Process optimization of the extra-adding seeded hydrolysis of TiOSO4 to H2TiO3 by using the unenriched solution for the manufacture of TiO2 pigment

Lu, Ruifang; Лю, Чан; Wu, Jianchun; Sun, Wei; Sun, Qiang; Dong, Lichun

doi:10.1016/j.jcrysgro.2021.126268

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…Considering that HTD has been rarely applied as Ti source, it is necessary to figure out its structure and components. HTD is usually obtained by the hydrolysis of TiOSO 4 , which is the precursor of TiO 2 in industrial manufacture . The HTD exhibits a small particle size from the SEM image (Figure S3), and the X-ray diffraction (XRD) pattern in Figure S4 is consistent with that of anatase TiO 2 (JCPDS No.…”

Section: Resultsmentioning

confidence: 74%

“…HTD is usually obtained by the hydrolysis of TiOSO 4 , which is the precursor of TiO 2 in industrial manufacture. 48 The HTD exhibits a small particle size from the SEM image (Figure S3), and the X-ray diffraction (XRD) pattern in Figure S4 To verify an internal electric field existed in the H 2 TiO 3 / H 4 Ti 5 O 12 interface, a series of characterization analyses were employed. X-ray photoelectron spectroscopy (XPS) was conducted to detect the elemental compositions and interfacial interactions of the H 2 TiO 3 /H 4 Ti 5 O 12 composite (Figure S14).…”

Section: Extraction Mechanismmentioning

confidence: 99%

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Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance

Wan

et al. 2023

ACS Appl. Mater. Interfaces

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With potentially high lithium (Li) exchange capacity and long cycle ability, Ti-based oxides of H2TiO3 and H4Ti5O12 are considered to be promising Li-ion sieve (LIS) materials applied for Li resource extraction in the liquid phase. However, the LISs usually demonstrate unsatisfactory Li exchange performance under the approximately neutral condition without the strong impetus derived from the rapid combination between OH– in the surrounding solution and H+ ionized from LIS. Herein, a hybrid of H2TiO3/H4Ti5O12 with rich phase boundaries is constructed via a facile one-step solid-state method. Owing to the different Fermi energy levels of the two phases, the electrons are transferred at the phase interface between H2TiO3 and H4Ti5O12, developing an internal electric field (IEF). The built IEF provides an extra driving force to boost the solid-phase Li+ transport, hence enhancing the Li extraction kinetics. Threrfore, the H2TiO3/H4Ti5O12 hybrid exhibits outstanding Li exchange performance of 42.43 and 20.50 mg g–1 under alkaline and neutral conditions, corresponding to the hightest Li extraction rate of 5.30 and 2.05 mg g–1 h–1 reported so far. Our work offers an innovative strategy to promote the Li exchange performance of LIS especially under neutral conditions.

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Section: Resultsmentioning

confidence: 74%

Section: Extraction Mechanismmentioning

confidence: 99%

Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance

Wan

et al. 2023

ACS Appl. Mater. Interfaces

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“…The volume of the added DI water was then recorded to characterize the stability of the solution. The details of the method were derived from previous studies [19,20].…”

Section: Preparation Of Hydrolytic Crystal Seedsmentioning

confidence: 99%

The Ultrasound-Assisted Preparation of Crystal Seeds for the Hydrolysis of TiOSO4 to H2TiO3

