EP0019086B1 - 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
- EP0019086B1 EP0019086B1 EP80101984A EP80101984A EP0019086B1 EP 0019086 B1 EP0019086 B1 EP 0019086B1 EP 80101984 A EP80101984 A EP 80101984A EP 80101984 A EP80101984 A EP 80101984A EP 0019086 B1 EP0019086 B1 EP 0019086B1
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- European Patent Office
- Prior art keywords
- cao
- weight
- calcium oxide
- mixture
- 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.)
- Expired
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 9
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 8
- 239000000161 steel melt Substances 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims description 12
- 229910000805 Pig iron Inorganic materials 0.000 title description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000292 calcium oxide Substances 0.000 claims abstract description 38
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 24
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 24
- 239000004571 lime Substances 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 19
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000007717 exclusion Effects 0.000 claims abstract description 10
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 9
- 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 9
- 239000012803 melt mixture Substances 0.000 claims abstract description 8
- 239000000571 coke Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims abstract 3
- 239000011236 particulate material Substances 0.000 claims abstract 3
- 239000012467 final product Substances 0.000 claims abstract 2
- 239000000047 product Substances 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000155 melt Substances 0.000 description 6
- 239000007795 chemical reaction product Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007873 sieving Methods 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 method for producing desulfurizing agents 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 CaO are best suited for the desulfurization of metal melts.
- This mixture is then milled with intensive mixing and with the exclusion of moisture at temperatures above 100 ° C. to grain sizes less than 10 mm, preferably less than 10 ⁇ m, and the milled product, likewise with the exclusion of moisture, is cooled.
- a carbide / lime 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 carbide / lime starting melt mixture with a CaO content of more than 45 to 80% by weight is first produced by finely dividing into a carbide melt which has a lime content of up to 45% by weight Enter lime up to a CaO content of up to 80% by weight and only then allow the whole to solidify 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 is not previously adjusted to a specific grain size must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio can fluctuate 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.
- 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 CaO content of 50% by weight.
- the mixture was then ground with the exclusion of moisture at a temperature of 100 ° C. to particle sizes between 0 and 100 ⁇ m, and the ground product was cooled to room temperature with the exclusion of moisture.
- Carbide is thermally produced in a known manner from lime and coke, 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.
- CaO 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 CaO results in the tapping crucible (about 1.2-1.3 t Ca0 per 1 t 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 8-60 mm is layered on the hot mixture that the average Ca0 content is 90% by weight.
- the mixture is then ground to a grain size of less than 100 ⁇ m with exclusion of moisture at a temperature above 100 ° C., and the ground product is cooled to room temperature with the exclusion of moisture.
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- 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)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Entschweflungsmitteln auf Basis von Calciumoxid enthaltendem Calciumcarbid für Roheisen- und Stahlschmelzen.The present invention relates to a method for producing desulfurizing agents 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 Nr. 1160457, DE-PS Nr. 2037758).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 No. 1160457, DE-PS No. 2037758).
Bei der Herstellung solcher Entschweflungsmittel 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 manufacture of such desulfurizing agents, the usual procedure so far was to add the required amount of finely divided lime to the 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 CaO sei für eine Entschweflung von Metallschmelzen am besten geeignet.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 CaO are best suited for the desulfurization of metal melts.
