Aluminum-based compound fluorine removal agent and preparation method thereof

Abstract

The invention discloses an aluminum-based compound fluorine removal agent and a preparation method thereof, the aluminum-based compound fluorine removal agent is mainly composed of an aluminum dry base, specially-made hydroxyapatite powder and a modifier, and the aluminum dry base comprises polyaluminum chloride, aluminum sulfate, magnesium oxide and other components; the modifier comprises one or two components of rare earth element oxides (lanthanum oxide and cerium oxide); the hydroxyapatite powder is prepared by the process steps provided by the invention. Defluorination of the aluminum-based compound fluorine removal agent belongs to the synergistic principle of flocculation, complexation, coprecipitation, ion exchange and the like, and the aluminum-based compound fluorine removal agent has high selectivity and anti-interference performance and is suitable for fluorine removal through a large-water-amount and low-concentration fluorine ion agent addition method. The agent is low in adding treatment cost, the fluorine removal effect reaches 76.25% or above, the fluorine content of effluent is smaller than 1.0 mg / L, and the requirements of class-III limit values in Environmental Quality Standards for Surface Water are met.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a preparation method of a defluorinating agent, in particular to an aluminum-based compound defluorinating agent and a preparation method thereof. Background technique [0002] Fluorine is one of the trace elements needed by the human body to maintain normal physiological activities, but excessive intake of fluorine from the outside world will affect health. my country has strict requirements on the fluorine content in drinking water and the discharge of fluorine-containing wastewater. The "Drinking Water Sanitation Standard" (GB5749-2006) stipulates that the fluorine content in drinking water should be less than 1.0mg / L, and the fluoride content of drinking water sources should be less than 1.0 mg / L. The discharge shall comply with Class III of the Environmental Quality Standard for Surface Water (GB3838-2002), that is, the fluorine content shall be less than 1.0mg...

AI Technical Summary

Problems solved by technology

Among them, the coagulation-sedimentation method is mainly used in the purification process of suspended solids, and the fluoride removal effect is limited, and the fluorine content of the effluent cannot be guaranteed to be less than 1.0mg / L, so it is only suitable for use in small and medium-scale wastewater treatment; the adsorption filtration method requires high adsorption capacity Adsorbents and targeted regenerants, the materials on the market are mixed, it is difficult to choose, and this method is only suitable for use in small-scale wastewater treatment, and has high requirements for operation; although the ion exchange method and membrane treatment method have high fluoride removal efficiency , but the relatively high cost limits the use of

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