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Method for solidifying lead alkali residues by using fly ash-based geopolymer with assistance of microwaves

A microwave-assisted, fly ash technology, applied in cement production and other directions, can solve problems such as low strength, high heavy metal leaching rate, and reduce leaching, and achieve the effects of improving compressive performance, reducing lead leaching, and reducing leaching rate.

Inactive Publication Date: 2020-04-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for solidifying lead-alkali slag with microwave-assisted fly ash base polymer, which promotes the geological polymerization process in a short time through microwave-assisted heating, so that the lead-alkali slag Better embedded in the three-dimensional network structure of geopolymers, microwave-assisted geopolymer solidification of lead-alkali slag is conducive to the formation of more hydration products, making the structure more compact, thereby improving the early strength and thermal stability of geopolymers At the same time, the leaching of lead in the lead-alkali slag is greatly reduced, thereby solving the technical problems of low strength of the geopolymer solidified heavy metal geopolymer and high heavy metal leaching rate in the prior art

Method used

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  • Method for solidifying lead alkali residues by using fly ash-based geopolymer with assistance of microwaves
  • Method for solidifying lead alkali residues by using fly ash-based geopolymer with assistance of microwaves
  • Method for solidifying lead alkali residues by using fly ash-based geopolymer with assistance of microwaves

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A method for solidifying lead-alkali slag with microwave-assisted fly ash base polymer, comprising the steps:

[0060] (1) Mix fly ash, lead alkali slag, alkali activator and water, fix the water-cement ratio to 0.47, stir at low speed for 120s at room temperature, add 1.5 modulus alkali activator while stirring, alkali activator and pulverized coal The mass ratio of ash to the solid of lead-alkali slag is 3:5, and then high-speed stirring for 120s;

[0061] (2) Pour the evenly stirred net slurry in step (1) into 40×40×40mm 3 In a silicone mold, remove air bubbles by vacuuming, and then cover with plastic wrap;

[0062] (3) Put the silica gel mold poured into the clean pulp in step (2) into a 75°C oven and heat for 24 hours;

[0063] (4) demoulding after the clean slurry in the step (3) is taken out from the oven to obtain the fly ash-based lead-alkali slag geopolymer, and its XRD spectrum is as follows image 3 shown. The fly ash-based lead-alkali slag geopolymer i...

Embodiment 2

[0067] Put the fly ash-based lead-alkali slag geopolymer after demoulding in Example 1 into a microwave oven, adjust the microwave wattage to 100W, heat for 15min, and measure the compressive strength and 28d lead leaching rate after cooling.

Embodiment 3

[0069] Put the fly ash-based lead-alkali slag geopolymer after demoulding in Example 1 into a microwave oven, adjust the microwave wattage to 200W, heat for 15min, and measure the compressive strength and 28d lead leaching rate after cooling.

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Abstract

The invention belongs to the field of treatment and resource utilization of solid waste, and particularly relates to a method for solidifying lead alkali residues by using a fly ash-based geopolymer with the assistance of microwaves. According to the method, fly ash and lead alkali residues are mixed; an alkali activator is used for excitation; water is added to adjust a water-ash ratio; and withthe assistance of microwave heating, a geological polymerization process and embedding of the lead alkali residues are promoted within a short time, so the compressive strength of the geopolymer is improved, and the leaching rate of heavy metals is reduced. The method for solidifying lead alkali residues by using a fly ash-based geopolymer with the assistance of microwaves can reduce environmentalpollution caused by the lead alkali residues and further improve the compression resistance of the geopolymer; and experiment results show that the compression strength of the lead alkali residue geopolymer prepared through the microwave-assisted process can achieve 18.75 MPa, and the leaching rate of the lead alkali residues can be reduced by 90.61%.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste treatment, and more specifically relates to a method for solidifying lead-alkali slag with microwave-assisted fly ash base polymer. Background technique [0002] As a new type of aluminosilicate inorganic polymer gelling material, geopolymer has attracted extensive attention in many fields because of its excellent performance. Among them, the solidification effect of geopolymer on heavy metals has become an emerging research direction for heavy metal pollution treatment. [0003] Solidifying heavy metals with fly ash base polymers is a low-cost green treatment method, but the existing methods of solidifying heavy metals will reduce the strength of the obtained geopolymers, which cannot meet the strength standards of general Portland cement; Some solidification methods have poor long-term durability for heavy metal solidification. The lead leaching rate of the fly ash base polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/006C04B40/0218C04B2201/50C04B18/08C04B12/04C04B18/144C04B22/002Y02P40/10
Inventor 侯慧杰孙滢斐李名扬柯妍李嘉豪张攀胡少刚胡敬平杨家宽刘冰川梁莎肖可可
Owner HUAZHONG UNIV OF SCI & TECH