Method for preparing high grade activated carbon from rice husk ash

A production method and technology of rice husk ash, applied in the field of co-production of water glass and activated carbon with rice husk ash, can solve the problems of no practical production application and high cost of raw materials, achieve the effect of safe and non-toxic production process, and overcome the problem of excessive ash content

Inactive Publication Date: 2008-09-17
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, some researchers have used potassium hydroxide activation method to prepare rice husk activated carbon, and its specific surface area is as high as 2000m 2 /g (the methylene blue adsorption value is about 3

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  • Method for preparing high grade activated carbon from rice husk ash

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Embodiment 1

[0019] Embodiment one: a kind of rice husk ash of the present invention produces the production method of high-quality activated carbon, adopts following process step: its component and proportioning are by weight:

[0020] The invention uses rice husk ash to prepare water glass as raw material (silicon dioxide content in the alkali-soluble filter residue is 40%-45%). Wash the alkali-soluble wet slag after preparing water glass from rice husk ash with hot water at 80°C to pH 10, and then use hydrochloric acid with a concentration of 0.5mol / L, according to the dosage of 6 parts of hydrochloric acid per 1 part of alkali-soluble filter residue. Acid washing, after pickling, the solid alkali-soluble filter residue is obtained; wash with 80°C hot water for the second time and wash to neutrality, and the alkali-soluble filter residue after washing should meet the following standards: carbon content is greater than 55%; methylene blue adsorption value is greater than 6mL / 0.1g; parti...

Embodiment 2

[0024] Embodiment two: a kind of rice husk ash of the present invention produces the production method of high-quality activated carbon, is characterized in that adopts following processing steps: its component and proportioning are by weight:

[0025] Wash the alkali-soluble wet slag after preparing water glass from rice husk ash with hot water at 85°C to pH 10, and then use hydrochloric acid with a concentration of 0.5mol / L, according to the amount of 7 parts of hydrochloric acid solution per 1 part of alkali-soluble filter residue. Pickling, washing the solid obtained after pickling with hot water at 85°C for a second time until neutral. Stir the alkali-soluble filter residue after the above-mentioned secondary water washing into potassium hydroxide to activate at high temperature. High-temperature activation: Dissolve 3.2 parts of potassium hydroxide in 5 parts of cold water, add 1 part of washed alkali-soluble filter residue immediately after it is completely dissolved, s...

Embodiment 3

[0026] Embodiment three: a kind of rice husk ash of the present invention produces the production method of high-quality activated carbon, is characterized in that adopts following processing step: its component and proportioning are by weight:

[0027] Wash the alkali-soluble wet slag after preparing water glass from rice husk ash with hot water at 90°C to pH 9, and then use hydrochloric acid with a concentration of 0.5mol / L to acidify according to the amount of 7 parts of hydrochloric acid required for every 1 part of alkali-soluble filter residue. Wash the solid obtained after acid washing with 90°C hot water for a second time and wash until neutral. Stir the alkali-soluble filter residue after the above-mentioned secondary water washing into potassium hydroxide to activate at high temperature. High-temperature activation: Dissolve 3.5 parts of potassium hydroxide in 5.5 parts of cold water, add 1 part of washed alkali-soluble filter residue immediately after it is complete...

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Abstract

The invention relates to a high quality active carbon production method using rice husk ash, belonging to active carbon manufacture technical field, which is characterized in that the water glass is made utilizing rice husk ash, and the alkali resolved filter residue is filtered and activated using potassium hydroxide as activator; the active carbon with high absorption value is made after rising and drying. The silicon dioxide in the alkali resolved filter residue is efficiently eliminated while in activation in the invention; the absorption performance of the obtained active carbon is good, and the methylene blue adsorption reaches to more than 20 mL/0.1 g; each index meet national standard. The high quality active carbon is made utilizing the alkali resolved filter residue after the water class is made by rice husk ash; the produced active carbon has the advantages of good quality (the methylene blue adsorption reaches to more than 20 mL/0.1 g and ash is lower than 3%) and low production cost; the pollution of rice husk ash alkali resolved filter residue to environment can be reduced.

Description

technical field [0001] The invention relates to a method for using rice husk ash to co-produce water glass and activated carbon, in particular to chemically activate the waste residue after preparing water glass from rice husk ash to produce activated carbon with high adsorption performance, which belongs to the technical field of activated carbon manufacture. Background technique [0002] Combustion heat production is currently the most common way to utilize rice husks in my country. The rice husk ash produced after combustion is mainly composed of silicon dioxide and carbon. At present, the most important way of utilization is to prepare water glass by alkali dissolution. The precipitation of silicon, the increase of erosion degree and the action of water vapor increase the pores of rice husk ash and expand the specific surface area, which can be made into activated carbon after further washing. However, because the alkali crystals blocked in the pores of the alkali-soluble...

Claims

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Application Information

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IPC IPC(8): C01B31/08
Inventor 陈正行耿敏
Owner JIANGNAN UNIV
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