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Method for preparing functional biological carbon by in-situ impregnation

A functional biochar technology, applied in chemical instruments and methods, alkali metal compounds, chemical/physical processes, etc., can solve the problem of uneven distribution, reduce carbonization temperature, promote structural decomposition, and increase specific surface area and porosity Effect

Active Publication Date: 2015-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application publication patent CN103406099A discloses a calcium-magnesium mineralized biochar and its preparation method and application. It is prepared by stirring and impregnating biomass powder in calcium and magnesium salt solutions, drying and dehydrating, and then pyrolyzing; the impregnation process of this method The magnesium and calcium ions cannot be fully and uniformly entered into the biomass raw material, and the calcium and magnesium minerals in the prepared biochar are only loaded in the pores, and the distribution is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] pretreat the rice straw in an equal-volume mixed solution of 0.1 mol / L disodium edetate and 0.5 mol / L sulfuric acid at 60°C for 0.5 hour, the weight of the rice straw accounts for 10% of the total weight of the system, filter, Washing; then impregnating the filtered rice straw in a magnesium sulfate solution containing 0.1mol / L metal ions for loading treatment, the weight of the pretreated rice straw accounts for 10% of the total weight of the system, stirring at room temperature for 1 hour, and filtering to obtain Water-containing and ion-loaded rice straw with a moisture content of 50% by weight, and then the rice straw was transferred to a high-temperature furnace, and the temperature was raised to 100°C at a heating rate of 1°C / min in an air atmosphere, kept for 0.5 hours, and then heated in a nitrogen atmosphere. Under the atmosphere, the temperature was raised to 400° C. at a heating rate of 10° C. / min, kept for 1 hour, and the functional biochar was obtained after...

Embodiment 2

[0028] Pretreat the rice husk in an equal-volume mixed solution of 0.5 mol / L sodium tripolyphosphate and 0.5 mol / L sulfuric acid at 90°C for 1 hour, the weight of the rice husk accounts for 30% of the total weight of the system, filter, and wash with water; then Soak the filtered rice husk in a copper sulfate solution containing 1mol / L metal ions for loading treatment. After pretreatment, the weight of the rice husk accounts for 30% of the total weight of the system, stir at room temperature for 6 hours, and filter to obtain the weight moisture content of 150% rice husk containing loaded ions, then transfer the rice husk to a high-temperature furnace, raise the temperature to 280°C at a heating rate of 3°C / min in an air atmosphere, keep it warm for 2 hours, and then heat it at 100°C in an argon atmosphere. The temperature was raised to 800° C. at a heating rate of 1 / min, and the temperature was maintained for 6 hours. After cooling, functional biochar was obtained, and the cont...

Embodiment 3

[0030] Bamboo was pretreated in an equal-volume mixed solution of 0.25mol / L sodium hexametaphosphate and 0.5mol / L sulfuric acid at 89°C for 0.6 hours, and the weight of bamboo accounted for 20% of the total weight of the system, filtered and washed; then filtered After the bamboo material is immersed in the ferric sulfate solution that contains 0.38mol / L metal ion, carry out loading treatment, the bamboo material weight accounts for 20% of system gross weight after the pretreatment, stirs at room temperature 5 hours, filters, and obtains the weight water content ratio of 60%. Bamboo containing ions, then transferred to a high-temperature furnace, heated to 140°C at a heating rate of 2°C / min in an air atmosphere, kept for 1 hour, and then heated at a heating rate of 50°C / min in an argon atmosphere The temperature was raised to 600° C., the temperature was maintained for 3 hours, and the functional biochar was obtained after cooling. The content of functional particles carried on...

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Abstract

The invention discloses a method for preparing functional biological carbon by in-situ impregnation. The method comprises the following steps: (1) adding a biomass raw material into a pre-treating solution, stirring, dipping and then filtering to obtain a pretreated biomass raw material; (2) adding the pretreated biomass raw material into a impregnation ion solution, stirring, dipping and then filtering to obtain a biomass raw material which contains water and impregnation ions and has water content by weight of 50% to 150%; (3) heating the biomass raw material which contains water and impregnation ions to the temperature of 100-280 DEG C at a speed of 1-3 DEG C / min, and then keeping the temperature for 0.5-2 hours; (4) heating to the temperature of 400-800 DEG C at a speed of 10-100 DEG C / min in an anaerobic or oxygen-limited atmosphere, and keeping the temperature for 1-6 hours; and (5) cooling to obtain the functional biological carbon. According to the method disclosed by the invention, abundant agriculture and forestry wastes are used as raw materials for preparing the functional biological carbon, an in-situ impregnation process is used for regulating a biological carbon structure, and functional particles are controllably and uniformly supported, so the specific surface area and the porosity of the biological carbon are greatly increased, and the biological carbon can be widely applied to the fields such as sewage treatment.

Description

technical field [0001] The invention relates to a method for preparing functional biochar, in particular to a method for preparing functional biochar by using agricultural and forestry waste as raw materials, and belongs to the field of biochar preparation. Background technique [0002] The waste generated in the process of agricultural and forestry processing worldwide is a huge number. In my country alone, the output of rice husk reached about 40 million tons in 2011, and the output of various crop straws exceeded 700 million tons per year. The disposal of these crop stalks, rice husks, etc. is a problem. Pyrolysis is to convert biomass raw materials into other products for utilization by thermal decomposition. It is relatively simple to implement, has a high energy conversion rate, and is also conducive to large-scale processing of biomass raw materials. It is one of the effective methods to solve the above-mentioned agricultural and forestry waste biomass raw materials. ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J21/18B01J23/00B01J35/10
CPCB01J20/20B01J20/3204B01J20/3234B01J21/18B01J23/06B01J23/72B01J23/755B01J23/8892
Inventor 程旭王彪朱方亮王华平
Owner DONGHUA UNIV
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