Simulation of Process and Reactor Structure Optimization for CeO2 Preparation from Jet-Flow Pyrolysis

Lv, Chao; Zhang, Dou; Zhao, Qiuyue

doi:10.1007/s11837-019-03397-9

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Lv et al [12][13][14] proposed a new process for the preparation of metal oxides by direct pyrolysis of a solution containing a rare earth chloride, magnesium chloride, and pickling waste hydrochloric acid, which incorporated a Venturi Reactor that atomized the solution using the heat generated by the combustion of methane to provide energy for the phase change of the solution and the pyrolysis of the metal chloride solution to obtain high-quality metal oxides. The structure of Venturi reactor contributes to a sharp increase of gas velocity at the throat.…”

Section: Introductionmentioning

confidence: 99%

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Yin

Sun

et al. 2023

CI&CEQ

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During pyrolysis of hydrochloric acid pickling waste liquid in a Venturi Reactor from iron and steel enterprises, the reaction products agglomera ted and hindered product recovery. Addition of citric acid to materials at the inlet improved product distribution. In this paper, a numerical simulation of the combustion, phase change, and gas-solid chemistry involved in a citric acid-added pickling waste liquid was conducted. These results showed that citric acid added to the inlet resulted in a peak concentration of carbon dioxide (CO2) in the back half of the venturi throat, and some ferric oxide (Fe2O3) underwent a secondary reaction to afford ferroferric oxide (Fe3O4). As the addition of citric acid increased, the flow of Fe2O3 at the outlet first increased and then decreased, while the flow rate of Fe3O4 first decreased and then increased. When the ratio of citric acid was 7%, the flow rate of Fe2O3 was the smallest and the flow rate of Fe3O4 was the largest.

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Section: Introductionmentioning

confidence: 99%

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Yin

Sun

et al. 2023

CI&CEQ

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“…In addition, this method ensures the independent growth of particles among atomized droplets and allows a narrow particle size distribution. In comparison with previous research which has indicated that spray pyrolysis cannot sufficiently control the morphology and structure of CeO 2 , this method can be used to quickly and efficiently prepare CeO 2 [ 18 , 19 ]. The size of the prepared CeO 2 particles can reach the micro-nano scale, but the occurrence of serious agglomeration reduces the specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

Bian

et al. 2021

Materials

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Green and short preparation of CeO2 nanoparticles with large specific surface area from rare earth extraction (CeCl3) was successfully achieved by spray pyrolysis (SP). In this method, a precursor solution is first prepared by mixing CeCl3, C6H8O, and H2O in the requisite quantities. Subsequently, the precursor consisting of a mixture of CeO2 and C was obtained by SP method by using the precursor solution. Finally, the calcination at 500 °C~800 °C in air for two hours to transform the precursor to CeO2 nanoparticles. Thermodynamic analysis and experimental studies were performed to determine the optimal SP temperature and citric acid amount. The results indicated that the maximum specific surface area (59.72 m2/g) of CeO2 nanoparticles were obtained when the SP temperature was 650 °C and the molar ratio of citric acid to CeCl3 was 1.5.

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“…Moreover, computational fluid dynamics (CFD) was used to simulate the spray pressure and temperature distribution in a pyrolysis furnace. Lv et al produced a mixture of gases and solids with the Venturi reactor, which improved the pyrolysis efficiency and prepared spherical CeCl 3 and Fe 2 O 3 micro/nanoparticles (Lv et al, 2019a;Lv et al, 2019b;Lv et al, 2019c;Lv, 2019). Venturi reactor can enhance the mix of the gas and liquid, and solve the problem of Ruthner spray pyrolysis method that the nozzle needs to be replaced periodically.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pyrolysis Conditions on the Preparation of Fe2O3 Particles Using Simulated Pickling Liquor in a Venturi Reactor

Sun

Yin

2021

Front. Mater.

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Large amounts of pickling liquor are produced during the pickling of iron and steel. The Venturi reactor is used during the pyrolysis of pickling liquor to prepare high-purity Fe2O3 particles. Changing the pyrolysis conditions will affect the purity and concentration of Fe2O3 particles. In this paper, physical experiments and numerical simulations were carried out to study the effect of pyrolysis conditions on the Fe2O3 particles, including the pyrolysis temperature, the FeCl2/FeCl3 ratio in the pickling liquor, and the citric acid ratio. The results showed that a product with a higher purity, better crystallinity, and greater concentration was obtained at 923 K. Further increasing the temperature did not change the concentration of Fe2O3 particles. When the ratio of FeCl2/FeCl3 in the pickling liquor was 1:1.5, the maximum concentration of Fe2O3 particles at the outlet was obtained. When the added proportion of citric acid was 1:1, the particle size distribution was more uniform, and when the added proportion was 1:2.5, the maximum concentration of Fe2O3 particles at the outlet was achieved.

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Simulation of Process and Reactor Structure Optimization for CeO2 Preparation from Jet-Flow Pyrolysis

Cited by 5 publications

References 9 publications

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Simulation study of citric acid effects on pyrolysis of hydrochloric acid pickling waste liquor

Green and Short Preparation of CeO2 Nanoparticles with Large Specific Surface Area by Spray Pyrolysis

The Effect of Pyrolysis Conditions on the Preparation of Fe2O3 Particles Using Simulated Pickling Liquor in a Venturi Reactor

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