reduced ilmenite oxidation

Effect of pre-oxidation on the carbothermic reduction of ...

The phase transitions of carbothermic reduction of pre-oxidation and original ilmenite concentrates are shown in Fig. 8. Compared with the original ilmenite concentrate, the carbothermic reduction of pre-oxidation ilmenite concentrate requires a longer reduction process and needs a larger amount of reductant (graphite).

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Ilmenite–CO reduction kinetics - ScienceDirect

We repeated the reduction–oxidation cycles three times at each concentration and temperature, for a total of 27 cycles, plus 15 initial cycles oxidized (21% O 2) and reduced under 15% H 2 for 5 min at 800 °C. These cycles stabilized ilmenite’s stone reactivity and the data were ignored in

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Ilmenite Reduction Redox Iron

Kazakhstan 865 . it is oxidized ilmenite and pre-reduced ilmenite. The syngas is fed into the shaft furnace as reducing gas. Figure 7: "Macro" model An industrial process model of ilmenite pre-reduction is proposed based on the MIDREX® Process for direct reduced iron in a shaft furnace.

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KINETICS OF REDOX REACTIONS OF ILMENITE FOR

The objective of this study was to establish the kinetic of both reduction and oxidation reactions taking place in the Chemical-Looping Combustion (CLC) process using ilmenite as oxygen carrier. Because of the beneficial of the use of pre-oxidized ilmenite and the activation of the ilmenite during the redox cycles, both the reactivity of pre-

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MODELING AND SIMULATION PRE-REDUCTION OF

reduces ilmenite using CO from partial combustion of coal in a rotary kiln. It has been shown that iron oxides in ilmenite are reduced more efficiently in H2 than in CO. By partial replacement of CO with H2 an increase in the reduction rate and possibly reduction at lower temperatures is expected

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Kinetics and mechanism of hydrogen reduction of ilmenite ...

In this paper, a novel process was studied for the recovery of iron and titanium from ilmenite concentrate. The ilmenite powders first underwent an oxidation pretreatment and were reduced ...

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Becher process - Wikipedia

The Becher Process is an industrial process used to upgrade ilmenite to synthetic rutile. The mineral , ilmenite, contains 55-65% titanium as TiO 2 , the rest being iron oxide . The Becher process removes the iron oxide, leaving a residue of synthetic rutile , which is more than 90% TiO 2 .

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History  Process

E ffects of mechanical activation and oxidation­ reduction

In the present work, the oxidation and reduction of Panxi ilmenite concentration were investigated, and the effects of mechanical activation on hydrochloric acid leaching b ehavior of untreated ilmenite concentration and oxidized­ reduced ilmenite concentration were also investigated.

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Effects of Pre-oxidation and Additive on Carbothermic ...

pre-oxidation and additives on carbothermic reduction of ilmenite concentrate. The isothermal reduction behavior of pre-oxidation ilmenite concentrate with graphite and sodium sulphate additive was investigated in this work. Experimental Materials The ilmenite concentrate used in this investigation was supplied by Panzhihua Iron and Steel Group.

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Effects of H2S on the Reactivity of Ilmenite Ore as ...

Dec 06, 2018  The results showed that the reactivity of the ilmenite oxygen carrier improved with the presence of H 2 S, for both the reduction and the oxidation steps. Scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses were conducted to assess sulfur deposition on the reduced ilmenite samples.

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Ilmenite Reduction Studies Using charcoal and

reduction of titanium from +4 oxidation state to +3 oxidation state occurs above 1000°C with reduced atmosphere. Hence, 900°C is taken as the optimum condition for the reduction studies. 3.3. Reduction Efficiency with 20Time The reduction efficiency of ilmenite with varying the reduction time (5 min-30 min) is given in Table 7.

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Kinetics of the Oxidation and Reduction of Synthetic Ilmenite

The kinetics of the oxidation and reduction of synthetic ilmenite was studied thermogravimetrically in the light of kinetic theory for heterogeneous noncatalytic reactions.

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Becher process - Wikipedia

The Becher Process is an industrial process used to upgrade ilmenite to synthetic rutile. The mineral , ilmenite, contains 55-65% titanium as TiO 2 , the rest being iron oxide . The Becher process removes the iron oxide, leaving a residue of synthetic rutile , which is more than 90% TiO 2 .

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Leaching of ilmenite and pre-oxidized ilmenite to

ilmenite oxidation. Pre-oxidation of ilmenite produce surface modifications as a result of diffusional processes that take place at high temperature on air. In this particular case, iron moves faster than titanium and they tend to migrate towards the high oxygen potential region (Martin, M. 2003).

