US3598573A - Desulfurization agent and process - Google Patents

Desulfurization agent and process Download PDF

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Publication number
US3598573A
US3598573A US819997A US3598573DA US3598573A US 3598573 A US3598573 A US 3598573A US 819997 A US819997 A US 819997A US 3598573D A US3598573D A US 3598573DA US 3598573 A US3598573 A US 3598573A
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United States
Prior art keywords
desulfurization
precipitated
weight
calcium
calcium carbonate
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US819997A
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Alfred Freissmuth
Walter Heinl
Herbert Knahl
Erich Pfluger
Jan Schokkenbroek
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Evonik Operations GmbH
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SKW Trostberg AG
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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

Definitions

  • This invention relates to an improvement in desulfurization agent for ferrous melts, e.g., pig iron, cast iron and steel melts, and to an improved desulfurization process.
  • ferrous melts e.g., pig iron, cast iron and steel melts
  • precipitated, carbon-containing calcium carbonate refers to a mixture consisting essentially of finely divided calcium carbonate and carbon such as that obtained in the preparation of a dicyandiamide product, in the course of which an aqueous calcium cyanamide' suspension is treated with carbon dioxide to precipitate the calcium carbonate in a very finely divided state intimately admixed with finely divided and co-precipitated carbon.
  • This precipitate contains about 70 to 85% by weight calcium carbonate and about 8 to 12% carbon in addition to minor proportions of impurities, especially ferric oxide, aluminum oxide and silicon dioxide.
  • the desulfurizing agent of the invention is added to a ferrous melt in an amount that depends upon the initial and desired final sulfur contents of the melt.
  • ordinary initial sulfur contents of the order of about 0.04 to 0.06% by weight
  • 1.3 kg. desulfurizing agent per ton of melt suffices to reduce the sulfur content by about 0.010%
  • approximately 1.7 kg. per ton is required to obtain the same effect of reducing the sulfur content by about 0.01% at melt temperatures of the order of 1200 to 1400 C.
  • the desulfurizing agent of the invention is that it is available in very finely divided form. It is, therefore, entirely practical to add it to the melt by blowing or by stirring it in, the latter being accomplished with a shaking pan or a mechanical stirring device. Basically, however, introduction of the desulfurizing agent may take place in a manner suitable to any other pulverulent material and can also take place in the furnace.
  • the precipitated calcium carbonate has a structure which is particularly favorable for desulfurization due, perhaps, to increased intimate mixing and contact between the iron in the melt and the calcium carbide promoted by generation of carbon dioxide.
  • the finely divided carbon contained in the precipitated carbonate compensates for the slight decarbonization that takes place with desulfurization and, at the same time, provides the reducing conditions required for desulfurization.
  • the desulfurizing agent of the invention is positive in its desulfurizing function and is also more economical to use because the losses of iron into the slag are thereby reduced.
  • the efficiency with which the calcium carbide component of the combination is consumed, as compared with the consumption of calcium carbide when used alone, is significantly greater.
  • EXAMPLE 1 (Prior art) Charges of approximately 35 metric tons pig iron each were desulfurized at between 1260 and 1380 C. with a commercial grade of calcium carbide having a CaC content of approximately by weight introduced into the melt with predried air at 5 atmospheres pressure as carrier gas.
  • the carbide had granule sizes of 0.3 to 0.7 mm. in Charges Nos. 1 to 9 and 0.06 to 0.08 mm. in Charges Nos. 10 to 15.
  • the amounts of carbide charged, the sulfur contents of the melt before and after desulfurization, and the efliciency were:
  • Example 2 The procedure in Example 1 was repeated, all conditions remaining the same except that the desulfurization agent used was a mixture of (A) 80% by weight of the same commercial grade calcium carbide having a CaC content of approximately 80%, and (B) 20% by weight precipitated calcium carbonate containing approximately 75% by weight CaCO 12% by weight carbon and the remainder Fe O A1 0 and SiO impurities.
  • the carbide had granule sizes of 0.06 to 0.08 mm. and the precipitated carbonate had granule sizes of less than 0.06 mm.
  • the desulfurization agent used was a mixture of (A) 80% by weight of the same commercial grade calcium carbide having a CaC content of approximately 80%, and (B) 20% by weight precipitated calcium carbonate containing approximately 75% by weight CaCO 12% by weight carbon and the remainder Fe O A1 0 and SiO impurities.
  • the carbide had granule sizes of 0.06 to 0.08 mm. and the precipitated carbonate had granule sizes of less than
  • a desulfurization agent for ferrous melts essentially consisting of from about to about 98% by weight calcium carbide and from about 2 to 40% by weight precipitated, carbon-containing calcium carbonate.
  • a process for desulfurizing a sulfur-containing ferrous melt which comprises treating said melt with between about 1.3 and 1.7 kg. of a desulfurization agent per ton of iron melt per 0.01% desired reduction in sulfur content, said desulfurization agent consisting essentially of from about 60 to about 98% by weight calcium carbide and from about 2 to about 40% by weight precipitated, carbon-containing calcium carbonate.

