硅铝粉体陶瓷膜分离过程分析及膜清洗方法探讨

Silicon Aluminum Powder Liquid Ceramic Membrane Separation Process and Membrane Cleaning Method Discussed

分析了陶瓷膜分离低浓度硅铝粉体母液的过程,并探讨了膜清洗方法。多批次小试实验结果表明,物料浓缩10倍时,膜通量在300L/m2h左右且保持稳定,浓缩液中硅铝粉体浓度相应提高10倍左右。膜清洗首先考虑使用高温碱溶液或常温酸溶液,但单独的高温碱或酸并不能恢复膜通量,需两者组合清洗才能使膜通量恢复,酸碱的使用顺序不影响洗膜效果。由于常温下物料本身呈强碱性,因此常温碱对膜清洗没有效果。大批量实验结果表明,浓缩40倍后,膜通量虽有下降,但仍保持较好过滤性能。膜清洗后膜通量恢复,浓缩液中硅铝粉体含量符合要求,保证了实际工程的可行性。浓缩液循环实验表明,高浓度条件下长时间过滤,陶瓷膜仍然保持良好过滤性能。膜清洗后仍可恢复膜通量,保证了陶瓷膜使用寿命。

Analyzed the ceramic membrane separation process of low concentration silicon aluminum powder mother liquid, and discussed the membrane cleaning method. Multiple batches experimental results showed, membrane flux keep about 300 L/m2 h when material was 10 times concentrated. And the concentration of silicon silicon aluminum powder corresponding increased about 10 times. Membrane cleaning using high temperature alkali or normal temperature acid solution, but the high temperature alkali or normal temperature acid alone did not recover the membrane flux. The combination of high temperature alkali and normal temperature acid cleaning could restore the membrane flux, and the acid and alkali using order didn＇t affect the washing effect of membrane. Because materials are strong alkaline, normal temperature alkali on membrane cleaning hadn＇t effect. Large scale experimental results showed that the concentration after 40 times, membrane flux was decreased, but still maintained well filtering performance. Membrane flux was recovery after cleaning and silicon aluminum powder content in the concentrate met requirements,which ensured the feasibility of practical engineering. Concentrate cycle experiments showed that ceramic membrane maintain well filtering performance after high conce ntration for a long time filtration. Membrane flux could be recovery after cleaning, which ensured the service life of ceramic membrane.