Method for preparing baking-free ecological bricks from chemical and residual sludge as well as prepared product

A technology of surplus sludge and ecological bricks, which is applied in the direction of ceramic products, other household utensils, household utensils, etc., can solve the problems of complex composition and high moisture content of chemical surplus sludge, and achieve large processing capacity, high strength and operability strong effect

Inactive Publication Date: 2016-05-25
NJTECH ENVIRONMENT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical surplus sludge has high moisture content, complex composition, and contains various organic toxins, heavy metals and pathogenic microorganisms, etc.

Method used

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  • Method for preparing baking-free ecological bricks from chemical and residual sludge as well as prepared product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The remaining chemical sludge was dried at 120°C for 6 hours to obtain dried sludge, and the dried sludge was incinerated with oxygen at 1150°C for 1 hour, and passed through a 100-mesh sieve after cooling to obtain ash. According to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the leaching concentration of heavy metals in the chemical residue sludge incineration ash was determined. The test results are shown in Table 1.

[0027] Table 1 Concentration of heavy metals leached from chemical residual sludge incineration ash (mg / l)

[0028]

[0029] Heat the kaolin at 800°C, calcinate for 2 hours, and cool to obtain metakaolin.

[0030] Take 60g of ash and 40g of metakaolin and stir evenly; add 8.8g of sodium hydroxide, 8.8g of sodium silicate and 8g of water, stir in a mixer, and mix thoroughly to obtain a slurry; squeeze the mixed slurry into a 16mm× 16mm×20mm rectangular parallelepiped test piece, and sent to th...

Embodiment 2

[0032] Take the remaining chemical sludge and dry it at 120°C for 6 hours to obtain dried sludge. The dried sludge is incinerated with oxygen at 1150°C for 1 hour. After cooling, it passes through a 100-mesh sieve to obtain ash; keep kaolin at 800°C for 2 hours. , cooled to obtain metakaolin. Take 60g of ash and 40g of metakaolin and stir evenly; add 7.2g of sodium hydroxide, 7.2g of sodium silicate and 10g of water, stir in a mixer, and mix thoroughly to obtain a slurry; squeeze the mixed slurry into a 16mm× 16mm×20mm rectangular parallelepiped test piece, and sent to the drying oven, 80 ℃ curing 23h; take out the sample demoulding, continue curing 7d at 80 ℃, to get chemical residue sludge-based non-burning ecological brick. After testing, the compressive strength is 14.78MPa.

Embodiment 3

[0034] Take the remaining chemical sludge and dry it at 120°C for 6 hours to obtain dried sludge. The dried sludge is incinerated with oxygen at 1150°C for 1 hour. After cooling, it passes through a 100-mesh sieve to obtain ash; keep kaolin at 800°C for 2 hours. , cooled to obtain metakaolin. Take 60g of ash and 40g of metakaolin and stir evenly; add 9.6g of sodium hydroxide, 9.6g of sodium silicate and 10g of water, stir in a mixer, and mix thoroughly to obtain a slurry; squeeze the mixed slurry into a 16mm× 16mm×20mm rectangular parallelepiped test pieces, and sent to the drying oven, 60 ℃ curing 23h; take out the sample demoulding, at 60 ℃ to continue curing 7d, that is, chemical residue sludge-based non-fired ecological bricks. After testing, the compressive strength is 13.98MPa.

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Abstract

The invention discloses a method for preparing baking-free ecological bricks from chemical and residual sludge as well as a prepared product. Residual sludge incineration ash and metakaolin are mixed according to a certain proportion with uniformly stirring, a mixture is obtained, sodium hydroxide, sodium silicate and water are added, a mixer is used for stirring and fully mixing, and slurry is obtained; the mixed slurry is extruded and injected into a cuboid test piece of a certain specification, and the test piece is sent to a drying oven for maintenance; the test piece is taken out for demoulding, maintenance is continuously carried out for 7 days at 20-80 DEG C, and residual sludge based baking-free ecological bricks are prepared. The ecological bricks are light and porous with large strength, and construction control is convenient. The bricks are hopeful to be used for river channels in chemical industry park, ecologic slope protection of landscape rivers and ecological paving bricks in park, and the like.

Description

technical field [0001] The invention belongs to the field of resource disposal of industrial waste, and relates to a method for preparing non-burning ecological bricks from residual chemical sludge and the prepared products. Background technique [0002] Chemical surplus sludge is the solid waste produced in the process of chemical wastewater treatment in sewage treatment plants. The residual chemical sludge has high water content and complex composition, including various organic poisons, heavy metals and pathogenic microorganisms. According to the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Waste", the residual chemical sludge must be properly treated, especially the heavy metals in the sludge must be stabilized before being discharged. At present, there are hundreds of chemical industry parks and hundreds of thousands of chemical enterprises in my country, which produce a huge amount of chemical surplus sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B28/26
Inventor 徐炎华胡俊俞敏洁喻化徐学骁
Owner NJTECH ENVIRONMENT TECH CO LTD
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