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  • 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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

A MIXTURE OF CALCIUM CARBIDE AND PRECIPITATED, CARBONCONTAINING CALCIUM CARBONATE IS MOST EFFECTIVE IN DESULFURIZING FERROUS MELTS.

Description

United States Patent Oiice 3,598,573 DESULFURIZATION AGENT AND PROCESS Alfred Freissmuth, Trostberg, Walter Heinl, Garching,
and Herbert Knahl and Erich Pfluger, Trostherg, Germany, and Jan Schokkenbroek, Alkmaar, Netherlands,
assignors to Suddeutsche Kalkstickstotf-Werke Aktiengesellschaft, Trostberg, Germany No Drawing. Filed Apr. 28, 1969, Ser. No. 819,997
Claims priority, application Germany, Apr. 29, 1968,
P 17 58 250.2 Int. Cl. C21e 1/02 U.S. Cl. 75--55 4 Claims ABSTRACT OF THE DISCLOSURE A mixture of calcium carbide and precipitated, carboncontaining calcium carbonate is most effective in desulfurizing ferrous melts.
This invention relates to an improvement in desulfurization agent for ferrous melts, e.g., pig iron, cast iron and steel melts, and to an improved desulfurization process.
It is acknowledged to be old to desulfurize ferrous melts by treatment with calcium carbide alone or in admixture with other inorganic compounds such as quicklime, sodium fluoride, calcium-silicide, lithium compounds, sodium chloride, as well as with sodium carbonate. In practice, light, solid desulfurizing agents are introduced into the melts, which are of higher specific weight, by use of carrier gases such as compressed air, nitrogen, argon, carbon dioxide or mixtures thereof. The demands of industry for lower and lower sulfur content in iron and steel keep increasing. Since low sulfur contents in the furnace can often not be achieved economically or with certainty, it has become increasingly important to provide for desulfurization outside the furnace.
Desulfurization with calcium carbide alone or in combination with the afore-mentioned compounds, as well as with sodium carbonate, leaves much to be desired from the standpoints of achieving the desired low sulfur content or economical operation, or both. In comparison with the other desulfurization agents mentioned, limestone is largely impractical.
There is, consequently, a demand for an improved agent for desulfurizing ferrous melts that does not have the aforesaid disadvantages. This demand is satisfied, in accordance with the invention, with a desulfurizing agent containing, in addition to calcium carbide, 2 to 40%, preferably to 20% by Weight of precipitated, carboncontaining calcium carbonate.
The term precipitated, carbon-containing calcium carbonate refers to a mixture consisting essentially of finely divided calcium carbonate and carbon such as that obtained in the preparation of a dicyandiamide product, in the course of which an aqueous calcium cyanamide' suspension is treated with carbon dioxide to precipitate the calcium carbonate in a very finely divided state intimately admixed with finely divided and co-precipitated carbon. This precipitate contains about 70 to 85% by weight calcium carbonate and about 8 to 12% carbon in addition to minor proportions of impurities, especially ferric oxide, aluminum oxide and silicon dioxide.
3,598,573 Patented Aug. 10, 1971 While a desulfurizing agent containing in excess of 40% precipitated carbon-containing calcium-carbonate is operable, it is to be avoided because of difficulties caused by increasing generation of gas.
In use, the desulfurizing agent of the invention is added to a ferrous melt in an amount that depends upon the initial and desired final sulfur contents of the melt. With ordinary initial sulfur contents of the order of about 0.04 to 0.06% by weight, 1.3 kg. desulfurizing agent per ton of melt suffices to reduce the sulfur content by about 0.010% If the initial sulfur content is lower, i.e., of the order of 0.02. to 0.03%, approximately 1.7 kg. per ton is required to obtain the same effect of reducing the sulfur content by about 0.01% at melt temperatures of the order of 1200 to 1400 C.
One advantage of the desulfurizing agent of the invention is that it is available in very finely divided form. It is, therefore, entirely practical to add it to the melt by blowing or by stirring it in, the latter being accomplished with a shaking pan or a mechanical stirring device. Basically, however, introduction of the desulfurizing agent may take place in a manner suitable to any other pulverulent material and can also take place in the furnace.
