Biomass granular activated carbon and preparation method thereof

A technology of biomass particles and activated carbon, which is applied in the field of biomass waste recycling, can solve the problems of reduced content of active ingredients, small number of pores, and few micropores, and achieve the effects of increasing pore volume, increasing specific surface area, and reducing hazards

Inactive Publication Date: 2018-06-22
HUAIBEI ZHIHUAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, biomass activated carbon has been widely used in environmental restoration, chemical industry, food industry and other fields due to its advantages of abundant sources, low price, low ash content, and strong thermal stability. Biomass activated carbon is prepared by chemical activation, but the specific surface area and pore number of the finished activated carbon are still difficult to reach a large threshold, and the adsorption strength needs to be improved
[0003] The patent application number is CN201610048010.1, which discloses a method for preparing mixed-based biomass activated carbon from hickory nut shells and corn stalks, using zinc chloride as an activator to soak the mixed biomass of hickory nuts and corn stalks, and then High-temperature activation and pickling, the prepared activated carbon has well-developed mesopores, but less micropores, and is not easy to decolorize, absorb heavy metals and remove small molecular substances. In addition, this method is a conventional method for industrial production or laboratory production of activated carbon. Activated carbon has a small specific surface area and a small number of pores
The patent application number is CN201710588856.9, which discloses a method for preparing activated carbon from biomass and the activated carbon prepared by using waste paper scraps and cotton as biomass materials, and chelating with the activator to form a gel. After high-temperature pyrolysis activation treatment, a large number of porous structures are formed inside and outside the gel, which increases the specific surface area of ​​activated carbon. However, waste paper scraps and cotton are prone to generate a large amount of ash under the action of high temperature, and the content of active ingredients decreases, and the hardness of the activated carbon is low.

Method used

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  • Biomass granular activated carbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: crush 40 parts of coconut shells, 25 parts of miscellaneous wood chips, 16 parts of bagasse, 17 parts of corn stalks, and 18 parts of cow dung to 60 mesh, add 7wt% fermentation bacteria, and cover the film and seal it for 4 days at 25°C to obtain bubbling fermentation products;

[0026] The miscellaneous wood chips include the following components in weight percentage: 45% of bamboo chips, 20% of poplar wood chips, and 35% of pine wood chips; 2 High-yielding yeast, lactic acid bacteria, and Bacillus subtilis are mixed, and the mass ratio of each strain is 2:1:1.5;

[0027] Step 2: Mix 38 parts of fly ash, 16 parts of bentonite, 24 parts of diatomaceous earth and the bubbling fermentation product, and add 5 parts of ammonium bicarbonate. After homogenization, under 60KPa nitrogen condition, the temperature is raised at 8°C / min to 300°C, heat preservation and sintering for 4 hours to prepare porous carbon;

[0028] Step 3: immerse the porous carbon in sodium suc...

Embodiment 2

[0031] The operation is the same as in Example 1, the difference is that step 1: 45 parts of walnut shells, 28 parts of miscellaneous wood chips, 20 parts of bagasse, 20 parts of corn stalks, 22 parts of cow dung, and the weight percentages of each component of miscellaneous wood chips are 37.5% and 25%. , 37.5%, the crushing particle size is 80 meshes, the inoculation amount of fermentation bacteria is 10wt%, and the fermentation temperature and days are respectively 29°C and 5d; Step 2: 40 parts of fly ash, 18 parts of bentonite, 26 parts of diatomite, magnesium carbonate (pore forming agent) 8 parts, the pressure is 70KPa, the heating rate is 10°C / min, the maximum temperature is 400°C, and the holding time is 5h; Step 3: the concentration of sodium succinate is 0.6mol / L, and the soaking time is 4.5h. Activation temperature is 700°C, weight loss rate is 27%; step 4: PH is 6.9, compression pressure is 10MPa, granulation density is 1.4g / cm 3 , The particle size is 1.6cm.

Embodiment 3

[0033] The operation is the same as in Example 1, the difference is that step 1: 50 parts of apricot shells, 30 parts of miscellaneous wood chips, 24 parts of bagasse, 23 parts of corn stalks, 26 parts of cow dung, and the weight percentages of each component of miscellaneous wood chips are 30% and 30%. , 40%, the crushing particle size is 100 mesh, the inoculation amount of fermentation bacteria is 13wt%, the fermentation temperature and the number of days are respectively 33°C and 6d; Step 2: 42 parts of fly ash, 20 parts of bentonite, 28 parts of diatomaceous earth, ammonium phosphate (Porogen) 11 parts, the pressure is 80KPa, the heating rate is 12°C / min, the maximum temperature is 500°C, and the holding time is 6h; Step 3: The concentration of sodium succinate is 0.8mol / L, the soaking time is 6h, and activation The temperature is 750°C, the weight loss rate is 30%; Step 4: PH is 7.0, the compression pressure is 12MPa, and the granulation density is 1.5g / cm 3 , The particl...

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Abstract

The invention discloses biomass granular activated carbon. The biomass granular activated carbon comprises, by weight, 40-50 parts of fruit shell, 25-30 parts of mixed wood chips, 16-24 parts of bagasse, 17-23 parts of corn straw, 18-26 parts of cow dung, 38-42 parts of fly ash, 16-20 parts of bentonite, 24-28 parts of diatomaceous earth, 12-16 parts of sodium succinate and 5-11 parts of pore forming agents. A preparation method of the biomass granular activated carbon includes the following steps that under anaerobic conditions, bacteria strains are domesticated to obtain CO2 high-yield fermenting bacteria, the biomass raw materials are fermented by using the CO2 high-yield fermenting bacteria, a fermentation product is mixed with the fly ash, the bentonite and the diatomaceous earth andsintered into carbon under the action of the pore forming agents, and sodium succinate is used for impregnation and activation. Recycling of biomass waste is achieved, the specific surface area and porosity of the produced activated carbon are up to 1186.9 m<2>/g and 71.8% respectively, the adsorption capability and decolorization capability are excellent, and the biomass granular activated carboncan be widely applied to the fields of environmental protection, industrial production and agricultural production.

Description

technical field [0001] The invention relates to the technical field of biomass waste recycling, in particular to a biomass granular activated carbon and a preparation method thereof. Background technique [0002] Biomass raw materials include five categories: wood waste, agricultural straw, human and animal manure, sugar crop residue, and urban waste, which are mainly used in the production and processing of agricultural fertilizers, livestock feed, and biofuels. In recent years, biomass activated carbon has been widely used in environmental restoration, chemical industry, food industry and other fields due to its advantages of abundant sources, low price, low ash content, and strong thermal stability. Biomass activated carbon is prepared by chemical activation, but the specific surface area and pore number of the finished activated carbon are still difficult to reach a large threshold, and the adsorption strength needs to be improved. [0003] The patent application number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318C01B32/324
Inventor 李洋吴义成
Owner HUAIBEI ZHIHUAI TECH CO LTD
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