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A kind of method utilizing fly ash and active carbon to synthesize sodium type zeolite

A technology for sodium-type zeolite and fly ash, which is applied in the synthesis field of sodium-type zeolite, can solve the problems of low zeolite purity and poor ion exchange performance, and achieve the effects of increasing pore volume, increasing reaction activity, and refining particles

Active Publication Date: 2017-11-17
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] A variety of zeolites can be synthesized by traditional hydrothermal synthesis methods, such as sodium zeolite, analcite and chabazite, etc., but the obtained zeolites are generally a mixture of various zeolites, and their ion exchange performance is poor, so their applications are limited. and mullite crystal phases still exist, and the resulting zeolite has a lower purity

Method used

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  • A kind of method utilizing fly ash and active carbon to synthesize sodium type zeolite
  • A kind of method utilizing fly ash and active carbon to synthesize sodium type zeolite
  • A kind of method utilizing fly ash and active carbon to synthesize sodium type zeolite

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specific Embodiment 1

[0034] A kind of method that utilizes fly ash and activated carbon to synthesize sodium-type zeolite that the present embodiment provides, comprises the following steps:

[0035] Step 1, crushing: Carry out ball milling to fly ash, sieve standby; The mass percentage content of silicon dioxide and aluminum oxide in the fly ash raw material ≥ 80%, silicon dioxide and aluminum oxide in the fly ash raw material The ratio of the amount of aluminum is 3:1; and the particle size of the fly ash obtained in step 1 is ≤200 mesh.

[0036] Step 2. Calcination: put the fly ash obtained in step 1 into a muffle furnace for calcination, take it out and cool it for later use; for 2 hours.

[0037] Step 3, iron removal: mix the fly ash obtained in step 2 with hydrochloric acid solution, filter after heating and stirring, wash with water until neutral, and dry for later use; the concentration of hydrochloric acid solution is 10%, and the pulverized coal obtained in step 2 The mixing ratio of a...

specific Embodiment 2

[0043] A kind of method that utilizes fly ash and activated carbon to synthesize sodium-type zeolite that the present embodiment provides, comprises the following steps:

[0044] Steps 1 to 4 are the same as Steps 1 to 4 in Example 1.

[0045] Step 5, adding activated carbon: add activated carbon to the fly ash obtained in step 4, and mix it for later use; the mixing mass ratio of the fly ash and activated carbon obtained in step 4 is 2:1, and the particle size of the activated carbon is ≤ 200 mesh .

[0046] Step 6, crystallization: mix the mixture prepared in step 5 with sodium hydroxide solution, stir and age at room temperature for later use; the concentration of sodium hydroxide solution is 4 mol / L; the mixture prepared in step 5 is mixed with hydroxide The mixing ratio of the sodium solution is that every gram of the mixture prepared in Step 5 corresponds to 5 milliliters of sodium hydroxide solution; the aging time with stirring at room temperature is 6 hours.

[0047...

specific Embodiment 3

[0049] A kind of method that utilizes fly ash and activated carbon to synthesize sodium-type zeolite that the present embodiment provides, comprises the following steps:

[0050] Steps 1 to 4 are the same as Steps 1 to 4 in Example 1.

[0051] Step 5, adding activated carbon: add activated carbon to the fly ash obtained in step 4, and mix it for later use; the mixing mass ratio of the fly ash and activated carbon obtained in step 4 is 4: 1, and the particle size of the activated carbon is ≤ 200 mesh .

[0052] Step 6, crystallization: mix the mixture prepared in step 5 with sodium hydroxide solution, stir and age at room temperature for later use; the concentration of sodium hydroxide solution is 2 mol / L; the mixture prepared in step 5 is mixed with hydroxide The mixing ratio of the sodium solution is that every gram of the mixture prepared in Step 5 corresponds to 15 milliliters of sodium hydroxide solution; the aging time with stirring at room temperature is 24 hours.

[0...

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Abstract

The invention discloses a method for synthesizing sodium type zeolite from fly ash and active carbon. The method comprises the following steps: 1, crushing: carrying out ball milling on the fly ash, and sieving the ball-milled fly ash for later use; 2, calcining: calcining the fly ash in a muffle furnace, taking out the calcined fly ash, and cooling the fly ash; 3, removing iron: mixing the fly ash with a hydrochloric acid solution, heating and stirring the obtained mixture, filtering the heated and stirred mixture, washing the filtered mixture with water until neutrality, and drying the washed mixture for later use; 4, ageing: uniformly mixing the fly ash with sodium carbonate, calcining the obtained mixture in the muffle furnace, taking out the calcined mixture, cooling the mixture, and carrying out fine grinding on the cooled mixture; 5, adding active carbon: adding the active carbon to the fly ash, and mixing to obtain a mixture for later use; 6, crystallizing: mixing the mixture obtained in step 5 with a sodium hydroxide solution, and stirring and ageing the obtained mixture at room temperature; and 7, washing and drying: placing the mixture obtained in step 6 in a reaction kettle, heating and crystallizing the mixture, washing the crystallized mixture with water, and drying the washed mixture to prepare the sodium type zeolite. The sodium type zeolite synthesized in the invention has the advantages of large surface area, strong adsorption ability, increased pore volume and large cation exchange amount.

Description

technical field [0001] The invention relates to a method for synthesizing sodium-type zeolite by using fly ash and activated carbon, and belongs to the technical field of synthesis methods of sodium-type zeolite. Background technique [0002] Fly ash is a fine powdery solid waste discharged from coal-fired thermal power plants. Except for some raw materials for building bricks, cement raw materials, roadbed materials, soil improvers and rubber fillers, most of them are stacked in the open air, causing air pollution, water pollution, etc. Environmental issues such as pollution. Therefore, the use of fly ash to prepare zeolite has positive significance for expanding the comprehensive utilization of fly ash, realizing waste treatment and turning waste into treasure, and has multiple benefits such as good environment, ecology, society and economy, and can be Synthetic zeolites provide inexpensive raw materials. [0003] Activated carbon is a kind of very fine carbon particles,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/52
CPCC01B39/52C01P2002/72C01P2004/61C01P2006/10C01P2006/12C01P2006/14C01P2006/80
Inventor 郑永红张治国胡友彪邢明明王涵霏李璋琦蔡晓霜
Owner ANHUI UNIV OF SCI & TECH
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