While the reason for the synergistic effect of precipitated calcium carbonate and calcium carbide is not fully understood, it is assumed that the precipitated calcium carbonate has a structure which is particularly favorable for desulfurization due, perhaps, to increased intimate mixing and contact between the iron in the melt and the calcium carbide promoted by generation of carbon dioxide. In addition, the finely divided carbon contained in the precipitated carbonate compensates for the slight decarbonization that takes place with desulfurization and, at the same time, provides the reducing conditions required for desulfurization.
The desulfurizing agent of the invention is positive in its desulfurizing function and is also more economical to use because the losses of iron into the slag are thereby reduced. In addition, the efficiency with which the calcium carbide component of the combination is consumed, as compared with the consumption of calcium carbide when used alone, is significantly greater.
The advantages of the desulfurizing agent of the invention are surprising because calcium carbonate alone is ineffective whereas the combination of the invention has appreciably greater desulfurizing activity than is obtainable by a like amount of calcium carbide, thus making it possible to attain preselected and desired desulfurization effects. The progress in the art achieved by the desulfurizing agent and the method of the present invention will become further apparent from the following examples:
EXAMPLE 1 (Prior art) Charges of approximately 35 metric tons pig iron each were desulfurized at between 1260 and 1380 C. with a commercial grade of calcium carbide having a CaC content of approximately by weight introduced into the melt with predried air at 5 atmospheres pressure as carrier gas. The carbide had granule sizes of 0.3 to 0.7 mm. in Charges Nos. 1 to 9 and 0.06 to 0.08 mm. in Charges Nos. 10 to 15. The amounts of carbide charged, the sulfur contents of the melt before and after desulfurization, and the efliciency (based on a theoretical capacity of 800 g. CaC to remove 400 g. sulfur) were:
Desuliurization Carbide sulfur content, charge, kg. percent Pig iron charge per ton of Efficiency, N o. pig iron Before After percent 3. 98 0. 025 0. 011 8. 7 3. O4 0. 020 0. 011 7. 5 3. 1O 0. 02a 0. 011 10. 5 6. 03 0. 032 0. 014 7. 5 5. 95 0. 020 0. 013 6. 8 2. 8e 0. 028 0. 018 8. 8 5. l8 0. 053 0. 027 12. 7. 70 0. 047 0. 025 7. 2 ti. 0 0. 018 0.007 4. 6
Average 8. 2
Average 10. 9
EXAMPLE 2 The procedure in Example 1 was repeated, all conditions remaining the same except that the desulfurization agent used was a mixture of (A) 80% by weight of the same commercial grade calcium carbide having a CaC content of approximately 80%, and (B) 20% by weight precipitated calcium carbonate containing approximately 75% by weight CaCO 12% by weight carbon and the remainder Fe O A1 0 and SiO impurities. The carbide had granule sizes of 0.06 to 0.08 mm. and the precipitated carbonate had granule sizes of less than 0.06 mm. The
results were:
Charge of desulfurization Sulfur content percent Ethmixture kg./- eiency, Pig iron charge No. ton Before After percent 5. 40 0. 050 0. 010 22. 8 5. 07 O. 037 0. 008 17. 6 4. 23 0. 042 0. 014 20. 2 4. 36 0. 028 0. 007 14. 8 5. 06 0. 058 0. 014 26. 7 2. 13 0. 034. 0. 016 26. 8 3. 07 0. 040 0. 014 26. 0 2. 94 0. 056 0. 027 30.0 23. 1
It is apparent, from a comparison of the data in the tables of Examples 1 and 2, that the method of the invention provides an average increase in efiiciency of calcium carbide utilization of over 100%.
What is claimed is:
1. A desulfurization agent for ferrous melts essentially consisting of from about to about 98% by weight calcium carbide and from about 2 to 40% by weight precipitated, carbon-containing calcium carbonate.
2. A desulfurization agent as defined in claim 1 wherein the proportion of precipitated calcium carbonate is from about 10% to about 20% by weight.
3. A.desulfurization agent as defined in claim 1 wherein the precipitated calcium carbonate contains about to 85% by weight finely divided calcium carbonate initimately admixed with about 8 to 12% by weight coprecipitated carbon.
4. A process for desulfurizing a sulfur-containing ferrous melt which comprises treating said melt with between about 1.3 and 1.7 kg. of a desulfurization agent per ton of iron melt per 0.01% desired reduction in sulfur content, said desulfurization agent consisting essentially of from about 60 to about 98% by weight calcium carbide and from about 2 to about 40% by weight precipitated, carbon-containing calcium carbonate.
References Cited UNITED STATES PATENTS 2,755,180 7/1956 De Laval -58X 3,051,564 8/1962 Drenning 75-58X FOREIGN PATENTS 812,410 4/1959 Great Britain 75-53 L. DEWAYNE RUTLEDGE, Primary Examiner I. E. LEGRU, Assistant Examiner US. Cl. X.R. 7545, 53
US819997A 1968-04-29 1969-04-28 Desulfurization agent and process Expired - Lifetime US3598573A (en)

