自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 15    No. 6    December 2008

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Thermal decomposition behaviour of polyacrylamidomethyltrimethyl ammonium chloride in red mud separation process
HU Hui-ping(胡慧萍), ZHANG Kun-yu(张琨瑜), ZHANG Li-juan(张丽娟), CHEN Qi-yuan(陈启元)

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:In order to provide references for selecting highly efficient red mud flocculants, the behaviour of polyacryl- amidomethyltrimethyl ammonium chloride (PATAC) in red mud separation process was investigated. PATAC was employed as a flocculant for red mud separation from the caustic aluminate liquor at 95 ℃. The used red mud was generated from Chinese diaspore bauxite in Bayer process of alumina production. And the changes of PATAC before or after being treated in caustic solution at 95 ℃ were studied by thermogravimetry (TG) and Fourier transform infrared (FTIR) spectral analysis. The results show that PATAC fails in effectively flocculating red mud and PATAC is readily converted to a quaternary ammonium hydroxide (PATAH) in caustic solution. PATAH can be decomposed to a new polymer (HPATAH) even at 95 ℃. Furthermore, there is an intramolecular hydrogen bond formed in the HPATAH polymer chain with two functional groups of —CH2—OH and —CONH2. Therefore, the poor flocculation property of PATAC for red mud separation can be attributed to the thermal decomposition of PATAC in the caustic red mud slurry at 95 ℃ and the formation of intramolecular hydrogen bond in the polymer chain of HPATAH during the thermal decomposition, which causes the absorbable functional groups of PATAC to decrease greatly.

 

Key words: alumina; red mud; polyacrylamidomethyltrimethyl ammonium chloride (PATAC); settlement; thermal decomposition; intramolecular hydrogen bond

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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