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Porous material of phosphate-based geopolymer and preparation method thereof

A technology of porous materials and polymers, applied in cement production and other directions, can solve the problems of complex process and high preparation cost, and achieve the effects of simple process, low preparation temperature and low cost

Inactive Publication Date: 2009-10-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the porous ceramic body must be fired at a temperature of 1000 ° C or even higher, the process is complicated, and the preparation cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method is as follows:

[0030] 1. Preparation of solid phase raw materials:

[0031] 1) Preparation of metakaolin: The kaolin powder produced by Guangxi Beihai Yankuang Group with a fineness of more than 200 meshes and washed with water was calcined in the air at 900°C for 2 hours to obtain metakaolin. Al in metakaolin 2 o 3 : 42.35%, SiO 2 : 56.91%, Fe 2 o 3 : 0.74%, with Al 2 o 3 Adjust its Al / Si (molar ratio)=1.0, P / Al (molar ratio)=1.4;

[0032] 2) The solid component, the ratio is as follows according to 100 parts by weight: 95 parts of metakaolin, 4.9 parts of alumina > 200 mesh, 0.5 part of aluminum powder > 400 mesh;

[0033] 3) Mix the solid components, stir and homogenize in a dry powder mixer for 30 minutes and then set aside;

[0034] 2. Preparation of liquid phase raw materials:

[0035] According to 100 parts by weight, the proportioning is as follows: industrial grade weight concentration is 52 parts of 85% phosphoric acid, 48 par...

Embodiment 2

[0040] The preparation method is as follows:

[0041] 1. Preparation of solid phase raw materials:

[0042] 1) the preparation of metakaolin: same as embodiment 1, just use Al 2 o 3 Adjust its Al / Si (molar ratio)=1.5, P / Al (molar ratio)=2.5;

[0043] 2) Solid components, the proportioning of 100 parts by weight is as follows: 77 parts of metakaolin, 22.92 parts of alumina > 200 mesh, 0.08 part of aluminum powder > 400 mesh;

[0044] 3) Mix the solid components, stir and homogenize in a dry powder mixer for 30 minutes and then set aside;

[0045] 2. Preparation of liquid phase raw materials:

[0046] According to 100 parts by weight, the proportioning ratio is as follows: industrial grade weight concentration is 76 parts of 85% phosphoric acid, 24 parts of water; mix uniformly according to the proportion and set aside;

[0047] 3. Mix the solid phase and liquid phase at a weight ratio of 1:1, adjust the viscosity to 2.5 Pa.S, stir for 10 minutes and homogenize before use; ...

Embodiment 3

[0051] The preparation method is as follows:

[0052] 2. Preparation of solid phase raw materials:

[0053] 1) the preparation of metakaolin: same as embodiment 1, just use Al 2 o 3 Adjust its Al / Si (molar ratio)=2.0, P / Al (molar ratio)=3.4;

[0054] 2) The solid component, the ratio is as follows according to 100 parts by weight: 65 parts of metakaolin, 34.92 parts of alumina > 200 mesh, 0.05 part of aluminum powder > 400 mesh;

[0055] 3) Mix the solid components, stir and homogenize in a dry powder mixer for 30 minutes and then set aside;

[0056] 2. Preparation of liquid phase raw materials:

[0057] According to 100 parts by weight, the proportion is as follows: industrial grade weight concentration is 85 parts of 85% phosphoric acid, 15 parts of water; mix uniformly according to the proportion and set aside;

[0058] 3. Mix the solid phase and liquid phase at a weight ratio of 1:1, adjust the viscosity to 5Pa.S, stir for 10 minutes and homogenize before use;

[005...

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Abstract

The invention discloses a porous material of phosphate-based geopolymer and a preparation method thereof. The preparation method comprises the following steps of: adopting metakaolin, alumina (or aluminium hydroxide), phosphoric acid and water as raw materials, adopting aluminium powder as a foaming agent and under a lower temperature ( 50-90 DEG C) preparing the porous material which adopts geopolymer material as a skeleton and has good properties. By testing the properties of the porous material, the result shows that the porous material has compression strength of 2.0 to 15.0MPa, apparent porosity of 30 percent to 70 percent, volume density of 0.40cm to 1.0g / cm and high-temperature resistance of more than 1300 DEG C; and the porous material with different properties and porous structures can be obtained by controlling molar ratio of Al / Si and P / Al and reaction conditions. The invention has simple technique and low cost and is expected to be applied in the fields of insulating materials, waste gas absorbing materials, sewage filtering materials, energy absorbing materials, insulating and encapsulating materials, military, aerospace and the like.

Description

technical field [0001] The invention relates to the fields of geopolymer materials and foam porous materials, in particular to a phosphoric acid or phosphate-based geopolymer porous material and a preparation method thereof. Background technique [0002] Geopolymeric materials are divided into alkali-based geopolymeric materials and phosphate-based geopolymeric materials. The research on alkali-based geopolymeric materials is relatively early, and the application of such materials can be traced back to ancient times, that is, kaolin, dolomite or limestone and salt lake composition Na 2 CO 3 , plant ash component K 2 CO 3 And the mixture of silica, after adding water and stirring, it will produce strong alkali NaOH and KOH, which will react with other components to form a mineral polymer binder to make artificial stone. [0003] Zhou Xintao, Su Dagen and others from South China University of Technology used the median diameter D 50 A phosphoric acid (phosphate)-based geo...

Claims

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Application Information

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IPC IPC(8): C04B12/02
CPCC04B28/006Y02P40/10C04B14/106C04B14/303C04B22/04C04B22/16
Inventor 崔学民刘乐平邱树恒贺艳
Owner GUANGXI UNIV
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