Numerical Simulation on the Recovery Process of Acid Pickling Waste Liquor by Jet-Flow Pyrolysis

Lv, Chao

doi:10.1007/s11837-019-03827-8

Cited by 3 publications

(3 citation statements)

References 4 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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“…The direct discharge of HPWL will cause not only waste of a large amount of resources but also serious, irreversible pollution of the ecological environment and water environment. Thereby, some researchers and technologists have exerted a large amount of effort to find novel and efficient methods for HPWL treatment and disposal and resource treatment and utilization, e.g., distillation, − high temperature roasting/pyrohydrolysis, , crystallization, , solvent extraction, − electrolysis, − ion-exchange/acid-retardation methods, electrodialysis/membrane separation/diffusion dialysis, ,− a microwave-hydrothermal method, selective carbochlorination, adsorption, neutralization/precipitation, flocculant production for water treatment, − iron pigment production, ferrite production, , nanosized iron oxide production, − Fe 3 O 4 magnetic powder production, − and schwertmannite@akaganeite core/shell nanostructure production …”

Section: Introductionmentioning

confidence: 99%

Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

Zhang

Shu

et al. 2022

ACS Omega

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Steel hydrochloric acid pickling sludge (SHPS), containing the heavy metals Fe, Zn, and Ni and a high chloride salt content, is considered a type of hazardous solid waste because of its potential harm to human health and the environment. In addition, the SHPS yield is large, but the main treatment currently used is only safe for landfills. Although studying the composition and leaching toxicity of SHPS is of great importance, only a small amount of related literature is available. This paper can help compensate for this deficiency. SHPS is analyzed from the aspects of its formation mechanism, pH, moisture content, elemental concentration, phase composition, microstructure, and leaching toxicity. The results show that its pH ranges from 2.25 to 11.11, and the moisture content ranges from 45.47% to 83.34%. Additionally, the concentration of Fe is the highest, with values from 29.80% to 50.65%, while other alkali metal elements, namely, Ca, K, and Na, have values of 0.36% to 23.07%, 0.02% to 19.82%, and 0.38% to 3.31%, respectively. Heavy metal elements, namely, Zn, Ni, Mn, Cr, and Pb, have values of 0.02% to 14.88%, 0.001% to 0.05%, 0.03% to 0.38%, 0.01% to 0.09%, and 0.02% to 0.19%, respectively. Anions, namely, SO 4 2– , Cl – , F – , and NO 3 – , have contents of 0.09% to 0.34%, 0.54% to 5.73%, 0.001% to 0.04%, and 0.01% to 0.15%, respectively. X-ray diffraction (XRD) analysis shows that Fe and Zn are mainly present in oxides, Ca is present as CaO and CaCO 3 , and chlorine is present in NaCl. Moreover, scanning electron microscopy (SEM) analysis shows that the microscopic structure consists mainly of bright and fluffy irregular spheres; stripes; flakes; and dark, very small irregular particles. The leaching toxicity test based on HJ/T 299-2007 (China) was performed, where SHPS samples were treated with a mixed solution of sulfuric acid, nitric acid, and pure water (pH = 3.20 ± 0.05) at a liquid-to-solid ratio of 10:1 for a period of 18 h. The leachate was filtered and analyzed for Cr, Ni, Mn, Zn, etc. The leaching results indicate that Zn and Ni are the main elements that cause SHPS to be hazardous to the environment. These research results can provide a reference for later researchers studying the effective treatment of SHPS, such as more effective treatments for reducing toxicity and resource utilization.

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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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Numerical Simulation on the Recovery Process of Acid Pickling Waste Liquor by Jet-Flow Pyrolysis

Cited by 3 publications

References 4 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

Composition and Leaching Toxicity of Hydrochloric Acid Pickling Sludge Generated from the Hot-Dip Galvanized Steel Industry

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

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