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Waste incineration power generation fly ash solidification method

A fly ash solidification and waste incineration technology, which is applied in the direction of solid waste removal, etc., can solve the problems of low long-term solidification stability, large volume increase of solidified body, and poor stability of solidified body, so as to improve strength and reduce Effect of leaching and improving binding force

Active Publication Date: 2021-09-17
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to maintain high strength and long-term stability of the solidified body, the amount of cement required for cement solidification is very high, resulting in a large increase in the volume of the solidified body formed after curing treatment, increasing the demand for the capacity of the landfill site ; Moreover, after the solidified body is formed, the internal fly ash will still release impurity components to participate in the reaction, which will erode the solidified body, and the stability of the solidified body is not good, so its long-term curing stability is not high

Method used

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  • Waste incineration power generation fly ash solidification method

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Embodiment 1

[0021] A method for solidifying fly ash of waste incineration power generation, comprising the following steps:

[0022] S1. After mixing the fly ash, phosphate rock powder and the hydrolyzate of the silane coupling agent containing epoxy groups, let it stand for reaction and dry to obtain the fly ash premix;

[0023] S2. After mixing the fly ash premix with an aqueous solution of gelatin, heat, stir and react, and dry to obtain a fly ash mixture;

[0024] S3. After the fly ash mixture is mixed with cement, an appropriate amount of water is added and stirred evenly, and left to stand in a mold for curing to form a solidified body.

Embodiment 2

[0026] A method for solidifying fly ash of waste incineration power generation, comprising the following steps:

[0027] S1. Mix 0.1kg of silane coupling agent KH-560, 0.8kg of ethanol, and 0.3kg of water, stir evenly, and let it stand for 1 hour to obtain the hydrolyzate of silane coupling agent KH-560. Mix 10kg of fly ash and 1.5kg of phosphate rock After mixing the powder with the hydrolyzed solution of silane coupling agent KH-560 prepared above, let it stand for reaction for 1 hour, and then dry it at 60°C to obtain the fly ash premix;

[0028] S2. Dissolving 0.1 kg of gelatin in water to obtain a gelatin aqueous solution with a concentration of 10 g / L, then mixing the fly ash premix with the above-mentioned prepared gelatin aqueous solution, heating and stirring at 60° C. for 4 hours, and then Drying at 60°C to obtain a fly ash mixture;

[0029] S3. After mixing the fly ash mixture and cement at a weight ratio of 3:7, add an appropriate amount of water and stir evenly, ...

Embodiment 3

[0031] A method for solidifying fly ash of waste incineration power generation, comprising the following steps:

[0032] S1. Mix 0.2kg of silane coupling agent KH-560, 2.4kg of ethanol, and 1.2kg of water, stir evenly, and let stand for 2 hours to obtain the hydrolyzate of silane coupling agent KH-560. Mix 10kg of fly ash, 2.5kg of phosphate rock After mixing the powder with the hydrolyzed solution of silane coupling agent KH-560 prepared above, let it stand for reaction for 2 hours, and then dry it at 80°C to obtain the fly ash premix;

[0033] S2. Dissolving 0.2kg of gelatin in water to obtain a gelatin aqueous solution with a concentration of 20g / L, then mixing the fly ash premix with the above-mentioned prepared gelatin aqueous solution, heating and stirring at 80°C for 2 hours, and then Drying at 80°C to obtain a fly ash mixture;

[0034] S3. After mixing the fly ash mixture and cement at a weight ratio of 6:4, add an appropriate amount of water and stir evenly, and leav...

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Abstract

The invention discloses a waste incineration power generation fly ash solidification method which comprises the following steps: S1, mixing fly ash, ground phosphate rock and hydrolysate of a silane coupling agent containing an epoxy group, standing for reaction, and drying to obtain a fly ash premix; s2, mixing the fly ash premix with an aqueous solution of gelatin, heating and stirring for reaction, and drying to obtain a fly ash mixture; and S3, mixing the fly ash mixture with cement, adding a proper amount of water, uniformly stirring, and standing and curing in a mold to form a cured body. According to the solidification method, the compressive strength of the fly ash cement solidification body can be improved, the leaching property of heavy metal impurities in the solidification body is reduced, the obtained solidification body can meet the requirement for being used as a building material under the condition that the fly ash is high in mixing amount, efficient, energy-saving and economical recycling of the waste incineration power generation fly ash is facilitated, and the economic benefit is increased. The actual use requirements are met.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a method for solidifying fly ash for waste incineration power generation. Background technique [0002] With the acceleration of urbanization, the disposal of a large amount of domestic waste generated by urban life has become an important issue. Waste incineration power generation is a technology that incinerates solid waste and then generates electricity through steam generators. It can not only process municipal solid waste, but also recover energy from waste, and has been widely used. However, waste incineration power generation will produce a large amount of fly ash, which contains heavy metal pollutants such as Pb and Cr. These heavy metals are often attached to the fly ash in soluble form, which poses a major threat to the environment. Therefore, it is necessary to solidify the incineration fly ash before landfilling it. [0003] Cement solidification is a method...

Claims

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Application Information

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IPC IPC(8): C04B28/02B09B3/00
CPCC04B28/02C04B2201/50C04B2111/00017C04B18/08C04B18/12C04B24/42C04B24/38C04B24/026Y02W30/91
Inventor 朱仁发
Owner HEFEI UNIV
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