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Treatment method of construction waste

A technology of construction dregs and treatment methods, which is applied in the direction of grain treatment and restoration of polluted soil, etc. It can solve the problems of high treatment cost, damage to the ecological environment, and occupation of land, and achieve the goal of realizing resource utilization and reducing soil moisture content Effect

Inactive Publication Date: 2021-02-23
宁波绿宝环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the disposal of deep construction waste is mainly simple landfill and ocean dumping, which not only costs a lot, but also occupies land and damages the ecological environment.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Pre-drying: in the rain shelter facility, drain the water from the construction dregs, then air-dry until the soil moisture content drops to below 60wt%, and during the air-drying process, use mechanical turning to promote water evaporation;

[0032] (2) Sorting: Use a screen to remove stones and bricks with a particle size > 50mm in the pre-dried construction dregs;

[0033] (3) Dry heating treatment: The sorted construction dregs are subjected to dry heating treatment, using natural gas as the heat source. During the dry heating treatment, the thickness of the soil is 10cm, and the temperature of the dry heating treatment is 450°C , the heating time is 20min;

[0034] (4) Grinding: Grinding the construction dregs after dry heating treatment with a ball mill, the soil particles after grinding are ≤10mm.

[0035] Five batches of raw construction dregs were selected and processed according to steps (1) to (4) respectively. The physical and chemical properties of the...

Embodiment 2

[0041] Other conditions are the same as in Example 1, only the temperature of the dry heating treatment is controlled to 4 temperature gradients of 300-400°C, 400-500°C, 500-600°C, and 600-700°C respectively; , control the temperature in the device through the amount of air injection and oxygen amount, control the temperature within the above range respectively, test the time required for the water content of the soil to drop below 20%, the water content of the used construction dregs is 50-55% .

[0042] The experimental results show that when the dry heating temperature is 300-400°C, the dry heating speed is slow, and the time required for the soil moisture content to drop below 20% is longer than 1h, and the treatment effect is too low; when the temperature is >500°C, Construction dregs are easily fired into bricks during dry heating, and this phenomenon is more obvious when the temperature is >600°C. When the temperature is controlled at 400-500°C, the time required for t...

Embodiment 3

[0044] In order to prove the feasibility of the application of dry construction dregs in landscaping, a landscaping planting experiment was carried out from June 2019 to May 2020. The conventional method was used to plant 100 plants of each of the 5 kinds of landscaping plants, with no The seedlings were replenished, and the survival rate and plant height of the plants were investigated on May 10, 2020.

[0045] Experimental design: treatment 1: dry construction dregs, soil layer 30cm; treatment 2: use yellow mud as control soil, soil layer 30cm.

[0046] The results obtained are shown in Table 2.

[0047] Table 2 Survey Form for Landscaping Utilization of Dried Construction Waste

[0048]

[0049] According to the results in Table 2, it can be seen that the average survival rate is slightly higher than that of yellow mud planting, and the average plant height is also higher than that of yellow mud planting by using dry construction dregs for landscaping planting. Soil ca...

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Abstract

The invention relates to the technical field of construction waste treatment, and provides a treatment method of construction waste. The treatment method comprises the following steps: sequentially carrying out pre-drying, sorting, dry heating treatment and grinding on the construction waste to obtain dried construction waste. According to the treatment method provided by the invention, the physical properties of the construction waste are changed through dry heating treatment, the water content of the soil is rapidly reduced, the granular structure of the soil is changed, the soil texture ischanged from clay to loam, and pathogenic microorganisms and weed seeds can be thoroughly killed through dry heating treatment; and the obtained dried construction waste meets the standard of green planting soil, and can be used as planting soil. The method provided by the invention can simultaneously solve the problem that the construction waste is difficult to treat and the problem of lack of planting soil resources in the urban landscaping construction process, realizes resource utilization of the construction waste, and does not generate environmental pollution.

Description

technical field [0001] The invention relates to the technical field of construction dregs processing, in particular to a processing method for construction dregs. Background technique [0002] Construction slag refers to construction waste and engineering slag generated in construction projects. In the process of urban construction, a large amount of construction slag will be generated due to the development of key projects such as subway tunnels, transportation hubs, and commercial complexes. How to properly dispose of construction debris has become a serious problem facing urban development. [0003] Most of the construction waste comes from deep underground soil, which has the characteristics of high soil moisture content and high viscosity, so it cannot be directly used, especially in coastal plain areas. At present, the disposal of deep construction waste is mainly simple landfill and ocean dumping, which not only costs a lot, but also occupies land and damages the eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/06B02C21/00
CPCB09C1/00B09C1/06B02C21/00
Inventor 吴宝定金树权韩永江朱诗君吴秋玲汪峰
Owner 宁波绿宝环保科技有限公司
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