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Method for preparing nano flyash zeolite

A technology for fly ash zeolite and fly ash is applied in the field of preparation of fly ash synthetic zeolite to achieve the effects of eliminating environmental damage, saving costs and being easy to operate.

Inactive Publication Date: 2011-03-30
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
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  • Method for preparing nano flyash zeolite

Examples

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Effect test

Embodiment 1

[0017] Accurately Weighing Amorphous SiO 2 and Al 2 O 3 5g of power plant fly ash with a content 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. 80 ml of concentrated seawater with a salinity of 42‰ was added to the obtained clinker, and the mixture was stirred at room temperature for 24 hours to obtain a silica-alumina gel. The prepared silica-alumina gel was hydrothermally reacted at 60 °C for 72 hours, and after the reaction, solid-liquid separation was carried out, washed with water to near neutrality, and dried to obtain a sample, which was characterized by X-ray diffraction. The obtained zeolite was NaX type zeolite. X-ray diffraction See attached picture. The average particle diameter of the obtained zeolite was measured to be 77.5 nm. The cation exchange capacity of the product determined by the ammonium acetate method was 394.0642 mmol / 100g, figure 1 T...

Embodiment 2

[0019] Accurately Weighing Amorphous SiO 2 and Al 2 O 3 5g of power plant fly ash with a content of 45.46% and 26.38% respectively, mixed with 6g of NaOH and placed in a muffle furnace for calcination at 550°C for 2h to obtain clinker. Add 55ml of concentrated seawater with a salinity of 76‰ to the clinker, and stir at room temperature for 24h to obtain 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 h, and then subjected to solid-liquid centrifugation, and repeatedly washed with deionized water until the pH value of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80° C. for 12 hours, and ground into powder. X-ray diffraction characterization analysis shows that the product is a mixture of NaX-type zeolite and hydroxysodalite, and the X-ray diffraction pattern is shown in the accompanying drawing. The...

Embodiment 3

[0021] Accurately Weighing Amorphous SiO 2 and Al 2 O 3 10g of power plant fly ash with a content of 45.46% and 26.38% respectively, mixed with 12g of NaOH and calcined at 550°C for 2h in a muffle furnace to obtain clinker. Add 110 ml of concentrated seawater with a salinity of 88‰ to the clinker, and stir at room temperature for 24 hours to obtain 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 h, and then subjected to solid-liquid centrifugation, and repeatedly washed with deionized water until the pH value of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80° C. for 12 hours, and ground into powder. X-ray diffraction analysis shows that the product is hydroxysodalite, the cation exchange capacity of the product is 262.4004mmol / 100g determined by ammonium acetate method, and the zeolite product is a...

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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 preparation method of fly ash synthetic zeolite, which uses the waste fly ash of coal-fired power plants and the waste concentrated seawater produced by seawater desalination plants as raw materials to prepare nano fly ash zeolite. Background technique [0002] Fly ash is a 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 of them used in cement production, concrete and other construction industries, most of them are stacked or filled on site. Buried disposal takes up a lot of land and causes environmental pollution. Concentrated seawater refers to the part of the seawater that is about doubled after the freshwater is extracted by desalination technology; and the use of seawater circulation cooling technology, when used as industrial cooling water, the water in seawater gradually evaporates, and the concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(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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