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Process for gelling solidifying of heavy metals in municipal solid waste incineration fly ash by adding mineral powder

A domestic waste incineration and solidification technology, which is applied to the removal of solid waste, chemical instruments and methods, transportation and packaging, etc., can solve the problems of easy leaching of heavy metals, high capacity expansion ratio, unfavorable solidified body resource utilization, etc., to achieve Good environmental compatibility

Inactive Publication Date: 2018-12-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of Portland cement-based solidified fly ash has the advantages of simple process, low cost, and wide range of material sources. It is widely used, but it has a series of defects such as high volumetric ratio, easy leaching of heavy metals, and poor acid resistance, which is not conducive to solidification. Body resource utilization

Method used

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  • Process for gelling solidifying of heavy metals in municipal solid waste incineration fly ash by adding mineral powder
  • Process for gelling solidifying of heavy metals in municipal solid waste incineration fly ash by adding mineral powder
  • Process for gelling solidifying of heavy metals in municipal solid waste incineration fly ash by adding mineral powder

Examples

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Effect test

Embodiment 1

[0027] Take 80 parts of domestic waste incineration fly ash, 4 parts of calcium hydroxide, add 60 parts of water, place in a mixer and stir at a slow speed of 100 rpm for 3 hours, dry at 105 °C, grind through a 100-mesh sieve for later use; weigh 70 Put 30 parts of pretreated waste incineration fly ash and 30 parts of S95 ore powder in a container, place them in a mixer and stir for 2 minutes at a frequency of 50 rpm, mix well, then weigh 3 parts of sodium hydroxide and dissolve in 40 parts of distilled water Make an alkali solution; add the alkali solution to the mixture, place it in a mixer and stir at a frequency of 100 rpm for 5 minutes, and then stir at a frequency of 600 rpm for 5 minutes; take out the mud and beat it for 1 minute to form a muddy mass, and use Wrap and seal with plastic wrap to isolate the air, remove the wrap after curing in a constant temperature curing box at 25°C for 20 hours, and place the cured body in a water curing box at 25°C for 14 days to obtai...

Embodiment 2

[0031] Take 100 parts of domestic waste incineration fly ash, 5 parts of potassium hydroxide, add 70 parts of water, put it in a mixer and stir at a slow speed of 150 rpm for 2.5 hours, dry it at 100°C, and grind it through a 100-mesh sieve for later use; weigh 80 parts of pretreated waste incineration fly ash and 20 parts of S105 ore powder are placed in a container, placed in a mixer and stirred at a frequency of 80 rpm for 3 minutes, mixed evenly, and then weighed and dissolved in 4 parts of calcium hydroxide in 50 parts of distilled water Add alkaline solution to the mixture, place it in a mixer and stir at 150 rpm for 3 minutes, then at 700 rpm for 3 minutes; take out the mud and beat it for 0.5 min to form a muddy mass , wrapped with plastic wrap to seal off the air, cured in a constant temperature curing box at 40°C for 24 hours, then removed the wrapping, and placed the cured body in a water curing box at 20°C for 28 days to obtain a gelled solidified body. The heavy m...

Embodiment 3

[0035] Take 120 parts of domestic waste incineration fly ash, 6 parts of sodium hydroxide, add 80 parts of water, put it in a mixer at 200 rpm and stir for 2 hours at a slow speed, dry it at 95°C, grind it through a 100-mesh sieve for later use; weigh 85 Put 1 part of pretreated waste incineration fly ash and 15 parts of S75 ore powder in a container, place in a mixer and stir for 5 minutes at a frequency of 100 rpm, mix well, then weigh 5 parts of potassium hydroxide and dissolve in 35 parts of distilled water Make an alkali solution; add the alkali solution to the mixture, place it in a mixer and stir at a frequency of 200 rpm for 2 minutes, and then stir at a frequency of 800 rpm for 4 minutes; take out the mud and beat it for 2 minutes to form a muddy mass, and use Wrap it with plastic wrap and seal it to isolate the air. After curing for 30 hours in a constant temperature curing box at 30°C, remove the wrapping, and place the cured body in a water curing box at 30°C for 5 ...

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Abstract

The invention relates to a process for gelling solidifying of heavy metals in municipal solid waste incineration fly ash by adding mineral powder. The process comprises the steps that 80-120 parts ofthe municipal solid waste incineration fly ash are taken and placed in a container, 4-6 parts of pretreatment agents and 60-80 parts of water are added, stirring and drying are performed sequentially,and grinding and sieving are performed for standby application; 70-85 parts of pre-treated waste incineration fly ash and 15-30 parts of mineral powder admixtures are taken and mixed uniformly in a blender, then 3-5 parts of exciting agents and 35-50 parts of distilled water are taken to prepare an alkali solution to be added into the mixture, and the mixture is placed in the blender to stir to aslurry state; the slurry is taken out and beaten into a mud pie and sealed in a constant temperature climate box for curing, and then a solidified body is placed in a water curing box for curing for5-28d to obtain a gelling solidified body. The municipal solid waste incineration fly ash is subjected to gelling solidifying by being added with the mineral powder, the migration of the heavy metalsis effectively reduced, industrial waste can be used according to local conditions, water and soil resources are protected, and environmental pollution is controlled. Significant environmental, economic and social benefits are achieved.

Description

technical field [0001] The invention relates to a harmless disposal of solid waste, in particular to a process for adding ore powder to gel and solidify heavy metals in domestic waste incineration fly ash. Background technique [0002] The incineration method has gradually become a hot spot in the research of domestic waste disposal because of its good volume reduction, high degree of harmlessness, and energy recovery. More and more cities (especially developed cities with limited land use and large waste generation) prefer to use incineration to deal with domestic waste. However, as a product of incineration, fly ash is enriched with a large amount of harmful substances. According to statistics, at present, the amount of fly ash produced by the incineration of domestic waste in my country exceeds 4 million tons every year. By 2020, the annual discharge of fly ash will reach about 10 million tons. Domestic waste incineration fly ash is rich in a large amount of heavy metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/25
Inventor 刘志英曹洁徐炎华董俊佳王雷姚科
Owner NANJING UNIV OF TECH
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