US3681050A - Agent for desulfurizing molten pig iron - Google Patents

Agent for desulfurizing molten pig iron Download PDF

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Publication number
US3681050A
US3681050A US67356A US3681050DA US3681050A US 3681050 A US3681050 A US 3681050A US 67356 A US67356 A US 67356A US 3681050D A US3681050D A US 3681050DA US 3681050 A US3681050 A US 3681050A
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US
United States
Prior art keywords
molding
weight
molten iron
sodium hydroxide
desulfurizing agent
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Expired - Lifetime
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US67356A
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English (en)
Inventor
Kazufusa Ueki
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Aikoh Co Ltd
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Aikoh Co Ltd
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Publication date
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12222—Shaped configuration for melting [e.g., package, etc.]

Definitions

  • the present invention relates to a desulfurizing agent for molten iron.
  • a desulfurizing agent for molten iron such as, for example soda ash and the like. It is useful that a powdery, granular or lumpy desulfurizing agent is thrown into a ladle at the time of pouring a molten iron into it.
  • the difference of specific gravity between the desulfurizing agent and the molten iron is so large that as soon as the desulfurizing agent is added into the ladle, it floats up to the surface of the molten iron and becomes a slag, its contact reaction with the molten iron is conducted only on the boundary surface, and substantially all the desulfurizing agent is wasted without reacting.
  • the present invention is to improve all the above mentioned defects, to provide a molded desulfurizing agent consisting of a specific composition characterized by a desulfurizing agent of one body constituted integrally with single sodium hydroxide arranged in the lower part or the lower interior of the molding and contained in a container to be placed in a ladle of molten iron in advance.
  • the present invention is to provide a molding of a homogeneous composition containing sodium carbonate (soda ash), portland cement and sodium hydroxide and optionally water glass and a proper amount of water and having sodium hydroxide integrally arranged in the lower part or the lower interior of said molding so as to be contained in a container as a desulfurizing agent for molten iron.
  • the above mentioned molding is that of a homogeneous composition consisting of 53 to by weight of sodium carbonate, 5 to 18% by weight of portland cement, 3 to 10% by weight of sodium hydroxide, 0 to 4% by weight of water glass as the solid component and a proper amount of water.
  • one or more holes vertical to the bottom or recesses can be made.
  • single sodium hydroxide may be put into the lower part or the lower interior of the molding.
  • the amount of such sodium hydroxide to be used is 5 to 30% by weight of the molding.
  • the form of sodium hydroxide to be put into the lower part or the lower interior of the molding is powdery, granular, flaky, lumpy or solid after molding. Single sodium hydroxide is filled together with the molding directly or as contained in a bag in the above mentioned container.
  • the container containing a desulfurizing agent consisting of the above mentioned molding of homogeneous composition and single sodium hydroxide is made of formed steel, steel plate, hardboard, wooden plate, plastic and the like.
  • steel plate, damp-proof paper or the like may be placed between the above mentioned molding and single sodium hydroxide.
  • the upper part of the above mentioned steel container filled with desulfurizing agent is covered with steel or any other kind of plate.
  • the above mentioned desulfurizing agent is placed in the ladle for molten iron in advance and molten iron is poured onto the desulfurizing agent in the ladle and the desulfurization is conducted.
  • FIG. 1 is a plane view showing an embodiment of the desulfurizing agent according to the present invention
  • FIG. 2 is a vertically sectioned view of the same
  • FIG. 3 is a plane view showing another embodiment of the desulfurizing agent according to the present invention.
  • FIG. 4 is a vertically sectioned view in the position of B-B in FIG. 3,
  • FIG. 5 is a vertically sectioned view of the bottom part of the ladle for molten iron in which a desulfurizing agent according to the present invention is placed in advance,
  • FIG. 6 is a plane view showing another embodiment of a desulfurizing agent according to the present invention.
  • FIG. 7 is a vertically sectioned view in the position of CC in FIG. 6,
  • FIG. 8 is a plane view showing still another embodiment of a sulfurizing agent according to the present invention.
  • FIG. 9 is a vertically sectioned view in the position of D-D in FIG. 8,
  • FIG. 10 is a plane view showing still another embodiment of a sulfurizing agent according to the present invention.
  • FIG. 11 is a vertically sectioned view in the position of iE--E in FIG. 10,
  • FIG. 12 is a plane 'view showing another embodiment of a sulfurizing agent according to the present invention.
  • FIG. 13 is a vertically sectioned view in the position of FF in FIG. 12.
  • a molding 1 of one body consisting of sodium carbonate (soda ash), portland cement, sodium hydroxide, water glass and water is contained in steel container 3.
  • 1 is the same molding having a homogeneous composition in (FIGS. 1 and 2 and having a recess 5 in the center part.
  • the steel container 3 which is filled with the molding 1 of desulfurizing agent having a homogeneous composition according to the present invention is placed on the bottom of the ladle 8 for molten iron in advance.
  • sodium hydroxide 2 is placed on the bottom of a steel container 3 and the molding 1 of desulfurizing agent having homogeneous composition as mentioned above is charged on the sodium hydroxide 2 to unite therewith.
