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A kind of mud-based spherical activated carbon and its preparation method and application

An activated carbon and spherical technology, applied in the field of activated carbon preparation, can solve the problems of high apparent density of mud-based activated carbon and increase the preparation cost, and achieve the effects of low apparent density, improved utilization rate and good sphericity

Active Publication Date: 2016-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the residual amount of inorganic substances in sludge is much higher than that of commercially available activated carbon raw materials such as coal, the apparent density of mud-based activated carbon is relatively large.
In order to reduce the apparent density of the product, it is usually necessary to separate the sand and stone in the sludge, but this will increase the cost of preparation

Method used

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  • A kind of mud-based spherical activated carbon and its preparation method and application
  • A kind of mud-based spherical activated carbon and its preparation method and application
  • A kind of mud-based spherical activated carbon and its preparation method and application

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preparation example Construction

[0039] The preparation method of mud-based spherical activated carbon of the present invention, process flow chart is as follows figure 1 As shown, the method can be divided into three stages of pretreatment-thermal conversion-aftertreatment, specifically including the following steps:

[0040] (preprocessing stage):

[0041] (1) Mix the sludge and the activator evenly in proportion, leave it to stand overnight and impregnate to obtain a slurry;

[0042] (2) mixing the slurry obtained in step (1) with cotton balls, so that the slurry is wrapped on the surface of the cotton balls to obtain the active carbon matrix;

[0043] (thermal conversion stage):

[0044] (3) Place the obtained activated carbon precursor in an oxygen-free heating furnace for pre-drying, then programmatically raise the temperature to the pyrolysis temperature and maintain the pyrolysis time, so that the activated carbon precursor completes the carbonization and activation process, and naturally cools to r...

Embodiment 1

[0048] Example 1: High-performance mud-based spherical activated carbon was prepared using municipal sludge from Liede Sewage Treatment Plant in Guangzhou.

[0049]The sludge was taken from the dehydration centrifuge of Guangzhou Liede Sewage Treatment Plant. The industrial analysis results of the sludge were expressed in mass fractions: water content was 78.4%, ash content was 55.9%, volatile content was 38.2%, and fixed carbon content was 5.9%. Sludge is directly used as raw material for the preparation of mud-based spherical activated carbon.

[0050] The preparation method of mud-based spherical activated carbon is as described above, and the specific operations are:

[0051] Take a portion of sludge with a 500mL beaker, put it in a balance and weigh 21.1g, then add ZnCl 2 Mix 13.7g powder with sludge evenly, impregnate ZnCl 2 The sludge was left to stand overnight to obtain a slurry; in the obtained slurry, about 150 cotton balls with an average particle diameter of 3mm...

Embodiment 2

[0056] Example 2: High-performance mud-based spherical activated carbon was prepared from municipal sludge of Datansha Sewage Treatment Plant in Guangzhou.

[0057] The sludge sample was changed to the sludge in the centrifugal filter press of Guangzhou Datansha Sewage Treatment Plant. The industrial analysis results of the sludge were expressed in terms of mass fraction: water content was 88.6%, ash content was 36.3%, volatile content was 54.8%, fixed Carbon 8.9%.

[0058] The specific operation of the preparation method of the mud-based spherical activated carbon is as follows: keep the ratio of the dry weight in the sludge to the mass of the activator at 1:3, take 24.8g of sludge in this embodiment, mix and add 8.48g of ZnCl 2 powder. The same steps and reaction conditions as in Example 1 were used to prepare high-performance mud-based spherical activated carbon.

[0059] The obtained product adopts the method identical with embodiment 1 to carry out specific surface area...

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Abstract

The invention belongs to the field of preparation of active carbon, and discloses a mud-based spherical active carbon as well as a preparation method and an application thereof. The method comprises the following steps: mixing and impregnating mud and an activator to make slurry, mixing the slurry with cotton balls to wrap the cotton balls with the slurry to obtain active carbon matrixes, then pyrolyzing the obtained active carbon matrixes, acid washing, water washing and finally drying pyrolysis products to obtain the mud-based spherical active carbon. The inner layer of the mud-based spherical active carbon obtained according to the preparation method is loose fiber substances, and the outer layer is compact porous medium; and the mud-based spherical active carbon has higher specific surface area, lower apparent density and excellent properties, and can be used as an adsorption filler for water treatment or a catalyst carrier for chemical reaction, thus achieving resource utilization of solid wastes.

Description

technical field [0001] The invention belongs to the field of activated carbon preparation, and relates to a mud-based spherical activated carbon and its preparation method and application, in particular to a high-performance mud-based spherical activated carbon with high specific surface area and low apparent density prepared by using sludge and its preparation method and application. application. Background technique [0002] Adsorption is a separation process widely used in chemical production and environmental governance. Adsorption materials with high specific surface area and low apparent density can significantly improve separation efficiency and reduce the cost of separation equipment. In addition, good adsorption materials also require good sphericity and suitable particle size. Due to its stable chemical characteristics and excellent adsorption performance, granular activated carbon is widely used as an adsorption material for the separation of toxic components and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/12B01J20/20B01J20/28B01J20/30B01J21/18B01J32/00
Inventor 关国强常杰
Owner SOUTH CHINA UNIV OF TECH
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