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Method for carbonizing and activating waste concrete recycled micro powder by wet process and application of regenerated micro-powder

A technology of waste concrete and recycled micropowder, applied in cement production and other directions, can solve problems such as low utilization rate

Active Publication Date: 2020-12-25
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems of the prior art that the regenerated micropowder is directly utilized without treatment, the utilization rate is low, and an activator needs to be added, and a method for wet carbonization to activate waste concrete regenerated micropowder is proposed. Regenerated micropowder undergoes carbonization reaction in aqueous solution, and the calcium carbonate and silicon dioxide produced by carbonization have higher activity, and the activity of pozzolan is better than that of commonly used auxiliary cementing materials such as fly ash and silica fume, and can be used as auxiliary cementing materials

Method used

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  • Method for carbonizing and activating waste concrete recycled micro powder by wet process and application of regenerated micro-powder

Examples

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Effect test

Embodiment 1

[0040] A method for wet carbonization to activate waste concrete regenerated micropowder, comprising the following steps:

[0041] (1) After the waste concrete is crushed and screened, the regenerated micropowder with a particle size of less than 150 microns is collected, and the regenerated micropowder is added to water to form a mixed slurry with a concentration of 90 g / L. The water temperature is 20° C., and the stirring speed is 500 r / min;

[0042] (2) then pass into the industrial waste gas containing carbon dioxide in the mixed slurry formed in step (1), this industrial waste gas is the industrial waste gas of chemical industry, wherein the carbon dioxide volume fraction is 95%, and the ventilation rate of this industrial waste gas It is 0.2L / min / g, and the ventilation time is 10 minutes. During this process, the carbonization reaction between the regenerated micropowder and carbon dioxide occurs;

[0043] (3) Filtrating and drying the mixed slurry after the carbonizatio...

Embodiment 2

[0046] A method for wet carbonization to activate waste concrete regenerated micropowder, comprising the following steps:

[0047] (1) After crushing and screening the waste concrete, regenerated micropowder with a particle size of less than 150 microns is obtained, and the regenerated micropowder is added to water to form a mixed slurry with a concentration of 90 g / L. The water temperature is 20° C., and the stirring speed is 500 r / min;

[0048] (2) then pass into the industrial waste gas containing carbon dioxide in the mixed slurry formed in step (1), this industrial waste gas is the industrial waste gas of _ chemical industry, wherein the carbon dioxide volume fraction is 95%, and the ventilating of this industrial waste gas The rate is 0.2L / min / g, and the aeration time is 20 minutes. During this process, the carbonization reaction between the regenerated micropowder and carbon dioxide occurs;

[0049] (3) After the carbonization reaction in step (2) is completed, the mixe...

Embodiment 3

[0052] A method for wet carbonization to activate waste concrete regenerated micropowder, comprising the following steps:

[0053] (1) After crushing and screening waste concrete, regenerated micropowder with a particle size of less than 150 microns is obtained, and the regenerated micropowder is added to water to form a mixed slurry with a concentration of 60 g / L. The water temperature is 20° C., and the stirring speed is 300 r / min;

[0054] (2) then pass into the industrial waste gas containing carbon dioxide in the mixed slurry formed in step (1), this industrial waste gas is lime kiln industrial flue gas, wherein the carbon dioxide volume fraction is 37%, and the ventilation rate of this industrial waste gas It is 0.3L / min / g, and the ventilation time is 30 minutes. During this process, the carbonization reaction between the regenerated micropowder and carbon dioxide occurs;

[0055] (3) After the carbonization reaction in step (2) is completed, the mixed slurry is filtered...

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Abstract

The invention provides a method for carbonizing and activating waste concrete recycled micro powder by a wet process, which comprises the following steps of: taking powder generated in the process ofproducing recycled aggregate by crushing waste concrete as recycled micro powder, dispersing the recycled micro powder into water to form mixed slurry, and continuously introducing industrial waste gas containing carbon dioxide into the mixed slurry, in the process, carbon dioxide contained in the industrial waste gas and the regenerated micro powder are subjected to a carbonization reaction. According to the invention, the regenerated micro-powder is subjected to the carbonization reaction in an aqueous solution, the activity of calcium carbonate and silicon dioxide generated by carbonizationis higher, the volcanic ash activity is superior to that of common auxiliary cementing materials such as fly ash and silica fume, and the regenerated micro-powder can be used as an auxiliary cementing material.

Description

technical field [0001] The invention belongs to the field of recycled micropowder of waste and old concrete, and in particular relates to a method for activating recycled micropowder of waste concrete by wet carbonization and an application of the recycled micropowder. Background technique [0002] Due to the demolition or collapse of buildings, a large amount of construction waste will be generated. According to statistics, China is the country that produces the most construction waste in the world. The annual construction waste production is nearly 2 billion tons, of which waste concrete accounts for about 30%-40%. Deactivates large areas of soil. On the other hand, my country's infrastructure needs about 10 billion tons of sand and gravel aggregates every year. If such a large-scale demand is met only by mining, it will inevitably cause excessive consumption of limited natural resources and destroy the sustainable development of the ecological environment. If the waste...

Claims

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Application Information

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IPC IPC(8): C04B7/24
CPCC04B7/246Y02P40/10
Inventor 刘松辉管学茂朱建平赵松海张海波王雨利史才军勾密峰
Owner HENAN POLYTECHNIC UNIV
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