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A kind of sewage sludge environment-friendly burning-free brick and its preparation method

An environmentally friendly, non-burning brick technology, used in sustainable waste treatment, solid waste management, climate sustainability, etc. Brick products are unstable in performance, prone to cracks or corners, etc., to avoid pollution transfer and secondary pollution, facilitate stirring and molding, and improve compressive and flexural strength, wear resistance, and freeze-thaw resistance.

Active Publication Date: 2020-11-27
武汉鹏森环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pretreatment process of sludge and sludge in this invention is very complicated, and the performance of the sintered bricks produced by its additives is unstable, and cracks or corners are prone to appear.
[0005] To sum up, the burn-free bricks prepared by using sludge / sludge currently take a long time, the product weight is unstable, the flexural strength, compressive strength, wear resistance and freeze-thaw resistance are difficult to meet the requirements, and the production process is not mature enough. Due to problems such as long processing time, high energy consumption and unstable product performance, further in-depth research on the use of sludge / silt to prepare unburned bricks is urgently needed

Method used

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  • A kind of sewage sludge environment-friendly burning-free brick and its preparation method

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preparation example Construction

[0023] As a preferred embodiment, the preparation method of unfired bricks described in the following examples and comparative examples all include the following steps: 1. Measure the raw materials into the stirring container in sequence according to weight percentage; 2. Add 2 ~20% water is stirred and mixed evenly to obtain the mixture; Ⅲ. The mixture is pressed and formed by a hydraulic press to obtain bricks; Ⅳ. The formed bricks are first heated to 160-200°C under 0.62-1.57MPa and then steamed at a constant temperature for 4-8 hours; Ⅴ . Naturally lowering the temperature to prepare the sludge-environment-friendly non-burning brick. The process of the invention is simple and efficient, not affected by the temperature and humidity of the outside weather, the autoclave time is less than 12 hours, the temperature is moderate at 160-200°C, and the performance of the final product brick is stable.

[0024] The inventors found that adjusting within the parameters defined by the...

Embodiment 1

[0027] A sewage sludge environment-friendly burning-free brick, comprising the following raw materials in weight percentage: 40% of waste mud, 15% of coarse sand, 15% of silicon-aluminum-iron-calcium oxide, 10% of stone powder, 10% of quicklime, and 10% of gypsum;

[0028]Wherein, the waste sludge is treated with a special curing agent with a water content of 4%, and then filtered, dried, and roller-milled and then passed through a 100-mesh sieve; the silicon-aluminum-iron-calcium oxidized The substance is fly ash.

[0029] The special curing agent is a mixture of calcium oxide, cement, polyacrylamide and chitosan, and the content of chitosan is 3%.

[0030] The particle size of the silicon-aluminum-iron-calcium oxide is less than or equal to 1mm; the particle size of more than 80% of the coarse sand is 0.5-1mm; the stone powder is composed of discarded concrete, crushed stone or stone powder brick, and its particle size is between 3 ~ 7mm, the mud content is less than 2%.

...

Embodiment 2

[0033] A kind of sewage sludge environment-friendly burning-free brick, including the following raw materials in weight percentage: waste mud 50%, coarse sand 5%, silicon aluminum iron calcium oxide 22%, stone powder 8%, quicklime 13%, gypsum 2%;

[0034] Wherein, the waste sludge is treated with a special curing agent with a water content of 7%, and then passed through a 100-mesh sieve after pressure filtration, drying and roller grinding. The sugar content is 5%; the silicon-aluminum-iron-calcium oxide is fine coal slag.

[0035] The particle size of the silicon-aluminum-iron-calcium oxide is less than or equal to 1mm; the particle size of more than 80% of the coarse sand is 0.5-1mm; the stone powder is composed of discarded concrete, crushed stone or stone powder brick, and its particle size is between 3 ~ 7mm, the mud content is less than 2%.

[0036] Others are the same as in Example 1.

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Abstract

The invention discloses sludge / mud environment-friendly type baking-free bricks. The sludge / mud environment-friendly type baking-free bricks are prepared from the following raw materials in percentageby weight: 30 percent to 60 percent of waste mud, 5 percent to 25 percent of rough sand, 5 percent to 25 percent of silicon aluminum calcium iron oxide, 2 percent to 20 percent of mountain flour, 2 percent to 20 percent of quicklime and 2 percent to 20 percent of gypsum, wherein the waste mud is sludge or / and mud; the silicon aluminum calcium iron oxide is one or a mixture of more of fly ash, fine coal slag, mineral slag powder and coal gangue. According to the sludge / mud environment-friendly type baking-free bricks disclosed by the invention, resource utilization of the sludge / mud can be realized; the raw material composition is simple and the cost is low; the product has the characteristics of high bending strength and compressive strength, good wearing resistance, strong freezing and thawing resisting capability and the like through the optimization of the raw material ratio; the leaching rate of heavy metal in the baking-free bricks is relatively low, and the baking-free bricks have no odor and are environmentally friendly and safe, so that large-scale batch production is easy to realize; the baking-free bricks can be applied to the fields of engineering construction includingmunicipal plaza pavement, sidewalk pavement, hydraulic engineering protection slopes and the like.

Description

technical field [0001] The invention relates to the technical field of burn-free bricks, in particular to a sludge-friendly burn-free brick and a preparation method thereof. Background technique [0002] A large amount of silt or sludge will be produced in my country's rapid urbanization, port construction and maintenance, river and lake construction and maintenance and other water conservancy projects. The commonly used sludge / sludge treatment methods include ocean dumping, stacking and drying, and nearby burial , It will cause river and ocean pollution, the spread of piled pollutants, and the occupation of cultivated land. For many years, my country has mainly used clay sintering to make bricks, using clay as the main raw material, destroying cultivated land, and the production of sintered clay consumes a lot of energy. Therefore, research on waste clay raw materials and use other new geotechnical materials, such as sludge or silt to prepare sintered bricks, It plays an imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/02C04B18/04
CPCY02W30/91
Inventor 杨珈乐王景芸
Owner 武汉鹏森环境科技有限公司
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