Fly ash-based porous defluorination material as well as preparation method and application thereof

Abstract

The invention discloses a fly ash-based porous defluorination material as well as a preparation method and application thereof. The porous defluorination material comprises the raw materials by weight: 20-40 parts of fly ash, 20-50 parts of calcined coal gangue, 0-20 parts of a fluorine ion adsorbent, 50-200 parts of water glass, 1-3 parts of a foaming agent and 0.1-0.2 part of a foam stabilizer.The preparation method of the fly ash-based porous defluorination material comprises the steps: a raw material mixing step: uniformly mixing fly ash, calcined coal gangue, the fluorine ion adsorbent and the foam stabilizer according to the ratio, and then adding the mixture into water glass to obtain a mixed material; a stirring step: stirring the mixed material for the first time, then adding hydrogen peroxide, and stirring for the second time to obtain mixed slurry; and a molding and curing step: carrying out molding treatment on the mixed slurry, and then curing to obtain the fly ash-basedporous defluorination material. The preparation method provided by the invention can achieve the purpose of treating waste with waste, and has an excellent defluorination effect.

Description

technical field [0001] The invention belongs to the field of waste water 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 fluorine content will cause changes in bone structure, cause bone fluorosis and dental fluorosis and other poisoning symptoms, and bring great harm to human and animal health. [0003] At present, the main methods for removing fluorine are: coagulation precipitation, electrocoagulation, electrodialysis, reverse osmosis, adsorption and ion exchange. The coagulation precipitation method generally adds calcium oxide / hydroxide or calcium salt, and a coagulant to the water to form a precipitate. This method is suitable for water...

AI Technical Summary

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