auf Korngrößen kleiner als 150 mm vor und gibt auf das zerkleinerte und noch mindestens 400° C heiße Gemisch Calciumoxid in einer solchen Menge auf, daß der sich in der entstehenden Mischung ergebende Gesamtgehalt an Ca0 dem im Endprodukt gewünschten CaO-Gehalt entspricht. Vorzugsweise gibt man so viel Calciumoxid auf, daß sich in der Mischung ein Gesamtgehalt an Ca0 von über 45 bis 90 Gew% ergibt. Anschließend wird dann diese Mischung unter intensiver Vermengung und in Gegenwart von Luft oder Stickstoff mit einem Feuchtigkeitsgehalt von 5 bis 20 g/m3 (bei 1,013 bar und 273,15 K) bei Temperaturen unterhalb 100° C, vorzugsweise bei 10 - 50° C, auf Korngrößen kleiner als 10 mm, vorzugsweise kleiner als 100 /um, gemahlen.Surprisingly, it has now been found that the disadvantages of the known procedures can be avoided and a highly effective desulfurizing agent for pig iron and steel melts can be obtained if a carbide-calcium oxide starting molten mixture with any CaO content of 20 to is first obtained thermally from lime and coke 80% generated, which is allowed to solidify by cooling to a block, while 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 before and on the crushed and still at least 400 ° C hot mixture of calcium oxide in such an amount that the resulting total Ca0 content in the resulting mixture corresponds to the desired CaO content 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. Then this mixture is then mixed vigorously and 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 mm smaller ° C, to particle sizes than 10, preferably less than 100 / um, milled.
Vorzugsweise setzt man ein Calciumcarbid-Calciumoxid-Ausgangsschmelzgemisch mit einem CaO-Gehalt von 20 bis 45 Gew% ein, das in bekannter Weise auf thermischem Wege aus Kalk und Koks gewonnen wurde. Man kann aber auch so verfahren, daß man zunsächt ein Calciumcarbid-Calciumoxid-Ausgangsschmelzgemisch mit einem CaO-Gehalt von über 45 bis 80 Gew% herstellt, indem man in eine vorliegende Calciumcarbidschmelze, die einen Calciumoxidgehalt bis zu 45 Gew% aufweist, feinteiliges Calciumoxid bis zu einem CaO-Gehalt von maximal bis zu 80 Gew/ einträgt und erst dann das Ganze zu einem Block erstarren läßt, bevor man diesen bei Temperaturen oberhalb 400° C vorbricht.It is preferable to use a calcium carbide-calcium oxide starting melt mixture with a CaO content of 20 to 45% by weight, which was obtained in a known manner from lime and coke by thermal means. However, one can also proceed in such a way that first of all a calcium carbide-calcium oxide starting melt mixture with a CaO content of over 45 to 80% by weight is produced by adding finely divided calcium oxide to an existing calcium carbide melt which has a calcium oxide content of up to 45% by weight to a CaO content of up to 80% by weight and only then solidify the whole thing into a block before breaking it at temperatures above 400 ° C.
Außer daß das Vermischen des Kalkes mit einer Carbidschmelze und den damit verbundenen Schwierigkeiten vermieden werden kann, besitzt das erfindungsgemäße Verfahren u. a. auch die weiteren Vorteile, daß zur Erzeugung der Carbidschmelze nicht jeweils eine bestimmte Möllerzusammensetzung eingestellt, und daß der Kalk vorher nicht auf eine bestimmte Korngröße feingemahlen werden muß, sondern daß von einem Carbidblock ausgegangen werden kann, dessen CaC2 : CaO-Gewichtsverhältnis innerhalb eines sehr weiten Bereiches schwanken, d. h. praktisch beliebig sein kann und der Kalk auch in grobkörniger Form, beispielsweise in einer Korngröße zwischen 8 und 60 mm, eingesetzt werden kann.In addition to the fact that the mixing of the lime with a carbide melt and the difficulties associated with it can be avoided, 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 that the lime does not have a specific grain size beforehand must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio fluctuates within a very wide range, ie can be practically arbitrary, and the lime also in coarse-grained form, for example in a grain size between 8 and 60 mm, can be used.
