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Process for preparing seaweed urea

A technology of seaweed and urea, applied in botany equipment and methods, urea compound fertilizer, biocide, etc., can solve the problems of low fertilizer utilization rate, improve absorption rate and utilization rate, improve farmland ecological environment, and promote the formation of Effect

Active Publication Date: 2009-07-22
青岛海大生物集团股份有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and provide a preparation method of seaweed urea. Combining seaweed and urea can greatly improve the absorption and utilization rate of urea, and at the same time, it can also inhibit the rapid decomposition of urea components and slow down the loss. Effectively solve the problem of low fertilizer efficiency in urea fertilization

Method used

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preparation example Construction

[0016] The present invention is a kind of preparation method of seaweed urea, and concrete preparation method is as follows:

[0017] Firstly, the concentrated seaweed extract is prepared, and the seaweed is mainly kelp, enteromorpha, sargassum or macroalgae. Add 50 parts by weight of seaweed and 1000-1500 parts by weight of water into the extraction tank, then add 5-15 parts by weight of alkali (the alkali is sodium carbonate or potassium carbonate or potassium hydroxide), and gradually heat up to 60-80 degrees , keep warm for 1-2 hours, then turn on the stirring and continue to extract for 50-70 minutes. After the extraction is completed, open the opening valve to filter, and finally concentrate the filtrate in vacuum for 2-3 times. The concentrated seaweed extract contains seaweed oligosaccharides, plant Growth regulator, iodine, and medium and trace element nutrients, wherein the medium and trace elements are selected from calcium, magnesium, sulfur, copper, iron, manganes...

example 1

[0020] Take 30kg of kelp, add 800kg of water, then add 6kg of sodium carbonate, raise the temperature to 65°C, keep it warm for 2 hours, then turn on the stirring, continue stirring and extracting for 50-60 minutes. The extract is filtered and concentrated, and the concentrated seaweed extract is added before the granulation process of urea production. The weight ratio of the seaweed extract to urea is 15:100, and then granulated to obtain seaweed urea.

example 2

[0022] Take 30kg of Enteromorpha, add 800kg of water, then add 3kg of sodium hydroxide, raise the temperature to 70°C, keep it warm for 1.5 hours, then turn on the stirring, and continue stirring and extracting for 60 minutes. The extract is filtered and concentrated, and the concentrated seaweed extract is added before the granulation process of urea production. The weight ratio of the seaweed extract to urea is 10:100, and then granulated to obtain seaweed urea.

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Abstract

The invention provides a method for preparing seaweed urea. Firstly, a concentrated seaweed extract is prepared; during the prilling process of urea, the concentrated seaweed extract and a fused urea solution are evenly mixed, wherein, the weight proportion of the concentrated seaweed extract and the urea added is 50 to 200:1000; then prilling is conducted in a prilling tower to prepare seaweed urea products. After the prilling of the concentrated seaweed extract and the fused urea, the concentrated seaweed extract exists in the form of solid seaweed extract, wherein, the weight percentage of the solid seaweed extract in the seaweed urea is 0.5 percent to 2 percent and the weight percentage of the urea is 98 percent to 99.5 percent. The combination of seaweed and urea can greatly improve the absorption and utilization ratio of urea, and meanwhile has the function of restraining the fast decomposition of urea contents and slowing down loss, thus effectively solving the problem of soil deterioration in current fertilization.

Description

technical field [0001] The invention belongs to the technical field of urea production, in particular to a preparation method of seaweed urea. Background technique [0002] At present, my country's soil fertility focuses on the input of chemical fertilizers, while ignoring the use of organic fertilizers. my country accounts for 10% of the world's arable land but consumes 30% of the world's chemical fertilizers. The amount of chemical fertilizer input per unit of arable land is 2.8 times the world's average amount. Among them, the amount of nitrogen fertilizer ranks first among chemical fertilizers, and urea is the leader among nitrogen fertilizers. Its nitrogen content is as high as 46.8%, and it is the main fertilizer source for agriculture. But it is a unit quick-acting fertilizer after all, and its nitrogen utilization rate is low. According to research, its utilization rate is only about 36%. The serious situation that has appeared in our country is that the high level...

Claims

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Application Information

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IPC IPC(8): C05G3/08A01N65/00C05C9/00C05F11/10C05G3/80C05G3/90
Inventor 单俊伟王海华李秀珍
Owner 青岛海大生物集团股份有限公司
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