In die gleiche Richtung weist daher auch der ältere Vorschlag, zur Herstellung eines Entschweflungsmittels auf der Basis von Carbid mit einem CaO-Gehalt von mehr als 45 bis 80 Gew.%, gemäss der EP-A1 Nr. 0019087, in eine in üblicher Weise erzeugte Carbidschmelze, welche bereits einen CaO-Gehalt bis zu 45 Gew.% aufweist, feinteiliges CaO in einem Überschuss von 3 bis 15 Gew.%, bezogen auf die im Endprodukt gewünschte Menge, einzutragen. Dann muss die erhaltene Mischung unter Erstarren auf Temperaturen von 350 bis 450° C abgekühlt und bei diesen Temperaturen auf Korngrössen kleiner als 150 mm vorgebrochen werden. Der dabei zwangsläufig anfallende Kornanteil kleiner als 4 mm wird dann vom verbleibenden Produkt abgetrennt und letzteres unter Feuchtigkeitsausschluss durch Brechen und Mahlen auf Korngrössen kleiner als 10 mm zerkleinert. Eine solche Arbeitsweise führt durch die Zugabe eines Überschusses an CaO in die Carbidschmelze und Absieben des Feinkornanteils unter 4 mm zu nicht immer exakt reproduzierbaren CaO-Gehalten in den Endprodukten.The older proposal, therefore, for producing a desulfurization agent based on carbide with a CaO content of more than 45 to 80% by weight, according to EP-A1 No. 0019087, in a conventional manner also points in the same direction Carbide melt, which already has a CaO content of up to 45% by weight, of finely divided CaO in an excess of 3 to 15% by weight, based on the amount desired in the end product. The mixture obtained then has to be solidified to temperatures of 350 to 450 ° C. and has to be pre-broken at these temperatures to grain sizes smaller than 150 mm. The inevitably occurring grain fraction smaller than 4 mm is then separated from the remaining product and the latter is crushed to a grain size smaller than 10 mm with exclusion of moisture by breaking and grinding. Such a procedure leads to the addition of an excess of CaO into the carbide melt and sieving of the fine grain fraction below 4 mm to CaO contents in the end products which are not always exactly reproducible.
Überraschenderweise wurde nun gefunden, dass man die Nachteile der bekannten Arbeitsweisen vermeiden und ein hochwirksames Entschweflungsmittel für Roheisen- und Stahlschmelzen erhalten kann, wenn man zunächst auf thermischem Wege aus Kalk und Koks ein Carbid/ Kalk-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 Kalk in einer solchen Menge auf, dass der sich in der entstehenden Mischung ergebende Gesamtgehalt an CaO dem im Endprodukt gewünschten CaO-Gehalt entspricht. Vorzugsweise gibt man so viel Kalk auf, dass sich in der Mischung ein Gesamtgehalt an CaO von über 45 bis 90 Gew.% ergibt. Anschliessend wird dann diese Mischung unter intensiver Vermengung und unter Feuchtigkeitsausschluss bei Temperaturen oberhalb 100° C auf Korngrössen kleiner als 10 mm, vorzugsweise kleiner als 10 µm, gemahlen, und das gemahlene Produkt, ebenfalls unter Feuchtigkeits ausschluss, abgekühlt.Surprisingly, it has now been found that the disadvantages of the known working methods can be avoided and a highly effective desulfurizing agent for pig iron and steel melts can be obtained if a carbide / lime starting melt mixture with any CaO content of 20 to is first obtained thermally from lime and coke 80% generated, which is allowed to solidify into a block by allowing it to cool. 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 smaller than 150 mm and put on the crushed and still at least 400 ° C hot Mix lime in such an amount that the total CaO content in the resulting mixture corresponds to the CaO content desired in the end product. It is preferable to add enough lime to give a total CaO content of over 45 to 90% by weight in the mixture. This mixture is then milled with intensive mixing and with the exclusion of moisture at temperatures above 100 ° C. to grain sizes less than 10 mm, preferably less than 10 μm, and the milled product, likewise with the exclusion of moisture, is cooled.
Vorzugsweise setzt man ein Carbid/Kalk-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 zunächst ein Carbid/Kalk-Ausgangsschmelzgemisch mit einem CaO-Gehalt von über 45 bis 80 Gew.% herstellt, indem man in eine vorliegende Carbidschmelze, die einen Kalkgehalt bis zu 45 Gew.% aufweist, feinteiligen Kalk 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 carbide / lime 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 a carbide / lime starting melt mixture with a CaO content of more than 45 to 80% by weight is first produced by finely dividing into a carbide melt which has a lime content of up to 45% by weight Enter lime up to a CaO content of up to 80% by weight and only then allow the whole to solidify 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-Gewichtsverhä)tnis 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 mixing 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 is not previously adjusted to a specific grain size must be finely ground, but that it can be assumed that a carbide block whose CaC 2 : CaO weight ratio can fluctuate 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.
