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Supercritical Water Oxidation Treatment System

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 1583

Special Issue Editors


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Guest Editor
School of Marine Sciences, Guangxi Key Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning 530004, China
Interests: supercritical water oxidation; water treatment; advanced oxidation; high-temperature corrosion; hazardous waste; solid waste recycling; sludge treatment; industrial wastewater treatment
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Guest Editor
Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: supercritical water oxidation

Special Issue Information

Dear Colleagues,

Supercritical water oxidation has critical applications in treating hazardous wastes in many industries, including radioactive waste, rocket propellant waste, chemical weapon waste, munitions waste, and pharmaceutical waste. Still, the corrosion of component materials and the salt precipitation problem have been limiting its broad commercial prospects. Although many different reactors and processes have been designed through academic research and industry efforts, a general solution to reduce the cost of supercritical water oxidation technology applications remains to be found. Therefore, new strategies are urgently needed to control severe corrosion and the clogging of equipment by salt deposition. Hydrothermal molten salt and hydrothermal flame are up-and-coming methods. This Special Issue plans to give an overview of recent advances in the materials for supercritical water oxidation technology and their applications in different areas. This Special Issue also aims to contribute to the progress in the synthesis, characterization, and application of candidate materials for supercritical water oxidation technology devices in the treatment of refractory hazardous wastes.

Potential topics include, but are not limited to:

  • Salt deposition and plugging for supercritical water technology;
  • Corrosion of materials in supercritical water oxidation;
  • Future perspectives of candidate materials for supercritical water oxidation technology;
  • Application of supercritical water oxidation in the treatment of refractory waste materials.

Prof. Dr. Xingying Tang
Dr. Jianqiao Yang
Guest Editors

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Keywords

  • supercritical water
  • supercritical water oxidation (SCWO)
  • oxidation and corrosion
  • salt separation and deposition
  • waste treatment
  • water treatment
  • gasification
  • hazardous waste treatment
  • biomass waste
  • reactors

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Published Papers (1 paper)

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Research

17 pages, 5659 KiB  
Article
The Effect of Molten Phosphate on Corrosion of 316 Stainless Steel, Alloy 625, and Titanium TA8 in Supercritical Water Oxidation Conditions
by Zitao Lin, Pengwei Ren, Riguang Zhu, Xingying Tang, Youchang Zheng, Tiantian Xu, Yinghui Wang, Jianqiao Yang and Jianjun Cai
Materials 2023, 16(1), 395; https://doi.org/10.3390/ma16010395 - 1 Jan 2023
Cited by 4 | Viewed by 2027
Abstract
The early formation of phosphate oxide formed on 316 stainless steel (316 SS), nickel-based Alloy 625, and titanium alloy TA8 exposed in supercritical water (400 °C, 25 MPa) containing phosphate, chloride, and oxygen was investigated. Phosphate corrosion products of austenitic stainless steel displayed [...] Read more.
The early formation of phosphate oxide formed on 316 stainless steel (316 SS), nickel-based Alloy 625, and titanium alloy TA8 exposed in supercritical water (400 °C, 25 MPa) containing phosphate, chloride, and oxygen was investigated. Phosphate corrosion products of austenitic stainless steel displayed the severest spallation. Stable phosphates oxide films were inclined to form on Alloy 625. TiO2 and Ti2O3 are the two main components of oxide films on TA8. There is a strong synergistic effect between phosphates, oxygen, and supercritical water, leading to severe corrosion. The corrosion behavior of the three alloys at the top and bottom of the reaction tube was compared. Both at the top of the reaction tube and at the bottom of the reaction tube, TA8 showed an increase in mass. 316 SS and alloy 625 showed mass gain at the top and mass loss at the bottom. The alloys’ detailed molten corrosion mechanism after exposure to supercritical water is discussed. Full article
(This article belongs to the Special Issue Supercritical Water Oxidation Treatment System)
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