Ein weiterer Vorteil des erfindungsgemäß hergestellten Mittels besteht darin, daß auf der Oberfläche jedes einzelnen Kornes Ca(OH)2 dicht neben CaC2 vorliegt, wodurch die Entschwefelungsreaktion sehr früh und gleichmäßig in Gang gesetzt wird. Dadurch werden bei vergleichbaren Entschwefelungsergebnissen geringere Mengen des Entschwefelungsmittels benötigt und gezieltere Ergebnisse ermöglicht.A further advantage of the composition according to the invention is that present on the surface of each grain Ca (OH) 2 close to CaC 2, which starts the desulfurization reaction very early and evenly. With comparable desulfurization results, smaller amounts of the desulfurization agent are required and more targeted results are possible.
Aus einer für die Herstellung von technischem Carbid üblichen Schmelze mit einem CaC2-Gehalt von 80 Gew% und CaO-Gehalt von 20 Gew% wurde in einem Tiegel durch Abkühlenlassen dieser Schmelze in bekannter Weise ein Carbidblock entsprechender Zusammensetzung erzeugt.From a melt customary for the production of technical carbide with a CaC 2 content of 80% by weight and a CaO content of 20% by weight, a carbide block of corresponding composition was produced in a crucible in a known manner by allowing this melt to cool.
Nachdem sich der Block auf eine Durchschnittstemperatur von etwa 600° C abgekühlt hatte, wurde er auf Korngrö-Ben kleiner als 150 mm vorgebrochen und das noch 500° C heiße Carbid mit so viel Kalk einer Korngröße von 8 bis 60 mm überschichtet, daß die sich ergebende Mischung einen CaO-Gehalt von insgesamt 50 Gew% enthielt.After the block had cooled to an average temperature of about 600 ° C, it was crushed to grain sizes below 150 mm and the 500 ° C hot carbide was covered with so much lime with a grain size of 8 to 60 mm that the layer resulting mixture contained a total CaO content of 50% by weight.
Anschließend wurde die Mischung unter Durchleiten von 1500 m3/h Luft mit einem Feuchtigkeitsgehalt von 10 g/m3 (bei 15° C) in einer Rotationsmühle mit einem Durchsatz von 500 kg/h bei 50° C auf Korngrößen zwischen 0 und 100 /um gemahlen.Subsequently, the mixture was passed through with 1500 m 3 / h of air with a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to particle sizes between 0 and 100 / around ground.
Mit 1500 kg von diesem Produkt wurden 300 000 kg einer Roheisenschmelze, die 0,03 Gew% Schwefel enthielt, in bekannter Weise entschwefelt. Der S-Gehalt des behandelten Eisens betrug weniger als 0,005 Gew%.With 1500 kg of this product, 300,000 kg of a pig iron melt containing 0.03% by weight of sulfur were desulfurized in a known manner. The S content of the treated iron was less than 0.005% by weight.
In bekannter Weise wird aus Kalk und Koks Calciumcarbid thermisch hergestellt, wobei die Kalk-Koks-Mischung im gesamten Möller auf ein Gewichtsverhältnis von etwa 110 : 40 eingestellt wird, was einem Carbid mit einem CaO-Gehalt von etwa 45 Gew% entspricht.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.
Dem Abstichstrahl dieses Carbides wird Ca0 der Körnung 3 - 8 mm in einer solchen Menge zudosiert, daß sich im Abstichtiegel ein Durchschnittsgehalt von ca. 80 Gew% Ca0 ergibt (auf 1 Tonne Abstichstrahl etwa 1,2 - 1,3 t Ca0).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).
Nach dem Abkühlen des Tiegels auf eine Durchschnittstemperatur von nicht unter 600° C, was bereits nach 4 Stunden der Fall ist, wird der Block auf eine Korngröße kleiner als 150 mm vorgebrochen und auf das heiße Gemisch so viel Kalk der Körnung 8 bis 60 mm geschichtet, daß der Durchschnitts-CaO-Gehalt 90 Gew% beträgt. Anschließend wird unter Durchleiten von 1500 m3/h Luft mit einem Feuchtigkeitsgehalt von 10 g/m3 (bei 15° C) in einer Rotationsmühle mit einem Durchsatz von 500 kg/h bei 50° C auf eine Korngröße kleiner als 100 /um gemahlen.After the crucible has cooled to an average temperature of not less than 600 ° C, which is already the case after 4 hours, the block is pre-broken 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 CaO content is 90% by weight. The mixture is then milled by passing 1500 m 3 / h air having a moisture content of 10 g / m 3 (at 15 ° C) in a rotary mill with a throughput of 500 kg / h at 50 ° C to a particle size of less than 100 / um .
