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Fly ash and coal ash hydrothermal reaction solid-liquid phase product cooperative treatment method

A hydrothermal reaction and synergistic treatment technology, applied in chemical/physical processes, ion exchange treatment devices, silicon compounds, etc., can solve the problems of reducing the concentration of heavy metals and unable to reduce the content of heavy metals in hydrothermal liquids

Inactive Publication Date: 2021-06-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problem that the hydrothermal treatment method in the prior art cannot reduce the heavy metal content in the hydrothermal liquid while reducing the concentration of heavy metals in the hydrothermal solid product, the present invention provides a fly ash fly ash hydrothermal reaction solid-liquid phase product The method of synergistic treatment, by rationally designing the composition of the treatment agent and the conditions of hydrothermal treatment, can effectively solve the problem that the heavy metal content in the hydrothermal liquid cannot be reduced while reducing the concentration of heavy metals in the hydrothermal solid phase product.

Method used

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  • Fly ash and coal ash hydrothermal reaction solid-liquid phase product cooperative treatment method
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  • Fly ash and coal ash hydrothermal reaction solid-liquid phase product cooperative treatment method

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Embodiment 1

[0048] This embodiment provides a method for synergistic treatment of fly ash and fly ash hydrothermal reaction solid-liquid phase products, and its specific steps are:

[0049] (1) Evenly mix fly ash and fly ash in a ratio of 9:1;

[0050] (2) Add the reaction solution to the mixture in step (1), and mix it uniformly to form a precursor solution; the mixing method is: place the precursor solution at room temperature and stir at a rate of 900r / min for 6 hours, and then ultrasonically treat it for 3 hours to make the mixture The mortar is evenly distributed;

[0051] (3) Seal the precursor solution in the step (2) in a reaction kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 160° C., and the time is 36 hours.

[0052] It should be noted that the treatment agent used in this example is a distilled ammonia solution with a pH of 12.86, and the distilled ammonia solution includes sodium hydroxide, ammonia water, 43.6 mg / L calcium chloride, 34.4 mg...

Embodiment 2

[0055] This example provides a method for synergistic processing of fly ash and fly ash hydrothermal reaction solid-liquid phase products, its specific implementation is basically the same as Example 1, the main difference is: fly ash and fly ash in this example Mix evenly at a ratio of 8:2.

[0056] After the reaction, the reactor was naturally cooled to room temperature, and the reaction product was separated into solid and liquid with filter paper, and the separated solid was dried at 60°C to constant weight for further analysis. Finally, the original fly ash, fly ash and hydrothermal products were analyzed for heavy metal leaching toxicity, heavy metal content, heavy metal form distribution, heavy metal content and pH in hydrothermal liquid, in order to judge the effect of hydrothermal stabilization of heavy metals, and the final hydrothermal solid product And the test of the heavy metal content in the hydrothermal liquid is shown in Table 5 and Table 6, and the hydrotherm...

Embodiment 3

[0058] This example provides a method for synergistic processing of fly ash and fly ash hydrothermal reaction solid-liquid phase products, its specific implementation is basically the same as Example 1, the main difference is: fly ash and fly ash in this example Mix evenly in a ratio of 7:3.

[0059] After the reaction, the reactor was naturally cooled to room temperature, and the reaction product was separated into solid and liquid with filter paper, and the separated solid was dried at 60°C to constant weight for further analysis. Finally, the original fly ash, fly ash and hydrothermal products were analyzed for heavy metal leaching toxicity, heavy metal content, heavy metal form distribution, heavy metal content and pH in hydrothermal liquid, in order to judge the effect of hydrothermal stabilization of heavy metals, and the final hydrothermal solid product And the test of the heavy metal content in the hydrothermal liquid is shown in Table 5 and Table 6, and the hydrotherm...

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Abstract

The invention discloses a fly ash and coal ash hydrothermal reaction solid-liquid phase product cooperative treatment method, and belongs to the technical field of fly ash hydrothermal treatment. The method comprises the following steps: mixing fly ash, coal ash, a treating agent and ultrapure water, and carrying out hydrothermal treatment; the pH value of the treating agent is 11-13, the treating agent comprises a treating agent A, and the treating agent A is an alkaline solution with the ionization equilibrium constant KA larger than 0.05; the treatment agent B is an alkaline solution of which the ionization equilibrium constant KB of primary ionization is equal to 10 <-6 >-10 <-3 >; the treatment agent C is Ca < 2 + > salt with the concentration from 10 <-5 > mol / L to 10 <-3 > mol / L. According to the method, the heavy metal content in the hydrothermal liquid can be effectively reduced while the heavy metal concentration in the hydrothermal solid-phase product is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrothermal treatment of fly ash, and more specifically relates to a method for synergistic treatment of solid-liquid phase products of fly ash and fly ash hydrothermal reaction. Background technique [0002] The traditional hydrothermal method for stabilizing heavy metals in waste incineration fly ash is mainly due to the stabilization of heavy metals by zeolite-like substances synthesized during the reaction process, including ion adsorption, ion exchange precipitation, and physical encapsulation. The synthesis of zeolite-like substances can effectively prevent the infiltration of heavy metals in the hydrothermal process, and the stabilized fly ash has a certain acid resistance, so it can be reused as an acid neutralizer. At present, many studies have shown that various zeolites, such as phillipsite, zeolite P, chabazite analcite, calcium zeolite, etc., can be obtained from fly ash by hydrothermal trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D3/30B01D15/08B01J20/10C01B33/24A62D101/08A62D101/43
CPCA62D3/30A62D3/33A62D2101/08A62D2101/43B01D15/08B01J20/10C01B33/24
Inventor 孙秀云圣楠孙晓蕾韩卫清王连军李健生沈锦优刘晓东
Owner NANJING UNIV OF SCI & TECH
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