Fluoride is one of the essential trace elements in human body, but the fluorine content of people's daily drinking water is generally controlled at 0.4-0.6mg/L. Drinking water with a fluoride ion concentration greater than lmg/L for a long time is unfavorable to the human body, causing severe dental fluorosis. With skeletal fluorosis and other diseases, it can even induce tumors, which are a serious threat to human health. Fluorite crisp, easily clay of the grinding process; the same time, fluorspar flotation process in the flotation reagent is added oleic acid, soda ash and the like, in particular sodium silicate, sodium phosphate partial adjustment agents and the like, dispersed in water from The effect is that the tailings water contains a large amount of colloidal suspended matter, and the colloidal suspension is difficult to settle, causing the fluorine and suspended matter in the tailing water to seriously exceed the standard. When the tailings water is directly reused, it will affect the beneficiation process, and external discharge will cause serious pollution to the surrounding waters. In addition, some small fluorite concentrators sell high-grade calcium fluoride dust due to the sale of dry concentrates. For example, the total fluorine emission concentration generated by a drying process is 143.2mg/m3, after total dust removal treatment. The fluorine emission concentration is still as high as 14.3 mg/m3. There are several treatment methods for high-concentration fluorine-containing wastewater at home and abroad. The common treatment methods for inorganic fluorine-containing wastewater are: precipitation method is mainly applied to the treatment of industrial fluorine-containing wastewater; adsorption method is mainly used for treatment of drinking water; other methods include freezing method. , ion exchange method, ultrafiltration defluoridation method, electrocoagulation method, electrodialysis, reverse osmosis technology. The ore dressing fluorine-containing wastewater can be treated by chemical precipitation method and coagulation sedimentation method. Generally, a calcium salt precipitation method in which lime is precipitated can be used, that is, by adding a calcium salt or the like to a waste water to cause a calcium ion to react with a fluoride ion to form a CaF2 precipitate, thereby achieving the purpose of removing the F- in the waste water. The fluorine removal effect can reach 84% to 97%. If fluorine are required, the added again on the basis of the calcium salt, magnesium plus aluminum salts, phosphates, magnesium hydroxide, magnesium salt formation precipitate achieve adsorption of fluoride, hydroxide in the coagulation process aluminum reacts with fluoride ions producing aluminum fluoride complex, aluminum fluoride complexes are produced by precipitation and adsorption flower alum hydroxide, calcium chloride may be added additionally, the iron complex salt and a high molecular coagulant and PAM As a flocculant to improve the fluorine removal effect. The coagulation sedimentation method adds two kinds of coagulants, iron salt and aluminum salt, into the water to form positively charged rubber particles in the water. The rubber particles can absorb the FL in the water and merge with each other to form a floc precipitate to achieve the removal. The purpose of fluorine. When Ca(OH)2 is added, the complexation of A13+ with F- and the Al(OH)3矾 flower produced by hydrolysis of aluminum salt are used to remove F- in wastewater; if aluminum salt is added, Al3+ and F- form A1Fx(3-x)+, the inclusions are precipitated in Al(OH)3am. Metal Tealight Holder,Metal Wall Tealight Holder,Metal Tealight Candle Holders,Metal Hanging Tea Light Holders Hangzhou Freefish Import & Export Co., Ltd. , https://www.fltdframe.com