Removal of chloride from simulated acidic wastewater in the zinc production

doi:10.1016/j.cjche.2018.06.025

Abstract

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

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

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.

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.

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