EP0511121B1 - Entschwefelungsmittel für Roheisen, aus Calciumkarbid und organisches Bindemittel - Google Patents

Entschwefelungsmittel für Roheisen, aus Calciumkarbid und organisches Bindemittel Download PDF

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EP0511121B1
EP0511121B1 EP92420097A EP92420097A EP0511121B1 EP 0511121 B1 EP0511121 B1 EP 0511121B1 EP 92420097 A EP92420097 A EP 92420097A EP 92420097 A EP92420097 A EP 92420097A EP 0511121 B1 EP0511121 B1 EP 0511121B1
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Prior art keywords
product
binder
desulphurizing
carbide
calcium carbide
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EP92420097A
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French (fr)
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EP0511121A1 (de
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Michel Rebiere
Gilles Nussbaum
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Ferroglobe France SAS
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Pechiney Electrometallurgie SAS
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Priority claimed from FR9104452A external-priority patent/FR2674867B1/fr
Priority claimed from FR9109557A external-priority patent/FR2679256B1/fr
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    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic

Definitions

  • the technical field of the invention is that of the desulphurization of cast irons, whether they are refining, intended for the manufacture of steel, or molding, intended in particular for the manufacture of spheroidal graphite cast irons.
  • the sulfur content must be reduced to 0.005 -0.010%; in the second case, spheroidization is only possible for sulfur contents lower than 0.010%.
  • Most desulphurizing agents are based on two alkaline earths: magnesium and calcium which combine easily with sulfur to give sulphides, forming slags insoluble in cast iron.
  • the excess magnesium is eliminated due to its high vapor pressure at the treatment temperature; excess calcium compounds (lime, carbonate or carbide) are eliminated in the slag.
  • metallic magnesium, calcium carbonate, lime, lime diamide (mixture of Ca carbonate and carbon) and calcium carbide are used, optionally added with products intended to improve the flowability of the mixture or to release gases allowing a good distribution of the desulfurizer in the liquid iron.
  • desulphurizers are, in fact, for refining cast irons, most often injected using a lance, suspended in an inert carrier gas.
  • the grains of desulfurizer are simply poured into the ladle, into the pouring channel or into the bath.
  • the invention relates to a new desulphurizing product essentially containing calcium carbide and a binder as well as its manufacturing process.
  • French patent 1,194,778 (Union Carbide Corporation) describes a process for treating Ca carbide in oil before its use as a desulfurizer.
  • Oil is sprayed onto the carbide, with a particle size between 0.074 and 1.168 mm and brought to 150 ° C. of the oil at a rate of 0.25 to 4% of the weight of carbide.
  • the oil can be mineral (petroleum oil, petrol, kerosene), vegetable (linseed oil) or animal (fish oil). Synthetic waxes or paraffins may also be suitable.
  • German patent DE 3,831,831 (SKW) describes a desulphurizing product composed of a mixture of magnesium and calcium carbide both coated with fine particles of a substance containing silica and an oily-type wetting means .
  • the product is made by mixing in a drum or a frustoconical mixer, carbide and magnesium, with a particle size between 0.1 and 3 mm with 0.5% of the total weight of oil and from 2 to 10% of product to silica base.
  • the oil can be a high viscosity oil of vegetable origin, but also silicone or mineral oil.
  • the silica-based product with a particle size of less than 0.01 mm is, for example, diatom, bentonite or dust from ferro or calcio-silicon furnaces.
  • European patent application EP 0 184 723 (Cyanamid Canada Inc.) describes a process for preparing a desulfurizer based on calcium carbide in which the calcium carbide previously crushed into pieces of 1 to 2 inches in diameter (25 to 50 mm) is then ground, in a ball mill by example, with addition before or during the grinding of a polar organic liquid at a rate of 0.001 to 1% and preferably from 0.01 to 0.5% of the weight of carbide.
  • the organic liquid can be a compound containing up to 10 carbon atoms and preferably an alcohol, an ester, a ketone, an ether, an aldehyde or a halogenated alkane.
  • US Patent 4,533,572 (Neelameggham) describes a process in which metallic granules, in particular of magnesium and aluminum are coated by mixing by mechanical means with a polymerizable oil, are heated to polymerize the oil in varnish and finally heated to a higher temperature to transform, at least partially, the carbon varnish.
  • the coating may contain fine particles of at least one calcium compound.
  • coarse-grained carbide from 300 ⁇ m to 10 mm, for example.
