Method for preparing high-adsorbability activated carbon by using rice hulls as raw material

A high adsorption and activated carbon technology, applied in the direction of solid waste removal, etc., can solve the problems of many sets of activated carbon equipment, high precision requirements, complex technology, etc., and achieve less equipment sets, high relative yield and simple process Effect

Inactive Publication Date: 2011-04-06
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above two methods for preparing activated carbon have many sets of equipment, high precisi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dry the filter residue, soak it with zinc chloride and potassium chloride co-solution at 70°C for 20 hours, wherein the mass concentration of zinc chloride in the co-solution is 20%, and the mass concentration of potassium chloride is 10%; take out the filter residue and pour Put it into a porcelain crucible, put it into a muffle furnace and activate it at 400°C for 2 hours; wash it with 8% mass concentration of washing liquid hydrochloric acid, filter, wash with water until neutral, dry it at 120°C, and grind it.

Embodiment 2

[0022] Dry the filter residue, soak it with zinc chloride and potassium chloride co-solution at 80°C for 10 hours, wherein the mass concentration of zinc chloride in the co-solution is 60%, and the mass concentration of potassium chloride is 2%; take out the filter residue and pour Put it into a porcelain crucible, put it into a muffle furnace and activate it at 800°C for 1 hour; wash it with a washing liquid with a mass concentration of 12% hydrochloric acid, filter, wash with water until neutral, dry it at 105°C, and grind it.

Embodiment 3

[0024] Dry the filter residue, soak it with zinc chloride and potassium chloride co-solution at 75°C for 15 hours, wherein the mass concentration of zinc chloride in the co-solution is 40%, and the mass concentration of potassium chloride is 5%; take out the filter residue and pour Put it into a porcelain crucible, put it into a muffle furnace and activate it at 600°C for 1.5 hours; wash it with 10% mass concentration of washing liquid hydrochloric acid, filter, wash with water until neutral, dry it at 112°C, and grind it.

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Abstract

The invention relates to a method for preparing high-adsorbability activated carbon by using rice hulls as a raw material. The method comprises the following steps of: providing rice hulls, carrying out acid and alkali treatment and washing the rice hulls to obtain neutral filter residue; drying the filter residue, soaking in an eutectic solution of zinc chloride and potassium chloride at 70-80 DEG C for not less than 9h; taking out the filter residue, pouring into a porcelain crucible, putting into a muffle furnace to activate at 400-800 DEG C for 1-2h; washing, filtering and washing with water to be neutral; and drying and grinding to obtain the product, wherein in the eutectic solution of the zinc chloride and the potassium chloride, the mass concentration of the zinc chloride is 20-60 percent, and the mass concentration of the potassium chloride is 2-10 percent. The invention is easy to form a thin hole structure and can manufacture activated carbon with robust holes and better adsorbability, and the activating method has less carbon loss and relative high carbon yield.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing highly adsorbable activated carbon from rice husk raw materials. Background technique [0002] Activated carbon is a porous carbon material that has been widely used in chemical industry, food processing, transportation energy, medical and health care, agriculture, national defense and other fields. [0003] It is known that in the method of preparing activated carbon using rice husk as raw material, the chemical activation method can produce activated carbon with more developed pores and better adsorption performance than the gas activation method, and the activation of the chemical activation method can be performed at a relatively low temperature. [0004] The commonly used chemical activation method is to treat the rice husk with acid (remove a small amount of metal and other impurities), wash the filter residue to neutrality, and then treat it...

Claims

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Application Information

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IPC IPC(8): C01B31/12B09B3/00
Inventor 邝水红付文刘文星陈德强
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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