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Treatment of Fluorine-containing Waste Water from Sulfur Hexafluoride

Zhang Kui, Wang Huawen, Ye Guohong, Shen Kehong(Zhonghehonghua Special Gas Co.Ltd, Chendu Sichuan 611131)  
Method, principles for sulfur hexafluoride waste water treatment,process condition experiments and industrial production by calcium oxide is reviewed. Experiment results show that F in waste water is reduced from 30-50 g/L to 1 g/L,liquid caustic soda (KOH) concentration is increased from 25-50 g/L to 100-170 g/L through temperature increase by heating, reaction time extension and treatment by calcium oxide; Filtrate, which is filtered twice can fully meet the requirements of sulfur hexafluoride process.0.3 t KOH can be saved for each t sulfur hexafluoride.The process is beneficial to economics and environments.
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