文档介绍：Defluorination in high Fluoride-bearing water
with electric field and limestone
Xu Fen, Yuan Jianfei, Guo Shugang Luo Zhaohui
Graduate School School of Environmental Studies
China University of Geosciences, CUG China University of Geosciences, CUG
Wuhan, China Wuhan, China
******@126..com ******@cug.
Abstract-High F- in water can be removed by Ca2+ in form of years, there are many new and improved methods on the basis
precipitation of CaF2 in water when their ion activity of the above methods, but it is not widely promoted in the rur-
production(IAP) reaches up to equilibrium dissolution constant al areas because of high cost, complicated operation, difficult
of fluorite based on the precipitation theory of insoluble maintenance and so on. We attempt to develop a low-cost
minerals. Self-designed tank is used to generate a large number
2+ 2 limestone filled reactor, dissociated by the effect of electric
of Ca and CO3 ¯ from dissolution of limestone under the effect
of electric field, then the Ca2+ and F- movement to the cathode field to provide calcium ions for the precipitation to remove
and anode respectively leads to partial accumulation in certain excessive fluoride from drinking water.
2+ - 2
area. When [Ca ][ F ] >Ksp(CaF2), CaF2 precipitates. The effect
of voltage (U), distance of cathode and anode (d) and time (t