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Preparation of zeolite/mullite composite hollow microsphere by using fly-ash hollow microbead

A technology of hollow microspheres and hollow microspheres, applied in molecular sieves and alkali exchange compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of uneconomical and simple methods, zeolite is not very practical, waste of energy, etc., and achieve the goal of raw material resources High utilization rate, low price, environment-friendly effect

Inactive Publication Date: 2003-02-05
FUDAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports on the direct hydrothermal treatment of fly ash or indirect use of fly ash to synthesize zeolite in combination with other methods such as alkali fusion, but these methods or the prepared zeolite are not very practical, or the method is not economical and simple enough, such as the alkali fusion method requires a higher temperature, wastes a lot of energy

Method used

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example 1

[0022] Fly ash hollow microspheres (containing SiO2) provided by Henan Fly Ash Research Center 2 56.21%, Al 2 o 3 29.45%, the main crystal phase is mullite and quartz, select the hollow microspheres with a diameter of less than 100μm as an example), firstly adsorb a layer of FAU seed crystals with a size of about 100nm, and put 0.08g of fly ash hollow microspheres adsorbed with FAU seeds Mix it with 1ml of 2M NaOH solution and put it into a 15ml polytetrafluoroethylene-lined reaction kettle, seal it and crystallize at 100°C for 48 hours, wash and dry to obtain a sample, and XRD (Rigaku D / max-IIA x-ray powder Diffractometer) and SEM (Philips XL 30 Scanning Electron Microscope) characterization detection, XRD spectrum and SEM figure are shown in the accompanying drawings.

example 2

[0024] The LTA seed crystal with a size of about 200nm is used instead of the FAU variety, and the other experimental procedures are the same as above, and the XRD spectrum and SEM diagram are shown in the attached figure.

example 3

[0026] With 1ml aluminum-containing solution (NaOH:NaAlO 2 :H 2 O=9:1:250 molar ratio) replaces NaOH solution, and other experimental steps are with example 2, and XRD spectrum and SEM figure are shown in accompanying drawing.

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Abstract

The present invention relates to a method for preparing zeolite FAU / mullite and LTA / mullite composite zeolite hollow microspheres by using flyash hollow microbeads as raw material and utilizing crystal seed induction in-situ hydrothermal crystallization process. The flyash is a solid waste, and contains lots of glass body with hollow structure, called flyash hollow microbeads. Said invention uses two different small granular zeolites of FAU and LTA as crystal seed, and makes them implement hydrothermal crystallization in NaOH alkali solution containing aluminium or containing no aluminium, and makes the active silicon aluminium components in the flyash hollow microbead crystallize into zeolite, and the inert mullite can not be converted, the original hollow structure can be retained so as to can obtain the composite hollow microspheres supported by outer-layer compact zeolite membrane.

Description

technical field [0001] The invention is a method for preparing zeolite FAU / mullite and LTA / mullite composite hollow microspheres by using fly ash hollow microspheres as raw material seed crystals to induce in-situ hydrothermal crystallization. Hollow zeolite microspheres are a new type of material with low density, high specific surface area, good thermal stability, and good surface permeability. Capsules and the like have been applied. Background technique [0002] Fly ash is fine dust emitted by burning solid fuels in coal-fired power plants. The amount is large. Improper treatment will increase the smoke and pollute the atmosphere; if the discharged solid waste is discharged into the water system, it will cause river silting. The harmful Substances can also pose hazards to humans and living organisms. China's coal-fired power plants emit a large amount of ash every year, and the ash accumulated over the years not only seriously pollutes the environment, but also occupie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/50
Inventor 王德举唐颐夏建超
Owner FUDAN UNIV
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