Phosphoric acid excited magnesium-rich nickel slag geopolymer cementing material and preparation method thereof

A geopolymer, magnesium-nickel-rich slag technology, applied in cement production and other directions, can solve the problems of unstable strength, rapid setting, water pollution, etc., to promote rational utilization and environmental protection, good compressive strength, and reduce raw materials. cost effect

Pending Publication Date: 2022-01-04
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of fly ash produces dust due to untreated, which not only pollutes the atmosphere, but also pollutes the water body, and the toxic chemicals in it will also cause harm to the human body and organisms. Therefore, the treatment and comprehensive utilization of fly ash It has also become a problem that cannot be ignored at present. At present, there are many research results on alkali-activated cementitious materials, and the application is becoming mature. However, some problems have also been discovered during the rapid development, such as the problem of rapid setting, alkali-aggregate reaction, The configured strength is unstable, and the specimen cracks in the later stage of molding caused by large shrinkage, etc.

Method used

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  • Phosphoric acid excited magnesium-rich nickel slag geopolymer cementing material and preparation method thereof
  • Phosphoric acid excited magnesium-rich nickel slag geopolymer cementing material and preparation method thereof
  • Phosphoric acid excited magnesium-rich nickel slag geopolymer cementing material and preparation method thereof

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preparation example Construction

[0019] A phosphoric acid-excited magnesium-nickel slag geopolymer cementitious material and its preparation method, comprising: the content of the main chemical components of the magnesium-rich nickel slag and fly ash raw materials used in the embodiment of the present invention is analyzed by X-ray fluorescence spectroscopy, and the result As shown in Table 1:

[0020] Table 1 Contents of main chemical components of magnesium-rich nickel slag and fly ash raw materials

[0021]

Embodiment 1

[0023] This embodiment provides a green cementitious material based on magnesium-rich nickel slag and fly ash. 20%, phosphoric acid 10-20% (solid content), deionized water 20-30%.

[0024] The green cementitious material based on magnesium-rich nickel slag and fly ash is obtained through the following steps:

[0025] Powder refinement: put the magnesium-nickel slag and fly ash in an oven, and bake until the quality does not change. After cooling to room temperature, the magnesium-nickel slag is ball-milled with a ball mill, and then passed through a 200-mesh sieve, and the fly ash is directly Pass 200 mesh sieve;

[0026] Prepare acidic liquid: prepare acidic liquid with phosphoric acid and water, set aside after cooling;

[0027] Prepare clean slurry: mix the magnesium-rich nickel slag after the above-mentioned sieving with fly ash, then add acidic liquid, stir evenly, and obtain clean slurry;

[0028] Forming maintenance: After vibration forming, seal the mold poured with...

Embodiment 2

[0031] This embodiment provides a green cementitious material based on magnesium-rich nickel slag and fly ash. 40%, phosphoric acid 10-20% (solid content), deionized water 20-30%.

[0032] The green cementitious material based on magnesium-rich nickel slag and fly ash is obtained through the following steps:

[0033] Powder refinement: put the magnesium-nickel slag and fly ash in an oven, and bake until the quality does not change. After cooling to room temperature, the magnesium-nickel slag is ball-milled with a ball mill, and then passed through a 200-mesh sieve, and the fly ash is directly Pass 200 mesh sieve;

[0034] Prepare acidic liquid: prepare acidic liquid with phosphoric acid and water, set aside after cooling;

[0035] Prepare clean slurry: mix the magnesium-rich nickel slag after the above-mentioned sieving with fly ash, then add acidic liquid, stir evenly, and obtain clean slurry;

[0036] Forming maintenance: After vibration forming, seal the mold poured with...

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Abstract

The invention discloses a phosphoric acid excited magnesium-rich nickel slag geopolymer cementing material and a preparation method thereof. The cementing material is composed of magnesium-rich nickel slag and fly ash, and the cementing material is mainly composed of, by weight, 50-90 parts of magnesium-rich nickel slag, 50-10 parts of fly ash, 10-20 parts of phosphoric acid, and 20-40 parts of water. The magnesium-rich nickel slag with complex components and the fly ash can be directly used for preparing the cementing material, the cementing material with excellent comprehensive performances such as compressive strength is finally obtained by controlling the ratio of the raw materials, and the cementing material can be used as an admixture of cement and can also be used as a cementing material of concrete. According to the invention, the solid waste cementing material excited by acid is utilized, and the method has the advantages of simple processing technology, environmental protection, low energy consumption and low cost, and can show better compressive strength.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial solid waste, in particular to a phosphoric acid-activated magnesium-nickel slag geopolymer gelling material and a preparation method thereof. Background technique [0002] Due to the huge demand for nickel in the market, the amount of nickel slag produced every year is very large, occupying a large amount of land and the heavy metal ions in it are polluting, which has caused great damage to the surrounding ecological environment. my country's nickel ore is mainly silicon-rich and magnesium-rich laterite nickel ore, and the discharged ferronickel slag has the characteristics of high magnesium content. Nickel slag is often rapidly cooled by water quenching or air cooling, and the slag has no time to crystallize, resulting in a glass phase in its mineral phase, which has potential gelation. Therefore, the resource utilization of nickel slag has attracted the attention of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B12/00C04B7/26C04B7/153
CPCC04B28/006C04B12/005C04B7/1535C04B7/243C04B2111/0075C04B2201/50C04B18/144C04B18/08C04B22/165C04B22/002Y02P40/10
Inventor 王觅堂李金丞张栋梁张晓伟
Owner UNIV OF SHANGHAI FOR SCI & TECH
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