EP0719346A1 - Ilmenite processing using cold milling - Google Patents

Ilmenite processing using cold milling

Info

Publication number
EP0719346A1
EP0719346A1 EP94927454A EP94927454A EP0719346A1 EP 0719346 A1 EP0719346 A1 EP 0719346A1 EP 94927454 A EP94927454 A EP 94927454A EP 94927454 A EP94927454 A EP 94927454A EP 0719346 A1 EP0719346 A1 EP 0719346A1
Authority
EP
European Patent Office
Prior art keywords
dimethyl ammonium
ilmenite
milling
additive
titaniferous
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Withdrawn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
EP94927454A
Other languages
German (de)
French (fr)
Other versions
EP0719346A4 (en
Inventor
Andrzej Calka
Patrice Millet
Barry William Ninham
James Stanislaus Williams
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.)
WESTRALIAN SANDS Ltd
Australian National University
Original Assignee
WESTRALIAN SANDS Ltd
Australian National University
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 WESTRALIAN SANDS Ltd, Australian National University filed Critical WESTRALIAN SANDS Ltd
Publication of EP0719346A1 publication Critical patent/EP0719346A1/en
Publication of EP0719346A4 publication Critical patent/EP0719346A4/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C22B34/1236—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 titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching
    • C22B34/124—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 titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors
    • C22B34/1245—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 titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching using acidic solutions or liquors containing a halogen ion as active agent
    • 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
    • C22B34/1236—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 titanium or titanium compounds from ores or scrap by wet processes, e.g. by leaching

Definitions

  • the "Becher” process is also used to upgrade ilmenite - to remove iron and provide a feedstock for the "chloride route".
  • ilmenite is reacted with coal and sulphur in an iron reduction kiln at 1100°C. This reaction reduces the iron in the ilmenite to the metallic form.
  • the iron is rusted out in slurry form with ammonium chloride acting as a catalyst for the rusting.
  • the remaining iron compounds are removed by leaching with sulphuric acid.
  • the Murso process uses an oxidation of the ilmenite to convert substantially all the iron to the ferric state, then reduction of the oxidised material to convert substantially all the ferric iron to the ferrous state. These steps, of oxidation of the ilmenite followed by its reduction, produce a material which has an enhanced reactivity, from which the iron can be leached with dilute hydrochloric acid.
  • the prime object of the present invention is to provide a method of treating ilmenite and other titaniferous minerals to convert such minerals into a form from which the iron content can be removed by a simple leaching process.
  • That new ball mill which is described in the specification of International patent application No PCT/AU90/00471 (WIPO Publication No WO 91/04810), enables controlled-energy milling of a charge to be effected.
  • the present inventors have now discovered that under certain milling conditions, ilmenite can be reduced while being converted into a nanostructural form, and that iron can be removed from this product (for example, using hydrochloric acid at a temperature of about 100 C C).
  • the basic requirements of the cold milling process are: (i) that high energy milling is carried out at room temperature for a sufficient time period (up to 300 hours) to produce a powder having a nanostructural form, and (ii) that the milling is effected in the presence of suitable additives to the ball mill charge.
  • the milling is carried out in a ball mill of the type described and claimed in the specification of International patent application No PCT/AU90/00471.
  • simple milling of ilmenite did not produce a reactive nanostructural form of the mineral.
  • milling ilmenite with an additive to the ball mill charge did yield a reactive nanostructural product.
  • the milled samples were then leached with no further treatment.
  • the composition of each sample was assessed using one or more of the following techniques: x-ray diffraction; Mossbauer spectroscopy; transmission and scanning electron microscopy; atomic absorption spectrometry; Rutherford backscattering spectrometry.
  • structural development of the as-milled samples was monitored by x-ray diffraction of cobalt K ⁇ radiation using a Phillips diffractometer, and Rutherford backscattering spectrometry was used to analyse the presence of iron in chemically leached samples.
  • the pH was adjusted to a value of 5, which corresponds to positively charged ilmenite particles, in order to get adsorption of the anionic surfactant SDDS.
  • Potassium hydroxide and potassium chloride were used for pH adjustment.
  • No adjustment of the pH of the aqueous solution was necessary for experiments with the additive DDAOH.
  • the nanostructural ilmenite products obtained by milling the ilmenite with the additives (i) DDAOH, (ii) SDDS and (iii) amorphous boron, were leached with 4M hydrochloric acid at temperatures ranging from 80°C to 100°C.
  • the Rutherford backscattering spectroscopy spectra of the leached materials showed

