The effect of inorganic salt in wastewater on the viscosity of coal water slurry
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The preparation of coal water slurry (CWS) using wastewater, which contains inorganic and organic components, is one method of wastewater utilization. In this study, the effect of inorganic salts on the viscosity of CWS was examined. The results show that monovalent salts (NaCl, KCl) decreased the viscosity of CWS. The viscosity of CWS was not affected by bivalent salts (CaCl2, MgCl2). However, CWS combined with trivalent salt (AlCl3) sharply increased the viscosity. The zeta potential of CWS with inorganic salts increased which can enhance the electric repulsion and beneficial to reduce the viscosity. The content of free water in CWS with trivalent salt decreased, and the freedom of the free water in CWS with trivalent salt decreased which were all bad to the viscosity and the adsorption of the dispersant on the particles. Compared with the surface polarity of the particles without inorganic salts, the surface polarity of the particles with divalent salts was similar to those without inorganic salts. Under the comprehensive influence, divalent salt has little effect on the viscosity of CWS.
KeywordsViscosity Inorganic salt Cations Coal water slurry Zeta potential Low-field NMR
This research was supported by the National Key R&D Program of China (2018YFC0808500), National Natural Science Foundation of China (21506059), the Shanghai Engineering Research Center of Coal Gasification (18DZ2283900), and the Fundamental Research Funds for the Central Universities.
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