Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 26    No. 5    May 2016

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Removal of S2- ion from sodium aluminate solutions with sodium ferrite
Xiao-bin LI1, Fei NIU1, Jie TAN1,2, Gui-hua LIU1, Tian-gui QI1, Zhi-hong PENG1, Qiu-sheng ZHOU1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Wanbao Mining Ltd., Beijing 100053, China

Abstract:The synthesis of sodium ferrite and its desulfurization performance in S2--bearing sodium aluminate solutions were investigated. The thermodynamic analysis shows that the lowest temperature is about 810 K for synthesizing sodium ferrite by roasting the mixture of ferric oxide and sodium carbonate. The results indicate that the formation process of sodium ferrite can be completed at 1173 K for 60 min, meanwhile raising temperature and reducing Na2CO3 particle size are beneficial to accelerating the formation of sodium ferrite. Sodium ferrite is an efficient desulfurizer to remove the S2- in aluminate solution, and the desulfurization rate can reach approximately 70% at 373 K for 60 min with the molar ratio of iron to sulfur of 1:1-1.5:1. Furthermore, the desulfurization is achieved by NaFeS2·2H2O precipitation through the reaction of and S2- in aluminate solution, and the desulfurization efficiency relies on the generated by dissolving sodium ferrite.


Key words: sodium ferrite; S2-; sodium aluminate solution; desulfurization

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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