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Slow-release fertilizer wrapped in microalgae or algae residue and preparation method thereof

A technology of microalgae algae and slow-release fertilizers, applied in layered/coated fertilizers, organic fertilizers, fertilizer mixtures, etc., can solve problems such as refractory degradation and high cost, and achieve improved soil quality, improved economy, and improved mechanical resistance. powerful effect

Active Publication Date: 2021-06-01
湖南省耕天下生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high cost, refractory degradation, and secondary pollution caused by using inorganic or organic polymers as wrapping materials to produce slow-release fertilizers, thereby providing a method of using microalgae or extracting active ingredients. A low-cost and environmentally friendly slow-release fertilizer and a preparation method thereof, in which the algae residue is used as a wrapping material, specifically a slow-release fertilizer wrapped with microalgae or algae residue and a preparation method thereof

Method used

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  • Slow-release fertilizer wrapped in microalgae or algae residue and preparation method thereof
  • Slow-release fertilizer wrapped in microalgae or algae residue and preparation method thereof
  • Slow-release fertilizer wrapped in microalgae or algae residue and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The collected microalgae (the source is Taihu Lake blooms, mainly composed of Microcystis Microcystis aeruginosa ) Naturally air-dried to a water content of 5-10%, ground and pulverized into powder, and passed through a 60-mesh sieve. Prepare a polyvinyl alcohol aqueous solution with a mass concentration of 5%. Add 10 kg of urea granules into the disc granulator, start to rotate the disc, and spray the polyvinyl alcohol aqueous solution evenly on the surface of the granular fertilizer in the form of mist through the high-pressure nozzle. At the same time, the algae body powder is sprinkled into the disc, and the binder is continuously sprayed to wrap the powder on the outer layer of urea until 0.8 kg of the algae body powder is wrapped on the particles. Then dry the slow-release fertilizer after wrapping with hot air blower, until water content is lower than 5%, record algae wrap and account for 7.4% of the gross weight of described slow-release fertilizer, wrap slo...

Embodiment 2

[0029] Microalgae algae (sourced from waste water cultured Chlorella, Chlorella vulgaris ) After oil extraction, the algae residue is dried at 50°C until the water content is less than 5%, pulverized into powder in a ball mill, and passed through a 100-mesh sieve. A polyacrylamide solution with a mass fraction of 0.1% was configured as a binder. Start the fluidized bed, and add 10 kilograms of urea granules to it to make the urea fluidize stably in the bed. Spray the binder into the nozzle on the side wall of the fluidized bed at high pressure, and at the same time add the algae residue powder from the bottom of the fluidized bed to a final mass of 0.8 kg. Under the action of the binder, the algae residue evenly adheres to the outer layer of the particles At the same time, the hot air stream dries the wrapped slow-release fertilizer. When the water content is lower than 5%, it is considered that the wrapping is completed. It is measured that the algae residue coating account...

Embodiment 3

[0032] The microalgae (the source is artificial cultured spirulina, Spirulina maxima) The algae residue after protein extraction is dried at 50°C until the water content is less than 5%, pulverized into powder in a Raymond mill, and passed through a 150-mesh sieve. The PEG4000 aqueous solution with a mass fraction of 3% was configured as a binder. Add 10 kg of urea granules into the disc granulator, start to rotate the disc, and spray the binder evenly on the surface of the granular fertilizer in the form of mist through the high-pressure nozzle. At the same time, the algae residue powder is sprinkled into the disk, and the binder is continuously sprayed to wrap the powder on the outer layer of urea until 0.8 kg of the algae residue powder is wrapped on the particles. Then dry the slow-release fertilizer after wrapping with hot air blower, until water content is lower than 5%, record that algae dregs wrapping layer accounts for 7.7% of the gross weight of described slow-rele...

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Abstract

The invention discloses a slow-release fertilizer wrapped with microalgae or algae dregs and a preparation method thereof. The slow-release fertilizer wrapped in microalgae or algae dregs is a slow-release fertilizer with compound fertilizer granules or elemental granule fertilizer as the core, and the outer layer wraps microalgae algae cells or algae dregs, wherein the microalgae algae Or the water content of the algae residue is 5-10%; and the microalgae algae or the algae residue coating account for 5-15% of the total weight of the slow-release fertilizer. Under the action of the binder, the algae cells or algae residue are evenly wrapped on the surface of the granular fertilizer, forming a physical barrier, delaying the release rate of nutrients, and improving the absorption and utilization rate.

Description

technical field [0001] The invention belongs to the field of biological materials, and in particular relates to a slow-release fertilizer wrapped in microalgae or algae dregs and a preparation method thereof. Background technique [0002] Fertilizer is one of the elements of agricultural production and plays a pivotal role. my country's fertilizer production and consumption ranks first in the world. However, the utilization rate of fertilizer is low and the pollution is very serious. Slow-release fertilizer is a new type of fertilizer that can ensure the nutrient supply of crops and improve the utilization rate of nutrients. It is also the development trend of the fertilizer industry. Among them, the packaged slow-release fertilizer has developed rapidly in recent years, accounting for more than 95% of the total slow-release fertilizer. . The packaged slow-release fertilizer is based on granular fertilizer, and the surface layer is coated with one or more layers of low wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/40C05G3/80C05G5/30
CPCC05C9/00C05G3/00C05G3/80C05G5/30C05F11/00C05F11/08
Inventor 孙中亮孙利芹殷军港
Owner 湖南省耕天下生物科技有限公司
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