  • the carbide reaction is then very incomplete, which results in high bets: up to 20 kg / t of pig iron instead of 3 kg / t with micronized carbide. Consequently, the use of this coarse carbide is reserved for the molding foundry where the quantities treated are lower. In the steel industry, it would lead to the slagging of slag containing large proportions of unreacted calcium carbide, which would be very harmful to the environment.
  • the problem posed is of the same nature for the desulfurization of refining and molding irons, but the suitable product does not have quite the same characteristics.
  • refining irons we need a product with a fine enough particle size so that it lends itself to pneumatic transport and does not clog the injection lances but not comprising too many ultrafine so that it has good flowability.
  • such a product can have approximately 85% and more of its grains between 25 and 300 ⁇ m.
  • For molding irons we need a coarser grain product, 300 ⁇ m to 10 mm, for example.
  • the object of the invention is to solve this problem by proposing a desulfurizer having the effectiveness of micronized calcium carbide and the particle sizes indicated above. This result is achieved by increasing the particle size of the product by coating or agglomeration of the calcium carbide. micronized with a well-chosen organic binder which will disappear on contact with liquid iron, dispersing the carbide in the bath.
  • the desulfurizer is thus self-dispersing.
  • the invention also provides the process for manufacturing this desulfurizing product.
  • the product for the desulfurization of liquid cast iron based on calcium carbide, object of the invention and more specifically of claim 1, is in the form of grains composed of calcium carbide powder coated or agglomerated using 'A binder consisting either of an organic product having a frank melting temperature between 70 ° C and 100 ° C, or a furfuryl resin whose polymerization temperature is between 40 ° C and 70 ° C.
  • the implementation of the invention comprises two variants according to the envisaged application:
  • the calcium carbide is simply coated, that is to say made up of grains of calcium carbide coated with a first internal layer of a solid binder at room temperature and possibly with a more or less continuous second external layer. finer grains of calcium carbide, also coated. The percentage by weight of grains between 25 and 300 ⁇ m is at least 85%.
  • the process is more complex and comprises the three stages described below.
  • the calcium carbide is agglomerated, that is to say made up of grains with a diameter greater than 0.3 mm, for example comprised between 0.3 and 10 mm, composed of micronized calcium carbide powder agglomerated at 1 using a binder. It is also possible by pushing the grinding, to obtain a particle size comparable to that of the coated carbide, but this unnecessarily complicates the process.
  • calcium carbide is also meant technical calcium carbide which may contain 10 to 15% or more of impurities, especially lime.
  • micronized calcium carbide is meant carbide powder, the totality of the particles of which has a diameter of between a few micrometers and 250 micrometers.
  • the process for manufacturing such a desulfurizer comprises three stages: the first consists in preparing a homogeneous mixture of micronized calcium carbide and a binder consisting of either an organic product having a melting temperature between 70 ° C and 100 ° C, or a furfuryl resin whose polymerization temperature is between 40 ° C and 70 ° C; the second, to agglomerate the mixture thus obtained; the third, to regrind the agglomerated product to bring it to the desired particle size.
  • the second and third steps are not always necessary and constitute a particular mode of implementing the invention.
  • pitches will be used, stearic acid whose melting point is around 70 ° C or fatty esters of glycerol.
  • a product marketed under the name of "RICIDROL” and resulting from the hydrogenation of castor oil is particularly suitable.
  • Castor oil is more than 80% glycerol triricinoleate.
  • Ricinoleic acid is a C 18 acid comprising a double bond and an alcohol function. The hydrogenation of castor oil leads, by saturation of the double bond, to a product composed mainly of glycerol trihydroxystearate which has a clear melting point at 86 ° C.
  • paraffins, mixtures of saturated carbides cannot be suitable, their softening starting from 40 ° C.
  • This resin by polymerizing during the agglomeration treatment, hardens and prevents softening of the desulfurizing product during storage.
  • the carbide-binder mixture can be done either beforehand in a mixer, a kneader or even in the reduction mill of the carbide which constitutes an excellent mixer, either directly in the agglomeration apparatus without pressure such as granulating drum, pelletizing plate, pelletizing cone.
  • the constituents of the mixture are generally brought to a temperature slightly above that of melting the binder so that it is liquid, but that, at the outlet of the agglomeration apparatus, the binder is solidified. This heating is essential when using micronized carbide. This can be avoided by the use of a cylinder press which has both a grinding and agglomeration function and which can be fed directly with coarse carbide and binder at room temperature.
