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A method for firing sponge bricks using sludge and silt

A technology of sponge bricks and silt, applied in the field of building materials, can solve the problems of limited use of clay materials, high cost and other problems, and achieve the effects of high strength, resource saving and smooth surface of bricks

Active Publication Date: 2019-03-01
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing brick firing process, clay (including coal gangue and shale powder) is used as the main raw material. Under the policy of "limiting stickiness and banning solids", the use of clay materials is greatly restricted
The commonly used high-permeability permeable bricks are mainly made of ceramics or coarse-grained cement materials, which cost a lot of money.

Method used

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  • A method for firing sponge bricks using sludge and silt
  • A method for firing sponge bricks using sludge and silt
  • A method for firing sponge bricks using sludge and silt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method of using sludge and sludge to make sponge bricks, the steps are as follows:

[0028] S1. Stir the sludge, sludge and cement at a speed of 300r / min for 5 minutes; add water glass to the mixture and continue to stir at the same speed for 10 minutes;

[0029] S2. Send the evenly stirred mixture into the brick making machine and press it into bricks;

[0030] S3, curing the obtained green body at room temperature for 3 days, and putting the green body in a drying room for 12 hours, the temperature of the drying room is 100°C;

[0031] S4. During the roasting process of the dried green body, the temperature is set to 1050℃, and the organic matter in the sludge is completely burned out after sintering for 6 hours; the sponge brick is made.

[0032] Among them, the mass fraction of each ingredient (wet weight) is:

[0033]

[0034] The water content of urban domestic sludge is 81%, and the water content of sludge is 65%.

[0035] Ordinary Portland cement is labeled OPC32.5.

[003...

Embodiment 2

[0041] A method of using sludge and sludge to make sponge bricks, the steps are as follows:

[0042] S1. Stir the sludge, sludge and cement at a speed of 350r / min for 6 minutes; add water glass to the mixture and continue to stir at the same speed for 12 minutes;

[0043] S2. Send the evenly stirred mixture into the brick making machine and press it into bricks;

[0044] S3, curing the obtained green body at room temperature for 3 days, and putting the green body in a drying room for 12 hours, the temperature of the drying room is 100°C;

[0045] S4. During the roasting process of the dried green body, the temperature is set to 1050℃, and the organic matter in the sludge is completely burned out after sintering for 6 hours; the sponge brick is made.

[0046] Among them, the mass fraction of each ingredient (wet weight) is:

[0047]

[0048] The water content of urban domestic sludge is 72%, and the water content of sludge is 62%.

[0049] Ordinary Portland cement is labeled OPC32.5.

[005...

Embodiment 3

[0055] A method of using sludge and sludge to make sponge bricks, the steps are as follows:

[0056] S1. Stir the sludge, sludge, and cement at a speed of 350r / min for 8 minutes; add water glass to the mixture and continue to stir at the same speed for 15 minutes;

[0057] S2. Send the evenly stirred mixture into the brick making machine and press it into bricks;

[0058] S3, curing the obtained green body at room temperature for 3 days, putting the green body in a drying chamber for 12 hours, and the temperature of the drying chamber is 98°C;

[0059] S4. During the roasting process of the dried green body, the temperature is set to 1050°C, and the organic matter in the sludge is completely burned out after 8 hours of sintering; the sponge brick is made.

[0060] Among them, the mass fraction of each ingredient (wet weight) is:

[0061]

[0062] The water content of urban domestic sludge is 81%, and the water content of sludge is 65%.

[0063] Ordinary Portland cement is labeled OPC32.5....

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Abstract

The invention discloses a method for firing a sponge brick from sludge and silt. The method comprises the following steps: S1. uniformly stirring dewatered sludge, silt, cement and water glass; S2. sending the uniformly stirred mixture into a brick making machine, and pressing to obtain a green brick; S3. curing the green brick at room temperature, and drying; and S4. putting the dried green brick into a kiln, and carrying out sintering to obtain the sponge brick. The sponge brick is prepared from 30-70 wt% of dewatered sludge, 10-50 wt% of silt, 3-10 wt% of cement and 1-5 wt% of water glass. According to the method, the sponge brick is prepared by mainly firing municipal sewage plant dewatered sludge and dredging silt, has favorable water permeability, can satisfy the requirement for sidewalk roadbed strength, and has the functions of moisture retention and heat reduction.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a method for making sponge bricks by using sludge and sludge. Background technique [0002] The development of cities and the reduction of wetlands and green spaces have caused many problems in cities. In heavy rains, limited drainage measures caused waterlogging in some parts of the city, which seriously affected the travel safety of residents and brought various uncertainties to the development of the city. The impervious road blocks the infiltration of rainwater, causing rainwater to be discharged only through special collection wells and rainwater pipes. This kind of drainage system does not satisfy the drainage work under extreme heavy rain. [0003] Reinforced concrete buildings, cement roads, etc. have an important impact on the heat island effect of the city. Urban underlying surfaces, such as concrete roads, asphalt roads, etc., have low specific heat a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/132C04B38/06
CPCC04B33/1321C04B38/0665Y02P40/60
Inventor 朱伟范惜辉苏瑛林乃喜王辰宇黄俊杰吴思麟徐浩青王升位
Owner HOHAI UNIV
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