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An electrochemical study of reduced ilmenite carbon

The anodic dissolution of reduced ilmenite has been studied using the carbon paste electrode tech- nique. To understand the polarization behaviour of reduced ilmenite, the polarization behaviour of iron oxide and iron powder carbon paste electrodes has also been investigated. It was shown that

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IRON REMOVING FROM TITANIUM SLAG FOR

(3) Reduction of the iron content of the ilmenite to the metallic iron followed by corrosion with oxygen and ammonium chloride. (4) Oxidation and reduction of ilmenite followed by hydrochloric acid leaching (MURSO process). (5) Roasting and magnetic separation

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Published in: Physicochemical Problems of Mineral Processing 2012Authors: Akbar Mehdilo Mehdi IrannajadAffiliation: Amirkabir University of TechnologyAbout: Leaching Chloride process

Ilmenite Activation during Consecutive Redox Cycles in ...

Ilmenite, a natural mineral composed of FeTiO3, is a low-cost and promising oxygen carrier (OC) for solid fuels combustion in a chemical-looping combustion (CLC) system. The aim of this study is to analyze the behavior of ilmenite as an OC in CLC and the changes in its properties through redox cycles. Experiments consisting of reduction−oxidation cycles in a thermogravimetric analyzer were ...

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Published in: Energy Fuels 2010Authors: Juan Adanez Ana Cuadrat Alberto Abad Pilar Gayan Luis F De Diego FranciscAbout: Input/output Scanning electron microscope Gas pycnometer Solid fuel Ilmenite

Kinetics of leaching of oxidized and reduced ilmenite in ...

This was followed by leaching in 5% to 15% hydrochloric acid solution in temperature range of 30 to 75 °C for periods of up to 2 h. The results were compared with those obtained by leaching of ilmenite reduced without oxidizing. Oxidation prior to reduction of the ilmenite was found to increase both the extent and the rate of leaching.

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Published in: International Journal of Mineral Processing 2006Authors: M K Sarker A K M B Rashid A S W KurnyAffiliation: Bangladesh University of Engineering and TechnologyAbout: Kinetics Activation energy Ilmenite Leaching

Influence of Pre-oxidation on Carbothermic Reduction ...

The pre-oxidation of Panzhihua ilmenite concentrate was investigated at 1073 K and 1273 K under air atmosphere. The products of the pre-oxidation at 1073 K were Fe 2 O 3, TiO 2 and Fe 2 Ti 3 O 9, while Fe 2 O 3, TiO 2 and Fe 2 TiO 5 at 1273 K. The influences of pre-oxidation on the carbothermic reduction were studied at 1473 K, 1573 K, 1673 K and 1773 K under argon atmosphere.

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NASA Technical Reports Server (NTRS) - Mechanisms of ...

Jan 01, 1991  X ray diffraction and energy dispersive spectroscopy were utilized to follow the progression of ilmenite oxidation at 1123 and 1140 K and the reduction of pseudobrookite (Fe2TiO5) at 873 and 973 K. Structures formed during the progress of oxidation were related to the system's phase diagrams.

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Reduction of Ilmenite With Hydrogen Titanium Titanium ...

Reduction of Ilmenite with Hydrogen Y. Zhao and F. Shadman* Department of stone Engineering, University of Arizona, Tucson, Arizona 85721 The kinetics and the mechanism of reduction of synthetic ilmenite by hydrogen in the temperature range of 807-1014 "C were investigated. At temperatures below 876 "C, the temporal profiles of

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Microwave reduction of oxidised ilmenite concentrates ...

Microwave reduction of oxidised ilmenite concentrates Kelly, R.M.; Rowson, N.A. 1995-11-01 00:00:00 This stone covers preliminary investigations into the novel use of microwave energy as a heat source for the partial reduction of oxidised ilmenite (FeTiO 3 ) concentrates. Microwave energy has potential for the speedy and efficient heating of ...

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Published in: Minerals Engineering 1995Authors: R M Kelly N A RowsonAffiliation: University of BirminghamAbout: Titanium Specific surface area Titanium oxide Titanium dioxide Scanning electron

Ilmenite - Wikipedia

Ilmenite, also known as manaccanite, is a titanium-iron oxide mineral with the idealized formula FeTiO 3.It is a weakly magnetic black or steel-gray solid. From a commercial perspective, ilmenite is the most important ore of titanium. Ilmenite is the main source of titanium dioxide, which is used in paints, printing inks, fabrics, plastics, paper, sunscreen, stone and cosmetics.

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Structure and properties  Discovery  Mineral chemistry  Paragenesis

Studies on the upgrading of Indian ilmenites to synthetic ...

reduction of ilmenite is possible with coke at 800°e. Shomate et al. 7 carried out a thermodynami c study of reduction of ilmenite by carbon, carbon monoxide and hydrogen. Yijay et ai.8 studied pre-oxidation and hydrogen reduction of ilmenite in a fluidized bed reactor. In a kinetic study on the reduction of ilmenite

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Studies on the upgrading of Indian ilmenites to synthetic ...

reduction of ilmenite is possible with coke at 800°e. Shomate et al. 7 carried out a thermodynami c study of reduction of ilmenite by carbon, carbon monoxide and hydrogen. Yijay et ai.8 studied pre-oxidation and hydrogen reduction of ilmenite in a fluidized bed reactor. In a kinetic study on the reduction of ilmenite

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Reactivity Investigation on Iron-Titanium Oxides for a ...

