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A processing method of engineering spoil and cement product

A technology of engineering spoils and treatment methods, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as high energy consumption, difficulty in popularizing and using technical means, and debris flow, so as to avoid environmental hazards and reduce Dealing with energy consumption and reducing occupancy

Active Publication Date: 2022-05-06
CHINA CONSTR SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The remaining mud is difficult to dispose of. Generally, it is made into mud cake by means of pressure filtration, and then reused after water circulation. In actual conditions, mud accounts for about 20-60% of the mass percentage of project spoils. The most direct treatment method is to discard Landfill, however, improper landfill disposal of mud cake is more prone to secondary disasters such as mudslides
Another method of recycling engineering spoils is sintering to make bricks. This method is the most effective means of comprehensive utilization of engineering spoils. However, due to the need for high-temperature calcination, it is a high-energy-consuming industry. Policy orientation makes it difficult to promote the use of this technical means

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Vibrate the project spoil and carry out mud-sand separation treatment, add water during the separation process, and separate to obtain aggregates with a particle size greater than 0.075mm and muddy water with a water content of 55%;

[0036] Mix the muddy water with cement and sodium silicate at a mass ratio of 100:3.5:3, and wet ball mill the mixture for 0.2 to obtain a slurry;

[0037] The slurry was poured into a mold for grouting molding, stripped, and naturally cured for 7 days to obtain a cement product. The compressive strength of the cement product was 5 MPa.

Embodiment 2

[0039] Vibrate the project spoil and carry out mud-sand separation treatment, add water during the separation process, and separate to obtain aggregates with a particle size greater than 0.1mm and muddy water with a water content of 65%;

[0040] Mix muddy water with cement, sodium tripolyphosphate and sodium gluconate at a mass ratio of 100:45:1.5:0.5, and wet ball mill the mixture for 5 hours to obtain a slurry;

[0041] The slurry was poured into a mold for grouting molding, stripped, and naturally cured for 3 days to obtain a cement product. The compressive strength of the cement product was 25 MPa.

Embodiment 3

[0043] Vibrate the project spoil and carry out mud-sand separation treatment, add water during the separation process, and separate to obtain aggregates with a particle size greater than 0.2mm and muddy water with a water content of 70%;

[0044] Mix muddy water and cement at a mass ratio of 100:50, and wet ball mill the mixture for 5 hours to obtain a slurry;

[0045] The slurry was poured into a mold for grouting, stripped, and naturally cured for 10 days to obtain a cement product. The compressive strength of the cement product was 18 MPa.

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Abstract

The embodiment of the present invention discloses a method for processing engineering spoil and a cement product. The processing method comprises the following steps: vibrating the engineering spoil and performing mud-sand separation treatment to obtain aggregate and muddy water; The agent is mixed in a mass ratio of 100:3-50:0-3, and the mixture is wet ball milled for 0.2-5h to obtain a slurry; the slurry is poured into a mold for grouting molding, film release, and maintenance to obtain a cement product. The method does not need dehydration treatment or high temperature sintering for the mud water treated by sand and gravel separation, which can not only greatly reduce the energy consumption of the treatment, but also can reuse the obtained cement products, avoiding the dehydration and disposal of the mud cake in the prior art. Environmental hazards caused by landfills. In addition, the method can realize the resource utilization of more than 95% of the engineering spoil, thereby reducing the occupation of land resources.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of engineering material processing, in particular to a method for processing engineering spoil and cement products. Background technique [0002] With the continuous acceleration of urban construction, the construction of large-scale infrastructure such as urban renewal and rail transit has produced a large number of engineering spoils. According to statistics, from 2017 to 2020, the average annual production of engineering spoils in Shenzhen is about 91.5 million cubic meters, which brings huge pressure on environmental protection and sustainable development of urban construction. The traditional method of engineering spoils is mainly landfill in the receiving site, which not only takes up a lot of valuable land resources, but also is prone to secondary disasters if it is not disposed of properly. [0003] In the prior art, the resource treatment of engineering spoils mainly adopt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/02C04B18/16
CPCC04B28/00C04B20/02C04B18/16C04B2201/50C04B22/0046C04B2103/302Y02W30/91
Inventor 彭孟啟周鼎齐贺高昊元迂晓轩丁艳玲王静贻
Owner CHINA CONSTR SCI & TECH CO LTD