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Method for preparing nano analcime with fly ash

A technology of fly ash and analcime, applied in nanotechnology, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as crystallinity needs to be improved

Inactive Publication Date: 2013-04-17
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the zeolites synthesized by hydrothermal synthesis mainly include A, X, Y, P, HS, ZSM, etc., but the crystallinity needs to be improved.

Method used

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  • Method for preparing nano analcime with fly ash
  • Method for preparing nano analcime with fly ash
  • Method for preparing nano analcime with fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix fly ash and sodium hydroxide, the mass ratio of sodium hydroxide and fly ash is 1.1:1, activate and roast at a high temperature of 500°C for 2 hours, after cooling, add deionized water, stir at 45°C for 3 hours, and then Stir for 7 hours; filter and dry the mixed solution after sonication for 1 hour; add 1 ml of sodium hydroxide solution with a hydroxide ion solubility of 5.5 mol / liter per 1 gram of solid, stir and sonicate for 4 hours Finally, put it in a stainless steel reaction kettle lined with polytetrafluoroethylene, at a temperature of 100 ° C, after hydrothermal crystallization for 12 hours, take out the product, filter, wash, dry, and grind to obtain a single crystal without other impurities Nanoanalcites prepared from fly ash.

Embodiment 2

[0028] Pretreat the fly ash in sulfuric acid solution, stir at 30°C for 2 hours, filter and dry, mix the pretreated fly ash with sodium carbonate, the mass ratio of sodium carbonate to fly ash is 1.8:1 , fired at a high temperature of 850°C for 1 hour, after cooling, added deionized water, stirred at 35°C for 7 hours, and then stirred at room temperature for 0.5 hour; the mixture was ultrasonically treated at 25 kHz frequency and 1000 watts for 5 minutes, then filtered and dried; Add 15 milliliters of potassium hydroxide solution with a hydroxide ion solubility of 0.3 mol / liter per 1 gram of solid to the dried solid, stir, 40 kilohertz frequency and 300 watts of ultrasonic power for 1 hour, and place the In a stainless steel reaction kettle of vinyl fluoride, at a temperature of 40°C, after hydrothermal crystallization for 96 hours, the product is taken out, filtered, washed, dried, and ground to obtain a single nano-square prepared from fly ash without other miscellaneous crys...

Embodiment 3

[0030] Pretreat the fly ash in hydrochloric acid solution, stir at 50°C for 1.5 hours, filter and dry, mix the pretreated fly ash with potassium hydroxide, the mass ratio of potassium hydroxide to fly ash is 1.5 : 1. Excited and roasted at a high temperature of 600°C for 1.8 hours. After cooling, add deionized water, stir at 100°C for 0.5 hours, and then stir at room temperature for 3 hours; Drying; add 3 ml of sodium hydroxide and potassium hydroxide mixed solution with a hydroxide ion solubility of 0.8 mol / liter per 1 gram of solid, and the mass ratio of sodium hydroxide and potassium hydroxide is 1:1 , stirring, 50 kHz frequency and 600 watt power ultrasonic for 5 minutes, placed in a stainless steel reactor lined with polytetrafluoroethylene, at a temperature of 50 ° C, after hydrothermal crystallization for 30 hours, the product was taken out, filtered, washed, After drying and grinding, a single nano analcime prepared from fly ash without other miscellaneous crystals can...

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Abstract

The invention provides a method for preparing nano analcime with fly ash. The method comprises the steps that 1), the fly ash and alkali are mixed and roasted at a high temperature; 2), deionized water is added after cooling; heating stirring and room temperature stirring are combined; collosol is obtained; 3), the collosol is subjected to ultrasonic treatment and filtering after the stirring; 4), filtered solid is added to an alkaline solution, and hydrothermal crystallization is conducted at a lower temperature; and 5), filtering, washing and drying are conducted after the crystallization, and powdered nano analcime is obtained. Compared with the prior art, the method has the following advantages that 1, fly-ash monocrystal nano analcime with fewer reserves in nature is synthesized by taking the fly ash as a raw material; 2, other silicon and aluminium sources and template agents are not added; and 3, the nano fly ash analcime is synthesized by a simple technology through the hydrothermal crystallization at a low temperature (not exceeding 100 DEG C). The method utilizes the waste fly ash to achieve resource utilization of the fly ash, synthesizes the analcime with fewer resources, and can be applied to fluorine, cesium and heavy metal waste water treatment.

Description

technical field [0001] The invention belongs to the field of synthesis of nanometer materials, and in particular relates to a method for preparing nanometer analcime with fly ash. Background technique [0002] Analcite (ANA) is one of the zeolite minerals, and it is an emerging mineral resource that has been paid more attention at home and abroad in recent years. However, analcime has less natural reserves and is only produced in a few countries such as the United States and Japan. In 1998, a large-scale analcite mine was discovered in Wushen Banner, Inner Mongolia, with a storage capacity of more than several thousand tons and analcite content of about 38% to 81%. The discovery of analcime in Wushen Banner filled the blank of natural analcime mine in my country. The effective pore diameter of natural analcime is about 0.26 nanometers. It can be made into natural ion sieve or natural microporous adsorbent, which can be used for water purification and contaminated soil rest...

Claims

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Application Information

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IPC IPC(8): C30B7/10C30B29/34C01B39/02B82Y30/00
Inventor 邹丽霞耿彦霞范培培
Owner EAST CHINA UNIV OF TECH
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