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Silicon compound coated slow release fertilizer and preparation method thereof

A technology of silicon compounds and slow-release fertilizers, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of difficult degradation of coating materials, unsatisfactory slow-release performance, poor mechanical resistance, etc., and achieve low cost and good durability Good grinding performance and strength

Inactive Publication Date: 2014-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] The purpose of the present invention is to overcome the disadvantages of high price, difficult degradation of coating material and secondary pollution after application when using resin-coated fertilizers in the prior art, and also overcome the unsatisfactory slow-release performance of sulfur and lignin-coated fertilizers, the resistance to Weakness of poor mechanical ability, thereby providing a low-cost and environmentally friendly wrapped slow-release fertilizer using natural silicon compounds as a wrapping material and natural wax as a sealant, and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Firstly, the medical stone is pulverized by a ball mill, sieved to obtain the medical stone with a particle size below 100 mesh, and an aqueous solution of polyacrylic acid having a mass concentration of 0.2 wt % is prepared. Add 200 kg of 45% compound fertilizer granules into the disc granulator, start to rotate the disc, and spray the polyacrylic acid solution evenly on the surface of the compound fertilizer granules in the form of mist through the high-pressure nozzle. At the same time, sprinkle powdered medical stones to adhere to the outer layer of the particles. Continuously spraying adhesive medical stone like this wraps on particle outer layer layer by layer, until 16 kilograms of medical stones (8wt% of core fertilizer) all wrap on the particle. Then dry the wrapped particles with a hot air blower until the water content of the fertilizer is 3.5 wt%.

[0054] Finally, after the palm wax is heated to 85°C and completely melted, it is sprayed at 3.5kg / cm by a hi...

Embodiment 2

[0056] The natural sand is added to a Raymond mill for crushing, and sieved with a 120-mesh sieve to obtain fine sand. Start the fan, and turn on the electric heating device of the air, and add 100 kg of large-grained urea into the fluidized bed to make the urea fluidize stably in the bed. Nozzles are installed around the side walls of the fluidized bed, and the prepared 0.5wt% polyacrylic acid solution is evenly sprayed onto the surface of the fluidized urea particles in the form of mist through the high-pressure nozzles. At the same time, fine sand is added from the bottom of the fluidized bed, and the fine sand is fluidized with the air flow, collides with urea in the bed and adheres to the outer layer of the particles. At the same time, the hot air stream dries the urea, and continues to spray the binder while wrapping 15 kg (15wt% of the core fertilizer) of fine sand on the urea and completely drying the particles.

[0057] Then use a heating tank to heat and melt the pi...

Embodiment 3

[0059] Firstly, the silica sand is pulverized with a ball mill, and then sieved to obtain silica sand powder with a particle size of 90 mesh or less. Start the fluidized bed, add 120 kg of potassium sulfate particles, and the particles start to be in a good fluidized state in the bed in the upward hot air. The 0.3wt% polyacrylic acid solution is evenly sprayed onto the surface of the fluidized core particles through the high-pressure gun on the side wall, and at the same time, the silica sand powder is fed into the fluidized bed by air flow, and the particles collide with the particles in the bed and adhere to the surface of the particles. Until 12kg of silica sand (10wt% of the core fertilizer) is fully coated on the granules.

[0060] Then heat the insect wax until it melts, after 3.5kg / cm 3 With a high-pressure spray gun, the wax is sprayed onto the surface of the fertilizer granules in the form of mist until 2.4 kg of insect wax (2wt% of the core fertilizer) completely se...

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Abstract

The invention relates to a natural silicon compound coated slow release fertilizer. The slow release fertilizer is prepared by adopting a natural silicon compound as a wrapper, adopting a disc granulation and fluidized bed method, bonding the wrapper to the surfaces of core fertilizer particles through a binder, and enclosing via spraying the external surface with molten wax. The silicon compound comprising Chinese medical stone, natural sands, silica sand and the like contains the silicon element essential to plants, has a density and a good strength, is wrapped on the fertilizer surface to form a compact coat layer, and the compact coat layer is enclosed by strongly lyophobic wax layer, so the slow release performance of a fertilizer is substantially enhanced. After the fertilizer is applied, nutrients are gradually released, natural wax can be completely degraded, and nutrient silicon can also be released by the silicon compound to meet the need of plants, so the secondary pollution problem of routine resin coated fertilizers is overcome. The slow release fertilizer has the advantages of good slow release performance, high hardness, good wear resistance, low cost and environmental protection, and can be widely applied to various plants comprising crops, vegetables, fruits, flowers and lawns.

Description

technical field [0001] The invention belongs to the technical field of coated slow-release fertilizers, in particular to a slow-release fertilizer coated with natural silicon compounds and a preparation method thereof. Background technique [0002] Fertilizer is one of the important means of production in agricultural production and plays a pivotal role in the agricultural field. my country is a big country in fertilizer production and consumption. According to the statistics of the National Bureau of Statistics, the total consumption of chemical fertilizers in my country in 2010 was 66.198 million tons, and the production and consumption of chemical fertilizers ranked first in the world. However, there is a big gap between my country's fertilizer use efficiency and developed countries. The following problems exist in the use of chemical fertilizers. [0003] (1) The fertilizer utilization rate is low and the pollution is very serious [0004] my country's arable land ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 张小勇莫海涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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