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
CN112897543AActive Publication Date: 2021-06-04PETROCHINA CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2021-06-04

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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.
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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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