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Baking-free bricks prepared through heavy-metal-polluted bottom mud

A technology for polluting sediment and burning-free bricks is applied in the field of preparation of building bricks or blocks, which can solve problems such as adverse effects on the human body of the land ecological environment, and achieve the effects of high cost performance, low energy consumption and high efficiency

Active Publication Date: 2017-03-22
江苏东方生态清淤工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treated sludge generally still contains some harmful substances such as pathogenic bacteria and heavy metals, and the long-term use of sludge may have adverse effects on the land ecological environment and even the human body
Therefore, there is a certain risk in land use of sludge

Method used

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  • Baking-free bricks prepared through heavy-metal-polluted bottom mud
  • Baking-free bricks prepared through heavy-metal-polluted bottom mud
  • Baking-free bricks prepared through heavy-metal-polluted bottom mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 1 The process shown is to prepare unburned bricks, and the specific steps include:

[0026] (1) Add 3870g of heavy metal-contaminated bottom mud (water content 50%), 3870g of gravel (5-10mm in particle size), and 1935g of composite curing agent into the mixer, and mechanically stir evenly to obtain a premix;

[0027] (2) The premixed material processed in step (1) is sent into the brick making machine through the conveyor, extruded and formed, and on the blank cutting platform, the blank is cut to form a brick;

[0028] (3) The adobes are placed in the drying yard to dry naturally for 8 days. During the drying process, the adobes are watered and maintained with warm water at 40°C every morning. The strength and heavy metal leaching of the obtained unburned bricks are shown in Tables 1 and 2, respectively.

[0029] The composite curing agent is composed of Portland cement, modified fly ash, water reducer and chelating agent, wherein Portland cement 1800...

Embodiment 2

[0032] refer to figure 1 The process shown is to prepare unburned bricks, and the specific steps include:

[0033] (1) Add 2709g of heavy metal-contaminated bottom mud (water content 50%), 4063.5g of gravel (5-10mm in particle size), and 2257.5g of composite curing agent into the mixer, and mechanically stir evenly to obtain a premix;

[0034] (2) The premixed material processed in step (1) is sent into the brick making machine through the conveyor, extruded and formed, and on the blank cutting platform, the blank is cut to form a brick;

[0035] (3) The adobes are placed in the drying yard to dry naturally for 10 days. During the drying process, the adobes are watered and maintained with warm water at 30°C every morning. The strength of the unburned bricks obtained is shown in Table 1. The bricks were divided into 2, and heavy metal leaching was tested. The test results are shown in Table 3.

[0036] The composite curing agent is composed of Portland cement, modified fly a...

Embodiment 3

[0039] refer to figure 1 The process shown is to prepare unburned bricks, and the specific steps include:

[0040] (1) Add 3160.5g heavy metal contaminated bottom mud (water content 50%), 3612g aggregate, 2257.5g composite curing agent into the mixer, mechanically stir evenly, and prepare the premix;

[0041] (2) The premixed material processed in step (1) is sent into the brick making machine through the conveyor, extruded and formed, and on the blank cutting platform, the blank is cut to form a brick;

[0042] (3) The adobes are placed in the drying yard to dry naturally for 12 days. During the drying process, the adobes are watered and maintained with warm water at 20°C every morning. The strength of the unburned bricks obtained is shown in Table 1.

[0043] The composite curing agent is composed of Portland cement, modified fly ash, water reducing agent and chelating agent, wherein Portland cement is 2100g, modified fly ash is 105g, water reducing agent is 21g, and chela...

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Abstract

The invention discloses baking-free bricks prepared through heavy-metal-polluted bottom mud. A preparation method of the baking-free bricks includes the following steps that firstly, 30% to 40% of the heavy-metal-polluted bottom mud, 40% to 45% of aggregate and 20% to 25% of a composite curing agent are added to a stirring machine to be mechanically stirred evenly to obtain a premix; secondly, the premix treated through the first step is conveyed into a brick making machine through a conveyor, extrusion forming is conducted, and cutting is conducted on a green brick cutting table to form green bricks; and thirdly, the green bricks are stacked on a sunning ground to be naturally sunned for a week or more, in the sunning process, the green bricks are watered and maintained through warm water with the temperature ranging from 20 DEG C to 40 DEG C every morning, and the baking-free bricks are prepared. According to the baking-free bricks, the polluted mud is used, clay resources are saved, environment pollution and land occupation due to a mud storage yard are reduced, meanwhile, resource utilization of the mud is achieved, and the sustainable development of the nation is facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of building bricks or building blocks, in particular to an unfired brick prepared by utilizing heavy metal polluted bottom mud. Background technique [0002] In recent years, the water quality of lakes and rivers has been polluted, and the pollutants in the sediment sediments have accumulated seriously, and the contents of nitrogen, phosphorus, and organic matter are relatively high. At the same time, the heavy metals entering the environment enter the water body through various channels, most of which are quickly transferred from the water phase to the solid phase, and are combined into suspended particles such as particles in the water and sediments such as bottom mud. The removal of polluted sediment is a relatively direct and effective method to control water pollution. However, the removed bottom mud contains a large amount of heavy metal pollution. How to dispose of the polluted mud so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B2201/50C04B18/08C04B2103/302C04B22/14C04B14/02C04B18/0472
Inventor 吴玲玲高扬罗荣彪孙科顾晓慧朱伟袁坤坤王浩霍雷张杰钱忆佳
Owner 江苏东方生态清淤工程有限公司
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