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- Title
MICROSTRUCTURES AND MICROWAVE-ABSORBING PROPERTIES OF ZnO SMOKE FROM ZINC LEACH RESIDUE TREATED BY CARBOTHERMAL REDUCTION.
- Authors
ZHIWEI MA; SHENG WANG; XUEYAN DU; JI ZHANG; RUIFENG ZHAO; SHENGQUAN ZHANG
- Abstract
Much zinc residue is produced during the traditional processes involved in zinc hydrometallurgy in the leaching stage: its composition is complex and valuable metals are difficult to recover therefrom. if not handled properly, it can lead to a waste of resources and environmental pollution. To solve this problem, zinc leach residue specimens were treated using the carbothermal reduction method (CTR) that is easy to operate and has a high energy utilisation rate. The methods, such as X-ray diffraction (XRD), scanning electron microscopy (SeM), transmission electron microscopy (TeM), and scanning transmission electron microscopy (STeM) were used for analytical characterisation. Based on this, this research investigated a structure-function relationship between microstructures and microwave-absorbing properties of Zno smoke from CTR-treated zinc leach residue. The results demonstrate that microstructures and macro-properties of Zno smoke obtained at different temperatures differ greatly. under conditions including a calcination temperature of 1250°C, holding time of 60 min, and addition of 50% and 10% of powdered coal and Cao separately, the Zno content in the obtained smoke is 99.14%, with regular micron-sized Zno particles therein. for these particles, the minimum reflection loss (RLmin) reached -25.56 dB at a frequency of 15.84 ghz with a matching thickness of 5 mm. Moreover, frequency bandwidth corresponding to RL < -10 dB can reach 2.0 GHz. Zno smoke obtained using this method is found to have excellent microwave-absorbing performance, which provides a new idea for high-value applications of zinc-rich residue.
- Subjects
SMOKE; ZINC oxide; CARBONATITES; SCANNING transmission electron microscopy; ZINC; ENERGY consumption
- Publication
Archives of Metallurgy & Materials, 2021, Vol 66, Issue 4, p1163
- ISSN
1733-3490
- Publication type
Article
- DOI
10.24425/amm.2021.136437