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DE19681758250 DE1758250B1 (en) 1968-04-29 1968-04-29 Agent for the desulphurisation of iron melts

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DE (1) DE1758250B1 (en)
FR (1) FR2007154A1 (en)
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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716352A (en) * 1969-10-24 1973-02-13 Kawasaki Steel Co Sintered desulfurizer for off-furnace use
US3884679A (en) * 1973-05-24 1975-05-20 Sueddeutsche Kalkstickstoff Method of preparing a stable mixture of calcium with a compound yielding water at elevated temperature
US3885957A (en) * 1972-03-01 1975-05-27 Thyssen Niederrhein Ag Method for the desulfurization of a steel melt
US3954446A (en) * 1974-02-23 1976-05-04 Kubota Ltd. Method of producing high duty cast iron
US3955966A (en) * 1974-03-06 1976-05-11 August Thyssen-Hutte Ag Method for dispensing a fluidizable solid from a pressure vessel
US3992196A (en) * 1971-06-25 1976-11-16 Nippon Kokan Kabushiki Kaisha Method and apparatus for the continuous refining of iron and alloys
US3992195A (en) * 1974-04-20 1976-11-16 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for the production of steel with increased ductility
US4067730A (en) * 1974-04-20 1978-01-10 Thyssen Niederrhein Ag Hutten-Und Walzwerke Process for the production of steel with increased ductility
US4194902A (en) * 1977-09-15 1980-03-25 Skw Trostberg Aktiengesellschaft Desulfurization agent for ferrous melts and method of using the same
US4321088A (en) * 1978-05-11 1982-03-23 Basf Aktiengesellschaft Process for treating pig iron melts and steel melts or alloys
US4323392A (en) * 1979-05-14 1982-04-06 Albert Braun Agent for desulfurizing crude iron and steel melts, and process for making it
US4358312A (en) * 1979-12-29 1982-11-09 Hoechst Aktiengesellschaft Desulfurizing agent and process for its manufacture
US4368071A (en) * 1979-12-29 1983-01-11 Hoechst Aktiengesellschaft Process for the manufacture of desulfurizing agents for crude iron or steel melts
US4395282A (en) * 1981-03-24 1983-07-26 Hoechst Aktiengesellschaft Desulfurization mixture and process for making it
US4409028A (en) * 1979-10-24 1983-10-11 Moore William H Process for producing cast iron
US4420333A (en) * 1980-05-10 1983-12-13 Nippon Carbide Kogyo Kabushiki Kaisha Powdery desulfurizer composition
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US4490172A (en) * 1979-06-29 1984-12-25 Moore William H Method of melting and refining steel and other ferrous alloys
US4764211A (en) * 1985-12-17 1988-08-16 Thyssen Stahl Ag Fine-grained agent for desulfurizing molten iron
AU586116B2 (en) * 1987-02-13 1989-06-29 Cyanamid Canada Inc. Method of desulfurizing iron
US5279639A (en) * 1990-04-06 1994-01-18 Tam Ceramics, Inc. Compositions for synthesizing ladle slags
US5343491A (en) * 1991-11-28 1994-08-30 Carbagas And Von Roll Ag Method of suppressing dust and fumes during electric steel production
US5358550A (en) * 1992-10-26 1994-10-25 Rossborough Manufacturing Company Desulfurization agent
EP1146130A2 (en) * 2000-04-10 2001-10-17 Rossbourugh Manufacturing Co., L.P. Magnesium injection agent and process for ferrous metal treatment
US6352570B1 (en) 2000-04-10 2002-03-05 Rossborough Manufacturing Co., Lp Magnesium desulfurization agent
US20040074339A1 (en) * 2002-10-18 2004-04-22 Rossborough Manufacturing Company, A Delaware Corporation Process for magnesium granules
US20040083851A1 (en) * 2002-10-30 2004-05-06 Rossborough Manufacturing Company, A Delaware Corporation Reclaimed magnesium desulfurization agent
US20080196548A1 (en) * 2007-02-16 2008-08-21 Magnesium Technologies Corporation Desulfurization puck
US7731778B2 (en) 2006-03-27 2010-06-08 Magnesium Technologies Corporation Scrap bale for steel making process
US9187792B2 (en) 2011-01-15 2015-11-17 Alamamet GmbH Agent for treating molten metals, method for the production and use thereof