  • the hole 5 vertical to the bottom is made in the center part of the molding 1 ha ving a homogeneous composition as mentioned above and sodium hydroxide is placed under a steel plate or a dampproof plate 6 in the steel container 3 so as to make it one body, and if necessary the upper part of the molding is covered with a steel plate or the like 4.
  • FIGS. 12 and 13 plural number of recesses 5 are made in the same molding 1 of homogeneous composition as mentioned above and single sodium hydroxide 2 contained in polyethylene bag 7 is placed in the lower part of the molding 1.
  • soda ash used conventionally as a desulfurizing agent is powdery, it scatters at the time of addition, is high in the addition loss and floats to the surface of molten iron due to the light specific gravity. Accordingly, it desulfurizes only the surface of molten iron and nearly all of the amount of addition may be made a slag.
  • a molded soda ash made into lumps by pressing is used. However, as it is industrially impossible to make the bulk specific gravity of a molding to more than 2 only by a pressure molding of soda ash.
  • the desulfurizing agent according to the present invention has such specific composition and form as mentioned above and is therefore very suitable as a desulfurizing agent for molten iron. That is to say, the molding of desulfurizing agent which can give the fixed adding quantity by the use of one or two of the molding is placed in the ladle for molten iron in advance. Therefore, there is no complexity in the operation for continuously or discontinuously adding desulfurizing agent to the ladle as seen in the conventional method.
  • the desulfurizing agent according to the present invention can be molded to make it a fixed amount of addition by using less than several pieces, it does not float to the surface of molten iron, and improves the desulfurizing ratio. Nearly the same extent of desulfurization is obtained, even if the amount used decreases to /2 to /3 of soda ash. Therefore, as it is desirable on the economical standpoint and the desulfurizing efficiency is high. It is not necessary to add in excess and the erosion of the furnace wall isless than before, and thus the life of the furnace can be prolonged.
  • Portland cement produces stable CaS by the substituent reaction of CaO occupying the greater part of its composition with Na s produced by the above mentioned reaction Formula prevents the resulfurization, and at the same time acts as a binder and is thus an appropriate material for the present invention.
  • water glass may be used in a quantity of to 4% by weight of it as a solid component.
  • sodium carbonate (soda ash) and portland cement are used or when sodium hydroxide is in the form of powder, it is preferable to use 0 to 4% by weight of water glass as a solid component.
  • single sodium hydroxide to be placed as required together with the molding of the above mentioned composition range comes into contact with molten iron, violently reacts, gives a stirring motion to molten iron and has a desulfurizing effect. It is appropriate to use such single sodium hydroxide in a range of to 30% by weight based upon the weight of the above mentioned molding. In case of using it less than 5%, the above efiect is not obtained and it is not necessary to use sodium hydroxide in the molding more than 30% by weight. Further, it should avoid to use more than 30% by weight of sodium hydroxide because the reaction of it with molten iron becomes only violent.
  • the present invention is to use known sodium carbonate as a desulfurizing agent for molten iron.
  • this is a desulfurizingagent which is made to a molding having a specific composition by mixing other effective components to sodium carbonate and in which sodium hydroxide is placed and made into one body and which, can considerably increase the desulfurizing rate compared with the conventional desulfurizing agents as shown in the before-mentioned examples.
  • Desulfurizing agent for molten iron is a molding of a homogeneous composition containing sodium carbonate (soda ash), portland cement, sodium hydroxide, if necessary waterlglass and water and if any necessary sodium hydroxide being placed in the lower part or the lower interior of said molding so as to make it one body and the molding being placed in container.
  • composition of said molding is a homogeneous one containing 53 to 85% by weight of sodium carbonate, 5 to 18% by weight of portland cement, 3 to by weight of sodium hydroxide, 0 to 4% by weight of water glass as a solid component and a suitable quantity of water.
  • the shape of said molding is one which is if necessary provided with one or more of holes reaching the bottom or of recesses.
  • Single sodium hydroxide which is placed in the lower part or the lower interior of said molding may be if necessary used in a range of 5 to 30% by weight of said molding.
  • the shape of the single sodium hydroxide which is placed in the lower part or the lower interior of said molding is powdery, granular, flaky, lumpy or solid after melting and the single sodium hydroxide is directly placed into the before-mentioned container or is charged into polyethylene bag, resin-treated paper bag or other container and then is placed into the container.
  • a container which integrally contain the abovementioned molding having a homogeneous composition and if necessary single sodium hydroxide, a container made of a formed steel, steel plate, hardboard, wooden plate or plastics and the like.
  • the upper part of said container may be if necessary covered with a plate.
  • the present invention consists of a desulfurizing agent having said composition and form and consists of such desulfurizing method for molten iron as the desulfurizing agent contained in a container and is placed in the ladle for molten iron which is poured to the ladle from the top of said agent.
  • a desulfurizing agent for molten iron comprising a molding in a container, the molding consisting of a homogeneous composition comprising 53 to 58% by weight of sodium carbonate (soda ash), 5 to 18% by weight of portland cement, 3 to 10% by weight of sodium hydroxide and 0 to 4% by weight of water glass, and a proper quantity of water and united with 5 to 30% of sodium hydroxide based upon the weight of the molding at the lower interior of the molding and with the molding being providing with at least one recess.

