REMOVING METHOD FOR SELENIUM FROM SELENIUMMCONTAINING SODIUM SULFATE

摘要

PURPOSE:To vaporize and remove Se from Se-contg. sodium sulfate at a high removing rate by allowing sulfuric acid vapor to be absorbed in the sodium sulfate followed by heating. CONSTITUTION:Se-contg. sodium sulfate discharged from a stack gas desulfurization process is exposed to an atmosphere of sulfuric acid vapor to allow the vapor to be absorbed in the sodium sulfate, which is then heated at 200-600 deg.C for =30min to vaporize and remove the Se from the sodium sulfate. By bringing the resulting Se-contg. gas into contact with water or an aqueous alkali soln., the Se can be recovered easily.