SCANDIUM RECOVERY PROCESS

摘要

The purpose of the present invention is to recover roughly purified scandium, which is purified to an extent acceptable for a technique for highly purifying scandium, efficiently and without any complicated operation from a neutralization sediment (drainage sediment) generated in neutralizing acid mine drainage which contains a sulfur component. This scandium recovery process includes a washing step (S1) for washing a neutralization sediment (drainage sediment) and a dissolution step (S2) for subjecting the washed sediment obtained in the washing step (S1) to dissolution in an acid. It is preferable that the process further includes a re-dissolution step (S3) for subjecting a dissolution residue which remains after the dissolution in the dissolution step (S2) to dissolution with an acid. In the washing step (S1), it is preferable that the neutralization sediment (drainage sediment) is washed with a washing liquid until the pH of the post-washing liquid generated in the washing step becomes 6 or higher. In the dissolution step (S2), it is preferable that the washed sediment is dissolved in an acid with the system adjusted to pH 1-4.