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Activated carbon-molecular sieve prepared from cow dung and coal fly ash and its preparation method and application

A technology of activated carbon and molecular sieve, applied in chemical instruments and methods, other chemical processes, crystalline aluminosilicate zeolites, etc., can solve problems such as low carbon content, low residual carbon content, volatile matter, and low volatile matter

Active Publication Date: 2022-04-05
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low carbon content and extremely low volatile content of coal fly ash, the specific surface area of ​​the prepared composites is often low, which limits its further utilization and development.
Usually, the process of preparing activated carbon-molecular sieve composite materials from coal fly ash is to first mix the coal fly ash with NaOH and carry out high-temperature melting to activate the carbon and melt the silicon-alumina in the ash. After the mixture is pulverized, silicon source is added. Or the aluminum source controls the ratio of silicon to aluminum, and then aging in distilled water. The aged mixture is subjected to hydrothermal treatment, filtered and washed to neutral to obtain activated carbon-molecular sieve composite materials. Due to the low residual carbon content and volatile matter of coal fly ash , resulting in the prepared composite materials often have a lower specific surface area, which reduces the utilization value of composite materials

Method used

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  • Activated carbon-molecular sieve prepared from cow dung and coal fly ash and its preparation method and application
  • Activated carbon-molecular sieve prepared from cow dung and coal fly ash and its preparation method and application
  • Activated carbon-molecular sieve prepared from cow dung and coal fly ash and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Recipe: (weight)

[0040] 80% coal fly ash, 20% cow dung on a dry basis, the coal fly ash is Texaco gasification fly ash. Coal fly ash component is identical with comparative example 1;

[0041] Preparation:

[0042] (1) Mix coal fly ash, cow dung and NaOH, then activate at 750°C under nitrogen for 2 hours;

[0043] The mass ratio of the total mass of coal fly ash and cow dung to NaOH is:

[0044] Coal fly ash and dry cow dung: NaOH=1:1;

[0045] (2) The product of step (1) will be mixed with water, hydrothermally treated at 100° C. for 16 hours, and then the activated carbon-molecular sieve prepared from the cow dung and coal fly ash is collected from the system.

[0046] Then carry out water washing, suction filtration, drying, crushing and sieving to obtain a kind of activated carbon-molecular sieve with coal fly ash as raw material, which is a microporous powder with a particle size of 100-180 μm;

[0047] Adopt XRF method to analyze and detect, in the product,...

Embodiment 2

[0054] Coal fly ash 60%, dry basis cow dung 40%, described coal fly ash selects GSP gasification fly ash, and coal fly ash component is as follows: (weight)

[0055]

[0056] Other impurities 4.3; and S, O 2.7% in residual carbon;

[0057] Preparation:

[0058] (1) Mix coal fly ash, cow dung and NaOH, and then activate it at 800°C for 2 hours under nitrogen;

[0059] The mass ratio of the total mass of coal fly ash and cow dung to NaOH is:

[0060] Coal fly ash and dry cow dung: NaOH=1:1;

[0061] (2) The product of step (1) will be mixed with water, hydrothermally treated at 80° C. for 8 hours, and then the activated carbon-molecular sieve prepared from the cow dung and coal fly ash is collected from the system.

[0062] Then carry out water washing, suction filtration, drying, crushing and sieving to obtain a kind of activated carbon-molecular sieve with coal fly ash as raw material, which is a microporous powder with a particle size of 100-180 μm;

[0063] Adopt XRF me...

Embodiment 3

[0070] 40% of coal fly ash, 60% of cow dung on a dry basis. The coal fly ash is selected from Texaco gasification fly ash, and its components are the same as in Example 1.

[0071] Preparation method is identical with embodiment 2:

[0072] Adopt XRF method to analyze and detect, in the product, the percentage of each component is:

[0073]

[0074]

[0075] The specific surface area is 600m 2 / g; Ni 2+ The adsorption amount was 4.5 mmol / g.

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Abstract

The invention discloses an activated carbon-molecular sieve prepared from cow dung and coal fly ash and its preparation method and application. The activated carbon-molecular sieve prepared from cow dung and coal fly ash comprises two components of activated carbon and molecular sieve, and is a microporous powder , the particle size is 100-180μm, and the specific surface area is 400-600m 2 / g. The activated carbon-molecular sieve prepared by the cow dung and coal fly ash can be used for the adsorption of heavy metal ions in waste water. In the present invention, cow dung and coal fly ash are jointly used as raw materials for preparing carbon-molecular sieves to realize high-value resource utilization of the two, and the specific surface area can reach 600m 2 / g or more, which is 2.6 to 5.0 times that of activated carbon-molecular sieve prepared directly from coal fly ash. Used for the adsorption of heavy metal ions in wastewater, the adsorption capacity can reach more than 4.5mmol / g, which is 2.2 to 3.2 times that of activated carbon-molecular sieve prepared without adding cow dung.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing cow dung waste and coal fly ash. Background technique [0002] Coal fly ash is a low-value waste produced during the industrial utilization of coal, especially during the coal gasification process. Coal chemical companies produce a large amount of unusable low-value coal fly ash every year, and these coal fly ash are often buried treatment, resulting in a serious waste of resources and environmental pollution. Therefore, how to use coal fly ash is of great significance for solving the resource utilization of solid waste in coal chemical enterprises, reducing its treatment cost and environmental pollution. It is an effective method to directly prepare molecular sieve-activated carbon composites from coal fly ash. This process does not require the separation of silicon-alumina and residual carbon, and can make full use of the advantages of both, that is, the high specific surface of activat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C01B39/02B01J20/18B01J20/20C02F1/28C02F1/62
CPCC01B32/324C01B32/348C01B39/02B01J20/20B01J20/18C02F1/281C02F1/62
Inventor 王焦飞白永辉宋旭东苏暐光于广锁
Owner NINGXIA UNIVERSITY