US20070068344A1 - Ore reduction process and titanium oxide and iron metallization product - Google Patents

Ore reduction process and titanium oxide and iron metallization product Download PDF

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Publication number
US20070068344A1
US20070068344A1 US11/512,993 US51299306A US2007068344A1 US 20070068344 A1 US20070068344 A1 US 20070068344A1 US 51299306 A US51299306 A US 51299306A US 2007068344 A1 US2007068344 A1 US 2007068344A1
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United States
Prior art keywords
agglomerates
slag
furnace
carbon
ferrous oxide
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Abandoned
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US11/512,993
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English (en)
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John Barnes
Stephen Lyke
Dat Nguyen
Akira Uragami
Isao Kobayashi
Mitsutaka Hino
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EIDP Inc
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Individual
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Priority to US11/512,993 priority Critical patent/US20070068344A1/en
Assigned to E. I. DU PONT DE NEMOURS AND COMPANY reassignment E. I. DU PONT DE NEMOURS AND COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NGUYEN, DAT, LYKE, STEPHEN ERWIN, BARNES, JOHN JAMES, HINO, MITSUTAKA, KOBAYASHI, ISAO, URAGAMI, AKIRA
Publication of US20070068344A1 publication Critical patent/US20070068344A1/en
Priority to US12/430,261 priority patent/US7780756B2/en
Priority to US12/838,899 priority patent/US20100285326A1/en
Abandoned legal-status Critical Current

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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
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/006—Starting from ores containing non ferrous metallic oxides
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • 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
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12049—Nonmetal component
    • Y10T428/12056—Entirely inorganic

