摘要
水体中氟化物含量超标一直是全球关注的环境问题之一,使用含钙物质生成氟化钙沉淀法,出水浓度一般在8~9 mg/L,不能满足饮用水中含氟低于1.5 mg/L的世卫标准。为此,本文基于机械力活化的概念,使用行星磨球磨钙铝氢氧化物合成加藤石材料[Ca_(3)Al_(2)(OH)_(12)],通过OH^(-)与F^(-)离子交换的新脱氟机理,实现了饮水达标的深度脱氟。在Ca:Al摩尔比为3:2、球磨1 h、转速为500 r/min的条件下,制备的材料可将氟离子浓度从10 mg/L降到0.32 mg/L。用高岭石代替氢氧化铝也能实现类似的深度脱氟,为含氟废水的高度净化提供了新的思路和可行性。
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 Ca_(3)Al_(2)(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.
作者
郭琳
张其武
GUO Lin;ZHANG Qiwu(School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China)
出处
《矿产保护与利用》
2021年第1期9-14,共6页
Conservation and Utilization of Mineral Resources
关键词
机械力球磨
深度脱氟
氟离子
加藤石相
高岭石
mechanochemistry
deep defluorination
fluoride ions
katoite
kaolinite