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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)
  • Treatment Of Steel In Its Molten State (AREA)
US67356A 1970-03-27 1970-08-27 Agent for desulfurizing molten pig iron Expired - Lifetime US3681050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45025237A JPS5030571B1 (ja) 1970-03-27 1970-03-27

Publications (1)

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US (1) US3681050A (ja)
JP (1) JPS5030571B1 (ja)
DE (1) DE2042934C3 (ja)
SE (1) SE362265B (ja)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3847592A (en) * 1971-02-25 1974-11-12 Koninklijke Hoogovens En Staal Method for adding a granular or powdered reaction component to a molten metal, as well as an improved granular or powdered reaction component for carrying out a corrective reaction on a molten metal
US3865577A (en) * 1971-12-20 1975-02-11 Metallurg Forschungsanstalt Body for deoxidizing molten steel by submersion therein
US3871869A (en) * 1972-02-10 1975-03-18 Hoogovens Ijmuiden Bv Process for pressing briquettes from powdered substances more particularly from fine-grained fluorspar and briquettes thus obtained
US3877933A (en) * 1973-09-21 1975-04-15 Int Nickel Co Metallurgical addition product
US3885956A (en) * 1974-05-21 1975-05-27 Rheinische Kalksteinwerke Method and composition for the treatment of ferrous melts and process for making the treating composition
US3934862A (en) * 1973-04-12 1976-01-27 Labate Michael D Device for supplying a treating agent to molten metal in a ladle
US3955972A (en) * 1966-07-20 1976-05-11 Atlantic Richfield Company Method of producing sheets and article to practice such method
US4014684A (en) * 1973-11-27 1977-03-29 Foseco International Limited Manufacture of steel
US4014685A (en) * 1973-11-27 1977-03-29 Foseco International Limited Manufacture of steel
US4126446A (en) * 1972-03-06 1978-11-21 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Packages for the storage of air and moisture sensitive metallurgical additives and the use of such packages
US4127407A (en) * 1976-04-07 1978-11-28 Eitel Hans J Method of making a casting powder
US4199353A (en) * 1977-01-18 1980-04-22 Canron Inc. Molten metal treatment
US4233064A (en) * 1978-09-13 1980-11-11 Dunn Jr Edward J Method of scavenging steel
US4451293A (en) * 1979-05-31 1984-05-29 Quiqley Company, Inc. Slag-forming agent and process for producing the agent

