The interaction of bayerite and silicic acid in slightly acid solutions under ambient conditions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F05%3A00031059" target="_blank" >RIV/00216224:14310/05:00031059 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

čeština

Original language name

Interakce bayeritu a kyseliny křemičité v slabě kyselém prostředí za normálních podmínek

Original language description

Interaction between bayerite, Al(OH)3, and silicic acid, H4SiO4, was studied in slightly acid solutions (pH ~ 4.2) at three Si/Al molar ratios (1:1, 1:3 and 1:5) under using of stirred batch reactors. The initial concentrations of H4SiO4 were 1.65x10-3 mol l-1 in all solutions. Two different concentrations of alkaline metals (K, Na), zero and 2x10-3 mol l-1, were adjusted in the solutions. At the initial stage of experiment (0-2 days), the H4SiO4 concentrations quickly decrease to the roughly limit values, between 1.55x10-3 and 1.60x10-3 mol l-1. This decrease, relatively slight (from 5x10-5 to 1x10-4 mol) and rapid (from -8.10-6 to -7.10-5 mol l-1 day-1), was linearly dependent on the bayerite content; it was interpreted as a (chemi)sorption of H4SiO4on bayerite surface. At the advanced stages of experiment (2 200 days), the concentrations of H4SiO4 stagnated (the slopes of kinetic curves range from -7.10-8 to +2.10-7 mol l-1 day-1).

Czech name

Interakce bayeritu a kyseliny křemičité v slabě kyselém prostředí za normálních podmínek

Czech description

Interaction between bayerite, Al(OH)3, and silicic acid, H4SiO4, was studied in slightly acid solutions (pH ~ 4.2) at three Si/Al molar ratios (1:1, 1:3 and 1:5) under using of stirred batch reactors. The initial concentrations of H4SiO4 were 1.65x10-3 mol l-1 in all solutions. Two different concentrations of alkaline metals (K, Na), zero and 2x10-3 mol l-1, were adjusted in the solutions. At the initial stage of experiment (0-2 days), the H4SiO4 concentrations quickly decrease to the roughly limit values, between 1.55x10-3 and 1.60x10-3 mol l-1. This decrease, relatively slight (from 5x10-5 to 1x10-4 mol) and rapid (from -8.10-6 to -7.10-5 mol l-1 day-1), was linearly dependent on the bayerite content; it was interpreted as a (chemi)sorption of H4SiO4on bayerite surface. At the advanced stages of experiment (2 200 days), the concentrations of H4SiO4 stagnated (the slopes of kinetic curves range from -7.10-8 to +2.10-7 mol l-1 day-1).

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DD - Geochemistry

OECD FORD branch

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Project

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Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2005

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geologické výzkumy na Moravě a ve Slezsku v roce 2004

ISSN

1212-6209

e-ISSN

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Volume of the periodical

XII

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

2

Pages from-to

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UT code for WoS article

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EID of the result in the Scopus database

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