Controlled-release zinc fertilizer and preparation method thereof

A zinc fertilizer and core fertilizer technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of easy loss of coating slow/controlled release, expensive organic zinc, and increased fertilizer costs, so as to meet crop absorption Requirements, long effective time, long nutrient release effect

Active Publication Date: 2012-11-14
菏泽金正大生态工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their common shortcomings are that organic zinc is expensive, which increases the cost of fertilizers; the membrane shell

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  • Controlled-release zinc fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A controlled-release zinc fertilizer, the raw material composition of the core fertilizer is: 600 kg of zinc sulfate heptahydrate, 150 kg of weathered coal, 200 kg of urea, and 50 kg of bentonite. The inner sulfur coating accounts for 12wt% of the core fertilizer mass; the amount of the outer coating modified epoxy resin coating accounts for 2wt%, 3wt%, and 4wt% of the core fertilizer mass respectively. It is obtained by mixing at a mass ratio of 1:1:1.

[0047] Preparation method, the steps are as follows:

[0048] (1) According to the ratio, take 600 kg of zinc sulfate heptahydrate, 150 kg of weathered coal, 200 kg of urea, and 50 kg of bentonite, mix them evenly, and granulate them with a drum to prepare a granular fertilizer with a particle size of 2-3 mm to obtain the core Fat.

[0049] (2) Take 449 kg of epoxy resin E-4, 1 kg of polyurethane (PUR), mix well, add 1 kg of curing agent T-593, 1.5 kg of diluent benzyl glycidyl ether and 0.1 kg of corn starch, and mi...

Embodiment 2

[0056] A controlled-release zinc fertilizer, the raw material composition of the core fertilizer is: 500 kg of zinc sulfate heptahydrate, 200 kg of weathered coal, 240 kg of urea, and 60 kg of bentonite.

[0057] Preparation method, as described in Example 1, the difference is:

[0058] (1) Take 500 kg of zinc sulfate heptahydrate, 200 kg of weathered coal, 240 kg of urea, and 60 kg of bentonite, mix them evenly, and granulate them with a drum to prepare a granular fertilizer with a particle size of 2-3 mm to obtain core fertilizer.

[0059] (2) The modified epoxy resin coating agent is the same as in Example 1.

[0060] (3) Take 180 kg of core zinc fertilizer prepared in step (1), preheat to 80°C in the preheating container, transfer the fertilizer to the drum, and spray molten sulfur into the drum through the nozzle to continuously On the rotating fertilizer particles, a sulfur film is formed, and the mass of the sulfur film accounts for 15wt% of the core fertilizer mass, s...

Embodiment 3

[0064] A controlled-release zinc fertilizer raw material composition is: 700 kg of zinc sulfate heptahydrate, 100 kg of weathered coal, 130 kg of urea, and 70 kg of bentonite.

[0065] The preparation method is:

[0066] (1) According to the ratio, take 700 kg of zinc sulfate heptahydrate, 100 kg of weathered coal, 130 kg of urea, and 70 kg of bentonite, mix them evenly, and granulate them with a drum to prepare a granular fertilizer with a particle size of 2-3 mm to obtain core zinc Fat.

[0067] (2) The modified epoxy resin coating agent is the same as in Example 1.

[0068] (3) Take 240 kg of the core zinc fertilizer prepared in step (1), preheat it to 75°C in the preheating container, transfer the fertilizer to the drum, and spray molten sulfur into the drum through the nozzle to keep rotating On the fertilizer particles, a sulfur film is formed, and the mass of the sulfur film accounts for 10wt% of the core fertilizer mass, and the sulfur-zinc fertilizer is obtained.

...

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Abstract

The invention relates to a controlled-release zinc fertilizer and a preparation method thereof. As for the controlled-release zinc fertilizer provided by the invention, the zinc sulfate heptahydrate, weathered coal, urea and bentonite are compounded and granulated to form a core zinc fertilizer; then the core zinc fertilizer is enveloped by the molten sulfur; finally, the zinc/sulfur-coated fertilizer is further enveloped by the modified epoxy resin material to obtain three kinds of two-layer enveloped zinc fertilizer with different envelope thicknesses; and moreover, the zinc fertilizer with different envelop thicknesses is subjected to secondary compounding so that the nutrient release time of the produced controlled-release zinc fertilizer in soil is long, the release speed is uniform, and the needs of the crops in one year can be met by once application.

Description

technical field [0001] The invention relates to a controlled-release zinc fertilizer and a preparation method thereof, belonging to the technical field of production and application of controlled-release fertilizers. Background technique [0002] Zinc is not only an essential nutrient element for plant growth and development, but also an essential nutrient element for the human body. Increasing zinc content in crops is an important way to improve zinc nutrition in humans. However, the availability of zinc in the soil to crops is affected by many factors, resulting in insufficient zinc nutrition and a large area of ​​zinc deficiency. According to the survey, zinc deficiency is found in soils all over the country, especially in the north. The percentage of soil available zinc content in northeast, north and northwest regions below the critical value (2 micrograms of zinc / kg of soil) is 71.1%. Therefore, the application of zinc fertilizer is one of the effective measures to i...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 高义武高志光吴晓清
Owner 菏泽金正大生态工程有限公司
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