Landscapes

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

Abstract

High energy ball milling of particulate ilmenite (or other titaniferous ore) at room temperature, for periods of up to 300 hours, in the presence of a suitable additive, produces a nanostructural powder from which at least a major proportion of the iron in the titaniferous ore can be leached. The additive may be a reducing agent (for example, amorphous boron), a long chained hydrocarbon (for example, dodecane) or a surfactant (preferably dihexadecy1 dimethyl ammonium acetate, or didodecyl dimethyl ammonium bromide, or didodecyl dimethyl ammonium acetate, or didodecyl dimethyl ammonium hydroxide, or sodium didodecyl sulphate). The leaching is preferably effected using 4M hydrochloric acid at a temperature of from 80 °C to 100 °C.

Description

TITLE: "ILMENITE PROCESSING USING COLD MILLING"
Technical Field
This invention concerns the treatment of minerals containing titanium dioxide and iron, which are generally called titaniferous minerals. The most common of these minerals is ilmenite. More particularly, this invention concerns cold milling of particulate titaniferous minerals to form nanostructured products from which the iron content (or a significant amount of the iron content) of the mineral can be removed by a leaching process.
Background to the Invention
Ilmenite, FeTi03, and titaniferous minerals generally, are relatively inert minerals that have long been a major source of titanium dioxide, Ti02, which is used as a white pigment in paints, to produce welding rods, and in the cosmetic and ceramics industries. Extraction of the iron from the ilmenite and other titaniferous minerals has been, and still is, an expensive undertaking.
Most of the currently used metallurgical processing of ilmenite includes hot acid leaching of the particulate mineral, with associated environmental problems. For example, the "sulphate route" for the extraction of titanium dioxide from ilmenite involves the steps of
(a) mixing dry milled ilmenite with 85 to 92 per cent sulphuric acid;
(b) heating the mixture of ground ilmenite and sulphuric acid to a temperature of about 160°C, at which temperature an exothermic reaction is initiated, the product of this reaction being a mixture of ferrous, ferric and titanium sulphates;
(c) forming an aqueous (or weakly acid) solution of the mixture of sulphates, then reducing the ferric sulphate to ferrous sulphate with scrap iron;
(d) clarifying the solution by sedimentation;
(e) removing the iron in the solution by crystallisation (as FeS04.7H20); and
(f) extracting the titanium dioxide using hydrolysis.
Another technique that is used to process ilmenite is the so-called "chloride route", which involves the chlorination of impure rutile using gaseous chlorine at a temperature in the range of from 650°C to 1,150°C to form titanium tetrachloride (TiCl4). The TiCl4 is then oxidised to produce pure titanium dioxide.
The "Becher" process is also used to upgrade ilmenite - to remove iron and provide a feedstock for the "chloride route". In the Becher process, ilmenite is reacted with coal and sulphur in an iron reduction kiln at 1100°C. This reaction reduces the iron in the ilmenite to the metallic form. After cooling the products of the reaction, the iron is rusted out in slurry form with ammonium chloride acting as a catalyst for the rusting. The remaining iron compounds are removed by leaching with sulphuric acid.
One of the more promising alternative ilmenite processing methods, developed jointly by Commonwealth Scientific and Industrial Research Organisation and Murphyores Pty Limited, known as the "Murso process", is described in the specification of Australian patent No 416,143. The Murso process uses an oxidation of the ilmenite to convert substantially all the iron to the ferric state, then reduction of the oxidised material to convert substantially all the ferric iron to the ferrous state. These steps, of oxidation of the ilmenite followed by its reduction, produce a material which has an enhanced reactivity, from which the iron can be leached with dilute hydrochloric acid. The cost of using hydrogen as the reducing agent and the cost of regeneration of the hydrochloric acid used for leaching have made the adoption of the Murso process commercially unattractive. Several attempts have been made to modify the Murso process to improve its economics, but at the time of writing this specification, it has not been adopted commercially.
The search for other improved methods of producing rutile from ilmenite has continued.
Disclosure of the Present Invention
The prime object of the present invention is to provide a method of treating ilmenite and other titaniferous minerals to convert such minerals into a form from which the iron content can be removed by a simple leaching process.
This objective is achieved by a cold milling process.
Ball milling of ores, with and without additives to facilitate the comminution process (the reduction of particle size) is not new. The early potential of ball milling for the reduction and extraction of ores, however, has generally not been fulfilled, and interest in such ore processing technology has waned. The development of a new form of high energy ball mill at The Australian National University, and the success that has been achieved in mechanical alloying work with that ball mill (see, for example, the specifications of International Patent Applications Nos PCT/AU91/00248, PCT/AU92/00073 and PCT/AU94/00057), have stimulated new interest in the cold milling of ores. That new ball mill, which is described in the specification of International patent application No PCT/AU90/00471 (WIPO Publication No WO 91/04810), enables controlled-energy milling of a charge to be effected. The present inventors have now discovered that under certain milling conditions, ilmenite can be reduced while being converted into a nanostructural form, and that iron can be removed from this product (for example, using hydrochloric acid at a temperature of about 100CC).
The basic requirements of the cold milling process are: (i) that high energy milling is carried out at room temperature for a sufficient time period (up to 300 hours) to produce a powder having a nanostructural form, and (ii) that the milling is effected in the presence of suitable additives to the ball mill charge.
