| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of removing a metal ion substituted with Ca in a compound of calcium phosphate base, and a method of recovering absorbent applied with the method of removing the metal ion and a method of recovering an absorbing device. <P>SOLUTION: The method of removing the metal ion substituted with the Ca in the calcium phosphate base compound comprises: a contact process for bringing the calcium phosphate base compound contact with a remover solution containing at least a kind of heterocyclic compound containing at least two Ns and its derivative as a principal ingredient; and a removing process for removing the remover solution, after the contact with the calcium phosphate base compound. Thereby, the metal ion substituted with the Ca of the calcium phosphate base compound is removed effectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