Lu,

Li,

et al. 2023

Crystals

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The hydrolysis of an industrial titanyl sulfate (TiOSO4) solution to metatitanic acid (H2TiO3) is the crucial step in the production of titanium dioxide (TiO2) using the sulfuric acid process, and the extra-adding seeded route is generally adopted in industry, in which the quality of the crystal seeds plays a critical role. In this study, the optimal process conditions for preparing the crystal seeds via the NaOH neutralization method were first investigated. Then, the ultrasound-assisted preparation of crystal seeds was studied to explore the effect of the ultrasonic time and intensity on the particle size and particle size distribution of crystal seeds. The results demonstrated that ultrasonic assistance is helpful in obtaining crystal seeds with smaller particle sizes and more uniform particle size distribution, and the quality of the hydrolysis product of H2TiO3, i.e., the particle size and its distribution, is strictly correlated with those of the crystal seeds. Under the optimal process conditions for preparing the hydrolytic seeds, the average particle of the hydrolytic seeds prepared without ultrasonic assistance is 25.50 nm. In contrast, the introduction of ultrasonic assistance in the preservation stage could significantly decrease the particle size and narrow the particle size distribution of the hydrolytic seeds. When the ultrasonic time is 4 min and the ultrasonic intensity is 40 W, the average particle of the hydrolytic seeds is decreased to 23.48 nm. Therefore, the quality of the crystal seeds, as well as that of H2TiO3 products, could be significantly improved by introducing ultrasonic assistance with a suitable intensity at a suitable time in the preparation process of crystal seeds via the NaOH neutralization method.

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“…If V 3+ is oxidized to VO 2+ , this will lead to the formation and possible hydrolysis of Fe 3+ , so it is difficult to achieve acceptable co-removal of Fe/V. Therefore, it is necessary to increase the H 2 SO 4 concentration by vacuum evaporation, which significantly increases the energy consumption [ 19 , 20 ]. Another viable option is to separate the Fe/V from the original solution, such as via adsorption, extraction, etc.…”

Section: Introductionmentioning

confidence: 99%

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

Yang,

Peng,

Wang

et al. 2023

Nanomaterials

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Ti-bearing blast furnace slag (TBFS) can be converted to impurity bearing TiOSO4 solution for TiO2 pigment production. However, the H2TiO3 (MTA) hydrolyzed from the solution has too high Fe/V impurity to meet the standard for TiO2 pigment. In this study, we found that Fe3+ and V3+ were easily hydrolyzed and entered the MTA lattice, and hence could not be removed by washing. Furthermore, Fe/V was hard to co-remove by the traditional reduction method. Therefore, the Fe/V non-hydrolysis condition (Ti3+ = 0.01 M, F = 3.0, T = 130 °C; Ti3+ = 0.01 M, F = 3.5, T = 150 °C) was determined by thermodynamic calculations. However, at these conditions, the Ti hydrolysis ratio was low or the reaction time was long. Therefore, a new two-step hydrothermal hydrolysis process was proposed. Step 1 (130 °C, 2 h) ensured the non-hydrolysis of V3+, and Ti was partially hydrolyzed to increase the H2SO4 concentration. Step 2 (150 °C, 2 h) ensured a high Ti hydrolysis ratio (>0.95) and short total reaction time (4–6 h). Finally, a high-purity MTA was obtained (Fe = 21 ppm, V = 145 ppm). These results provide new insights into the control of the hydrolysis of impurity ions in solutions and help to optimize the process of TiO2 pigment preparation from TBFS.

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Process optimization of the extra-adding seeded hydrolysis of TiOSO4 to H2TiO3 by using the unenriched solution for the manufacture of TiO2 pigment

Cited by 9 publications

References 21 publications

Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance

Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance

The Ultrasound-Assisted Preparation of Crystal Seeds for the Hydrolysis of TiOSO4 to H2TiO3

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

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Process optimization of the extra-adding seeded hydrolysis of TiOSO4 to H2TiO3 by using the unenriched solution for the manufacture of TiO2 pigment

Cited by 9 publications

References 21 publications

Internal Electric Field Built on Heterointerface of H2TiO3/H4Ti5O12 Hybrid Enabling Promoted Li Extraction Performance

Internal Electric Field Built on Heterointerface of H2TiO3/H4Ti5O12 Hybrid Enabling Promoted Li Extraction Performance

The Ultrasound-Assisted Preparation of Crystal Seeds for the Hydrolysis of TiOSO4 to H2TiO3

Co-Removal of Fe/V Impurity in H2TiO3 Synthesized from Ti-Bearing Blast Furnace Slag

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Product

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Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance

Internal Electric Field Built on Heterointerface of H₂TiO₃/H₄Ti₅O₁₂ Hybrid Enabling Promoted Li Extraction Performance