Fly Ash Solidification and Stabilization Method

A fly ash solidification and fly ash technology, which is applied in the field of fly ash solidification and stabilization, can solve problems such as poor solidification effect of heavy metals, carbon dioxide gas emissions, and difficulty in finding chemical agents, so as to ensure long-term stability, reduce leaching concentration, The effect of solving environmental safety hazards

Inactive Publication Date: 2016-07-27
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, countries such as Japan, Europe and the United States have generally adopted this method as the final disposal method of some hazardous solid wastes, but it generally has the following problems: the addition of cement can easily lead to an increase in the volume of the processed product; some heavy metals (such as cadmium, hexavalent chromium, etc.) , molybdenum and zinc, etc.) have poor curing effects; the production of cement required for curing can easily lead to a large amount of carbon dioxide gas emissions, which is contrary to relevant carbon emission reduction policies
However, chemical agents generally have certain selectivity, and it is difficult to find a broad-spectrum chemical agent

Method used

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  • Fly Ash Solidification and Stabilization Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The fly ash sample comes from a waste incineration plant in Beijing. The heavy metal content in the sample is shown in Table 1-1, and the Cl content is 14.06%. From Table 1-2, it can be seen that the leaching concentration of Pb in fly ash is relatively high, which exceeds the standard limit of Pb in the "Identification Standard for Leach Concentration of Hazardous Wastes" (GB5085.3-2007), so the fly ash is judged as Hazardous waste with leaching toxicity characteristics.

[0032] Table 1-1 Content of heavy metal elements in incineration fly ash (mg / kg)

[0033]

[0034]

[0035] Table 1-2 Leaching characteristics of heavy metal elements in incineration fly ash

[0036]

[0037] This fly ash solidification stabilization method is as follows, and dechlorination and heavy metal solidification stabilization can be performed simultaneously.

[0038] (1) Add 15% NaOH to the fly ash, add 75% water by mass percentage, and make primary mud under the condition of 25°C...

Embodiment 2

[0046] The fly ash sample comes from a waste incineration plant in Chongqing. The heavy metal content in the sample is shown in Table 2-1, and the Cl content is 17.24%. It can be seen from Table 2-2 that the leaching concentration of Pb in fly ash is relatively high, which exceeds the standard limit of Pb in the "Identification Standard for Leach Concentration of Hazardous Wastes" (GB5085.3-2007), so the fly ash is judged as Hazardous waste with leaching toxicity characteristics.

[0047] Table 2-1 Content of heavy metal elements in incineration fly ash (mg / kg)

[0048]

[0049] Table 2-2 Leaching characteristics of heavy metal elements in incineration fly ash

[0050]

[0051] This fly ash solidification stabilization method is as follows, and dechlorination and heavy metal solidification stabilization can be performed simultaneously.

[0052] (1) Add 20% NaOH to fly ash, add 100% water by mass percentage, and make primary mud under the condition of 25°C.

[0053] (2...

Embodiment 3

[0060] The fly ash sample comes from a waste incineration plant in Beijing. The heavy metal content in the sample is shown in Table 3-1, and the Cl content is 14.06%. It can be seen from Table 3-2 that the leaching concentration of Pb in fly ash is relatively high, which exceeds the standard limit of Pb in the "Identification Standard for Leach Concentration of Hazardous Wastes" (GB5085.3-2007), so the fly ash is judged as Hazardous waste with leaching toxicity characteristics.

[0061] Table 3-1 Content of heavy metal elements in incineration fly ash (mg / kg)

[0062]

[0063] Table 3-2 Leaching characteristics of heavy metal elements in incineration fly ash

[0064]

[0065] This fly ash solidification stabilization method is as follows, and dechlorination and heavy metal solidification stabilization can be performed simultaneously.

[0066] (1) Add 6% Na to the fly ash 2 SiO 3 , add water with a mass percentage of 50%, and make primary mud under the condition of 25...

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Abstract

The invention provides a fly ash solidification and stabilization method, which comprises a first pulping procedure, a stirring procedure, a digestive treatment procedure, a crushing treatment procedure, a mixture preparation procedure, a second pulping procedure and a conserving procedure. According to the fly ash solidification and stabilization method provided by the invention, dechlorinating and heavy metal solidification and stabilization treatment can be simultaneously carried out on fly ashes as hazardous wastes; and the generated product can also be applied to production of building materials, and is mainly used as aggregate of concrete and ceramsite for the building materials.

Description

technical field [0001] The invention relates to hazardous waste treatment technology, in particular to a method for solidifying and stabilizing fly ash, which can simultaneously perform dechlorination and solidify and stabilize heavy metals for fly ash. Background technique [0002] Landfill is the main treatment method for domestic waste in my country. However, due to the continuous growth of domestic waste production, landfill is gradually difficult to meet the growing processing requirements, and a series of municipal and environmental problems such as "garbage siege" have arisen. [0003] Incineration technology can relieve the pressure of domestic waste treatment and complete the reduction of domestic waste. Waste incineration power generation technology can also complete the recycling of waste. In 2010, there were 104 waste incineration plants in China, with a processing capacity of 23.17 million tons, accounting for 18.2% of the amount of harmless garbage. According ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 李扬高兴保何洁王琪黄启飞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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