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Process for preparing gelling material from municipal solid waste incineration fly ash

A technology of domestic waste incineration and waste incineration fly ash, which is applied in the direction of manufacturing tools, ceramic molding machines, etc., to achieve the effect of controlling environmental pollution and protecting water and soil resources

Inactive Publication Date: 2017-04-19
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, three factors need to be considered for resource utilization of domestic waste incineration fly ash: (1) Performance and cost

Method used

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  • Process for preparing gelling material from municipal solid waste incineration fly ash
  • Process for preparing gelling material from municipal solid waste incineration fly ash
  • Process for preparing gelling material from municipal solid waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 100 parts of domestic waste incineration fly ash and put them in a container, add 4 parts of sodium hydroxide and 70 parts of water, mix and stir, and complete the pretreatment after reacting at 50°C for 0.5h, and place the pretreated domestic waste incineration fly ash at 105 °C drying for later use. Take 60 parts of domestic waste incineration fly ash, 40 parts of mineral powder, and 4 parts of sodium hydroxide after pretreatment, mix them in a container, add 40 parts of water, stir at 200 rpm for 20 minutes, mix the mixture and inject it into the mold Vibrate at a frequency of 50 times / min for 2 min. The mold sealing film was cured in a constant temperature curing box at 60°C for 12 hours, and then the mold was removed. The removed block was placed in a water curing box at 60°C for 21 days, and then the fly ash-based cementitious material was obtained. The detection index of the test piece in embodiment 1 is shown in the subscript.

[0023] Specimen detection ...

Embodiment 2

[0026] Take 80 parts of domestic waste incineration fly ash and put them in a container, add 2.5 parts of calcium hydroxide and 50 parts of water, mix and stir, and complete the pretreatment after reacting at 40°C for 1 hour, and place the pretreated domestic waste incineration fly ash at 105°C Dry and set aside. Take 71 parts of domestic waste incineration fly ash after pretreatment, 28 parts of mineral powder, and 8 parts of sodium silicate, put them in a container and mix them evenly, add 51 parts of water, stir at 120 rpm for 25 minutes, pour the mixture into the mold after stirring Vibrate at a frequency of 40 times / min for 3 min. The mold sealing film was placed in a constant temperature curing box at 35°C for 36 hours, and then the mold was removed. The removed block was placed in a water curing box at 30°C for 25 days, and then the fly ash-based cementitious material was obtained. The detection index of the test piece in embodiment 1 is shown in the subscript.

[002...

Embodiment 3

[0030] Take 90 parts of domestic waste incineration fly ash and put them in a container, add 3 parts of potassium hydroxide and 60 parts of water, mix and stir, and complete the pretreatment after reacting at 20°C for 2 hours. Dry and set aside. Take 80 parts of domestic waste incineration fly ash after pretreatment, 20 parts of mineral powder, and 2 parts of potassium hydroxide and mix them in a container, add 60 parts of water, stir at a frequency of 50 rpm for 30 minutes, and inject the mixture into the mold after stirring Vibrate at a frequency of 20 times / min for 6 minutes. The mold sealing film was cured in a constant temperature curing box at 20°C for 48 hours, and then the mold was removed, and the removed blocks were cured in a water curing box at 20°C for 28 days to obtain a fly ash-based cementitious material. The detection index of the test piece in embodiment 1 is shown in the subscript.

[0031] Specimen detection index in the embodiment 1 of table 3

[0032] ...

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Abstract

The invention relates to a process for preparing a gelling material from municipal solid waste incineration fly ash. The process comprises the following steps: weighing 80 to 100 parts by mass of the municipal solid waste incineration fly ash and 2 to 4 parts by mass of a pretreatment chemical agent alkali, adding 50 to 70 parts by mass of water, carrying out a reaction at 20 to 50 DEG C for 0.5 to 2 h, and carrying out drying, grinding and sieving so as to obtain pretreated municipal solid waste incineration fly ash; weighing 60 to 80 parts by mass of the pretreated municipal solid waste incineration fly ash, 20 to 40 parts by mass of an admixture and 2 to 8 parts by mass of an activator, and carrying out uniform mixing; adding 40 to 60 parts by mass of water, and carrying out stirring so as to obtain a mixed material; injecting the mixed material into a mold, and carrying out vibration compaction; placing the grouted mold in a constant-temperature weather curing box with a temperature of 20 to 60 DEG C, carrying out curing for 12 to 48 hours, and carrying out demolding; and carrying out placing in a water curing box with a temperature of 20 to 60 DEG C, and carrying out curing for 21 to 28 d so as to obtain the gelling material. According to the invention, industrial wastes can be utilized according to local conditions, so land and water resources are effectively protected; environmental pollution is controlled; and significant environmental, economic and social benefits are obtained.

Description

technical field [0001] The invention relates to a resource-based disposal of solid waste, in particular to a process for preparing gelling materials from domestic waste incineration fly ash. Background technique [0002] In the process of domestic waste incineration, the substances collected in the heat recovery system and flue gas purification system, that is, the fly ash of domestic waste incineration, often account for 5% to 10% of the amount of incinerated waste, 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 10% to 15%, 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 and Ni. During the waste incineration process, due to incomplete incineration due to waste components, ventilation ...

Claims

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Application Information

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IPC IPC(8): C04B28/02B28B11/24
CPCC04B28/021B28B11/24C04B2201/50C04B2201/20C04B18/12C04B22/062C04B22/08
Inventor 刘志英徐炎华康治金徐学骁刘杨
Owner NANJING UNIV OF TECH
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