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 the appropriate 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 Korngrössen 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 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 CaO content of 50% by weight.
Anschliessend wurde die Mischung unter Feuchtigkeitsausschluss bei einer Temperatur von 100° C auf Korngrössen zwischen 0 und 100 µm gemahlen, und das gemahlene Produkt unter Feuchtigkeitsausschluss auf Raumtemperatur abgekühlt.The mixture was then ground with the exclusion of moisture at a temperature of 100 ° C. to particle sizes between 0 and 100 μm, and the ground product was cooled to room temperature with the exclusion of moisture.
Mit 1500 kg von diesem Produkt wurden 300000 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, 300000 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 Carbid 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.Carbide is thermally produced in a known manner from lime and coke, 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 CaO der Körnung 3-8 mm in einer solchen Menge zudosiert, dass sich im Abstichtiegel ein Durchschnittsgehalt von ca. 80 Gew.% CaO ergibt (auf 1 t Abstichstrahl etwa 1,2-1,3 t Ca0).CaO 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 CaO results in the tapping crucible (about 1.2-1.3 t Ca0 per 1 t tapping jet).
Nach dem Abkühlen des Tiegels auf eine Durchschnittstemperatur von nicht unter 600° C, was bereits nach 4 h der Fall ist, wird der Block auf eine Korngrösse kleiner als 150 mm vorgebrochen und auf das heisse Gemisch so viel Kalk der Körnung 8-60 mm geschichtet, dass der Durchschnitts-Ca0-Gehalt 90 Gew.% beträgt. Anschliessend wird unter Feuchtigkeitsausschluss bei einer Temperatur oberhalb 100° C auf eine Korngrösse kleiner als 100 µm gemahlen, und das gemahlene Produkt unter Feuchtigkeitsausschluss auf Zimmertemperatur abgekühlt.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-crushed to a grain size of less than 150 mm and as much lime with a grain size of 8-60 mm is layered on the hot mixture that the average Ca0 content is 90% by weight. The mixture is then ground to a grain size of less than 100 μm with exclusion of moisture at a temperature above 100 ° C., and the ground product is cooled to room temperature with the exclusion of moisture.
Mit diesem Gemisch werden, bezogen auf den Carbidgehalt, die gleichen Entschwefelungsergebnisse erzielt, wie im Beispiel 1 geschildert.With this mixture, based on the carbide content, the same desulfurization results are achieved as described in Example 1.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80101984T ATE2092T1 (en) | 1979-05-19 | 1980-04-14 | PROCESS FOR THE MANUFACTURE OF DESULPHURIZING AGENTS FOR MELTED PIG IRON OR STEEL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792920353 DE2920353A1 (en) | 1979-05-19 | 1979-05-19 | METHOD FOR THE PRODUCTION OF DEHANIZING AGENTS FOR CRUDE IRON OR STEEL MELT |
| DE2920353 | 1979-05-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0019086A2 EP0019086A2 (en) | 1980-11-26 |
| EP0019086A3 EP0019086A3 (en) | 1981-04-01 |
| EP0019086B1 true EP0019086B1 (en) | 1982-12-22 |
Family
ID=6071196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80101984A Expired EP0019086B1 (en) | 1979-05-19 | 1980-04-14 | Process for producing desulfurizing agents for pig iron or steel melts |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4318822A (en) |