  • the mixture of carbide and binder is done beforehand in a mixer, kneader or grinder, at room temperature. It is also possible to mix the resin and the carbide at the top of the mill used for micronizing the carbide and to add the polymerization catalyst to the mixer. The mixture is then introduced into the agglomerator where it can be slightly heated to accelerate the polymerization of the resin.
  • the amount of binder to be used is between 0.2 and 15% of the weight of carbide or carbide-additions mixture and, preferably, between 0.2 and 10%.
  • the agglomeration operation implements classic techniques which will be chosen according to the nature of the binder and the size and mechanical characteristics of the agglomerate which it is desired to manufacture.
  • the binder-carbide mixture In the case of agglomeration under pressure, and whatever the nature of the binder used, the binder-carbide mixture must be prepared prior to its introduction into the agglomeration apparatus, in a mixer, kneader or grinder.
  • pellets, balls, pellets or extrudates obtained during the agglomeration operation are often coarser than the particle size desired for the desulfurizer. It is therefore necessary to carry out a regrinding, generally summary, followed by sieving, to bring them to this particle size. At the end of this sieving, the parts that are too fine are recycled to the agglomeration, the parts that are too coarse are recycled at the top of the mill.
  • Examples 1, 2, 3, 4 and 5 illustrate the mixing by mixing of calcium carbide with different binders.
  • a summary flow test was made to compare the flowability of the two powders. This test consists in passing a powder sample through a calibrated orifice located at the bottom of a funnel whose half-angle at the top is 20 °. Under well-defined funnel filling conditions, the result is expressed by the diameter of the lowest orifice for which a flow is observed. In the case of carbide powder without hydrogenated castor oil, the flow is observed for a diameter of 22 mm, while in the case of the ground powder with addition of hydrogenated castor oil, the flow is observed for a diameter of 18 mm.
  • the explosion threshold is defined as the minimum energy above which the probability of explosion is> 5% (1 explosion per series of 20 tests). The higher the explosive threshold, the less explosive the powder is.
  • the explosive threshold is 31 mJ (millijoule); with the powder according to the invention, the threshold rises to 213 mJ.
  • micronized calcium carbide supplemented with 7% by weight of hard coal, the mixture having the following particle size: Mesh ( ⁇ m) Refused (%) Cumulative refusal (%) 200 10 10 100 28 38 75 7 45 50 14 59 25 16 75 passing 25
  • This carbide with added coal was mixed in a mixer with 10% of its weight of a furfuryl resin for 10 minutes, at room temperature first, then at 100 ° C to cause the resin to harden.
  • the particle size analysis on the product obtained is as follows:
  • the particle size analysis on the product obtained is as follows: Mesh ( ⁇ m) Refused (%) Cumulative refusal (%) 200 11 11 100 33 44 75 11 55 50 19 74 25 21.5 95.5 passing 4.5
  • the granulometry has also evolved towards coarser grain sizes and in particular, fines smaller than 25 ⁇ m represent only 4.5% instead of 25%.
  • the particle size is however a little finer than with furfuryl resin.
  • the particle size analysis on the product obtained is as follows: Mesh ( ⁇ m) Refused (%) Cumulative refusal (%) 200 38.5 38.5 100 29 67.5 75 9 76.5 50 14 90.5 25 8 98.5 passing 1.5
  • the grain size has further evolved towards coarser grain sizes and, in particular, fines smaller than 25 ⁇ m represent only 1.5% instead of 25%.
  • the particle size is in any case substantially coarser than with furfuryl resin or with only 5% Ricidrol.
  • the conditions for preparing the mixture are the same as those of Example 3, but this time using stearic acid or stearin at 10% by weight of carbide.
  • the particle size analysis on the product obtained is as follows: Mesh ( ⁇ m) Refused (%) Cumulative refusal (%) 200 44 44 100 45 89 75 5.5 94.5 50 4 98.5 25 1 99.5 passing 0.5
  • the grain size has evolved towards even coarser grain sizes and, in particular, fines smaller than 25 ⁇ m represent only 0.5% instead of 25%.
  • the particle size is in any case significantly coarser than with furfuryl resin or with 5% or even 10% of Ricidrol.
  • Example 5 shows that a simple mixing in a mixer or a kneader of calcium carbide with an appropriate binder already makes it possible to increase the number of coarse particles and to decrease the number of fine particles. However, in the best case, that of Example 5, the product obtained has only 44% of particles with a diameter greater than 200 ⁇ m.
  • FIG. 1 represents in another, more synthetic form, the particle sizes of the starting product and of the mixtures corresponding to Examples 2 to 5.
