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Dechlorination of zinc dross by microwave roasting

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Abstract

Traditional treatments of zinc dross have many disadvantages, such as complicated recovering process and serious environmental pollution. In this work, a new process of chlorine removal from zinc dross by microwave was proposed for solving problem of recycling the zinc dross. With better ability of absorbing the microwave than zinc oxide, the main material in zinc dross, chlorides, can be heated and evaporated rapidly during microwave roasting. Various parameters including roasting temperature, duration time and stirring speed were optimized. The microstructure of roasted materials was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The content of the chloride was analyzed by the method of chlorine ion selective electrode. The experiments indicate that the best duration time is 60 min with a stirring speed of 15 r/min during the microwave roasting process. The dechlorination rate reaches peak value of 88% at 700 °C. The chlorine is removed as HCl gas when water vapor is used as activating agent, which means that it can be recovered into hydrochloride acid.

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Authors and Affiliations

  1. National Local Joint Engineering Laboratory of Engineering Applications of Microwave Energy and Equipment Technology, Kunming, 650093, China

    Ya-qian Wei  (魏亚乾), Jin-hui Peng  (彭金辉), Li-bo Zhang  (张利波), Shao-hua Ju  (巨少华), Qin Zheng  (郑勤) & Ya-jian Wang  (王亚健)

  2. Key Laboratory of Unconventional Metallurgy of Ministry of Education (Kunming University of Science and Technology), Kunming, 650093, China

    Ya-qian Wei  (魏亚乾), Jin-hui Peng  (彭金辉), Li-bo Zhang  (张利波), Shao-hua Ju  (巨少华), Qin Zheng  (郑勤) & Ya-jian Wang  (王亚健)

  3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Ya-qian Wei  (魏亚乾), Jin-hui Peng  (彭金辉), Li-bo Zhang  (张利波), Shao-hua Ju  (巨少华), Qin Zheng  (郑勤) & Ya-jian Wang  (王亚健)

  4. Research Centre for Analysis and Measurement, Kunming University of Science and Technology, Kunming, 650093, China

    Yi Xia  (夏仡)

Authors
  1. Ya-qian Wei  (魏亚乾)
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  2. Jin-hui Peng  (彭金辉)
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  3. Li-bo Zhang  (张利波)
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  4. Shao-hua Ju  (巨少华)
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  5. Yi Xia  (夏仡)
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  6. Qin Zheng  (郑勤)
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  7. Ya-jian Wang  (王亚健)
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Corresponding author

Correspondence to Shao-hua Ju  (巨少华).

Additional information

Foundation item: Project(51104073) supported by the National Natural Science Foundation of China

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Wei, Yq., Peng, Jh., Zhang, Lb. et al. Dechlorination of zinc dross by microwave roasting. J. Cent. South Univ. 21, 2627–2632 (2014). https://doi.org/10.1007/s11771-014-2222-y

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  • DOI: https://doi.org/10.1007/s11771-014-2222-y

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