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Method for synthesizing 4A zeolite from kaolin

A technology of kaolin and zeolite, which is applied in the field of synthesizing 4A zeolite from kaolin, can solve the problem of high energy consumption and achieve the effects of high energy consumption, good product quality and low cost

Inactive Publication Date: 2015-01-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method that can significantly reduce the synthesis cost of 4A zeolite, improve product quality, realize the utilization of different quality kaolin raw ores, overcome the shortcomings of high energy consumption in the traditional process, and contain mineral impurities such as quartz and mica in the product. A kind of method that kaolin synthesizes 4A zeolite

Method used

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  • Method for synthesizing 4A zeolite from kaolin
  • Method for synthesizing 4A zeolite from kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select 3g of kaolin, mix it with 16ml of 4mol / L sodium hydroxide solution and put it into the autoclave. The autoclave was kept at 240°C for 3h and then taken out. Then the activated kaolin was dissolved in 40ml of 3mol / L hydrochloric acid, stirred at 50°C for 0.5h and filtered to obtain the kaolin acid hydrolysate. Use NaOH to adjust the pH of the kaolin acid hydrolysis solution to 8 to obtain the active silicon-aluminum raw material, which is mixed with 40 mL of NaOH solution with a concentration of 0.67 mol / L and put into the autoclave. After the autoclave was kept at 90°C for 48 hours, it was washed and filtered to obtain 4A zeolite. Using the national light industry standard (QB / T1768-2003), the calcium ion exchange capacity is 334mg CaCO. 3 / g.

Embodiment 2

[0024] Choose 3g of kaolin, mix it with 16ml of 5mol / L sodium hydroxide solution and put it into the autoclave. The autoclave was kept at 160°C for 24 hours and then taken out. Then the activated kaolin was dissolved in 30ml of 4.8mol / L hydrochloric acid, stirred at 60°C for 1 hour, and filtered to obtain the kaolin acid hydrolysate. Using NaOH to adjust the pH of the kaolin acid hydrolysate to 9 to obtain the active silicon-aluminum raw material, which is mixed with 40 mL of NaOH solution with a concentration of 0.67 mol / L and placed in the autoclave. After the autoclave was kept at 90°C for 48 hours, it was washed and filtered to obtain 4A zeolite. Adopting the national light industry industry standard (QB / T1768-2003) method to measure its calcium ion exchange capacity is 320mg CaCO 3 / g.

Embodiment 3

[0026] Select 3g of kaolin, mix it with 16ml of 4mol / L sodium hydroxide solution and put it into the autoclave. The autoclave was kept at 190°C for 6h and then taken out. The activated kaolin was then dissolved in 100 ml of 1.2 mol / L hydrochloric acid, stirred at 70° C. for 2 hours, and filtered to obtain an acid hydrolysate of kaolin. Adjust the pH of the acid hydrolysis solution to 6 with NaOH to obtain a white flocculent precipitate. The precipitate was mixed with 1mol / L NaOH solution and put into the autoclave. After keeping the autoclave at 90°C for 96h, washing and filtering to obtain 4A zeolite. Adopting the national light industry standard (QB / T1768-2003) method, the calcium ion exchange capacity is 385mgCaCO 3 / g.

[0027] Comparative process: using the same kaolin as the above process, first calcining at 800°C for 4 hours in the traditional process, and using the same synthesis conditions as in Example 3. After the product is kept at 90°C for 96 hours, it is washed a...

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Abstract

The invention discloses a method for synthesizing 4A zeolite from kaolin, and relates to zeolite, and the method can be used for obviously reducing the synthesis cost of the 4A zeolite, improving the quality of the 4A zeolite, utilizing kaolin ores with different quality, and overcoming the defects of high energy consumption and impurity minerals, such as quartz and mica, contained in products of the conventional process. The method comprises the following steps of: firstly, mixing kaolin materials with alkali liquor, and filtering the mixture to separate out activated kaolin after reaction; secondly, dissolving the activated kaolin obtained in the first step in hydrochloric acid, and heating the solution for reaction; thirdly, filtering the solution obtained in the second step, thus obtaining a kaolin acid solution without solid impurity minerals; fourthly, adjusting the pH of the kaolin acid solution obtained in the third step to be 5-9 by use of NaOH, and filtering the solution to obtain flocculent activated silica alumina materials; and fifthly, mixing the activated silica alumina materials obtained in the fourth step with alkali liquor, performing hydro-thermal synthesis on the mixture, and washing, filtering and drying the reacted mixture to obtain the synthetic product 4A zeolite.

Description

Technical field [0001] The invention relates to a zeolite, in particular to a method for synthesizing 4A zeolite from kaolin. Background technique [0002] 4A zeolite is composed of 8 β cages (which are composed of eight six-membered rings and six four-membered rings) located at the corners of the cube and are interconnected by four-membered rings to form Alpha cage with pore size, which belongs to cubic zeolite molecular sieve, the framework density is Because 4A zeolite can remove calcium and magnesium hard ions in water by ion exchange, so as to replace sodium tripolyphosphate, which pollutes the environment, it can be widely used in non-phosphorus detergents. [0003] The synthesis method of 4A zeolite can be divided into chemical synthesis method and mineral synthesis method. The chemical synthesis method uses chemical reagents such as aluminosilicate for synthesis. The mineral synthesis method mainly uses activated kaolin (meta-kaolin) as the synthetic raw material to synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 宓锦校王景泉
Owner XIAMEN UNIV
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