Silica extraction from bauxite reaction residue and synthesis water glass

Bauxite reaction residue (BRR) produced from the poly-aluminum chloride (PAC) coagulant industry is a solid acidic waste that is harmful to environment. A low temperature synthesis route to convert the waste into water glass was reported. Silica dissolution process was systematically studied, includ...

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Autores principales:	Zhao Yunlong, Zheng Yajie, He Hanbing, Sun Zhaoming, Li An
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bauxite reaction residue silica extraction amorphous silica sodium silicate Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8ab4a237b0ba4853a6463a7b207cdad2
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spelling	oai:doaj.org-article:8ab4a237b0ba4853a6463a7b207cdad22021-12-05T14:10:49ZSilica extraction from bauxite reaction residue and synthesis water glass2191-955010.1515/gps-2021-0028https://doaj.org/article/8ab4a237b0ba4853a6463a7b207cdad22021-04-01T00:00:00Zhttps://doi.org/10.1515/gps-2021-0028https://doaj.org/toc/2191-9550Bauxite reaction residue (BRR) produced from the poly-aluminum chloride (PAC) coagulant industry is a solid acidic waste that is harmful to environment. A low temperature synthesis route to convert the waste into water glass was reported. Silica dissolution process was systematically studied, including the thermodynamic analysis and the influence of calcium and aluminum on the leaching of amorphous silica. Simulation studies have shown that calcium and aluminum combine with silicon to form hydrated calcium silicate, silica–alumina gel, and zeolite, respectively, thereby hindering the leaching of silica. Maximizing the removal of calcium, aluminum, and chlorine can effectively improve the leaching of silicon in the subsequent process, and corresponding element removal rates are 42.81%, 44.15%, and 96.94%, respectively. The removed material is not randomly discarded and is reused to prepare PAC. The silica extraction rate reached 81.45% under optimal conditions (NaOH; 3 mol L−1, L S−1; 5/1, 75°C, 2 h), and sodium silicate modulus (nSiO2:nNa2O) is 1.11. The results indicated that a large amount of silica was existed in amorphous form. Precipitated silica was obtained by acidifying sodium silicate solution at optimal pH 7.0. Moreover, sodium silicate (1.11) further synthesizes sodium silicate (modulus 3.27) by adding precipitated silica at 75°C.Zhao YunlongZheng YajieHe HanbingSun ZhaomingLi AnDe Gruyterarticlebauxite reaction residuesilica extractionamorphous silicasodium silicateChemistryQD1-999ENGreen Processing and Synthesis, Vol 10, Iss 1, Pp 268-283 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bauxite reaction residue silica extraction amorphous silica sodium silicate Chemistry QD1-999
spellingShingle	bauxite reaction residue silica extraction amorphous silica sodium silicate Chemistry QD1-999 Zhao Yunlong Zheng Yajie He Hanbing Sun Zhaoming Li An Silica extraction from bauxite reaction residue and synthesis water glass
description	Bauxite reaction residue (BRR) produced from the poly-aluminum chloride (PAC) coagulant industry is a solid acidic waste that is harmful to environment. A low temperature synthesis route to convert the waste into water glass was reported. Silica dissolution process was systematically studied, including the thermodynamic analysis and the influence of calcium and aluminum on the leaching of amorphous silica. Simulation studies have shown that calcium and aluminum combine with silicon to form hydrated calcium silicate, silica–alumina gel, and zeolite, respectively, thereby hindering the leaching of silica. Maximizing the removal of calcium, aluminum, and chlorine can effectively improve the leaching of silicon in the subsequent process, and corresponding element removal rates are 42.81%, 44.15%, and 96.94%, respectively. The removed material is not randomly discarded and is reused to prepare PAC. The silica extraction rate reached 81.45% under optimal conditions (NaOH; 3 mol L−1, L S−1; 5/1, 75°C, 2 h), and sodium silicate modulus (nSiO2:nNa2O) is 1.11. The results indicated that a large amount of silica was existed in amorphous form. Precipitated silica was obtained by acidifying sodium silicate solution at optimal pH 7.0. Moreover, sodium silicate (1.11) further synthesizes sodium silicate (modulus 3.27) by adding precipitated silica at 75°C.
format	article
author	Zhao Yunlong Zheng Yajie He Hanbing Sun Zhaoming Li An
author_facet	Zhao Yunlong Zheng Yajie He Hanbing Sun Zhaoming Li An
author_sort	Zhao Yunlong
title	Silica extraction from bauxite reaction residue and synthesis water glass
title_short	Silica extraction from bauxite reaction residue and synthesis water glass
title_full	Silica extraction from bauxite reaction residue and synthesis water glass
title_fullStr	Silica extraction from bauxite reaction residue and synthesis water glass
title_full_unstemmed	Silica extraction from bauxite reaction residue and synthesis water glass
title_sort	silica extraction from bauxite reaction residue and synthesis water glass
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/8ab4a237b0ba4853a6463a7b207cdad2
work_keys_str_mv	AT zhaoyunlong silicaextractionfrombauxitereactionresidueandsynthesiswaterglass AT zhengyajie silicaextractionfrombauxitereactionresidueandsynthesiswaterglass AT hehanbing silicaextractionfrombauxitereactionresidueandsynthesiswaterglass AT sunzhaoming silicaextractionfrombauxitereactionresidueandsynthesiswaterglass AT lian silicaextractionfrombauxitereactionresidueandsynthesiswaterglass
_version_	1718371676630024192

Silica extraction from bauxite reaction residue and synthesis water glass

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