WO1994004709A1 - Amelioration de materiaux titaniferes - Google Patents

Amelioration de materiaux titaniferes Download PDF

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Publication number
WO1994004709A1
WO1994004709A1 PCT/AU1993/000414 AU9300414W WO9404709A1 WO 1994004709 A1 WO1994004709 A1 WO 1994004709A1 AU 9300414 W AU9300414 W AU 9300414W WO 9404709 A1 WO9404709 A1 WO 9404709A1
Authority
WO
WIPO (PCT)
Prior art keywords
titaniferous
compounds
upgrading
leaching
phase
Prior art date
Application number
PCT/AU1993/000414
Other languages
English (en)
Inventor
Michael John Hollitt
Ross Alexander Mcclelland
John Roger Tuffley
Original Assignee
Technological Resources Pty. Limited
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 Technological Resources Pty. Limited filed Critical Technological Resources Pty. Limited
Priority to CA002137812A priority Critical patent/CA2137812C/fr
Priority to JP6505674A priority patent/JPH08500393A/ja
Priority to AU46915/93A priority patent/AU678375C/en
Priority to EP93917451A priority patent/EP0658214A4/fr
Priority to TW082107810A priority patent/TW492947B/zh
Publication of WO1994004709A1 publication Critical patent/WO1994004709A1/fr

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Classifications

    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C22B1/02—Roasting processes
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • C22B3/10—Hydrochloric acid, other halogenated acids or salts thereof
    • 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
    • C22B34/1204—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
    • 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
    • C22B34/1204—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
    • C22B34/1209—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent by dry processes, e.g. with selective chlorination of iron or with formation of a titanium bearing slag
    • 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
    • C22B34/1204—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
    • C22B34/1213—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 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent by wet processes, e.g. using leaching methods or flotation techniques
    • 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
    • Y02P10/20—Recycling

