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

A technology of fly ash and fluorine materials, which is applied in the field of fly ash-based porous fluoride removal materials and its preparation, can solve problems such as low strength, high energy consumption, and complicated procedures, and achieve high strength, large specific surface area, and source of raw materials wide range of effects

Active Publication Date: 2020-05-08
国能朗新明环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A fly ash-based porous defluoridation material, raw materials include: 30 parts of fly ash, 30 parts of calcined coal gangue, 2 parts of bone char, 3 parts of hydrotalcite, 0.1 part of calcium stearate, 100 parts of water glass, and 1 part of hydrogen peroxide .

[0040] The chemical composition of fly ash is calculated as: SiO 2 30%, Al 2 o 3 18%, Fe 2 o 3 5%, CaO 38%, MgO2.8%, SO 3 2.1%, other 4.1%.

[0041] The chemical composition of calcined coal gangue is calculated by mass fraction: SiO 2 51%, Al 2 o 3 33%, Fe 2 o 3 8.5%, CaO1.7%, MgO1.5%, TiO 2 1.4%, others 2.9%.

[0042] A preparation method of a fly ash-based porous defluoridation material, comprising the following steps:

[0043] (1) Take 30 parts of fly ash that has been ground to 180-220 mesh, 30 parts of calcined coal gangue, 2 parts of bone char, 3 parts of hydrotalcite, 0.1 part of calcium stearate and mix evenly, then add it to 100 parts of water glass, The modulus of water glass i...

Embodiment 2

[0048] A fly ash-based porous material for removing fluorine, comprising: 40 parts of fly ash, 50 parts of calcined coal gangue, 3 parts of bone char, 5 parts of hydrotalcite, 0.2 part of calcium stearate, 150 parts of water glass and 1.5 parts of hydrogen peroxide.

[0049] Chemical composition of fly ash in mass fraction: SiO 2 35%, Al 2 o 3 15%, Fe 2 o 3 6%, CaO 35%, MgO2.3%, SO 3 1.8%, other 4.9%.

[0050] The chemical composition of calcined coal gangue in mass fraction: SiO 2 46%, Al 2 o 3 40%, Fe 2 o 3 5.5%, CaO2.4%, MgO1.5%, TiO 2 1.4%, others 3.2%.

[0051] A preparation method of a fly ash-based porous defluoridation material, comprising the following steps:

[0052] (1) Take 40 parts of fly ash that has been ground to 180-220 mesh, 50 parts of calcined coal gangue, 3 parts of bone char, 5 parts of hydrotalcite, and 0.2 part of calcium stearate and mix evenly, then add it to 150 parts of water glass, The modulus of water glass is 2.2, SiO in wate...

Embodiment 3

[0057] A fly ash-based porous material for removing fluorine, the raw materials include: 20 parts of fly ash, 50 parts of calcined coal gangue, 5 parts of bone char, 0.1 part of calcium stearate, 75 parts of water glass and 1 part of hydrogen peroxide.

[0058] Chemical composition of fly ash in mass fraction: SiO 2 41%, Al 2 o 3 15%, Fe 2 o 3 6.5%, CaO 28%, MgO 2.8%, SO 3 2.1% and others 4.6%.

[0059] The chemical composition of calcined coal gangue in mass fraction: SiO 2 48%, Al 2 o 3 40%, Fe 2 o 3 2.5%, CaO 1.8%, MgO 1.6%, TiO 2 1.5% and others 4.6%.

[0060] A preparation method of a fly ash-based porous defluoridation material, comprising the following steps:

[0061] (1) Take 20 parts of fly ash that has been ground to 220-300 mesh, 50 parts of calcined coal gangue, 5 parts of bone charcoal, and 0.1 part of calcium stearate and mix evenly, then add it to 75 parts of water glass, the modulus of water glass 2.0, SiO in water glass 2 The massfraction of is 1...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B38/02C04B111/40
CPCC04B28/26C04B2111/00017C04B2111/00025C04B2111/40C04B18/08C04B18/02C04B14/022C04B22/06C04B24/085C04B22/068C04B38/02
Inventor 苏双青赵焰徐志清陆梦楠杨燕陈雪陈文婷孙斌腾东玉
Owner 国能朗新明环保科技有限公司
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