US3765871A - Method for controlling the amount of silicon contained as an impurity in high carbon ferrochromium - Google Patents

Method for controlling the amount of silicon contained as an impurity in high carbon ferrochromium Download PDF

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Publication number
US3765871A
US3765871A US00231326A US3765871DA US3765871A US 3765871 A US3765871 A US 3765871A US 00231326 A US00231326 A US 00231326A US 3765871D A US3765871D A US 3765871DA US 3765871 A US3765871 A US 3765871A
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United States
Prior art keywords
aluminum oxide
magnesium oxide
high carbon
group
silicon
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Expired - Lifetime
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US00231326A
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English (en)
Inventor
S Eda
H Iwabuchi
K Yamagishi
K Nakagawa
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JFE Engineering Corp
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Nippon Kokan Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/003—Making ferrous alloys making amorphous alloys

Definitions

  • ABSTRACT A method for controlling the amount of silicon contained as an impurity in high carbon ferrochromium which, when there is smelted high carbon ferrochromium by reducing raw chromium ores in a submerged arcfurnace, consists in mixing fine chromium ores being used with proper amounts of other crushed raw materials rich in magnesium oxide or aluminum oxide fully to match the weight ratio of the magnesium oxide to the aluminum oxide both contained as impurities in said raw chromium ores, whereby the proportion of silicon contained in the alloyed product can be controlled as desired by carrying out said mixing to such extent that the weight ratio of the magnesium oxide to the aluminum oxide present in the mixture attains a value indicated by any point on the correlation curve of the attached chart.
  • the object of this invention is to provide a method for easily manufacturing high carbon ferrochromium containing desired amounts of metallic impurity silicon from raw chromium ores of any description.
  • This object can be attained in accordance with the present invention by mixing raw chromium ores being used with proper amounts of other raw materials rich in magnesium oxide or aluminum oxide according to the correlation curve (indicated in the figure of appended drawing) found by the present inventors for the first time to exist between the weight ratio of the magnesium oxide to the aluminum oxide both contained in the mixed ores so as to bring said ratio to a sufficient level to obtain a desired silicon content in the ferrochromium product, and finally smelting the raw materials thus mixed.
  • the single curve shown in the chart of appended figure was obtained from a large number of experiments carried out by the present inventors for the first time, as represented by the numerous plotted points on the chart. Said curve presents a correlation between the 0.6 to 2.0 weight ratio of the magnesium oxide to the aluminum oxide both contained in the raw materials and the 9 to 0.5 silicon content of high carbon ferrochromium obtained from the materials.
  • Raw materials rich in magnesium oxide include, for example, magnesia clinker, dolomite, magnesite, dunite and serpentine, and raw materials rich in aluminum oxide include, for example, corundum, bauxite, hydrated aluminous ore and aluminous shale.
  • this invention enables the amount of silicon contained as an impurity in the ferroalloy product to be easily controlled to any desired value falling within the aforesaid range regardless of the composition of raw chromium ores being used.
  • the principle of this invention may be applicable not only to the manufacture of high carbon ferrochromium but also, as naturally expected, to the production of high carbon ferromanganese, high carbon ferromolybdenum, high carbon ferrotitanium and high carbon ferronickel.
  • the manufacture of the latter group of ferroalloys may be effected simply by experimentally determining a correlation curve similar to that illustrated in the appended drawing.
  • Example 2 This example relates to the manufacture of high carbon ferrochrornium'containing.2 to 3% of silicon as an impurity. In this case, the conventional method failed to produce high carbon ferrochromium having said desired silicon content from the fine chromium ore of Table 2, though it effected said production from the lump chromium ore A of said Table.
  • the weight ratio of the magnesium oxide to the aluminum oxide contained in the mixture amounted to about 1.4.
  • the pelletized mixture was smelted in the same manner as in Example 1, easily obtaining high carbon ferrochromium containing the desired amount of silicon. Power consumption was about 3,800 KWl-l per 1,000 Kg of product.
  • Example 3 There was prepared referential high carbon ferrochromium according to the conventional method only from the screened powders of the lump chromium ore B of Table 2. As apparent from the appended curve chart, however, this process failed to provide high carbon ferrochromium containing 2 to 3% of silicon as an impurity.
  • a method for controlling the amount of silicon contained as an impurity in a high carbon ferrochromium containing between about 2 to 8% by weight carbon which comprises selecting a silicon content for said ferrochromium between about 0.5 to 9% by weight, providing a material mixture by mixing raw chromium ore with an amount of other raw material rich in oxide selected from the group consisting of aluminum oxide and magnesium oxide so that the quantities of magnesium oxide and aluminum oxide in said material mixture substantially correspond to the point on the curve of the annexed drawing at which said selected silicon content and the weight ratio of MgO and A1 0 intersect and smelting said material mixture charged in a submerged arc furnace in the presence of a reducing.
  • a method for producing ferrochromium containing between about 2 to 8% by weight carbon and a controlled amount of silicon between about 0.5 to 9% by weight which comprises:
  • a material mixture by mixing raw chromium ore with other raw material rich in oxide selected from the group consisting of aluminum oxide and magnesium oxide so that the quantities of magnesium oxide and aluminum oxide in said material mixture substantially correspond to the point on the curve of the annexed drawing at which said selected silicon content and the weight ratio of MgO and M 0 intersect, forming said material mixture into shaped bodies selected from the group consisting of pellets and briquettes, and smelting said shaped bodies of material mixture in the presence of coke in a submerged arc furnace.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Carbon And Carbon Compounds (AREA)
US00231326A 1971-03-10 1972-03-02 Method for controlling the amount of silicon contained as an impurity in high carbon ferrochromium Expired - Lifetime US3765871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46012688A JPS5017289B1 (de) 1971-03-10 1971-03-10

Publications (1)

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US3765871A true US3765871A (en) 1973-10-16

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Country Status (6)

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US (1) US3765871A (de)
JP (1) JPS5017289B1 (de)
DE (1) DE2211440C3 (de)
FR (1) FR2129550A5 (de)
NO (1) NO128619B (de)
ZA (1) ZA721603B (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923471A (en) * 1926-01-15 1933-08-22 Arnold Christian Manufacture of steel
US2674529A (en) * 1952-02-20 1954-04-06 Union Carbide & Carbon Corp Manufacture of low-carbon stainless steel
US2934422A (en) * 1958-04-30 1960-04-26 Strategic Udy Metallurgical & Chemical Processes Ltd Process for the production of ferrochromium products

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923471A (en) * 1926-01-15 1933-08-22 Arnold Christian Manufacture of steel
US2674529A (en) * 1952-02-20 1954-04-06 Union Carbide & Carbon Corp Manufacture of low-carbon stainless steel
US2934422A (en) * 1958-04-30 1960-04-26 Strategic Udy Metallurgical & Chemical Processes Ltd Process for the production of ferrochromium products

Also Published As

Publication number Publication date
DE2211440B2 (de) 1974-01-31
DE2211440A1 (de) 1972-09-21
JPS5017289B1 (de) 1975-06-19
FR2129550A5 (de) 1972-10-27
ZA721603B (en) 1972-11-29
NO128619B (de) 1973-12-17
DE2211440C3 (de) 1974-08-22

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