Definitions

  • This invention relates to the removal of impurities from naturally occurring and synthetic titaniferous materials.
  • the invention is particularly suited to the enhancement of titaniferous materials used in the production of titanium metal and titanium dioxide pigments by means of industrial chlorination systems.
  • Embodiments of the present invention have the common feature of roasting of titaniferous materials in the presence of additives and at temperatures which encourage the formation of a liquid oxide or glassy phase, followed at some stage by cooling and aqueous leaching as steps in an integrated process. Additional steps may be employed as will be described below.
  • titanium dioxide bearing feedstocks are fed with coke to chlorinators of various designs (fluidised bed, shaft, molten salt), operated to a maximum temperature in the range 700 - 1200C.
  • the most common type of industrial chlorinator is of the fluidised bed design. Gaseous chlorine is passed through the titania and carbon bearing charge, converting titanium dioxide to titanium tetrachloride gas, which is then removed in the exit gas stream and condensed to liquid titanium tetrachloride for further purification and processing.
  • the chlorination process as conducted in industrial chlorinators is well suited to the conversion of pure titanium dioxide feedstocks to titanium tetrachloride. However, most other inputs (i.e.
  • Preferred inputs to chlorination are therefore high grade materials, with the mineral rutile (at 95-96% TiO 2 ) the most suitable of present feeds. Shortages of rutile have led to the development of other feedstocks formed by upgrading naturally occurring ilmenite (at 40-60% TiO 2 ), such as titaniferous slag (approximately 86% TiO 2 ) and synthetic rutile (variously 92-95% TiO 2 ). These upgrading processes have had iron removal as a primary focus, but have extended to removal of magnesium, manganese and alkali earth impurities, as well as some aluminium. Elemental Chlorination Condensation Purification
  • titaniferous minerals e.g. ilmenite
  • the titaniferous mineral is reduced with coal or char in a rotary kiln, at temperatures in excess of 1100 C.
  • the iron content of the mineral is substantially metallised.
  • Sulphur additions are also made to convert manganese impurities partially to sulphides.
  • the metallised product is cooled, separated from associated char, and then subjected to aqueous aeration for removal of virtually all contained metallic iron as a separable fine iron oxide.
  • the titaniferous product of separation is treated with 2-5% aqueous sulphuric acid for dissolution of manganese and some residual iron.
  • aqueous sulphuric acid for dissolution of manganese and some residual iron.
  • Recent disclosures have provided a process which operates reduction at lower temperatures and provides for hydrochloric acid leaching after the aqueous aeration and iron oxide separation steps. According to these disclosures the process is effective in removing iron, manganese, alkali and alkaline earth impurities, a substantial proportion of aluminium inputs and some vanadium as well as thorium.
  • the process may be operated as a retrofit on existing kiln based installations. However, the process is ineffective in full vanadium removal and has little chemical impact on silicon.
  • ilmenite is first thermally reduced to substantially complete reduction of its ferric oxide content (i.e. without substantial metallisation), normally in a rotary kiln.
  • the cooled, reduced product is then leached under 35 psi pressure at 140-150 C with excess 20% hydrochloric acid for removal of iron, magnesium, aluminium and manganese.
  • the leach liquors are spray roasted for regeneration of hydrogen chloride, which is recirculated to the leaching step.
  • the ilmenite undergoes grain refinement by thermal oxidation followed by thermal reduction (either in a fluidised bed or a rotary kiln).
  • the cooled, reduced product is then subjected to atmospheric leaching with excess 20% hydrochloric acid, for removal of the deleterious impurities. Acid regeneration is also performed by spray roasting in this process.
  • ilmenite is thermally reduced (without metallisation) with carbon in a rotary kiln, followed by cooling in a non-oxidising atmosphere.
  • the cooled, reduced product is leached under 20 - 30 psi gauge pressure at 130°C with 10 - 60% (typically 18 - 25%) sulphuric acid, in the presence of a seed material which assists hydrolysis of dissolved titania, and consequently assists leaching of impurities.
  • Hydrochloric acid usage in place of sulphuric acid has been claimed for this process. Under such circumstances similar impurity removal to that achieved with other hydrochloric acid based systems is to be expected. Where sulphuric acid is used radioactivity removal will not be complete.
  • a commonly adopted method for upgrading of ilmenite to higher grade products is to smelt ilmenite at temperatures in excess of 1500°C with coke addition in an electric furnace, producing a molten titaniferous slag (for casting and crushing) and a pig iron product.
  • molten titaniferous slag for casting and crushing
  • pig iron product Of the problem impurities only iron is removed in this manner, and then only incompletely as a result of compositional limitations of the process .
  • a titaniferous ore is treated by alternate leaching with an aqueous solution of alkali metal compound and an aqueous solution of a mineral acid (US Patent No. 5,085,837).