Once the mineral is reduced, rutile is formed and ap-pears outside of the iron-containing phases. During the oxidation of the reduced mineral, the original ilmenite structure. The industrial feasibility of CLC process for gas fuels has been successfully tested in fluidized reactor units ranging from 300 W - 500 kW using natural gas or syn-

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A STRUCTURAL MODEL FOR THE RUSTING OF

Acta Metallurgica Slovaca, 9, 2003, 1 (13 - 20 ) 14 the rusting step the reduced ilmenite is subjected to oxidation by suspending it in NH4Cl solution followed by aeration when the iron oxide comes out, which can be separated.

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Kinetics of gaseous reduction of ilmenite - Jones - 1975 ...

Doki Yamaguchi, Liangguang Tang and Ken Chiang, Pre-oxidation of natural ilmenite for use as an oxygen carrier in the cyclic methane–steam redox process for hydrogen production, stone Engineering Journal, 322, (632), (2017).

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Oxidation of Indian Ilmenite: Thermodynamics and

1989). The pre oxidation of ilmenite improves the reduction reaction of ilmenite and also helps disproportionation of iron oxide from TiO2 lattice. Various impurities and gangue minerals present the ilmenite concentrate also influence the oxidation reaction. Therefore, thermodynamics aspects of the

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Titanium Dioxide Recovery from Ilmenite Contained in ...

TiO2, and the highest oxidation of ilmenite (82%) was achieved at 1, 000 °C for 1 h. The carbothermic reduction with 15wt% carbon at The carbothermic reduction with 15wt% carbon at 950 °C for 2 h achieved a content of 6% TiO 2 and 21% ilmenite.

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Kinetics of redox reactions of ilmenite for stone ...

The objective of this study was to establish the kinetic of both reduction and oxidation reactions taking place in the chemical-looping combustion (CLC) process using ilmenite as an oxygen carrier. Because of the benefits of using of pre-oxidized

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Ilmenite Activation during Consecutive Redox Cycles

18 at 1223 K ilmenite have been used as initial OCs. Fresh ilmenite reacts slowly; nevertheless there is a 19 gain in reactivity in reduction as well as in oxidation with the number of cycles. This activation occurs 20 for all tested fuel gases and is faster if ilmenite has

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Published in: Energy Fuels 2010Authors: Juan Adanez Ana Cuadrat Alberto Abad Pilar Gayan Luis F De Diego FranciscAbout: Input/output Scanning electron microscope Gas pycnometer Solid fuel Ilmenite

Process activated ilmenite as catalyst for cleaning of ...

The oxidized ilmenite is subsequently reduced, resulting in reduced iron oxide and iron metal which will act as catalysts for light hydrocarbons/tar reforming as well as water-gas shift reaction in the high steam content environment.

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Oxidation and Reduction of Iron-Titanium Oxides in ...

Abstract — Oxidation and Reduction of Iron-Titanium Oxides in stone Looping Combustion: A Phase-Chemical Description— Ilmenite (FeTiO 3) is being explored as an oxygen carrier in stone looping processes. Its reduction and oxidation are described by the system Fe

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High Temperature Interaction Between H 2 O and ...

The interaction between water and reduced ilmenite samples as produced in a hydrothermal reduction process has been investigated at temperature of 1070 and 1223 K utilizing a Ugine‐Setaram Thermobalance coupled with a mass‐spectrometer. The experimental data show that the process of oxidation of reduced ilmenite is feasible at high temperature giving rise to the formation of FeO and

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An Electrochemical Study of the Reduction and

Please cite this article as: Zhang, Suchun, Nicol, Michael J., An Electrochemical Study of the Reduction and Dissolution of Ilmenite in Sulfuric Acid Solutions,Hydrometallurgy (2009), doi: 10.1016/j.hydromet.2009.02.009 This is a PDF file of an unedited manuscript that

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High Temperature Interaction Between H2O and

The experimental data show that the process of oxidation of reduced ilmenite is feasible at high temperature giving rise to the formation of FeO and Fe 2 O 3 at different stages of oxidation. The process occurs according to the reactions: Fe(s), ...

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Kinetics and mechanism of ilmenite reduction with carbon ...

Wei Lv, Xuewei Lv, Junyi Xiang, Jinsheng Wang, Xueming Lv, Chenguang Bai and Bing Song, Effect of pre-oxidation on the carbothermic reduction of ilmenite concentrate powder, International Journal of Mineral Processing, 169, (176), (2017).

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Published in: Aiche Journal 1990Authors: Y Zhao Farhang ShadmanAffiliation: University of ArizonaAbout: Kinetics Carbon monoxide Ilmenite Reaction mechanism