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Method for preparing 4A zeolite molecular sieve with illite-containing kaolin

A technology of zeolite molecular sieve and kaolin, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of large difference in activation temperature, difficulty in preparing 4A molecular sieve, loss of activity, etc., and achieve product granularity The effect of uniform distribution, reduced influence, and relaxed operating conditions

Inactive Publication Date: 2012-12-05
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both illite and kaolinite are clay minerals with a layered structure. They are difficult to separate and have a large difference in activation temperature. The activation temperature of illite is above 850°C, and the metakaolin formed by kaolin loses its activity in this temperature range. And it is easy to form mullite. Under the technical conditions of existing research and patents, it is difficult to activate the kaolinite and illite in the mineral under low temperature conditions, which makes it difficult for kaolin containing illite to be used in the preparation of 4A molecular sieves.

Method used

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  • Method for preparing 4A zeolite molecular sieve with illite-containing kaolin
  • Method for preparing 4A zeolite molecular sieve with illite-containing kaolin
  • Method for preparing 4A zeolite molecular sieve with illite-containing kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The kaolin containing illite prepares the method for 4A zeolite molecular sieve, it may further comprise the steps:

[0029] (1) Using illite-containing kaolin as raw material, according to the mass ratio of kaolin and NaOH of 1:2, mix the two evenly, put them in a high-temperature furnace, calcined at 300°C for 2 hours, cool, grind and pulverize to obtain alkali-fired kaolin;

[0030] (2) Weigh 20g of alkali-burned kaolin, add it to 100ml of water, and stir vigorously in a water bath at 60°C for 2 hours to obtain a gelled product; then heat the gelled product to 90°C and stir at a low speed for 2 hours to obtain a crystallized product;

[0031] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.

[0032] The calcium ion exchange capacity of the 4A molecular sieve prepared in this example is 311mgCaCO 3 / g - dry basis. Depend on figure 2 It can be seen that the synthetic product is a 4A zeolite molecular sieve with good crystallization ...

Embodiment 2

[0034] The kaolin containing illite prepares the method for 4A zeolite molecular sieve, it may further comprise the steps:

[0035] (1) Using illite-containing kaolin as raw material, according to the mass ratio of kaolin and NaOH of 1:2, mix the two evenly, put them in a high-temperature furnace, calcined at 400°C for 2 hours, cool, crush and grind to obtain alkali-fired kaolin;

[0036] (2) Weigh 20g of alkali-burned kaolin, add it to 100ml of water, and stir vigorously in a water bath at 60°C for 2 hours to obtain a gelled product; then heat the gelled product to 90°C and stir at a low speed for 2 hours to obtain a crystallized product;

[0037] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.

[0038] The calcium ion exchange capacity of the 4A zeolite molecular sieve prepared in this example is 314mgCaCO 3 / g - dry basis.

Embodiment 3

[0040] The kaolin containing illite prepares the method for 4A zeolite molecular sieve, it comprises the following steps:

[0041] (1) Using illite-containing kaolin as raw material, according to the mass ratio of kaolin and NaOH of 1:2, mix the two evenly, put them in a high-temperature furnace, calcined at 300°C for 2 hours, cool, crush and grind to obtain alkali-fired kaolin;

[0042] (2) Weigh 20g of alkali-burned kaolin, add it to 100ml of water, and stir vigorously in a water bath at 50°C for 3 hours to obtain a gelled product; then raise the temperature of the gelled product to 70°C and stir at a low speed for 3 hours to obtain a crystallized product;

[0043] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.

[0044] The calcium ion exchange capacity of the 4A zeolite molecular sieve prepared in this example is 299mgCaCO 3 / g - dry basis.

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Abstract

The invention relates to a method for preparing a 4A zeolite molecular sieve with illite-containing kaolin. The method comprises the following steps of: (1) calcining illite-containing kaolin and NaOH particles together at the temperature of 250-400 DEG C for 2 hours, activating, cooling, grinding and smashing to obtain alkali-calcined kaolin; (2) mixing the alkali-calcined kaolin with a certain amount of distilled water, stirring at the temperature of 60 DEG C for 2-4 hours to obtain a gelatination product, and stirring the gelatination product at the temperature of 90 DEG C for 2-4 hours to obtain a crystallization product; and (3) leaching the crystallization product, washing and drying to obtain the 4A zeolite molecular sieve. The illite-containing kaolin is taken as a raw material, so that the adverse effect on a synthetic molecular sieve caused by incapability of activating illite serving as a difficultly-separable mineral in kaolin ore during low-temperature calcining is reduced effectively, the calcining temperature is low, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a method for preparing 4A zeolite molecular sieve from illite-containing kaolin. Background technique [0002] The composition of 4A zeolite is Na 12 al 12 Si 12 o 48 ?27H 2 O, belonging to the cubic crystal system, the free diameter of the hole formed by its eight-membered ring structure is 4.12? 2+ 、H 2 O and other small molecular substances have strong adsorption and exchange capabilities. Detergents with 4A zeolite as additives have the characteristics of no phosphorus, no pollution, no residue, and strong decontamination ability. They are the best substitutes for sodium tripolyphosphate, which has serious pollution to water bodies, and are also widely used in Petroleum cracking and adsorbent industries. [0003] Kaolin is a natural aluminum-containing silicate non-metallic mineral, and the ideal chemical formula of its main mineral kaolinite is Al 2 o...

Claims

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Application Information

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IPC IPC(8): C01B39/18
Inventor 马玉南严春杰仇秀梅王洪权周春宇孙奇朱鹏陈颂文
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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