  • the process is specifically limited to ores and concentrates and does not contemplate prior processing aimed at artificially altering phase structures. Consequently the process requires the application of excessive reagent and harsh processing conditions to be even partially effective and is unlikely to be economically implemented to produce a feedstock for the chloride pigment process.
  • a wide range of potential feedstocks is available for upgrading to high titania content materials suited to chlorination.
  • Examples of primary titania sources which cannot be satisfactorily upgraded by prior art processes for the purposes of production of a material suited to chlorination include hard rock (non detrital) ilmenites, siliceous leucoxenes, many primary (unweathered) ilmenites and large anatase resources.
  • Many such secondary sources e.g. titania bearing slags also exist.
  • the present invention provides a combination of processing steps which may be incorporated into more general processes for the upgrading of titaniferous materials, rendering such processes applicable to the treatment of a wider range of feeds and producing higher quality products than would otherwise be achievable.
  • the present invention provides a process for upgrading a titaniferous material by removal of impurities which process includes the steps of :-
  • step (i) heating a titaniferous material to a temperature less than 1300°C to produce a solid titaniferous phase and a liquid oxide or glassy phase in the presence of sufficient of compounds which encourage the formation of the liquid oxide or glassy phase; (ii) cooling the product of step (i) to form a solidified material comprising the titaniferous phase and an impurity bearing phase at a rate sufficient to ensure the susceptibility of the impurity bearing phase to leaching in either an acid or alkaline leachant; and
  • the titaniferous material In order to ensure the formation of the solid titaniferous phase and the liquid oxide or glassy phase during the heating step it will normally be necessary to add to the titaniferous material, prior to the heating step, sufficient of a compound that encourages the formation of the liquid oxide or glassy phase. However, in some cases it will not be necessary since the titaniferous material itself may contain sufficient of such a compound.
  • the process of the invention can remove iron, magnesium and other alkaline earths, alkalis, manganese, silica, phosphorus, alumina, vanadium, rare earths, thorium and other radioactive elements, which impurities form an almost comprehensive list of impurities in titaniferous mineral sources. From most materials a product purity of greater than 96% TiO 2 can be obtained.
  • Compounds added to the titaniferous material may be mixed therewith by any means ranging from direct mixing of additives prior to charging to thermal treatment to more complex feed preparations such as the formation of agglomerates or nodules of mixed products, to briquette production from feeds and additives. Many additives will be effective.
  • sodium, potassium, lithium, phosphorus, silicon and boron compounds and minerals e.g. borax, trona and other alkali metal carbonates, spodumene, caustic soda
  • Additives may be incorporated individually or in combination with other additives.
  • the formation of a glassy phase by addition of alkali compounds can be achieved without the formation of alkali titanate phases, reduced alkali titanate phases (e.g. NaTiO 2 - compounds and solid solutions) or alkali ferric titanate phases (e.g. Na(Fe, A1)O 2 - TiO 2 phases known as "bronzes") in roasting. Where such titanate phases form their stability with respect to subsequent leaching steps is such that the final product quality is adversely affected.
  • further additives e.g. boron or phosphorus compounds
  • Thermal processing residence time at temperature will depend on the nature of the additives and the feed, as well as the operating temperature. Residence times of from 5 minutes to five hours have been effective, allowing thermal processing residence times to be set to most suit other requirements in integrated processing.
  • the level of additive used and the conditions applied in thermal processing should be such that glassy phase formation does not exceed the limitations set by materials handling constraints in the thermal processing step. For example, where glassy phase formation exceeds about 15% by volume of the roasted material it must be anticipated that accretion and bed fusion problems will occur.
  • Cooling of the thermally treated material should be conducted in such a manner as to limit the reversion of the glassy phase to crystalline phases, i.e. should be at a sufficient rate to a temperature at which the liquid glass solidifies as to ensure the formation of at least a portion of solid glass rather than complete formation of crystalline products. Further, cooling should be conducted under an environment appropriate to the conditions of thermal treatment (i.e. reduction processing will require cooling in an oxygen free environment).
  • the aqueous leaching step need not necessarily follow directly after the presently disclosed thermal processing step.
  • the thermal processing step may be optionally followed by a reduction step prior to aqueous leaching. Further, crushing/grinding of the thermally processed material to enhance subsequent leach performance may be undertaken.
  • the conditions necessary to conduct effective leaching will depend on the nature of the original feed and the additives .
