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 heating the sodium sulfate and a specified additive. CONSTITUTION:To 100wt% Se-contg. sodium sulfate discharged from a stack gas desulfurization process is added 10-100wt% NH4Cl or NH4Br or 5-25wt% (NH4)2SO4 as an additive, and they are heated at 300-600 deg.C for 30min-2hr 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.