Preparation method of straw-based magnetic charcoal

A biochar, straw technology, applied in biofuels, chemical instruments and methods, waste fuels, etc., can solve the problems of short industrial chain, endanger human health, pollute the air environment, etc., achieve good thermal stability, improve utilization, The effect of large specific surface area

Inactive Publication Date: 2019-05-17
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there are the following disadvantages. The cost of machinery and equipment in the process of collecting, transporting and utilizing rice straw is too high, the industrial chain is short, lack of technical support, and people have misunderstandings, etc., resulting in low utilization rate of crop straw.
The incineration process pollutes the air environment, endangers human health, and easily causes fires

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of straw-based magnetic biochar comprises the following steps:

[0019] 1) The straw is cleaned, air-dried naturally, oven-dried, crushed and sieved; in the cleaning process, the straw is cleaned with deionized water until the adhesion on the surface of the straw is cleaned; the natural air-drying time is 36~ 72h, the natural air-drying temperature is 25~30°C; the oven drying time is 12~36h, and the drying temperature is 70~80°C; the crushed straw is passed through a sieve of 80~120 mesh to obtain rice straw powder;

[0020] 2) Take the rice straw powder prepared in step 1) and place it in a muffle furnace for pre-carbonization. The pre-carbonization temperature is 450-550 ° C, and the carbonization time is 5-7 hours. After cooling to room temperature in the muffle furnace, take it out to obtain For the pre-carbonized product, soak the prepared pre-carbonized product with HCl solution with a concentration of 0.5~1.5mol / L for 10~20h, and the crushe...

Embodiment 2

[0028] The preparation method of straw-based magnetic biochar comprises the following steps:

[0029] 1) The straw was cleaned, air-dried naturally, oven-dried, crushed and sieved; during the cleaning process, the straw was washed 4 times with deionized water, and the adhesions on the surface of the straw were cleaned; the natural air-drying time was 48 hours, The natural air-drying temperature is 25-30°C; the oven drying time is 24 hours, and the drying temperature is 70-80°C; the crushed straw is passed through a 40-mesh sieve to obtain straw powder;

[0030] 2) Take the rice straw powder with a particle size of 0.154mm in step 1) and place it in a muffle furnace for pre-carbonization. The pre-carbonization temperature is 500°C and the carbonization time is 6h. After cooling to room temperature in the muffle furnace, take it out to obtain pre-carbonization. The product is soaked in the HCl solution with a concentration of 1mol / L for 12 hours, filtered, washed with deionized ...

Embodiment 3

[0038] The preparation method of straw-based magnetic biochar comprises the following steps:

[0039] 1) The straw is cleaned, air-dried naturally, oven-dried, crushed and sieved; in the cleaning process, the straw is cleaned with deionized water until the adhesion on the surface of the straw is cleaned; the natural air-drying time is 36~ 72h, the natural air-drying temperature is 25~30°C; the oven drying time is 12~36h, and the drying temperature is 70~80°C; the crushed straw is passed through a sieve of 80~120 mesh to obtain rice straw powder;

[0040] 2) Take the rice straw powder prepared in step 1) and place it in a muffle furnace for pre-carbonization. The pre-carbonization temperature is 450°C and the carbonization time is 5h. After cooling to room temperature in the muffle furnace, take it out to obtain a pre-carbonized product. Soak the prepared pre-carbonized product in HCl solution with a concentration of 0.5mol / L for 10 hours, filter it, wash it with deionized wate...

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Abstract

The invention provides a preparation method of straw-based magnetic charcoal. The method includes the following steps that (1) straw is cleaned, naturally air-dried, dried in a drying oven, smashed and sieved, and straw powder is obtained; (2) the straw powder is pre-carbonized in a muffle furnace, washed and dried, and a straw-based pre-carbonized product is obtained; (3) the straw-based pre-carbonized product is put in a tube furnace, argon is fed, pyrolysis is performed at the temperature of 400-500 DEG C for 2-3 hours, cooling is performed till the temperature reaches the room temperature,washing is performed till the product is neutral, drying and grinding are performed, then sieving is performed, and straw-based charcoal is obtained; and (4) the straw-based charcoal and oleylamine are put in a reaction kettle for uniform mixing and ultrasound treatment, ferric acetylacetonate is added into a mixed solution, the mixed solution is stirred uniformly, a liquid product is obtained, ablack substance is separated out after centrifugation is finished, and the straw-based magnetic charcoal is obtained. Compared with original charcoal, the prepared straw-based magnetic charcoal has the advantages of being better in thermal stability and larger in specific surface area, and medium and large pores in the pore structure of the straw-based magnetic charcoal prevail.

Description

technical field [0001] The invention relates to the technical field of biochar and the preparation of biochar, in particular to a method for preparing rice straw-based magnetic biochar. Background technique [0002] Biochar is the product of carbonization of plants through pyrolysis under low-oxygen or oxygen-free environment. Biochar provides solutions to problems such as bioenergy production, soil improvement, fertilizer innovation, greenhouse gas emission reduction, and utilization of waste biomass resources. Porous carbon represented by biochar is widely used in chemical, environmental protection, catalytic reaction, biological separation, clean production, etc. field. The traditional recovery method mainly adopts filtration. Due to the small particle size of porous carbon, it is difficult to separate and recover when it is used in water treatment, which is likely to cause waste of resources and secondary pollution. Compared with this, magnetic separation technology ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C10B53/02B01J20/30B01J20/28
CPCY02E50/10Y02E50/30
Inventor 田龙褚学英宋肖肖冯梦杰梁志林赵孟霞王秋贝
Owner NANYANG NORMAL UNIV
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