Abstract
Hydroxamated polyacrylamide (HPAM) was synthesized from polyacrylamide (PAM) with high relative molecular mass under the optimum reaction conditions (pH 12 and a molar ratio of hydroxylamine to amide groups of 1.5 at 50 °C for 12 h). The hydroxamate groups of HPAM were verified by Fourier transform infrared spectrum (FT-IR). 46% (molar fration) hydroxamate groups and 23% (molar fraction) carbonyl groups on HPAM were determined by conductometric titration combined with Kjeldahl’s microanalysis method. The settling performance achieved at different flocculant dosages was investigated with high goethite-containing red mud slurry of simulated Bayer process synthesized in laboratory. It turns out that the settling performance of high goethite-containing red mud was better with HPAM. The average settling rate of red mud in the first 5 min and the turbidity of supernatant after settling for 30 min are 2.36 m/h and 507 NTU, respectively, at a flocculant dosage of 120 g/t, which is similar to that achieved with Hx-600.
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Foundation item: Project(51174231) supported by the National Natural Science Foundation of China
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Liu, Jw., Hu, Hp., Wang, M. et al. Synthesis of modified polyacrylamide with high content of hydroxamate groups and settling performance of red mud. J. Cent. South Univ. 22, 2073–2080 (2015). https://doi.org/10.1007/s11771-015-2731-3
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DOI: https://doi.org/10.1007/s11771-015-2731-3