US3867131A - Metallurgical production method - Google Patents

Metallurgical production method Download PDF

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Publication number
US3867131A
US3867131A US365522A US36552273A US3867131A US 3867131 A US3867131 A US 3867131A US 365522 A US365522 A US 365522A US 36552273 A US36552273 A US 36552273A US 3867131 A US3867131 A US 3867131A
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US
United States
Prior art keywords
gases
concentrate
combustion
heater
furnace
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Expired - Lifetime
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US365522A
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English (en)
Inventor
Folk Engstrom
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Ahlstrom Corp
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Ahlstrom Corp
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
    • 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
    • C22B5/00—General methods of reducing to metals
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/961—Treating flue dust to obtain metal other than by consolidation

Definitions

  • 75/25 dust recovery from the exhaust gases may take place 2,805, 29 9/1957 Udy U 75/34 in several steps, whereby the process involves several 2,988,442 6/1961 Tanner 75 34 prgheaters 3,033,673 5/1962 Collin 75/34 5 Claims, 2 Drawing Figures /2 F 7 l l a l /O l 6 2 1 METALLURGICAL PRODUCTION METHOD BACKGROUND OF THE INVENTION 1.
  • Field of the Invention relates to a method for prereducing concentrate in a metallurgical process in a rotating cylinder furnace working according to the counter-current principle.
  • the invention is applicable to, for example, the production of chrome iron from poorgrade chromium ore.
  • the chromium/iron ratio can be improved by reducing the surplus iron into metallic iron by means of coke carbon and by separating it before smelting.
  • the reduction usually takes place in a rotating cylinder furnace according to the counter-current principle, using heavy oil and/or carbon monoxide for fuel.
  • the temperature of the exhaust gases is high and the gases contain unburnt reaction products such as H and C0.
  • the rotating cylinder furnace in which the reduction takes place is long and demands a great deal of space.
  • the required furnace length grows when the production increases.
  • the problems connected with the operation increase along with the furnace length.
  • the fuel oil and coke necessary for the reduction process contain sulphur, which is partially transferred into the reduced product.
  • the influence of sulphur as a component in a mixture is usually disadvantageous and therefore a low sulphur content is desirable.
  • the present invention provides a process of the character once described, which comprises burning in an after-combustion chamber, the still unburnt components in the exhaust gases emerging from the cylinder furnace,
  • the invention aims at improving the efficiency of the production process, which is achieved by utilizing the energy contained in the exhaust gases.
  • a further objective is to provide a process in-which the reduction furnace size is smaller thanthat of furnaces previously in use.
  • a still further advantage achieved by the invention is that the losses in dust become minimal.
  • FIG. 1 is a schematic illustration in block form show ing the lay-out of a process according to the invention.
  • FIG. 2 illustrates an alternative embodiment of such lay-out.
  • FIG. 1 shows a reduction furnace. Pre-heated primary air 2 and oil 3 are fed into one end and the reumbled product 4 is removed from it. Gases 5 emerge from the other end of the furnace and pre-heated concentrate 6 and coke 7 are fed into it.
  • the exhaust gases of the furnace contain unburnt components which are burned in after-combustion chamber 8, into which preheated combustion air 9 is fed.
  • Gases l0 emerging from the after-combustion furnace and ground concentrate 11 are fed together into a cyclone pre-heater 12, where the preheated concentrate is separated from gases 13, which are conducted into an air pre-heater l4. Gases 15 are fed from the air pr-heater 14 into gas purification units.
  • After-combustion may take place before the cyclone pre-heater as shown in FIG. 1 and/or after it.
  • the system may contain several cyclone pre-heaters l6, 17 (FIG. 2), in which case the pre-heating of the feed material takes place in several steps.
  • the system can contain several afteecombustion chambers l8, 19. in which case the temperature of the gases after the cyclones can be controlled before the air pre-heater.
  • After-combustion may also take place after the air pre-heater.
  • the chromium concentrate is pre-heated in cyclones to 6001000C.
  • the pre-heating temperature of air is about 500C.
  • the energy saving in comparison to the previous method is about 40 percent.
  • the furnace is about 30 percent shorter.
  • the efficiency of the process can be improved even further by feeding water vapor into the hottest furnace part where it produces an endothermal reaction to gether with carbon. In this manner the gas temperature levels in the longitudinal direction of the furnace, and greater amounts of energy can be fed into the furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Incineration Of Waste (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
US365522A 1972-06-12 1973-05-31 Metallurgical production method Expired - Lifetime US3867131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI721668A FI48852C (fi) 1972-06-12 1972-06-12 Metallurginen valmistusmenetelmä

Publications (1)

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US3867131A true US3867131A (en) 1975-02-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
US365522A Expired - Lifetime US3867131A (en) 1972-06-12 1973-05-31 Metallurgical production method

Country Status (4)

Country Link
US (1) US3867131A (fi)
JP (1) JPS5133762B2 (fi)
FI (1) FI48852C (fi)
FR (1) FR2187926B1 (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0654538A1 (de) * 1993-11-20 1995-05-24 Metallgesellschaft Aktiengesellschaft Wälzverfahren zur Aufarbeitung von Zink, Blei und Eisenoxide enthaltenden Materialien

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373244A (en) * 1943-08-19 1945-04-10 Holz Frank Blast furnace process
US2805929A (en) * 1953-03-10 1957-09-10 Strategic Udy Metallurg & Chem Process for obtaining iron from material containing iron oxides
US2988442A (en) * 1958-03-20 1961-06-13 Tanner Gustaf Reduction of iron ore by hydrocarbons
US3033673A (en) * 1960-05-03 1962-05-08 Elektrokemisk As Process of reducing iron oxides

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1246248A (fr) * 1959-10-03 1960-11-18 Procédé de réduction de minerai de fer dans un four tournant et dispositif pour la mise en oeuvre du procédé
DE1226126B (de) * 1963-06-28 1966-10-06 Rheinstahl Ind Planung G M B H Verfahren zur Reduktion von Eisenerzen im Drehrohrofen mit fluessigen oder gasfoermigen Kohlenwasserstoffen und Vorrichtung zur Durchfuehrung dieses Verfahrens
BE675317A (fi) * 1965-01-19 1966-05-16

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373244A (en) * 1943-08-19 1945-04-10 Holz Frank Blast furnace process
US2805929A (en) * 1953-03-10 1957-09-10 Strategic Udy Metallurg & Chem Process for obtaining iron from material containing iron oxides
US2988442A (en) * 1958-03-20 1961-06-13 Tanner Gustaf Reduction of iron ore by hydrocarbons
US3033673A (en) * 1960-05-03 1962-05-08 Elektrokemisk As Process of reducing iron oxides

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0654538A1 (de) * 1993-11-20 1995-05-24 Metallgesellschaft Aktiengesellschaft Wälzverfahren zur Aufarbeitung von Zink, Blei und Eisenoxide enthaltenden Materialien

Also Published As

Publication number Publication date
FI48852B (fi) 1974-09-30
FR2187926B1 (fi) 1976-05-07
JPS4962312A (fi) 1974-06-17
FI48852C (fi) 1975-01-10
FR2187926A1 (fi) 1974-01-18
JPS5133762B2 (fi) 1976-09-21

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