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    ZHANG Zhengke, CHEN Hang, SONG Xingfu. An Exploration on Removal of Zinc Ion in Salt Separation Crystallization Residue of Coal Chemical Industry High-Salt Wastewater[J]. Journal of East China University of Science and Technology, 2022, 48(6): 744-749. DOI: 10.14135/j.cnki.1006-3080.20210523001
    Citation: ZHANG Zhengke, CHEN Hang, SONG Xingfu. An Exploration on Removal of Zinc Ion in Salt Separation Crystallization Residue of Coal Chemical Industry High-Salt Wastewater[J]. Journal of East China University of Science and Technology, 2022, 48(6): 744-749. DOI: 10.14135/j.cnki.1006-3080.20210523001

    An Exploration on Removal of Zinc Ion in Salt Separation Crystallization Residue of Coal Chemical Industry High-Salt Wastewater

    • Taking the high-salt wastewater from the coal chemical industry as the research object, the simulation calculation of the occurrence state of zinc ions in the high-salt system was implemented, in which the trend of the proportion change of various forms of Zn2+ with different pH values, temperature, and NaCl mass concentrations was obtained. Using Na2S as a precipitant, the effects of stirring speed, initial pH value, dosage of sodium sulfide and other process conditions on the performance of deep removal of zinc ions were researched. The results indicated that adjusting the initial pH value of high-salt organic wastewater to neutral or above was beneficial to the removal of zinc ions by sulfide precipitation method. At the condition of reaction temperature 25 ℃, reaction time 20 min, stirring speed 300 r/min, initial pH 8.0, and n (Zn2+)∶n (S2−)=1.0∶1.0, the wastewater discharging standard of the residual liquid is satisfying.
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