Definitions

  • the disclosure relates to a process for the beneficiation of titanium oxide-containing ores. More particularly the disclosure relates to a process for reducing the ore in a moving hearth furnace to form separable iron metal and titanium oxides.
  • the disclosure additionally relates to a titanium and iron metallization product and the product of a process for the beneficiation of titanium oxide-containing ores. More particularly the disclosure relates to a titanium oxides and iron metallization product made by a process for reducing the ore in a moving hearth furnace to form separable iron metal and titanium oxides.
  • Moving hearth furnaces have been described for use in the reduction of iron oxide.
  • Iron oxide to be reduced is charged to the rotary hearth furnace together with a source of carbon wherein the charge is exposed to reducing conditions to form reduction products comprising iron and slag.
  • a carbon bed may be provided to protect the hearth from contact with the reacting charge. Since the carbon content of the charge is sufficient to provide rapid metallization, any minor proportion of ferrous oxides that might remain to react with the carbon bed would be an incidental and insignificant part of the process.
  • a rotary hearth process to reduce low grade ores such as ilmenite which contain iron oxide, high levels of titanium dioxide and metal oxide impurities has been proposed for making reduction products containing metallic iron and high grade titanium oxides such as synthetic rutile.
  • reducing a low grade ore such as ilmenite which contains high levels of titanium dioxide and metal oxide impurities in a rotary hearth process poses processing challenges that are not encountered when reducing relatively pure iron oxide.
  • the disclosure is directed to a process for producing separable iron and titanium oxides from an ore containing titanium oxide and ferric oxide, typically a low grade ore rich in titanium oxides and ferric oxide, even more typically ilmenite, comprising:
  • the reducing and melting of the agglomerates occurs simultaneously. Additionally, the metallizing can be carried out under conditions sufficient for small molten iron metal droplets formed in the molten slag to coalesce into large molten iron metal droplets.
  • the disclosure is additionally directed to a metallization product of a ferrous oxide-rich molten slag, comprising: a matrix of a titanium oxide-rich slag having a plurality of metallic iron granules distributed there through, the metallic iron granules being mechanically separable from the matrix of titanium oxide, the matrix comprising greater than 85% titanium oxides based on the entire weight of the matrix after mechanical separation of the mechanically separable portion of the metallic iron.
  • FIG. 1 is a top view of a rotary hearth furnace for the reduction of titanium-rich ores and production of iron metal and high grade titanium oxides.
  • FIG. 2 is a simplified schematic diagram of the process of this disclosure.
  • FIG. 3 is an electron micrograph of 75 micron size slag product of Example 1. Full field width is 115 microns.
  • FIG. 4 is a photographic image of the separated iron granules of the product of Example 3.
  • FIG. 5 is an electron micrograph of less than 75 micron size slag product after separation of iron granules of Example 3. Full field width is 115 microns.
  • FIG. 6 is an optical micrograph of a metallization product of a process similar to Example 3 before grinding.
  • the disclosure uses a low grade ore rich in titanium oxides and iron oxides. Titanium present in low grade ore occurs in complex oxides, usually in combination with iron, and also containing oxides of other metals and alkaline earth elements. Titanium is commonly found as ilmenites, either as a sand or a hard rock deposit.
  • Low-grade titanium-rich ores such as ilmenite sand can contain from about 45 to about 65% titanium dioxide, about 30 to about 50% iron oxides and about 5 to about 10% gangue.
  • Rock deposits of ilmenite are reported to contain from about 45 to about 50% titanium dioxide, about 45 to about 50% iron oxides, and about 5 to about 10% gangue.
  • the process of this disclosure can employ such titanium-rich ores.
  • Agglomerates useful as the charge to the rotary hearth process, comprise the ore and a quantity of carbon sufficient for a first stage melting wherein ferric oxide reduction to ferrous oxide occurs under reducing conditions.
  • the exact amount of carbon will vary depending upon the iron oxide content of the ore, and particularly upon the ferric oxide content. But, less than stoichiometric quantities of carbon (i.e., quantities of carbon sufficient to reduce all the iron oxides in the ore to metallic iron) are used so that the agglomerates will melt before a second stage metallizing wherein the majority of the ferrous oxide reduction to iron metal occurs. A minor degree of such metallizing may occur in the first stage and is not detrimental to the process of this disclosure.
  • the amount of carbon when the amount of carbon is referred to it means the fixed carbon content of the material which provides a source of carbon.
  • Fixed carbon content is determined in the proximate analysis of solid fuels, such as coal, by heating a sample, in the absence of air, to 950° C. to remove volatile matter (which typically includes some carbon). The carbon that remains in the ash at 950° C. is the fixed carbon content.
  • the amount of carbon can range from about 0.5 to about 8.0 wt. %, more typically about 1.0 to about 6.0 wt. % based on the entire weight of the agglomerate.
  • the amount of carbon can range from about 1.0 to about 8.0 wt. %, more typically about 2.0 to about 6.0 wt. % based on the entire weight of the agglomerate.
  • the amount of carbon can range from about 0.5 to about 5.0 wt. %, more typically about 1.0 to about 3.0 wt. % based on the entire weight of the agglomerate.
  • the amount of carbon in the agglomerates is sufficient for reducing the ferric oxide but insufficient to metallize more than about 50% of the ferrous oxide, more typically insufficient to metallize more than about 20% of the ferrous oxide based on the agglomerate.
  • the carbon source useful in the agglomerates can be any carbonaceous material such as, without being limited thereto, coal, coke, charcoal and petroleoum coke.
  • Agglomerates are formed by mixing the ore and the carbon source, optionally together with a binder material, and shaping the mixture into pellets, briquettes, extrudates or compacts which are usually dried at temperatures ranging from about 100 to about 200° C.
  • Equipment capable of mixing and shaping the feed components are well known to those skilled in the art.
  • the agglomerates range in average diameter from about 2 to about 4 cm for ease of handling.