  • addition of soda ash and borax to siliceous leucoxene in accordance with the present disclosure will result in a product which can be leached in sodium silicate solution formed directly from the thermally treated material; the active leachant in this case is simply water.
  • the active leachant in this case is simply water.
  • caustic soda solution or acid will be an effective leachant.
  • Leaching will generally benefit substantially by use of high temperature (e.g. 80°C or above), although it has not been necessary to use pressure leaching to achieve effective conditions. Nevertheless it is presently disclosed that pressure leaching can be effectively and successfully applied. Lower temperatures can also be used, although with penalties in process kinetics.
  • Leaching may be conducted in any circuit configuration, including batch single or multiple stage leaching, continuous co ⁇ urrent multistage leaching, or continuous countercurrent multistage leaching. For most circumstances two stage cocurrent leaching will be most beneficial. Average residence time may vary from 30 minutes to 10 hours, depending on process conditions. Any leach vessel capable of providing adequate shear may be used. Simple stirred tank vessels are applicable.
  • the leach liquor may be separated from the mineral by any suitable means, including thickening, filtration and washing.
  • the mineral product may then pass on to other steps in an integrated process .
  • a further acid leach may follow the disclosed leaching step, particularly where the titaniferous feed has a content of alkalis or alkaline earths .
  • reagent regeneration e.g. caustic regeneration, hydrochloric acid regeneration, sulphuric acid regeneration
  • a physical separation step may be employed at any stage (e.g. a final magnetic separation to remove grains containing iron, such as chromite).
  • Sodium carbonate addition corresponding to 4.25% Na 2 O by weight, was made to a titania concentrate whose composition is given in Table 1.
  • the mixture was homogenised and pelletised, and the pellets were heated in air to 1000°C for 4 hours.
  • the thus roasted pellets were quenched in liquid nitrogen and then crushed to pass a screen of 200 microns aperture.
  • Sodium silicate solution was used to simulate leaching using water as leachant under conditions where the leach liquors are recycled to leaching after solid/liquid separation).
  • the original concentrate was known to contain silica primarily as quartz inclusions in titanate grains.
  • X-ray diffraction analysis after roasting indicated extinction of all crystalline phases containing silica.
  • a glassy phase containing 16% Na 2 O, 46% SiO 2 , 9% Al 2 O 3 , 26% TiO 2 and 3% Fe 2 O 3 was identified in the roasted material by electron microscopy.
  • Sodium titanates and sodium iron titanium bronze were also identified (along with rutile) by these techniques, indicating that conditions were not optimised.
  • titania concentrates of the composition given in Table 2 were used as titaniferous material for treatment.
  • Two batches of hand pressed pellets were prepared as follows. A 100g sample of the concentrates (previously ground to passing a screen aperture of 30 microns) was blended in each case with 1.1% of the appropriate additive or additive mixture and the resulting blends were pressed into pellets. The first batch was prepared with 1.1 wt% of anhydrous borax addition while the second batch was prepared with addition of 1.1 wt% of 1 : 1 Na 2 B 4 O 7 :Na 2 O.
  • Each batch of pellets was roasted for two hours in a 7 : 1 H 2 /CO 2 atmosphere at 1000°C and then removed to cool quickly in the same atmosphere.
  • the roasted pellets were ground to pass a screen aperture of 75 microns for subsequent leaching.
  • Ground roasted pellets were caustic leached under reflux conditions for 6 hours in a 10% NaOH solution at 6.7% solids density. Solid/liquid separation was effected by filtration, and the caustic leached products were washed and dried in preparation for subsequent acid leaching.
  • the caustic leached residues were acid leached in 15% HCl for 4 hours under reflux, then similarly filtered, washed and dried.
  • samples of the concentrate and roasted material were submitted for X-ray diffraction analysis. While quartz and various ilmenite, anatase and rutile related phases were identified in the concentrates the only crystalline phases identified in the roasted product were rutile and ilmenite. All quartz had entered a glassy phase, and no titanate phases which would reduce leach effectiveness were identified.
  • Example 2 The same pellet formulations as indicated in Example 2 were made up in 350 kg batches in an agglomeration plant and roasted at 30 kg/hr feed rate with 15% brown coal char addition to a final temperature of 1000°C in a small (0.5m diameter) rotary kiln. Residence time above 900°C was approximately 10 minutes. There were no problems with accretions or bed fusion, and after separation from residual char the products had exactly the same properties as the roasted products of Example 2.
  • a commercial titania slag product having the composition indicated in Table 4 was processed as for the processing conditions indicated in Example 2, but with 2 wt% anhydrous borax addition in place of the other additives.
  • the caustic leach was conducted at 165°C under pressure, and a pressure leach with 20% sulphuric acid conducted at 135°C was used in place of the hydrochloric acid leach.
  • the final residue was calcined at 900°C for one hour.
  • the products of this treatment are indicated in Table 4.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
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  • Glass Compositions (AREA)

