Zinc Ash Recycling and the System of Supercritical Hydrothermal Synthesis of Nano-Zinc Oxide

被引：0
|
作者：
Liu L. [1 ]
Wang S. [1 ]
Liu W. [1 ]
Zhang B. [1 ]
Liu H. [1 ]
Zhao J. [1 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2024年 / 58卷 / 03期
关键词：
high-value utilization; nano-zinc oxide; recycling of zinc ash; supercritical hydrothermal synthesis;
D O I：
10.7652/xjtuxb202403018
中图分类号：
学科分类号：
摘要：
In this study, a combination of wet recovery process and supercritical hydrothermal synthesis technology is employed to produce high-value nano-zinc oxide products from zinc ash? and an economic analysis of this approach to zinc ash recycling is conducted. A sound system is established using Aspen Plus, and material costs and energy consumption during system operation are analyzed. The leaching rate of zinc in the zinc ash exceeds 95%, under the conditions of sulfuric acid concentration of 2 mol • L-1, solid-liquid ratio of 1:8, leaching temperature of 50 °C, leaching time of 2 h, and stirrer speed of 300 r • min-1. Fe, Al, Ni, Cu and other impurities are eliminated in the impurity removal process, and the zinc content in the solution after impurity removal reaches 97%. The leaching solution of zinc ash is used to synthesize nano-zinc oxide with an average particle size of 26 nm under supercritical conditions of 400 °C and 25 MPa. The resulting zinc oxide exhibits excellent crystallinity and high purity. The comparison with nano-zinc oxide synthesized from pure materials validates the feasibility of this technology, which significantly improves the system?s economic viability. © 2024 Xi'an Jiaotong University. All rights reserved.
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页码：193 / 203
页数：10
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