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Preparation method of regenerated set cement

A technology for reclaiming cement and cement-based materials, applied in cement production, cement mixing devices, clay preparation devices, etc., can solve the problems of large carbon emissions, reduced added value, low added value, etc., to reduce energy consumption and carbon emissions. , the effect of reducing carbon emissions and improving compressive strength

Active Publication Date: 2020-07-03
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The added value of this recycling method is low, the quality of recycled aggregate concrete is unstable, and the use of technology is difficult
In addition, there are still some methods that separate cement stones from waste cement-based materials and then undergo high-temperature treatment to obtain recycled materials. However, this treatment method requires high-temperature treatment, which consumes a lot of energy and carbon emissions. Reduce the processing cost of the enterprise and reduce the added value

Method used

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  • Preparation method of regenerated set cement

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[0013] The invention provides a method for preparing regenerated cement, comprising the following steps: crushing, screening and grinding waste cement-based materials to obtain regenerated cement; making regenerated cement into a regenerated cement mixture, and mixing the regenerated cement After molding and curing, the recycled cement stone is obtained.

[0014] The waste cement-based material in the present invention is derived from one or more of waste cement concrete, waste cement mortar or waste cement paste.

[0015] In some preferred embodiments of the present invention, the fineness of recycled cement is 250-800m 2 / kg; By optimizing the fineness of recycled cement so that recycled cement has a suitable specific surface area, the hydration reaction speed is faster, and it is also beneficial to improve the early strength of recycled cement stone.

[0016] In some preferred embodiments of the present invention, the recycled cement mixture is prepared by mixing recycled ...

Embodiment 1

[0029] Embodiment 1 of the present invention provides a kind of preparation method of recycled cement stone, it comprises the steps:

[0030] After the waste cement concrete is crushed and the aggregate is separated, the waste cement stone is obtained, and the waste cement stone is ground to a fineness of 330m 2 / kg to obtain recycled cement; stir and mix recycled cement and water according to the mass ratio of 1:0.15 to obtain a dry and hard recycled cement mixture, and the recycled cement mixture is compressed to obtain an embryo body; then the embryo The body is placed in a pressure tank, and the CO 2 99.9% pure, CO 2 The embryo body is carbonized and maintained for 2 hours under the gas pressure of 0.2 MPa to obtain hardened regenerated cement stone.

[0031] The compressive strength of the recycled cement stone obtained by the method of this embodiment is 8 MPa.

Embodiment 2

[0033] Embodiment 2 of the present invention provides a kind of preparation method of recycled cement stone, it comprises the steps:

[0034] After the waste cement concrete is crushed and the aggregate is separated, the waste cement stone is obtained, and the waste cement stone is ground to a fineness of 500m 2 / kg to obtain recycled cement; stir and mix recycled cement and water according to the mass ratio of 1:0.15 to obtain a dry and hard recycled cement mixture, and the recycled cement mixture is compressed to obtain an embryo body; then the embryo The body is placed in a pressure tank, and the CO 2 99.9% pure, CO 2 The embryo body was carbonized and maintained for 8 hours under the gas pressure of 0.4 MPa to obtain hardened regenerated cement stone.

[0035] The compressive strength of the recycled cement stone obtained by the method of this embodiment is 10 MPa.

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Abstract

The invention discloses a preparation method of regenerated set cement. The preparation method comprises the following steps: crushing, screening and grinding a waste cement-based material to obtain regenerated cement; making the regenerated cement into a regenerated cement mixture, and molding and curing the regenerated cement mixture to obtain the regenerated set cement. According to the preparation method, the regenerated cement is prepared from the waste cement-based material; the regenerated cement does not contain clinker or other admixtures, the preparation method does not need any high-temperature treatment, the energy consumption and carbon emission for processing waste cement are effectively reduced, the gelling activity of regenerated set cement is excited through curing, carbondioxide can absorbed when the regenerated set cement is cured, the carbon emission is further reduced; and the prepared regenerated set cement also has good compressive strength.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of recycled cement stone. Background technique [0002] Cement is a material with high carbon dioxide emissions. In the production process, it not only needs to burn fossil energy to emit CO 2 At the same time, the raw material limestone decomposes during the production process and produces CO 2 . my country is a big country in the production and use of cement. According to data, the cumulative cement production in the 10 years from 2009 to 2018 reached 22 billion tons, with 0.88kg CO 2 / kg carbon emission factor to calculate the CO caused by cement production 2 Emissions are as high as 19.4 billion tons. Global temperature rise, sea level rise and extreme abnormal weather caused by high carbon emissions have threatened the living environment of human beings. Therefore, it is necessary to take effective measures such as resource re...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B32/00C04B40/02B28B1/00B28B3/00B28B11/24B28B17/02B28C5/00
CPCC04B7/246C04B32/00C04B40/0231B28C5/00B28B17/02B28B1/00B28B3/00B28B11/24C04B2201/50C04B2111/00017Y02P40/10
Inventor 李振程立
Owner YANGTZE UNIVERSITY