Fluoride Removal Agent Of Kaolin-based Preparation And Ligand Exchange Of Fluoride Removal Performance And Technology Research

Fluorine is one of essential trace elements that maintains normal physiological activity. Too many or too low fluoride ions in drinking water are harmful to the consumer's health,a suitable concentration of fluoride in drinking water is beneficial for the prevention of dental caries. Groundwater and drinking water sources land with high fluorine distribute widely in arid and semiarid region of North-West China,there are about 70 million of people suffering from endemic disease caused by extra intake of fluoride from drinking water. Our government always premium improvement and treatment of Fluorine containing water,but the research of defluoridation at present exist limitation, accordingly limit the actual application. So it is important to investigate the cost-effective methods of defluoridation from drinking water.In this paper, a detail analysing and discussion of the existing defluoridation methods is made. Kaolin is utilized to synthesizing a fluoride sorbent carrier that is of porous characteristics similar to molecular sieve .The defluoridation material can be obtained by loading Fe³⁺ on the skeleton of the material. By the complexation of Fe³⁺ and F, F can be removed from high fluorine containing water. The research work is divided two parts. First kaolin was served as row material synthesizing a fluoride sorbent carrier. The conditions are found in the experiment after kaolin fluoride sorbent carrier modified , The experimental result indicated: kaolin is calcined and become the amorphous thing attitude in 600℃;when the concentration of NaOH is 10% and the proportion is 20:1 of the volume of NaOH and activating kaolin powder, the kaolin can be dissolved fully after a hour;then kaolin is crystallized 80 ℃ after 4 hours.A carrier of fluoride sorbent can be abtained by separating the solid from the liquid.On the other hand, the carrier of fluoride sorbent is of porous structure and can be modified . The defluoridation material can be obtained by loading Fe³⁺ on the skeleton of the material. By the complexation of Fe³⁺ and F, F" can be removed from high fluorine containing water. In this paper,defluoridation by kaolin sorbent is studied experimentally using static and continous flow column, the defluoridation effect of the defluoridation material under different conditions are discussed in ditail, such as defluoridation condition , disturbing condition as well as some elementary technology condition, the main conclusions...