Abstract
Low-grade bauxites and non-bauxite resources are widely distributed, which are suitable to extract alumina by the lime sinter process. The application of the lime sinter process is restricted by the high consumption of calcium, the large amount of slag and the poor alumina leaching property of clinkers. An improved lime sinter process based on the dry-sintering is proposed by adding Na2O-containing compounds to decrease CaO addition and increase alumina leaching property. The molar ratios of CaO to Al2O3 and Na2O to Al2O3 are 0.6 and 0.4, respectively. Na4Ca3(AlO2)10 as well as trace amounts of CaO•Al2O3 and 12CaO•7Al2O3 are formed after sintering at 1200°C for 30min in CaO-Al2O3-Na2O system, the alumina leaching efficiency of which is above 90%. The minerals after sintering in CaO-Al2O3-SiO2-Na2O system include Na4Ca3(AlO2)10, 12CaO•7Al2O3, 2CaO•SiO2 and 2CaO•Al2O3•SiO2. The leaching efficiency of clinkers increases as the sintering temperature increases to 1300°C.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
Reference
Sneha Samal, Ajoy K. Ray, Amitava Bandopadhyay, “Characterization and microstructure observation of sintered red mud-fly ash mixtures at various elevated temperature,” Journal of cleaner production, 101(15)(2015), 368–376.
Yu-sheng Wu, et al., “Effect of temperature on phase and alumina extraction efficiency of the product from sintering coal fly ash with ammonium sulfate,” Chinese Journal of Chemical Engineering, 22(11–12)(2014), 1363–1367.
Wan-chao Liu, Jia-kuan Yang, Bo Xiao, “Review on treatment and utilization of bauxite residues in China,” International Journal of Mineral Processing, 93(3)(2009), 220–231.
Paspaliaris Ioannis, Karalis Athanasios, “The effect of various additives on diasporic bauxite leaching by the Bayer process,” Light Metals, 1993, 35–39.
Shao-tao Cao, et al., “The phase transition in Bayer red mud from China in high caustic sodium aluminate solutions,” Hydrometallurgy, 140(2013), 111–119.
Sara J. Palmer, B. Jagannadha Reddy, Ray L. Frost, “Characterisation of red mud by UV-vis NIR spectroscopy,” Spectrochim. Acta A, 71(2009), 1814–1818.
Xiao-lin Pan, et al., “Effect of lime on digestion of gibbsitic bauxites at low temperature,” Journal of Northeastern University, 34(2013), 551–555.
Guang-hui Bai, et al., “Alkali desilicated coal fly ash as substitute of bauxite in lime-soda sintering process for aluminum production,” Transactions of Nonferrous Metals Society of China, 20(1)(2010), 169–175.
J. Grzymek, A. Derdacka-Grzymek, Z. Konik, “Some Physicochemical Properties of 12CaO.7Al2O3 Phase in Relation to Al2O3 Production from Self-Disintegrating Sinters,” Light Metals, 1987, 91–97.
Xiao-bin Li, et al. “Study and application of intensified sintering prcess for alumina production,” The Chinese Journal of Nonferrous Metals, 14(6)(2004), 1031–1036.
Bo Wang, et al., “Effects of sintering process parameters on physicochemical properties of calcium aluminate slag system,” The Chinese Journal of Process Engineering, 8(5)(2008), 949–952.
Hai-yan Yu, et al., “Effect of Na2O on formation of calcium aluminates in CaO-Al2O3-SiO2 system,” Transaction of Nonferrous Metals Society of China, 22(12)(2012), 3108–3112.
C. Ostrowski, J. Zelazny., “Solid solutions of calcium aluminates C3A, C12A7 and CA with sodium oxide,” Journal of Thermal Analysis and Calorimetry, 75(3)(2004), 867–885.
Yong-pan Tian, et al., “Phase transformation and leaching property of Na2O-doping calcium aluminate compounds,” CIESC Journal, 66(4)(2015), 1151–1156. (in Chinese)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 TMS (The Minerals, Metals & Materials Society)
About this chapter
Cite this chapter
Tian, Y., Pan, X., Yu, H., Han, Y., Tu, G., Bi, S. (2016). An Improved Lime Sinter Process to Produce Al2O3 from Low-Grade Al-Containing Resources. In: Williams, E. (eds) Light Metals 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48251-4_1
Download citation
DOI: https://doi.org/10.1007/978-3-319-48251-4_1
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48615-4
Online ISBN: 978-3-319-48251-4
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)