Hydrometallurgical criteria for TiO2 leaching from Rosetta ilmenite by hydrochloric acid

El-Hazek, N.; Lasheen, T.A.; El-Sheikh, Ragaa; Zaki, Salah A.

doi:10.1016/j.hydromet.2007.01.003

Cited by 82 publications

(52 citation statements)

References 5 publications

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“….... (1) ... (2) .... (3) ... (4) ..... (5) Therefore, the standard Gibbs free energy change (ΔG°) of the above reactions can be calculated according to Eq. (6).…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…Since the Ti-bearing slags are produced from various raw ores by using different treating processes, the main chemical compositions and the phase structure of these slags are basically different. Therefore, how to extract titanium efficiently from the Ti-bearing slags has been attracted much attention, and various approaches have been utilized including acid process, [1][2][3] alkali fusion process, 4,5) carbonization and chlorination process, 6) selective crystallization process. [7][8][9][10][11] Comparing these methods, the alkali fusion process shows obvious advantage such as unrestricted raw slag materials, and easy recycling of alkali, etc.…”

Section: Introductionmentioning

confidence: 99%

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Selective Phase Transformation Behavior of Titanium-bearing Electric Furnace Molten Slag during the Molten NaOH Treatment Process

Zhang

et al. 2015

ISIJ Int.

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In this paper, selective phase transformation for titanium-bearing phase (Ti-bearing phase) and impurity phase in titanium-bearing electric arc furnace molten slag (Ti-bearing EAF slag) was effectively realized during the molten NaOH treatment process. The phase transformation mechanism based on thermodynamic calculation was investigated in detail by X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectrum. It is indicated that the Ti-bearing phases in Ti-bearing EAF slag such as anosovite solid solution and Mg2TiO4 can be easily converted to Na2TiO3 with NaCl-type crystal structure, whilst the main impurity phase such as MgAl2O4 was apt to be decomposed by molten NaOH to form NaAlO2 and MgO. In addition, with increasing of roasting temperature and time, as well as decreasing of Ti-bearing EAF slag/ NaOH mass ratio (Rslag/NaOH), the formed Na2TiO3 could be partly changed to NaMO2 (M=Mg, Ti, Fe) with α-NaFeO2-type crystal structure, due to the coexisting metal ions like Mg 2+ and Fe 3+ in the slag be doped into or even substituted the Ti atoms of Na2TiO3 to form NaMO2 (M=Ti, Fe, Mg).

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“….... (1) ... (2) .... (3) ... (4) ..... (5) Therefore, the standard Gibbs free energy change (ΔG°) of the above reactions can be calculated according to Eq. (6).…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selective Phase Transformation Behavior of Titanium-bearing Electric Furnace Molten Slag during the Molten NaOH Treatment Process

Zhang

et al. 2015

ISIJ Int.

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“…The construction and maintenance of coal sludge disposal sites also increase the production cost of coal preparation plants. Even more problematic, coal sludge contain high content of chemical reagents after flotation process, the release of chemical reagents, such as alkaline oxides, from these storage sites could cause serious environmental pollution in soil and water [3,4]. Therefore, the treatment and disposal of coal sludge is becoming an urgent problem on a global scale.…”

Section: Introductionmentioning

confidence: 99%

Utilization of coal sludge as reductant in the direct reduction of titanomagnetite ore

Geng¹,

Sun²,

Yang³

2016

Proceedings of the 2016 5th International Conference on Energy and Environmental Protection (ICEEP 2016)

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a gengchao1988@yeah.net Keywords: coal sludge; direct reduction; titanomagnetite; desulfurization Abstract: Coal-based direct reduction followed by magnetic separation was used to produce direct reduction iron powder (DRIP) from a titanomagnetite (TTM) ore. The residual solid wastes which are called coal sludge in this paper are still discarded as waste in large quantities. To explore the feasibility of using coal sludge as reductant, two types of coal sludge, namely, TJ and SX, with different dosages were investigated. Results showed that this process can realize coal-sludge utilization, and good DRIP products were obtained. The suitable dosage of coal sludge depended on the fixed carbon content of coal sludge. TJ and SX presented a similar result in reducing the TTM ore, i.e., TTM ore was reduced to iron, ilmenite, and ferrous pseudobrookite by both TJ and SX; improved Fe recovery in DRIP was further achieved by increasing the dosages of the two coal sludge, but the increased dosage was unfavorable to Fe grade and TiO 2 content. The sulfur contained in coal sludge occurred in the form of troilite in the reduced ore. Because troilite is a nonmagnetic material, it was removed into tailings after magnetic separation. Thus, the process presented a good ability of desulfurization.

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“…Reduction behaviour of titanomagnetite ore attracts attention from the viewpoint of its commercial processing and is extremely interesting from the viewpoint of the effect of the ore chemistry and morphology on reduction mechanisms and kinetics [2]. In the past decades, a number of studies have been conducted to improve the utilization of titaniferous ores, including smelting [3], direct acid leaching [4], selective chlorination [5] and reduction [6]. Among these, the direct reduced iron (DRI) process is supposed to be a more practical and effective way.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Direct Reduction Titanomagnetite Briquette Produced from Rossetta-Ilmenite via Hydrogen

El-Hussiny¹,

El-Amir²,

Abdel-Rahim³

et al. 2014

OALib

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Reduction kinetics of titanomagnetite concentrate briquettes produced from Rossetta-llmenite ore via 1.5 liter/min hydrogen flow rate were investigated at different temperatures ranging from 600˚C to 950˚C. It was found that the best reduction properties were found at 950˚C, so the kinetic models shown by the briquettes at this temperature maybe: Diffusion control or Diffusion through ash layer (crank-cinslling-Broushten equation). And the apparent activation energy calculated for these models was 33.223 and 30.389 kJ/mole respectively. Also the main crystalline phases of reduced briquettes at 950˚C were metallic iron (syn. Fe), rutile (syn. TiO2) and some traces of magnetite (Fe3O4).

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Hydrometallurgical criteria for TiO2 leaching from Rosetta ilmenite by hydrochloric acid

Cited by 82 publications

References 5 publications

Selective Phase Transformation Behavior of Titanium-bearing Electric Furnace Molten Slag during the Molten NaOH Treatment Process

Selective Phase Transformation Behavior of Titanium-bearing Electric Furnace Molten Slag during the Molten NaOH Treatment Process

Utilization of coal sludge as reductant in the direct reduction of titanomagnetite ore

Kinetics of Direct Reduction Titanomagnetite Briquette Produced from Rossetta-Ilmenite via Hydrogen

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