New method for producing active carbon by using biomass wastes

A technology for biomass waste and activated carbon production, which is applied in the removal of solid waste and other directions, can solve problems such as land occupation and atmospheric pollution, and achieve the effects of high conversion rate, good adsorption performance, and increased pore structure.

Inactive Publication Date: 2011-05-04
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment and disposal methods of biomass waste are mainly divided into two categories. One is to pile up or bury the waste in a centralized way, which takes up a l

Method used

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  • New method for producing active carbon by using biomass wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Pre-treat raw walnut shells: dry to a moisture content below 15%, mechanically crush, and pass through a 100-mesh sieve.

[0031] 2. Add pyrolusite to the raw walnut shell at a ratio of 5%-10% and mix well.

[0032] 3. Impregnate the product of step 2 with 3mol / L zinc chloride solution for 24 hours (impregnation ratio 1:1).

[0033] 4. The product of step 3 is carbonized and activated in a tube furnace at 500°C for 1 hour (protected by nitrogen).

[0034] 5. After cooling the product of step 4 to room temperature, it is washed with a 3mol / l hydrochloric acid solution, and then rinsed with water at 60°C until it is neutral.

[0035] 6. After drying and grinding the product obtained in step 5, a finished activated carbon product is obtained.

[0036] According to the method specified in GB / T12496.8-1999, the iodine adsorption value of the activated carbon product of this example is measured to be 1287.53 mg / g.

Embodiment 2

[0038] 1. The raw material Chinese medicine residue (Ophiopogon japonicus) is pretreated: dried to a moisture content of less than 15%, mechanically crushed, and passed through a 100-mesh sieve.

[0039] 2. Add pyrolusite to the raw material Chinese medicine residue (Ophiopogon japonicus) at a ratio of 5%-10%, and mix well.

[0040] 3. Impregnate the product of step 2 with 3mol / L zinc chloride solution for 24 hours (impregnation ratio 1:1).

[0041] 4. The product of step 3 is carbonized and activated in a tube furnace at 500°C for 1 hour (protected by nitrogen).

[0042] 5. After cooling the product of step 4 to room temperature, it is washed with a 3mol / l hydrochloric acid solution, and then rinsed with water at 60°C until it is neutral.

[0043] 6. After drying and grinding the product obtained in step 5, a finished activated carbon product is obtained.

[0044] According to the method specified in GB / T12496.8-1999, the iodine adsorption value of the activated carbon product of this e...

Embodiment 3

[0046] 1. Pretreatment of raw wheat stalks: drying to a moisture content of less than 15%, mechanically crushing, and passing through a 100-mesh sieve.

[0047] 2. Add the pyrolusite to the raw wheat stalk at a ratio of 5%-10%, and mix well.

[0048] 3. Impregnate the product of step 2 with 3mol / L zinc chloride solution for 24 hours (impregnation ratio 1:1).

[0049] 4. The product of step 3 is carbonized and activated in a tube furnace at 500°C for 1 hour (protected by nitrogen).

[0050] 5. After cooling the product of step 4 to room temperature, it is washed with 3mol / l hydrochloric acid solution, and then rinsed with water at 60°C until it is neutral.

[0051] 6. After drying and grinding the product obtained in step 5, a finished activated carbon product is obtained.

[0052] According to the method specified in GB / T12496.8-1999, the iodine adsorption value of the activated carbon product of this example is measured to be 1431.47mg / g.

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Abstract

The invention discloses a new method for producing efficient active carbon by using biomass wastes (walnut shells, rape stems, wheat straws, Chinese medicinal dregs and the like) as raw materials, using pyrolusite as a hole forming agent and using zinc chloride as an active agent. The method comprises the following processes of: (1) drying the biomass waste raw materials till the water content is less than 15 percent, mechanically crushing the raw materials, and sieving the crushed raw materials with a sieve of 100 meshes; (2) adding 5 to 10 percent of pyrolusite into the raw materials, and mixing the pyrolusite and the raw materials uniformly; (3) soaking the pre-treated raw materials into 3 to 7mol/L zinc chloride solution for 24 hours, wherein the soaking ratio (the mass of the raw materials to the mass of the zinc chloride solution) is 1:1-1:2; (4) putting the soaked raw materials into a tubular furnace, introducing inert gas (such as nitrogen or carbon dioxide gas), heating to the temperature of between 400 and 600 DEG C, and performing one-step carbonization (synchronous carbonization and activation) for 0.5 to 1.5 hours; and (5) cooling, washing and drying the activated carbide to obtain the active carbon. The method improves the performance of the active carbon, reduces the preparation cost of the active carbon, and realizes recycling utilization.

Description

Technical field [0001] The invention relates to a new method for producing activated carbon by using biomass waste as a raw material, adding pyrolusite as a pore former, and using zinc chloride as an activator. Background technique [0002] Activated carbon is a kind of micro-quality carbon material made of carbon-containing materials with black appearance, developed internal void structure, large specific surface area and strong adsorption capacity. It is a commonly used adsorbent, catalyst or catalyst carrier, which is widely used in almost all scientific research and national economic sectors such as chemistry, biotechnology, food, medicine, national defense, environmental protection, energy, and people’s daily life. The scope is getting wider and wider, and the demand is steadily increasing year by year. [0003] The core part of activated carbon technology is the carbon-containing raw materials used and the corresponding preparation process. [0004] The raw materials for prep...

Claims

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Application Information

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IPC IPC(8): C01B31/12B09B3/00
Inventor 羊依金刘巍谭显东刘盛余信欣
Owner CHENGDU UNIV OF INFORMATION TECH
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