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Method for preparing nano flyash zeolite

The technology of fly ash zeolite and fly ash is applied in the field of preparation of fly ash synthetic zeolite, and achieves the effects of saving resources, eliminating environmental damage and being cheap.

Inactive Publication Date: 2012-09-05
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of synthesis method of the nano fly ash zeolite that saves energy, reduces production cost, prepares fly ash zeolite with coal-fired power plant waste fly ash and seawater desalination plant waste concentrated seawater as raw materials, both Solve the environmental problems caused by the discharge of fly ash concentrated seawater, save the cost of distilled water in the production process, and realize the resource utilization of fly ash

Method used

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  • Method for preparing nano flyash zeolite
  • Method for preparing nano flyash zeolite
  • Method for preparing nano flyash zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Accurately weigh amorphous SiO 2 and Al 2 o 3 5g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was uniformly mixed with 5g of NaOH, and then placed in a muffle furnace for calcination at 500°C for 1.5h to obtain clinker. Add 80ml of concentrated seawater with a salinity of 42‰ to the obtained clinker, and stir at room temperature for 24 hours to obtain silica-alumina gel. The prepared silica-alumina gel was hydrothermally reacted at 60°C for 72 hours. After the reaction, the solid-liquid separation was carried out, and the sample was washed to near neutrality and dried to obtain a sample. The obtained zeolite was NaX type zeolite, which was detected by X-ray diffraction. See the attached picture for the picture. The average particle diameter of the obtained zeolite was measured to be 77.5 nm. Ammonium acetate method measures the cation exchange capacity of product to be 394.0642mmol / 100g, figure 1 It is the X-ray diffraction pattern of th...

Embodiment 2

[0019] Accurately weigh amorphous SiO 2 and Al 2 o 3 5g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was mixed with 6g of NaOH and placed in a muffle furnace for calcination at 550°C for 2 hours to obtain clinker. Add 55ml of concentrated seawater with a salinity of 76‰ to the clinker, and stir at room temperature for 24 hours to obtain a silica-alumina gel. The prepared silica-alumina gel was placed in a polyethylene-lined stainless steel reactor, sealed and crystallized under autogenous pressure at 100°C for 6 hours, then centrifuged to separate the solid from the liquid, and washed repeatedly with deionized water until the pH of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80°C for 12 hours, and then ground into powder. X-ray diffraction characterization analysis shows that the product is a mixture of NaX type zeolite and hydroxy sodalite, and the X-ray diffraction diagram is shown in the accompa...

Embodiment 3

[0021] Accurately weigh amorphous SiO 2 and Al 2 o 3 10g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was mixed with 12g of NaOH and placed in a muffle furnace for calcination at 550°C for 2 hours to obtain clinker. Add 110ml of concentrated seawater with a salinity of 88‰ to the clinker, and stir at room temperature for 24 hours to obtain a silica-alumina gel. The prepared silica-alumina gel was placed in a polyethylene-lined stainless steel reactor, sealed and crystallized under autogenous pressure at 100°C for 6 hours, then centrifuged to separate the solid from the liquid, and washed repeatedly with deionized water until the pH of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80°C for 12 hours, and then ground into powder. X-ray diffraction characterization analysis shows that the product is hydroxy sodalite. The cation exchange capacity of the product measured by the ammonium acetate method is 2...

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Abstract

The invention relates to a method for preparing nano flyash zeolite. Flyash is used as a raw material in the method, and the method comprises the following steps of: firstly melting the flyash and sodium hydroxide at high temperature; mixing the molten flyash with concentrated seawater used as a solvent, stirring and aging to obtain silica-alumina gel; crystallizing the silica-alumina gel hydrothermally, and then washing with water to be neutral; and finally drying to obtain a powdery product. Based on the special aperture structure of zeolite, the synthesized zeolite can be applied to catalysis, adsorption, ion exchange and soil improvement. By using the flyash and the concentrated seawater which are both wastes, the method realizes the recycling of the flyash and the concentrated seawater and is a new environment-friendly production method which meets the requirement of sustainable development.

Description

technical field [0001] The invention relates to a method for preparing zeolite synthesized from fly ash, which is a method for preparing nano fly ash zeolite by using fly ash waste from a coal-fired power plant and concentrated seawater from a seawater desalination plant as raw materials. Background technique [0002] Fly ash is solid waste discharged from coal-fired power plants. With the development of the power industry, the discharge of fly ash is increasing year by year. Except for some used in cement production, concrete and other construction industries, most of them are piled on site or filled. Buried, occupying a large amount of land and causing environmental pollution. Concentrated seawater refers to the part of seawater that is concentrated about twice as much after fresh water is extracted by desalination technology; and the seawater circulation cooling technology is adopted. When used as industrial cooling water, the water in seawater gradually evaporates, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02B09B3/00
Inventor 朱校斌于艳卿邹晓兰李超峰王新亭
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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