Method for preparing 4A molecular sieve by adopting coal slime

A molecular sieve and coal slime technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve the effect of improving whiteness, 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

[0004] In recent years, some scholars have used coal series kaolin, coal gangue, and fly ash as silicon and aluminum sources to synthes

Method used

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  • Method for preparing 4A molecular sieve by adopting coal slime
  • Method for preparing 4A molecular sieve by adopting coal slime
  • Method for preparing 4A molecular sieve by adopting coal slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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 4A type molecular sieve by using coal slime comprises the following steps:

[0031] 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:

[0032] The main chemical composition (wt%) of table 1 coal slime ash

[0033]

[0034] 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; the...

Embodiment 2

[0050] 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 4A type molecular sieve by using coal slime comprises the following steps:

[0051] 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 4:

[0052] The main chemical composition (wt%) of table 4 coal slime ash

[0053]

[0054] 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...

Embodiment 3

[0065] 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 4A type molecular sieve by using coal slime comprises the following steps:

[0066] 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 6:

[0067] The main chemical composition (wt%) of table 6 coal slime ash

[0068]

[0069] 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; t...

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Abstract

The invention discloses a method for preparing a 4A molecular sieve by adopting coal slime. The method comprises the steps: 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 crystallizing to obtain a solid-liquid mixture; and 6, filtering the solid-liquid mixture to obtain a filter cake, washing the filter cake with deionized water, and drying to obtain the 4A 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 4A molecular sieve is reduced, land occupation and environmental pollution caused by accumulating massive 4A molecular sieve are avoided, and the prepared 4A 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 4A molecular sieves by using coal slime. Background technique [0002] 4A molecular sieve is an important inorganic microporous material, which has the characteristics of efficient selective adsorption, catalysis and ion exchange, and is widely used in daily chemicals, petrochemicals, medicine and environmental protection industries. Type 4A molecular sieves include natural zeolite molecular sieves and synthetic molecular sieves. The current industrial method for preparing 4A molecular sieves is to use pure chemicals such as sodium silicate, aluminum hydroxide, and sodium hydroxide as raw materials and prepare them by hydrothermal method. The method for synthesizing 4A molecular sieves with pure chemical reagents is mature, but its disadvantages are that it has strict requirements on the performance of the raw materials (the...

Claims

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Application Information

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IPC IPC(8): C01B39/14
CPCC01B39/14
Inventor 杜美利吴涛司玉成王水利李刚刘静杨建利樊锦文
Owner XIAN UNIV OF SCI & TECH
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