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Method for directly preparing granular water-soluble fertilizer by using urea production intermediate

A granular urea technology, which is applied in urea compound fertilizers, inorganic fertilizers, nitrate fertilizers, etc., can solve the problems of easy caking of powdered water-soluble fertilizers, difficulty in fertilization operations, waste of energy, etc., to shorten product cooling time and facilitate Fertilization operation, effect of improving product quality

Inactive Publication Date: 2016-08-03
山东禹城瑞利源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is not difficult to see from the above process that the production of water-soluble fertilizers requires the raw materials to be crushed or the particles mixed, so it is inevitable to unpack and crush a large amount of urea raw materials, which will cause dust and waste energy; powdered water-soluble fertilizers still exist Disadvantages such as easy caking and difficult fertilization operation

Method used

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  • Method for directly preparing granular water-soluble fertilizer by using urea production intermediate
  • Method for directly preparing granular water-soluble fertilizer by using urea production intermediate
  • Method for directly preparing granular water-soluble fertilizer by using urea production intermediate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: the preparation of granular macroelement water-soluble fertilizer (middle element Ca+Mg type):

[0022] Add 64.5kg of tripotassium phosphate, 40.3kg of potassium dihydrogen phosphate, 40.3kg of potassium sulfate, 24.2kg of calcium nitrate, and 24.2kg of magnesium sulfate into 806.5kg of urea solution (temperature above 132.7°C) in batches to maintain the reaction temperature Above 132.7°C, stir evenly to make a slurry, then spray the slurry through a granulation nozzle, and use the urea tower to cool and granulate with natural air to obtain granular macroelement water-soluble fertilizer (medium element Ca+Mg type). The performance index is shown in Table 1, and the obtained product complies with the national standard.

[0023] Table 1 Product quality index of granular macroelement water-soluble fertilizer (moderate element Ca+Mg type)

[0024]

[0025]

Embodiment 2

[0026] Embodiment 2: the preparation of granular macroelement water-soluble fertilizer (middle element Ca type)

[0027] Add 78.4 kg of dipotassium hydrogen phosphate, 47.1 kg of potassium dihydrogen phosphate, 43.1 kg of potassium nitrate, and 47.1 kg of calcium nitrate into 784.3 kg of urea solution (temperature above 132.7°C) in batches, and maintain the reaction temperature above 132.7°C , stir evenly to make a slurry, then spray the slurry through a granulation nozzle, and use the urea tower to cool and granulate with natural air to obtain a granular macroelement water-soluble fertilizer (moderate element Ca type). The performance indicators are shown in Table 2. The obtained product conforms to the national standard.

[0028] Table 2 Product quality index of granular macroelement water-soluble fertilizer (moderate element Ca type)

[0029] project

Embodiment 3

[0030] Embodiment 3: the preparation of granular macroelement water-soluble fertilizer (middle element Mg type)

[0031] Add 200.0kg of tripotassium phosphate, 50.0kg of potassium dihydrogen phosphate, 100.0kg of potassium sulfate, 90.0kg of potassium nitrate, and 60.0kg of magnesium sulfate into 500.0kg of urea solution (temperature above 132.7°C) in batches to maintain the reaction temperature Above 132.7°C, stir evenly to make a slurry, then spray the slurry through a granulation nozzle, and use the urea tower for natural air cooling to granulate to obtain a granular macronutrient water-soluble fertilizer (middle element Mg type), performance indicators As shown in Table 3, the obtained product complies with the national standard.

[0032] Table 3 Product quality index of granular macroelement water-soluble fertilizer (middle element Mg type)

[0033] project

[0034] 6 kinds of trace elements Cu, Fe, Mn, Zn, B, Mo and macroelements N+P in granular macroelement ...

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Abstract

The invention discloses a method for directly preparing a granular water-soluble fertilizer by using a urea production intermediate. The method comprises the following steps: 1, taking a urea solution from a urea production line; 2, gradually adding a substance containing nitrogen, phosphorus and potassium secondary and trace elements to the urea solution in batches; 3, continuously stirring reaction raw materials until the reaction raw materials are uniform, and keeping the reaction temperature at 132.7DEG C or above to prepare a slurry; 4, granulating the slurry through a granulating nozzle; and 5, cooling obtained granules to room temperature in order to prepare the granular water-soluble fertilizer. The granular macroelement water-soluble fertilizer (secondary element type) and the granular macroelement water-soluble fertilizer (trace element type) can be prepared through the method by adding different ingredients.

Description

technical field [0001] The invention relates to the field of chemical fertilizers, in particular to a production method for directly preparing water-soluble fertilizers by using urea production intermediates. Background technique [0002] Water-soluble fertilizer is a kind of quick-acting fertilizer, which is characterized by good water solubility, no residue, can be completely dissolved in water, and can be directly absorbed and utilized by the roots and leaves of crops. The traditional production process of water-soluble fertilizer is: raw material crushing treatment (urea and other ingredients) → urea melting → adding ingredients → uniform mixing → granulation cooling → finished product. [0003] Patent 201510668079.X discloses a production process of water-soluble fertilizers. The steps include batching (raw material particles are mixed according to the ratio), raw material treatment (heating and melting), mixing (mixed reaction with phosphorus and potassium compounds), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/06
CPCC05B7/00C05C5/04C05C9/00C05D1/02C05D5/00C05C5/02C05D9/00C05D9/02
Inventor 苏银才田宝俊李庆财马传俊冯喜赵学民毕长青杜金顺
Owner 山东禹城瑞利源科技有限公司
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