Fluorine removal agent for water treatment, preparation method and use method thereof

Abstract

The invention discloses a fluorine removal agent for water treatment. The fluorine removal agent comprises the following raw materials: calcium salt, polymeric aluminum salt, polymeric ferric salt, magnesium salt, copper salt, sodium iminodisuccinate, and the like. According to the invention, formula composition and dosage are screened, so that the fluorine removal agent has the advantages of various compound raw materials at the aspect of fluorine removal and is capable of eliminating defects of all the raw materials at the aspect of defluorination; defluorination effect and drug performanceof the acquired fluorine removal agent are both obviously improved; the fluorine removal agent has high selectivity and removal rate for fluorine ions in wastewater; the fluorine removal agent can beused for extensive fluoride-containing wastewater; after treatment, water is quickly and stably discharged and is free from secondary pollution; the fluorine removal agent product has the advantages of drug performance stability and convenience in use and has a bright market prospect in industrial wastewater defluorination. Besides, the fluorine removal agent provided by the invention is simple inpreparation method, is safe and stable in technology, is convenient for mass production and has obvious economic benefit.

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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