  • the ordinates the cumulative percentages of the grains smaller than the dimensions plotted on the abscissa.
  • a mixture of calcium carbide and coal having the particle size indicated in Example 2 was added in a mixer, supplemented with 5% stearic acid.
  • the temperature in the mixer was adjusted to approximately 100 ° C. in order to maintain the liquid stearic acid.
  • a product consisting of carbide coated with stearin was obtained having a particle size intermediate between that of the products of Examples 3 and 5. After cooling, this product was introduced into the feed hopper of a pelletizer whose pressure was set at 7 bars.
  • the product was formed into small cylinders 10 mm in diameter and 6 mm in height having an approximate weight of 1 g. These pellets were then shredded in a gentle manner in a hammer mill. Grains were obtained, all less than 6 mm, of which approximately 64% were between 0.3 and 6 mm. The grains ⁇ 0.3 mm were recycled in the mixer.
  • a mixture of calcium carbide having the particle size indicated in example 2 was added in a mixer, supplemented with 10% stearic acid. The temperature in the mixer was maintained at approximately 100 ° C. so that the stearic acid remained liquid. .
  • a product consisting of carbide coated with stearin having a particle size similar to that of the products of Example 5 was obtained. At a temperature of between 80 ° C. and 100 ° C. (since cooling is not necessary in this case ), the product was introduced into the feed hopper of a roller press. The interval between the rollers varied in different tests from 0.5 to 5 mm. The final product was thus obtained in the form of small plates of a few cm side and from 0.5 to 5 mm thick.
  • a mixture of calcium carbide having a particle size between 0 and 12 mm was added in a kneader supplemented with 5% stearic acid.
  • the temperature in the mixer was kept at room temperature.
  • the mixture obtained was introduced into the feed hopper of a ball press, a press the cylinders of which bear alveoli in the form of balls.
  • the press behaves like a grinder in which the carbide grains are reduced.
  • the ground grains are, in the vicinity of the plane containing the axes of the cylinders, agglomerated using the binder in the form of balls. These balls were then shredded in a gentle manner in a hammer mill. Grain was obtained of which about 60% was between 0.3 and 10 mm.
  • the grain ⁇ 0.3 mm was recycled in the mixer while the grain> 10 mm was recycled in the hammer mill.
  • the use of the desulfurizer based on agglomerated calcium carbide according to the invention has a desulfurization efficiency almost equivalent to that of a quantity of carbide in grains of 0.3 to 4 mm more than five times greater.

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Claims (28)

  1. Erzeugnis zur Entschwefelung der Roheisenschmelze, das aus Calciumcarbid, gegebenenfalls einem oder mehreren aus der Gruppe stammenden Produkten, die aus Kalk, Calciumcarbonat, Diamidkalk, Magnesiumoxid, Aluminiumoxid, Gasruß, Aluminium, Magnesium und Calcium besteht, in einem Gewichtsanteil von höchstens gleich dem Gewichtsanteil an Calciumcarbid, und einem Bindemittel besteht, wobei dieses Erzeugnis in Form eines mit Hilfe des Bindemittels umhüllten oder agglomerierten Pulvers vorliegt, welches Bindemittel entweder ein organisches Produkt mit einem scharfen Schmelzpunkt im Bereich von 70 bis 100 °C oder ein Furfurylharz mit einer Polymerisationstemperatur im Bereich von 40 bis 70 °C ist.
  2. Erzeugnis zur Entschwefelung des Roheisens nach Anspruch 1, dadurch gekennzeichnet, daß es aus Körnern aus Calciumcarbid besteht, die mit einer ersten Schicht aus bei Raumtemperatur festem Bindemittel und gegebenenfalls einer zweiten äußeren, mehr oder weniger kontinuierlichen Schicht aus feineren Körnern aus Calciumcarbid umhüllt sind, die selbst umhüllt sind.
  3. Erzeugnis zur Entschwefelung des Roheisens nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Carbidpulver feinstzerkleinertes Pulver mit einem Durchmesser der Körner im Bereich von einigen µm bis 250 µm ist.
  4. Erzeugnis zur Entschwefelung des Roheisens nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Bindemittel ein Pech ist.
  5. Erzeugnis zur Entschwefelung des Roheisens nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Bindemittel Stearinsäure ist.
  6. Erzeugnis zur Entschwefelung des Roheisens nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Bindemittel ein gesättigter Glycerinfettsäureester ist.
