Preparation method of 3A molecular sieve

Abstract

The invention provides a preparation method of a 3A molecular sieve. The preparation method includes the steps of primary exchange and secondary exchange. Primary exchange includes the following steps that a 4A molecular sieve and potassium-containing washing water recycled through secondary exchange are mixed and stirred in a primary exchange tank for exchange, filter-press washing is carried out after exchange is completed, and a primary filter-press material is obtained. Secondary exchange includes the following steps that the primary filter-press material, water and potassium chloride are mixed and stirred in a secondary exchange tank for exchange, press-filter washing is carried out after exchange is completed, and a secondary press-filter material and potassium-containing washing water are obtained, the potassium-containing washing water is recycled into primary exchange to participate in exchange, and after the secondary press-filter material is subjected to press-filter washing with water, the 3A molecular sieve is prepared through drying.

Description

technical field [0001] The invention relates to a preparation method of 3A molecular sieve. Background technique [0002] Chinese patent document CN102351213A discloses a method for preparing 3A-type zeolite molecular sieves, which includes the following steps: 1) Calcination of kaolin: Calcining soft kaolin in Lincang, Yunnan Province at 550-700° C. for 3-5 hours to obtain metakaolin; 2. ), the preparation of 4A molecular sieve: according to the proportioning of metakaolin and NaOH aqueous solution: 1530g: 100mL, select metakaolin and NaOH aqueous solution, wherein, the concentration of NaOH aqueous solution is 2-5mol / L; Metakaolin and NaOH aqueous solution are mixed uniformly , raise the temperature to 60-80°C, age under strong stirring for 3-5 hours, then raise the temperature to 90-100°C, and stir at a medium speed for 4-6 hours to obtain the mixture; filter the mixture, wash the filter cake with distilled water and filter again , filter the obtained filter cake again a...

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Problems solved by technology

[0002] Chinese patent document CN102351213A discloses a method for preparing 3A-type zeolite molecular sieves, which includes the following steps: 1) Calcination of kaolin: Calcining soft kaolin in Lincang, Yunnan Province at 550-700° C. for 3-5 hours to obtain metakaolin; 2. ), the preparation of 4A molecular sieve: according to the proportioning of metakaolin and NaOH aqueous solution: 1530g: 100mL, select metakaolin and NaOH aqueous solution, wherein, the concentration of NaOH aqueous solution is 2-5mol/L; Metakaolin and NaOH aqueous solution are mixed uniformly , raise the temperature to 60-80°C, age under strong stirring for 3-5 hours, then raise the temperature to 90-100°C, and stir at a medium speed for 4-6 hours to obtain the mixture; filter the mixture, wash the filter cake with distilled water and filter again , filter the obtained filter cake again and dry at 90-100°C for 2-4 hours to obtain 4A molecular sieve; 3), the preparation of 3A type zeolite molecular sieve: according to the ratio of 4A molecular sieve and KCl solution: 5-10g: 100mL, select 4A Molecular sieve and

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