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Sewage treatment plant sludge sintered brick and preparation method thereof

A technology for sewage treatment plants and sintered bricks, applied in the field of sintered bricks, can solve the problems of large content of organic matter in sludge, low utilization efficiency of sludge, and low plasticity of raw materials.

Active Publication Date: 2013-09-18
上海鑫晶山淤泥研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Making bricks from urban sewage plant sludge is an effective sludge utilization method. However, the problem of using urban sewage plant sludge to make bricks is that the content of organic matter in sludge is large, the plasticity of raw materials is low, and the composition Unbalanced, difficult to form, low compressive strength and easy to crack, so a large amount of other ingredients need to be added during the preparation process, such as loess, sandstone and other modified materials, but this aspect reduces the amount of sludge added and Need to use a lot of ingredients, overall sludge utilization efficiency is not very high

Method used

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  • Sewage treatment plant sludge sintered brick and preparation method thereof
  • Sewage treatment plant sludge sintered brick and preparation method thereof
  • Sewage treatment plant sludge sintered brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare a sewage treatment plant sludge sintered brick, the ingredients (dry) are as follows:

[0027]

[0028] Preparation process steps:

[0029] (1) The river sludge is dehydrated into viscous sludge with a water content of 20wt%; at the same time, the sludge from domestic sewage treatment plants is dehydrated into a water content of 25wt%;

[0030] (2) Grinding coal gangue, dry powder additives and slag to a particle size of 0.1-3mm;

[0031] (3) Mix the above-mentioned processed materials according to the proportion;

[0032] (4) Then aging for 5 days until the total water content is 13wt%;

[0033] (5) Semi-hard extrusion into bricks, the molding pressure is controlled at 2.1-2.7MPa; drying, tunnel kiln roasting, heating up steadily, the heating rate is controlled at 2-4°C / min, after 7 hours of tunnel kiln firing at 900-950°C, Made out of the kiln. Peeling, hoarseness, and cracking are considered unqualified, and the yield rate is 98%; the prepared sintered...

Embodiment 2

[0037] Prepare a sewage treatment plant sludge sintered brick, the ingredients (dry) are as follows:

[0038]

[0039] Preparation process steps:

[0040] (1) The river sludge is dehydrated into viscous sludge with a water content of 30wt%; at the same time, the sludge from domestic sewage treatment plants is dehydrated into a water content of 35wt%;

[0041] (2) Grinding coal gangue, dry powder additives and slag to a particle size of 0.1-3mm;

[0042] (3) Mix the above-mentioned processed materials according to the proportion;

[0043] (4) Then aging for 7 days until the total water content is 18wt%;

[0044] (5) Semi-hard extrusion into bricks, the molding pressure is controlled at 2.1-2.7MPa; drying, tunnel kiln roasting, heating up steadily, the heating rate is controlled at 2-4°C / min, 900-950°C tunnel kiln roasting for 9 hours, It is made out of the kiln; peeling, mute, and cracking are considered unqualified, and the yield rate is 99%; the prepared sintered brick ...

Embodiment 3

[0048] Prepare a sewage treatment plant sludge sintered brick, the ingredients (dry) are as follows:

[0049]

[0050] Preparation process steps:

[0051] (1) The river sludge is dehydrated into viscous sludge with a water content of 22wt%; at the same time, the sludge from domestic sewage treatment plants is dehydrated into a water content of 28wt%;

[0052] (2) Grinding coal cinders, dry powder additives and slag to a particle size of 0.1-3mm;

[0053] (3) Mix the above-mentioned processed materials according to the proportion;

[0054] (4) Then aging for 6 days until the total water content is 15wt%;

[0055] (5) Semi-hard extrusion into bricks, the molding pressure is controlled at 2.1-2.7MPa; drying, tunnel kiln roasting, heating up steadily, the heating rate is controlled at 2-4°C / min, and after 8 hours of tunnel kiln firing at 900-950°C, Made out of the kiln. Peeling, hoarseness, and cracking are considered unqualified, and the yield rate is 99%; the prepared sin...

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Abstract

The invention relates to a sewage treatment plant sludge sintered brick. Sintering raw materials include the following components in the absolute dry state in parts by weight: 20-30 parts of riverway sludge or deep foundation pit soil, 25-35 parts of sewage treatment plant sludge, 20-30 parts of coal gangue or coal slag, 10-20 parts of dry powder additives and 5-10 parts of mineral slag and / or furnace slag. The preparation process comprises the following steps of: mixing the sintering raw materials in proportion, and aging for 5-7 days till the water content is 13-18 percent by weight; then carrying out semihard extrusion forming to make a green brick, and then drying; and then roasting through a tunnel kiln, stably increasing temperature for 2-4 DEG C / min, and slowly roasting at 900-1000 DEG C for 7-9 hours by adopting small fire. The obtained sintered brick meets the standard of a GB13544-2011 porous sintered brick and has good self-heat preservation effect without desquamation or cracking or hoarseness.

Description

technical field [0001] The invention relates to a fired brick, in particular to a sewage treatment plant sludge fired brick and a preparation method thereof. Background technique [0002] Sludge from urban sewage plants refers to the solid, semi-solid and liquid wastes produced by sewage treatment, containing a large amount of organic matter, rich in nutrients such as nitrogen and phosphorus, heavy metals, pathogenic bacteria and pathogenic bacteria, etc. Sludge pollutants have Long-term toxicity and non-degradability, if it is discharged and discarded without treatment, it will cause serious pollution to the environment. With the popularization of sewage treatment facilities, the improvement of treatment rate and the deepening of treatment degree, the amount of sludge produced is bound to increase greatly. How to properly dispose of sludge from sewage plants and effectively use it as a new resource to turn waste into treasure has become an important factor for urban sewage...

Claims

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Application Information

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IPC IPC(8): C04B30/00C04B18/30
CPCY02W30/91
Inventor 陈文光
Owner 上海鑫晶山淤泥研发有限公司
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