US3294524A - Method of briquetting ore - Google Patents

Method of briquetting ore Download PDF

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Publication number
US3294524A
US3294524A US405377A US40537764A US3294524A US 3294524 A US3294524 A US 3294524A US 405377 A US405377 A US 405377A US 40537764 A US40537764 A US 40537764A US 3294524 A US3294524 A US 3294524A
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US
United States
Prior art keywords
coal
pellets
iron oxide
briquetting
fines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US405377A
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English (en)
Inventor
Eugene A Pelczarski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United States Steel Corp
Original Assignee
United States Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United States Steel Corp filed Critical United States Steel Corp
Priority to US405377A priority Critical patent/US3294524A/en
Priority to GB43097/65A priority patent/GB1124804A/en
Priority to DE19651458794 priority patent/DE1458794A1/de
Application granted granted Critical
Publication of US3294524A publication Critical patent/US3294524A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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

Definitions

  • This invention relates to an improved method of briquetting iron oxide fines with a bituminous coal binder.
  • iron oxide fines Before iron oxide fines can be changed to a blast furnace or similar reducing reactor, they must be formed into agglomerates large enough not to be blown from the furnace.
  • the agglomerates must have sufficient mechanical strength to avoid excessive degradation in handling at ordinary temperatures, and also to withstand temperatures and conditions encountered in blast furnace operation.
  • limestone or dolomite can be included in the agglomerates in quantities to make them sel-i-fiuxing.
  • Briquetting is one of several processes currently used for agglomerating iron oxide fines. Usually a briquetting process involves pressing the fines into pillow-shaped bodies under high pressures in a roll-type press.
  • the fines can be briquetted at high temperatures without a binder, or at lower temperatures with a binder, such as bituminous coal, pitch, molasses, sulfite liquor and others.
  • a bituminous coal binder serves an additional purpose of ifurnishing carbon which can be used in the reducing reactions in a furnace.
  • An object of my invention is to provide an improved method of briquetting iron oxide fines with a bituminous coal binder in which the iron oxide and coal are heated and mixed in a single step without destroying the bonding properties of the coal, thereby avoiding the handling and equipment problems of the other method.
  • a more specific object is to provide a briquetting method which attains the foregoing advantages by virtue of pelletizing a mixture of iron oxide fines, bituminous coal fines and preferably a flux, heating the pelletized mixture to the briquetting temperature, and compacting the heated mixture.
  • the single figure is a diagrammatic representation of apparatus suitable for performing my briquetting method.
  • the iron oxide and flux particles are of a size suitable for pelletizing, commonly minus inch or finer.
  • the coal particles preferably are minus 8 mesh.
  • the mixture has a coal content of about to 15 percent and preferably sufiicient ice flux to make the product self-fluxing.
  • the minus 4 inch starting material contains only a small percentage of particles which are close to A inch in size. Some of these particles may not enter into pellets when 1 limit the pellet size to about A. inch, but the number of such particles is negligible.
  • a conveyor 12 carries pellets from the pelletizing device to a direct gas-fired kiln 13, where I heat them to an apparent temperature of about 600 to 800 F.
  • the heated pellets discharge from the kiln through an insulated chute 14, which carries them directly to a conventional briquetting press 15, illustrated as of the roll-type. Exhaust gases discharge from the other end of the kiln. I compact the pellets into pillow-shaped briquettes under a load of about 30,000 to 65,000 pounds per linear inc-h of eifective roll width and while their temperature remains in the foregoing range.
  • the pellets of course break on reaching the press, but the pelletized form of the mix protects the coal particles against overheating and oxidizing in the kiln.
  • the briquettes discharge from the press to a conveyor 16, which carries them out of contact with air to a suitable cooler, not shown.
  • the nonpelletized mix caused serious dust-loading in the kiln, which the pelletized mix avoided.
  • Microscopic examination of the heated mixes as they came from the kiln showed a wide temperature distribution in the coal particles with the kiln feed that was not pelletized.
  • my invention affords a simple method of forming iron oxide briquettes with a bituminous coal binder. By pelletizing the materials before heating, 1 am able to avoid the handling problems encountered in heating the materials separately, yet produce satisfactory briquettes.
  • a method of briquetting iron oxide fines with a bituminous coal binder comprising pelletizing a mixture of iron oxide and bituminous coal particles to form pellets having a coal content of 5 to 15 percent, heating the pellets to a temperature in the range of about 600 to 800 F., and compacting the pellets into briquettes directly following the heating step while their temperature remains in said range.
  • a method of briquetting iron oxide fines with a bituminous coal binder comprising feeding to a pelletizing device minus inch iron oxide fines, minus 4 inch fines of a flux selected from the group consisting of limestone, dolomite and mixtures thereof, minus 8 mesh bituminous coal fines, and water, the coal being in proportions to produce a coal content of about 5 to 15 percent, the flux being in proportions to produce a self-fiuxing product,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US405377A 1964-10-21 1964-10-21 Method of briquetting ore Expired - Lifetime US3294524A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US405377A US3294524A (en) 1964-10-21 1964-10-21 Method of briquetting ore
GB43097/65A GB1124804A (en) 1964-10-21 1965-10-11 Method of briquetting ore
DE19651458794 DE1458794A1 (de) 1964-10-21 1965-10-21 Verfahren zum Brikettieren von Eisenoxydteilchen mit einem Fettkohlebindemittel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US405377A US3294524A (en) 1964-10-21 1964-10-21 Method of briquetting ore

Publications (1)

Publication Number Publication Date
US3294524A true US3294524A (en) 1966-12-27

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ID=23603464

Family Applications (1)

Application Number Title Priority Date Filing Date
US405377A Expired - Lifetime US3294524A (en) 1964-10-21 1964-10-21 Method of briquetting ore

Country Status (3)

Country Link
US (1) US3294524A (de)
DE (1) DE1458794A1 (de)
GB (1) GB1124804A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753683A (en) * 1970-12-28 1973-08-21 Dravo Corp Method and apparatus for carbonizing and desulfurizing coal-iron compacts
EP2298941A4 (de) * 2008-07-11 2016-10-19 Kobe Steel Ltd Brikettherstellungsverfahren, verfahren zur herstellung eines reduktionsmaterials und zink- oder blei-trennverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753683A (en) * 1970-12-28 1973-08-21 Dravo Corp Method and apparatus for carbonizing and desulfurizing coal-iron compacts
EP2298941A4 (de) * 2008-07-11 2016-10-19 Kobe Steel Ltd Brikettherstellungsverfahren, verfahren zur herstellung eines reduktionsmaterials und zink- oder blei-trennverfahren

Also Published As

Publication number Publication date
DE1458794A1 (de) 1969-02-13
GB1124804A (en) 1968-08-21

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