SELECTIVE SEPARATION OF METAL ION

PURPOSE:To effectively and selectively separate metal ions by making metal ions adsorbed on a saturation adsorptive zone until it is saturated to increase the concentration, introducing the adsorbed metal ions to a chromato-separation zone by a regenerant to perform chromato-separation before performing regeneration. CONSTITUTION:A liquid to be treated is introduced into a saturation adsorptive zone 10 from a liquid to be treated tank 9 through a valve 3 and circulated through the tank 3 by a valve 2. Meanwhile, metal ions in the liquid to be treated is adsorbed on the saturation adsorptive zone 10 until it is saturated according to the adsorptive property of the packing. Next the valves 2, 3 and a valve 9 are closed and a regenerant is introduced into the saturation adsorptive zone 10 from a line 12, and further the liquid is introduced into a chromato- separation zone 11 through a valve 5 as it is and it is caused to flow out from a line 16 through a valve 6 while it is given chromato-separation. While the regenerant is passed, when metal ion groups having weak adsorptivity finish flowing out from the line 16, the other metal ion groups remain in a ctromato- separation zone 11. Then the valves 5, 6 are closed and a regenerant is introduced to regenerate the residual metal ions.