Zeolite modified and de-fluorination performance in zinc sulfate solution

Zeolite was used as the adsorbent and modified with lanthanum nitrate. An experimental study of the treatment of fluoride in zinc sulfate solution by modified zeolite was carried out. The influences of addition amount of modified bentonite,adsorption time,temperature and pH on the amount removal of fluoride were introduced. Energy dispersive X-ray analysis(EDX)and specific surface area(BET)were used to characterize the adsorbent before and after modified. The results show that the concentration of fluorine can be dropped from 100 mg/L to 45.56 mg/L,which conform to the provisions in the industrial production of less than 50 mg/L,when modified bentonite being added in an amount of 7.5 g/L,adsorption time being 25 min,temperature of 40 ℃ and pH=4. Variety of analytical tools show that,the lanthanum element payload on the surface of zeolite after the modification,and the layer spacing of zeolite and specific surface area are increased at the same time. I improves the fluoride removal performance of zeolite greatly.