废旧PTFE滤袋的清洗工艺研究
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摘要
废旧PTFE滤袋的深度填埋和焚烧处理给大气和生态环境造成严重的污染,因此对废旧PTFE滤袋需回收再利用。采用强酸和氧化剂对废旧PTFE滤袋进行清洗处理,研究清洗剂成分、清洗温度和时间对废旧滤袋白度和力学性能的影响。结果表明,滤袋经10%NaClO、80%H_2SO_4或72%HClO_4单组份溶液清洗后的白度值较低;提高清洗液的温度和浸泡时间可显著增大白度值;将滤袋经10%NaClO常温浸泡5d,再用H_2SO_4-HClO_4双组分溶液70℃下处理10h的清洗效果最佳,其白度值与未使用的新滤袋的白度值接近,且清洗工艺对废旧滤袋的力学性能无明显影响。
Deep landfill and incineration of waste PTFE filter bags result in serious pollution of atmosphere and ecological environment,so it is necessary to recycle the waste PTFE filter bags.In this study,strong acid and oxidant were used to clean the waste PTFE filter bags.The effects of the cleaning agent composition,clearing temperature and time on whiteness and mechanical properties of waste PTFE filter bags were investigated.The results show that the whiteness of waste PTFE filter bags is low when they are cleaned by 10% NaClO,80% H_2SO_4 or 72%HClO_4single-component solution.The whiteness can significantly increase by increasing clearing temperature and soaking time.The best cleaning result can be obtained when the waste PTFE bag is soaked in 10%NaClO solution for 5days under normal temperature,and then treated with H_2SO_4-HClO_4bi-component solution for 10 hat 70(C.The whiteness of waste PTFE filter bag is close to that of new PTFE filter bag.The cleaning process has no obvious effect on the mechanical properties of the waste PTFE bag.
Deep landfill and incineration of waste PTFE filter bags result in serious pollution of atmosphere and ecological environment,so it is necessary to recycle the waste PTFE filter bags.In this study,strong acid and oxidant were used to clean the waste PTFE filter bags.The effects of the cleaning agent composition,clearing temperature and time on whiteness and mechanical properties of waste PTFE filter bags were investigated.The results show that the whiteness of waste PTFE filter bags is low when they are cleaned by 10% NaClO,80% H_2SO_4 or 72%HClO_4single-component solution.The whiteness can significantly increase by increasing clearing temperature and soaking time.The best cleaning result can be obtained when the waste PTFE bag is soaked in 10%NaClO solution for 5days under normal temperature,and then treated with H_2SO_4-HClO_4bi-component solution for 10 hat 70(C.The whiteness of waste PTFE filter bag is close to that of new PTFE filter bag.The cleaning process has no obvious effect on the mechanical properties of the waste PTFE bag.
引文
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