Method for preparing spherical molecular sieve

Abstract

The invention relates to a method for preparing a spherical molecular sieve. The method comprises the steps: (1) preparation of small-particle nuclei: adding a molecular sieve fine powder raw material and water to a stirring granulator, and performing stirring and granulation so as to obtain the small-particle nuclei with a particle diameter of 0.5-2.0 mm; (2) preparation of molecular sieve spherical particles: adding the small-particle nuclei, the molecular sieve fine powder raw material and water to a coating granulator so as to form the molecular sieve spherical particles; and (3) preparation of the finished product: performing sieving, drying and calcination on the molecular sieve spherical particles so as to obtain the spherical molecular sieve product. Compared with the prior art, the method has the advantages of a high pelletization rate of nuclei, energy saving, environmental protection and a simple preparation process, and the molecular sieve particles are compact, and has a rounded appearance and smooth appearance.

Description

technical field [0001] The invention relates to a production method of a spherical molecular sieve, in particular to a preparation method of a spherical molecular sieve. Background technique [0002] Traditional molecular sieve granulation mostly uses granulation equipment such as drums, discs, and sugar coating machines. Disc and sugar-coating machine granulation is mostly produced by batch method, which has low production efficiency, high labor intensity, high labor cost, and large dust pollution; although drum granulation has significantly improved the production capacity of a single machine, it takes a long time to granulate and is not easy The formation of nuclei leads to an increase in the return rate, low production efficiency, and high energy consumption. [0003] Chinese patent CN101357311A discloses a molecular sieve pelletizing machine, which includes a power transmission part and a cylinder part connected to the cylinder part, and is characterized in that it als...

AI Technical Summary

Problems solved by technology

This method has high ball forming efficiency, low noise, is not easy to block materials, and can remove sticky materials on the inner wall at any time; the biggest disadvantage is that it is not easy to produce small nuclei, which leads to low production efficiency of the equipment, and is easy to cause the entire granulation and material return System traffic fluctuations

[0004] Chinese patent CN10617948ZA discloses a method for preparing a fluidizable molecular sieve based on vibration embedding granulation. The method is to mix the molecular sieve catalyst with a carrier, a binder and water to make a slurry and fully stir the prepared slurry. In the case of feeding while vibrating, spray granulation is used for granulation; the prepared particles are sprayed into the matrix, the particles in the matrix are separated and dried, which is suitable for granulation of small particle size molecular sieves, but This method has a large drying load and high production costs

In addition to the stirring granulator, it can also use other granulation equipment for the production of small particles. The amount of granulation water replenishment is 2% to 5%. The production of compound fertilizer cannot be applied to the granulation production of materials such as molecular sieves

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