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Method for preparing magnetic 4A zeolite with kaolin and red mud as raw materials

A technology of kaolin and red mud, which is applied in the field of preparing magnetic 4A zeolite, can solve the problems of weak magnetic properties and many steps of magnetic zeolite, achieve the effect of reducing wastewater treatment process, facilitating large-scale industrial preparation, and realizing large-scale industrial preparation

Active Publication Date: 2020-05-19
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the above-mentioned magnetic zeolite preparation methods, the first two methods need to use iron salts to synthesize magnetic particles, and there are many steps, and a large amount of waste water will be generated when synthesizing magnetic materials; the third method introduces ferromagnetic materials (pyrite, red mud) to prepare Due to the limited magnetic properties of the magnetic zeolite, the magnetic properties of the obtained magnetic zeolite are weak and need to be further improved.

Method used

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  • Method for preparing magnetic 4A zeolite with kaolin and red mud as raw materials
  • Method for preparing magnetic 4A zeolite with kaolin and red mud as raw materials
  • Method for preparing magnetic 4A zeolite with kaolin and red mud as raw materials

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Embodiment approach 1

[0018] 2g of red mud and 20g of kaolin were mixed uniformly in a ball mill for 30min according to the mass ratio of 1:10; then they were calcined at 650°C for 1h under a nitrogen atmosphere, and then reduced by hydrogen for 1h; 2.2g of the reduced red mud and kaolin mixture, 0.36 Mix 1 g of sodium hydroxide and 20 g of water in a mass ratio of 6:1:50, stir evenly to form a gel-like mixture, then transfer it to a reaction kettle, heat and crystallize at 90°C, cool, wash with water, and dry to obtain the magnetic 4A zeolite.

[0019] The XRD spectrum, SEM photos and magnetic separation photos of the magnetic 4A zeolite prepared in this embodiment are as follows: figure 1 , 2 and 3. It can be seen that the obtained zeolite is A-type zeolite with high crystallinity, and its shape is the cubic shape of 4A zeolite. It has good magnetic properties and can realize rapid separation under an external magnetic field.

Embodiment approach 2

[0021] 2.5g of red mud and 20g of kaolin were mixed uniformly in a ball mill for 45 minutes according to the mass ratio of 1:8; then calcined at 600°C for 2 hours under a nitrogen atmosphere, and then reduced by hydrogen for 1.5 hours; 2.2g of the reduced red mud and kaolin mixture , 0.55g sodium hydroxide and 20g water were mixed according to the mass ratio of 6:1.5:50, stirred evenly to form a gel-like mixture, then transferred to a reaction kettle, heated to crystallize at 100°C, cooled, washed with water, and dried to obtain magnetic 4A Zeolite.

Embodiment approach 3

[0023] 5g of red mud and 20g of kaolin were mixed uniformly in a ball mill for 50 minutes according to the mass ratio of 1:4; then they were calcined at 700°C for 3 hours under a nitrogen atmosphere, and then reduced by hydrogen for 2 hours; 2.2g of the reduced red mud and kaolin mixture, 0.44 Mix g sodium hydroxide and 20 g water according to the mass ratio of 6:1.2:50, stir evenly to form a gel-like mixture, then transfer it to a reaction kettle, heat and crystallize at 80°C, cool, wash with water, and dry to obtain magnetic 4A zeolite.

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Abstract

The invention relates to the technical field of zeolite preparation, and discloses a method for preparing magnetic 4A zeolite with kaolin and red mud as raw materials. The method comprises the following steps: S1, grinding the red mud and the kaolin in a ball mill according to a mass ratio of 1: (2-10) for 30-60 minutes to form a uniform mixture; S2, calcining the mixture of the kaolin and the redmud for 2-3 hours at a high temperature of 600-700 DEG C in a nitrogen atmosphere, and then introducing hydrogen for reduction for 1-2 hours; S3, mixing the red mud-kaolin mixture obtained in S2, sodium hydroxide and water according to a mass ratio of 6: (1-1.5): 50, and carrying out uniform stirring to obtain a gel colloid; and S4, transferring the gelatinous mixture into a reaction kettle, conducting heating and crystallizing at 80-100 DEG C, and successively carrying out cooling, washing with water, and drying to obtain the magnetic 4A zeolite. Compared with the prior art, the kaolin and the red mud are used as raw materials, and subjected to calcination activation, reduction, alkali liquor addition and hydrothermal treatment to prepare the magnetic 4A zeolite, so low-cost green preparation of the magnetic 4A zeolite is achieved, preparation of magnetic particles is avoided, subsequent treatment procedures are reduced, and the method is economical and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of zeolite preparation, in particular to a method for preparing magnetic 4A zeolite by using kaolin and red mud as raw materials. Background technique [0002] 4A zeolite is a zeolite molecular sieve with excellent adsorption properties, which is widely used in detergent aids, desiccants, adsorbents and other products. In order to reduce costs, many clay minerals are used to synthesize 4A zeolite. At present, commercial 4A zeolite is mostly prepared from bauxite or waste aluminum slag from aluminum factories. Kaolin is a non-metallic clay mineral containing silicon and aluminum. Its theoretical composition is similar to that of 4A zeolite. It is an ideal raw material for preparing 4A zeolite. After calcination and activation of kaolin, it can be obtained by hydrothermal crystallization by adding NaOH solution. [0003] The synthesized 4A zeolite has a small particle size, and there are still separation prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/18C01G49/08
CPCC01B39/18C01G49/08C01P2002/72C01P2004/03C01P2004/80C01P2006/42
Inventor 朱朝蒋文彬裘倩倩蔡韡郑恒刘木子蒋金龙吴妹谷亚昕
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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