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A composite stabilizer for stabilizing heavy metals in waste incineration fly ash and preparation method thereof

A waste incineration fly ash and composite stabilizer technology, which is applied in the protection device against harmful chemicals, etc., can solve the problems of large amount of organic stabilizer, insufficient acid resistance, etc., and achieve the effect of strong resistance to acid and alkali impact

Active Publication Date: 2017-04-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to overcome the disadvantages of the existing inorganic stabilizers and most organic stabilizers with large dosage and insufficient acid resistance, and to provide a novel structural stabilizer with good stability to heavy metals in fly ash and strong ability to resist acid and alkali. To control the cost of waste incineration fly ash stabilization treatment and meet the long-term safety requirements of fly ash treatment

Method used

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  • A composite stabilizer for stabilizing heavy metals in waste incineration fly ash and preparation method thereof
  • A composite stabilizer for stabilizing heavy metals in waste incineration fly ash and preparation method thereof
  • A composite stabilizer for stabilizing heavy metals in waste incineration fly ash and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: the preparation of composite stabilizer

[0058] Add 29.40g (0.3mol) maleic anhydride (MA) into a four-necked flask with stirring, reflux condenser and thermometer, then add 29.40g dimethylformamide solution (DMF), and stir until the maleic anhydride dissolves , Nitrogen, 29.80g (50%, 0.1mol) DMF solution of triethanolamine (TEA) was added dropwise, and the rate of addition was controlled so that the temperature was less than 25°C. After the dropwise addition, stir for 30 minutes, raise the temperature to 85° C., and react for 5 hours to obtain a triethanolamine core maleic acid-terminated star polymer (TEA / MA-3COOH). Then cool down to less than 10°C, slowly add 24.00g (50%, 0.3mol) of sodium hydroxide solution dropwise, and a white solid will form, filter it with suction, rinse twice with ethanol, and dry in vacuo to obtain 50.81g of triethanolamine-cored horseradish Sodium acid-terminated star-shaped hyperbranched polymer (TEA / MA-3COONa, yield 99.82%). ...

Embodiment 2

[0063] Embodiment 2: the preparation of composite stabilizer

[0064] Add 45.08g (0.46mol) maleic anhydride (MA) into a four-neck flask with stirring, reflux condenser and thermometer, then add 45.08g dimethylformamide solution (DMF), and stir until the maleic anhydride dissolves , Nitrogen, dropwise added 44.70g (50%, 0.15mol) DMF solution of triethanolamine (TEA), control the rate of addition so that the temperature is less than 25 ° C. After the dropwise addition, stir for 30 minutes, raise the temperature to 85° C., and react for 7 hours to obtain a triethanolamine-core maleic acid-terminated star polymer (TEA / MA-3COOH). Then cool down to 10°C, slowly add 36.80g (50%, 0.46mol) of sodium hydroxide aqueous solution dropwise, and a white solid will form, filter with suction, rinse twice with ethanol, and dry in vacuo to obtain 73.92g of triethanolamine cored horseradish Sodium acid-terminated star hyperbranched polymer (TEA / MA-3COONa, yield 96.82%), set aside.

[0065] Add ...

Embodiment 3

[0069] Embodiment 3: the preparation of composite stabilizer

[0070] Add 35.28g (0.36mol) maleic anhydride (MA) into a four-neck flask with stirring, reflux condenser and thermometer, then add 35.28g dimethylformamide solution (DMF), and stir until the maleic anhydride dissolves , Nitrogen, dropwise added 35.76g (50%, 0.12mol) DMF solution of triethanolamine (TEA), control the rate of addition so that the temperature is less than 25 ° C. After the dropwise addition, stir for 30 minutes, raise the temperature to 85° C., and react for 5 hours to obtain a triethanolamine core maleic acid-terminated star polymer (TEA / MA-3COOH). Then cool down to less than 10°C, slowly add 28.80g (50%, 0.36mol) of sodium hydroxide solution dropwise, and a white solid will form, filter it with suction, rinse twice with ethanol, and dry in vacuo to obtain 60.13g of triethanolamine-cored horseradish Sodium acid-terminated star-shaped hyperbranched polymer (TEA / MA-3COONa, yield 97.29%).

[0071] Add...

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Abstract

The invention relates to a compound stabilizer for stabilizing heavy metals in fly ash generated by waste incineration and a preparation method of the compound stabilizer. The compound stabilizer is prepared from triethanolamine / maleic anhydride / ethylenediamine (TME / MA / ADA-3COONa) and ADA-4CSSNa, wherein TME / MA / ADA-3COONa takes triethanolamine as a core and has a sodium dicarboxylic acid side group and a sodium dithioacid end group, the chemical formula of TME / MA / ADA-3COONa is N[CH2CH2OCOCH2CH2(COONa)N(CSSNa)CH2(CH2)nCH2N(CSSNa)2]3, and n is a positive integer from 0 to 4; the chemical formula of ADA-4CSSNa is (NaSSC)2NCH2(CH2)nCH2N(CSSNa)2, and n is a positive integer from 0 to 4. The compound stabilizer has effective stabilizing action to heavy metals in fly ash generated by waste incineration; with the adoption of the compound stabilizer, the stabilizing treatment is simple in method, the dosage is little, the cost is low, secondary pollution does not exist, and the heavy metal leaching concentration of a fly ash stabilizing product is lower than that in a national stipulation on hazardous waste leaching toxicity; in addition, the compound stabilizer is good in acid and alkali resistance and can be used for lowering the risk that fly ash pollutes the environment after existing in natural environment for a long time.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and in particular relates to a composite stabilizer for stabilizing heavy metals in waste incineration fly ash and a preparation method thereof. Background technique [0002] In recent years, the phenomenon of "garbage siege" has spread all over the world. Because of its advantages of small footprint, maximum waste reduction, harmlessness, and resource utilization, incineration has increasingly become a waste treatment method commonly used by developed countries in the world. Treatment technology is also the main policy of the Chinese government to deal with the phenomenon of "garbage siege". With the increasingly serious phenomenon of "garbage siege", my country's waste incineration scale has also increased year by year, from 3.699 million tons in 2003 to 35.84 million tons in 2012, an increase of 969%. In 2015, the scale of waste incineration in my countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/08A62D101/43
Inventor 张冰如李风亭田志鹏
Owner TONGJI UNIV