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Preparation method of anorthite-based porous lightweight refractory material

A light-weight refractory material, anorthite technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of increasing content, too fast increase of slurry viscosity, roasting cracking, etc., to increase strength and refractoriness, distribution Uniform, stable effect with the presence of air bubbles

Inactive Publication Date: 2022-02-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The alkaline earth geopolymer body can be used to make porous lightweight refractory materials. The conventional alkaline earth geopolymer body mainly uses NaOH or KOH as the basic activator. The covalent structure of Si-O-Si and Al-O-Al dissolves and depolymerizes, and makes the tetrahedral ion cluster [SiO 4 ] 4- and [AlO 4 ] 5- Generate X in a short time + x {-SiO 2 ) z -AlO 2 -}·mH 2 O three-dimensional network structure (X is a metal cation), but this system has the disadvantages of uncontrollable reaction initiation and too fast increase of slurry viscosity, which is not conducive to sufficient mixing of raw material powder and sufficient stirring of foaming agent Foaming, that is, this will lead to the phenomenon that the obtained geopolymer body is prone to uneven distribution of components, uneven shrinkage at various parts, drying / roasting cracking, and difficulty in increasing porosity
[0004] In addition, NaOH / KOH as an alkaline activator will correspondingly increase the content of metal cations in the green body, thereby increasing the content of albite / potassium feldspar in the fired refractories, which will also reduce the refractoriness and performance of the refractories. Structural strength, these factors greatly limit the possibility of geopolymers in the preparation of refractory materials

Method used

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Experimental program
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Effect test

preparation example Construction

[0036] A preparation method of anorthite-based porous lightweight refractory material, comprising the steps of:

[0037] 1) Dissolve the foam stabilizer polyvinyl alcohol in the aqueous solution to obtain the PVA aqueous solution; to dissolve the PVA, it needs to be stirred and swelled in cold water first, and then the water temperature is gradually raised to 85-95°C and then kept for 20-40 minutes;

[0038]2) Add tetramethylammonium hydroxide aqueous solution to the obtained PVA aqueous solution, and mix uniformly to obtain an alkaline excitation solution; the mass fraction of tetramethylammonium hydroxide in the alkaline excitation solution is 25wt.%, tetramethylhydrogen The mass ratio of ammonium oxide, raw material powder and offal water of the system is 0.08~0.1:100;

[0039] 3) Add metakaolin powder, calcium oxide powder, and silicon dioxide powder into the obtained alkaline excitation solution, and stir evenly to obtain calcium-aluminosilicate-based geopolymer slurry; m...

Embodiment 1

[0044] Prepare the anorthite-based porous lightweight refractory according to the following steps:

[0045] 1) Preparation of PVA aqueous solution A: Pour 1 wt.% PVA powder relative to the total distilled water content of the experiment into distilled water at room temperature, and while maintaining magnetic stirring, slowly heat the aqueous solution to 90° C. and keep it warm for 30 minutes to obtain PVA aqueous solution A;

[0046] 2) Preparation of alkaline excitation solution B: add tetramethylammonium hydroxide aqueous solution with a mass fraction of 25wt.% to solution A, and stir for 10 minutes under magnetic stirring at a rotational speed of 1000rpm to obtain a TMAH content of 8.7wt.% relative to the raw material powder Alkaline excitation solution B;

[0047] 3) Preparation of calcium-aluminosilicate-based geopolymer slurry C: Weigh out metakaolin powder, calcium oxide powder and silicon dioxide powder of corresponding quality according to the molar ratio of silicon, ...

Embodiment 2

[0057] Change the mass ratio of total powder to total water in step 3) of Example 1 to 1:1, and the remaining steps and parameters are exactly the same as in Example 1. The porous calcium aluminum silicate-based geopolymer prepared under this condition The bulk density of green body is 0.929g / cm 3 , the compressive strength is 10.86MPa; the volume density of the anorthite-based porous lightweight refractory material prepared under this condition is 0.847g / cm 3 , the porosity is 64%, the compressive strength is 24.33MPa, and the thermal conductivity is 0.1511W / mK.

[0058] Figure 6 It is the OM / SEM figure after the gold plating of the anorthite-based porous lightweight refractory material obtained by the above-mentioned preparation method, from Figure 6 It can be seen that the pore size of the refractory material is uneven and unevenly distributed.

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Abstract

The invention belongs to the technical field of porous lightweight refractory materials, and particularly relates to a preparation method of an anorthite-based porous lightweight refractory material, the preparation method comprises the following steps: taking a tetramethylammonium hydroxide aqueous solution in which a foam stabilizer polyvinyl alcohol is dissolved as an alkaline activator; taking a mixture of metakaolin, calcium oxide and silicon dioxide which are proportioned according to the chemical components of the calcium aluminosilicate as raw material powder, fully stirring and reacting an alkaline exciting agent and the raw material powder, and then stirring at a high speed by taking sodium dodecyl benzene sulfonate as a foaming agent / initiator to prepare a porous calcium aluminosilicate-based geopolymer blank; and finally, firing the dried green body at high temperature to obtain the anorthite-based porous lightweight refractory material. According to the preparation method, metakaolin is taken as a main raw material source, the raw material source is wide, the whole preparation process is pollution-free and waste-free, the cost is relatively low, and the industrial popularization value is relatively high.

Description

technical field [0001] The invention belongs to the technical field of porous lightweight refractory materials, and in particular relates to a preparation method of anorthite-based porous lightweight refractory materials. Background technique [0002] Geopolymers, also known as "mineral polymer materials", mainly refer to silicon-aluminum materials (natural minerals, solid wastes or industrial by-products) stimulated by acidic or alkaline solutions, and the internal Si-O tetrahedron and Al-O tetrahedron It is a three-dimensional network polymer connected by sharing O, which belongs to inorganic polymer materials. Geopolymer material has the advantages of wide source of raw materials, simple preparation process, low pollution emission, excellent mechanical properties, corrosion resistance, etc. It is a new type of green inorganic material that can replace Portland cement. [0003] The alkaline earth geopolymer body can be used to make porous lightweight refractory materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/66
CPCC04B38/10C04B35/66C04B2235/3208C04B2235/3418C04B2235/349C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2235/95
Inventor 武杏荣杨思捷申星梅曹发斌
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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