Preparation method and application of slag-fly ash geopolymer

A geopolymer, fly ash technology, applied in solid waste management, sustainable waste treatment, cement production, etc., can solve problems such as low production cost and heavy metal pollution

Active Publication Date: 2021-07-30
绍兴越创岩土科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a preparation method and application of slag-fly ash geopolymer, the production cost is low, and the effect of treating waste with waste has been realized, and the prepared geopolymer It has the characteristics of high compressive strength and good curing effect of heavy metal contaminated soil, which is beneficial to solve the problem of heavy metal pollution in soil

Method used

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  • Preparation method and application of slag-fly ash geopolymer
  • Preparation method and application of slag-fly ash geopolymer
  • Preparation method and application of slag-fly ash geopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method of slag-fly ash geopolymer, comprising the following steps:

[0047] (a) Water glass, sodium hydroxide solid, and water are mixed into a clarified alkali activator with a modulus of 1.4 by magnetic stirring, and sealed for 24 hours;

[0048] (b) Grinding the slag and passing through a 0.25mm sieve, stirring the finely ground slag and low-calcium fly ash evenly, the slag dosage is 10% of the total mass of the slag and low-calcium fly ash; The fly ash mixture is stirred and mixed with an alkali activator to make a slurry with a water-solid ratio of 0.29, wherein the amount of the alkali activator is 30% of the total mass of the slag and low-calcium fly ash;

[0049] (c) Evenly coat vaseline in the triple mold, inject the slurry in 3 times, and after filling, place the triple mold with the slurry on a vibrating table to vibrate for 3 minutes to eliminate air bubbles and vibrate to obtain the first sample;

[0050] (d) Seal the initial sample with a pl...

Embodiment 2～10

[0052] The slag-fly ash geopolymer was prepared according to the method of Example 1. The alkali activator modulus, slag content, slurry water-solid ratio, and alkali activator content of each example are shown in Table 1.

[0053] Table 1

[0054]

[0055] The compressive strength test was carried out on the slag-fly ash geopolymer prepared in Examples 1-10, and the results are shown in Table 2. As can be seen from Table 2, the geopolymer with higher compressive strength can be prepared by the preparation method of the present invention, and along with the growth of the curing age, the compressive strength of the geopolymer is a trend of increasing, embodiment 10 The compressive strength of the prepared geopolymer is the best.

[0056] Table 2

[0057]

[0058]

[0059] The slag-fly ash geopolymer can be used as a curing agent to stabilize heavy metal contaminated soil.

Embodiment 11

[0061] Geopolymers are applied to the solidification of heavy metal-contaminated soils, and the specific methods are:

[0062] (a) Water glass, sodium hydroxide solid, and water are mixed into a clarified alkali activator with a modulus of 1.4 by magnetic stirring, and sealed for 24 hours;

[0063] (b) Pre-stir the heavy metal contaminated soil; grind the slag and pass through a 0.25mm sieve, add the finely ground slag and low-calcium fly ash into the heavy metal contaminated soil and stir evenly; then add an alkali activator and stir to prepare into a mixture;

[0064] (c) Apply vaseline evenly in the triple mold, inject the mixture in 3 times, after filling, place the triple mold with the mixture on a vibrating table to vibrate for 3 minutes to eliminate air bubbles and vibrate to obtain the first product;

[0065] (d) Seal the primary product with a plastic wrap to isolate the air, place it at room temperature (20±2°C) for 24 hours, and then release the mold to obtain a he...

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Abstract

The invention discloses a preparation method and application of a slag-fly ash geopolymer, and the preparation method comprises the following steps: (a) using sodium silicate, sodium hydroxide solid and water to prepare an alkali activator through magnetic stirring, and conducting sealing and standing; (b) grinding and sieving the furnace slag, and uniformly stirring the ground furnace slag and low-calcium fly ash, stirring and mixing the slag and low-calcium fly ash mixture and an alkali activator to prepare slurry; (c) uniformly smearing Vaseline in a triple mold, injecting the slurry in three times, and after filling is completed, performing strickling and vibration treatment to prepare a prototype sample; and (d) sealing the prototype sample with a preservative film, conducting curing at normal temperature, and conducting demolding to obtain a finished product. The preparation method is simple in process and low in production cost, and the effect of treating waste with waste is achieved; and meanwhile, the prepared geopolymer has the characteristics of high compressive strength and good curing and repairing effect on heavy metal polluted soil, and is beneficial to solving the problem of heavy metal pollution of the soil.

Description

technical field [0001] The invention relates to the technical field of geopolymers, in particular to a preparation method and application of a slag-fly ash geopolymer. Background technique [0002] The "China Energy Big Data Report (2020)" pointed out that thermal power is still my country's main source of electricity (accounting for 69.6%). Thermal power plants put coal powder into the high-temperature furnace for suspension combustion, and the fine ash collected in the flue gas becomes fly ash (fly ash), and the residue at the bottom of the furnace after coal combustion is slag. The annual output of slag and fly ash has reached nearly 800 million tons, and on average every two tons of coal consumed will produce one ton of waste. The particle size of fly ash in the process of burning coal in power plants is extremely small, and it is easy to float in the air and accumulate in large quantities, which not only occupies land, but also pollutes the environment and endangers hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/08C04B18/10
CPCC04B28/006C04B2111/00784C04B12/04C04B22/062C04B18/08C04B18/10C04B18/0472Y02W30/91
Inventor 陈忠清吕越丁佩思徐东阳
Owner 绍兴越创岩土科技有限公司
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