EP1776491A4 - Production de titane - Google Patents

Production de titane

Info

Publication number
EP1776491A4
EP1776491A4 EP05752414A EP05752414A EP1776491A4 EP 1776491 A4 EP1776491 A4 EP 1776491A4 EP 05752414 A EP05752414 A EP 05752414A EP 05752414 A EP05752414 A EP 05752414A EP 1776491 A4 EP1776491 A4 EP 1776491A4
Authority
EP
European Patent Office
Prior art keywords
pellets
titanium metal
powders
method defined
semi
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.)
Withdrawn
Application number
EP05752414A
Other languages
German (de)
English (en)
Other versions
EP1776491A1 (fr
Inventor
Kannapar Mukunthan
Ivan Ratchev
Andrew Arthur Shook
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.)
Metalysis Ltd
Original Assignee
BHP Billiton Innovation Pty Ltd
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
Priority claimed from AU2004903532A external-priority patent/AU2004903532A0/en
Application filed by BHP Billiton Innovation Pty Ltd filed Critical BHP Billiton Innovation Pty Ltd
Publication of EP1776491A1 publication Critical patent/EP1776491A1/fr
Publication of EP1776491A4 publication Critical patent/EP1776491A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/26—Electrolytic production, recovery or refining of metals by electrolysis of melts of titanium, zirconium, hafnium, tantalum or vanadium
    • C25C3/28—Electrolytic production, recovery or refining of metals by electrolysis of melts of titanium, zirconium, hafnium, tantalum or vanadium of titanium
    • 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
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/129—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining metallic titanium from titanium compounds by dissociation, e.g. thermic dissociation of titanium tetraiodide, or by electrolysis or with the use of an electric arc
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C5/00—Electrolytic production, recovery or refining of metal powders or porous metal masses
    • C25C5/04—Electrolytic production, recovery or refining of metal powders or porous metal masses from melts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates to the production of titanium metal and titanium metal alloys.
  • the present invention relates particularly, although by no means exclusively, to a method of producing semi-finished or ready-to-use products, such as products in sheet, bar, tube and other forms, of titanium metal (which term includes titanium alloy) from titanium oxide powders and/or pellets.
  • These processes include chemical reduction of TiCl 4 with molten magnesium or sodium metal in a sealed reactor that has been evacuated and back-filled with an inert gas.
  • the material in the hot reactor is vacuum distilled to vaporise magnesium and sodium metal and chlorides.
  • the reactor is allowed to cool and the solid material, ie titanium sponge, is then recovered from the reactor.
  • the titanium sponge may be processed by two process routes.
  • One process route includes melting the sponge in an inert atmosphere and forming ingots from the melt. Thereafter, the ingots are then converted into semi-finished or ready-to-use products, such as sheet, bar, tube and other forms, by hot working techniques such as forging, rolling and extrusion.
  • the other process route includes crushing the sponge into particulate form, typically powders, and directly compacting particles into semi-finished or ready-to-use products using standard powder metallurgy processing, such as roll compaction.
  • Kroll and Hunter products formed by the direct compaction route is poor weldability when welded using arc welding technology.
  • the poor weldability has been attributed to high levels of chlorine, typically 1000-1500 ppm, in the products reacting with tungsten electrodes causing unstable arcs when arc welding the products.
  • the Kroll process was the source technology for the titanium sponge used by Du Pont in the Du Pont technology.
  • the chlorine was present in amounts greater than 50 ppm.
  • Du Pont was not able to reduce the concentration of chlorine in the titanium metal or otherwise solve the poor weldability problem caused by the chlorine and consequently Du Pont did not commercialise the technology.
  • the applicant has been carrying out extensive research into an electrochemical method for reducing metal oxides, such as titania.
  • the electrochemical method of the applicant is an alternative technology to the Kroll and Hunter processes.
  • the electrochemical method of the applicant is concerned with reducing a metal oxide in a solid state in an electrolytic cell of the type that includes an anode, a cathode, and a molten electrolyte that includes cations of a metal that is capable of chemically reducing the metal oxide.
  • the International application focuses particularly on reducing titanium oxides, such as titania, to titanium metal.
  • the electrochemical method of the applicant is characterised by a step of operating the cell at a potential that is above a potential at which cations of the metal that is capable of chemically reducing the metal oxide can deposit as the metal on the cathode, whereby the metal chemically reduces the metal oxide.
  • the chlorine in the Kroll and Hunter products formed by the direct compaction route appears to be in a more volatile form that readily reacts with tungsten welding electrodes and makes the arcs unstable.
  • titanium metal which term includes titanium alloy
  • semi-finished or ready-to-use products from titanium oxide powders and/or pellets which includes the steps of:
  • step (b) processing the titanium metal powders and/or pellets produced in step (a) and forming semi-finished or ready-to-use products having a concentration of chlorine of at least 100 ppm.
