The moving adsorbent purification method for removing 7 kinds of ion in ZnSO

4

or CdSO

4

solution was successfully used. The equipment is mainly made of 3 glass tubes. In the first tube

was placed a mixture of 10g activated char

1g MnO

2

a mix of 10g activated char

1g ZnO and 1g dimethylglypxime was in the second and of 10g activated char and lg NaBiO

3

in the third.When the solution of ZnSO

4

or CdSO

4

(conc

of ZnSO

4

or CdSO

4

:6%

Ph=5.5-5.8) flows across the three tubes successively

Cu

2+

Fe

2+

Co

2+

Ni

2+

Pb

2+

Mn

2+

and Cr

3+

ions in the original solution were adsorbed.This method of purification is very simple

and the final purified solution is stable.The method can be used also for purifing soluble salt solutions of alkali metals and alkali earth metals.