Method for preparing granular compound fertilizer

A kind of compound fertilizer and granular technology, applied in the direction of fertilization device, fertilizer mixture, application, etc., can solve the problems of limited application, limited fertility, etc., and achieve the effect of high mechanical strength, convenient transportation and application

Active Publication Date: 2010-11-24
甘肃海瑞达生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this fertilizer does not contain conventional components such as phosphorus and potassium, and its fertility is limited, and it is not a granular fertilizer, so its application is also greatly restricted

Method used

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  • Method for preparing granular compound fertilizer
  • Method for preparing granular compound fertilizer
  • Method for preparing granular compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Preparation of water-absorbent resin

[0023] Add 3 parts of sodium alginate into the reactor, add 200 parts of distilled water to dissolve, add 26.7 parts of acrylic acid, then add 10.4 parts of sodium hydroxide for neutralization, then add 13.3 parts of acrylamide, 4 parts of humic acid, 0.4 parts Ammonium persulfate and 0.024 parts of N,N'-methylenebisacrylamide were stirred evenly, then heated to 75°C, and reacted for 3 hours. After the reaction, the product is dried, pulverized, and passed through a 110-mesh sieve to obtain a water-absorbent resin for use.

[0024] b. Preparation of Granular Compound Fertilizer

[0025] i. Crush 70 parts of attapulgite clay, 50 parts of urea and 50 parts of potassium dihydrogen phosphate, pass through a 150-mesh sieve, and mix well.

[0026] ii. Put 30 parts of urea granules with a diameter of 1-2mm in the disc granulator (Construction Research Institute of Xingyang City, Henan Province, model LZ25), spray atomized water to we...

Embodiment 2

[0031] Embodiment 2: The production conditions of the water-absorbent resin are the same as in Embodiment 1. Pulverize 60 parts of attapulgite clay, 60 parts of urea and 70 parts of potassium dihydrogen phosphate, pass through a 150-mesh sieve, mix evenly and add it in 9 times to a disc with 40 parts of granular urea with a particle size of 1-2mm , wrapped under the action of atomized water, so that the mixed powder is wrapped on the surface of granular urea. Next, 15 parts of sodium alginate powder passed through a 110-mesh sieve was added into the disc for rolling coating, and after the coating was completed, 5% calcium chloride aqueous solution was sprayed. Finally, 20 parts of the prepared water-absorbing resin powder are passed through a 110-mesh sieve, put into a disc for rolling coating, and dried to obtain a finished granular fertilizer with a particle size of 2.5-3.5 mm. The content of sodium alginate in the inner layer of the finished product is 9%, the amount of ca...

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Abstract

The invention relates to a method for preparing a granular compound fertilizer, which comprises the following steps of: rotating a disc granulator under the action of atomized water to wrap a mixture of attapulgite clay, urea and monopotassium phosphate on the outer layers of urea granules; adding sodium alginate powder into the disc granulator, rotating a disc to wrap the sodium alginate on the outer layer of the core of the fertilizer, spraying 5 percent aqueous solution of calcium chloride to perform cross linking with the sodium alginate, and taking the cross-linked sodium alginate as fertilizer inner layer envelopes; adding water-absorbing resin powder into the disc granulator, and rotating the disc to wrap the water-absorbing resin outside the fertilizer granules to form fertilizer outer layer envelopes; and drying the mixture to obtain the granular fertilizer. The granular compound fertilizer provides multiple nutrient elements for plants, and improves the sustained-release performance of the nutrient elements of the fertilizer. Meanwhile, the granular compound fertilizer has multiple functions of water absorption and retention, sustained release, soil regulation and the like through the combination of the fertilizer and the water-absorbing resin.

Description

technical field [0001] The invention belongs to agricultural slow-release fertilizers, and relates to fertilizer processing technology and synthesis of new materials. Background technique [0002] my country is a large agricultural country, and agriculture is the foundation of the national economy. The related chemical fertilizer industry and water resource utilization are the important material basis for modern agricultural production and development. However, for a long time, my country's fertilizer utilization rate is generally only 30-35%. The low fertilizer utilization rate not only causes huge economic losses, but also causes serious environmental pollution. On the other hand, drought and water shortage are also important factors restricting my country's agricultural development. In arid and semi-arid areas, water is scarce all the year round. Most of the rainwater in the rainy season is lost or evaporated, and irrigation water is often lost due to evaporation or inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 柳明珠倪博立吕少瑜谢丽华王艳芳牛爱珍马维忠
Owner 甘肃海瑞达生态环境科技有限公司
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