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2252796C3 (en) * 1972-10-27 1982-08-12 Skw Trostberg Ag, 8223 Trostberg Desulphurizing agent for pig iron and ferro-alloy melts
DE2252795C3 (en) * 1972-10-27 1982-09-09 Skw Trostberg Ag, 8223 Trostberg Desulphurizing agent for pig iron and ferro-alloy melts
FR2432550A1 (en) * 1978-08-04 1980-02-29 Sueddeutsche Kalkstickstoff PROCESS FOR THE MANUFACTURE OF AN EASILY FLOWABLE PULVERULATED DESULFURIZATION MIXTURE
JPS55110712A (en) * 1979-02-15 1980-08-26 Kawasaki Steel Corp Desulfurizing agent for blowing-in
DE3022752A1 (en) * 1980-06-18 1982-01-14 Skw Trostberg Ag, 8223 Trostberg DESULFURING AGENT
DE4242328C2 (en) * 1992-12-15 1995-06-08 Alfred Dipl Ing Dr Freissmuth Means for desulfurization, dephosphorization, desiliconization and denitrification of pig iron and cast iron melts
DE102011008691A1 (en) 2011-01-15 2012-07-19 Mechthilde Döring-Freißmuth Agent, useful e.g. to treat metal melts, preferably for desulfurization of pig iron melts, comprises an element, in elemental and/or bonded state, comprising alkali metal, alkaline earth metal or earth metal (first Component) and bitumens
DE102011008690A1 (en) 2011-01-15 2012-07-19 Mechthilde Döring-Freißmuth Agent, useful for desulfurizing and/or dephosphorizing crude iron melt, comprises calcium oxide, optionally additional calcium-, magnesium-, or alkali-containing component and mineral and/or paraffinic oil

