Method for preparing activated charcoal from paper mill sludge and pine through co-pyrolysis

A papermaking sludge and biochar technology, which is applied in the field of environmental pollution control and resource utilization of agricultural and forestry waste, can solve the problems of increasing sludge treatment costs, increasing sludge treatment procedures, affecting the performance and adsorption effect of biochar adsorbents, etc. , to achieve the effect of improving the chemical composition and improving the adsorption capacity

Inactive Publication Date: 2014-10-01
ZHEJIANG MARINE DEV RES INST
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the high moisture content of sludge, the traditional pyrolysis process needs to dry the sludge, which not only increases the sludge treatment process, but also greatly increases the slu

Method used

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  • Method for preparing activated charcoal from paper mill sludge and pine through co-pyrolysis
  • Method for preparing activated charcoal from paper mill sludge and pine through co-pyrolysis
  • Method for preparing activated charcoal from paper mill sludge and pine through co-pyrolysis

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Experimental program
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Effect test

Embodiment 1

[0020] (1) Take the papermaking sludge after mechanical dehydration for pretreatment, wash the impurities on the surface of the sludge with deionized water, and obtain the raw sludge;

[0021] (2) After the pine chips collected are naturally air-dried, they are pulverized through a 40-mesh sieve;

[0022] (3) papermaking sludge and pine chips obtained in step (1) and step (2) are fully mixed in a mass ratio of 2:3;

[0023] (4) Put the mixture obtained in step (3) in the hopper of the pyrolysis furnace, set the reaction temperature to 850°C, and when the temperature reaches the set value and remains stable, nitrogen gas is introduced to uniformly send the raw materials into the pyrolysis furnace. In the furnace, biochar is guaranteed to be generated under anaerobic conditions;

[0024] (5) Continue heating at a set reaction temperature of 850°C until no gas is produced during the reaction, then stop heating. After the biochar is naturally cooled to room temperature, take it o...

Embodiment 2

[0039] (1) Take the papermaking sludge after mechanical dehydration for pretreatment, wash the impurities on the surface of the sludge with deionized water, and obtain the raw sludge;

[0040] (2) After the pine chips collected are naturally air-dried, they are pulverized through a 40-mesh sieve;

[0041] (3) papermaking sludge and pine chips obtained in step (1) and step (2) are fully mixed in a mass ratio of 1:9;

[0042] (4) Put the mixture obtained in step (3) in the hopper of the pyrolysis furnace, set the reaction temperature to 600°C, and when the temperature reaches the set value and remains stable, nitrogen gas is introduced to uniformly send the raw materials into the pyrolysis furnace. In the furnace, biochar is guaranteed to be generated under anaerobic conditions;

[0043] (5) Under the condition that the reaction temperature is set at 600°C, continue to heat until no gas is produced during the reaction, then stop heating, and after the biochar is naturally coole...

Embodiment 3

[0048] (1) Take the papermaking sludge after mechanical dehydration for pretreatment, wash the impurities on the surface of the sludge with deionized water, and obtain the raw sludge;

[0049] (2) After the pine chips collected are naturally air-dried, they are pulverized through a 40-mesh sieve;

[0050] (3) papermaking sludge and pine chips obtained in step (1) and step (2) are fully mixed in a mass ratio of 1:5;

[0051] (4) Put the mixture obtained in step (3) in the hopper of the pyrolysis furnace, set the reaction temperature to 750°C, and when the temperature reaches the set value and remains stable, nitrogen gas is introduced to uniformly send the raw materials into the pyrolysis furnace. In the furnace, biochar is guaranteed to be generated under anaerobic conditions;

[0052] (5) Continue heating at a set reaction temperature of 750°C until no gas is generated during the reaction, then stop heating. After the biochar is naturally cooled to room temperature, take it ...

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Abstract

The invention discloses a method for preparing activated charcoal from paper mill sludge and pine through co-pyrolysis. The method is characterized by comprising the following steps: (1) pretreating paper mill sludge; (2) airing and grinding pine sawdust; (3) fully mixing the sludge and the pine sawdust; (4) arranging the mixture in a pyrolyzing furnace feeding hopper, and performing constant temperature pyrolysis in an inert atmosphere; (5) heating for reacting at constant temperature until no gas is generated, and naturally cooling to room temperature, thereby obtaining charcoal; and (6) putting the charcoal into a sulfuric acid solution with the concentration of 2.5-3.5 mol/L, introducing nitrogen, reacting at the constant temperature of 500-600 DEG C for 20-40 minutes, and naturally cooling to room temperature, thereby obtaining the activated charcoal. The activated charcoal is prepared by a paper mill sludge and pine co-pyrolysis process, a sludge drying process is not needed, chemical components of adsorbents are improved, and a certain effect of activating the charcoal can be achieved by steam formed by moisture in the sludge at high temperature, so that the adsorption capacity of the charcoal is improved, and an ideal adsorption effect is obtained.

Description

technical field [0001] The invention relates to the fields of environmental pollution control and resource utilization of agricultural and forestry waste, and specifically refers to a method for preparing activated biochar by co-pyrolyzing papermaking sludge and pine wood. Background technique [0002] Papermaking sludge is the terminal product generated by wastewater treatment in the papermaking process. According to statistics, for every ton of recycled paper produced, about 700 tons of sludge with a water content of 75% to 85% will be produced, and its components mainly contain hemicellulose. , cellulose and lignin and other polymeric organic matter, as well as coagulants, fillers, etc., and does not contain heavy metal substances, it is a biomass resource. However, due to its high water content, complex composition and relatively difficult treatment, the treatment cost of papermaking sludge accounts for more than 50% of the cost of water treatment operation equipment. Th...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C01B31/08
Inventor 徐珊陆阿定杨会成胡建坤
Owner ZHEJIANG MARINE DEV RES INST
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