Thus, according to the present invention, there is provided a method of treatment of a titaniferous ore to facilitate the removal of iron from the ore to produce rutile, the method comprising high energy milling of the ore in particulate form in the presence of a suitable additive for a period sufficient to form a nanostructural titaniferous product. The additives include both solid and liquid reducing agents. Amorphous boron has been found to be a useful additive, as have a range of surfactants and organic materials (particularly long chained hydrocarbons). Among the surfactants which may constitute the additive of the present invention are:
(a) dihexadecyl dimethyl ammonium acetate (DHDAA);
(b) didodecyl dimethyl ammonium bromide (DDAB);
(c) didodecyl dimethyl ammonium acetate (DDAA); (d) didodecyl dimethyl ammonium hydroxide (DDAOH); and
(e) sodium didodecyl sulphate (SDDS) - an anionic double chained surfactant.
Dodecane is a preferred long chained hydrocarbon which can be used as the additive of this invention.
To extend this method to include the production of rutile, the milled ore must subsequently be leached to extract the iron from it (for example, using hydrochloric acid at a temperature of about 100°C).
Preferably the milling is carried out in a ball mill of the type described and claimed in the specification of International patent application No PCT/AU90/00471.
A better understanding of the present invention will be obtained from the following description and discussion of experimental work in connection with the cold milling of ilmenite, which has been undertaken by the present inventors. Description of Cold Milling Work
The present inventors hypothesised that subjecting a particulate titaniferous material to prolonged milling should change the mineral into a reactive nanostructural form, from which it should be possible to remove α-Fe by acid leaching or by magnetic separation. When this hypothesis was tested, simple milling of ilmenite did not produce a reactive nanostructural form of the mineral. However, milling ilmenite with an additive to the ball mill charge, surprisingly, did yield a reactive nanostructural product.
A series of experiments were then performed with ilmenite (in its mineral sand form) to investigate this phenomenon further. In each experiment, the particulate ilmenite was subjected to prolonged high-energy milling in a ball mill of the type described in the specification of International patent application No PCT/AU90/00471. (It will be appreciated that milling in other types of high energy ball mill for an appropriate period of time should have the same effect. ) The milling was effected for a period sufficient to convert the particulate ilmenite charge of the ball mill into a nanostructural material. This required high energy ball milling for a period of time which depended upon the milling conditions and the additive(s) to the ball mill charge.
The milled samples were then leached with no further treatment. At different stages of the experiments, the composition of each sample was assessed using one or more of the following techniques: x-ray diffraction; Mossbauer spectroscopy; transmission and scanning electron microscopy; atomic absorption spectrometry; Rutherford backscattering spectrometry. In particular, structural development of the as-milled samples was monitored by x-ray diffraction of cobalt Kα radiation using a Phillips diffractometer, and Rutherford backscattering spectrometry was used to analyse the presence of iron in chemically leached samples.
A range of additives were used with the initial charge of the ball mill. In each experiment, the additive remained in the charge of the ball mill for the duration of the milling. Although there was some variation of the concentration of some of the additives, no attempt was made to optimise their concentrations or their reducing properties. One control experiment was carried out using ilmenite alone (that is, with no additive to the charge of the ball mill).
Particular additives used in the experiments were as follows:
1. DDAA ( idodecyl dimethyl ammonium acetate);
2. DDAB (didodecyl dimethyl ammonium bromide);
3. DHDAA (dihexadecyl dimethyl ammonium acetate); 4. DDAOH (didodecyl dimethyl ammonium hydroxide);
5. SDDS (sodium didodecyl sulphate);
6. Dodecane; and
7. Amorphous boron. During the milling - which lasted for up to 300 hours - the charge of the ball mill was held at room temperature (about 25°C). For experiments using the additives 1 to 5 above, the milling was performed in aqueous solution. Considering the point of zero charge of the ilmenite particle, it was necessary to adjust the pH of the aqueous solution of the additives DDAA, DDAB and DHDAA so that it had a value of 10, which corresponds to negatively charged ilmenite particles, in order to get adsorption of the cationic species. For the experiments with the additive SDDS, the pH was adjusted to a value of 5, which corresponds to positively charged ilmenite particles, in order to get adsorption of the anionic surfactant SDDS. Potassium hydroxide and potassium chloride were used for pH adjustment. No adjustment of the pH of the aqueous solution was necessary for experiments with the additive DDAOH.
The nanostructural ilmenite products obtained by milling the ilmenite with the additives (i) DDAOH, (ii) SDDS and (iii) amorphous boron, were leached with 4M hydrochloric acid at temperatures ranging from 80°C to 100°C. The Rutherford backscattering spectroscopy spectra of the leached materials showed
(a) that less than 5 atomic per cent of the iron in the sample milled with DDAOH remained after leaching; and
(b) there had been a significant reduction of the iron content of the ilmenite samples that had been milled with SDDS and with amorphous boron. The x-ray diffraction pattern of the material milled with DDAOH and then leached with hydrochloric acid showed only peaks corresponding to rutile.
Thus the experiments showed that prolonged milling of ilmenite with an appropriate additive produces a nanostructural powder that is amenable to leaching with hot hydrochloric acid to remove the iron component of the ilmenite and leave rutile (Ti02).

