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Method for preparing magnetic 4A molecular sieve by using kaolin

A technology of kaolin and molecular sieve, which is applied in the field of preparing magnetic 4A molecular sieve, can solve the problem of difficult separation of fine powder zeolite products, and achieve the effects of magnetic stability, low price and wide source of raw materials

Inactive Publication Date: 2013-02-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention uses cheap kaolin as raw material, adopts the traditional hydrothermal synthesis method, and solves the problem of difficult separation of fine powder zeolite products in wastewater treatment by adding magnetic materials, so as to achieve the purpose of recycling

Method used

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  • Method for preparing magnetic 4A molecular sieve by using kaolin
  • Method for preparing magnetic 4A molecular sieve by using kaolin
  • Method for preparing magnetic 4A molecular sieve by using kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Pretreatment

[0024] The kaolin is crushed and ground and then magnetically separated, and the magnetically separated kaolin is passed through a 200-mesh sieve to obtain powder.

[0025] 2. Preparation of magnetic carrier

[0026] FeCl 2 and FeCl 3 Mix at a molar ratio of 1:2 and prepare a mixed solution with a total iron concentration of 0.5mol / L with deionized water. After stirring evenly, adjust the pH value to 10 with ammonia water with a mass concentration of 25%, and stir and react at 65°C for 2 hours. Then heat up to 90°C and let it stand for crystallization for 4 hours, and use a magnet to move the Fe 3 o 4 The crystals were separated and collected, washed with deionized water until neutral, and dried to obtain a magnetic carrier; the Fe 3 o 4 Prepare the magnetic fluid with deionized water, so that the magnetic carrier can be integrated into it during the molecular sieve synthesis process;

[0027] 3. Alkali-soluble roasting

[0028] Add sodium hydr...

Embodiment 2

[0036] 1. Pretreatment

[0037] The kaolin is crushed and ground and then magnetically separated, and the magnetically separated kaolin is passed through a 200-mesh sieve to obtain powder.

[0038] 2. Preparation of magnetic carrier

[0039] FeCl 2 and FeCl3 Mix at a molar ratio of 1:2 and prepare a mixed solution with a total iron concentration of 0.5mol / L with deionized water. After stirring evenly, adjust the pH value to 10 with ammonia water with a mass concentration of 25%, and stir and react at 65°C for 2 hours. Then heat up to 90°C and let it stand for crystallization for 4 hours, and use a magnet to move the Fe 3 o 4 The crystals were separated and collected, washed with deionized water until neutral, and dried to obtain a magnetic carrier; the Fe 3 o 4 Prepare the magnetic fluid with deionized water, so that the magnetic carrier can be integrated into it during the molecular sieve synthesis process;

[0040] 3. Alkali-soluble roasting

[0041] Add sodium hydrox...

Embodiment 3

[0049] 1. Pretreatment

[0050] The kaolin is crushed and ground and then magnetically separated, and the magnetically separated kaolin is passed through a 200-mesh sieve to obtain powder.

[0051] 2. Preparation of magnetic carrier

[0052] FeCl 2 and FeCl 3 Mix at a molar ratio of 1:2 and prepare a mixed solution with a total iron concentration of 0.5mol / L with deionized water. After stirring evenly, adjust the pH value to 10 with ammonia water with a mass concentration of 25%, and stir and react at 65°C for 2 hours. Then heat up to 90°C and let it stand for crystallization for 4 hours, and use a magnet to move the Fe 3 o 4 The crystals were separated and collected, washed with deionized water until neutral, and dried to obtain a magnetic carrier; the Fe 3 o 4 Prepare the magnetic fluid with deionized water, so that the magnetic carrier can be integrated into it during the molecular sieve synthesis process;

[0053] 3. Alkali-soluble roasting

[0054] Add sodium hydr...

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Abstract

The invention discloses a method for preparing a magnetic 4A molecular sieve by using the kaolin. The kaolin serves as main materials, aluminum hydroxide serves as a supplementary aluminum source, deionized water serves as a solvent, Fe3O4 serves as a magnetic carrier, and the magnetic 4A molecular sieve which is low in price, high in performance and recyclable is prepared by a hydrothermal synthesis method. According to the method, the preparation process is simple, materials are easy to obtain, and the operation is simple and convenient; and the synthesized 4A zeolite molecular sieve has the advantages of being high in crystallinity, fine in granularity and good in dispersibility and magnetic stability, a static water adsorption rate of an obtained adsorbent achieves 21.66%, the calcium ion exchange capacity achieves 303.45 mg CaCO3 / g, simultaneously a high removal rate for ammonia nitrogen and heavy metal pollutants is provided, and standards achieve those of the ministry of chemical industry.

Description

1. Technical field [0001] The invention relates to the recovery and reuse of solid waste, in particular to a method for preparing magnetic 4A molecular sieves from kaolin. 2. Background technology [0002] Zeolite molecular sieve is a porous inorganic aluminosilicate crystalline material, which has excellent ion exchange adsorption performance, thermal stability and catalytic performance. It is often used as catalyst material, adsorbent, ion exchanger and various new functional materials. It is widely used It is used in many fields such as daily chemical, petrochemical, fine chemical and environmental protection. However, at present, the preparation of zeolite molecular sieves exists in powder form, which is extremely inconvenient for industrial use; or it is prepared into aggregates with a certain shape and size, but the addition of binders in the preparation will reduce the performance of zeolite molecular sieves accordingly, so this is There are contradictory problems in...

Claims

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Application Information

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IPC IPC(8): C01B39/18B09B3/00
Inventor 彭书传鲍腾舒林岳正波谢晶晶闫瑾郑思灿杨哲刘海波张雄军
Owner HEFEI UNIV OF TECH
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