| EP (1) | EP0019086B1 (en) |
| JP (1) | JPS55154519A (en) |
| AT (1) | ATE2092T1 (en) |
| CA (1) | CA1141965A (en) |
| DE (2) | DE2920353A1 (en) |
| ES (1) | ES8101120A1 (en) |
| NO (1) | NO151971C (en) |
| ZA (1) | ZA802943B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107344188A (en) * | 2017-07-28 | 2017-11-14 | 靖西天桂铝业有限公司 | Bauxite washing tail mud dry treatment and comprehensive utilization new technology |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2952686A1 (en) * | 1979-12-29 | 1981-07-02 | Hoechst Ag, 6230 Frankfurt | METHOD FOR THE PRODUCTION OF DESULFURING AGENTS FOR BOD IRON OR STEEL MELT |
| DE3111510A1 (en) * | 1981-03-24 | 1982-10-07 | Hoechst Ag, 6000 Frankfurt | DESULFURATION MIXTURE AND METHOD FOR THE PRODUCTION THEREOF |
| DE3111509A1 (en) * | 1981-03-24 | 1982-10-07 | Hoechst Ag, 6000 Frankfurt | METHOD FOR THE PRODUCTION OF DESULFURING AGENTS FOR BOD IRON OR STEEL MELT |
| DE3535280A1 (en) * | 1985-10-03 | 1987-04-09 | Hoechst Ag | DESULFURATION MIXTURE FOR METAL MELTS, A METHOD FOR THE PRODUCTION THEREOF AND ITS USE |
| US5002733A (en) * | 1989-07-26 | 1991-03-26 | American Alloys, Inc. | Silicon alloys containing calcium and method of making same |
| US5397379A (en) * | 1993-09-22 | 1995-03-14 | Oglebay Norton Company | Process and additive for the ladle refining of steel |
| US6179895B1 (en) | 1996-12-11 | 2001-01-30 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT264560B (en) * | 1966-08-25 | 1968-09-10 | Gustav Dipl Ing Wolfram | Basic steelmaking process |
| 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 |
| FR2290240A1 (en) * | 1974-11-06 | 1976-06-04 | Unibra Sa | IMPROVEMENTS IN GAS DESULFURATION |
| DE2919324A1 (en) * | 1979-05-14 | 1980-12-04 | Hoechst Ag | DEHANIZER FOR RAW IRON AND STEEL MELTING AND A METHOD FOR THE PRODUCTION THEREOF |
-
1979
- 1979-05-19 DE DE19792920353 patent/DE2920353A1/en not_active Withdrawn
-
1980
- 1980-04-14 AT AT80101984T patent/ATE2092T1/en not_active IP Right Cessation
- 1980-04-14 EP EP80101984A patent/EP0019086B1/en not_active Expired
- 1980-04-14 DE DE8080101984T patent/DE3061404D1/en not_active Expired
- 1980-04-21 CA CA000350242A patent/CA1141965A/en not_active Expired
- 1980-05-09 ES ES491355A patent/ES8101120A1/en not_active Expired
- 1980-05-14 US US06/149,745 patent/US4318822A/en not_active Expired - Lifetime
- 1980-05-16 NO NO801468A patent/NO151971C/en unknown
- 1980-05-16 ZA ZA00802943A patent/ZA802943B/en unknown
- 1980-05-19 JP JP6545180A patent/JPS55154519A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107344188A (en) * | 2017-07-28 | 2017-11-14 | 靖西天桂铝业有限公司 | Bauxite washing tail mud dry treatment and comprehensive utilization new technology |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE2092T1 (en) | 1983-01-15 |
| NO151971C (en) | 1985-07-10 |
| DE3061404D1 (en) | 1983-01-27 |
| ES491355A0 (en) | 1980-12-16 |
| EP0019086A2 (en) | 1980-11-26 |
| EP0019086A3 (en) | 1981-04-01 |
| JPS6353245B2 (en) | 1988-10-21 |
| JPS55154519A (en) | 1980-12-02 |
| US4318822A (en) | 1982-03-09 |
| CA1141965A (en) | 1983-03-01 |
| NO151971B (en) | 1985-04-01 |
| DE2920353A1 (en) | 1980-11-27 |
| ES8101120A1 (en) | 1980-12-16 |
| ZA802943B (en) | 1981-06-24 |
| NO801468L (en) | 1980-11-20 |
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