Sulfur phase and sulfur removal in high sulfur-containing bauxite
(1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China)
2. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China)
Abstract: The sulfur phase in high sulfur-containing bauxite was studied by an X-ray diffraction analysis and a chemistry quantitative analysis. The methods for the removal of different shaped sulfur were also discussed. The results show that sulfur phases in high sulfur-containing bauxites exist in the main form of sulfide sulfur (pyrite) or sulfate sulfur, and the main sulfur forms of bauxites from different regions are not the same. Through a combination of an X-ray diffraction analysis and a chemistry quantitative analysis, the sulfur phases of high sulfur-containing bauxite could be accurately investigated. Deciding the main sulfur form of high sulfur-containing bauxite could provide theoretical instruction for choosing methods for the removal of sulfur from bauxite, and an oxidizing-roasting process is an effective way to remove sulfide sulfur from high sulfur-containing bauxite, the content of S2− in crude ore in the digestion liquor is above 1.7 g/L, but in the roasted ore digestion liquor, it is below 0.18 g/L. Using the sodium carbonate solution washing technology to wash bauxite can effectively remove sulfate sulfur, the content of the total sulfur in ore is lowered to below 0.2% and can meet the production requirements for the sulfur content.
Key words: high sulfur-containing bauxite; sulfur phase; oxidizing-roasting; sodium carbonate solution washing technology