Method for preparing large-size analcite by utilizing hydrothermal crystallization of geopolymer

A geopolymer and hydrothermal crystallization technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of difficult-to-form analcime products and low sales of synthetic products, and achieve the effects of low cost, wide range of raw materials, and broadened application range

Inactive Publication Date: 2013-09-25
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the product is granular, and various organic amine or inorganic amine templates are used in the preparation process. The sales volume of...

Method used

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  • Method for preparing large-size analcite by utilizing hydrothermal crystallization of geopolymer
  • Method for preparing large-size analcite by utilizing hydrothermal crystallization of geopolymer
  • Method for preparing large-size analcite by utilizing hydrothermal crystallization of geopolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Method for preparing large-size analcime by hydrothermal crystallization of geopolymer

[0027] 1.Al 2 o 3 -SiO 2 Powder preparation:

[0028] Aluminum chloride and absolute ethanol were mixed with a molar ratio of 1:4 and magnetically stirred for 12 hours to prepare an aluminum sol for use, and ethyl orthosilicate and anhydrous ethanol were mixed with a molar ratio of 1:16 and magnetically stirred for half an hour to prepare a silicon sol. The sol is ready for use. Add aluminum sol dropwise to the stirring silica sol to prepare a composite sol with a silicon-aluminum ratio of 1:2, continue stirring for 2 hours, put it in a constant temperature water bath at 70°C until a transparent and uniform gel appears, and age at room temperature for 36 hours , dried at 105°C for 12 hours, ground, and calcined at 800°C for 2 hours to obtain amorphous Al 2 o 3 -SiO 2 The powder is ready for use.

[0029] 2. Preparation of geopolymer samples:

[0030] molar ratio SiO 2 / Al ...

Embodiment 2

[0035] Method for preparing large-size analcime by hydrothermal crystallization of geopolymer

[0036] 1.Al 2 o 3 -SiO 2 Powder preparation:

[0037] Mix aluminum nitrate and absolute ethanol with a molar ratio of 1:4 and magnetically stir for 12 hours to prepare aluminum sol for use, and mix ethyl orthosilicate and absolute ethanol with a molar ratio of 1:16 for half an hour to prepare silica sol stand-by. Add aluminum sol dropwise to the stirring silica sol to prepare a composite sol with a silicon-aluminum ratio of 1:2, continue stirring for 2 hours, put it in a constant temperature water bath at 70°C until a transparent and uniform gel appears, and age at room temperature for 36 hours , dried at 105°C for 12 hours, ground, and calcined at 800°C for 2 hours to obtain amorphous Al 2 o 3 -SiO 2 The powder is ready for use.

[0038] 2. Preparation of geopolymer samples:

[0039] molar ratio SiO 2 / Al 2 o 3 =4, Na 2 O / Al 2 o 3 =1,H 2 O / Na 2 O=7 to prepare geopo...

Embodiment 3

[0044] Method for preparing large-size analcime by hydrothermal crystallization of geopolymer

[0045] 1.Al 2 o 3 -SiO 2 Powder preparation:

[0046] Same as instance 2:

[0047] 2. Preparation of geopolymer samples:

[0048] molar ratio SiO 2 / Al 2 o 3 =4, Na 2 O / Al 2 o 3 =1,H 2 O / Na 2 O=10 to prepare geopolymers. Weigh Al according to the ratio 2 o 3 -SiO 2 Powder and water glass with a modulus of 0.9 (the water glass has been left to stand for 24 hours), adjust the H with deionized water 2 O / Na 2 O=10; then pour it into the mold after stirring in a constant temperature mixer for 2 minutes, maintain at 60°C for 24 hours, and demould to obtain a geopolymer test block with a certain strength.

[0049] 3. Preparation of large size analcime:

[0050] Put the geopolymer test block with a certain strength obtained in the above step into a hydrothermal kettle, add deionized water with 60% of the volume of the hydrothermal kettle, and prepare it under hydrothermal...

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Abstract

The invention discloses a method for preparing large-size analcite by utilizing hydrothermal crystallization of geopolymer. The method comprises a step of preparing large-size analcite in a hydrothermal kettle by using chemical synthetic aluminum silicate powder body as a solid raw material and using sodium water glass as an exciting agent. According to the method, the characteristic that the geopolymer is easily formed is utilized, and a large-size analcite block material or a powder material can be prepared at one time in situ. The analcite crystal synthetized by using the method has the characteristic of large size, the diameter can be controlled to be in the range of 20-150 microns, and the large-size analcite has the application prospect in the field of wastewater treatment, catalysis and optics; compared with a traditional preparation method of the analcite, the method is easy to operate, low in cost and suitable for scale preparation.

Description

technical field [0001] The invention relates to the field of geopolymer materials and large-size analcime, in particular to a method for preparing large-size analcime by geopolymer hydrothermal crystallization. Background technique [0002] Geopolymer materials were proposed by French materials scientist Joseph Davidovits in 1978. It is an amorphous three-dimensional network structure formed by silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron through bridging oxygen, and alkali metal or alkaline earth metal cations play a role in balancing the negative charge of aluminum-oxygen tetrahedron. Joseph Davidovits et al speculate that geopolymer materials are an intermediate state of zeolite molecular sieves. Usually, geopolymer materials are amorphous and non-crystalline structures, but through high-resolution transmission electron microscopy (HRTEM) analysis, our research group found that there are a small amount of nanoscale ordered structures in geopolymer materials...

Claims

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Application Information

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IPC IPC(8): C01B39/02
Inventor 崔学民张锦葛圆圆王艺频贺艳
Owner GUANGXI UNIV
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