Claims

1. A method of treatment of a titaniferous ore to facilitate the removal of iron from the ore to produce rutile, the method comprising high energy milling of the ore in particulate form in the presence of a suitable additive for a period sufficient to form a nanostructural titaniferous product.
2. A method as defined in claim 1, in which said additive is a reducing agent.
3. A method as defined in claim 2, in which said reducing agent is amorphous boron.
4. A method as defined in claim 1, in which said additive is a long chained hydrocarbon.
5. A method as defined in claim 4, in which said hydrocarbon is dodecane.
6. A method as defined in claim 1, in which said additive is a surfactant.
7. A method as defined in claim 6, in which said surfactant is a surfactant selected from the group consisting of:
(a) dihexadecyl dimethyl ammonium acetate;
(b) didodecyl dimethyl ammonium bromide;
(c) didodecyl dimethyl ammonium acetate;
(d) didodecyl dimethyl ammonium hydroxide; and
(e) sodium didodecyl sulphate.
8. A method as defined in claim 6 or claim 7, in which said surfactant is in aqueous solution and the pH of the aqueous solution is adjusted to ensure adsorption of the surfactant by the titaniferous ore.
9. A method as defined in any preceding claim, in which the high energy milling is effected at a temperature of about 25°C.
10. A method as defined in any preceding claim, in which the high energy milling is effected for a period of about 300 hours.
11. A method as defined in any preceding claim in which the high energy milling is effected in a ball mill of the type described and claimed in the specification of International patent application No PCT/AU90/00471.
12. A -ethod as defined in any preceding claim, in which the titaniferous ore is ilmenite.
13. A method as defined in any preceding claim, including the additional step of leaching the nanostructural titaniferous product of the milling to remove at least a major proportion of the iron therein.
14. A method as defined in claim 13, in which said leaching is effected using hydrochloric acid.
15. A method as defined in claim 14, in which said leaching is effected using 4M hydrochloric acid at a temperature in the range of from 80°C to 100°C.
16. A method of treatment of a titaniferous ore as defined in claim 1, substantially as hereinbefore described.
EP94927454A 1993-09-13 1994-09-13 Ilmenite processing using cold milling Withdrawn EP0719346A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPM117793 1993-09-13
AUPM1177/93 1993-09-13
PCT/AU1994/000550 WO1995008004A1 (en) 1993-09-13 1994-09-13 Ilmenite processing using cold milling

