高盐高COD废水深度除氟试验研究

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关键词：高盐废水；高化学需氧量（COD）废水；含氟废水；除氟；废水处理中图分类号：X703 文献标识码：A 文章编号：1008-9500（2025）05-0023-06DOI： 10.3969/j.issn.1008-9500.2025.05.005

Abstract： The high salt and high Chemical Oxygen Demand （COD）fluorine-containing wastewater generated during the recycling process of waste ternary lithium baterycathode materials is takenas theresearch object，thedefluorination experimentof wastewateris cariedout using the defluorinationagent KF-O2 to investigate theefectsof reaction pH， temperature，time，and dosage on the fluoride removal eficiency in wastewater，two stage defluorinationoptimization experiments are conducted，and the defluorination mechanism is analyzed bycharacterizationusing Scanning Electron Microscopy-Energy Dispersive Spectroscopy （SEM-EDS），X-Ray Diffraction （XRD）and other methods.The resultsshow that under the conditions of pH=7， temperature 30 ΔC ，and reaction time 3O min， using a tw stage defluorination process with a dosage of 6g/L for the first stage and 3 g/L for the second stage，the effuent fluoride concentration can be reduced to 7.82 mg/L，and the fluoride removal rate reaches 98.7% ， meeting the production requirements of the enterprises （less than 10mg/L ）.The P and COD in the wastewater are efficiently and synchronously removed， with removal rates of 97.5% and 54.4% ，respectively.Fluoride ions in wastewater are mainly removed by forming cryolite precipitation with aluminum ions in the defluorination agent.

Keywords： high salt wastewater; high Chemical Oxygen Demand（COD）wastewater; fluorine-containing wastewater; defluorination; wastewater treatment

废旧三元锂电池正极材料回收一般采用湿法冶金工艺，通过浸出、萃取、沉淀等工序回收其中的镍、钴、锰、锂等有价金属，回收过程会产生大量高盐、高化学需氧量（Chemical Oxygen Demand，COD）含氟废水[1]，其中氟不仅危害环境和人体健康，也会对设备造成严重的腐蚀[2。（剩余6583字）