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A kind of method for preparing humic acid urea complex in aqueous medium

A humic acid urea and complex technology, which is applied in the direction of fertilizer mixture, fertilization device, application, etc., can solve the problems of difficult to realize large-scale industrial production, long production process, increased production cost, etc., and achieve easy continuous industrial operation, The production equipment is easy to operate and the effect of reducing physical labor

Active Publication Date: 2011-11-30
谭钧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses pure humic acid as the production raw material, not only the production process is long, the operation is troublesome, but also the production cost is increased, and it is difficult to realize large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Get 200.0 parts of water in the reactor, add 48.0 parts of urea, after stirring and dissolving at about 55°C, add 80.0 parts of Inner Mongolia Wuchuan weathered lignite containing 69% (dry basis) of humic acid and 28% of water, and heat up to React at about 95°C for 10 minutes, add 8.0 parts of diammonium phosphate, continue to stir and react for 45 minutes, separate the solid and liquid, and dry the solution to obtain 71.0 parts of solid humic acid urea complex, the extraction rate of humic acid is 70%, and the content of humic acid is 28.0 Parts, water-soluble humic acid 47%, nitrogen 30%, humic acid urea complex 1% aqueous solution pH=5.7.

Embodiment 2

[0017] Embodiment 2: Get 200.0 parts of water in the reactor, add 40.0 parts of urea, after stirring and dissolving at about 55°C, add 80.0 parts of Inner Mongolia Wuchuan weathered lignite containing 44% (dry basis) of humic acid and 26.5% of water, and heat up to React at about 95°C for 10 minutes, add 8.0 parts of diammonium phosphate, continue to stir and react for 50 minutes, separate the solid from the liquid, and dry the solution to obtain 59.0 parts of solid humic acid urea, the extraction rate of humic acid is 72%, and it contains 18.7 parts of humic acid. 38% humic acid, 28% nitrogen, 1% aqueous solution of humic acid urea complex pH=5.5.

Embodiment 3

[0018] Example 3: Get 200.0 parts of water in the reactor, add 80.0 parts of urea, stir and dissolve at about 58°C, add 80.0 parts of Inner Mongolia Wuhai weathered coal containing 70% humic acid (dry basis) and 20% water, and heat up React at about 90°C for 10 minutes, add 8.0 parts of diammonium phosphate, continue to stir and react for 55 minutes, separate the solid from the liquid, and dry the solution to obtain 84 parts of solid humic acid urea, the extraction rate of humic acid is 49%, and it contains 22.0 parts of humic acid. Water-soluble humic acid 29%, nitrogen 35%, humic acid urea complex 1% aqueous solution pH=5.4.

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Abstract

The invention provides a method for preparing a humic acid-urea complex in an aqueous medium, which comprises the following steps of: dissolving 20 to 400 parts of urea in 40 to 200 parts of water at the temperature of between 20 and 60DEG C; adding 40 to 200 pars of humic acid feed coal, heating to the temperature of between 40 and 100DEG C, and reacting for 5 to 30 minutes; adding 10 to 100 parts of phosphate, continuously stirring, reacting for 30 to 120 minutes, and performing solid-liquid separation; and evaporating and concentrating a solution to obtain concentrated liquor of the humic acid-urea complex, or drying to obtain a solid humic acid-urea complex. The method has the advantages that: the phosphate is used as an activator, and the extraction ratio of water-soluble humic acid is improved; the used humic acid feed coal is rich in resources, low in price and easily obtained; the production process has a simple and short flow, the equipment is easy and convenient to operate, reaction conditions are mild, pollutant emission is avoided in the production process, environmental pollution is avoided, and the method is suitable for large-scale industrial production; and the product has good water solubility and can effectively improve the fertilizer efficiency of urea and the utilization rate of nitrogen.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, in particular to a method for preparing a humic acid-urea complex by reacting humic acid raw material coal with urea in an aqueous medium. Background technique [0002] Urea is a fertilizer with high nitrogen content and the largest amount used in agricultural production. However, urea can be quickly decomposed into ammonium nitrogen under the action of urease. Relatively low (only 30-35%), pollute the environment simultaneously. In the sixties of the twentieth century, domestic and foreign just paid attention to making urea into a slow-release and controlled-release fertilizer. There are many literature reports on this aspect, which can be summarized as follows: The first is the urease inhibition method, adding a urease inhibitor to the urea melt or nitrification inhibitors; the second is the coating coating method, coating materials include sulfur powder, resin, plastic, aspha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 谭钧王丽霞白凤华赵世军董钰邢文军张鸿云乌日娜
Owner 谭钧
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