Novel method for preparing humic acid urea slow release fertilizer

A humic acid urea and slow-release fertilizer technology, which is applied in the direction of fertilizer mixture, fertilization device, application, etc., can solve the problems of large-scale industrial production and popularization and application, the inability to realize large-scale continuous production, long solid-liquid separation and settling time, etc. problems, to achieve the effect of easy large-scale industrial production and popularization and application, short production process and reduced equipment investment

Active Publication Date: 2011-08-17
谭钧
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  • Application Information

AI Technical Summary

Problems solved by technology

CN200610152445.X discloses the preparation method of humic acid urea, in the process of preparing humic acid urea with humic acid or humate and urea, adding alkaline solution and adhesive will inevitably cause the increase of product cost
CN 96108848.6 discloses a method for preparing humic acid urea with weathered coal and urea as raw materials and ammonia water as an activator. The defects in the method are: 1. the temperature is relatively high (90-105° C.) in the implementation process, and the added Ammonia water ha

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example 1: Take 200 parts of water into the reactor, add 40 parts of urea, stir and dissolve at about 55°C, add 80 parts of Inner Mongolia Wuchuan weathered lignite (30 mesh) containing 44% humic acid (dry basis) and 26.5% water , The temperature is raised to about 95°C for 10 minutes, 8 parts of diammonium phosphate are added, and the reaction is continued for 50 minutes with stirring. The solid-liquid separation is carried out. The clear liquid contains 14.3% of water-soluble humic acid and 9.2% of N. Evaporate and concentrate the clear liquid to obtain a humic acid-urea complex concentrate (containing water-soluble humic acid 20.4%, N 12.6%), and then dry the concentrated solution to obtain a solid humic acid-urea complex (containing water-soluble humic acid 38%) , Containing 28% N).

Example Embodiment

[0027] Example 2: Take 200 parts of water into the reactor, add 48 parts of urea, stir and dissolve at about 55°C, add 80 parts of Inner Mongolia Wuchuan weathered lignite (30 mesh) containing 69% humic acid (dry basis) and 28% water , The temperature is raised to about 95 ℃ and reacted for 10 minutes, 8 parts of diammonium phosphate are added, the reaction is continued for 45 minutes, cooling, solid-liquid separation, and the clear liquid is dried to obtain 71 parts of solid humic acid urea, containing 28 parts of humic acid, humic acid The acid extraction rate is 70%, containing 47% of water-soluble humic acid and 30% of N.

Example Embodiment

[0028] Example 3: Mix 25 parts of the humic acid urea complex concentrate prepared in Example 1 with 122 parts of 75% urea melt, and dry and granulate at an inlet temperature of 130°C and an outlet temperature of 50°C. Humic acid urea slow-release fertilizer. The product has been tested by NY 1106-2006 and GB 2441. The product composition is: moisture 3.1%, total nitrogen 43.1%, water-soluble humic acid 5.3%, pH value (1:250 times aqueous solution): 8.0 .

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Abstract

The invention provides a novel method for preparing a humic acid urea slow release fertilizer. The method comprises the following steps of: dissolving 20-400 parts of urea with 40-200 parts of water at the temperature of between 20 DEG C and 60 DEG C; reacting with 40-200 parts of the humic acid feed coal at the temperature of between 40 DEG C and 100 DEG C for 5-30 minutes; adding 0-100 parts ofphosphate; continually reacting for 30-120 minutes; separating solid from liquid; evaporating and concentrating to obtain a humic acid urea complex compound concentrated solution or drying to obtain a solid humic acid urea complex compound; reacting with a urea solution or melt water; and concentrating, drying and granulating to obtain the humic acid urea slow release fertilizer. In the novel method, the raw material resource is rich, has low cost, and is readily available; the production process flow is short, equipment is easy and convenient to operate, and the slow release fertilizer can be grafted to a mature urea production procedure and is easy for large-scale industrial production; a product has high water solubility and is attractive; and the decomposition speed of the urea in soil can be effectively restrained, and the fertilizer effect of urea and the utilization ratio of nitrogen can be improved.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, in particular to a new method for preparing slow-release urea for agriculture or humic acid urea slow-release fertilizer used as a special slow-release fertilizer substrate. Background technique [0002] With the rapid development of agricultural production and agricultural science and technology, my country's chemical fertilizer industry is also booming, and its fertilizer production and consumption both rank first in the world. In the past two years, the annual consumption of chemical fertilizers in my country has reached more than 50 million tons (pure conversion), and the consumption per thousand hectares of arable land has reached 366.5 tons, which is 3.5 times the world average level. For urea alone, the national output in 2009 reached 63 million tons (physical volume). Experts estimate that coal is the main raw material for 65% of my country's urea production, and coal is...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 谭钧王丽霞赵世军董钰邢文军张鸿云王鹏瑞
Owner 谭钧
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