US3847592A - 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 - Google Patents

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 Download PDF

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Publication number
US3847592A
US3847592A US00226757A US22675772A US3847592A US 3847592 A US3847592 A US 3847592A US 00226757 A US00226757 A US 00226757A US 22675772 A US22675772 A US 22675772A US 3847592 A US3847592 A US 3847592A
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United States
Prior art keywords
reaction component
molten metal
reaction
mixture
accordance
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Expired - Lifetime
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US00226757A
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English (en)
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J Schokkenbroek
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Koninklijke Nl Hoogovens En Staalfab Nv nl
KONINKLIJKE HOOGOVENS EN STAAL
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KONINKLIJKE HOOGOVENS EN STAAL
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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
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition

Definitions

  • the present invention relates to a method for adding a granular or powdered reaction component to a molten metal, said reaction component remaining solid at the temperature of the molten metal.
  • the invention relates in addition to a granular or powdered reaction component of a kind which may be used for carrying out a corrective reaction on a molten metal.
  • FIGS. la, lb and 1c are graphs illustrating advantages of the invention based on test data hereinafter tabulated.
  • a granular or powdered reaction component is added to the bath of molten metal, said reaction component reacting mostly with the molten metal through the slag stage.
  • a few examples of such a process are the feeding of lime to pig iron in a steel furnace for refining pig iron into steel, and the feeding of a desulfurizing agent, such as calcium carbonate, calcium carbide etc. to molten pig iron, in order to withdraw dissolved sulfur from said pig iron.
  • a proper distribution between a reaction component and a metal bath may be achieved by chosing a reaction component which is also molten at the temperature of the molten metal and which will go into dissolution fast, as is the case when adding soda to a pig iron bath.
  • this method has disadvantages, such as in the case of soda in pig iron, when a slag is obtained which is particularly objectionable to the refractory lining of the receptacle for the molten metal.
  • soda gives off objectionable fumes and liberates a large amount of carbon dust from the reaction, as a consequence of which a nuisance for the environment is formed.
  • colloidal Si 0 powder are able to make substances such as lime and calcium carbide thin liquid" as it were. If such a mixture is poured out or is blown by a gaseous medium, it appears that the grains or the powder thereof hardly show a tendency to coagulate any longer.
  • the saving in lime in the steel refining process obtained according to the invention or the saving in desulfurizing agent in the desulfurizing process for pig iron may already be obtained by adding a minimum amount of the colloidal Si 0: powder. It has appeared that good results may be attained already with an addition of 0.1 percent of said powder to the additive or to the desulfurizing agent. The increase in cost price of the additive with addition or of the desulfurizing agent is neglectable with respect to the saving obtainable.
  • the invention not only relates to a method for adding a granular or powdered reaction component to a molten metal but also to said reaction component itself, whereby a solid, fine-powdered material is added to said reaction component in accordance with the invention, said solid material being suitable for reducing the cohesion of the grains of the reaction component. It has been noted before that in this connection good results are obtainable by adding colloidal Si 02 powder, pr eferably in a quantity of approximately 0.1 percent by weight. In this manner, an improvement of granular or powdered reaction components may be achieved, said components being used as additives during the refining of steel melt or having been chosen from the group of desulfurizing agents known as such for the desulfurization of pig iron.
  • a indicates the amount of kilograms of desulfurizing agent which is required for reducing the sulfur content in a ton of pig iron by 0.01 percent.
  • a desulfurizing agent which consists of a mixture of approximately 70 parts of technical lime nitrogen and 30 parts of a calcium carbonate contaminated with carbon in the form of so-called diamide lime.
  • Lime nitrogen contains approximately 60 percent of CaNCN, approximately 12 percent of carbon, CaO of 15 to percent, calcium carbonate of l to 6 percent and traces of other contaminations.
  • cyanamide is formed from the calcium cyanamide in a watery environment, when passing through CO2, in which the calcium hydroxide being formed reacts with the carbon dioxide to a fine-grained calcium carbonate, which will subsequently fiocculate.
  • diamide lime which, consequently, consists of very fine-grained calcium carbonate and which furthermore contains approximately 10 percent of carbon, derived from the lime nitrogen.
  • desulfurizing agent desulfurizing tests were made with pig iron species, the sulfur content of which is below 0.030 percent; between 0.050 and 0.069 percent and between 0.070 and 0.099 percent respectively.
  • Si 0 in itself is not a desulfurizing agent and that all substances of the general formula (CaO.nSi 0 have no desulfurizing effect either or a very bad one. Therefore, the improvement of the desulfurizing results should be sought in the better flowing properties of the mixture described.
  • a method for treating a molten metal with a reaction component which is solid at the temperature of the molten metal comprising mixing a dry granular reaction component prior to addition of same to the melt to be treated with a minor amount of a dry and finely powdered solid material capable of reducing the tendency of the reaction component granules to cohere with one another and to form a granular reaction component mixture in which said solid material is intimately dispersed throughout said reaction component insuring that said reaction component will be in a nonagglomerated state, said finely powdered solid material having substantially no effect on the termination of the reaction of said reaction component with the molten metal, and thereafter mixing said formed reaction component mixture with the molten metal to achieve a reaction between said reaction component and the molten metal.
  • the finely powdered solid material is SiO obtained by demetal comprising a major amount of a dry granular reaction component which is solid at the temperature of the molten metal and is capable of reacting with said molten metal to effect a processing thereof and a minor amount of a dry and finely powdered solid material capable of reducing the tendency of said reaction component granules to cohere with one another and forming a reaction component material mixture in which said solid material is intimately dispersed throughout said reaction component granules, insuring that said reaction component will be in a non-agglomerated state, said finely powdered solid material having no substantial effect on the reaction of the reaction component with the molten metal.
  • reaction mixture in accordance with claim 7, wherein the finely powdered solid material is SiO obtained by depositing Si0 in powder form from a colloidal solution of a silicon compound.
  • reaction mixture in accordance with claim 8 wherein said reaction component is a desulfurizing agent.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (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)
US00226757A 1971-02-25 1972-02-16 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 Expired - Lifetime US3847592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7102540A NL7102540A (de) 1971-02-25 1971-02-25

