Abstract
The hydrolysis loss of digested alumina from bauxite reentering into the bauxite residue has always been the research focus during the Bayer process. The stability of sodium aluminate solution after digestion with different lime additions during the dilution process from a diasporic bauxite was studied, and the mechanism by which the lime addition affects was also discussed. The molar ratio, silica index and hydrolysis degree of diluted liquor after digestion are highly affected by the lime addition, and the corresponding alumina extraction efficiency of bauxite and the Na2O to SiO2 ratio of bauxite residue are changed. The stability of diluted liquor is firstly increased by the lime addition below 15% of the bauxite, and then decreased as the lime addition increases. The mineral content and proportion of desilication products precipitating during digestion are the main factors affecting the stability of sodium aluminate solution after digestion.
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.
References
Linxian Sun, “Discussion on the current situation and development strategies of alumina industry in China”, Light Metals, 2015, no. 1: 1–5.
Shiwen BI, and Haiyan YU, Production Technology of Alumina, (Beijing: Chemical Industry Press, 2006), 43.
B. Whittington, “The chemistry of CaO and Ca(OH)2 relating to the Bayer process”, Hydrometallurgy, 43 (1996), 13–35.
B. Whittington, and T. Fallows, “Formation of lime-containing desilication product (DSP) in the Bayer process: factors influencing the laboratory modelling of DSP formation”, Hydrometallurgy, 45 (1997), 289–303.
Loretta Y. Li, and G.K. Rutherford, “Effect of bauxite properties on the settling of red mud”, International Journal of Mineral Processing, 48 (3–4) (1996), 169–182.
Xiaolin Pan, Hai-yan Yu, Zong-hua Que, Ye Tian, Gan-feng Tu, and Shi-wen Bi, “Effect of precipitation activity of DSPs on stability of sodium aluminate solution” (The 6th International Conference of Hydrometallurgy, Beijing, October 2014), 690.
Xiaolin Pan, Haiyan Yu, and Ganfeng Tu, “Reduction of alkalinity in bauxite residue during Bayer digestion in high-ferrite diasporic bauxite”, Hydrometallurgy, 151 (2015), 98–106.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 TMS (The Minerals, Metals & Materials Society)
About this chapter
Cite this chapter
Jiang, T. et al. (2016). Effect of Lime Addition during Digestion on Stability of Digested Liquor of Diasporic Bauxite. In: Williams, E. (eds) Light Metals 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48251-4_8
Download citation
DOI: https://doi.org/10.1007/978-3-319-48251-4_8
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)