Preparation method for bottom mud brick

A technology of bottom mud and river bottom mud, which is applied in environmental engineering and fields, can solve problems such as pollution and non-compliance with the requirements of sustainable development strategies, and achieve the effects of low energy consumption, high strength, and low dissolution

Inactive Publication Date: 2012-12-19
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing brick-making technology, clay is used as the main raw material for sintering to make bricks. The raw material used is clay, which is a large an...

Method used

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  • Preparation method for bottom mud brick

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 Preparation of Bottom Mud Bricks

[0031] The preparation method of bottom mud brick in the present embodiment may further comprise the steps:

[0032] Firstly, the river bottom mud is used as raw material, after dehydration, drying and crushing, the bottom mud, plant straw, waste glass powder, and binder are mixed in a ratio of 70:1:5:1, and then 5% steel slag is added to fully Mix evenly, add water to adjust the moisture content to 20%, stir evenly, beat for homogenization, pressurize and press with a brick mold. The suitable mixing ratio in the present invention is: bottom mud: plant straw: waste glass powder: binder is 70-90: 0.1-3: 5-15: 0.1-10, and steel slag is added, and steel slag accounts for the total of the aforementioned mixing components. 5% of the weight. Moisture content can be adjusted in the range of 20-40%.

[0033]The river sediment used is the surface sediment and shallow sediment above the hard mud at the bottom of the polluted river c...

Embodiment 2

[0038] Example 2 Determination of heavy metal leaching of bottom mud bricks

[0039] The bottom mud bricks of the present invention prepared according to the method of Example 1 are used as building materials to pave roads, and will not dissolve harmful substances such as heavy metals after soaking in rainwater, will not cause water pollution, and will not endanger human health. The experimental results are shown in Table 1, showing that the heavy metal leaching rate of the bottom mud brick of the present invention is within the specified limit.

[0040]

[0041] In this example, two different leaching solutions were used for leaching by flipping and vibrating, namely, a solution of pH=3.2 prepared by sulfuric acid and nitric acid at a volume ratio of 3:2 and an acetic acid buffer solution of pH=4.93 (refer to the standard HJT299-2007 and standard HJT300-2007). It can be seen from Table 1 that the leaching concentration of heavy metals in the bottom mud bricks of the prese...

Embodiment 3

[0042] Example 3 Toxicity Analysis of Bottom Mud Brick Leachate

[0043] Use fully aerated distilled water to extract by shaking at a solid-to-liquid ratio of 1:4, expose the Xenopus laevis embryos to the extract of bottom mud bricks and raw bottom mud of the present invention for 48 hours, and observe their development status, (such as figure 1 Shown sample numbers S-1 to S-9 are brick samples worth within the proportioning range given by the present invention, and sample number S-10 is the raw material bottom mud), and the experimental results show that it is exposed to the raw material bottom mud extract The deformity rate of embryos is obviously higher than that exposed to the brick samples of the present invention, and the deformity rate of embryos exposed to the extract of the raw material bottom mud is as high as 90%, while the deformity rate of embryos exposed to the bricks of the bottom mud of the present invention is lower than 20%. It can be seen that the biotoxicit...

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Abstract

The invention discloses a preparation method for a bottom mud brick. Riverway bottom mud serves as a raw material, the riverway bottom mud, plant straws, waste glass powder and a binding agent are mixed in proportion, and the preparation method comprises the following steps that: steel slag is added for evenly mixing; a moisture content is adjusted to be 20-40%, even stirring and beating homogenizing are carried out, and a brick making die is used for pressing and compression molding; the moisture content is adjusted to be 1-5% in a dried mode; and the bottom mud brick is made through high-temperature calcination of a muffle furnace. The bottom mud brick prepared by the method is high in strength, good in water permeability, multiple in hole, less in energy dissipation, less in heavy metal dissolution and low in biotoxicity. The preparation method utilizes bottom mud of heavy-polluted riverways, therefore, solidification of heavy metals in polluted bottom mud is achieved, damage of the bottom mud to environment is reduced, and simultaneously, resource recycling of the bottom mud is achieved.

Description

technical field [0001] The invention belongs to the field of environmental engineering and technology, and relates to a novel environment-friendly building material and a preparation method thereof, in particular to a preparation method of bottom mud bricks. Background technique [0002] Sediment is the long-term accumulated sediment at the bottom of rivers, lakes, reservoirs and other water bodies. It is an important part of the multi-phase ecosystem of water bodies and the place where environmental pollutants gather in a wide space and for a long time. With the introduction of sewage interception projects, the secondary pollution of sediment has become a problem that affects the wide application of sediment dredging engineering technology, so the treatment and disposal of river sediment has become a common concern. [0003] The construction industry is a large industry that consumes energy and resources. It has an inseparable connection and role with resources and the envi...

Claims

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Application Information

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IPC IPC(8): C04B28/26C04B38/06C04B18/24
CPCY02W30/91
Inventor 陈丽黄民生宋力顾敦罡朱先征黄勤超童敏
Owner EAST CHINA NORMAL UNIV
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