  • the optional binder material can be, without limitation thereto, organic binders or inorganic binders such as bentonite or hydrated lime. Suitable amounts of binder range from about 0.5 to about 5 wt. %, typically about 1 to about 3 wt. % based on the entire weight of the agglomerates.
  • the ore of the agglomerates can be used without being ground into a fine powder.
  • the ore may, however, be crushed and/or screened, before being formed into agglomerates, to an average particle size ranging from about 0.1 to about 1 mm to separate out any large chunks which might pose handling problems.
  • rock deposits are used, they are usually crushed and screened to obtain ore particles ranging in average size of about 0.1 to about 1 mm.
  • the agglomerates are charged to a rotary hearth furnace wherein they are heated to a temperature sufficient for the first stage melting to produce a ferrous oxide-rich molten slag.
  • the agglomerates are charged through a feed chute which deposits them onto a bed of carbonaceous material, typically a bed of coal or coke particles.
  • the thickness of the bed can range from about 1 to about 5 cm.
  • the temperatures inside the moving hearth furnace sufficient for the first stage melting can range from about 1300° C. to about 1800° C., typically from about 1400° C. to about 1750° C., and more typically from about 1500° C. to about 1700° C.
  • the particular temperature will depend on ore composition.
  • the period of time for this melting stage can range from about 1 minute to about 5 minutes.
  • the carbon content of the agglomerates is sufficient to reduce the ferric oxide to ferrous oxide, but insufficient to complete any substantial metallization and, additionally, not sufficient for the complete reduction of ferrous oxide to iron metal.
  • the temperature inside the moving hearth furnace in the second stage metallizing is sufficiently high to keep the slag in a molten state as the ferrous oxide metallization occurs.
  • Suitable temperatures inside the hearth furnace for this purpose can range from about 1500° C. to about 1800° C., typically from about 1600° C. to about 1750° C., and more typically from about 1600° C. to about 1700° C.
  • the particular temperature required will vary depending upon ore composition.
  • the temperature inside the furnace in the first stage can be at least about 100° C. lower than the temperature in the second stage.
  • the period of time for this second stage metallizing can be longer than that for the first stage melting and can range from about 5 minutes to about 20 minutes.
  • reduction of ferric oxide in the presence of the carbon contained in the agglomerates and melting occur rapidly.
  • allowing sufficient time for the ferrous oxide-rich molten slag to flow over the carbon bed during the metallization can enhance production of large metal particles since the iron droplets of the molten slag will coalesce into larger droplets which maintain their size during cooling to form solid metal particles.
  • the slag becomes less fluid and the titanium concentration of the slag increases.
  • the conditions sufficient for maintaining slag fluidity can help the iron droplets in the molten slag to coalesce which facilitates the formation of the easily separable large particles of iron.
  • the metallization is carried out until at least about 90% completion, based on the agglomerates, even more preferably until at least about 95% completion.
  • the iron metal which can be in the form of large granules is readily separable from the solid slag by cost effective processes. Mechanical processes are ideally used for separating the iron metal. Chemical processes such as chemical leaching are not needed. Additionally extensive mechanical separation processes such as intensive grinding are not needed.
  • Typical methods for separating the metal include crushing, grinding, screening and magnetic separation.
  • the iron granules of the process range in average diameter from about 0.05 to about 10 mm, and more typically from about 0.1 to about 5 mm.
  • the term “granules” is used to distinguish the large chunks of metallic iron produced by the process of this disclosure as compared to the small particles of metallic iron resulting from conventional processes.
  • the solid slag product of the process comprises greater than about 85% titanium oxides, and more typically greater than about 87% titanium oxides, based on the entire weight of the solid slag product, after separation of the mechanically separable metallic iron.
  • titanium oxides means TiO 2 , Ti 3 O 5 , and Ti 2 O 3 .
  • the solid slag product may also contain smaller amounts of titanium in the form of TiO, TiC and TiN.
  • the solid slag product may contain a minor amount of residual metallic iron.
  • the residual metallic iron is usually the portion of metallic iron particles below about 50 microns in diameter.
  • the amount of residual metallic iron is less than about 6%, more typically less than about 4% based on the entire weight of the solid slag product, after mechanical separation of the mechanically separable metallic iron granules.
  • impurities such as FeO, and other oxides.
  • the amount of these other impurities is usually less than 8% and more typically less than 6% of the entire weight of the solid slag product.
  • the moving hearth furnace can be any furnace which is capable of exposing the agglomerates to at least two high temperature zones on a bed of carbon.
  • a suitable furnace can be a tunnel furnace, a tube furnace or a rotary hearth furnace.
  • the process can employ a single furnace structure.
  • a rotary hearth furnace is used for reducing the charge.
  • a furnace 10 is used having dimensions of a typical hearth furnace used in the iron production industry.
  • the rotary hearth furnace has a surface 30 that is rotatable from a feed material zone 12 .
  • the surface 30 can be a refractory layer surface or a vitreous hearth layer, both of which are well known in the art of hearth furnace processing of iron ores.
  • the surface rotates from the feed material zone through a plurality of burner zones 14 , 16 , 17 , a reaction zone spanning at least a portion of the burner zones and a discharger zone 18 that comprises a cooling plate 48 and discharge device 28 .
  • the maximum temperature of the furnace is typically reached in zone 17 .
  • the first and second stages of the process of this disclosure occur in the reaction zone.
  • the surface 30 is rotatable in a repetitive manner from the discharge zone 18 to the feed material zone 12 and through the reaction zone for continuous operation.
  • the burner zones can each be fired by a plurality of air/fuel, oil fired, coal fired or oxygen enriched burners 20 and 22 .
  • the feed material zone 12 includes an opening 24 and a feed mechanism 26 by which the agglomerates are charged to the furnace.
  • a layer comprising carbon is located on at least a major proportion of the surface 30 , typically the entire surface comprises a layer comprising carbon and upon which the agglomerates are placed.
