TY - JOUR

T1 - Enhanced Precipitation of Gibbsite from Sodium Aluminate Solution by Adding Agglomerated Active Al(OH)3 Seed

AU - Shoppert, Andrei

AU - Valeev, Dmitry

AU - Alekseev, Konstantin

AU - Loginova, Irina

N1 - This research was funded by the Project of the State Assignment, FEUZ-2021-0017. The method used to determine the chemical composition of solutions by ICP-OES (see Section “Analysis”) were funded by the Project of the State Assignment (Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, No. FMUS-2019-24).

PY - 2023

Y1 - 2023

N2 - 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 (Al-2(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 degrees 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 (beta-Al(OH)(3)) acting as a binder. The precipitation temperature above 35 degrees C and the high concentration of free alkali (alpha(k) = 1.645Na(2)O(k)/Al2O3 > 3) lead to the agglomerates refinement that can be associated with the bayerite dissolution.

AB - 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 (Al-2(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 degrees 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 (beta-Al(OH)(3)) acting as a binder. The precipitation temperature above 35 degrees C and the high concentration of free alkali (alpha(k) = 1.645Na(2)O(k)/Al2O3 > 3) lead to the agglomerates refinement that can be associated with the bayerite dissolution.

UR - https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=000940713600001

UR - http://www.scopus.com/inward/record.url?partnerID=8YFLogxK&scp=85149251459

U2 - 10.3390/met13020193

DO - 10.3390/met13020193

M3 - Article

VL - 13

JO - Metals

JF - Metals

SN - 2075-4701

IS - 2

M1 - 193

ER -