  • the chlorine concentration of the semi-finished or ready-to-use products produced by step (b) may be at least 200 ppm, typically may be at least 500 ppm, and more typically may be at least 1000 ppm without affecting adversely the weldability of the products.
  • the chlorine concentration of the semi-finished or ready-to- use products is less than 2000 ppm.
  • the titanium oxide powders and/or pellets have a size of 3.5 mm or less in a minor dimension of the powders and/or pellets.
  • the "minor" dimension will be the diameter of the powders and/or pellets and the reference to "minor” dimension is not significant.
  • the reference to "minor” dimension is significant. For example, in a situation in which the pellet is disc shaped with a cylindrical side wall and flat top and bottom walls and a diameter of 20mm and a thickness of 2mm, identifying the dimension to be measured as the minimum dimension is an important consideration.
  • the size of the titanium oxide powders and/or pellets is less than 2.5 mm.
  • the size of the powders and pellets is 1-2 mm.
  • step (a) includes electrochemically reducing titanium oxide to titanium metal having a concentration of oxygen that is no more than 0.5% by weight.
  • oxygen concentration is no more than 0.3% by weight.
  • oxygen concentration is no more than 0.1% by weight.
  • the electrolyte is a CaCl 2 -based electrolyte that includes CaO as one of the constituents.
  • step (a) includes maintaining the cell potential above the decomposition potential for CaO.
  • step (a) includes maintaining the cell potential below the decomposition potential for CaCl 2 .
  • Step (a) may be carried out on a batch, continuous, or semi-continuous basis.
  • step (a) may be carried out on a continuous or semi-continuous basis as described in International application PCT/AU03/001657 in the name of the applicant.
  • the disclosure in the International application is incorporated herein by cross reference.
  • step (b) includes processing the titanium metal powders and/or pellets produced in step (a) by quenching the titanium metal powders and/or pellets from an elevated temperature to a lower temperature at which there is a comparatively low rate of oxidation of titanium metal in air.
  • the lower temperature is ambient temperature.
  • step (b) includes quenching the titanium metal powders and/or pellets with water.
  • Step (b) may include processing the titanium metal powders and/or pellets produced in step (a) by compacting titanium metal powders and/or pellets into semi-finished or ready-to-use products.
  • step (b) may include the steps of roll compacting the titanium metal powders and/or pellets into strip, sintering the strip to increase the mechanical properties of the strip, ant cold rolling the sintered strip into sheet.
  • step (b) may include processing the titanium metal powders and/or pellets produced in step (a) by powder metallurgically processing the titanium metal powders and/or pellets into semi-finished or ready- to-use products other than by roll compacting the powders and/or pellets.
  • step (b) includes compacting the titanium metal powders and/or pellets to form semi ⁇ finished or ready-to-use products, such as products in sheet, bar, tube and other forms.
  • a titanium metal semi-finished or ready-to-use product having a concentration of chlorine of at least 100 ppm produced by the above-described method.
  • the chlorine concentration of the semi-finished or ready-to-use products may be at least 200 ppm, typically may be at least 500 ppm, and more typically may be at least 1000 ppm without affecting adversely the weldability of the products.
  • the chlorine concentration of the semi-finished or ready-to- use products is less than 2000 ppm.
  • the NTC samples were prepared by the following procedure.
  • the titanium metal pellets produced in accordance with the method described in International application PCT/AU03/0030 were of the order of 15mm.
  • the pellets were washed to remove retained electrolyte and thereafter processed to remove carbides adhered to the surface of the pellets.
  • the pellets were then crushed to a particle size of 1-1.5mm and washed again to remove further retained electrolyte.
  • the particles were then die compacted to a density of 80-85% and thereafter sintered to increase the density to 85-90%.
  • the particles were then cold rolled to form fully dense strips, ie strips having a density of at least 98%, and cut into the strips of the above-mentioned size.
  • the WM samples were formed by cutting small strips of the above-mentioned size from titanium strip having a chlorine concentration of less than 20ppm produced from Kroll or Hunter products formed by the remelting route.
  • the WK samples were made from commercially available Kroll or Hunter powders formed by the direct compaction route into fully dense strips by the same sequence of die compacting, sintering, and cold rolling steps described above in relation to the MTC samples and then cut into the strips of the above-mentioned size.
  • An initial weld run was made on an austenitic stainless steel strip with approximately the same dimensions as the titanium metal strips to establish the welding parameters and shielding effectiveness.
  • the titanium metal strips were welded using standard practice for titanium in an inert gas enclosure using GTAW.
  • the samples NTC(I) TO NTC(3) produced in accordance with the present invention were weldable with good arc stability and good weld bead appearance.
  • samples WK(I) to WK(4) made from Kroll/Hunter powders and pellets having 1000-1500ppm chlorine were easily identified by arc instability, unacceptable weld beads and severe electrode erosion.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Powder Metallurgy (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

