Removal of chloride from simulated acidic wastewater in the zinc production

doi:10.1016/j.cjche.2018.06.025

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1037-1043.DOI: 10.1016/j.cjche.2018.06.025

• Separation Science and Engineering • 上一篇下一篇

Removal of chloride from simulated acidic wastewater in the zinc production

Weizao Liu¹, Li Lü¹, Yao Lu², Xiaowei Hu¹, Bin Liang¹

1 College of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 China Tin Group Co., Ltd., Liuzhou 545000, China

收稿日期:2018-05-29 修回日期:2018-06-14 出版日期:2019-05-28 发布日期:2019-06-27
通讯作者: Li Lü
基金资助:
Supported by the National Key Technology Support Program (2015BAB12B00), Key R & D projects of Sichuan province (2017GZ0377) and the Fundamental Research Funds for the Central Universities (2012017yjsy112).

Removal of chloride from simulated acidic wastewater in the zinc production

Weizao Liu¹, Li Lü¹, Yao Lu², Xiaowei Hu¹, Bin Liang¹

1 College of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 China Tin Group Co., Ltd., Liuzhou 545000, China

Received:2018-05-29 Revised:2018-06-14 Online:2019-05-28 Published:2019-06-27
Contact: Li Lü
Supported by:
Supported by the National Key Technology Support Program (2015BAB12B00), Key R & D projects of Sichuan province (2017GZ0377) and the Fundamental Research Funds for the Central Universities (2012017yjsy112).

摘要/Abstract

摘要： The removal of chloride from the zinc electrolyte produced during hydrometallurgical zinc production is challenging. The ion-exchange method is a promising way to remove chloride if the resin washing wastewater can be recycled. This paper focuses on chloride removal from resin washing wastewater to enable its reuse. Various processing factors including the oxygen gas velocity, temperature, and reaction time were investigated systematically. The results show that the optimal conditions for dechlorination are an oxygen gas velocity of 0.5 L·min^-1, a reaction temperature of 80℃, and a reaction time of 30 min. A dechlorination efficiency of 80% with a residual chloride ion concentration less than 200 mg·L^-1 was achieved, which meets the requirements for the recycling of wastewater. The presence of manganese accelerates the dechlorination by forming a Mn²⁺-MnO_2-MnO₄^--Mn²⁺ redox cycle. In this process, about 15 kg of the MnO₂ and all of the zinc can be recovered from 100 m³ wastewater, and the wastewater can be reused, which makes the ion-exchange method a promising technique for chloride removal.

关键词: Ion-exchange, Dechlorination, Ozone, Zinc production, Oxidation

Abstract: The removal of chloride from the zinc electrolyte produced during hydrometallurgical zinc production is challenging. The ion-exchange method is a promising way to remove chloride if the resin washing wastewater can be recycled. This paper focuses on chloride removal from resin washing wastewater to enable its reuse. Various processing factors including the oxygen gas velocity, temperature, and reaction time were investigated systematically. The results show that the optimal conditions for dechlorination are an oxygen gas velocity of 0.5 L·min^-1, a reaction temperature of 80℃, and a reaction time of 30 min. A dechlorination efficiency of 80% with a residual chloride ion concentration less than 200 mg·L^-1 was achieved, which meets the requirements for the recycling of wastewater. The presence of manganese accelerates the dechlorination by forming a Mn²⁺-MnO_2-MnO₄^--Mn²⁺ redox cycle. In this process, about 15 kg of the MnO₂ and all of the zinc can be recovered from 100 m³ wastewater, and the wastewater can be reused, which makes the ion-exchange method a promising technique for chloride removal.

Key words: Ion-exchange, Dechlorination, Ozone, Zinc production, Oxidation

Weizao Liu, Li Lü, Yao Lu, Xiaowei Hu, Bin Liang. Removal of chloride from simulated acidic wastewater in the zinc production[J]. 中国化学工程学报, 2019, 27(5): 1037-1043.

Weizao Liu, Li Lü, Yao Lu, Xiaowei Hu, Bin Liang. Removal of chloride from simulated acidic wastewater in the zinc production[J]. Chinese Journal of Chemical Engineering, 2019, 27(5): 1037-1043.

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Removal of chloride from simulated acidic wastewater in the zinc production

Removal of chloride from simulated acidic wastewater in the zinc production

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