Abstract
The decomposition process for zircon sand concentrate using mixed base of sodium hydroxide partly replaced by calcium oxide was inrestigated. It is found that the decomposition rate of zircon gradually increased with the increase of the reaction temperature and time. The decomposition rate is over 97% with the conditions that CaO/zircon molar ratio is 0.25 ∼ 0.75 at 800 °C for 1 h. Whereas the decomposition rate decreased when the molar ratio was more than 0.75. Also, thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) were used to study the reaction mechanism of zircon decomposition process with CaO-NaOH. The results showed that Na2O, which was generated by the reaction of CaO and Na4SiO4, increased the decomposition rate of zircon owing to its spread to the surface of zircon and played a role in decomposition process.
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References
Lin Z.H., Development, problem and prospect of zirconium chemicals in China, Rare Metals Letters, 2007, 26(1): 17.
Li Z.K., and Liu J.Z., Status and development of Zr & Hf materials used in nuclear in china, Rare Metals Letters, 2004, 2(35): 10.
Luo F.C., Lv W.G., Zheng J.Y., Xiao N., and Chen Z.X., The production of zirconium oxychloride and its application in new energy resource, Inorganic Chemicals Industry, 2003, 35(1): 10.
Liu C.H., Wang Z.B., Wang L.J., and Xiong B.K., Technical and economical comparison of zirconium oxychloride by basic process chlorination, Rare Metals Letters, 2007, 26(1): 97.
Biswas R.K., Habib M.A., Karmakar A.K., and Islam M.R., A novel method for processing of Bangladeshi zircon: Part I: baking, and fusion with NaOH, Hydrometallurgy, 2010, 103(1–4): 124.
Abdelkader A.M., Daher A., and Emad E., Novel decomposition method for zircon, Journal of Alloys and Compounds, 2008, 460(1–2): 577.
Bimal P.S., Bhattacharjee S., and Besra L., Optimisation of performance of dispersants in aqueous plasma dissociated zircon suspension, Ceramics International, 2008, 28(4): 413.
Li Z.J., Huang Y.X., Yao H.C., Yang M.L., and Chen J.L., Preparation of zirconium oxychloride via alkali fusing of zirconium carbide, Chinese Journal of Rare Metals, 2006, 30(3): 415.
Abdel-Rehim A.M., A new technique for extracting zirconium from Egyptian zircon concentrate, International Journal of Mineral Processing, 2005, 76(4): 234.
Tong J.Z., and Zhang Y.B., Preparation zirconium oxychloride from concentraterd Zr tails of Nb ore by lime, Journal of Chongqing University, 2003, 26(6): 112.
Rodríguez J.L., Rodríguez M.A., Aza S.D., and Pena P., Reaction sintering of zircon-dolomite mixtures, Journal of the European Ceramic Society, 2001, 21(3): 343.
Manhique A., Kwela Z., and Focke W., De wet process for the benefication of zircon: optimization of the alkali fusion step, Industrial and Engineering Chemistry Research, 2003, 42(4): 777.
Mohammed N.A., and Daher A.M., Preparation of high-purity zirconia from Egyptian zircon: an anion-exchange purification process, Hydrometallurgy, 2002, 65(2–3): 103.
Ondik H.M., and Mcmurdie H.F., Phase diagrams for zirconium and zirconia systems, American, The American Ceramic Society Press, 1998: 160.
Xiong B.K., and Lin Z.H., Preparation and Application of Zirconium Dioxide, Metallurgical Industry Press, Beijing, 2008: 80.
Wilson G., and Trans J.B., Subsolidus phase relations in the system Na2O-ZrO2-SiO2, British Ceramic Transactions, 1987, 86(6): 199.
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Zhang, J., Wang, L. & Jiang, D. Decomposition process of zircon sand concentrate with CaO-NaOH. Rare Metals 31, 410–414 (2012). https://doi.org/10.1007/s12598-012-0529-0
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DOI: https://doi.org/10.1007/s12598-012-0529-0