离子交换法分离铜酞菁废水中钼的实验研究

Experimental study on separation of molybdenum from copper phthalocyanine wastewater by ion exchange

采用离子交换法分离铜酞菁废水中的钼,筛选出D301树脂分离性能最佳。通过静态吸附实验探讨树脂用量、溶液pH、初始浓度、吸附时间、温度等因素对吸附的影响。结果表明,树脂用量1 mL,pH=3.0,吸附时间18 h更适合作为吸附操作条件,提高初始浓度会使平衡吸附量增加,D301树脂吸附钼的过程符合Langmuir方程,为自发、熵增和吸热的过程。动态吸附实验得出,最佳进液流量为20 BV/h,树脂的饱和吸附量为181 mg/mL,钼的吸附率为31.5%。使用10%的氨水在2 BV/h的流量条件下对饱和树脂进行解吸,解吸剂用量5 BV时,解吸率可达84%,钼的富集倍数为152倍。

The separation effect of molybdenum in copper phthalocyanine wastewater was studied by ion exchange,and it was found that D301 resin had the best separation performance.The effects of resin dosage,initial concentration,solution pH,adsorption time,temperature on adsorption were studied by static adsorption experiments.The results show that the resin dosage of 1 mL,pH=3.0,and adsorption time of 18 h are more suitable as adsorption conditions,and the increase of the initial concentration will improve the equilibrium adsorption capacity.The results show that the adsorption process of molybdenum by D301 resin conforms to the Langmuir equation,which is a spontaneous,entropy-increasing and endothermic process.The dynamic adsorption results showed that the optimal feed flow was 20 BV/h,the adsorption capacity of the resin was 181 mg/mL when it reached saturation,and the adsorption rate of molybdenum was 31.5%.The saturated resin was desorbed with 10%ammonia at a flow rate of 2 BV/h.When the amount of desorbent was 5 BV,the desorption rate could reach 84%,and the enrichment ratio of molybdenum was 152 times.