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Liquid stabilizer and its application for treating waste incineration fly ash with high lead and cadmium content

A technology of waste incineration fly ash and liquid stabilizer, applied in the field of heavy metal pollution treatment, can solve the problems of high cost, long construction time, large amount of addition, etc., and achieve the effects of low cost, convenient construction and high effective utilization rate

Active Publication Date: 2020-02-21
江苏永之清固废处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the entry requirements of waste incineration fly ash in the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008), the limit of heavy metal leaching concentration after fly ash stabilization treatment is strict. Larger, higher cost and longer construction time
The Chinese invention patent with application number CN200910197214 discloses a method for stabilizing waste incineration fly ash with complementary medicaments, using inorganic reducing medicaments combined with heavy metal ion precipitation-type organic chelating agents to stabilize fly ash, and the treatment process is relatively complicated ,higher cost
The Chinese invention patent application with the application number CN200810219221 discloses a method for treating waste incineration fly ash, which uses dimethylaminosulfate compounds, silicates and pentahydroxyacetate compounds to treat fly ash, and its raw material preparation needs It needs to consume a certain amount of heat energy to prepare a solution at a temperature of 50-80°C, and there is a problem of crystallization of raw materials during transportation and use at room temperature
Extruders and steam chambers are required during processing, which is complex to operate

Method used

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  • Liquid stabilizer and its application for treating waste incineration fly ash with high lead and cadmium content
  • Liquid stabilizer and its application for treating waste incineration fly ash with high lead and cadmium content

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: A waste incineration fly ash project in a certain area of ​​Chongqing, after determining the treatment target, the fly ash meets the requirements of the "Landfill Pollution Control Standard for Domestic Waste" (GB16889-2008). Fly ash samples were collected on site, and the total content of heavy metals was 4758.6mg / kg. The leaching solution prepared according to "Solid Waste Leaching Toxicity Leaching Method Acetic Acid Buffer Solution Method" (HJ / T300-2007), the concentration of lead is 6.39mg / L, cadmium The concentration is 4.99mg / L, which exceeds the GB16889-2008 standard, and other heavy metals do not exceed the standard. Stabilize the waste incineration fly ash, weigh 100g of fly ash, and add a stabilizer with a mass ratio of 5% (ie 5g) to it. The components and ratio of the stabilizer are, by weight, 1 part of dimethyl Sodium dithiocarbamate 1.08g, 0.23 part sodium sulfide 0.25g, 0.23 part sodium silicate 0.25g, 0.1 part sodium lignosulfonate 0.11g, 3.1 ...

Embodiment 2

[0028] Example 2: In a waste incineration fly ash project in Chengdu, the treatment target is determined to be that the treated fly ash meets the requirements of the "Landfill Pollution Control Standard for Domestic Waste" (GB16889-2008). Fly ash samples were collected on site. The total content of heavy metals was 175.28mg / kg. The concentration of lead in the leachate prepared according to the "Solid Waste Leaching Toxicity Leaching Method Acetic Acid Buffer Solution Method" (HJ / T300-2007) was 0.38mg / L, The concentration is 2.17mg / L, the concentrations of lead and cadmium both exceed the GB16889-2008 standard, and other heavy metals do not exceed the standard. The waste incineration fly ash was stabilized, and three different formulations of stabilizers were used to compare the stabilization effects of the lead and cadmium fly ash.

[0029] (1) Comparative Example 1. Weigh 1 part of 100g Chengdu fly ash, and add a sodium sulfide solution with a mass ratio of 1% (ie 1 g) of fly a...

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Abstract

The invention discloses a liquid stabilizer for treatment of waste incineration fly ash high in lead and cadmium content and application thereof. The stabilizer is prepared from, by weight, 1 part of soluble organic sulfide, 0.2-0.4 part of soluble inorganic sulfide, 0.2-0.4 part of sodium silicate, 0.1-0.2 part of sodium lignosulfonate and 3-6 parts of water. The organic sulfide is dithio-carboxylate. The liquid stabilizer formed by mixing organic sulfide, inorganic sulfide, soluble silicate, sodium lignosulfonate and water in proportion has a good effect on stabilizing treatment of the household waste incineration fly ash high in lead and cadmium content. Besides, the liquid stabilizer is convenient to prepare, easy to operate and low in cost.

Description

Technical field [0001] The invention relates to a liquid stabilizer for treating waste incineration fly ash with high lead and cadmium content and its application, and belongs to the technical field of heavy metal pollution treatment. Background technique [0002] Municipal solid waste incineration is an important means of waste disposal in our country. A large amount of fly ash will be produced during the incineration process. If it is not stabilized or solidified, a large amount of heavy metals may cause serious pollution accidents and endanger the health of residents and the ecological environment. . According to statistics, the total amount of urban waste incineration nationwide in 2011 was 25.993 million tons. If the amount of fly ash is estimated to be 3% of the amount of waste incineration, 780,000 tons of fly ash are produced nationwide each year, and about 50% of the fly ash has not been properly treated. [0003] The fly ash produced by incineration is a hazardous solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/08A62D101/43
CPCA62D3/33A62D2101/08A62D2101/43
Inventor 易新建李静周斌邵煜锟魏来
Owner 江苏永之清固废处置有限公司
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