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716352A (en) * 1969-10-24 1973-02-13 Kawasaki Steel Co Sintered desulfurizer for off-furnace use
US3992196A (en) * 1971-06-25 1976-11-16 Nippon Kokan Kabushiki Kaisha Method and apparatus for the continuous refining of iron and alloys
US3885957A (en) * 1972-03-01 1975-05-27 Thyssen Niederrhein Ag Method for the desulfurization of a steel melt
US3884679A (en) * 1973-05-24 1975-05-20 Sueddeutsche Kalkstickstoff Method of preparing a stable mixture of calcium with a compound yielding water at elevated temperature
US3954446A (en) * 1974-02-23 1976-05-04 Kubota Ltd. Method of producing high duty cast iron
US3955966A (en) * 1974-03-06 1976-05-11 August Thyssen-Hutte Ag Method for dispensing a fluidizable solid from a pressure vessel
US3992195A (en) * 1974-04-20 1976-11-16 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for the production of steel with increased ductility
US4067730A (en) * 1974-04-20 1978-01-10 Thyssen Niederrhein Ag Hutten-Und Walzwerke Process for the production of steel with increased ductility
US4194902A (en) * 1977-09-15 1980-03-25 Skw Trostberg Aktiengesellschaft Desulfurization agent for ferrous melts and method of using the same
US4321088A (en) * 1978-05-11 1982-03-23 Basf Aktiengesellschaft Process for treating pig iron melts and steel melts or alloys
US4323392A (en) * 1979-05-14 1982-04-06 Albert Braun Agent for desulfurizing crude iron and steel melts, and process for making it
US4490172A (en) * 1979-06-29 1984-12-25 Moore William H Method of melting and refining steel and other ferrous alloys
US4409028A (en) * 1979-10-24 1983-10-11 Moore William H Process for producing cast iron
US4358312A (en) * 1979-12-29 1982-11-09 Hoechst Aktiengesellschaft Desulfurizing agent and process for its manufacture
US4368071A (en) * 1979-12-29 1983-01-11 Hoechst Aktiengesellschaft Process for the manufacture of desulfurizing agents for crude iron or steel melts
US4420333A (en) * 1980-05-10 1983-12-13 Nippon Carbide Kogyo Kabushiki Kaisha Powdery desulfurizer composition
US4395282A (en) * 1981-03-24 1983-07-26 Hoechst Aktiengesellschaft Desulfurization mixture and process for making it
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US4764211A (en) * 1985-12-17 1988-08-16 Thyssen Stahl Ag Fine-grained agent for desulfurizing molten iron
US4832739A (en) * 1985-12-17 1989-05-23 Thyssen Stahl Ag Process for desulfurizing molten iron
AU586116B2 (en) * 1987-02-13 1989-06-29 Cyanamid Canada Inc. Method of desulfurizing iron
US5279639A (en) * 1990-04-06 1994-01-18 Tam Ceramics, Inc. Compositions for synthesizing ladle slags
US5343491A (en) * 1991-11-28 1994-08-30 Carbagas And Von Roll Ag Method of suppressing dust and fumes during electric steel production
US5358550A (en) * 1992-10-26 1994-10-25 Rossborough Manufacturing Company Desulfurization agent
US6395058B2 (en) 2000-04-10 2002-05-28 Rossborough Manufacturing Co. L.P. Method of alloying ferrous material with magnesium injection agent
US6352570B1 (en) 2000-04-10 2002-03-05 Rossborough Manufacturing Co., Lp Magnesium desulfurization agent
US6383249B2 (en) 2000-04-10 2002-05-07 Rossborough Manufacturing Co. Lp Magnesium desulfurization agent
EP1146130A2 (en) * 2000-04-10 2001-10-17 Rossbourugh Manufacturing Co., L.P. Magnesium injection agent and process for ferrous metal treatment
EP1146130B1 (en) * 2000-04-10 2007-05-30 Magnesium Technologies Corporation Magnesium injection agent and process for ferrous metal treatment
US20040074339A1 (en) * 2002-10-18 2004-04-22 Rossborough Manufacturing Company, A Delaware Corporation Process for magnesium granules
US6770115B2 (en) 2002-10-18 2004-08-03 Remacor, Inc. Process for magnesium granules
US20040083851A1 (en) * 2002-10-30 2004-05-06 Rossborough Manufacturing Company, A Delaware Corporation Reclaimed magnesium desulfurization agent
US6989040B2 (en) 2002-10-30 2006-01-24 Gerald Zebrowski Reclaimed magnesium desulfurization agent
US20060021467A1 (en) * 2002-10-30 2006-02-02 Magnesium Technologies, Inc. Reclaimed magnesium desulfurization agent
US7731778B2 (en) 2006-03-27 2010-06-08 Magnesium Technologies Corporation Scrap bale for steel making process
US20080196548A1 (en) * 2007-02-16 2008-08-21 Magnesium Technologies Corporation Desulfurization puck
US9187792B2 (en) 2011-01-15 2015-11-17 Alamamet GmbH Agent for treating molten metals, method for the production and use thereof

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LU58448A1 (en) 1969-07-21
SE341196B (en) 1971-12-20
DE1758250B1 (en) 1971-10-28
GB1226088A (en) 1971-03-24
BE730577A (en) 1969-09-01
AT297768B (en) 1972-04-10
CH514677A (en) 1971-10-31
FR2007154A1 (en) 1970-01-02

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