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Permeation fusion method for preparing charcoal-based urea fertilizer

A biochar and urea-based technology, applied in the field of biomass resource utilization, can solve the problems of difficulty in combining chemical fertilizers and low strength of biomass charcoal fertilizers, and achieve the effects of easy adjustment and control, good carbonization effect, and good fluidity

Active Publication Date: 2018-01-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems that the current biomass charcoal fertilizer has low strength and is difficult to combine with chemical fertilizers, the object of the present invention is to provide a biochar-based urea fertilizer osmotic fusion fertilizer method

Method used

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  • Permeation fusion method for preparing charcoal-based urea fertilizer
  • Permeation fusion method for preparing charcoal-based urea fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 0.3g of biochar powder with a particle size of 0.075-0.1mm, and 0.2g of urea powder (ratio: 1.5:1) into the fertilizer tube with a diameter of 8mm and a closed bottom, and tap the tube to make the biochar The powder is in uniform contact with urea, and then the fertilizer tube is transferred to a vacuum oven, and the temperature is adjusted to 135°C. After preheating for 5 minutes, the temperature is raised to 140°C, 145°C, 150°C and 155°C respectively, and the reaction is 30, 25, and 20°C respectively. , Take it out after 15 minutes, cool it under the action of air at 25°C for 5 seconds and take it out to obtain biochar-based urea fertilizers with different melting reaction temperatures.

[0041] The above-mentioned biochar-based urea fertilizer was tested for compressive strength, and the compressive strengths were 72.91N, 207.5N, 98.45N and 86.67N, respectively.

Embodiment 2

[0043] Weigh 0.3g of biochar powder and 0.2g of urea powder (ratio: 1.5:1) with particle sizes of 0.125-0.18mm, 0.10-0.125mm and 0.075-0.1mm, respectively, and add them to the fertilization tube with a diameter of 8mm. In the fertilization tube with a closed bottom, tap the fertilization tube to make the biochar powder and urea evenly contact, then transfer the fertilization tube to a vacuum oven, adjust the temperature to 135°C, and raise the temperature to 155°C after preheating for 5 minutes. Take it out after 15 minutes, cool it under the action of air at 25°C for 5 seconds and take it out to obtain biochar-based urea fertilizers with different particle sizes of biochar powder.

[0044] The above-mentioned biochar-based urea fertilizer was tested for compressive strength, and the compressive strengths were 73.23N, 93.52N and 86.67N, respectively.

Embodiment 3

[0046] Weigh 0.3g of biochar powder with a particle size of 0.075-0.1mm, and 0.2g of urea powder (ratio: 1.5:1) into the fertilization tubes with diameters of 6mm, 8mm, 10mm, and 12mm, respectively, and the bottom is closed. Tap the fertilizer tube to make the biochar powder and urea contact evenly, then transfer the fertilizer tube to a vacuum oven, adjust the temperature to 135°C, preheat for 5 minutes and raise the temperature to 155°C respectively, take it out after 15 minutes of reaction, and put it at 25°C Cool for 5 seconds under the action of air and take it out to obtain biochar-based urea fertilizers with different particle diameters.

[0047] The above-mentioned biochar-based urea fertilizer was tested for compressive strength, and the compressive strengths were 55.61N, 86.67N, 97.47N and 89.75N, respectively.

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Abstract

The invention discloses a permeation fusion method for preparing a charcoal-based urea fertilizer. The method comprises the following steps: raw material preparation; permeation fusion of charcoal andurea; and rapid cooling for forming the fertilizer. The main fertilizer preparation method is characterized by preheating urea powder and charcoal powder, the temperature of a system of the urea powder and charcoal powder is controlled to reach a urea melting temperature in order to realize the complete permeation fusion of the molten urea and the charcoal powder, and the charcoal-based urea fertilizer is finally obtained through cooling. The method has the advantages of adaption to different charcoal kinds, easiness in adjustment and control of the ratio, high charcoal fertilizer shaping rate, moderate mechanical strength, high stability, easiness in combination with an existing urea production technology to realize in situ shaping, certain promotion application industry foundation, andwide prospect. The method can be well combined with an existing urea shaping device in situ during the preparation, so the shaping time is short, the efficiency is high, the shaped product contains asmall amount of water, the particle size of the product is convenient to regulate and control, and the strength of the product is 50 N or more.

Description

technical field [0001] The invention belongs to the field of biomass resource utilization / fertilizer technology, and in particular relates to a biochar-based urea fertilizer fertilization method through osmosis fusion. Background technique [0002] my country is a big consumer of chemical fertilizers. The total amount of fertilizer application is close to 1 / 3 of the world's total, but the utilization efficiency is only 33%. About 174,000 tons of nitrogen fertilizer applied to grain and vegetable crops are directly lost every year. Excessive and Nutrient loss caused by irrational application of chemical fertilizers has become one of the most important sources of agricultural non-point source pollution in China at this stage. Biochar has developed pore structure, large specific surface area and rich oxygen-containing active groups. When applied together with agricultural chemical fertilizers, it can not only improve the utilization efficiency of fertilizers, improve crop nutrit...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/00C05G3/80
Inventor 王明峰蒋恩臣任永志吕娟许细薇钟旋吴宇健
Owner SOUTH CHINA AGRI UNIV
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