Effect of Organic Impurity on Seed Precipitation in Sodium Aluminate Solution

Zhang, Baiyong; Pan, Xiaolin; Yu, Huan; Tu, Ganfeng; Shi, Bi

doi:10.1007/978-3-319-72284-9_7

Cited by 4 publications

(1 citation statement)

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“…Several methods have been proposed to enhance the precipitation rate and speed, such as mechanical or thermal activation of the industrial seed [4,5], active seed and additive application [6][7][8], and operating conditions optimization [9]. Seed surface purification from organic and nonorganic species can also enhance seeded precipitation rate [10][11][12] because adsorbed impurities on the seed surface can reduce the active site availability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Precipitation of Gibbsite from Sodium Aluminate Solution by Adding Agglomerated Active Al(OH)<sub>3</sub> Seed

Shoppert¹,

Valeev²,

Alekseev³

et al. 2022

Preprint

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The addition of active seed for increasing the precipitation rate leads to the formation of fine Al(OH)3 particles that complicates separation of solid from the mother liquor. In this study, the enhanced precipitation of coarse Al(OH)3 from sodium aluminate solution using active agglomerated seed was investigated. Aluminum salt (Al2(SO4)3) were used for active agglomerated seed precipitation at the initial of the process. About 50% of precipitation rate was obtained when these agglomerates were used as a seed in the amount of 20 g L–1 at 25 °C within 10 h. The agglomerated active seed and precipitate samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). SEM images showed that agglomerates consist of flake-like particles that can be stick together by bayerite (β-Al(OH)3) acting as a binder. The precipitation temperature above 35 °C and the high concentration of free alkali (αk &gt; 3) lead to the agglomerates refinement that can be associated with the bayerite dissolution.

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