Experimental study on the electrolytic treatment of ammonia and chlorine in the wastewater from the precipitation of rare earth carbonate |
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Authors: | Dong-Jie Wang Xiao-Long Tang Su-Mei Wang Wen-Liang Guo Jian-Ting Li |
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Affiliation: | 1. Energy and Environmental Engineering School, University of Science and Technology, Beijing, Beijing, China;2. State Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Inner Baotou, Mongolia, China;3. Ruike National Engineering Research Center of Rare Earth Metallurgy and Functional materials, Baotou, Inner Mongolia, China;4. State Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Inner Baotou, Mongolia, China |
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Abstract: | The high concentration of ammonium chloride in the wastewater from the precipitation of rare earth carbonate was studied by an electrolytic method in this paper. The decomposition rate of ammonium chloride is obtained by electrolysis experiment, and the main components of wastewater can be transformed into raw and auxiliary materials that can be reused in the rare earth smelting process, so as to achieve the purpose of treating rare earth carbonate precipitation wastewater and provide a new method for the treatment of rare earth carbonate precipitation wastewater. The principle of the electrolysis process is analyzed in this study, and the optimum electrolysis factor is determined by the condition experiment. The changes in membrane materials and electrode materials before and after use are discussed. The experiments of stripping ammonia water and the reaction conditions of the formation experiment of ammonium bicarbonate are studied. The rare earth carbonate precipitation wastewater with the initial ammonium chloride concentration of 50 g/L was electrolyzed. The concentration of ammonia chloride was reduced to 3.5 g/L after electrolysis, and the electrolysis rate exceeded 90%. The purity of the ammonium chloride after electrolysis could exceed 93%. No industrial reagent was introduced in the electrolysis process, and no other pollutants were produced. |
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Keywords: | Rare earth carbonate ammonium chloride wastewater electrolysis process precipitation |
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