Defluorinating agent for water treatment and preparation method and use method thereof

Abstract

The invention discloses a defluoridation agent for water treatment, which comprises calcium salt, polyaluminum salt, polyiron salt, magnesium salt, copper salt, iminodisuccinic acid sodium salt and other raw material components. Through the screening of formula composition and dosage, the present invention not only combines the advantages of each compound raw material in defluoridation, eliminates the disadvantages of each raw material in the application of fluorine removal, but also obtains a defluoridation agent in terms of fluoride removal effect and medicament The performance has been significantly improved. It has high selectivity and high removal rate for fluoride ions in wastewater, and it is widely used in fluorine-containing wastewater. After treatment, the effluent is fast, stable, and free from secondary pollution. It has the advantages of stable chemical performance and easy use, and has broad market prospects in the application of defluoridation of industrial wastewater. In addition, the defluoridation agent of the present invention has simple preparation method, safe and stable process, is convenient for large-scale production, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to the technical field of water treatment agents, in particular to a defluorinating agent for water treatment, a preparation method and a using method of the defluorinating agent. Background technique [0002] Fluorine is one of the trace elements needed by the human body to maintain normal physiological activities. The fluorine needed by the human body mainly comes from drinking water. However, if humans drink water with excessive fluorine content for a long time, fluorosis will occur, causing dental fluorosis, skeletal fluorosis, etc. A series of diseases can even cause damage to human brain nerves in severe cases. Therefore, my country stipulates that the fluorine content in drinking water is 0.5-1.0 mg / L, and strictly controls the fluorine content in discharged water. [0003] The treatment of fluorine-containing wastewater generally uses defluoride agents. Existing defluoride agents include calcium salts, aluminum salts, magne...

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Problems solved by technology

[0003] The treatment of fluorine-containing wastewater generally uses defluoride agents. Existing defluoride agents include calcium salts, aluminum salts, magnesium salts, iron salts, etc. Calcium salts use calcium-containing materials to convert F - in CaF 2 It is removed in the form of precipitation, although it has a certain defluoridation effect, but CaF 2 It belongs to colloidal precipitation, and its poor filtration performance will prolong the treatment time and affect the water treatment efficiency; although the aluminum salt has a good defluoridation effect, its usage is large, which not only leads to high operating costs for enterprises, but also high pressure on environmental protection; magnesium Salt uses the coagulation and precipitation of magnesium to remove fluorine. It has been widely used in sewage treatment, drinking water purification, electrolytic zinc, etc. However, the goethite method needs to add a large amount of iron-containing raw materials, which will undoubtedly increase the burden of iron precipitation in the subsequent process, and the concentration of fluoride ions in the solution after defluorination is still high

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