Preparation method of coal active carbon with low heavy metal content

A coal-based activated carbon, low heavy metal technology, applied in non-metallic elements, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of high heavy metal content and restrictions

Active Publication Date: 2018-01-09
大同市金盛豪达炭业有限责任公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In the production process of coal-based activated carbon, in the process of coal conversion and utilization, except for a small part of heavy metal elements and their compounds volatilized, most of them will be enriched in the activated carbon, so t

Method used

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preparation example Construction

[0019] The invention provides a method for preparing coal-based activated carbon with low heavy metal content, comprising the following steps:

[0020] (1) The first coal type and the second coal type are respectively destoned and flotation successively to obtain the first coal type floating coal and the second coal type floating coal; the ash content of the first coal type is 4~6wt.%. The ash content of the second type of coal is 2.5-5wt.%, the content of volatile matter is 27-30wt.%, and the cohesion index is ≤1; The density of the heavy liquid used in the flotation of the first coal type and the second coal type is independently 1.35-1.45g·cm -3 ;

[0021] (2) After mixing the first coal type floating coal and the second coal type floating coal, milling, briquetting, carbonization and activation are carried out successively to obtain the activation material;

[0022] (3) The activated material is crushed and washed in sequence to obtain coal-based activated carbon with lo...

Embodiment 1

[0049] (1) The first coal type (ash content is 3.9wt.%, volatile matter content is 33.4wt.%, caking index is 1.9) and the second coal type (ash content is 2.8wt.%, volatile matter content is 28.9wt.%, cohesive index is 0.8) were crushed into seed coal with a particle size of 5-6mm; then use the density of 1.38g cm -3 The zinc chloride heavy liquid carries out flotation, water washing and drying to the first coal seed coal and the second coal seed coal respectively to obtain the first coal float coal and the second coal float coal; the obtained first coal float The moisture content of the floating coal and the second coal floating coal is less than 10wt.%; the drying is carried out in a converter with a diameter of 1.0m and a length of 12m, and the drying pressure is 98kPa and the temperature is 425°C;

[0050] (2) Get the first coal type floating coal 85kg, the second coal type floating coal 15kg and mix to obtain the mixed coal type;

[0051] (3) Grinding the mixed coal type...

Embodiment 2

[0067] (1) The first coal type (ash content is 3.6wt.%, volatile matter content is 34.1wt.%, caking index is 2.1) and the second coal type (ash content is 2.65wt.%, volatile matter content is 29.1wt.%, cohesive index is 0.9) were crushed into seed coal with a particle size of 5-6mm; then use a density of 1.38g·cm -3 The zinc chloride heavy liquid carries out flotation, water washing and drying to the first coal seed coal and the second coal seed coal respectively to obtain the first coal float coal and the second coal float coal; the obtained first coal float The moisture content of the floating coal and the second type of coal floating coal is less than 11wt.%; the drying is carried out in a converter with a diameter of 1.0m and a length of 12m, and the drying pressure is 82kPa and the temperature is 430°C;

[0068] (2) Get the first coal type floating coal 90kg, the second coal type floating coal 10kg and mix to obtain the mixed coal type;

[0069] (3) Grinding the mixed co...

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Abstract

The invention provides a preparation method of coal active carbon with low heavy metal content. The preparation method comprises the following steps: respectively carrying out stone removal and flotation on a first coal type and a second coal type, thereby obtaining a first type of float coal and a second type of float coal, wherein for the first coal type, the ash content is 4 to 6 weight percent, the volatile component content is 31 to 36 weight percent, and the caking index is 0.8 to 2.6, and for the second coal type, the ash content is 2.5 to 5 weight percent, the volatile component content is 27 to 30 weight percent, and the caking index is less than or equal to 1; the densities of heavy liquid for floatation of the first coal type and the second coal type are independently 1.35 to 1.45 g.cm<-3>; mixing the first type of float coal and the second type of float coal, and carrying out grinding, briquettingm carbonization and activation on the mixture, thereby obtaining an activatedmaterial; crushing and washing the activated mixture in sequence, thereby obtaining the coal active carbon with the low heavy metal content, wherein washing comprises alkaline washing, water washing,acidic washing and water vapor heating washing. The preparation method can obviously reduce the heavy metal content of the coal active carbon.

Description

technical field [0001] The invention relates to the technical field of solid adsorption materials, in particular to a method for preparing coal-based activated carbon with low heavy metal content. Background technique [0002] In recent years, with the improvement of people's awareness and understanding of environmental protection, activated carbon has been widely used in the fields of gas phase adsorption, liquid phase adsorption, solvent recovery, refined decolorization, food and pharmaceuticals, etc., and the requirements for the content of heavy metal elements in activated carbon are also increasing. Getting stricter. Taking activated carbon for water purification as an example, the CJ343-2010 water quality standard for sewage discharged into urban sewers stipulates that the heavy metal content is less than 1ppm for Pb, less than 1.5ppm for Cr, less than 0.02ppm for Hg, and less than 0.1ppm for cadmium and Cd. content needs to be lowered. [0003] Coal-based activated ...

Claims

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Application Information

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IPC IPC(8): C01B32/318C01B32/336B01J20/20B01J20/30
Inventor 贺守印
Owner 大同市金盛豪达炭业有限责任公司
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