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Humic acid urea and method for producing the same

A humic acid urea, humic acid technology, applied in urea compound fertilizer, organic fertilizer, nitrogen fertilizer and other directions, can solve the problems of not very obvious application effect, difficult mass production, promotion, unsightly appearance of products, etc., and achieve smooth and beautiful appearance. , full function, low production cost effect

Inactive Publication Date: 2009-05-13
王矛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The common feature of the above two kinds of humic acid urea products is that they use humic acid to wrap urea particles, so they both have the disadvantages of unsightly appearance and the outer layer of humic acid is easy to fall off. After using the above products, farmers’ hands become black and sticky. A lot of coal powder, very inconvenient to use
Secondly, because the humic acid used in the above two products is low-grade coal, the content of humic acid is low, the water solubility is poor, the absorption rate of crops is low, and the application effect is not very obvious
At the same time, the production cost of the above-mentioned products is high, and the production speed is slow, so it is difficult to produce and promote on a large scale.

Method used

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  • Humic acid urea and method for producing the same
  • Humic acid urea and method for producing the same
  • Humic acid urea and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put the peat containing humic acid into a disc granulator, add a small amount of water to rotate and granulate, and make spherical granules of 1-3 mm, and put them into the drum after drying. Put urea into the melter, feed high-temperature steam, melt into a liquid state at 130-140°C, control the outflow of molten urea solution through a flow meter, and spray and atomize the outflowing molten urea solution at a pressure of 0.5Mpa , sprayed on the surface of the rotating humic acid particles. As the temperature decreases, the molten urea liquid gradually solidifies on the humic acid particles, and the particles gradually become larger through rotation. After cooling, it is sieved into particles with a diameter of 1mm≤d≤2.5mm and 2.5mm≤d≤5mm, and is packaged to make a product. It has been determined that the product contains 25% nitrogen and 5% humic acid.

Embodiment 2

[0025] The weathered coal is ground to make powdered humic acid, which is treated with NaOH to form ammonium humate. Put it into a drum granulator, add a small amount of water to rotate and granulate, and dry it to make spherical particles with a particle diameter of 1-3 mm, and put it into the drum. Put urea into the melter, add water accounting for 3% of the weight of urea, pass in high-temperature steam, and melt it into a liquid state at 130-145°C, then add powdered ammonium sulfate accounting for 20% of the weight of urea, and wait until it is completely melted , the outflow of the molten urea mixture is controlled by a flow meter, and the mixture is atomized by a sprayer at a pressure of 0.5Mpa through a pressure pump, and then sprayed on the surface of the rotating humic acid particles. As the temperature decreases, the molten urea mixture gradually solidifies on the humic acid particles, and the particles gradually become larger through rotation to make humic acid urea...

Embodiment 3

[0027] Put the low-grade coal containing humic acid into the drum granulator, add a small amount of water to rotate and granulate, and make spherical particles of 1-3 mm, and put them into the drum after drying. Put urea into the melter, add water accounting for 2% of the weight of the urea, feed high-temperature steam, and melt it into a liquid state at 130-140°C, then add ammonium nitrate accounting for 10% of the weight of the urea, and after it is completely melted, pass The flow meter controls the outflow of the molten urea mixture, and the mixture is atomized by the sprayer at a pressure of 0.5Mpa through the pressure pump, and then sprayed on the surface of the rotating humic acid particles. As the temperature decreases, the molten urea mixture gradually solidifies on the humic acid particles, and the particles gradually become larger through rotation to make humic acid urea particles. After cooling, sieve to obtain particles with diameters of 1mm≤d≤2.5mm and 2.5mm≤d≤5m...

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Abstract

The invention provides humic acid urea. At a temperature of between 70 and 150 DEG C, the urea is heated and melted to be liquid state, sprayed on the surface of humic acid particles rotating in a rotating drum at a pressure of between 0.4 and 0.6MPa, and cooled down to be prepared into the urea-coated humic acid type humic acid urea. The outer part of the humic acid urea is hard shell formed by the urea or the mixture mainly comprising the urea, and the nutritive substance which is humic acid is coated in the middle part of the humic acid urea, so that the humic acid urea has crystal-clear and pure white particle as well as smooth and beautiful appearance; moreover, no powder is existed in the humic acid urea, the nutritive substance does not fall off because the nutritive substance is embedded in the humic acid urea, and the appearance of the humic acid urea is beautiful.

Description

technical field [0001] The invention relates to a fertilizer, in particular to a packaged slow-release fertilizer, and also relates to a preparation method of the packaged slow-release fertilizer. Background technique [0002] Urea is the nitrogen fertilizer with the highest nitrogen content, the largest agricultural demand, and the widest application range. However, due to the action of soil urease and nitrifying bacteria, when urea is directly used alone, the decomposition and loss of urea are too fast, and the absorption and utilization of urea nitrogen by crops is very low, and the utilization rate is only about 35%, which not only causes economic losses, but also decomposes urea. The nitrates, nitrites, and nitrogen oxides formed by the conversion will also cause serious environmental pollution. [0003] In order to solve this problem, agricultural chemists from all over the world have conducted a lot of research and developed various slow-release fertilizer manufactur...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05F11/02C05C9/00
Inventor 王矛李毅
Owner 王矛
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