Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide

Article


Wang, Ling Yun, Tong, Dong Shen, Zhao, Li Zhi, Liu, Feng Guo, An, Ning, Yu, Wei Hua and Zhou, Chun Hui. 2014. "Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide." Ceramics International. 40 (10), pp. 15503-15514. https://doi.org/10.1016/j.ceramint.2014.07.012
Article Title

Utilization of alum sludge for producing aluminum hydroxide and layered double hydroxide

ERA Journal ID4877
Article CategoryArticle
AuthorsWang, Ling Yun (Author), Tong, Dong Shen (Author), Zhao, Li Zhi (Author), Liu, Feng Guo (Author), An, Ning (Author), Yu, Wei Hua (Author) and Zhou, Chun Hui (Author)
Journal TitleCeramics International
Journal Citation40 (10), pp. 15503-15514
Number of Pages12
Year2014
PublisherElsevier
Place of PublicationKidlington, OX. United Kingdom
ISSN0272-8842
1873-3956
Digital Object Identifier (DOI)https://doi.org/10.1016/j.ceramint.2014.07.012
Abstract

The present work dealt with the utilization of alum sludge, which acted as an aluminum source, for producing aluminum hydroxide (Al(OH)3) and layered double hydroxide (LDH). The effects of the acid treatment and the neutralization with an aqueous sodium bicarbonate (NaHCO3) solution or with CO2 gas on the Al(OH)3 products were investigated. The Al(OH)3 samples were characterized by powder X-ray diffraction, Fourier transform-infrared spectroscopy, thermal analysis, scanning electron microscopy, X-ray energy dispersive spectroscopy and N2 adsorption-desorption. A maximum 87.23% yield of Al(OH)3 was achieved under conditions as follows: the treatment of 10g of alum sludge with 15 ml of sulfuric acid (16 mol/L) at 170°C for 1 h, followed by the separation of Fe(OH)3 and Al(OH)3. Depending upon the conditions of extraction and precipitation, the Al(OH)3 products appeared to be in the form of boehmite and bayerite or their mixture. Varying neutralization influenced the purity, yield, morphology, and texture of the Al(OH)3 products. Amorphous Al(OH)3 was obtained by using CO2 gas for the neutralization, whereas fiber-like crystalline Al(OH)3 was obtained by using an aqueous NaHCO3 solution for the neutralization. With addition of an external magnesium source, the resultant Al(OH)3 can then be converted into crystalline layered double hydroxide (LDH) by a coprecipitation and hydrothermal method. The results indicated that crystalline and amorphous Al(OH)3 can both undergo decomposition and subsequent reassembly with Mg species to form crystalline LDH.

Keywordsalum sludge; aluminumhydroxide; layered double hydroxide; alunite; sodium bicarbonate
ANZSRC Field of Research 2020401607. Metals and alloy materials
340399. Macromolecular and materials chemistry not elsewhere classified
340503. Organic chemical synthesis
Public Notes

Copyright 2014 Elsevier Ltd and Techna Group. Permanent restricted access to published version due to publisher copyright policy.

Byline AffiliationsZhejiang University of Technology, China
Institute for Agriculture and the Environment
Institution of OriginUniversity of Southern Queensland
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