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Method for preparing magnesium oxide-based activated carbon

A technology based on activated carbon and activated carbon, applied in the field of preparation of magnesium oxide-based activated carbon, can solve the problems of uncontrollable magnesium oxide content in activated carbon, inability to effectively load magnesium oxide, poor decolorization effect, etc. Effect of Controlling Magnesium Oxide Content

Inactive Publication Date: 2017-12-01
贺守印
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Magnesium oxide activated carbon sold in the market is mainly obtained by directly mixing activated carbon and magnesium oxide mechanically. Magnesium oxide cannot be effectively loaded on activated carbon, and the content of magnesium oxide on activated carbon cannot be controlled, resulting in poor decolorization effect

Method used

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preparation example Construction

[0019] The invention provides a kind of preparation method of magnesium oxide-based activated carbon, comprising the following steps:

[0020] (1) Adsorption reaction is carried out after activated carbon is mixed with magnesium salt aqueous solution, obtains magnesium salt-activated carbon composite;

[0021] (2) carry out precipitation reaction after mixing described magnesium salt-activated carbon composite with alkaline aqueous solution, obtain magnesium hydroxide-activated carbon composite;

[0022] (3) The magnesium hydroxide-activated carbon composite is roasted anaerobically to obtain magnesium oxide-based activated carbon.

[0023] In the invention, the activated carbon is mixed with the magnesium salt aqueous solution and then subjected to adsorption reaction to obtain the magnesium salt-activated carbon composite. In the present invention, the activated carbon is preferably coal-based activated carbon. In the present invention, the ash content of the activated car...

Embodiment 1

[0062] (1) The first coal type (ash content is 3.6wt.%, volatile matter content is 33.7wt.%, caking index is 1.3) and the second coal type (ash content is 2.8wt.%, volatile matter content is 28.6wt.%, caking index is 0.7) and dry to moisture content respectively to be 4.6wt.%, the first coal type 85kg after described drying and the second coal type 15kg are mixed, obtain mixed coal type; The pressure is 98kPa and the temperature is 280°C;

[0063] (2) Grinding the mixed coal type to obtain a powder material with a particle size ≤ 55 μm, and then pressing the powder material into a block-shaped briquetting material, the pressure used for the briquetting is 26MPa, and the rotating speed is 28Hz. The strength of the block is 97%;

[0064] (3) Oxidize the briquette obtained in step (2) in flowing hot air with a temperature of 255° C. and a pressure of 80 kPa, and the oxidation time is 6.5 hours to obtain an oxidized briquette;

[0065] (4) The oxidized briquette is heated to a t...

Embodiment 2

[0072] (1) The first coal type (ash content is 3.4wt.%, volatile matter content is 35.1wt.%, caking index is 1.53) and the second coal type (ash content is 2.6wt.%, volatile matter content is 29.3wt.%, caking index is 0.85) dry to water content is 4.4wt.% respectively, the first coal type 90kg after described drying and the second coal type 10kg are mixed, obtain mixed coal type; The pressure is 100kPa and the temperature is 280°C;

[0073] (2) Grinding the mixed coal type to obtain a powder material with a particle size ≤ 55 μm, and then pressing the powder material into a block-shaped briquetting material, the pressure used for the briquetting is 26MPa, and the rotating speed is 28Hz. The strength of the block is 98%;

[0074] (3) Oxidize the briquette obtained in step (2) in flowing hot air with a temperature of 260° C. and a pressure of 80 kPa, and the oxidation time is 7 hours to obtain an oxidized briquette;

[0075] (4) The oxidized briquette is heated to a temperature ...

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Abstract

The invention provides a method for preparing magnesium oxide-based activated carbon. The method comprises the following steps: mixing activated carbon and an aqueous solution of a magnesium salt, and carrying out an adsorption reaction so as to obtain a magnesium salt-activated carbon compound; mixing the magnesium salt-activated carbon compound with an alkaline aqueous solution, and carrying out a precipitation reaction so as to obtain a magnesium hydroxide-activated carbon compound; and performing oxygen-free roasting on the magnesium hydroxide-activated carbon compound, thereby obtaining the magnesium oxide-based activated carbon. According to the preparation method provided by the invention, the content of magnesium oxide in the magnesium oxide-based activated carbon can be effectively controlled, and the magnesium oxide-based activated carbon with uniform distribution of the magnesium oxide can be obtained.

Description

technical field [0001] The invention relates to the technical field of solid adsorption materials, in particular to a preparation method of magnesium oxide-based activated carbon. Background technique [0002] Magnesia-based activated carbon is a composite material of magnesium oxide and activated carbon. The hydrophilicity of inorganic materials combined with the high specific surface area and strong adsorption force of activated carbon make it a porous adsorption material with unique performance, and its decolorization effect is greatly improved. It is also more widely used, such as decolorization, deacidification, dephosphatidification, and peroxide removal in vegetable oil processing; as an antibacterial agent, adsorbent for wastewater treatment, etc. [0003] The magnesium oxide activated carbon sold in the market is mainly obtained by directly mixing activated carbon and magnesium oxide mechanically. The magnesium oxide cannot be effectively loaded on the activated car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/354C01B32/33C01B32/336C01F5/08C01F5/22
CPCC01F5/08C01F5/22C01P2006/12
Inventor 贺守印
Owner 贺守印
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