  • the layer comprising carbon may be placed on the surface by any convenient means, typically by a solid material conveyor 34 .
  • the agglomerates can be leveled to a useful height above the surface by a leveler 29 that spans the width of the surface 30 .
  • the agglomerates are continuously fed to the furnace by the feed mechanism as the surface is rotated around the furnace and through each zone. The speed of rotation is controlled by adjusting a variable speed drive.
  • the process is shown whereby the ore is introduced to the mixing zone 51 .
  • the carbon can be introduced to a size reduction zone 50 prior to introduction to the mixing zone 51 wherein the ore and the carbon together with any optional additives, such as binders, are mixed together and formed into agglomerates.
  • the agglomerates are introduced to rotary hearth furnace zone 52 wherein the ferric oxide of the agglomerates is reduced and metallized as described herein.
  • the hot product 42 as shown in FIG. 1 is cooled by any convenient means such as quenching with water.
  • the cooled product is then screened in the screening zone 53 , then ground in grinding zone 54 to separate the iron metal from the high grade titanium oxides product.
  • Recycle material can also be separated and introduced to the mixing zone 51 .
  • the iron metal product may be formed into briquettes in briquetting zone 55 from which the iron metal product is withdrawn.
  • tube furnaces of conventional design using a high purity alumina tube as a retort may be used. These furnaces may be heated to temperatures of about 1500° C. to about 1700° C., and operated under a nitrogen or argon atmosphere.
  • coal or coke particles are added to the charge during the second phase metallization in order to provide more reductant contact thereby enhancing the metallization process
  • the undersized slag (synthetic rutile) and iron-synthetic rutile composites are separated from the titanium oxides product and recycled to the process.
  • the invention herein can be construed as excluding any element or process step that does not materially affect the basic and novel characteristics of the composition or process. Additionally, the invention can be construed as excluding any element or process step not specified herein.
  • Tablets were prepared by mixing and compacting together, at ambient temperature, 79.7 percent by weight ilmenite ore (61% TiO 2 , based on the total weight of the ore), and 20.3 percent coal (71% fixed carbon, based on proximate analysis) into cylinders 20 mm in diameter and 7 mm thick. Residual water was removed from the tablets by drying. The dried tablets were placed on a bed of coke breeze in an alumina crucible and moved into a tube furnace which had been heated to 1600° C. under a nitrogen atmosphere. The tube furnace is of conventional design using a high purity alumina tube as a retort. The furnace temperature dropped on the order of about 50° C. when the tablets were initially added. The temperature increased back to the starting temperature.
  • FIG. 3 An electron micrograph of full field width 115 microns of the product of this Example after grinding is shown in FIG. 3 (ground product particles were mounted in resin, cut, polished and imaged in the electron microscope such that residual iron particles appear bright and titanium oxide-rich material appears grey). As shown in FIG. 3 , the slag matrix contained many small (less than 10 micron) particles of metallic iron which could not be effectively removed by typical grinding and sieving separation processes.
  • Tablets were prepared by mixing and compacting together, at ambient temperature, 95.5 percent by weight ilmenite ore (61% TiO 2 , based on the total weight of the ore), 3 percent coal (71% fixed carbon), and 1.5 percent wheat flour binder into cylinders 20 mm in diameter and 7 mm thick. A small amount of binder was needed because of the lower carbon content of the tablets. Residual water was removed from the tablets by drying. The dried tablets were placed on a bed of coke breeze in an alumina crucible and moved into a tube furnace which had been heated to 1600° C. under a nitrogen atmosphere. The furnace temperature dropped on the order of about 50° C. when the tablets were initially added. The temperature gradually increased back to the starting temperature.
  • Tablets were prepared by mixing and compacting together, at ambient temperature, 93.5 percent by weight ilmenite ore (61% TiO 2 ), 5.5 percent coal (71% fixed carbon), and 1 percent wheat flour binder into cylinders 20 mm in diameter and 7 mm thick. Residual water was removed from the tablets by drying. The dried tablets were placed on a bed of coke breeze in an alumina crucible and moved into a furnace which had been heated to 1675° C. under an argon atmosphere. The furnace temperature dropped on the order of about 50° C. when the tablets were initially added. The temperature gradually increased back to the starting temperature. 25 minutes after the tablets were added, the tablets were removed and allowed to cool. Distortion and glassy appearance indicated that the tablets had melted and re-solidified.
  • Iron metallization was found to be greater than 95% based on quantitative x-ray diffraction analysis.
  • the average metallic iron granule size was more than 500 microns with 95% of the entire amount of separated granules greater than 75 microns. Nearly all of the iron could be removed from the finer, titanium oxide-rich phase by crushing and sieving with a 200 mesh sieve. Elemental analysis by ion-coupled plasma atomic emission spectroscopy determined that the titanium oxide-rich phase contained 87% titanium oxide (titanium content reported as TiO 2 with sum of metal oxide concentrations normalized to 100%). X-ray diffraction analysis indicated that the titanium was mostly present as Ti 3 O 5 with some Ti 2 O 3 .
  • FIG. 4 is a photographic image (full field width 12.5 mm) of the iron granules which were mechanically separated from the product made according to Example 3.
  • FIG. 5 is an electron micrograph (full field width 115 microns) of the less than 75 micron slag product after grinding and removal of the iron granules by sieving (separated slag product particles were mounted in resin, cut, polished and imaged in the electron microscope such that residual iron particles appear bright and titanium oxide-rich material appears grey). Comparing FIG. 5 with FIG. 3 , the ground product of FIG. 3 contained a significant content of iron metal and the iron metal particles were small, making them difficult to separate by mechanical means. However, the slag product shown in FIG. 5 shows few particles of iron metal remaining within the solid slag product after separation of the larger iron metal granules ( FIG. 4 ) by grinding and sieving.
  • FIG. 6 is a polished cross section of a product of a process similar to Example 3 before grinding. Even at the relatively large scale of the figure, some of the iron granules are visible.

