METHOD OF REFINING IRIDIUM AQUEOUS SOLUTION

摘要

PROBLEM TO BE SOLVED: To provide a method of obtaining a refined iridium aqueous solution efficiently from an aqueous solution containing iridium and impurity elements.

SOLUTION: The method of removing the platinum group elements other than iridium from the aqueous solution containing iridium and other platinum group element includes: a step (1) of obtaining a first filtrate by adding metal bismuth in the solution having pH controlled to <3.0 to reduce and deposit the platinum group element except iridium and filtering to remove the deposited material; and a step (2) of obtaining a second filtrate by adding a base to the first filtrate to control the pH to≥3.0 to deposit and settle the dissolved bismuth component and removing the deposited material form the first filtrate by filtration.

COPYRIGHT: (C)2011,JPO&INPIT