Phase transformations during heating of llmenite concentrates

  title={Phase transformations during heating of llmenite concentrates},
  author={Suresh Kumar Gupta and V. Rajakumar and Paul Grieveson},
  journal={Metallurgical Transactions B},
Abstractllmenite concentrates were heated in argon and oxygen in the temperature range 700 °C to 1000 °C to study the behavior of the pseudorutile phase and other changes which occur. Pseudorutile does not persist in argon or oxygen in the temperature range studied. In argon at 700 °C, pseudorutile decomposes into hematite and rutile, while at 1000 °C, it combines with ilmenite to form ferrous-ferritic pseudobrookite solid solution. A new phase “Fe2O3-2TiO2” was identified as an intermediate… 

Phase Transitions and Reaction Mechanism of Ilmenite Oxidation

The oxidation of ilmenite ore is used in titanium processing. The effects of oxidation conditions, namely, temperature, ilmenite particle size, and oxygen pressure, on the product phase were

Kinetics and reaction mechanism of isothermal oxidation of Iranian ilmenite concentrate powder

Thermal oxidation of commercial ilmenite concentrate from Kahnouj titanium mines, Iran, at 500–950 °C was investigated for the first time. Fractional conversion was calculated from mass change of the

Formation of pseudobrookite through gaseous chlorides and by solid-state reaction

Pseudobrookite (Fe2TiO5) was prepared from Fe2O3–TiO2 mixtures at 850 and 950 °C in air, argon and chlorine atmospheres. In the latter case, an experimental arrangement in which Fe2O3 and TiO2 were

Studies on the Role of Heating in the Preparation of Rutile Substitute from Oscom Ilmenite

Beneficiation of ilmenite through structural alteration produced by thermal treatment followed by acid leaching has been attempted. The paper discusses the changes in the structure of ilmenite when

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The oxidation behaviors of South Africa (SA) titanomagnetite (TTM) and its effects on the gas solid reduction in the fluidized bed were investigated on the basis of the two-stage short process of

Preoxidation and hydrogen reduction of ilmenite in a fiuidized bed reactor

Studies on preoxidation and hydrogen reduction of Quilon-grade ilmenite have been carried out in a fluidized bed reactor. During preoxidation, the effect of various parameters such as temperature,



The Role of Preheating in the Kinetics of Reduction of Ilmenite with Carbon

AbstractAn ilmenite concentrate was heat treated in argon for 1, 2.5, 5 and 10 hours at 1000°C. The heat-treated samples were reduced with coal isothermally at 1000 and 1050°C and the reduction paths

Pseudorutile—a New Mineral Intermediate between Ilmenite and Rutile in the N Alteration of Ilmenite

ALTERATION of the mineral ilmenite, FeO·TiO2 in nature involves the processes of oxidation and leaching whereby iron is progressively removed to give a residual product, essentially TiO2. Several

The influence of weathering on the reduction of llmenite with carbon

The reduction of synthetic ilmenite and three ilmenite concentrates (Westralian Sands Limited (WSL), Western Mineral Sands (WMS) and Florida) with coal at 1000 ‡C to 1100 ‡C was stud-ied using

The alteration of ilmenite

"The oxidation of ilmenite in air at high temperatures (850 degrees C) yields a mixture of hematite, pseudobrookite, and rutile in an approximate molar ratio of 1:5:7. This product is almost

Alteration of ilmenite

Ilmenite and its alteration products in commercial heavy-mineral concentrates were studied by means of chemical analysis, optical microscopy, electron microscopy, electron microprobe, and X-ray

Oxidation Changes in Natural Ilmenite

NAGATA has discussed the occurrence of three magnetic components of the Haruna and Asio rocks exhibiting thermo-remanent reversals1. The properties of the B-component appear to be very similar to

The structure of pseudorutile and its role in the natural alteration of ilmenite

Samples of pseudoruti le from South Australian and Indonesian localit ies have been analyzed chemically and studied by X-ray diffraction techniques. A complete structure analysis has been carried out

Crichtonite, a distinct species

Summary Confusion over the status of crichtonite is due to the fact that de Bournon included two different minerals in his species: thin hexagonal plates are indeed ilmenite, as has been generally