Synthesis of zeolite with flyash

A technology for synthesizing zeolite and fly ash, used in chemical instruments and methods, crystalline aluminosilicate zeolites, molecular sieve compounds, etc.

Inactive Publication Date: 2003-01-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no public report on the synthesis of zeolite from fly ash in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Liquid / solid ratio (L / S) 2.0, NaOH concentration (mol / L) 1.0, synthesis time (h) 24, synthesis temperature (°C) 80~130, synthesis pressure (Mpa) 0~0.05. Concrete steps of the present invention are as follows:

[0028] (1) Weigh 250g of fly ash, put it into a beaker filled with 500mL of water, and stir for 2-3min;

[0029] (2) Weigh NaOH2Og (40g / mol×1mol / L×0.5L), put it into a beaker containing a mixed sample of fly ash and water, stir for 3-5min until NaOH is completely dissolved, and prepare from The base sample of zeolite synthesized from fly ash is ready for use.

[0030] (3) Pour the base sample in the beaker into the steel kettle of the autoclave, cover the top cover, and prepare for heating.

[0031] (4) Turn on the control switch of the autoclave, adjust the temperature to the set temperature, and start the hydrothermal synthesis. Keep the mixer stirring constantly while heating. Record the temperature and corresponding pressure once every 1h.

[...

Embodiment 2

[0033] Example 2: Liquid / solid ratio (L / S) 2.0, NaOH concentration (mol / L) 1.0, synthesis time (h) 48, synthesis temperature (°C) 122-166, synthesis pressure (Mpa) 0.15-0.35. Synthetic zeolite name: NaP1 type zeolite, zeolite chemical expression: Na 1.4 Al 2 Si 3.9 o 11.5 2H 2 O. Zeolite conversion rate (%): single species 60, total 60.

Embodiment 3

[0034] Example 3: liquid / solid ratio (L / S) 2.0, NaOH concentration (mol / L) 1.0, synthesis time (h) 48, synthesis temperature (°C) 126-192, synthesis pressure (Mpa) 0.1-0.7. Synthetic zeolite name: NaP1 type zeolite, analcime, chemical expression of zeolite: Na 1.4 Al 2 Si 3.9 o 11.5 2H 2 O, NaAlSi 2 o 6 ·H 2 O. Zeolite conversion rate (%): NaP1 type zeolite single variety 65, analcite single variety 15, total 80.

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PUM

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Abstract

The method for synthesizing zeolite by using fly ash is characterized by that it adopts hydrothermal synthesis method, the concentration of selected NaOH is 1.0-2.0 mol / L, ratio of aqueous solution and fly ash is 1.25-2.5 L / S, its synthesis temp. is 90-190 deg.C, synthesis pressure is 0-1.0 MPa and synthesis time is 22-72 hr. Firstly, weighing NaOH and fly ash, adding water, mixing stirring to make basic material, making hydrothermal treatment, then adopting high-pressure still to heat basic material, continuously stirring to make crystallization, after a certain time stopping heating, filtering synthetic sample and drying to obtain synthetic zeolite product. Its conversion rate is 60-80%.

Description

technical field [0001] The invention relates to a method for synthesizing zeolite, in particular to a method for synthesizing zeolite from fly ash. Background technique [0002] Zeolite is a hydrous aluminosilicate mineral with a hollow skeleton structure, and there are many uniform channels and well-arranged pores in the structure. This structure of zeolite makes it have unique selective adsorption, that is, filterability and cation exchange performance for molecules of different sizes. Therefore, zeolites can be used as molecular sieves, catalyst supports and detergent builders. [0003] The traditional industrial method for synthesizing zeolite is hydrothermal synthesis. That is, hydrothermal synthesis using the autogenous pressure of water at a certain temperature. Its synthesis process is: with commercially available Na 2 SiO 3 , Al(OH) 3 , NaOH as raw material, first make NaOH and Al(OH) 3 Preparation of NaAlO by mixing 2 , then NaAlO 2 with Na 2 SiO 3 Mixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/00C01B39/02
Inventor 王焰新郭永龙蔡鹤生杨志华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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