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A kind of fly ash synthetic zeolite and its preparation method and application

A technology for synthesizing zeolite and fly ash, applied in the field of selenium fertilizer

Active Publication Date: 2021-12-10
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has strict requirements on the selenium content in the fly ash used, and the fly ash discharged from most coal-fired power plants in my country cannot meet this standard

Method used

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  • A kind of fly ash synthetic zeolite and its preparation method and application
  • A kind of fly ash synthetic zeolite and its preparation method and application
  • A kind of fly ash synthetic zeolite and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation of embodiment 1 fly ash synthetic zeolite

[0030] 1. Preparation of fly ash synthetic zeolite

[0031] The zeolite was synthesized by alkali fusion-hydrothermal method, and the specific synthesis process was as follows: Accurately weighed 12g of sodium hydroxide (analytical pure) solid and 10g of fly ash, put them into a pulverizer and mixed them evenly, and then put the mixture into a 600°C horsepower Melt in a Furnace for 3 hours, take it out after cooling and pulverize the melt, weigh it and add the mixture into distilled water according to the ratio of solid to liquid 17.25%, then put it into a constant temperature water bath and stir slowly at 80°C for 2 hours. After taking it out, put it into a reaction kettle and place it in an oven at 100°C for 9 hours to crystallize. Take out the solid and wash it with distilled water until the pH is 9-10, then place it in a watch glass and put it in an oven at 100°C for 12 hours.

[0032] 2. Characterization...

Embodiment 2

[0039] The specific application of embodiment 2 fly ash synthetic zeolite as adsorbent

[0040] 1. Adsorption

[0041] Sodium selenite (Na2SeO3), synthetic zeolite from fly ash, and water are used to configure a solution in a ratio of 219:500:10000, and the pH of the solution is adjusted to 2.0±0.05. The mixed solution was shaken and adsorbed at 25°C and 150rpm in a constant temperature shaking incubator for 6h. After shaking the adsorption equilibrium, the mixture was centrifuged, and the adsorbed saturated solid was taken out and dried in a constant temperature oven at 100°C for 12 hours, and then ground into a powder for future use.

[0042] 2. Desorption (release)

[0043] The adsorption saturated zeolite product and water were formulated into a solution at a ratio of 1:200, the pH of the solution was adjusted to about 7, and the mixed solution was shaken and released at 25°C and 150rpm in a constant temperature shaking incubator for 6 hours. Then spray the solution eve...

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Abstract

The invention relates to a fly ash synthetic zeolite and its preparation method and application. The fly ash synthetic zeolite comprises the following components by weight: 9-11 parts of fly ash, 11-13 parts of sodium hydroxide, and 120-130 parts of water. The fly ash synthetic zeolite of the present invention has the characteristics of strong adsorption and strong desorption, not only can effectively remove the selenium element in the waste water, but also use the adsorbed saturated product to release again, so as to realize the purpose of soil selenium enrichment.

Description

technical field [0001] The invention relates to a fly ash synthetic zeolite and its preparation method and application, belonging to the technical field of selenium fertilizer. Background technique [0002] Selenium is a very important trace element in the ecological environment. It exists in various forms in the soil. Among them, tetravalent selenium (such as selenite) is not only easily soluble in water, but also easily absorbed and utilized by plants. The main form is also the main form for plants to absorb soil inorganic selenium. However, due to the low selenium content in most of the soil in our country, it is necessary to enrich the soil by artificial technology to make it more widely used in agricultural products. [0003] Most of the existing methods for increasing the selenium content in the soil are based on fertilization, which uses selenium-containing active complex substances to evenly exist in the soil to achieve the effect of soil selenium enrichment. For e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30B01J20/34C02F1/28C09K17/02C09K101/00
CPCB01J20/18C09K17/02C02F1/281B01J20/3475C09K2101/00
Inventor 冀晓东彭绍好张凡马媛媛李鑫媛
Owner BEIJING FORESTRY UNIVERSITY
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