Improved fluorine removal agent

Abstract

The invention discloses an improved fluorine removal agent, and a preparation method and a use method thereof. The fluorine removal agent comprises ferrous sulfate, nonferrous alumina, water and a polymeric flocculant. The preparation method comprises the following steps: S1, putting ferrous sulfate, nonferrous alumina and water into a reaction kettle, heating the reaction kettle, and performing stirring to achieve complete dissolving in order to obtain a mixture; S2, taking and adding the polymeric flocculant into the mixture obtained in step S1; and S3, performing mixing and stirring, and adjusting the pH value of the obtained mixture to 3 with an acidic pH regulator after complete cooling is performed in order to obtain the improved fluorine removal agent. The use method comprises the following steps: S1, detecting the fluorine ion concentration of to-be-treated water; S2, adding the improved fluorine removal agent according to the detection result of the fluorine ion concentrationof the to-be-treated water; S3, controlling the pH value of the to-be-treated water to be 6.5-7.0; and S4, carrying out a standing reaction on the treated water obtained after the addition of the improved fluorine removal agent for 30 min or above. The improved fluorine removal agent prepared by the preparation method has a good fluorine removal effect after the use steps.

Description

technical field [0001] The invention relates to the technical field of water treatment chemicals, in particular to an improved defluoridation agent for water treatment. Background technique [0002] Fluorine is a trace element that widely exists in nature and is also one of the essential trace elements for the human body. The mass concentration of fluorine is too high or too low to cause harmful effects on human health. Therefore, according to the "Drinking Water Hygienic Standard" (GB 5749-2006), the mass concentration of fluorine in drinking water should be 0.5-1.0mg / L. In recent years, excessive fluorine content in groundwater in Xinjiang region has caused various fluoride diseases in human body in some areas, which has aroused people's research on groundwater defluoridation technology. So far, fluoride removal methods can be roughly divided into the following categories: including electrodialysis, precipitation, ion exchange, membrane filtration technology and adsorptio...

AI Technical Summary

Problems solved by technology

However, the treatment effect of traditional calcium-based materials is not ideal, the adsorption capacity is low, and it takes a long time to remove fluoride, so it is difficult to meet the national drinking water standards. With the further stringent environmental protection indicators and the upcoming fluoride ion emission standards, Conventional calcium defluoridation has been unable to meet the requirements

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