Mit diesem Gemisch werden, bezogen auf den Calciumcarbidgehalt, die gleichen Entschwefelungsergebnisse erzielt, wie im Beispiel 1 geschildert.With this mixture, based on the calcium carbide content, the same desulfurization results are achieved as described in Example 1.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80107915T ATE9101T1 (en) | 1979-12-29 | 1980-12-15 | PROCESS FOR THE MANUFACTURE OF DESULPHURIZING AGENTS FOR MELTED PIG IRON OR STEEL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2952686 | 1979-12-29 | ||
| DE19792952686 DE2952686A1 (en) | 1979-12-29 | 1979-12-29 | METHOD FOR THE PRODUCTION OF DESULFURING AGENTS FOR BOD IRON OR STEEL MELT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0031534A1 true EP0031534A1 (en) | 1981-07-08 |
| EP0031534B1 EP0031534B1 (en) | 1984-08-22 |
Family
ID=6089830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80107915A Expired EP0031534B1 (en) | 1979-12-29 | 1980-12-15 | Process for producing desulfurizing agents for pig iron or steel melts |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4368071A (en) |
| EP (1) | EP0031534B1 (en) |
| JP (1) | JPS5698413A (en) |
| AT (1) | ATE9101T1 (en) |
| AU (1) | AU532989B2 (en) |
| BR (1) | BR8008500A (en) |
| DD (1) | DD155527A5 (en) |
| DE (2) | DE2952686A1 (en) |
| DK (1) | DK151569C (en) |
| ES (1) | ES497685A0 (en) |
| IN (1) | IN153342B (en) |
| MX (1) | MX154954A (en) |
| NO (1) | NO153500C (en) |
| PL (1) | PL125648B1 (en) |
| SU (1) | SU1269739A3 (en) |
| ZA (1) | ZA808064B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0061011A1 (en) * | 1981-03-24 | 1982-09-29 | Hoechst Aktiengesellschaft | Process for producing desulfurizing agents for pig iron or steel melts |
| EP0061012A1 (en) * | 1981-03-24 | 1982-09-29 | Hoechst Aktiengesellschaft | Process for producing desulfurizing agents for pig iron and steel melts |
| EP0031552B1 (en) * | 1979-12-29 | 1984-11-21 | Hoechst Aktiengesellschaft | Desulphurising composition and process for its production |
| EP0184723A1 (en) * | 1984-12-04 | 1986-06-18 | Cyanamid Canada Inc. | Method for treating carbide-based desulfurizing reagents for injection into molten iron |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL213251B1 (en) | 2009-02-02 | 2013-02-28 | Akad Gorniczo Hutnicza | Method of manufacturing slag-forming mixture for the secondary steel refining in a ladle or in a ladle furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2252795B2 (en) * | 1972-10-27 | 1977-02-03 | Süddeutsche Kalkstickstoff-Werke AG, 8223 Trostberg | DESULFURIZING AGENT FOR METAL MELTING WITH WATER-RELEASING ADDITIVE |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT264560B (en) * | 1966-08-25 | 1968-09-10 | Gustav Dipl Ing Wolfram | Basic steelmaking process |
| DE1758250B1 (en) * | 1968-04-29 | 1971-10-28 | Sueddeutsche Kalkstickstoff | Agent for the desulphurisation of iron melts |
| DE1919414B2 (en) * | 1969-04-17 | 1977-07-14 | Hoechst Ag, 6000 Frankfurt | METHOD AND DEVICE FOR COOLING CALCIUM CARBIDE PICKED IN VESSELS |
| DE1935567B2 (en) * | 1969-07-12 | 1971-05-13 | Knapsack AG, 5033 Hurth Knapsack | PROCESS FOR THE PRODUCTION OF CALCIUM CARBIDE OF CERTAIN QUALITY |
| DE2037758C3 (en) * | 1970-07-30 | 1979-08-02 | Hoechst Ag, 6000 Frankfurt | Process for the production of calcium carbide for the desulfurization of metal melts |
| DE2326539C3 (en) * | 1973-05-24 | 1975-11-13 | Sueddeutsche Kalkstickstoff-Werke Ag, 8223 Trostberg | Process for the production of a desulphurisation mixture for iron melts from calcium carbide and at least one water-containing substance |