Abstract

L'invention se rapporte à un procédé d'amélioration d'un matériau titanifère, consistant à enlever les impuretés contenues dans le matériau, en particulier les radionuclides. Le procédé consiste à chauffer le matériau titanifère à une température inférieure à 1300 °C pour former une phase titanifère solide et un oxyde liquide ou une phase vitreuse en présence d'un matériau qui favorise la formation de telles phases, à faire refroidir le produit à une vitesse qui maintient la phase vitreuse en état amorphe, et à lessiver le matériau solidifié avec un acide ou un alcali pour en enlever les impuretés. Les matériaux favorisant la formation des phases requises comprennent les composés de métaux alcalins et de bore, tels que le borax, la soude caustique, la soude calcinée et la silice.
PCT/AU1993/000414 1992-08-14 1993-08-12 Amelioration de materiaux titaniferes WO1994004709A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002137812A CA2137812C (fr) 1992-08-14 1993-08-12 Enrichissement de materiaux titaniferes
JP6505674A JPH08500393A (ja) 1992-08-14 1993-08-12 チタン鉄材料の品質改善
AU46915/93A AU678375C (en) 1992-08-14 1993-08-12 Upgrading titaniferous materials
EP93917451A EP0658214A4 (fr) 1992-08-14 1993-08-12 Amelioration de materiaux titaniferes.
TW082107810A TW492947B (en) 1993-08-12 1993-09-22 Process for upgrading titaniferous material by removal of impurities

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPL4105 1992-08-14
AUPL410592 1992-08-14
AUPL7193 1993-02-10
AUPL719393 1993-02-10

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US08379566 A-371-Of-International 1995-08-09
US09/819,095 Continuation US20020104406A1 (en) 1992-08-14 2001-04-26 Upgrading titaniferous materials

Publications (1)

Publication Number Publication Date
WO1994004709A1 true WO1994004709A1 (fr) 1994-03-03

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PCT/AU1993/000414 WO1994004709A1 (fr) 1992-08-14 1993-08-12 Amelioration de materiaux titaniferes

Country Status (7)

Country Link
US (2) US20020104406A1 (fr)
EP (1) EP0658214A4 (fr)
JP (1) JPH08500393A (fr)
CN (1) CN1043154C (fr)
IN (1) IN190922B (fr)
MY (1) MY109520A (fr)
WO (1) WO1994004709A1 (fr)

Cited By (7)

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WO1995024510A1 (fr) * 1994-03-08 1995-09-14 Rgc Mineral Sands Limited Lessivage de materiaux titaniferes
WO1995028503A1 (fr) * 1994-04-15 1995-10-26 Technological Resources Pty Ltd Traitement de liqueurs de lessivage pour la valorisation de materiaux titaniferes.
WO1995028502A1 (fr) * 1994-04-15 1995-10-26 Technological Resources Pty. Ltd. Lessivage d'un materiau titanifere
WO1997019199A1 (fr) * 1995-11-21 1997-05-29 Qit-Fer Et Titane Inc. Procede d'enrichissement des scories d'oxyde de titane et produit obtenu
US5679131A (en) * 1996-03-13 1997-10-21 Photran Corporation Method for producing titanium oxide from ore concentrates
EP0900855A1 (fr) * 1997-08-11 1999-03-10 Billiton SA Limited Production de scorie de titane
US6627165B2 (en) * 1994-04-15 2003-09-30 Technological Resources Pty Ltd Process for upgrading a titaniferous material containing silica

