Method for preparing 13X molecular sieve by adopting coal slime

A molecular sieve and coal slime technology, which is applied in the directions of favhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve the effect of improving reaction activity, reducing content and being easy to achieve

Inactive Publication Date: 2015-04-29
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Method for preparing 13X molecular sieve by adopting coal slime
  • Method for preparing 13X molecular sieve by adopting coal slime
  • Method for preparing 13X molecular sieve by adopting coal slime

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Experimental program
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Effect test

Embodiment 1

[0038] The coal slime used in this embodiment is the coal slime produced in the coal washing process of Huangling No. 1 Mine, and the method for preparing 13X type molecular sieve by using coal slime comprises the following steps:

[0039] Step 1. Calcination and activation: Grind the coal slime and pass it through a 200-mesh sieve, then place the sieved undersize in an ash dish and spread it evenly, calcinate at 800°C for 2.5 hours, and cool naturally to obtain coal slime ash; after testing, The chemical composition of described coal slime ash is shown in Table 1:

[0040] The main chemical composition (wt%) of table 1 coal slime ash

[0041]

[0042] Step 2, acid leaching to remove impurities: mix 30mL of hydrochloric acid solution with a concentration of 6mol / L and 10.00g of the coal slime ash described in step 1, stir and react at 95°C for 4.5h, after the reaction is completed, filter while hot to obtain The filter residue, the filter residue is dried for later use; th...

Embodiment 2

[0062] The coal slime used in this embodiment is the coal slime produced in the coal washing and processing process of Yan'an Checun Coal Mine. The method for preparing 13X molecular sieves from the coal slime comprises the following steps:

[0063] Step 1. Calcination and activation: Grind the coal slime and pass it through a 200-mesh sieve, then place the sieved undersize in an ash dish and spread it evenly, calcinate at 700°C for 3 hours, and cool naturally to obtain coal slime ash; after testing, the The chemical composition of the coal slime ash is shown in Table 5:

[0064] The main chemical composition (wt%) of table 5 coal slime ash

[0065]

[0066] Step 2. Acid leaching to remove impurities: Mix 80 mL of hydrochloric acid solution with a concentration of 5 mol / L and 10.00 g of the coal slime ash described in Step 1, and stir and react at 90°C for 5 hours. After the reaction is completed, filter while hot to obtain a filter residue , the filter residue is dried fo...

Embodiment 3

[0084] The coal slime used in this embodiment is the coal slime produced in the coal washing and processing process of Huangling No. 2 Mine, and the method for preparing 13X type molecular sieve by using coal slime comprises the following steps:

[0085] Step 1. Calcination and activation: Grind the coal slime and pass it through a 200-mesh sieve, then place the sieved undersize in an ash dish and spread it evenly, calcinate at 750°C for 2 hours, and cool naturally to obtain coal slime ash; after testing, the The chemical composition of coal slime ash is shown in Table 9:

[0086] The main chemical composition (wt%) of table 9 coal slime ash

[0087]

[0088] Step 2, acid leaching to remove impurities: mix 70mL of hydrochloric acid solution with a concentration of 5.5mol / L and 10.00g of coal mud ash described in step 1, stir and react at 110°C for 3h, after the reaction is completed, filter while hot to obtain The filter residue, the filter residue is dried for later use; th...

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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...

Claims

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Application Information

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IPC IPC(8): C01B39/22
Inventor 杜美利吴涛司玉成王水利杨建利刘静李刚李莹
Owner XIAN UNIV OF SCI & TECH
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