Abstract: In a liquid-liquid leaching process for removing selenium from selenium-contaminated sulfur, the selenium-contaminated sulfur in dissolved in an organic solvent to form an organic solution including sulfur and selenium. Selenium in the organic solution is preferentially oxidized to form one or more hydrophilic compounds of selenium. The hydrophilic compounds of selenium are transferred into an aqueous solution by liquid-liquid leaching, thereby removing selenium contaminant from the organic solution and leaving purified sulfur therein. The organic solution is then separated from the aqueous solution for recovering the purified sulfur.