Efficient defluorination compound chemical

Abstract

The invention discloses an efficient defluorination compound chemical and a method for treating fluoride waste water by using the same. The efficient defluorination compound chemical comprises, by weight, 50%-64% of polymeric aluminum, 3%-8% of magnesium chloride, 8%-13% of calcium chloride, 10%-13% of polymeric aluminum ferric chloride and 0.5%-2% of dimethyl diallyl ammonium chloride. By compounding the materials to prepare a liquid chemical and adding the liquid chemical into the fluoride waste water proportionally, complexation, agglomeration and absorption of fluorine ions are completed by mechanical stirring, the purpose of efficient defluorination is realized, and the efficient defluorination compound chemical has the advantages of simplicity in chemical application, high defluorination efficiency, low treating cost, wide application range and the like.

Description

technical field [0001] The invention relates to the field of fluorine-containing wastewater treatment, in particular to a compound agent for highly efficient fluorine removal. Background technique [0002] Fluorine is one of the essential trace elements for the human body. Trace amounts of fluorine can promote the growth and development of children and prevent dental caries. The daily intake of fluoride for adults is generally 1.0-1.5mg / L, and excessive intake will endanger health. my country's "Drinking Water Hygienic Standard" stipulates that the maximum allowable concentration of fluorine is 1.0mg / L. It is reported that tens of millions of people in my country drink water with excessive fluoride, and endemic fluorosis symptoms such as dental fluorosis are very common in many areas. In industry, the wastewater discharged from the coal chemical industry, semiconductor manufacturing industry, solar panel industry, electroplating industry, coal mining industry, alumina smelti...

AI Technical Summary

Problems solved by technology

The calcium salt precipitation method mainly adds lime to the wastewater to make the fluoride ion and calcium ion generate CaF 2 This process has the advantages of simple method, convenient treatment, and low cost, but it is difficult to reach the standard after treatment (the fluorine content in wastewater treated with lime is generally not lower than 20-30mg / L), sludge Slow sedimentation and difficult dehydration and other disadvantages; the adsorption method mainly includes activated alumina, bone char, calcium hydroxyphosphate, zeolite, volcanic rock, etc. The commonly used activated alumina has low adsorption capacity, generally only 5-8mg / g, and is easy to Therefore, the adsorption method needs to use an adsorbent with high selectivity and high adsorption capacity. If the adsorption capacity of the adsorbent is low, frequent regeneration is required, especially when the fluorine concentration in the raw water is high, and the general adsorption technology exists (strongly alkaline ) Disposal of recycled waste liquid; coagulation defluorination agents mainly include inorganic salt coagulants such as polyaluminum ferric chloride, aluminum chloride, and basic aluminum chloride. At present, single Coagulant, such as polyaluminum ferric chloride, but the dosage of polyaluminum ferric chloride is too large, and the treatment effect is not good, and the pH index of the effluent is low

For example: the publication number is CN104496063A "a method for removing fluoride from wastewater", but this method has incomplete precipitation reaction, large coagulant dosage, and the highest fluoride ion concentration is 500mg / L.

Because a single coagulation defluoridation agent has disadvantages such as large dosage, high sludge production, single and unstable effect, the current compound coagulation and defluorination agent is a coagulation and defluorination agent that can give full play to the characteristics of each agent. Avoiding the disadvantages of a single agent such as single effect and unstable effect, it is expected to achieve complementary or synergistic advantages, realize enhanced coagulation, and improve the removal efficiency of fluoride, which has attracted more and more attention.

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