Method for utilizing urban life sewage sludge to product cement road bricks

A technology of urban domestic sewage and sludge, which is applied in the field of cement products, can solve the problems of secondary pollution of the environment, high water content, and inability to meet the sludge treatment of urban sewage plants, etc.

Inactive Publication Date: 2014-12-03
JIANGSU GUOZHEN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's economy, the discharge of urban domestic sewage is increasing, and the sewage treatment capacity and sewage treatment rate are also increasing. The domestic sewage sludge production of sewage treatment plants is also increasing accordingly. Sludge is used as sewage The by-products of the treatment, if not treated in time, will cause serious secondary pollution
Due to the large amount of sludge production, high water content, and a large amount of organic matter, germs, parasites, and heavy metals, if it is not handled properly, it will bring serious secondary pollution to the environment.
Traditional sludge treatment methods such as landfill, sludge composting, agricultural use and sludge incineration have been unable to meet the treatment of sludge from urban sewage plants. The resource utilization of sludge has become the most effective way to completely eradicate sludge. Therefore, how to reduce the output It has become a research hotspot at home and abroad to properly and safely treat huge sludge with high moisture content and complex components, make it harmless, reduce its volume, and finally achieve resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for producing cement from urban domestic sewage sludge comprises the following steps:

[0031] 1) Transport 500 kg of domestic sewage sludge from urban sewage treatment plants with a water content of 85% into the mixer, and add 225 kg of gypsum powder into the mixer, mix evenly to make lime gypsum, and transport it to the granulator Make dispersed gray gypsum particles, the particle size of gray gypsum particles is 25-30 mm;

[0032] 2) Send the gray gypsum particles into the far-infrared high-temperature furnace for high-temperature drying at a temperature of 800°C, and send them to the storage bin after cooling;

[0033] 3) Mix 350 kg of gray gypsum particles with 80 kg of slag, 500 kg of cement clinker, and 70 kg of fly ash and stir evenly to form a 1000 kg mixture;

[0034] 4) Send the above-mentioned mixture into a pulverizer for crushing and grinding, and screen through a 820-850 mesh screen to make cement.

[0035] 5) Add the cement and yellow sand m...

Embodiment 2

[0040] The method for producing cement from urban domestic sewage sludge comprises the following steps:

[0041] 1) Transport 500 kg of domestic sewage sludge from urban sewage treatment plants with a moisture content of 90% into the mixer, and add 250 kg of gypsum powder into the mixer, mix evenly to make lime gypsum, and transport it to the granulator Make dispersed gray gypsum particles, the particle size of gray gypsum particles is 15-20 mm;

[0042] 2) Send the gray gypsum particles into the far-infrared high-temperature furnace for high-temperature drying at a temperature of 890°C, and send them to the storage bin after cooling;

[0043] 3) Mix 300 kg of gray gypsum particles with 90 kg of slag, 570 kg of cement clinker, and 40 kg of fly ash and stir evenly to form a 1000 kg mixture;

[0044] 4) Send the above-mentioned mixture into a pulverizer for crushing and grinding, and screen through a 820-850 mesh screen to make cement;

[0045] 5) Add the cement and yellow san...

Embodiment 3

[0049] The method for producing cement from urban domestic sewage sludge comprises the following steps:

[0050] 1) Transport 500 kg of domestic sewage sludge from urban sewage treatment plants with a moisture content of 95% into the mixer, and add 275 kg of gypsum powder into the mixer, mix evenly to make lime gypsum, and transport it to the granulator Make dispersed gray gypsum particles, the particle size of gray gypsum particles is 30-35 mm;

[0051] 2) Send the gray gypsum particles into the far-infrared high-temperature furnace for high-temperature drying at a temperature of 850°C, and send them to the storage bin after cooling;

[0052] 3) Mix 390 kg of gray gypsum particles with 50 kg of slag, 470 kg of cement clinker, and 90 kg of fly ash and stir evenly to form a 1000 kg mixture;

[0053] 4) Send the above-mentioned mixture into a pulverizer for crushing and grinding, and screen through a 820-850 mesh screen to make cement.

[0054] 5) Add the cement and yellow san...

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Abstract

A related method for utilizing urban life sewage sludge to product cement road bricks comprises the following steps: uniformly stirring lift sewage sludge with gypsum powder in a stirring machine to prepare grey gypsum and preparing grey gypsum particles; performing high-temperature drying on the grey gypsum particles in afar-infrared high-temperature furnace; mixing the grey gypsum particles with mineral slag, cement clinker and fly ash according to a ratio and stirring uniformly; crushing the mixed material, grinding and screening to prepare cement; adding water into the cement prepared in the above steps and yellow sand according to a ratio, and stirring uniformly; and preparing bricks from the mixed material through cutting forming, drying the bricks with steam, and maintaining at normal temperature to prepare the cement road bricks. By producing the cement road bricks from the urban life sewage sludge, the road bricks are high in strength and good in durability, effective utilization of urban life sewage sludge is realized, secondary pollution of urban life sewage sludge to environment is mitigated, and the harmless, quantity-reducing recycling utilization purposes of urban life sewage sludge are realized.

Description

technical field [0001] The invention relates to a method for producing cement products by utilizing waste, in particular to a method for producing cement road bricks by utilizing urban domestic sewage sludge. Background technique [0002] With the rapid development of my country's economy, the discharge of urban domestic sewage is increasing, and the sewage treatment capacity and sewage treatment rate are also increasing. The domestic sewage sludge production of sewage treatment plants is also increasing accordingly. Sludge is used as sewage The by-products of the treatment will cause serious secondary pollution if they are not treated in time. Due to the large amount of sludge production, high water content, and a large amount of organic matter, germs, parasites, and heavy metals, if improperly disposed of, it will bring serious secondary pollution to the environment. Traditional sludge treatment methods such as landfill, sludge composting, agricultural use and sludge incin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B28/00
CPCY02P40/10
Inventor 张国华
Owner JIANGSU GUOZHEN ENVIRONMENTAL PROTECTION TECH
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