Publications (1)

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US3847592A true US3847592A (en) 1974-11-12

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US00226757A Expired - Lifetime US3847592A (en) 1971-02-25 1972-02-16 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

Country Status (11)

Country Link
US (1) US3847592A (de)
JP (1) JPS517443B1 (de)
AT (1) AT333811B (de)
BE (1) BE779766A (de)
DE (1) DE2207530C3 (de)
FR (1) FR2126367B1 (de)
GB (1) GB1352277A (de)
IT (1) IT949195B (de)
LU (1) LU64843A1 (de)
NL (1) NL7102540A (de)
SE (1) SE392915B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589915A (en) * 1984-02-28 1986-05-20 O.E.T. Metalconsult S.R.L. Additive for metallurgic liquids being effective to improve the characteristics of metal or metal alloy articles of manufacture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110712A (en) * 1979-02-15 1980-08-26 Kawasaki Steel Corp Desulfurizing agent for blowing-in

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790712A (en) * 1955-04-26 1957-04-30 Mannesmann Ag Process for refining iron
US3028232A (en) * 1953-05-06 1962-04-03 Voest Ag Process for blowing pig-iron
US3172758A (en) * 1965-03-09 Oxygen process for producing high
US3202504A (en) * 1961-08-07 1965-08-24 Heber J Hamlet Process for refining and improving the quality of steel and other ferrous metals
US3262772A (en) * 1962-07-06 1966-07-26 Gusstahlwerk Witten Ag Process for the production of alloy steels
US3536475A (en) * 1967-11-17 1970-10-27 Battelle Memorial Institute Method of making pellets from a finely divided solid material
US3585025A (en) * 1967-07-27 1971-06-15 Rheinische Kalksteinwerke Basic aggregate for the production of steel
US3681050A (en) * 1970-03-27 1972-08-01 Aikoh Co Agent for desulfurizing molten pig iron

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172758A (en) * 1965-03-09 Oxygen process for producing high
US3028232A (en) * 1953-05-06 1962-04-03 Voest Ag Process for blowing pig-iron
US2790712A (en) * 1955-04-26 1957-04-30 Mannesmann Ag Process for refining iron
US3202504A (en) * 1961-08-07 1965-08-24 Heber J Hamlet Process for refining and improving the quality of steel and other ferrous metals
US3262772A (en) * 1962-07-06 1966-07-26 Gusstahlwerk Witten Ag Process for the production of alloy steels
US3585025A (en) * 1967-07-27 1971-06-15 Rheinische Kalksteinwerke Basic aggregate for the production of steel
US3536475A (en) * 1967-11-17 1970-10-27 Battelle Memorial Institute Method of making pellets from a finely divided solid material
US3681050A (en) * 1970-03-27 1972-08-01 Aikoh Co Agent for desulfurizing molten pig iron

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589915A (en) * 1984-02-28 1986-05-20 O.E.T. Metalconsult S.R.L. Additive for metallurgic liquids being effective to improve the characteristics of metal or metal alloy articles of manufacture

Also Published As

Publication number Publication date
FR2126367A1 (de) 1972-10-06
AT333811B (de) 1976-12-10
JPS517443B1 (de) 1976-03-08
SE392915B (sv) 1977-04-25
DE2207530B2 (de) 1974-12-05
BE779766A (nl) 1972-08-24
GB1352277A (en) 1974-05-08
NL7102540A (de) 1972-08-29
LU64843A1 (de) 1972-07-05
DE2207530A1 (de) 1972-09-07
FR2126367B1 (de) 1976-07-09
ATA143472A (de) 1976-04-15
DE2207530C3 (de) 1975-07-24
IT949195B (it) 1973-06-11

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