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Method for preparing 13X type molecular sieve through coal ash

A technology of fly ash and molecular sieve, which is applied in chemical instruments and methods, other chemical processes, and eight-sided crystalline aluminum silicate zeolite, etc., to achieve the effects of low cost, saving of chemical raw materials, and wide source of raw materials

Inactive Publication Date: 2015-07-01
杨治平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, the utilization of fly ash is mainly concentrated in the production of fly ash sintered bricks, and the research on the recovery of iron and carbon from fly ash and the extraction of alumina and glass beads from fly ash has also been reported.

Method used

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  • Method for preparing 13X type molecular sieve through coal ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Keeping the basicity and stirring speed constant, the effect of crystallization temperature on the synthesis of zeolite was investigated.

[0019] According to the research of the inventors, the adsorption amount increases obviously when the temperature is lower than 100°C, and the adsorption amount tends to decrease when the temperature exceeds 100°C. The chromium ion adsorption capacity of crystallized zeolite at 60°C is relatively large, but it takes about 18h; the crystallization time can be shortened to 10h at 85°C, but the chromium ion adsorption capacity is slightly reduced; when crystallized at 120°C, only It takes 4.5h, but the chromium ion adsorption capacity is significantly lower than the value at 100°C.

[0020] The crystallization temperature should not be too low, otherwise the crystallization process will be too slow, the purity of the synthetic stone will be low, and the adsorption effect will be poor; it should not be too high, because the X-type zeoli...

Embodiment 2

[0023] Keeping the synthesis temperature at 100°C and keeping factors such as alkalinity and stirring speed constant, the effect of crystallization time on the synthesis of zeolite was investigated.

[0024] According to the research of the inventors, when the crystallization time is short, the crystallinity of the synthesized sample is not high or presents an amorphous state. This is because the process of synthesizing zeolite by hydrothermal method is divided into two stages, namely the formation of crystal nuclei (induction period) and the growth of crystal nuclei. When the crystallization time is short, the synthesis process is only in the induction period, and the crystal nucleus stops before it grows up. The zeolite molecular sieve is a metastable crystal. If the crystallization time is too long, the synthetic sample will be destroyed under alkaline conditions, resulting in a decrease in crystallinity or crystal transformation to form other crystals. Therefore, the cryst...

Embodiment 3

[0026] Keeping the synthesis temperature at 100°C, crystallization time (8h), stirring speed and other factors unchanged, the influence of alkali concentration on the synthesis of zeolite was investigated.

[0027] The zeolite synthesized with NaOH with concentrations of 1.4832, 0.9488, and 0.9477mol / L was made into three samples a, b, and c. When synthesizing, SiO2 / Al2O3=3 (molar ratio), crystallization temperature 100°C, H2O / Na2O =55 (molar ratio), crystallization time 8h.

[0028] According to the research results, the three samples all have the diffraction peaks of faujasite, and the basicity n of sample a: 1.4832 (mol / L) is obviously greater than that of sample b: 0.9488 (mol / L), so when alkali is dissolved, Low concentration of NaOH cannot synthesize high-quality faujasite, and high concentration of NaOH can synthesize higher purity faujasite. Experiments have determined that the appropriate alkalinity is 1.4-1.5 mol / L.

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Abstract

The invention relates to a method for preparing a 13X type molecular sieve through coal ash. The method consists of four steps including roasting, preparing, crystallizing and ageing. The method is characterized in that the grain diameter of the coal ash is 0.45mm or below; the crystallization temperature of the crystallizing process ranges from 80 DEG C to 100 DEG C, the crystallizing time is 6 hours to 10 hours, the concentration of NaO ranges from 1.4mol / L to 1.5mol / L, the stirring speed ranges from 120r / min to 150r / min, and the aging time is not less than 24 hours. According to the method, the coal ash serves as main raw material to prepare the 13X type molecular sieve, the coal ash and the value of the coal ash are utilized to the greatest extent; in the preparation process, no coal ash residue remains, chemical materials can be saved, and the prepared 13X type molecular sieve has the advantages of wide raw material source and low cost.

Description

technical field [0001] The invention relates to the utilization field of fly ash, in particular to a method for preparing 13X molecular sieve from fly ash. Background technique [0002] my country's coal-fired power plants basically use bituminous coal. With the development of my country's electric power industry, the total installed capacity continues to increase, and the discharge of fly ash is also increasing. So far, the annual ash discharge has exceeded 100 million tons. Based on concern for the environment, people put forward a major issue of how to maximize the use of fly ash. However, so far, the utilization of fly ash has been mainly concentrated in the production of fly ash sintered bricks, while the research on recovering iron and carbon from fly ash and extracting alumina and glass beads from fly ash has also been reported. This is mainly because only when the content of iron, carbon, aluminum oxide and glass microspheres in fly ash is high enough, there is rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/22B01J20/18B01J20/30
Inventor 杨治平
Owner 杨治平
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