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Construction waste activating method

An activation method and technology of construction waste, applied in cement production, etc., can solve the problems of no business model, environmental pollution, low utilization rate of construction waste resources, etc.

Active Publication Date: 2018-06-05
SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a long time, my country's resource utilization rate of construction waste is low, less than 5%, which is far behind the average utilization rate of more than 90% in developed countries.
The environmental pollution is serious during the disposal process, and a business model recognized by the market has not been formed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) first grinding the construction dregs to obtain ground construction dregs with a particle size of 0.045-0.075 mm, and performing the first calcination at 800° C. for 3 hours to obtain the first calcined material;

[0043] (2) Mix the first calcined material in the step (1) with 0.6wt% of gypsum powder, 10wt% of lime powder and 15wt% of slag powder, and carry out the second grinding of the obtained mixed material to obtain a particle size of 0.045 to 0.075 The milled mixed material of mm was subjected to the second calcination at 850° C. for 5 hours to obtain the second calcined material;

[0044] (3) Soak the second calcined material in the step (2) in a NaOH saturated solution (in terms of NaOH, the mass ratio of the NaOH saturated solution to the second calcined material is 3.5:100), at room temperature Chemical excitation for 20 hours, drying at 105°C until the water content is 0.5%, and third grinding to obtain activated building powder with a particle size of <...

Embodiment 2

[0053] (1) first grinding the construction dregs to obtain ground construction dregs with a particle size of 0.045-0.075 mm, and performing the first calcination at 700° C. for 4 hours to obtain the first calcined material;

[0054] (2) Mix the first calcined material in the step (1) with 0.7wt% of gypsum powder, 11wt% of lime powder and 14wt% of slag powder, and carry out the second grinding of the obtained mixed material to obtain a particle size of 0.045 to 0.075 mm of ground mixed materials were subjected to a second calcination at 950° C. for 3 hours to obtain a second calcined material;

[0055] (3) soak the second calcined material in the step (2) in Na 2 SiO 3 Saturated solution (as Na 2 SiO 3 9H 2 O meter, the Na 2 SiO 3 The mass ratio of the saturated solution to the second calcined material is 4.5:100), chemically excited at room temperature for 25 hours, dried at 105°C to a moisture content of 0.5%, and thirdly ground to obtain an activated building with a pa...

Embodiment 3

[0064] (1) first grinding the construction dregs to obtain ground construction dregs with a particle size of 0.045-0.075 mm, and performing the first calcination at 600° C. for 5 hours to obtain the first calcined material;

[0065] (2) Mix the first calcined material in the step (1) with 0.8wt% of gypsum powder, 8wt% of lime powder and 16wt% of slag powder, and carry out the second grinding of the obtained mixed material to obtain a particle size of 0.045 to 0.075 The milled mixed material of mm is subjected to the second calcination at 900° C. for 4 hours to obtain the second calcined material;

[0066] (3) soak the second calcined material in the step (2) in Na 2 SiO 3 Saturated solution (as Na 2 SiO 3 9H 2 O meter, the Na 2 SiO 3 The mass ratio of the saturated solution to the second calcined material is 5:100), carry out chemical excitation at room temperature for 20 hours, dry at 105°C until the moisture content is 0.1%, and perform the third grinding to obtain an ...

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Abstract

The invention provides a construction waste activating method which comprises the following steps: performing primary calcination on construction wastes at a temperature of 600-800 DEG C for 3-5 hoursso as to obtain a first calcined material; mixing the first calcined material and gypsum powder, lime powder and slag powder, and performing secondary calcination on the obtained mixed material at atemperature of 850-950 DEG C for 2-5 hours so as to obtain a second calcined material; and performing chemical excitation on the second calcined material in an alkaline environment, thereby obtainingthe activated construction powder. According to the activating method provided by the invention, the obtained activated construction powder has characteristics of binding materials, so that the construction powder can serve as a binding material to be applied to non-sintered building materials, and reutilization of the construction wastes is realized. Experimental results in the embodiment show that the activated construction powder has high activity index, the activity index within 3 days is 83.9, and the activity index within 28 days is 92.9.

Description

technical field [0001] The invention relates to the technical field of reuse of construction dregs, in particular to an activation method of construction dregs. Background technique [0002] At present, my country is in the stage of rapid urbanization and industrialization, and various construction projects such as infrastructure and real estate can be seen everywhere. These projects have not only contributed to GDP, but also produced a large amount of waste, which has become one of the problems restricting the orderly development of cities. According to the research report of the Chinese Academy of Sciences, my country's annual construction waste is about 2.4 billion tons, accounting for 40% of the total urban waste. The continuous increase in the amount of construction waste is an accompanying problem in the process of urbanization in my country. [0003] For a long time, my country's resource utilization rate of construction waste is low, less than 5%, which is far behi...

Claims

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Application Information

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IPC IPC(8): C04B7/345C04B7/24C04B7/14
CPCC04B7/14C04B7/246C04B7/345Y02P40/10
Inventor 关宇欧小凡陆启政杨正松陈为武
Owner SHENZHEN HUAWEI ENVIRONMENTAL PROTECTION BUILDINGMATERIAL
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