  7. Erzeugnis zur Entschwefelung der Roheisen nach Anspruch 6, dadurch gekennzeichnet, daß die chemische Reinheit des gesättigten Fettsäureesters mindestens 90 % beträgt.
  8. Erzeugnis zur Entschwefelung der Roheisen nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, daß der gesättigte Fettsäureester hydriertes Rizinusöl auf der Basis von Glycerintrihydroxystearat ist.
  9. Erzeugnis zur Entschwefelung der Roheisen nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Menge des Bindemittels im Bereich von 0,2 bis 10 Gew.-% des Carbids liegt.
  10. Erzeugnis zur Entschwefelung der Roheisen nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß dem Pulver aus Calciumcarbid ein kohlenstoffhaltiges Produkt wie Kohle, Anthrazit, Petrolkoks in einem Anteil von 4 bis 10 Gew.-% des Carbids zugesetzt wird.
  11. Erzeugnis zur Entschwefelung der Roheisen nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Korngröße bei 85 % seiner Körner im Bereich von 25 bis 300 µm liegt.
  12. Erzeugnis zur Entschwefelung des Roheisens nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Körner einen Durchmesser im Bereich von 0,3 bis 10 mm aufweisen.
  13. Erzeugnis zur Entschwefelung der Roheisen nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die agglomerierten Körner aus Calciumcarbid mit etwa 1 % Gasruß vermischt sind.
  14. Verfahren zur Herstellung eines in Form eines mit einem Bindemittel umhüllten oder agglomerierten Pulvers vorliegenden Erzeugnisses, zur Entschwefelung der Roheisen, das Calciumcarbid und gegebenenfalls einen oder mehrere Zusätze, die aus der Gruppe stammen, die aus Kalk, Calciumcarbonat, Diamidkalk, Magnesiumoxid, Aluminiumoxid, Gasruß, Aluminium, Magnesium und Calcium besteht, in einem Gesamtgewichtsanteil von höchstens dem des Calciumcarbids enthält, bei welchem Verfahren ein homogenes Gemisch aus Calciumcarbidpulver, den gegebenenfalls vorhandenen Zusatzstoffen und einem Bindemittel hergestellt wird, das entweder aus einem organischen Produkt mit einer scharfen Schmelztemperatur im Bereich von 70 bis 100 °C oder einem Furfurylharz mit einer Polymerisationstemperatur im Bereich von 40 bis 70 °C besteht.
  15. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach Anspruch 14, dadurch gekennzeichnet, daß feinstzerkleinertes Calciumcarbid mit einem Bindemittel aus einem organischen Produkt mit einer scharfen Schmelztemperatur im Bereich von 70 bis 100 °C bei einer Temperatur vermischt wird, die über der Schmelztemperatur des Bindemittels liegt.
  16. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach Anspruch 15, dadurch gekennzeichnet, daß das Mischen des Calciumcarbids mit dem Bindemittel in der Mühle der Carbidzerkleinerung durchgeführt wird, an deren Eingang das Bindemittel zugesetzt wird.
  17. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 16, dadurch gekennzeichnet, daß der Anteil des mit dem Carbid vermischten Bindemittels im Bereich von 0,2 bis 10 Gew.-% des Carbids liegt.
  18. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 15 bis 17, dadurch gekennzeichnet, daß dem Gemisch aus Calciumcarbid-Bindemittel ein kohlenstoffhaltiges Produkt im Anteil von 4 bis 10 Gew.-% des Carbids entweder in der Mühle oder am Ausgang der Mühle zugesetzt wird.
  19. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 15 bis 18, in dem das verwendete Bindemittel ein organisches Bindemittel mit einem scharfen Schmelzpunkt im Bereich von 70 bis 100 °C ist und die Gemischbildung bei einer Temperatur durchgeführt wird, die höher als dieser Schmelzpunkt ist, dadurch gekennzeichnet, daß das erhaltene homogene Gemisch anschließend entweder mit einer Vorrichtung ohne Druck vom Typ Granuliertrommel, Granulierteller oder Granulierkegel oder auch mit Druck vom Typ Pelletierpresse, Walzenpresse, Tablettierpresse oder Extruder agglomeriert und geformt wird.
  20. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach Anspruch 16, in dem das verwendete Bindemittel ein Furfurylharz ist und die Gemischbildung bei Raumtemperatur durchgeführt wird, dadurch gekennzeichnet, daß das erhaltene homogene Gemisch anschließend entweder mit einer Vorrichtung ohne Druck vom Typ Granuliertrommel, Granulierteller oder Granulierkegel oder auch mit Druck vom Typ Pelletierpresse, Walzenpresse, Tablettierpresse oder Extruder agglomeriert und geformt wird, und dadurch, daß das Harz polymerisiert wird.