Publications (2)

Publication Number Publication Date
EP0719346A1 true EP0719346A1 (en) 1996-07-03
EP0719346A4 EP0719346A4 (en) 1997-05-07

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Family Applications (1)

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EP94927454A Withdrawn EP0719346A4 (en) 1993-09-13 1994-09-13 Ilmenite processing using cold milling

Country Status (6)

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EP (1) EP0719346A4 (en)
JP (1) JPH09504829A (en)
CA (1) CA2169947A1 (en)
NZ (1) NZ273552A (en)
WO (1) WO1995008004A1 (en)
ZA (1) ZA947050B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10124523A1 (en) * 2001-05-19 2002-11-21 Deutsche Telekom Ag Method for presenting several electronically stored pages of a publication on an electronic display that allows a reader to have a feel for its thickness and allows leafing through in a manner analogous to a real publication

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996010653A1 (en) * 1994-10-04 1996-04-11 The Australian National University Treatment of minerals for extraction of zirconium
EP0854765B1 (en) 1995-08-28 2001-04-04 Advanced Nano Technologies Pty Ltd Process for the production of ultrafine particles
US6548039B1 (en) 1999-06-24 2003-04-15 Altair Nanomaterials Inc. Processing aqueous titanium solutions to titanium dioxide pigment
US6375923B1 (en) 1999-06-24 2002-04-23 Altair Nanomaterials Inc. Processing titaniferous ore to titanium dioxide pigment
US6440383B1 (en) 1999-06-24 2002-08-27 Altair Nanomaterials Inc. Processing aqueous titanium chloride solutions to ultrafine titanium dioxide
DE10249163A1 (en) * 2002-10-22 2004-05-06 Plath, Peter Jörg, Prof.Dr. Method and device for using Faraday instabilities to carry out tribochemical reactions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714857A (en) * 1951-08-30 1954-09-01 British Titan Products Improvements in or relating to the manufacture of titanium dioxide pigments from mineral rutile ores
DE3721509A1 (en) * 1987-06-30 1989-01-12 Kloeckner Humboldt Deutz Ag Process and apparatus for leaching metal-containing, non-predried raw materials
WO1991004810A1 (en) * 1989-10-03 1991-04-18 The Australian National University Ball milling apparatus and method, and production of metallic amorphous materials

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2351706A1 (en) * 1976-05-19 1977-12-16 Dow Chemical Co Grinding minerals or mining prods. - in liq. slurry contg. anionic poly:electrolyte (SW 12.12.77)
BR7800585A (en) * 1978-01-31 1979-08-21 Vale Do Rio Doce Co PROCESS OF OBTAINING MECHANICAL CONCENTRATES FROM ANATASIO
US4175952A (en) * 1978-07-19 1979-11-27 Uop Inc. Recovery of iron and titanium metal values
US4197276A (en) * 1978-07-31 1980-04-08 Uop Inc. Recovery of titanium metal values
US4175110A (en) * 1978-08-22 1979-11-20 Uop Inc. Recovery of titanium metal values

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB714857A (en) * 1951-08-30 1954-09-01 British Titan Products Improvements in or relating to the manufacture of titanium dioxide pigments from mineral rutile ores
DE3721509A1 (en) * 1987-06-30 1989-01-12 Kloeckner Humboldt Deutz Ag Process and apparatus for leaching metal-containing, non-predried raw materials
WO1991004810A1 (en) * 1989-10-03 1991-04-18 The Australian National University Ball milling apparatus and method, and production of metallic amorphous materials

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9508004A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10124523A1 (en) * 2001-05-19 2002-11-21 Deutsche Telekom Ag Method for presenting several electronically stored pages of a publication on an electronic display that allows a reader to have a feel for its thickness and allows leafing through in a manner analogous to a real publication

Also Published As

Publication number Publication date
ZA947050B (en) 1995-08-07
WO1995008004A1 (en) 1995-03-23
EP0719346A4 (en) 1997-05-07
NZ273552A (en) 1996-12-20
CA2169947A1 (en) 1995-03-23
JPH09504829A (en) 1997-05-13

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