Process for synthesizing single-phase sodalite from fly ash

A technology of fly ash and single-phase square, which is applied in the field of production and preparation of inorganic functional materials, achieving the effect of wide synthesis conditions, good reproducibility, and high cost
CN102173433AActive Publication Date: 2011-09-07NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2011-09-07

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Abstract

The invention belongs to the field of production and preparation of inorganic functional materials, and particularly relates to a process for preparing single-phase sodalite from fly ash, which comprises the following steps: pretreating fly ash by an alkaline fusion method; proportionally adding the activated fly ash, aluminum hydroxide and sodium hydroxide solution into a polytetrafluoroethyleneinner container, evenly mixing, and carrying out hydrothermal crystallization in a sealed constant-temperature drying oven; and finally, filtering the product, washing until the product becomes neutral, and drying to obtain the single-phase sodalite material. The invention successfully synthesizes the low-cost single-phase sodalite zeolitization material by using solid waste-fly ash as the raw material for production. The process has the advantages of low cost, abundant sources of raw material, controllable product performance, no secondary pollution and the like, is simple and easy to operate, and thus, has great industrial application potential.
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Description

technical field

[0001] The invention belongs to the field of production and preparation of inorganic functional materials, and relates to a method for preparing single-phase sodalite from fly ash as a raw material. Background technique

[0002] Sodalite is a kind of porous aluminosilicate zeolite with small pore size. Due to its unique spatial structure and physical and chemical properties, it is widely used as adsorbent, hydrogen storage material and photochromic material. At present, the synthesis of sodalite mainly uses chemical raw materials containing aluminum or silicon, sodium hydroxide and water as raw materials, and is hydrothermally synthesized at a certain temperature using the autogenous pressure of water. The sodalite synthesized by this method has the advantages of high purity and good quality, but the high cost seriously restricts its production volume and application field.

[0003] Fly ash is mainly solid waste generated in the production process of coal-fi...

Claims

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