Method for preparing 13X molecular sieve by adopting coal slime

Abstract

The invention discloses a method for preparing a 13X molecular sieve by adopting coal slime. The method comprises the steps of 1, grinding and sieving the coal slime, and calcining the sieved matter to obtain coal slime ash; 2, mixing a hydrochloric acid solution with the coal slime ash, reacting while stirring, filtering to obtain filter residue, and drying the filter residue for later use; 3, mixing NaOH with the dried filter residue, and performing alkali fusion to obtain slag; 4, adding sodium metaaluminate and water into the slag, and stirring uniformly to obtain a mixture; 5, ageing the mixture and then crystallizing to obtain a solid-liquid mixture; and 6, filtering the solid-liquid mixture in vacuum to obtain a filter cake, washing the filter cake with deionized water, and drying to obtain the 13X molecular sieve. By adopting the method, the coal slime can be sufficiently utilized, the utilization rate and the additional value of the coal slime are greatly improved, the preparation cost of the 13X molecular sieve is reduced, land occupation and environmental pollution caused by accumulating massive 13X molecular sieve are avoided, and the prepared 13X molecular sieve product has uniform granularity distribution and stable quality.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and in particular relates to a method for preparing 13X molecular sieves by using coal slime. Background technique [0002] 13X molecular sieve is a kind of microporous material with excellent ion exchange, catalysis and adsorption properties. It has a wide range of uses and great application prospects in many fields such as fine chemical industry, petrochemical industry, medicine and health, and environmental protection. At present, X-type molecular sieves are mainly made of caustic soda, aluminum hydroxide, water glass, etc., and are produced by a low-temperature hydrothermal synthesis process. However, since the source of raw materials is pure chemical reagents from silicon and aluminum sources, the synthesis cost is high and does not have economic benefits. Difficult to scale production. The use of natural aluminosilicate mineral raw materials such as kaolin, perlite, pum...

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Problems solved by technology

[0005] In recent years, some scholars have synthesized some types of molecular sieves using coal series kaolin, coal gangue, and fly ash as silicon and aluminum sources, but there is no report on the preparation of 13X type molecular sieves using coal slime as raw materials.

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