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Alkali activated solidification and stabilization treatment method of refuse incineration fly ash

A waste incineration fly ash and stable treatment technology, applied in the direction of solid waste removal, etc., can solve the problems of poor operability, difficult wastewater treatment, secondary pollution, etc., and achieve significant economic benefits, low treatment costs, and increased capacity lower than the effect

Active Publication Date: 2012-01-04
深圳市龙岗区东江工业废物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention can effectively separate and recover carbon components, chloride ions, dioxins and heavy metals in high-carbon and high-chlorine waste incineration fly ash at the same time, the steps of this method are lengthy, the operability is not strong, and it produces The waste water is difficult to deal with, and it is easy to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for alkali-activated solidification and stable treatment of waste incineration fly ash, including the steps:

[0038] A. Store the collected garbage incineration fly ash according to the method of storing cement to prevent moisture absorption and compaction;

[0039] B. Pretreatment of waste incineration fly ash, that is, grinding the fly ash to make its particle size below 80 μm, and adjust the activity of the fly ash with an activity regulator as needed, so that the activity index value is greater than 1 or meets the table 1. Active components of fly ash; activity regulators include one or a mixture of two or more of fly ash, slag, gypsum, and clay;

[0040] C. Take 5000g±1% of fly ash after pretreatment in step B, add 2500g±1% of tap water, 100g of sodium sulfide or potassium sulfide, and fully stir to make the soluble heavy metals and heavy metal stabilizers in the fly ash sufficient Combined and stable mineralization, it becomes fly ash slurry;

[0041] D. Add...

Embodiment 2

[0047] A method for alkali-activated solidification and stable treatment of waste incineration fly ash, including the steps:

[0048] A. Store the collected garbage incineration fly ash according to the method of storing cement to prevent moisture absorption and compaction;

[0049] B. Pretreatment of waste incineration fly ash, that is, grinding the fly ash to make its particle size below 80 μm, and adjust the activity of the fly ash with an activity regulator as needed, so that the activity index value is greater than 1 or meets the table 1. Active components of fly ash; activity regulators include one or a mixture of two or more of fly ash, slag, gypsum, and clay;

[0050] C. Take 5000g±1% of fly ash after pretreatment in step B, add 2000g of reclaimed water and 45g of thiourea, and fully stir to make the soluble heavy metals in the fly ash fully combined with the heavy metal stabilizer and stabilize the mineralization , Become fly ash slurry;

[0051] D. Add 100g or 150g of sod...

Embodiment 3

[0057] A method for alkali-activated solidification and stable treatment of waste incineration fly ash, including the steps:

[0058] A. Store the collected garbage incineration fly ash according to the method of storing cement to prevent moisture absorption and compaction;

[0059] B. Pretreatment of waste incineration fly ash, that is, grinding the fly ash to make its particle size below 80 μm, and adjust the activity of the fly ash with an activity regulator as needed, so that the activity index value is greater than 1 or meets the table 1. Active components of fly ash; activity regulators include one or a mixture of two or more of fly ash, slag, gypsum, and clay;

[0060] C. Take 5000g±1% of fly ash after pretreatment in step B, add 4000g tap water, 25g thiourea, 25g sodium dihydrogen phosphate or potassium phosphate, and fully stir to make the soluble heavy metals and heavy metals in the fly ash The stabilizer is fully combined to stabilize the mineralization and become fly ash...

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Abstract

The invention relates to an alkali activated solidification and stabilization treatment method of refuse incineration fly ash. The method comprises the following steps of: A: carrying out a pretreatment on the refuse incineration fly ash; B, then adding water and heavy metal stabilizing agents and fully stirring so as to fully integrate soluble heavy metals in the fly ash with the heavy metal stabilizing agents and then realizing a mineralization stability; C, adding alkali activating agents into fly ash slurry after finishing the B step and fully stirring; D, carrying out a heating treatment on a water bath after finishing the C sep, controlling a heating temperature and a heating time, and aperiodically stirring so as to uniformly heat the fly ash slurry materials; and E, finally shaping and maintaining the mixed materials so as to further blockade mineralized heavy metals in the fly ash and simultaneously solidify dioxin in the fly ash, and finally realizing the harmless solidification and stabilization of the fly ash. According to the method provided by the invention, the gelling reaction of the fly ash is generated by using the alkali activating agents to activate the fly ash activity only on a base of regulating the fly ash activity, and the double-effect stabilization of the fly ash is obtained by simultaneously supplementing the heavy metal stabilizing agents; moreover, the method has the advantages of low cost, good effect, low increase-volume rate and no secondary pollution.

Description

technical field [0001] The present invention relates to the destruction of solid waste or the conversion of solid waste into useful or harmless things, especially to the solidification stabilization and harmless treatment of potentially active hazardous solid waste, especially to the use of alkali activators to activate fly ash activity , A treatment method that causes the fly ash to undergo a gelation reaction to achieve solidification and stability. Background technique [0002] Waste incineration fly ash refers to the residue collected in the waste incineration flue gas purification system. It not only enriches a large amount of toxic heavy metals such as mercury, cadmium, lead, and zinc, but also enriches a large amount of dioxins. , is a kind of waste with both heavy metal hazard characteristics and environmental persistent organic toxic substance hazard characteristics, which is extremely harmful to human health and the ecological environment. It must be stabilized be...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 任玉森汪春霞孙业政刘浪静姜雪丽
Owner 深圳市龙岗区东江工业废物处置有限公司
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