Garbage incineration fly ash treatment method

A waste incineration fly ash and treatment method technology, which is applied in the field of environmental engineering, can solve the problems of large residual amount of heavy metal ions, etc., and achieve the effect of reducing the content of heavy metal ions and reducing the impact on the environment

Inactive Publication Date: 2020-01-03
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of actual treatment, there are still many s

Method used

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  • Garbage incineration fly ash treatment method

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Example Embodiment

[0029] Example 1

[0030] The invention provides a method for treating waste incineration fly ash, which specifically includes the following operation steps:

[0031] Step 1: Pretreatment: Fully mix the fly ash produced by the combustion of domestic waste with water at a ratio of 1:5-6 to complete the water washing pretreatment of the fly ash produced by the combustion of domestic waste;

[0032] Step 2: Primary treatment: add 0.8-1.2% ethylenediaminetetraacetic acid disodium salt (EDTA) or diethyltriaminepentaacetic acid ( DTPA) inorganic agent solution, stir evenly, so that the inorganic agent and the heavy metal ions in the fly ash are coordinated to form stable soluble compounds, so as to complete the initial leaching treatment of the heavy metal ions. The pH range is 3-9, the leaching time is 24h, and the leaching method is shaking extraction;

[0033] Step 3: Secondary treatment: use alkali (NaOH) leaching and acid (H 2 SO 4 ) leaching the organically combined mode, ...

Example Embodiment

[0035] Example 2

[0036] The invention provides a method for treating waste incineration fly ash, which specifically includes the following operation steps:

[0037] Step 1: Pretreatment: Fully mix the fly ash produced by the combustion of domestic waste with water at a ratio of 1:5-6 to complete the water washing pretreatment of the fly ash produced by the combustion of domestic waste;

[0038] Step 2: Primary treatment: add 0.8-1.2% ethylenediaminetetraacetic acid disodium salt (EDTA) or diethyltriaminepentaacetic acid ( DTPA) inorganic agent solution, stir evenly, so that the inorganic agent and the heavy metal ions in the fly ash are coordinated to form stable soluble compounds, so as to complete the initial leaching treatment of the heavy metal ions. The pH range is 3-9, the leaching time is 24h, and the leaching method is shaking extraction;

[0039] Step 3: Secondary treatment: use alkali (NaOH) leaching and acid (H 2 SO 4 ) leaching the organically combined mode, ...

Example Embodiment

[0041] Example 3

[0042] The invention provides a method for treating waste incineration fly ash, which specifically includes the following operation steps:

[0043] Step 1: Pretreatment: Fully mix the fly ash produced by the combustion of domestic waste with water at a ratio of 1:5-6 to complete the water washing pretreatment of the fly ash produced by the combustion of domestic waste;

[0044] Step 2: Primary treatment: add 0.8-1.2% ethylenediaminetetraacetic acid disodium salt (EDTA) or diethyltriaminepentaacetic acid ( DTPA) inorganic agent solution, stir evenly, so that the inorganic agent and the heavy metal ions in the fly ash are coordinated to form stable soluble compounds, so as to complete the initial leaching treatment of the heavy metal ions. The pH range is 3-9, the leaching time is 24h, and the leaching method is shaking extraction;

[0045] Step 3: Secondary treatment: use alkali (NaOH) leaching and acid (H 2 SO 4 ) leaching the organically combined mode, ...

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Abstract

The invention discloses a garbage incineration fly ash treatment method and in particular relates to the technical field of environment engineering. The garbage incineration fly ash disposal method specifically comprises the following steps: S1, carrying out washing pre-treatment on fly ash; S2, carrying out initial leaching treatment on an ash/water mixed system after washing by using an inorganic solvent; and S3, carrying out secondary leaching by way of organically combining alkali leaching and acid leaching. By carrying out washing pre-treatment on the fly ash generated by combustion of household garbage by water and adding an inorganic agent solution into the ash/water mixed system after washing for initially leaching heavy metal ions, the inorganic agent solution and the heavy metalions in the fly ash are coordinated to form a stable soluble compound, and the ash/water mixed system after initially leaching the heavy metal ions in the fly ash by using the inorganic agent solutionis secondarily leached by way of organically combining alkali leaching and acid leaching, so that the content of the heavy metal ions in the fly ash can be reduced greatly.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, and more specifically, the invention relates to a treatment method for waste incineration fly ash. Background technique [0002] Municipal waste disposal is the top priority of urban sanitation work. At present, incineration is a relatively common treatment method. However, the process of waste incineration will produce a large amount of fly ash, which is about 2-5% of the mass of waste entering the furnace. The main components of waste incineration fly ash are CaO, CaSO4, SiO2, Al2O3, MgO, heavy metals Pb, Cd, Fe, Cr, Cu, Zn, and dioxins. Hazardous solid waste is processed and cannot enter the ecological environment without special treatment. With the popularization and application of incineration in municipal solid waste, the output of waste incineration fly ash is increasing day by day. Although the bulk density of fly ash is only 600kg / m 3 left and right, but hoarding and ...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/80B09B2101/30
Inventor 阳杨林辉荣何睿鸣刘科强赵静左姣
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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