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    Characteristics of Coal Slurry Aggregate Induced by Inorganic Salts

    Year: 2022

    Journal: Minerals, Volume 12, SEP

    Authors: Fan, Yuping; Zhang, Yangyang; Dong, Xianshu; Ma, Xiaomin; Li, Na; Jin, Wei

    Organizations: Fund for International Cooperation and Exchange of the National Natural Science Foundation of China [51820105006]; National Natural Science Foundation of China [52074189]; Fund for International Cooperation in Science and Technology of the Major Research Plan of Shanxi Province [201803D421104]; Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province

    Keywords: coagulation; critical coagulation concentration (CCC); quartz crystal microbalance with dissipation (QCM-D); floc size; floc structure

    The impact of coagulant type and dosage on the clarity, zeta potential, floc size, and floc structure of a coal slurry suspension was investigated. The results showed that the critical coagulation concentrations of trivalent ions are 0.81 mM and 0.018 mM for coal-coal and coal-kaolinite, respectively, which are lower than those of divalent ions. The initial settling was more affected by AlCl3 and FeCl3 than MgCl2 and CaCl2, while the supernatant turbidity was significantly decreased at a lower dosage (0.06 mM) for trivalent ions, consistent with the classical Derjaguin-Landau-Verwey-Overbeek theory, zeta potential results, and adsorption behaviors of quartz crystal microbalance with dissipation. The floc size and settling rate induced by AlCl3 and FeCl3 were greater than those of divalent ions at lower concentrations and tended to have an irregular and porous structure, enhancing the coagulation effect. The findings highlight the differences in the physical characteristics of floc size and structure in optimizing the coagulation process produced by electrical neutralization and sweep-floc coagulation of amorphous metal hydroxide precipitates.
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