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| Citation: |
GUO Lin, ZHANG Qiwu. Calcium-Aluminum Composite Material Prepared by Mechanochemical Method for Deep Defluorination[J]. Conservation and Utilization of Mineral Resources, 2021, 41(1): 9-14. DOI: 10.13779/j.cnki.issn1001-0076.2021.01.001
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Excessive fluoride content in water has always been one of the environmental issues of global concern. The calcium fluoride precipitation method produced by calcium-containing substances with the effluent concentration of 8-9 mg/L cannot meet the WHO standard that the fluorine content in drinking water is less than 1.5 mg/L. Based on the concept of mechanochemical activation, the goal of deep defluoridation of drinking water up to standard has been achieved by the Ca3Al2(OH)12 synthesized by grinding calcium aluminum hydroxide using planetary milling balls, which is based on a new defluorination mechanism of OH- and F- exchange. The prepared material can reduce the fluoride ion concentration from 10mg/L to 0.32 mg/L under the condition of the molar ratio of Ca: Al being 3:2, grinding time of 1h and the stirred speed of 500 r/min. Substituting kaolinite for aluminum hydroxide can also achieve similar deep defluorination, which provides new ideas and feasibility for the high purification of fluorine-containing wastewater.
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