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Organic Chemistry (AREA)
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US11/512,993 2005-08-30 2006-08-30 Ore reduction process and titanium oxide and iron metallization product Abandoned US20070068344A1 (en)

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US11/512,993 US20070068344A1 (en) 2005-08-30 2006-08-30 Ore reduction process and titanium oxide and iron metallization product
US12/430,261 US7780756B2 (en) 2005-08-30 2009-04-27 Ore reduction process and titanium oxide and iron metallization product
US12/838,899 US20100285326A1 (en) 2005-08-30 2010-07-19 Ore reduction process and titanium oxide and iron metallization product

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US78817306P 2006-03-31 2006-03-31
US11/512,993 US20070068344A1 (en) 2005-08-30 2006-08-30 Ore reduction process and titanium oxide and iron metallization product

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EP (1) EP1929051B1 (fr)
JP (1) JP2009507134A (fr)
CN (1) CN102605126A (fr)
AU (2) AU2006284620B2 (fr)
CA (1) CA2616394A1 (fr)
DE (1) DE602006018967D1 (fr)
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RU (1) RU2441922C2 (fr)
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AT506896B1 (de) 2008-06-06 2010-05-15 Siemens Vai Metals Tech Gmbh Verfahren zur steuerung eines transformationsverfahrens
CN102414530B (zh) * 2009-05-05 2014-11-19 纳幕尔杜邦公司 用于钛矿石提选的耐火衬
BR112012029016B1 (pt) 2010-05-18 2023-03-28 Tata Steel Limited Processo de redução direta e produto de escória
CA2803903C (fr) * 2010-06-30 2016-02-16 Keki Hormusji Gharda Procede d'extraction de metaux contenus dans des residus et des minerais alumino-ferreux et titano-ferreux
CN104508151A (zh) * 2012-08-03 2015-04-08 株式会社神户制钢所 金属铁的制造方法
JP2014214330A (ja) * 2013-04-23 2014-11-17 株式会社神戸製鋼所 金属鉄の製造方法
JP2014043645A (ja) * 2012-08-03 2014-03-13 Kobe Steel Ltd 金属鉄の製造方法
CA3005810C (fr) * 2015-11-18 2022-06-21 Mintek Procede de fusion d'ilmenite ameliore
CN108315512B (zh) * 2018-02-28 2019-12-31 攀钢冶金材料有限责任公司 一种提钛尾渣脱氯脱碳的方法

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CN102605126A (zh) 2012-07-25
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US7780756B2 (en) 2010-08-24
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AU2006284620B2 (en) 2010-12-16
US20100285326A1 (en) 2010-11-11
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