L'invention concerne un procédé permettant de produire des produis en titane semi-finis ou prêts à l'emploi à partir de poudres et/ou de pastilles d'oxyde de titane. Ledit procédé permet de fabriquer des produits qui ne sont pas affectés de manière négative y par des niveaux de chlore ayant un impact sur une performance, notamment, la soudabilité de produits fabriqués à l'aide d'autres procédés.
EP05752414A 2004-06-28 2005-06-23 Production de titane Withdrawn EP1776491A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2004903532A AU2004903532A0 (en) 2004-06-28 Production of titanium
PCT/AU2005/000907 WO2006000025A1 (fr) 2004-06-28 2005-06-23 Production de titane

Publications (2)

Publication Number Publication Date
EP1776491A1 EP1776491A1 (fr) 2007-04-25
EP1776491A4 true EP1776491A4 (fr) 2007-10-10

Family

ID=35781502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05752414A Withdrawn EP1776491A4 (fr) 2004-06-28 2005-06-23 Production de titane

Country Status (10)

Country Link
US (1) US20070181436A1 (fr)
EP (1) EP1776491A4 (fr)
JP (1) JP2008504438A (fr)
CN (1) CN101018894A (fr)
AU (1) AU2005256146B2 (fr)
BR (1) BRPI0512782A (fr)
CA (1) CA2572300A1 (fr)
RU (1) RU2370575C2 (fr)
WO (1) WO2006000025A1 (fr)
ZA (1) ZA200700107B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101006204A (zh) * 2004-06-22 2007-07-25 Bhp比利顿创新公司 金属氧化物的电化学还原
WO2006010229A1 (fr) * 2004-07-30 2006-02-02 Bhp Billiton Innovation Pty Ltd Reduction electrochimique d'oxydes metalliques
BRPI0513992A (pt) * 2004-07-30 2008-05-20 Bhp Billiton Innovation Pty processo para minimização da re-oxidação de material reduzido e processo para redução eletroquìmica de um material de alimentação de óxido metálico
AT509526B1 (de) * 2010-02-26 2012-01-15 Univ Wien Tech Verfahren und vorrichtung zur herstellung von metallen aus ihren oxiden
RU2424085C1 (ru) * 2010-03-29 2011-07-20 Государственное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский политехнический университет" Способ получения газопоглотителя из порошка титана
GB201208698D0 (en) * 2012-05-16 2012-06-27 Metalysis Ltd Electrolytic method,apparatus and product
CN109082686B (zh) * 2018-09-20 2020-04-07 成都先进金属材料产业技术研究院有限公司 棒状形貌钛粉及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016594A1 (fr) * 2001-08-16 2003-02-27 Bhp Billiton Innovation Pty Ltd Procede de fabrication de produits a base de titane ou d'alliages de titane

