2020
DOI: 10.1016/j.hydromet.2020.105399
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New method to prepare high purity anatase TiO2 through alkaline roasting and acid leaching from non-conventional minerals resource

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Cited by 15 publications
(4 citation statements)
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“…To remove these impurities and excess sodium from titania, a preferential acid-leaching step is used. 16,17 In general, titanium hydrolyses as meta titanic acid at temperatures above 383 K. 18 To selectively separate the impurities from the titania, the temperature of the pressure leaching is maintained at 393 ± 2 K, and HCl is added to selectively leach impurities. The stoichiometric reactions that occur in the leaching stage are given below:2(Na 2 O) x (TiO 2 ) + 4× HCl → 4× NaCl (aq) + 2TiOCl 2 (aq) + 2× H 2 O + O 2 FeOOH + HCl + H 2 O → FeOCl (aq) + 2H 2 OMg(OH) 2 + 2HCl → MgCl 2 (aq) + 2H 2 OMn(OH) 2 + 2HCl → MnCl 2 (aq) + 2H 2 OTiOCl 2 (aq) + 2H 2 O → TiO(OH) 2 (s) + 2HCl (aq)…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…To remove these impurities and excess sodium from titania, a preferential acid-leaching step is used. 16,17 In general, titanium hydrolyses as meta titanic acid at temperatures above 383 K. 18 To selectively separate the impurities from the titania, the temperature of the pressure leaching is maintained at 393 ± 2 K, and HCl is added to selectively leach impurities. The stoichiometric reactions that occur in the leaching stage are given below:2(Na 2 O) x (TiO 2 ) + 4× HCl → 4× NaCl (aq) + 2TiOCl 2 (aq) + 2× H 2 O + O 2 FeOOH + HCl + H 2 O → FeOCl (aq) + 2H 2 OMg(OH) 2 + 2HCl → MgCl 2 (aq) + 2H 2 OMn(OH) 2 + 2HCl → MnCl 2 (aq) + 2H 2 OTiOCl 2 (aq) + 2H 2 O → TiO(OH) 2 (s) + 2HCl (aq)…”
Section: Resultsmentioning
confidence: 99%
“…To remove these impurities and excess sodium from titania, a preferential acid-leaching step is used. 16,17 In general, titanium hydrolyses as meta titanic acid at temperatures above 383 K. 18 To selectively separate the impurities from the titania, the temperature of the pressure leaching is maintained at 393 ± 2 K, and HCl is added to selectively leach impurities. The stoichiometric reactions that occur in the leaching stage are given below:…”
Section: Effect Of Process Parametersmentioning
confidence: 99%
“…The amount of other elements that are dissolved from the raw material is dependent on this factor as well. Moreover, the density and viscosity depend on sulphuric acid concentration and can result in unnecessary acid consumption, low fluidity, and high cost [16][17][18][19].…”
Section: Introductionmentioning
confidence: 99%
“…In general, the recovery of Waste-SCR catalysts can be achieved through a dry process or wet process. The dry recovery process is usually reliant on the molten salt reaction of a substance with strong alkalinity (such as NaOH, Na 2 CO 3 ), the Waste-SCR catalyst converting vanadium and tungsten into soluble vanadate and tungstate, and TiO 2 generating insoluble titanate, thereby realizing the separation of V, W, and Ti [3,4]. Nevertheless, TiO 2 recovered using this method tends to show mixed crystals of anatase and rutile, thus resulting in low purity.…”
Section: Introductionmentioning
confidence: 99%