Heavy metal contaminated soil improving coated fertilizer and preparation method thereof

A technology that pollutes soil and heavy metals. It is applied to layered/coated fertilizers, organic fertilizers, and excreted fertilizers. It can solve the problems of low utilization rate of chemical fertilizers in the current season, delay the release cycle of fertilizers, and improve impact resistance and surface area. big effect

Inactive Publication Date: 2018-02-16
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the seasonal utilization rate of chemical fertilizers is low (at present, the seasonal utilization rate of nitrogen fertilizer in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%), which is far lower than Utilization level of developed countries in the world

Method used

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  • Heavy metal contaminated soil improving coated fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select soybean straw and crush it to a length less than 1 cm, put it in a pyrolysis furnace, control the temperature at 500°C, and pyrolyze it for 1 hour under anaerobic conditions, take out the prepared biochar after cooling, and crush it to a particle size of less than 200 head. The fresh vermicompost is air-dried and crushed until the particle size is less than 200 mesh. Screen 100kg of fertilizer granules with a diameter of 2-3mm, add them to the drum fluidized bed, and preheat them at 70°C. Add 7 kg of ammonium magnesium phosphate and 13 kg of palm oil into the reaction kettle and stir for 2 hours at 100° C. to obtain a homogenized coating. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 9kg of biochar powder and 16kg of vermicompost powder evenly, wrap them on the surface of the sprayed and homogenized fertilizer, cool, and dry to obtain a coated fertilizer S1 that can improve heavy metal-polluted soil.

Embodiment 2

[0027] Select soybean straw and crush it to a length less than 1 cm, put it in a pyrolysis furnace, control the temperature at 1000°C, and pyrolyze it for 1 hour under anaerobic conditions, take out the prepared biochar after cooling, and crush it to a particle size of less than 200 head. The fresh vermicompost is air-dried and crushed until the particle size is less than 200 mesh. Screen 100kg of fertilizer granules with a diameter of 3-4mm, add them to the drum fluidized bed, and preheat them at 85°C. Add 6 kg of ammonium magnesium phosphate and 17 kg of palm oil into the reaction kettle and stir for 2 hours at 120° C. to obtain a coated homogenate. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 12kg of biochar powder and 15kg of vermicompost powder evenly and wrap them on the surface of the fertilizer that has been sprayed with homogenate, cool and dry to obtain a coated fertilizer S2 that can improve heavy metal-contaminated soil.

Embodiment 3

[0029] Select soybean stalks to be crushed to a length of less than 1 cm, put them in a pyrolysis furnace, control the temperature at 1000 ° C, and pyrolyze them for 0.8 h under anaerobic conditions, take out the prepared biochar after cooling, and crush them to a particle size smaller than 200 mesh. The fresh vermicompost is air-dried and crushed until the particle size is less than 200 mesh. Screen 100kg of fertilizer granules with a diameter of 3-4mm, add them to the drum fluidized bed, and preheat them at 85°C. Add 8 kg of magnesium ammonium phosphate and 17 kg of palm oil into the reaction kettle and stir at 150° C. for 2 hours to obtain a homogenized coating. Spray the coated homogenate evenly onto the preheated fertilizer surface. Mix 10kg of biochar powder and 20kg of vermicompost powder evenly, wrap them on the surface of the fertilizer that has been sprayed with homogenate, cool, and dry to obtain a coated fertilizer S3 that can improve heavy metal-contaminated soi...

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Abstract

The invention discloses heavy metal contaminated soil improving coated fertilizer and a preparation method thereof. The preparation method includes the steps of 1), preheating fertilizer granules; 2),mixing ammonium magnesium phosphate with grease by blending to obtain coated slurry; 3), evenly spraying the coated slurry to surfaces of the fertilizer granules preheated in the step 1); 4), evenlymixing biochar powder with wormcast powder and coating the mixture on a product to obtain the coated fertilizer after performing cooling and drying. The surface of the fertilizer is coated with a layer of a film-forming material, heavy metals in the active state in soil can be passivated, pollution caused by the heavy metals to the ecosystem is reduced, and fattening release cycle of the fertilizer can be delayed; the prepared coated fertilizer meets requirements of the state for the coating fertilizer, the fertilizer is decomposed gradually under the action of chemical and biological factorsafter applied to the soil, nutrients are released slowly, and requirements of crops in the whole growing period on the nutrients can be met.

Description

technical field [0001] The invention belongs to the field of agricultural production, and more specifically relates to a coated fertilizer for improving heavy metal polluted soil and a preparation method thereof. Background technique [0002] Chemical fertilizers play an important role in agricultural production, and 50% of the increase in food production in developing countries comes from the role of chemical fertilizers. However, the seasonal utilization rate of chemical fertilizers is low (at present, the seasonal utilization rate of nitrogen fertilizer in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%), which is far lower than The utilization level of developed countries in the world. The survey shows that the rate of points exceeding the standard of cultivated land in our country is 19.4%, and some seriously polluted soils cannot be cultivated. [0003] In 2014, ...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05B7/00C05G3/00C05G3/80C05G5/30C05D9/00C05F3/00
Inventor 程群鹏李建芬李红霞宋光森张顺喜
Owner WUHAN POLYTECHNIC UNIVERSITY
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