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A stabilizer for waste incineration fly ash and its synthesis method

A waste incineration fly ash and synthesis method technology, which is applied in the direction of protection devices against harmful chemicals, can solve the problems of not meeting the discharge standards and low efficiency of waste fly ash treatment, so as to reduce secondary pollution and benefit large-scale The effect of low production and production costs

Active Publication Date: 2018-01-23
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application provides a stabilizer for waste incineration fly ash and its synthesis method, which solves the technical problem that the stabilizer in the prior art has low treatment efficiency for waste fly ash and does not meet the national environmental related emission standards

Method used

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  • A stabilizer for waste incineration fly ash and its synthesis method
  • A stabilizer for waste incineration fly ash and its synthesis method

Examples

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preparation example Construction

[0022] This application provides a stabilizer for waste incineration fly ash and a method for synthesizing the stabilizer. The composition and mass percentage of the stabilizer are: thiourea 25-30%, calcium bentonite 40-60%, and calcium phosphate 15-20% , Coal-fired power plant secondary fly ash 10-20%, calcium formate 0-5%. The method includes: weighing each component in proportion and drying to moisture content rate <1%, to obtain the dried mixed components; put the dried mixed components into a closed mixing system, and mix; send the mixed components after mixing into the vacuum tank via a packing machine or air pressure pump Store to obtain the stabilizer. The stabilizer of the present application can improve the efficiency of fly ash treatment and disposal of waste incineration enterprises, can effectively stabilize the heavy metal components in the incineration fly ash, and the toxic dissolution of heavy metals is lower than the national environmental protection emission ...

Embodiment 1

[0038] Example 1: Take fly ash from the waste incineration power plant of Plant A, mix it with fly ash according to 4% mass fraction, solidify the mold after mixing, demold after 1 day, and measure the toxic leaching of heavy metal ions after curing for 7 days. The result shows toxic leaching The results meet the emission threshold of national environmental standards, and the dioxin toxicity equivalent is 0.013ng / Teq.

Embodiment 2

[0039] Example 2: Take fly ash from the waste incineration power plant of Plant A, mix it with fly ash according to 2% mass fraction, solidify the mold after mixing, demold after 1 day, and measure the toxic leaching of heavy metal ions after 7 days of curing. The result shows toxic leaching The results meet the emission threshold of the national environmental standards, and the dioxin toxicity equivalent is 0.015ng / Teq.

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Abstract

The invention discloses a waste incineration fly ash stabilizing agent and a synthetic method of the stabilizing agent. The stabilizing agent comprises, by mass, 25percent to 30percent of thiocarbamide, 40percent to 60percent of calcium bentonite, 15percent to 20percent of calcium phosphate, 10percent to 20percent of coal-fired power plant second class powered coal ash and 0percnet to 5percent of calcium formate. The method comprises the steps that all compositions are metered and borne according to the proportion and are dried to have the water content smaller than 1percent, and a dried mixed composition is obtained; the dried mixed composition is put into a sealed mixed stirring system to be mixed; and the stirred mixed composition is laminated and packaged through a packaging machine or pumped into a vacuum tank through an air pressure pump to be stored, and the stabilizing agent is obtained. The stabilizing agent can improve the fly ash treatment and disposal efficiency of a waste incineration enterprise, and can effectively stabilize heavy metal compositions in incineration fly ash; and heavy metal poisonousness dissolution is lower than the emission threshold value stipulated by national environmental protection, and the technical problems that in the prior art, a stabilizing agent is low in waste fly ash treatment efficiency, and does not meet the related emission standards of the national environment are solved.

Description

Technical field [0001] The invention relates to the technical field of environmental protection, in particular to a stabilizer for waste incineration fly ash and a synthesis method thereof. Background technique [0002] After the municipal waste is incinerated, the bottom of the waste heat boiler and the flue gas purification system will produce a large amount of waste incineration fly ash, which accounts for about 3% of the total weight of the primary waste (grate furnace). According to incomplete statistics, about 18 million tons of waste incineration nationwide in 2008 produced a total of about 540,000 tons of fly ash (Wuhan currently burns 8,000 to 10,000 tons per day). The waste incineration fly ash enriches most of the heavy metal elements, soluble salts and a certain amount of dioxins in the waste. Therefore, all countries classify the waste incineration fly ash as hazardous solid waste. After the promulgation of the "Pollution Control Standard for Domestic Waste Landfill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/30A62D101/08
CPCA62D3/30A62D2101/08
Inventor 朱书景玉晖
Owner 武汉钢铁有限公司