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Heavy metal curing agent based on polypropylene fiber and boiler ash and application of heavy metal curing agent

A technology of polypropylene fiber and boiler ash, applied in application, transportation and packaging, chemical instruments and methods, etc., can solve the threat of groundwater quality, pollute surrounding soil and other problems, achieve good curing effect, low price and good economic benefits and the effect of social benefits

Inactive Publication Date: 2019-07-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the boiler ash generated is stored in the open-air stack. The leachate produced by the surface runoff will pollute the surrounding soil, which will pose a threat to the quality of groundwater and cause a series of environmental problems.
If boiler ash can be used as the main material to prepare alkali-activated cementitious materials, it will not only solve the environmental protection caused by boiler ash, but also solve the problem of heavy metal-contaminated soil. However, no similar reports have been seen so far.

Method used

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  • Heavy metal curing agent based on polypropylene fiber and boiler ash and application of heavy metal curing agent
  • Heavy metal curing agent based on polypropylene fiber and boiler ash and application of heavy metal curing agent
  • Heavy metal curing agent based on polypropylene fiber and boiler ash and application of heavy metal curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under the conditions of different Si / Al molar ratios (2.4, 2.7, 3.0), Na / Al molar ratios (0.6, 0.7, 0.8), water-binder ratio 2.3, polypropylene fiber 0.3%, ash residue at 500r / min for 35min To prepare polypropylene fiber soil polymer, first mix boiler ash and polypropylene fiber, stir for 3 minutes, then add 10mol / L NaOH, water glass with a modulus of 3.3 and water, and continue stirring for 5 minutes to obtain a Geopolymer based on boiler ash and polypropylene fiber, then cured at 80°C for 24h to demould, then placed in a standard curing box at 20±2°C, relative humidity 95% for curing, measured after 3d, 7d and 28d respectively Compressive strength and 7d flexural strength.

[0025] Table 1 Compressive strength and flexural strength of test blocks under different Si / Al and Na / Al

[0026]

[0027]

Embodiment 2

[0029] Under the mix ratio of Si / Al molar ratio 2.7, Na / Al molar ratio 0.7, and water-binder ratio 2.3, rice husk fiber and polypropylene fiber were selected to be mixed, and the dosages were 0, 0.1%, 0.3% and 0.5%, respectively. Boiler ash slag was prepared under the condition of 500r / min and the activation time was 35min to prepare geopolymer, after curing at 80°C for 24 hours, it was removed from the mold, and then put into a standard curing box at 20±2°C and relative humidity of 95% for curing. The compressive strength and 7d flexural strength were measured after 3d, 7d and 28d.

[0030] Table 2 Compressive strength and flexural strength of test blocks under different types of fibers

[0031]

Embodiment 3

[0033]Under the mix ratio of Si / Al molar ratio 2.7, Na / Al molar ratio 0.7, water-binder ratio 2.3, polypropylene fiber content 0.3%, boiler ash slag activation time 35min at 500r / min, alkali activator NaOH concentration respectively 6, 8, 9, 10, 12mol / L, water glass modulus of 3.0, 3.1, 3.2, 3.3, 3.4 and 3.5 to prepare geopolymers, demould after curing at 80°C for 24 hours, and then put Put it into a standard curing box at 20±2°C and a relative humidity of 95% for curing, and measure the compressive strength and 7d flexural strength after 3d, 7d and 28d respectively.

[0034] Table 3 Compressive strength and flexural strength of test blocks under different alkali activator concentrations and water glass modulus

[0035]

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Abstract

The invention discloses a heavy metal curing agent based on polypropylene fiber and boiler ash and application of the heavy metal curing agent. The heavy metal curing agent comprises the following component raw materials: boiler ash, an alkali activator, water glass, polypropylene fiber and water; the heavy metal curing agent can be polymerized by excitation to form a cured body with high mechanical strength and good physical and chemical stability, and has a good curing effect when being used for solidifying and stabilizing solids contaminated by heavy metal such as Pb, Cd and the like; a leaching value of heavy metals meets the standard of groundwater class IV water body (GB / T14848-2017), and the raw materials of the heavy metal curing agent comes from industrial waste, therefore, the cost is low, waste control by waste is realized and the heavy metal curing agent has great application prospects.

Description

technical field [0001] The invention relates to a heavy metal curing agent, in particular to a heavy metal curing agent synthesized by raw materials such as polypropylene fiber and boiler ash, and also to a method for stabilizing heavy metal pollutants or waste by using such a heavy metal curing agent, which belongs to solid The field of waste resource utilization and environmental governance. Background technique [0002] The harm of heavy metals in the soil to the environment cannot be ignored. It can not only cause the yield and quality of agricultural by-products to decline, but also pollute surface water and groundwater. They can also be absorbed by the human body through the food chain and damage human health. Therefore, it is imminent to remediate the soil polluted by heavy metals. The solidification treatment of heavy metal polluted soil is an important means to deal with heavy metal polluted soil at present. Heavy metal curing agents generally use cement, fly ash,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09B3/00B09C1/08
CPCC09K17/40B09C1/08B09B3/21
Inventor 侯浩波游以文董祎挈周旻
Owner WUHAN UNIV
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