A kind of fly ash-based porous defluoridation material and its preparation method and application

Abstract

The invention discloses a fly ash-based porous material for removing fluorine, a preparation method and application thereof. By weight, the raw materials of the porous defluorination material include: 20-40 parts of fly ash, 20-50 parts of calcined coal gangue, fluoride ion adsorbent, 50-200 parts of water glass, 1-3 parts of foaming agent, Foam stabilizer 0.1-0.2 parts. The preparation method of the fly ash-based porous fluorine-removing material includes a raw material mixing step: mixing fly ash, calcined coal gangue, fluoride ion adsorbent, and foam stabilizer evenly according to the proportion, and then adding them to water glass to obtain a mixture Stirring step: the mixed material is stirred for the first time, then hydrogen peroxide is added, and the second stirring is carried out to obtain the mixed slurry; the forming maintenance step: the mixed slurry is subjected to molding treatment, and then maintained to obtain The fly ash-based porous fluoride removal material. The preparation method of the invention can achieve the purpose of using waste to make waste, and has excellent fluorine removal effect.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a fly ash-based porous defluorination material and a preparation method and application thereof. Background technique [0002] Fluorine is one of the essential trace elements for human life. An appropriate amount of fluorine can strengthen bones and teeth and reduce the incidence of dental caries. However, long-term use of water with excessive fluoride content will cause changes in bone structure and cause other poisoning symptoms such as bone fluorosis and dental fluorosis, which will bring great harm to human and animal health. [0003] At present, the main fluorine removal methods are: coagulation precipitation, electrocoagulation, electrodialysis, reverse osmosis, adsorption method and ion exchange method. The coagulation precipitation method generally adds calcium oxides / hydroxides or calcium salts and coagulants to the water to form precipitation. This metho...

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Problems solved by technology

[0004] Invention patent 201410196750.0 discloses a defluoridation agent prepared from fly ash, which is composed of fly ash after acid leaching, mechanically mixed with activated carbon, loam and zero-valent iron powder, and has low strength

Invention patent application 201810219086.5 discloses a fly ash and clay as raw materials, which are sintered into ceramsite at 950-1150°C, and then soaked in acid, alkali or salt solution to obtain a fly ash defluorination agent. However, the powder Coal ash defluoridation agent requires high temperature calcination, high energy consumption, post-treatment is required after firing ceramsite, and the process is more complicated