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A method for preparing a new type of permeable brick using river bottom mud

A technology for permeable bricks and bottom mud, which is applied in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., to accelerate construction, solve the problem of heavy metal pollution control, and achieve good permeability.

Active Publication Date: 2021-04-16
GUANGZHOU EP ENVIROMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the removed sediment contains a large amount of heavy metals. How to dispose of the contaminated sediment so that it no longer becomes pollution is a hot and difficult point in current research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a new type of permeable brick using river bottom mud, comprising the following steps:

[0034] S1. Bottom mud drying and crushing treatment: remove the bottom mud from the river bed, dry it to make the water content 10%, remove the larger particles and impurities, and then crush it with a pulverizer, and the crushed particle size is over 200 Mesh sieve;

[0035] S2. Prepare bottom mud-dry mixture: crush cement, fly ash and apatite to make dry mixture, add the gained dry mixture to the bottom mud described in S1, stir and mix, the cement, pulverized coal The mass-number ratio of ash, apatite and bottom mud is 5:20:18:57;

[0036] S3. Preparation of nano-zero-valent iron suspension loaded ceramsite: mix rhamnolipid solution, ferric chloride solution and sodium borohydride at a volume ratio of 2:1:1 to obtain rhamnolipid-coated nano-zero-valent iron Suspension, the suspension is sprayed on the surface of the ceramsite as a stabilizer, the particle ...

Embodiment 2

[0042] A method for preparing a new type of permeable brick using river bottom mud, the steps are basically the same as in Example 1, the difference is that the water content of the S1 bottom mud is 20%, and the crushed particle size is 60 mesh sieve;

[0043] Cement, fly ash described in S2, the mass and number ratio of apatite and bottom mud is 10:20:10:50;

[0044] The particle size of S3 ceramsite is 2 cm, the dry basis weight is 1 g, and the porosity is 80%. The rhamnolipid solution, ferric chloride solution and sodium borohydride are set aside at a volume ratio of 2:1:1 for 5 minutes. The concentration of rhamnolipid solution is 3 g / L, the concentration of ferric chloride solution is 24 g / L, and the concentration of sodium borohydride is 20 g / L;

[0045] Among them, the ceramsite described in S3 is prepared by the following steps: mix the bottom sludge raw material powder, fly ash and zeolite powder in the above S1 at a mass ratio of 2:1.2:1, add water to stabilize the s...

Embodiment 3~6

[0053] A method for preparing a new type of permeable brick using river bottom mud, the steps are basically the same as in Example 1, and the specific parameters are shown in Table 2.

[0054] serial number Mass ratio of cement, fly ash, apatite and bottom mud Mass ratio of ceramsite to sediment-dry mixture Aging temperature / ℃ Aging pressure / kPa Aging time / min Compression time / s Pressure / kN Oxidation time / day Example 3 10:10:20:60 1:1 25 101 20 30 20 10 Example 4 8:15:10:30 1:1 25 101 20 30 100 10 Example 5 5:30: 8:50 1:1 18 70 20 30 100 20 Example 6 20:10:8:30 2:1 25 101 20 60 100 10

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Abstract

The invention discloses a method for preparing a novel permeable brick by using river bottom mud. The method comprises the following steps: pulverizing cement, fly ash and apatite to obtain a dry mixture, mixing and stirring the obtained dry mixture, bottom mud and nano-zero-valent iron suspension-loaded ceramsite, adding water, and pressing after aging Obtain brick embryos, sprinkle water and maintain them naturally to obtain new permeable brick finished products. The method of the present invention makes full use of the bottom mud of rivers, realizes the resource utilization of solid waste, solves the cost problem caused by sludge accumulation and treatment, and adds the ceramsite of zero-valent nano-iron suspension wrapped in rhamnolipid, It can passivate the heavy metals in the sludge and fix them in the new permeable bricks, which solves the problem of heavy metal pollution in the river sediment to a certain extent. The prepared new permeable brick has good permeability, high strength, does not need to be roasted, reduces production energy consumption, and contains multifunctional ceramsite inside, which can not only passivate heavy metals, but also absorb water and other harmful substances. Good bricks are laid on sidewalks or used to build walls along rivers, which is of great significance for accelerating the construction of sponge cities.

Description

technical field [0001] The invention relates to the technical field of sponge cities, and more particularly relates to a method for preparing novel permeable bricks by using river bottom mud. Background technique [0002] In recent years, the central government has attached great importance to the problem of urban rain and floods and the comprehensive improvement of urban water environment. From the perspective of promoting the construction of "sponge cities", it has proposed to use low-impact development methods to treat black and odorous water bodies in urban rivers according to local conditions, so as to effectively alleviate urban waterlogging. , Protect and improve the urban water ecological environment. Due to structural changes in the land use pattern during the urbanization process, the original permeable areas (farmland, forest, grassland) are constantly replaced by concrete buildings, asphalt pavement, etc., resulting in excessive hardening of the underlying surfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/02B28B3/00B28C5/00
CPCB28B3/00B28C5/003C04B20/023C04B28/00C04B2111/00017C04B2111/00284C04B18/08C04B14/366C04B18/0418C04B18/027
Inventor 王文静阳重阳曹姝文李锐敬许嘉辉刘小平谢永新姜春晓
Owner GUANGZHOU EP ENVIROMENTAL ENG
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