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BR0304443B1 (pt) * 2003-10-28 2012-08-21 processo para obtenção de concentrados de titánio com elevado teor de tio2 e baixo teor de radionuclìdeos a partir de concentrados mecánicos de anatásio.
US7588741B2 (en) * 2004-03-30 2009-09-15 Dunn Jr Wendell E Cyclical vacuum chlorination processes, including lithium extraction
US7625536B2 (en) * 2005-10-18 2009-12-01 Millennium Inorganic Chemicals, Inc. Titaniferous ore beneficiation
CN102505121A (zh) * 2011-09-26 2012-06-20 抚顺钛业有限公司 一种酸洗降低海绵钛中氯杂质的方法
AU2017301099B2 (en) * 2016-07-29 2019-02-21 RMM Capital Pty Ltd A metallurgical process for upgrading ferro-titaniferous mineral concentrate using time dependent magnetic fields
CN106319205B (zh) * 2016-08-02 2018-07-13 华北理工大学 一种改善钒钛磁铁烧结矿转鼓强度的新型添加剂
US10662127B2 (en) 2017-08-28 2020-05-26 8 Rivers Capital, Llc Oxidative dehydrogenation of ethane using carbon dioxide
CN108774692B (zh) * 2018-06-13 2020-07-28 长江师范学院 一种采用高钙镁钛铁矿制备富钛料的方法及其制备的富钛料
CN111646502B (zh) * 2020-06-10 2022-08-02 攀钢集团研究院有限公司 一种渣矿混合连续酸解浸取方法及设备
WO2024057024A1 (fr) * 2022-09-15 2024-03-21 Fodere Titanium Limited Procédé de production de dioxyde de titane et/ou d'oxyde de vanadium

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Cited By (13)

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WO1995024510A1 (fr) * 1994-03-08 1995-09-14 Rgc Mineral Sands Limited Lessivage de materiaux titaniferes
US5826162A (en) * 1994-03-08 1998-10-20 Rgc Mineral Sands Limited leaching of titaniferous materials
WO1995028503A1 (fr) * 1994-04-15 1995-10-26 Technological Resources Pty Ltd Traitement de liqueurs de lessivage pour la valorisation de materiaux titaniferes.
WO1995028502A1 (fr) * 1994-04-15 1995-10-26 Technological Resources Pty. Ltd. Lessivage d'un materiau titanifere
US6627165B2 (en) * 1994-04-15 2003-09-30 Technological Resources Pty Ltd Process for upgrading a titaniferous material containing silica
US5885536A (en) * 1994-04-15 1999-03-23 Technological Resources Pty Ltd Process for alkaline leaching a titaniferous material
US5830420A (en) * 1995-11-21 1998-11-03 Qit-Fer Et Titane Inc. Method to upgrade titania slag and resulting product
AU710701B2 (en) * 1995-11-21 1999-09-30 Qit-Fer Et Titane Inc. Method to upgrade titania slag and resulting product
US6531110B1 (en) 1995-11-21 2003-03-11 Qit-Fer Et Titane Inc. TiO2 containing product including rutile, pseudo-brookite and ilmenite
WO1997019199A1 (fr) * 1995-11-21 1997-05-29 Qit-Fer Et Titane Inc. Procede d'enrichissement des scories d'oxyde de titane et produit obtenu
US5679131A (en) * 1996-03-13 1997-10-21 Photran Corporation Method for producing titanium oxide from ore concentrates
EP0900855A1 (fr) * 1997-08-11 1999-03-10 Billiton SA Limited Production de scorie de titane
AU735491B2 (en) * 1997-08-11 2001-07-12 Billiton S.A. Limited Production of titanium slag

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US20030129113A1 (en) 2003-07-10
JPH08500393A (ja) 1996-01-16
MY109520A (en) 1997-02-28
CN1084223A (zh) 1994-03-23
EP0658214A4 (fr) 1996-07-03
US20020104406A1 (en) 2002-08-08
IN190922B (fr) 2003-09-06
CN1043154C (zh) 1999-04-28
EP0658214A1 (fr) 1995-06-21

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