| FR2432550A1 (en) * | 1978-08-04 | 1980-02-29 | Sueddeutsche Kalkstickstoff | PROCESS FOR THE MANUFACTURE OF AN EASILY FLOWABLE PULVERULATED DESULFURIZATION MIXTURE |
| DE2907069C3 (en) * | 1979-02-23 | 1981-12-10 | Krupp Stahl Ag, 4630 Bochum | Agent for the desulfurization of metal melts |
| DE2919324A1 (en) * | 1979-05-14 | 1980-12-04 | Hoechst Ag | DEHANIZER FOR RAW IRON AND STEEL MELTING AND A METHOD FOR THE PRODUCTION THEREOF |
| DE2920353A1 (en) * | 1979-05-19 | 1980-11-27 | Hoechst Ag | METHOD FOR THE PRODUCTION OF DEHANIZING AGENTS FOR CRUDE IRON OR STEEL MELT |
-
1979
- 1979-12-29 DE DE19792952686 patent/DE2952686A1/en not_active Withdrawn
-
1980
- 1980-12-12 ES ES497685A patent/ES497685A0/en active Granted
- 1980-12-15 EP EP80107915A patent/EP0031534B1/en not_active Expired
- 1980-12-15 AT AT80107915T patent/ATE9101T1/en not_active IP Right Cessation
- 1980-12-15 DE DE8080107915T patent/DE3069043D1/en not_active Expired
- 1980-12-23 BR BR8008500A patent/BR8008500A/en unknown
- 1980-12-23 IN IN1420/CAL/80A patent/IN153342B/en unknown
- 1980-12-23 PL PL1980228751A patent/PL125648B1/en unknown
- 1980-12-23 DK DK550880A patent/DK151569C/en not_active IP Right Cessation
- 1980-12-23 NO NO803924A patent/NO153500C/en unknown
- 1980-12-24 AU AU65854/80A patent/AU532989B2/en not_active Ceased
- 1980-12-26 JP JP18417880A patent/JPS5698413A/en active Granted
- 1980-12-26 SU SU803221904A patent/SU1269739A3/en active
- 1980-12-29 ZA ZA00808064A patent/ZA808064B/en unknown
- 1980-12-29 DD DD80226699A patent/DD155527A5/en not_active IP Right Cessation
-
1981
- 1981-01-02 US US06/222,086 patent/US4368071A/en not_active Expired - Fee Related
- 1981-01-05 MX MX185478A patent/MX154954A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2252795B2 (en) * | 1972-10-27 | 1977-02-03 | Süddeutsche Kalkstickstoff-Werke AG, 8223 Trostberg | DESULFURIZING AGENT FOR METAL MELTING WITH WATER-RELEASING ADDITIVE |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0031552B1 (en) * | 1979-12-29 | 1984-11-21 | Hoechst Aktiengesellschaft | Desulphurising composition and process for its production |
| EP0061011A1 (en) * | 1981-03-24 | 1982-09-29 | Hoechst Aktiengesellschaft | Process for producing desulfurizing agents for pig iron or steel melts |
| EP0061012A1 (en) * | 1981-03-24 | 1982-09-29 | Hoechst Aktiengesellschaft | Process for producing desulfurizing agents for pig iron and steel melts |
| EP0184723A1 (en) * | 1984-12-04 | 1986-06-18 | Cyanamid Canada Inc. | Method for treating carbide-based desulfurizing reagents for injection into molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE9101T1 (en) | 1984-09-15 |
| AU6585480A (en) | 1981-07-09 |
| PL228751A1 (en) | 1981-09-04 |
| DK550880A (en) | 1981-06-30 |
| JPS6327406B2 (en) | 1988-06-02 |
| PL125648B1 (en) | 1983-06-30 |
| NO803924L (en) | 1981-06-30 |
| NO153500B (en) | 1985-12-23 |
| BR8008500A (en) | 1981-07-14 |
| SU1269739A3 (en) | 1986-11-07 |
| DD155527A5 (en) | 1982-06-16 |
| EP0031534B1 (en) | 1984-08-22 |
| AU532989B2 (en) | 1983-10-20 |
| ES8200146A1 (en) | 1981-11-01 |
| IN153342B (en) | 1984-07-07 |
| DE3069043D1 (en) | 1984-09-27 |
| DE2952686A1 (en) | 1981-07-02 |
| MX154954A (en) | 1988-01-14 |
| US4368071A (en) | 1983-01-11 |
| NO153500C (en) | 1986-04-02 |
| DK151569C (en) | 1988-05-30 |
| ZA808064B (en) | 1982-01-27 |
| ES497685A0 (en) | 1981-11-01 |
| JPS5698413A (en) | 1981-08-07 |
| DK151569B (en) | 1987-12-14 |
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