Phenomena in late period of seeded precipitation of sodium aluminate solution
References (15)
A quantitative study of new crystal formation in seeds sodium aluminate solution [J]
J Crystal Growth
(1975)- et al.
The surface chemistry of Bayer process solids: a review [J]
Colloids and Surfaces
(1999) - et al.
The crystallization mechanism of Al(OH)3 from sodium aluminate solutions [J]
Journal of Crystal Growth
(2005) - et al.
About supersaturation and growth rates of hydragillite Al(OH)3 in alumina sodium solution [J]
J Crystal Growth
(1993) - et al.
Kinetics of decomposition of Bayer sodium aluminate solution [J]
The Chinese Journal of Nonferrous Metals
(1998) - et al.
Nucleation during gibbsites precipitation with seeds from sodium aluminate solution processed under ultrasound [J]
Trans Nonferrous Met Soc China
(2004) - et al.
Kinetics of seeded precipitation from sodium aluminate solution with high concentration [J]
J Cent South Univ (Science and Technology)
(2004)
Cited by (14)
Desilication of concentrated alkali solution by novel desilication reagent calcium hydroferrocarbonate: Part II. Desilication reaction and kinetics
2019, HydrometallurgyCitation Excerpt :The molar ratio of Na2O to Al2O3 (αk value in the alumina industry) in the leachate of the sub-molten salt process is typically above 10; thus, the crystallization of hydrous sodium aluminate instead of aluminum hydroxide is adopted according to the phase diagram of Al2O3-Na2O-H2O (Abramov, 1988; Cao et al., 2009) and the precipitated hydrous sodium aluminate is re-dissolved to obtain a sodium aluminate solution with an αk value of ~1.5 to precipitate aluminum hydroxide (Cao et al., 2009). As silicate and aluminosilicate contents induce a high viscosity in the diaspore (Li and Wu, 2012; Li et al., 2006; Liu et al., 2014; Lü et al., 2010; Wu et al., 2010), it is imperative to perform desilication before the crystallization of hydrous sodium aluminate from the solution. In traditional Bayer/lime Bayer/iron-hydrogarnet Bayer/sub-molten salt processes for alumina production, a digestion or pre-desilication stage in which the slurry is maintained at high volume fractions at high temperatures for several hours is included to encourage the precipitation of solubilized silica into desilication products (DSPs) (Smith, 2009; Smith, 2017; Whittington and Fallows, 1997; Whittington, 1996; Whittington and Cardile, 1996); the DSPs include sodalite (Na6(Al6Si6O24) Na2X,) in the traditional Bayer process, aluminum-hydrogarnet (Ca3Al2(SiO4)n(OH)12–4n) in the lime Bayer process (Smith, 2017; Whittington and Fallows, 1997; Zhao et al., 2002), iron-hydrogarnet (Ca3(Al/Fe)2(SiO4)3–x(4OH)x) in the iron-hydrogarnet Bayer process (Smith, 2017) and hydroxyl sodalite (Na8(AlSiO4)6(OH)2 2H2O) in the sub-molten salt process.
Desilication of concentrated alkali solution by novel desilication reagent calcium hydroferrocarbonate: Part I. Synthesis of desilication reagent
2018, HydrometallurgyCitation Excerpt :Simultaneously, the silica components in the mineral, including kaolinite, quartz, chamosite, and illite react with the alkaline medium, resulting in a 90% dissolution of silica into the liquor. The molar ratio of Na2O to Al2O3 (αk value in the alumina industry) in the leachate of the sub-molten salt process is typically above 10; thus, the crystallization of hydrous sodium aluminate instead of aluminum hydroxide is adopted according to the phase diagram of Al2O3-Na2O-H2O (Cao et al., 2009), and the precipitated hydrous sodium aluminate is re-dissolved to obtain a sodium aluminate solution with an αk value of ~1.5 to precipitate aluminum hydroxide (Abramov, 1988; Li et al., 2006; Liu et al., 2014, 2018). Owing to the higher viscosity due to the silicate and aluminosilicate content (Abramov, 1988; Li and Wu, 2012; Lü et al., 2010; Wu et al., 2010), it is imperative to perform desilication before the crystallization of hydrous sodium aluminate from the solution.
Hydrogen generation by aluminum corrosion in seawater promoted by suspensions of aluminum hydroxide
2009, International Journal of Hydrogen EnergyCitation Excerpt :Under these conditions equilibrium reaction (4) can readily transfer new formed Al(OH)3 from the Al surface to the existing nuclei via aluminate. In fact, mechanism of seeded nucleation and crystal growth of Al(OH)3 in caustic sodium aluminate solutions has been previously studied [40–42]. The Al–O–Al layer framework is identical for bayerite and gibbsite, which differ only in the packing arrangement of the layers [43].
Preparation of a nano-sized α-Al<inf>2</inf>O<inf>3</inf> powder from a supersaturated sodium aluminate solution
2009, Ceramics InternationalSpectra of sodium aluminate solutions
2007, Transactions of Nonferrous Metals Society of China (English Edition)
Foundation item: Project(2005CB623702) supported by the National Basic Research Program of China