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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, to achieve the effect of solving high cost, single component and wide synthesis conditions

Active Publication Date: 2013-06-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method for synthesizing single-phase sodalite by using whole fly ash in the prior art

Method used

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  • Process for synthesizing single-phase sodalite from fly ash
  • Process for synthesizing single-phase sodalite from fly ash
  • Process for synthesizing single-phase sodalite from fly ash

Examples

Experimental program
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Effect test

preparation example Construction

[0025] Preparation of activated fly ash:

[0026] No. 1 activated fly ash: mix the fly ash and sodium hydroxide according to 1:2 and put it in the muffle furnace, and mix it with 10 o C / min heating rate increased to 600 o C, keep it warm for 4 hours, then cool down to room temperature at the same rate, and get No. 1 activated fly ash after grinding.

[0027] No. 2 activated fly ash: mix the fly ash and sodium hydroxide according to 1:1 and put it in the muffle furnace, and mix it with 5 o C / min heating rate increased to 700 o C, keep warm for 3 hours, then cool down to room temperature at the same rate, and get No. 2 activated fly ash after grinding.

[0028] No. 3 activated fly ash: mix the fly ash and sodium hydroxide according to 3:2 and put them in the muffle furnace, and use 2 o C / min heating rate increased to 800 o C, keep it warm for 2 hours, then cool down to room temperature at the same rate, and get No. 3 activated fly ash after grinding.

Embodiment 1

[0030] 4 g of No. 1 activated fly ash, Al(OH) 3 0.4 g and 5 mol / L NaOH 60 mL were sequentially added into the polytetrafluoroethylene liner, mixed evenly, sealed and placed in 100 o C in an electric constant temperature drying oven for 24 h, the crystallized product was repeatedly filtered, washed until neutral, and dried to obtain a single-phase sodalite material. Depend on figure 1 It can be seen that there is only one zeolite phase, sodalite, in the synthesized product, and the crystallinity is relatively high.

Embodiment 2

[0032] 4 g of No. 1 activated fly ash, Al(OH) 3 0.8 g and 5 mol / L NaOH 60 mL were sequentially added into the polytetrafluoroethylene liner, mixed evenly, sealed and placed in 100 o C in an electric constant temperature drying oven for 24 h, the crystallized product was repeatedly filtered, washed until neutral, and dried to obtain a single-phase sodalite material. Depend on figure 1 It can be seen that there is only one zeolite phase, sodalite, in the synthesized product, and the crystallinity is relatively high.

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02B09B3/00
Inventor 王连军于洪霞李健生孙秀云韩卫清沈锦优刘晓东
Owner NANJING UNIV OF SCI & TECH
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