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Method for preparing recycled cement by using waste concrete

A technology of waste concrete and recycled cement, which is applied in the direction of cement production, etc. It can solve the problems of difficult phase separation, high cost, and defects of aggregate and cement stone, and achieve the effects of being beneficial to environmental protection, reducing recycling costs, and reducing emissions

Inactive Publication Date: 2015-03-25
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the recycling process of waste concrete, the waste concrete must be crushed anyway, which is easy to produce defects in the aggregate and cement stone phases in the concrete; at the same time, it is very difficult to separate the aggregate and cement stone phases in the waste concrete. ,higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take waste concrete, limestone, clay, and iron powder respectively; crush the obtained waste concrete and limestone, and then pass the crushed waste concrete and limestone through a 50-mesh (270 μm) sieve to obtain waste concrete powder and limestone respectively. Powder: mix waste concrete powder, limestone powder with clay and iron powder, wherein the mass ratio of waste concrete powder, limestone powder, clay and iron powder is 15:8:1:1 to obtain a mixture; Take the mass of the mixture, take the grinding balls, mix the mixture and the grinding balls according to the ball-to-material ratio of 5:1, and put them together into the ball milling tank of the ball mill. The ball milling tank is a bearing steel tank, and the grinding balls are bearing steel balls. Mill for 4 hours Finally, the ball-milled mixture is taken out to prepare cement raw meal powder;

[0051] Place the prepared cement raw meal powder in an air atmosphere at 800°C for 20 minutes. During the heat pres...

Embodiment 2

[0054] Take waste concrete, limestone, clay, iron powder and coal respectively; crush the obtained waste concrete and limestone respectively, and pass the crushed waste concrete and limestone through a 400 mesh (38 μm) sieve respectively to obtain waste concrete powder , limestone powder; mix waste concrete powder, limestone powder with clay, iron powder, and coal, wherein the mass ratio of waste concrete powder, limestone powder, clay, iron powder, and coal is 80:40:8: 7:5 to get the mixture; weigh the mass of the mixture, take the balls, mix the mixture with the balls according to the ball-to-material ratio of 10:1, and put them together into the ball mill jar of the ball mill, the ball mill jar is an alumina ceramic jar, The grinding balls are alumina ceramic balls, and after ball milling for 10 hours, the mixture after ball milling is taken out to prepare cement raw meal powder;

[0055] Place the prepared cement raw meal powder in an air atmosphere at 1000°C for 60 minute...

Embodiment 3

[0058] Take waste concrete, limestone, clay, iron powder and coal respectively; crush the obtained waste concrete and limestone respectively, and then pass the crushed waste concrete and limestone through 200 mesh (75 μm) sieves respectively to obtain waste concrete powder , limestone powder; mix waste concrete powder, limestone powder with clay, iron powder, and coal, wherein the mass ratio of waste concrete powder, limestone powder, clay, iron powder, and coal is 55:30:6: 5:4 to get the mixture; weigh the mass of the mixture, take the balls, mix the mixture with the balls according to the ball-to-material ratio of 8:1, and put them together into the ball mill jar of the ball mill, the ball mill jar is an alumina ceramic jar, The grinding balls are alumina ceramic balls, and after ball milling for 6 hours, the mixture after ball milling is taken out to prepare cement raw meal powder;

[0059] Place the prepared cement raw meal powder in an air atmosphere at 900°C for 40 minut...

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PUM

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Abstract

The invention discloses a method for preparing recycled cement by using waste concrete. The method is specifically carried out according to the following steps: 1 preparing raw cement powder from waste concrete, limestone, clay, iron powder and coal; 2 calcining the raw cement powder prepared in the step 1 twice to prepare a cement clinker; and 3 taking gypsum powder and mixing the cement clinker obtained in the step 2 with the gypsum powder, so as to obtain the recycled cement. By using the method for preparing the recycled cement by using the waste concrete, the problems that the existing treatment mode of waste concrete is high in cost and not environment-friendly are solved; a new way for recycling the waste concrete is also provided; the cost is reduced; and the environment protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of cement preparation methods, and in particular relates to a method for preparing recycled cement from waste concrete. technical background [0002] With the acceleration of urbanization in our country, the construction industry has entered a stage of rapid development, accompanied by a large amount of construction waste, of which waste concrete accounts for the largest share. Most of the waste concrete is used as landfill, which not only occupies a large amount of cultivated land, but also causes environmental pollution, and only a small part is recycled. [0003] The recycling of waste concrete is mainly concentrated in the following two aspects: (1) used for filling the coast, serving as the foundation cushion of roads and buildings; (2) treating waste concrete, separating the aggregate phase and cement stone phase, and then recycle the recycled aggregate and cement stone respectively. [0004] In the ...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/36
CPCY02P40/10
Inventor 刘松涛王俊勃杨敏鸽贺辛亥付翀徐洁苏晓磊思芳曹风
Owner XI'AN POLYTECHNIC UNIVERSITY
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