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2252795C3 (de) * 1972-10-27 1982-09-09 Skw Trostberg Ag, 8223 Trostberg Entschwefelungsmittel für Roheisen- und Ferrolegierungsschmelzen
DE2252796C3 (de) * 1972-10-27 1982-08-12 Skw Trostberg Ag, 8223 Trostberg Entschwefelungsmittel für Roheisen und Ferrolegierungsschmelzen
GB1570454A (en) * 1976-07-15 1980-07-02 Yoshida Iron Works Co Ltd Method of and vessel for adding treatment agent to molten metal
DE102005061161A1 (de) * 2005-12-21 2007-06-28 Skw Stahl-Metallurgie Gmbh Verfahren zur Roheisenentschwefelung mit Hilfe von Calciumcarbid

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955972A (en) * 1966-07-20 1976-05-11 Atlantic Richfield Company Method of producing sheets and article to practice such method
US3847592A (en) * 1971-02-25 1974-11-12 Koninklijke Hoogovens En Staal Method for adding a granular or powdered reaction component to a molten metal, as well as an improved granular or powdered reaction component for carrying out a corrective reaction on a molten metal
US3865577A (en) * 1971-12-20 1975-02-11 Metallurg Forschungsanstalt Body for deoxidizing molten steel by submersion therein
US3871869A (en) * 1972-02-10 1975-03-18 Hoogovens Ijmuiden Bv Process for pressing briquettes from powdered substances more particularly from fine-grained fluorspar and briquettes thus obtained
US4126446A (en) * 1972-03-06 1978-11-21 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Packages for the storage of air and moisture sensitive metallurgical additives and the use of such packages
US3934862A (en) * 1973-04-12 1976-01-27 Labate Michael D Device for supplying a treating agent to molten metal in a ladle
US3877933A (en) * 1973-09-21 1975-04-15 Int Nickel Co Metallurgical addition product
US4014684A (en) * 1973-11-27 1977-03-29 Foseco International Limited Manufacture of steel
US4014685A (en) * 1973-11-27 1977-03-29 Foseco International Limited Manufacture of steel
US3885956A (en) * 1974-05-21 1975-05-27 Rheinische Kalksteinwerke Method and composition for the treatment of ferrous melts and process for making the treating composition
US4127407A (en) * 1976-04-07 1978-11-28 Eitel Hans J Method of making a casting powder
US4199353A (en) * 1977-01-18 1980-04-22 Canron Inc. Molten metal treatment
US4233064A (en) * 1978-09-13 1980-11-11 Dunn Jr Edward J Method of scavenging steel
US4451293A (en) * 1979-05-31 1984-05-29 Quiqley Company, Inc. Slag-forming agent and process for producing the agent

Also Published As

Publication number Publication date
SE362265B (ja) 1973-12-03
DE2042934A1 (de) 1971-10-07
JPS5030571B1 (ja) 1975-10-02
DE2042934B2 (de) 1978-08-17
DE2042934C3 (de) 1979-04-12

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