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Lightweight fly ash-based sodium aluminum silicate plate and preparation method thereof

A technology based on sodium aluminosilicate and sodium aluminosilicate is applied in the field of light fly ash-based sodium aluminosilicate board material and its preparation, and can solve the problems of high cost, high utilization of natural resources, potential safety hazards and the like, To achieve the effect of excellent performance, simple preparation process and low cost

Inactive Publication Date: 2015-10-21
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials basically use siliceous materials such as quartz powder and diatomaceous earth, and calcareous materials such as lime, calcium carbide mud, and cement. High temperature (120-200°C) and high-pressure (0.8-1.2MPa) steam curing requires high cost and existence. Potential safety hazards, more use of natural resources, less use of solid waste resources
In recent years, due to the indiscriminate logging of lime and its impact on environmental pollution, the country has gradually restricted the mining and use of lime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] Another embodiment of the present invention provides a preparation method of the above-mentioned light fly ash-based sodium aluminosilicate board, which includes:

[0033] (1) Preparation of alkaline stimulator

[0034] Choose sodium (potassium) water glass and NaOH / KOH as raw materials, dissolve NaOH / KOH in water, and control the molar concentration at 5-15 mol / L; choose sodium (potassium) water glass, and control the modulus at 2~3.5; Mix the mixture, control the overall modulus of the mixture at 1.0-2.0; stir for 1-10min, put it in a plastic container, and let it stand for 12-48h.

[0035] (2) Mix and stir

[0036] Mix fly ash, calcium stearate, alkaline stimulant and water, then mix and stir with fiber to obtain slurry. The stirring time is 1-10min, and it can be stirred for 1, 3, 5, 7, 10min, etc., until it is evenly stirred. ;

[0037] (3) Pouring

[0038] Pour the slurry into the mold and adjust the pouring diffusion to about 15%;

[0039] (4) Pre-curing

[0040] After the ...

Embodiment 1

[0048] Measure 145 g of sodium water glass, with a modulus of 3.21 and a density of 1.38 g / ml; weigh 124 g of NaOH and 502 g of water, mix them evenly, and place them for 24 hours as a liquid alkaline stimulator.

[0049] Weigh 1122g fly ash, 224g fiber and 11.2g calcium stearate.

[0050] Mix the liquid alkaline activator with the solid raw material, stir evenly, add the fiber, and stir for 5 minutes.

[0051] Pour the mixed materials into a steel mold or a plastic mold, and vacuum dry for 4 hours at 40°C and 0.1atm.

[0052] Cured for 8h in a drying box at a temperature of 70℃,

[0053] Demould, use a cutting machine to cut, remove excess bottom material and top material. Get the finished product.

[0054] The test weight of the sample obtained after 7 days is 900kg / m 3 , The flexural strength is 5.6MPa(7d), the thermal conductivity is 0.156W / (m·K)

Embodiment 2

[0056] Measure 116 g of sodium water glass with a modulus of 3.21 and a density of 1.38 g / ml; weigh 99 g of NaOH and 502 g of water and mix them evenly, and place them for 24 hours as a liquid alkaline stimulant.

[0057] Weigh 898 g of fly ash, 224 g of slag, 224 g of fiber, and 11.2 g of calcium stearate.

[0058] Mix the liquid alkaline activator with the solid raw materials, stir evenly, add the fibers, and stir for 5 minutes.

[0059] Pour the mixed materials into a steel mold or a plastic mold, and vacuum dry for 4 hours at 40°C and 0.1atm.

[0060] Cured for 8h in a drying box at a temperature of 70℃,

[0061] Demould, use a cutting machine to cut, remove excess bottom material and top material. Get the finished product.

[0062] The test weight of the sample obtained after 7 days is 920kg / m 3 , Flexural strength 6.2MPa(7d), thermal conductivity of 0.175W / (m·K)

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Abstract

The present invention discloses a lightweight fly ash-based sodium aluminum silicate plate and a preparation method thereof, wherein the raw materials of the plate comprise, by mass, 50-80 wt.% of silicon-aluminum solid waste, 1-10 wt.% of easily-dispersed fibers, 20-40 wt.% of an alkaline activator, 0.1-1 wt.% of calcium stearate, 0.1-1 wt.% of an efficient water reduction agent, and the like, wherein the fly ash in the solid waste accounts for 70-100 wt.%. According to the present invention, mixing, stirring, casting, vacuum drying, low-temperature curing, demolding, cutting and burnishing are performed to prepare the lightweight fly ash-based sodium aluminum silicate plate; the process does not require lime, cement and other raw materials and does not require high temperature and high pressure; the atmospheric pressure and low temperature (60-80 DEG C) curing is performed to prepare the product; and the solid waste is used so as to reduce the cost and improve the safety production capability and the production efficiency.

Description

Technical field [0001] The invention relates to a light fly ash-based sodium aluminosilicate board material and a preparation method thereof. technical background [0002] With the continuous consumption of energy in the world, countries are paying more and more attention to energy conservation, and building energy conservation is becoming one of the focuses of government attention. The construction industry consumes a lot of resources and energy, and also produces solid waste, sewage, noise, etc. Building energy conservation is one of the important ways to reduce environmental pollution and solve the energy crisis. Building energy consumption accounts for about 30% of the total social energy consumption. It is estimated that in 2020, the national construction area will be twice that of 2000. The existing domestic residential area is about 40 billion m 2 , Of which less than 200 million m2 meet the design standards for building energy efficiency 2 , Accounting for about 0.5%, a...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B18/08
CPCY02W30/91
Inventor 刘泽徐元义卢浩孔凡龙
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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