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Method for preparing activated carbon by using flax straws

A technology for preparing activated carbon and hemp stalks, which is applied in the field of powdered activated carbon preparation to achieve the effects of reducing production costs, protecting the environment, and saving production cycles

Inactive Publication Date: 2012-03-21
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using low concentration of potassium permanganate as an activator, the relevant research on the preparation of activated carbon under the condition of extremely low activator and raw material impregnation ratio has not been reported yet.

Method used

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  • Method for preparing activated carbon by using flax straws
  • Method for preparing activated carbon by using flax straws

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The kenaf or jute is peeled, crushed, passed through a 40-mesh sieve, and dried at 105°C for 12 hours to obtain a pretreated dry material weighing 20g, and the mass ratio of the potassium permanganate solution with a mass concentration of 0.2% is 2: 100 and mix evenly, impregnate at room temperature for 12 hours, then dry at 105°C for 24 hours to obtain a mixture. Then put the mixture in a muffle furnace, raise the temperature to 800°C at a rate of 5°C / min, keep it warm for 120 minutes, the temperature difference during the heat preservation period is less than ±15°C, and cool naturally to room temperature to obtain a carbonized activated sample. Finally, the carbonized activated sample was cooked with 5% HCl solution at 70°C for 30 minutes, then repeatedly washed with deionized water until the pH was 6~7, dried at 105°C for 24 hours, finally ground, and passed through a 200-mesh sieve to obtain a powder Activated carbon finished product.

Embodiment 2

[0022] The kenaf or jute is peeled, crushed, passed through a 40-mesh sieve, and dried at 120°C for 12 hours to obtain a pretreated absolute dry material weighing 20g, and the mass ratio of the potassium permanganate solution with a mass concentration of 0.6% is 1: 100 and mix evenly, impregnate at room temperature for 8 hours, then dry at 120°C for 12 hours to obtain a mixture. Then put the mixture in a muffle furnace, raise the temperature to 900°C at a rate of 10°C / min, hold it for 60 minutes, and keep the temperature difference less than ±15°C during the hold, and cool it down to room temperature naturally to obtain a carbonized activated sample. Finally, the carbonized activated sample was digested with 10% HCl solution at 90°C for 60 minutes, then repeatedly washed with deionized water until the pH was 6~7, dried at 120°C for 12 hours, finally ground, and passed through a 200-mesh sieve to obtain a powder Activated carbon finished product.

Embodiment 3

[0024] The kenaf or jute is peeled, crushed, passed through a 40-mesh sieve, and dried at 110°C for 12 hours to obtain a pretreated dry material weighing 20g, and the mass ratio of the potassium permanganate solution with a mass concentration of 1.0% is 6: 100, mix evenly, soak at room temperature for 4 hours, then dry at 108°C for 18 hours to obtain a mixture. Then put the mixture in a muffle furnace, raise the temperature to 700°C at a rate of 8°C / min, hold it for 180 minutes, and keep the temperature difference less than ±15°C during the hold, and cool it down to room temperature naturally to obtain a carbonized activated sample. Finally, the carbonized activated sample was cooked with 8% HCl solution at 80°C for 45min, then repeatedly washed with deionized water until the pH was 6~7, dried at 108°C for 20h, finally ground, and passed through a 200-mesh sieve to obtain a powder Activated carbon finished product.

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Abstract

The invention discloses a method for preparing activated carbon by using flax straws. The method comprises the following technological processes of: performing treatments of peeling, crushing, sieving through a 40-mesh screen, drying for 12-24h at 105-120 DEG C and the like on the flax straws to obtain absolute dry pretreated materials, uniformly mixing the absolute dry pretreated materials with an activator solution, impregnating for 4-12h at room temperature, then drying for 12-24h at 105-120 DEG C, placing in a muffle furnace, heating to 700-900 DEG C, preserving the heat for 1-3h, naturally cooling to room temperature, and then performing acid cleaning, water washing, drying, grinding, and sieving through a 200-mesh screen to obtain a finished product of powdery activated carbon. In the method, the flax straws are used as raw materials, a novel activator with low impregnation ratio is adopted to prepare the activated carbon with special performance. In addition, the activated carbon with favorable performance is prepared by means of multiple activation functions induced by an activator high-temperature pyrolysis effect in the method, so that the dose of the activator and the production cost are reduced, and the obvious economic and social benefits are achieved.

Description

technical field [0001] The invention relates to a method for preparing activated carbon by using hemp stalks, in particular to a method for preparing activated carbon with potassium salt as an activator, and belongs to the technical field of powdered activated carbon preparation. Background technique [0002] Activated carbon is a carbonaceous material with special microcrystalline structure, developed pore structure, high specific surface area and strong adsorption capacity. It has good chemical stability and has the characteristics of acid resistance, alkali resistance and high temperature resistance. There are more and more researches and application developments on activated carbon. To meet the requirements of stable performance and low cost of the prepared activated carbon, the raw materials must be of stable quality and easy to obtain, and the production process must be simple, economical and environmentally friendly. The development of the use of low-grade activated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 陈燕丹陈卫群
Owner FUJIAN AGRI & FORESTRY UNIV
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