Extracting agent for treating dioxin in flying ash and method for extracting dioxin by extracting agent

An extractant and fly ash technology, applied in the field of environmental engineering, can solve the problems of low decomposition efficiency and incomplete elimination of dioxin, and achieve the effect of high processing efficiency, low price and wide sources

Inactive Publication Date: 2012-03-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of incomplete elimination of dioxins and low decomposition efficiency under low temperature conditions in the prior art, the object of the present invention is to provide an extraction agent for treating dioxins in fly ash, which can be used in municipal solid waste incineration plants Harmless treatment of fly ash, and the extraction agent has the advantages of wide source of raw materials, low price, high treatment efficiency, and no secondary pollution when used

Method used

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  • Extracting agent for treating dioxin in flying ash and method for extracting dioxin by extracting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Sulfonated kerosene with a volume percentage of 80%, n-hexane with a volume percentage of 10% and acetone with a volume percentage of 10% were uniformly mixed to prepare an extractant.

[0029] figure 1 It is a flowchart of a method for extracting dioxins in fly ash with the extractant for treating dioxins in fly ash of the present invention. The prepared extraction agent for treating dioxin in the fly ash and the municipal solid waste incineration fly ash were mixed and extracted according to the mass ratio of 1:1, placed in a stirrer at room temperature and stirred continuously for 12 hours, and then left to stand at room temperature and separated into layers , solid-liquid separation, after static stratification, it is divided into upper and lower layers, the upper layer is liquid phase extractant; the lower layer is solid phase fly ash, the dioxin concentration in fly ash is 2.1-2.7μgTEQ / kg, which is lower than that of domestic waste filling The concentration limit...

Embodiment 2

[0032] Sulfonated kerosene with a volume percentage of 10%, n-hexane with a volume percentage of 50% and acetone with a volume percentage of 40% were uniformly mixed to prepare an extractant.

[0033] The prepared extraction agent for treating dioxin in the fly ash and the municipal solid waste incineration fly ash were mixed and extracted according to a mass ratio of 3:1, placed in a stirrer at room temperature and stirred continuously for 24 hours, and then left to stand at room temperature and separated into layers , solid-liquid separation, after static stratification, it is divided into upper and lower layers, the upper layer is the liquid phase extractant, the lower layer is the solid phase fly ash, the dioxin concentration in the fly ash is 1.7-2.2μgTEQ / kg, which is lower than that of domestic waste filling Concentration limits of fly ash toxic equivalent in landfill pollution control standards. Among them: after the extractant is repeatedly extracted and reaches satura...

Embodiment 3

[0035] Sulfonated kerosene with a volume percentage of 45%, n-hexane with a volume percentage of 30% and acetone with a volume percentage of 25% were uniformly mixed to prepare an extractant.

[0036] The prepared extraction agent for treating dioxin in the fly ash and the municipal solid waste incineration fly ash were mixed and extracted according to the mass ratio of 2:1, placed in a stirrer at room temperature and stirred continuously for 24 hours, and then left to stand at room temperature and separated into layers , solid-liquid separation, after static stratification, it is divided into upper and lower layers, the upper layer is the liquid phase extractant, the lower layer is the solid phase fly ash, the dioxin concentration in the fly ash is 2.0-2.5μgTEQ / kg, which is lower than Concentration limits of fly ash toxic equivalent in landfill pollution control standards. Among them: after the extractant is repeatedly extracted and reaches saturation, it can be back-extracte...

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Abstract

The invention discloses an extracting agent for treating dioxin in flying ash and a method for extracting the dioxin by the extracting agent, which belong to the technical field of environment engineering. The extracting agent comprises the following ingredients in percentage by volume: 10 to 80 percent of sulfonated kerosene, 10 to 50 percent of normal hexane and 10 to 40 percent of acetone. A method for preparing the extracting agent comprises the following step that the raw materials in the proportion are uniformly mixed. The invention also discloses the method for extracting the dioxin by the extracting agent, which comprises the following steps that: the extracting agent for treating the dioxin in the flying ash and the flying ash are mixed according to the mass ratio of 1:1 to 3:1, the mixed materials are placed in a stirrer at normal temperature for being continuously stirred for 12 to 48h, and then, the still-standing delamination is carried out. The extracting agent has wide sources, low price and high treatment efficiency. The equivalent concentration of the toxicity of the dioxin contained in the flying ash after the extraction treatment can be lower than the limit value specified by the pollution control standard of municipal solid waste landfills, the flying ash can be sanitarily landfilled after further innocent treatment, and the efficient innocent treatment and the resource utilization of the flying ash are realized.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to an extraction agent for treating dioxins in fly ash and a method for extracting dioxins. Background technique [0002] Domestic waste incineration fly ash contains carcinogenic dioxins (PCDD / Fs), and also concentrates more heavy metals in the waste. It is a recognized and legally hazardous waste that must be treated and disposed of safely. Currently, domestic waste incineration fly ash is mainly used in safe landfills, but safe landfills occupy a large area and require high processing costs. The main mineral components in fly ash are silicates and aluminosilicates, which belong to SiO 2 -Al 2 o 3 - Metal oxide system, the fly ash after harmless treatment can be used as a resource. [0003] The content of dioxins in fly ash only accounts for one hundred thousand parts of the mass of fly ash. If the extremely small amount of dioxins in fly ash is completely sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02
Inventor 赵由才汪宝英左敏瑜宋玉甄广印
Owner TONGJI UNIV
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