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Modified fly ash ceramsite and preparation method and application thereof

A technology of fly ash ceramsite and fly ash, which is applied in the field of modified fly ash ceramsite and its preparation, can solve the problems of poor pollutant removal effect and poor selectivity, and achieve suitable conditions for large-scale industrial promotion. Gentle, process-friendly effect

Inactive Publication Date: 2017-07-04
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many documents on the use of fly ash ceramsite as filler in water treatment, most of them use fly ash ceramsite directly as filler to treat sewage, and the removal effect of pollutants is not good and the selectivity is poor.

Method used

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  • Modified fly ash ceramsite and preparation method and application thereof
  • Modified fly ash ceramsite and preparation method and application thereof
  • Modified fly ash ceramsite and preparation method and application thereof

Examples

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preparation example Construction

[0027] The invention provides a kind of preparation method of modified fly ash ceramsite, comprises the following steps:

[0028] (1) Fly ash, pore forming agent and water are mixed, and granulated into balls to obtain mixed pellets;

[0029] (2) sintering the mixed pellets obtained in the step (1) to obtain fly ash ceramsite;

[0030] (3) Soak the fly ash ceramsite obtained in the step (2) with an inorganic acid solution to obtain a modified fly ash ceramsite precursor;

[0031] (4) Roasting the modified fly ash ceramsite precursor obtained in the step (3) to obtain the modified fly ash ceramsite.

[0032] The invention mixes the fly ash, the pore-forming agent and water, forms balls and granulates to obtain the mixed pellets. In the present invention, the mass ratio of the fly ash, pore forming agent and water is preferably 0.6-0.9:0.05-0.3:1, more preferably 0.7-0.8:0.1-0.2:1. In the present invention, the particle size of the fly ash is preferably above 100 mesh, more p...

Embodiment 1

[0046] figure 1 It is a flow chart for the preparation of modified fly ash ceramsite in this embodiment. As can be seen from the figure, the preparation steps of modified fly ash ceramsite in this embodiment include: basic formula design, raw material weighing, mixing Material, granulation, low-temperature drying, sintering, cooling, sulfuric acid modification and secondary roasting, the specific preparation method is as follows:

[0047] 100 mesh fly ash, pore forming agent and water are mixed according to the mass ratio of 6:3:10, and pelletized to obtain a mixed ball material with a particle size of 5mm;

[0048] Dry the mixed pellets in a drying oven at 40°C for 48 hours, and sinter at 960°C for 60 minutes to obtain fly ash ceramsite;

[0049] The fly ash ceramsite is soaked with 2mol / L sulfuric acid solution for 24h to obtain the modified fly ash ceramsite precursor;

[0050] The modified fly ash ceramsite precursor was calcined at 500° C. for 3 hours to obtain the modi...

Embodiment 2

[0053] 200 mesh fly ash, pore forming agent and water are mixed according to the mass ratio of 20:3:10, and pelletized to obtain a mixed ball material with a particle size of 5mm;

[0054] Dry the mixed pellets in a drying oven at 50°C for 24 hours, and sinter at 1140°C for 10 minutes to obtain fly ash ceramsite;

[0055] The fly ash ceramsite is soaked with 3mol / L sulfuric acid solution for 20h to obtain the modified fly ash ceramsite precursor;

[0056] The modified fly ash ceramsite precursor was calcined at 600° C. for 2 hours to obtain the modified fly ash ceramsite.

[0057] The volume of pores in the modified fly ash prepared in this example is 43.49% of the volume of the modified fly ash ceramsite. The SEM photo of the modified fly ash ceramsite prepared in the present embodiment is as follows image 3 shown.

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Abstract

The invention provides modified fly ash ceramsite and a preparation method and an application thereof. Fly ash, a pore forming agent and water are mixed, the mixture is subjected to ball formation and granulation and then is sintered to obtain the fly ash ceramsite having a mullite and glass phase structure, and the mechanical properties of the fly ash ceramsite product are improved; then the fly ash ceramsite is soaked by an inorganic acid solution and is subjected to acid modification, closed pores on the surface of the ceramsite in the sintering process are opened through acidification, and at the same time, active adsorption centers of the fly ash ceramsite are increased; finally, after roasting, modified ions are fixed and attached to the fly ash ceramsite pores and surface, so the product has an effect on removing specific contaminants, especially ammonia-nitrogen wastewater. Experimental results show that after the ammonia-nitrogen wastewater is treated for 3 h by the modified fly ash ceramsite provided by the invention, the ammonia-nitrogen removal rate can reach 81.66%; and compared with ordinary fly ash ceramsite, the modified fly ash ceramsite has the ammonia-nitrogen removal rate increased by 57.7%.

Description

technical field [0001] The invention relates to the technical field of environmental protection materials, in particular to a modified fly ash ceramsite and its preparation method and application. Background technique [0002] With the rapid development of the national economy, the acceleration of industrialization and the improvement of people's living standards, the contradiction between the amount of water required by industry and the people and the lack of water resources has intensified. my country's water resources are insufficient, the per capita is less than 1 / 3 of the world level, and the water pollution is becoming more and more serious. Therefore, the development and use of efficient ammonia nitrogen sewage treatment technology has become a hot spot of national concern. [0003] Traditional water treatment methods mainly include chemical precipitation, physical adsorption, flocculation, filtration, catalytic degradation and microbial decomposition. Among them, ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/135C04B35/185C04B41/91C02F1/28
CPCC02F1/281C04B33/1328C04B33/1352C04B35/185C04B38/009C04B41/5353C04B41/91C04B38/0074C04B38/068C04B38/0645C04B38/0675Y02P40/60
Inventor 杨艳茹白庆伟麻永林吴锦绣王军乔伟超
Owner INNER MONGOLIA UNIV OF SCI & TECH
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