Effect of Processing Parameters on Aeration of Reduced Hatinh Ilmenite

Nguyen, Thao Thi; Truong, Than Ngoc; Dang, Khanh Quoc; Duong, Binh Ngoc

doi:10.4028/www.scientific.net/kem.682.314

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…In the aeration of reduced ilmenite, the formation of these complexes (reaction 1,5-8) limited the precipitation of a passive layer on the ilmenite particle surface, the complexes break apart upon entering bulk solution and iron precipitates out as iron oxyhydroxyl [5][6]16]. The acetate and citrate anions acted as a transporter in the movement of corroded iron from reduced ilmenite into bulk solution.…”

Section: Methodsmentioning

confidence: 99%

Impact of Organic Acid Addition on the Formation of Precipitated Iron Compounds

Nguyen¹,

Truong²,

Duong³

2016

Acta Metall Slovaca

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In this work, acetic and citric acids were used along with ammonium chloride in the removal of iron from reduced Hatinh ilmenite. Iron removal was carried out at 70ºC, 4 liter/min of air flow rate, 7/1 of liquid/solid ratio and 0.5% NH4Cl as catalyst. After 9 hours, metallic iron was decreased from 30.3% in reduced ilmenite to 0.5% in synthetic rutile. The addition of 0.4% acetic acid into NH4Cl solution reduces removal time to 5 hours, residual metallic iron (RMI) was also 0.5%. The addition of 0.4% citric acid also reduces removal time to 5 hours, RMI was reduced to 0.33%. The rusting rate of metallic iron increased when acid concentration increased from 0.1 to 1%. The results indicated that acetic and citric acids could be used as additional catalysts along with NH4Cl in the removal of metallic iron in reduced ilmenite. The acid have the capability to form complexes with iron and also showed impact on the formation of precipitated iron compounds.

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Section: Methodsmentioning

confidence: 99%

Impact of Organic Acid Addition on the Formation of Precipitated Iron Compounds

Nguyen¹,

Truong²,

Duong³

2016

Acta Metall Slovaca

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“…Previous experimental works using ammonium chloride as a catalyst had found a concentration of 0.1 M to be the optimum required to leach a reduced ilmenite slurry [15]. In this series of experiments, acetic acid and sodium acetate were used independently and together as a replacement for the ammonium chloride catalyst.…”

Section: Results and Discussion 31 Effects Of Catalyst On Aerationmentioning

confidence: 99%

“…Reduced ilmenite was prepared following the experimental procedure described in previous work [10,15], the compositions were given in Table 1. In a typical aeration experiment, 40g of reduced ilmenite were added to 280 ml of the reaction solution.…”

Section: Methodsmentioning

confidence: 99%

“…Temperature of the ammonium chloride slurry had a significant effect on the rate of iron leaching [15] so the effect of temperature changes on aeration with the AASA mixture catalyst was investigated. The slurries used for this series of experiments consisted of 40 g of reduced ilmenite, 280 ml of AASAM solution contain 0.075M CH3COOH and 0.025 M CH3COONa.…”

Section: Effect Of Aeration Temperaturementioning

confidence: 99%

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Acetic Acid and Sodium Acetate Mixture as an Aeration Catalyst in the Removal of Metallic Iron in Reduced Ilmenite

Truong¹,

Nguyen²,

Duong³

2017

Acta Metall Slovaca

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Acetic acid and sodium acetate mixture (AASAM) was used as an aeration catalyst in the removal of metallic iron in reduced ilmenite. The efficiency of the catalyst was then compared to the standard ammonium chloride catalyst used in industry. Obtained results show that faster rate of iron removal could be achieved with AASAM while the molar concentrations of both AASAM and ammonium chloride were 0.1M. The highest rate of iron removal was achieved at the mixture proportion of 0.025M CH3COONa and 0.075M CH3COOH, aeration parameters of 70 °C, solid/liquid ratio of 1/7 and air flow rate of 4.0 lit/min. At those experimental conditions, the aeration time was shortened from 9 hours when NH4Cl was used to 6 hours when AASAM was used. In both cases, the obtained rutile contains approx. 82% TiO2 and less than 0.5% metallic iron. The results indicated that AASAM could be used as a replacement for the NH4Cl catalyst in the aeration of reduced ilmenite.

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