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Method for reducing granularity of kaolin fine powder

A technology of kaolin and fine powder, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve problems such as reducing crystallinity

Active Publication Date: 2021-06-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reason is that kaolin clay is first molded to obtain kaolin microspheres, most of its pores are wrapped in the bulk phase, and molecular sieves cannot enter the pores during the synthesis process. , thus reducing its crystallinity

Method used

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  • Method for reducing granularity of kaolin fine powder
  • Method for reducing granularity of kaolin fine powder
  • Method for reducing granularity of kaolin fine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0040] Preparation of hexamethylphosphoric triamide solution: use hexamethylphosphoric triamide as raw material, dilute it with deionized water, prepare an aqueous solution of hexamethylphosphoric triamide, and its mass fraction is 0.1-10% .

[0041] Hexamethylphosphoric triamide solution 1:

[0042] Using hexamethylphosphoric triamide as a raw material, dilute it with deionized water to prepare an aqueous solution of hexamethylphosphoric triamide, the mass fraction of which is 0.1%.

[0043] Hexamethylphosphoric triamide solution 2:

[0044] Using hexamethylphosphoric triamide as a raw material, dilute it with deionized water to prepare an aqueous solution of hexamethylphosphoric triamide, the mass fraction of which is 0.5%.

[0045] Hexamethylphosphoric triamide solution 3:

[0046] Using hexamethylphosphoric triamide as a raw material, dilute it with deionized water to prepare an aqueous solution of hexamethylphosphoric triamide, the mass fraction of which is 1%.

[004...

Embodiment 1

[0054] (1) Hexamethylphosphoric triamide solution 1.

[0055] (2) Dissolve kaolin in an aqueous solution of hexamethylphosphoric triamide, the mass ratio of the two is 1:2, and stir for 2 hours at 20°C. After filtering, washing and drying, intercalated kaolin J-1 was obtained.

Embodiment 2

[0057] (1) Hexamethylphosphoric triamide solution 2.

[0058] (2) Dissolve kaolin in an aqueous solution of hexamethylphosphoric triamide, the mass ratio of the two is 1:5, and stir for 4 hours at 30°C. After filtering, washing and drying, intercalated kaolin J-2 was obtained.

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Abstract

The invention relates to a method for reducing the granularity of kaolin fine powder by inserting an aqueous solution of hexamethylphosphoric triamide between kaolin layers. The method is realized by the following steps of: diluting hexamethylphosphoric triamide serving as a raw material with deionized water to prepare an aqueous solution of hexamethylphosphoric triamide with the mass fraction of 0.1-10%; intercalation of kaolin, in which the kaolin is dissolved in an aqueous solution of hexamethylphosphoric triamide, the mass ratio of the kaolin to the aqueous solution of hexamethylphosphoric triamide is 1: (2-10), and stirring is conducted for 2-4 h at the temperature of 20-70 DEG C; and filtering, washing and drying to obtain the intercalated kaolin. According to the preparation method disclosed by the invention, the low-concentration aqueous solution of hexamethylphosphoric triamide is adopted as the kaolin intercalator, so that the intercalation rate is high, the stripping effect is good, and the cost of the kaolin intercalator is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for reducing the particle size of kaolin fine powder, which is used for preparing in-situ synthesis catalysts. Background technique [0002] Kaolin contains silicon and aluminum sources. After high-temperature calcination or under acid / alkaline conditions, the active silica and alumina in kaolin dissolve and can be used as raw materials for synthesizing molecular sieves. The synthesis of molecular sieves by kaolin in-situ crystallization has several characteristics: (1) molecular sieves and kaolin matrix are bonded by chemical bonds, and the synthesized products contain both molecular sieve active components and carriers; (2) the carrier has a large heat capacity and a stable structure. Under high temperature conditions, the structure is not easy to collapse, so that the life of the catalyst can be greatly extended; (3) the activated kaolin has a rich pore structure; (4)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44
CPCC01B33/44C01P2004/03C01P2004/64
Inventor 刘洪涛胡清勋刘宏海孙雪芹刘涛赵晓争王久江赵红娟张莉熊晓云
Owner PETROCHINA CO LTD
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