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
US2225373A (en) * 1937-07-29 1940-12-17 Norman P Goss Method and apparatus for casting metal
DK156731C (da) * 1980-05-07 1990-01-29 Metals Tech & Instr Fremgangsmaade til fremstilling af metal eller metalloid
US4521281A (en) * 1983-10-03 1985-06-04 Olin Corporation Process and apparatus for continuously producing multivalent metals
GB9812169D0 (en) * 1998-06-05 1998-08-05 Univ Cambridge Tech Purification method
US6143241A (en) * 1999-02-09 2000-11-07 Chrysalis Technologies, Incorporated Method of manufacturing metallic products such as sheet by cold working and flash annealing
WO2001062994A1 (fr) * 2000-02-22 2001-08-30 Qinetiq Limited Procede de fabrication de ferro-titane et d'autres alliages metalliques par reduction electrolytique
GB2359564B (en) * 2000-02-22 2004-09-29 Secr Defence Improvements in the electrolytic reduction of metal oxides
AU2002356516A1 (en) * 2001-09-12 2003-03-24 F.W. Gartner Thermal Spraying Company Nanostructured titania coated titanium
JP2003129268A (ja) * 2001-10-17 2003-05-08 Katsutoshi Ono 金属チタンの精錬方法及び精錬装置
CN1650051B (zh) * 2002-03-13 2011-02-23 Bhp比利顿创新公司 在电解池中还原金属氧化物
AUPS117002A0 (en) * 2002-03-13 2002-04-18 Bhp Billiton Innovation Pty Ltd Minimising carbon transfer in an electrolytic cell
JP2004156130A (ja) * 2002-09-11 2004-06-03 Sumitomo Titanium Corp 直接電解法による金属チタン製造用酸化チタン多孔質焼結体およびその製造方法
EP1581672B1 (fr) * 2002-12-12 2017-05-31 Metalysis Limited Reduction electrochimique d'oxydes metalliques
JP2004360025A (ja) * 2003-06-05 2004-12-24 Sumitomo Titanium Corp 直接電解法による金属チタンの製造方法
JP2004360053A (ja) * 2003-06-09 2004-12-24 Sumitomo Titanium Corp 直接電解法による低炭素金属チタンの製造方法
JP4347089B2 (ja) * 2004-03-01 2009-10-21 株式会社大阪チタニウムテクノロジーズ Ｃａ還元によるＴｉ又はＴｉ合金の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016594A1 (fr) * 2001-08-16 2003-02-27 Bhp Billiton Innovation Pty Ltd Procede de fabrication de produits a base de titane ou d'alliages de titane

Also Published As

Publication number Publication date
US20070181436A1 (en) 2007-08-09
EP1776491A1 (fr) 2007-04-25
ZA200700107B (en) 2008-05-28
RU2007103181A (ru) 2008-08-10
BRPI0512782A (pt) 2008-04-08
AU2005256146B2 (en) 2010-11-25
CN101018894A (zh) 2007-08-15
WO2006000025A1 (fr) 2006-01-05
RU2370575C2 (ru) 2009-10-20
AU2005256146A1 (en) 2006-01-05
JP2008504438A (ja) 2008-02-14
CA2572300A1 (fr) 2006-01-05

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