Technique for hydro-thermal synthesis of high purity zeolite and fly ash zeolite adsorbing agent from fly ash

A technology for fly ash zeolite and hydrothermal synthesis, which is applied in the directions of crystalline aluminosilicate zeolite, chemical instruments and methods, other chemical processes, etc., can solve the problems of low utilization rate of fly ash, etc. simple effect

Inactive Publication Date: 2009-08-12
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the discharged fly ash, less than 1 / 2 of the fly ash is used for low value-added applications such as cement production, coal pit filling, civil engineering, etc., and the rest is piled up in ash dams, and the utilization rate of fly ash is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Grind the fly ash into particles with a particle size of less than 80 μm with a vibration grinder, take 50 g of the ground fly ash, add 100 mL of NaOH solution (concentration: 2 mol / L) and stir, then put it into a 200 mL plastic bottle, put Put it into a water bath with a temperature of 80°C for hydrothermal reaction. When the water is heated for 36 hours, use chemical analysis to measure the concentration of Si and Al in the solution, and filter through a 300-mesh sieve to obtain a solution containing Si and Al. , adding alkali-soluble Al according to the stoichiometric formula of P-type zeolite 2 o 3 , after aging for 36 hours, crystallized for 3 days under hydrothermal conditions at 80°C, filtered through a 500-mesh screen, and the solid was detected as P-type zeolite by XRD, and the sodium ion concentration in the filtered solution was detected by an atomic absorption spectrometer. recyclable.

Embodiment 2

[0021] Grind the fly ash into particles with a particle size of less than 80 μm with a planetary grinder, take 10 g of the ground fly ash, and add Al with a particle size of 40 μm 2 o 3 and solid NaOH into a nickel crucible (Si:Al:Na=1:1:1 molar ratio), mix evenly, keep warm in a muffle furnace at 300°C for 1h, take it out and grind it, put it into a 100mL plastic bottle, and add Example 1 Filter 50 mL of alkaline solution, heat it in water at 80°C for 5 hours, and filter it through a 500-mesh screen. The solid is fly ash zeolite adsorbent. The sodium ion concentration in the filtered solution is detected by atomic absorption spectrometer and can be recycled. .

Embodiment 3

[0023] Get the undissolved fly ash of 20g embodiment 1 and dry, add particle diameter and be the Al of 40 μm 2 o 3 and solid NaOH into a nickel crucible (Si:Al:Na=1:1:1 molar ratio), mix evenly, keep warm in a muffle furnace at 300°C for 1h, take it out and grind it, put it into a 100mL plastic bottle, and add Example 1: After synthesizing zeolite, filter out 50mL of alkaline solution. After mixing evenly, heat it in water at 80°C for 24 hours and filter it through a 500-mesh screen. The solid is fly ash zeolite adsorbent. The sodium ion concentration in the filtered solution is determined by atomic absorption After being detected by the spectrometer, it can be recycled.

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Abstract

The invention provides a process for hydrothermally synthesizing fly ash into a highly-pure zeolite and a fly ash zeolite adsorbent, which comprises the following steps: adding alkali solution into fly ash, obtaining solution containing silicon elements and aluminum elements under the hydrothermal condition, adding a certain amount of base soluble Al2O3 or SiO2 in the solution containing the silicon elements and the aluminum elements, and then preparing the highly-pure zeolite after hydrothermal reaction is carried out for a certain time; and adding the fly ash or the fly ash which is not dissolved under the hydrothermal condition into sodium hydroxide or sodium carbonate to be mixed uniformly (be calcined at a certain temperature), carrying out the hydrothermal condition, and then obtaining the fly ash zeolite adsorbent. The invention has simple process; the purity of the prepared highly-pure zeolite can achieve above 90 percent; and the prepared fly ash zeolite adsorbent has stronger adsorption capacity for heavy metal ions or organic wastewater.

Description

technical field [0001] The invention belongs to the technical field of fly ash reuse, in particular to a process for hydrothermally synthesizing fly ash into high-purity zeolite and fly ash zeolite adsorbent. Background technique [0002] Fly ash is solid waste discharged from thermal power plants. my country's fly ash discharge exceeds 100 million tons per year, and the world's discharge is 5 billion tons per year. Among the discharged fly ash, less than 1 / 2 of the fly ash is used for low value-added applications such as cement production, coal pit filling, and civil engineering, and the rest is piled up in ash dams, so the utilization rate of fly ash is low . [0003] Synthesizing zeolite with fly ash (referred to as fly ash zeolite) is a way to utilize fly ash with high added value. Zeolite is a kind of crystalline aluminosilicate microporous crystal, and zeolite is the most widely used adsorbent and catalyst. The zeolite synthesized from fly ash has good adsorption ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J20/18B01J20/30
Inventor 谭宏斌郭从盛傅明星
Owner SHAANXI UNIV OF TECH
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