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Efficient environmental-friendly slow-release fertilizer and preparation method thereof

A slow-release fertilizer, an environmentally friendly technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problem of weak research on key equipment and process support, less research on slow and controlled release of nutrients such as phosphorus and potassium, and it is difficult to form large-scale industrialization. and other problems, to achieve the effect of reducing agricultural non-point source pollution, simplifying fertilization operations, and obtaining easy access.

Active Publication Date: 2011-04-06
CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of coated (wrapped) slow-release fertilizer is complicated, the production capacity is low, and the manufacturing cost remains high. It is only used in the production of flowers, vegetables, and turf with high economic value, and it is difficult to popularize and apply it to field crops. However, the cost of using non-coated slow-release fertilizers with added inhibitors is not high, but the effect of controlled-release nutrients is not stable.
[0005] (2) Slow release of nutrients
At present, many slow-release fertilizers on the market mainly focus on nitrogen nutrients, and there are few studies on the slow-controlled release of nutrients such as phosphorus and potassium.
[0006] (3) Industrialization issues
At present, the production process of slow-release fertilizers produced by biological methods is simple, and industrialization has basically been realized, while the production process of coated slow-release fertilizers is more complicated than traditional fertilizer processes, and the requirements for nutrient control are relatively high. The research on key equipment and supporting processes is relatively weak. Difficult to form large-scale industrialization

Method used

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  • Efficient environmental-friendly slow-release fertilizer and preparation method thereof
  • Efficient environmental-friendly slow-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Total nutrient (N+P 2 O 5 +K 2 O) ≥42%, the specification is 22-8-12 (chlorine) high-efficiency environmentally friendly slow-release compound fertilizer, the specific process steps are as follows:

[0032] (1) Weigh 18.73kg potassium chloride (including K 2 O-60.0%), 16.95kg monoammonium phosphate (containing N-11.0%, containing P 2 O 5 -44.0%), 10.70kg ammonium chloride (containing N-23.5%), 33.89kg urea (containing N-46.2%), 4.46kg bentonite, 0.27kg polyacrylamide, 0.02kg lemon yellow, crush and mix the above raw materials Evenly, the mixture is obtained and sent to the ammoniating drum granulator;

[0033] (2) Spray 2.41kg of liquid ammonia, 2.32kg of 60% dilute sulfuric acid, and 6.24kg of 3% polyvinyl alcohol aqueous solution on the above mixture in the granulator;

[0034] (3) Two-stage drying, semi-cooling and coarse and fine sieving are adopted. After sieving, particles with a particle size of 2.0-4.5mm enter the special coating machine, large particles larger than 4....

Embodiment 2

[0038] Total nutrient (N+P 2 O 5 +K 2 O) ≥42%, the specification is 16-10-16 (potassium sulfate type) high-efficiency environmentally friendly slow-release compound fertilizer. The specific process steps are as follows:

[0039] (1) Measure 29.58kg potassium sulfate (including K 2 O-50.0%), 21.30kg monoammonium phosphate (containing N-11.0%, containing P 2 O 5 -44.0%), 3.55kg ammonium sulfate (containing N-20.5%), 24.25kg urea (containing N-46.2%), 7.10kg bentonite, 0.06kg polyacrylamide, 0.03kg light fast yellow, crush and mix the above raw materials Evenly, the mixture is obtained and sent to the ammoniating drum granulator;

[0040] (2) Spray 2.07kg of liquid ammonia, 2.07kg of dilute sulfuric acid (60% by mass), and 7.10kg of polyvinyl alcohol aqueous solution (2% by mass) to the above mixture in the granulator;

[0041] (3) Two-stage drying, semi-cooling and coarse and fine sieving are adopted. After sieving, particles with a particle size of 2.0-4.5mm enter the special coating ...

Embodiment 3

[0045] Total nutrient (N+P 2 O 5 +K 2 O) ≥37%, the specification is 27-0-10 (chlorine) high-efficiency environmentally friendly slow-release compound fertilizer, the specific process steps are as follows:

[0046] (1) Measure 15.34kg potassium chloride (containing K2O-60.0%), 14.25kg ammonium chloride (containing N-23.5%), 47.13kg urea (containing N-46.2%), 9.86kg bentonite, 0.11kg polypropylene Amide, 0.04kg permanent red, crush and mix the above raw materials uniformly to obtain the mixed material, and send it to the ammoniating drum granulator;

[0047] (2) Spray 1.97kg of liquid ammonia, 2.19kg of dilute sulfuric acid (60% by mass) and 4.38kg of polyvinyl alcohol aqueous solution (4% by mass) to the above mixture in the granulator;

[0048] (3) Two-stage drying, semi-cooling and coarse and fine sieving are adopted. After sieving, particles with a particle size of 2.0-4.5mm enter the special coating machine, large particles larger than 4.5mm are returned to crush, and fine particl...

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Abstract

The invention discloses efficient environmental-friendly slow-release fertilizer and a preparation method thereof. The fertilizer comprises the following components in parts by weight: 75-88 parts of chemical fertilizer raw material, 10-20 parts of endoplasmic slow-release material, 2-10 parts of enveloping slow-release material and 0.02-0.05 part of colorant. The preparation method comprises thefollowing steps of: after metering, crushing and uniformly mixing the chemical fertilizer raw material, the colorant, bentonite and polyacrylamide, feeding into a rotary drum granulator; spraying a polyvinyl alcohol aqueous solution; after drying at two sections, carrying out half cooling, rough screening and fine screening, then feeding into a coating machine; sequentially spraying an oil type slow-release material and a powder type slow-release; and uniformly mixing fully, cooling and packaging to obtain a finished product. The slow-release material of the invention can not cause soil pollution and improve the utilization ratio of the fertilizer, and the product has the advantages of color mark, simple process, low cost and high benefits and is convenient for recognition and operation.

Description

Technical field [0001] The invention relates to the technical field of fertilizers, in particular to a high-efficiency environment-friendly slow-release fertilizer and a preparation method thereof. Background technique [0002] China is a big agricultural country and the world's largest producer and consumer of fertilizers. my country uses 7% of the world's arable land to feed 22% of the world's population. Chemical fertilizers play a pivotal role in increasing my country's grain production. Fertilizer input accounts for about 50% of farmers' food production input. According to statistics from the Food and Agriculture Organization of the United Nations, the application of chemical fertilizers can increase the yield of grain crops by 55%-57% and the total output by 30%-31%. At present, the main problem in the application of chemical fertilizers is that most of the fertilizers used are ordinary quick-acting chemical fertilizers. In addition, unreasonable fertilization measures hav...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 罗斌谢中平束维正孙锡林陈勇樊荣琦郑兴来刘洪滨刘晓晖李莉
Owner CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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