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Novel Dispersant with a Three-Dimensional Reticulated Structure for a Coal–Water Slurry

Li, Lian, Zhao, Linyan, Wang, Yixi, Wu, Jianning, Meng, Guihua, Liu, Zhiyong, Zhang, Jianshu, Hu, Baixing, He, Qihui, Guo, Xuhong
Energy & fuels 2018 v.32 no.8 pp. 8310-8317
Fourier transform infrared spectroscopy, coal, dispersants, nuclear magnetic resonance spectroscopy, pulping, rheology, slurries, surface tension, tannins, China
A novel type of large reticulation, three-dimensional structure of a coal–water slurry dispersant was designed and synthesized, which was mainly used to test the Xinjiang Zhundong coal with abundant reserves and poor slurrying performance. The same types of three dispersants (TIA-1, TIA-2, and TIA-3) were made by adjusting the amount of tannic acid (TA). Commercial NDF dispersant is used for comparison. TA molecules were linked into reticulation by a linker (1,6-dibromohexane) and then modified with 2-acrylanmido-2-methylpropanesulfonic acid and itaconic acid on this reticulated structure. The structure of TIA was confirmed by Fourier transform infrared spectroscopy and ¹H nuclear magnetic resonance. The rheology and stability indicated that the optimal amount of this dispersant was 0.1 wt %, and its pulping concentration was increased to 59 wt %. The dispersants of TIA-1, TIA-2, and TIA-3 comparative tests demonstrated that TIA-1 exhibited excellent stability and rheology, reducing the dosage of the dispersant. The experiment showed that the concentration of slurry could reach 59% with the dosage of 0.1%. This is mainly attributed to the excellent large reticulation, three-dimensional structure of TIA-1. This special structure has polar and nonpolar sites that can efficiently coat coal particles and change the interfacial tension effectively between coal and water.