  21. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 19 oder 20, dadurch gekennzeichnet, daß das agglomerierte und geformte homogene Gemisch anschließend zerkleinert und gesiebt wird, um die gewünschte Korngröße zu erhalten.
  22. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 19, 21, dadurch gekennzeichnet, daß das Bindemittel ein Pech ist.
  23. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 19, 21, dadurch gekennzeichnet, daß das Bindemittel Stearinsäure ist.
  24. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 19, 21, dadurch gekennzeichnet, daß das Bindemittel ein Glycerinfettsäureester ist.
  25. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach Anspruch 24, dadurch gekennzeichnet, daß das Bindemittel hydriertes Rizinusöl auf der Basis von Glycerintrihydroxystearat ist.
  26. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 19, 21, 22, 23, 24, 25, dadurch gekennzeichnet, daß das Gemisch aus Calciumcarbid, gegebenenfalls kohlenstoffhaltigem Produkt und Bindemittel in einer Agglomerierungsvorrichtung gebildet wird: Granuliertrommel, Granulierteller oder Granulierkegel.
  27. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 25, dadurch gekennzeichnet, daß das Zerkleinern von Calciumcarbid mit einer Korngröße im Bereich von 0 bis 12 mm und sein Mischen mit dem festen Bindemittel in einer Zylinderpresse bei Raumtemperatur durchgeführt werden.
  28. Verfahren zur Herstellung eines Erzeugnisses zur Entschwefelung der Roheisen nach einem der Ansprüche 14 bis 27, dadurch gekennzeichnet, daß das agglomerierte, nochmals zerkleinerte, gesiebte Produkt mit etwa 1 % Gasruß, bezogen auf sein Gewicht, vermischt wird.
EP92420097A 1991-04-02 1992-03-31 Entschwefelungsmittel für Roheisen, aus Calciumkarbid und organisches Bindemittel Expired - Lifetime EP0511121B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9104452 1991-04-02
FR9104452A FR2674867B1 (fr) 1991-04-02 1991-04-02 Desulfurant pour fonte constitue de carbure de calcium enrobe.
FR9109557 1991-07-18
FR9109557A FR2679256B1 (fr) 1991-07-18 1991-07-18 Desulfurant pour fonte liquide a base de carbure de calcium agglomere.
NL9201746A NL9201746A (nl) 1991-04-02 1992-10-08 Ontzwavelingsmiddel voor een metaalsmelt, bestaande uit calciumcarbide en een organisch bindmiddel.

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EP0511121A1 EP0511121A1 (de) 1992-10-28
EP0511121B1 true EP0511121B1 (de) 1996-09-11

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EP (1) EP0511121B1 (de)
AT (1) ATE142705T1 (de)
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AUPN015994A0 (en) * 1994-12-20 1995-01-19 Commonwealth Scientific And Industrial Research Organisation Nitrification inhibitor
DE19724913A1 (de) * 1997-06-12 1998-12-17 Almamet Gmbh Mittel zur fluorfreien Behandlung von Stahlschmelzen in der Gießpfanne, Verfahren zu seiner Herstellung und seine Verwendung
US6989040B2 (en) * 2002-10-30 2006-01-24 Gerald Zebrowski Reclaimed magnesium desulfurization agent
HU225376B1 (en) * 2002-11-04 2006-10-28 Janos Kasuba Method for producing corrosion resistant steel and cast-iron by new iron-carbon alloy
CA2640471A1 (en) * 2006-02-09 2007-08-16 Carmeuse North America Services, Inc. Conditioned quicklime for injection to a molten bath of a steel-making vessel
DE102012013662A1 (de) * 2012-07-10 2014-01-16 Mechthilde Döring-Freißmuth Füllldraht und Verfahren zur Behandlung von Eisenschmelzen
US9481917B2 (en) * 2012-12-20 2016-11-01 United Technologies Corporation Gaseous based desulfurization of alloys
CA2849130A1 (en) 2013-04-19 2014-10-19 Dean Mccann Synthetic slag briquettes for use in steelmaking

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DE69213541D1 (de) 1996-10-17
US5242480A (en) 1993-09-07
EP0511121A1 (de) 1992-10-28
ATE142705T1 (de) 1996-09-15
ES2091429T3 (es) 1996-11-01

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