4A zeolite synthesized from kaolin by low-temperature alkali fusion method

A technology of kaolin and alkali fusion method, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of high cost and cumbersome process, and achieve low cost, simplified process flow and good dispersion Effect

Inactive Publication Date: 2008-11-19
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of abundant and easy-to-obtain kaolin for the deficiencies of high cost and cumbersome process in the existing chemical synthesis method, acidified bentonite method and kaolin high-temperature calcination method of producing 4A zeolite. Raw material, preparation method of synthetic 4A zeolite with simple production process

Method used

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  • 4A zeolite synthesized from kaolin by low-temperature alkali fusion method
  • 4A zeolite synthesized from kaolin by low-temperature alkali fusion method
  • 4A zeolite synthesized from kaolin by low-temperature alkali fusion method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 25.8g of kaolin and 24.0g of sodium hydroxide evenly, add 30ml of water to make the mixture thick, roast at 200°C for 2 hours, pour it into a flask after cooling, and heat for 1 hour, 20.4g of active aluminum oxide, 24g Active silicon dioxide is mixed evenly, and added evenly within 1 hour, and 162ml of water is added to stir and crystallize for 1 hour. Heating on a water bath at a constant temperature of 95°C for 3 hours, suction filtration, and then drying at 110°C for 2 hours to obtain 4A zeolite product. The product has been tested by "X-ray diffraction analysis", and the 4A zeolite content is above 96%, and its calcium exchange rate is about 310mg CaCO 3 / g, all physical and chemical indicators have reached or exceeded the national standard.

Embodiment 2

[0027] Mix 25.8g of kaolin and 25.6g of sodium hydroxide evenly, add 50ml of water to make the mixture thick, roast at 250°C for 2 hours, pour it into a flask after cooling, 20.4g of active aluminum oxide, 24g of active silicon dioxide Mix evenly, add evenly within 1 hour, add 162ml of water, stir and crystallize for 1 hour. Heating on a water bath at a constant temperature of 90°C for 4 hours, suction filtration, and drying at 105°C for 2 hours to obtain 4A zeolite product. The product has been tested by "X-ray diffraction analysis", and the 4A zeolite content is above 98%, and its calcium exchange rate is about 327mg CaCO 3 / g, all physical and chemical indicators have reached or exceeded the national standard.

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Abstract

This invention relates to a method for preparing 4A zeolite with kaoline as the raw material aiming at providing a preparation method for composite 4A zeolite with kaoline as the raw material against the shortcomings of the present chemosynthesis method, acidified bentonite method and a kaoline high temperature calcining method including the following steps: mixing uniformly kaolin and NaOH in a certain proportion and heating them for 1-3h, adding a certain volume of active Al2O3, active SiO2 and water in the activated product to be thermal-crystalized for 0.5-4h under 80-95deg.C then to filter the product and dry it to get the 4A zeolite product.

Description

technical field [0001] The invention relates to a method for preparing 4A zeolite, in particular to a method for synthesizing 4A zeolite with kaolin as raw material. Background technique [0002] The composition of 4A zeolite is Na 12 Al 12 Si 12 o 48 27H 2 O belongs to the cubic crystal system, and the free diameter of the hole formed by its eight-ring structure is Characterized by Ca 2+ 、H 2 O and other small molecular substances have strong adsorption and exchange capabilities, and are the best substitutes for sodium tripolyphosphate, which has serious pollution to water bodies. Detergents with 4A zeolite as auxiliary agent have no phosphorus, no pollution, no residue, and strong decontamination ability. They are widely used in the detergent industry. At the same time, they are also widely used in petroleum cracking and adsorbent industries. At present, there are three methods for producing 4A zeolite, chemical synthesis method, acidified bentonite method and kao...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B39/14
Inventor 李小忠陆国华韩伟琴陈爱贞
Owner ZHEJIANG NORMAL UNIVERSITY
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