METHOD FOR RECOVERY OF THALLIUM FROM AN AQUEOUS SOLUTION

摘要

The present invention relates to a method of removing impurities, especially thallium from an aqueous solution from an industrial process, using a chelating agent, especially an aminophosphonic or an iminodiacetic chelating resin. According to the present method, monovalent and trivalent thallium ions, which were difficult to remove in one process before the present invention, can be simply removed in one process. In addition, the present invention is very useful in the treatment of an aqueous solution containing a low concentration of thallium and a high concentration of other ingredients due to its high removal yield. The resulting purified aqueous solution treated with the present method contains preferably less than 0.1 ppm of thallium. After removing thallium from the solution, the thallium can be recovered selectively as thallium trihydroxide precipitate by oxidation and pH adjustment of the resin regeneration sludge, and then it can be reused in other processes.