含铁物质对含硫离子在铝酸钠溶液中转化的影响.pdfVIP

Trans. Nonferrous Met. Soc. China 27(2017) 908−916 Effects of iron-containing phases on transformation of sulfur-bearing ions in sodium aluminate solution Xiao-bin LI, Fei NIU, Gui-hua LIU, Tian-gui QI, Qiu-sheng ZHOU, Zhi-hong PENG School of Metallurgy and Environment, Central South University, Changsha 410083, China Received 20 May 2016; accepted 23 November 2016 Abstract: Sulfides in the high-sulfur bauxite lead to serious steel equipment corrosion and alumina product degradation via the Bayer process, owing to the reactions of sulfur and iron-containing phases in the sodium aluminate solution. The effects of iron-containing phases on the transformation of sulfur-bearing ions (S2−, S O2 , SO2 and SO2 ) in sodium aluminate solution 2 3 3 4 were investigated. Fe, Fe O and Fe O barely react with SO2 and SO2 , but all of them, particularly Fe, can promote the 2 3 3 4 3 4 conversion of S O2 to SO2 and S2− in sodium aluminate solution. Fe can convert to Fe(OH) in solution at elevated 2 3 3 3 temperatures, and further react with S2− to form FeS , but Fe O and Fe O have little influence on the reaction behavior of S2− in 2 2 3 3 4 sodium aluminate