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Process for preparing baking-free ecological brick from garbage burning fly ash

A technology for waste incineration fly ash and ecological bricks, which is applied in the technological field of waste incineration fly ash to prepare non-burning ecological bricks, and achieves the effects of short disposal period, high efficiency and high waste rate.

Inactive Publication Date: 2016-12-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current research, the resource utilization of waste combustion fly ash needs to consider three factors: (1) Performance and cost

Method used

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  • Process for preparing baking-free ecological brick from garbage burning fly ash
  • Process for preparing baking-free ecological brick from garbage burning fly ash
  • Process for preparing baking-free ecological brick from garbage burning fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (6) Take 10 parts by weight of waste incineration fly ash and grind it through a 100-mesh sieve, put it in a container, add 5 parts by weight of sodium hydroxide and 20 parts by weight of water, mix and react at 20°C for 3 hours. Continue to add 90 parts by weight of P.O32.5 ordinary Portland cement, place in a mixer at 50 rpm, and stir for 5 minutes. The mixture was poured into the ecological brick mold and vibrated for 1 minute at a vibration frequency of 50 times / min. The mold that has finished grouting is covered with a layer of plastic wrap, placed in a constant temperature and humidity climate box with a humidity of 95% at 20°C and maintained for 48 hours before removing the mold. The brick body after demoulding is placed in a water curing box at 20°C for 28 days to obtain an ecological brick. The compressive strength of the prepared ecological brick is 34.4MPa.

[0024] The ecological brick prepared in Example 1 was tested for heavy metal leaching, and the resu...

Embodiment 2

[0029] (7) Take 40 parts by weight of waste incineration fly ash and grind it through a 100-mesh sieve, put it in a container, add 15 parts by weight of sodium hydroxide and 40 parts by weight of water, mix and react at 20°C for 3 hours. Continue to add 60 parts by weight of P.O42.5 ordinary Portland cement, place it in a mixer at 200 rpm, and stir for 2 minutes. The mixture was poured into the ecological brick mold and vibrated for 2 minutes at a vibration frequency of 20 times / min. The mold that has finished grouting is covered with a layer of plastic wrap, placed in a constant temperature and humidity climate box with a humidity of 80% at 40°C and maintained for 48 hours before removing the mold. The brick body after demoulding is placed in a water curing box at 60°C for 28 days to obtain an ecological brick. The compressive strength of the prepared ecological brick is 47.6MPa.

[0030] The ecological brick prepared in Example 2 was tested for heavy metal leaching, and th...

Embodiment 3

[0035] (8) Take 30 parts by weight of waste incineration fly ash and grind it through a 100-mesh sieve, put it in a container, add 5 parts by weight of sodium hydroxide and 30 parts by weight of water, mix and react at 50°C for 0.5h. Continue to add 70 parts by weight of P.O52.5 ordinary Portland cement, place in a mixer at 200 rpm, and stir for 5 minutes. The mixture was poured into the ecological brick mold and vibrated for 1 minute at a vibration frequency of 50 times / min. The mold that has finished grouting is covered with a layer of plastic wrap, placed in a constant temperature and humidity climate box with a humidity of 90% at 30°C and maintained for 14 hours before removing the mold. The brick body after demoulding is placed in a water curing box at 50°C for 21 days to obtain an ecological brick. The compressive strength of the prepared ecological brick is 56.4MPa.

[0036] The ecological brick prepared in Example 3 was tested for heavy metal leaching, and the result...

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Abstract

The invention relates to a process for preparing a baking-free ecological brick from garbage burning fly ash. The method comprises the following steps: 10-40 parts by weight of the garbage burning fly ash is grinded, sieved and placed in a container, 5-15 parts by weight of sodium hydroxide and 20-40 parts by weight of water are added, mixing is carried out, and a reaction is carried out; 50-90 parts by weight of ordinary portland cement is added with stirring, and a mixed material is obtained; the material is injected into an ecological brick die for vibration compaction; after grouting, the die is placed in a constant temperature constant humidity climate box for maintenance, and the die is removed; after the die is removed, a brick body is placed in a water maintainer for maintenance, and the ecological brick is obtained. The process has the advantages of low operation cost, short disposal period, low secondary pollution, high waste utilization rate, effective stabilization of toxic substances in the garbage burning fly ash, and low toxicity leaching rate of the product; the prepared ecological brick does not need baking, and has the advantages of simple process and high efficiency.

Description

technical field [0001] The invention relates to a process for recycling solid waste, in particular to a process for preparing burn-free ecological bricks from waste incineration fly ash. Background technique [0002] Waste incineration will produce a certain amount of waste incineration ash, among which the substances collected in the heat recovery system and flue gas purification system, that is, waste incineration fly ash, often account for 5% to 10% of the amount of waste incinerated, or even 10% to 15%. Fly ash is generally off-white or dark gray, with a particle size of less than 300 μm, a moisture content of 5% to 15%, a heat loss rate of 34% to 51%, and various particle shapes. The pollution caused by fly ash to the environment mainly includes heavy metal pollution, dioxin pollution and dissolved salt pollution. The main heavy metal pollution elements in fly ash are Pb, Cd, Hg and Zn. In the process of waste incineration, due to incomplete incineration due to waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B18/105C04B22/062
Inventor 刘志英徐炎华康治金徐学骁
Owner NANJING UNIV OF TECH
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