Geopolymer dry powder material and preparation method thereof

A technology of geopolymer and dry powder, applied in cement production and other directions, can solve the problems of inconvenience, restricting the popularization and application of geopolymer, high preparation cost, transportation and storage, etc. The effect of high temperature curing

Active Publication Date: 2021-06-22
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high preparation cost of sodium silicate solution and the inconvenience of transportation and storage have restricted the popularization and application of geopolymers.

Method used

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  • Geopolymer dry powder material and preparation method thereof

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preparation example Construction

[0024] A method for preparing geopolymer dry powder of the present invention adopts the method of alkali fusion treatment of part of the silicon-aluminum raw material, and replaces the activated silicon-aluminum raw material with the alkali-fused material, and then mixes it with other adjustment materials, and after grinding , to obtain geopolymer dry powder materials, such as figure 1 As shown, the specific steps are as follows:

[0025] a. Part of the silicon-aluminum raw material is subjected to the operation of path ① (calcination) to obtain material 1. If the raw material used is an industrial by-product after high-temperature calcination, it can directly enter path ③;

[0026] b. Mix part of the silicon-aluminum raw material with alkali flux, and carry out the treatment of path 2 (alkali fusion) to obtain material 2;

[0027] c. Mix the obtained material 1 (or the obtained material of path 3) with the material 2, wherein the content of the material 2 is controlled at 25...

Embodiment 1

[0031] Kaolin with a particle size of less than 1mm is used as the raw material of silicon-alumina, and it is calcined at 700°C for 12 hours to become metakaolin. In addition, a small part of kaolin is mixed with sodium hydroxide at a mass ratio of 1:1.2, and after proper grinding, it is heated at 500°C Calcined for 3 hours, then mixed the metakaolin and the alkali-fused material at a mass ratio of 1:0.35, then adjusted the silicon-aluminum ratio of the material to 2 by adding a certain amount of silica fume, and added a certain amount of calcium oxide, calcium oxide The added amount is 10% of the total material amount, and the finally obtained material is thoroughly mixed through grinding to obtain a geopolymer dry powder material, and the particle size is below 40 microns.

[0032] Prepare the geopolymer slurry according to the water-cement ratio of 0.4. After fully stirring, the slurry is put into a cylindrical mold with a diameter of 50 mm and a height of 100 mm. The curin...

Embodiment 2

[0034] Fly ash with a particle size of less than 1mm is used as the raw material of silica-alumina (fly ash itself is a high-temperature calcined product and has pozzolanic activity), and a part of fly ash is mixed with sodium hydroxide at a mass ratio of 1:1.5. Calcined at ℃ for 1.5h, then mixed the fly ash and the alkali-fused material at a mass ratio of 1:0.3, then adjusted the silicon-aluminum ratio of the material to 2.5 by adding a certain amount of silica fume, and added a certain amount of oxidation Calcium and calcium oxide are added in an amount of 5% of the total amount of materials, and the finally obtained materials are ground and mixed thoroughly to obtain geopolymer dry powder materials with a particle size of less than 40 microns.

[0035] Prepare geopolymer slurry according to the water-cement ratio of 0.35. After fully stirring, the slurry is put into a cylindrical mold with a diameter of 50mm and a height of 100mm. The curing box with a humidity of 93% was c...

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Abstract

The invention discloses a geopolymer dry powder material and a preparation method thereof. The preparation method comprises the following steps: by taking waste residues containing silicon and aluminum components as silicon and aluminum raw materials, carrying out high-temperature calcination activation on part of the silicon and aluminum raw materials; mixing a part of the silicon-aluminum raw material with an alkali flux, and carrying out high-temperature alkali fusion treatment; mixing the material subjected to high-temperature activation with the material subjected to alkali fusion, wherein the content of the material subjected to alkali fusion is controlled to be 25-40%; adding silica fume into the mixed material to adjust the silica-alumina ratio to be 1.5-5, meanwhile, adding calcium and magnesium oxides or hydroxides , and wherein the adding amount of the calcium and magnesium oxides or hydroxides is controlled to be within 15% of the total material amount; and grinding the obtained material to obtain the geopolymer dry powder material. The method overcomes the defects of high cost and inconvenience caused by the use of a sodium silicate solution in the traditional geopolymer synthesis; the synthesis raw material is the waste residue containing silicon and aluminum components, and is wide in source, low in price; and operation is simple.

Description

technical field [0001] The invention relates to the field of geopolymer materials, in particular to a geopolymer dry powder material and a preparation method thereof. Background technique [0002] Geopolymer (Geopolymer) is an inorganic silicon-aluminum polymer material, which was discovered and named by French scientist Professor J. Davidovits in the late 1970s. Compared with traditional cement, geopolymers have many excellent properties: early strength and rapid hardening, chemical corrosion resistance, high temperature resistance, good durability and good frost resistance, etc. At the same time, they have the advantages of abundant synthetic raw materials and low carbon emissions. Therefore, it has shown broad application prospects in the fields of building materials, ceramic materials, and nuclear waste disposal, and has become a focus of attention from all over the world. Its main reaction mechanism is to use active silicon-aluminum-rich raw materials to undergo a geop...

Claims

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Application Information

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IPC IPC(8): C04B12/00
CPCC04B12/005Y02P40/10
Inventor 张海军田全志姚蒴潘银海白颖楚
Owner CHINA UNIV OF MINING & TECH
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