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Azophoska and its preparing method

A nitrogen-phosphorus-potassium and fertilizer technology, which is applied to the field of preparation of the nitrogen-phosphorus-potassium fertilizer, can solve problems such as uneven fertilizer, and achieve the effects of good wear resistance, smooth appearance and uniform distribution of component content.

Inactive Publication Date: 2004-02-11
邸志刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if potassium nitrate is made into granules, when it is mixed with other granular phosphate fertilizers, the difference in the physical form of the two granules (particle size, sphericity, density, crushing strength, etc.) will inevitably cause the segregation of the mixture, resulting in the appearance of fertilizer uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: 13.3-0.9-45

[0024] 98% potassium nitrate and 2% double superphosphate (containing P 2 o 5 45%) heated to 330°C ~ 380°C (nitrogen oxides generated during the heating process are absorbed with sodium carbonate solution), stirred to form a melt or suspension, and granulated in a granulation tower at 340°C ~ 370°C , good hard spherical particles were obtained, and the content of nitrogen, phosphorus and potassium were 13.3%, 0.9% and 45% respectively. The crushing strength of 2-3mm particles is determined to be 2-4kg.

example 2

[0025] Example 2: 12.5-2-42

[0026] 90% potassium nitrate and 10% superphosphate (containing P 2 o 5 25%) heated to 330°C-380°C (the acidic substances in phosphate fertilizers are neutralized with powdered calcium oxide during the heating process), stirred to form its melt or suspension, and granulated at 340°C-370°C Granulating in the tower to obtain good hard spherical particles, the contents of nitrogen, phosphorus and potassium are 12.5%, 2% and 42% respectively. The crushing strength of 4-5mm particles was determined to be 8-13kg.

example 3

[0027] Example Three: 11-5-38

[0028] 83% potassium nitrate and 17% calcium sodium phosphate fertilizer (containing P 2 o 5 30%), heated to 330°C-380°C, stirred to form its melt or suspension, and granulated in a granulation tower at 340°C-370°C to obtain good hard spherical particles, nitrogen, phosphorus, potassium The contents are respectively 11%, 5%, and 38%. The crushing strength of 3-4mm particles was determined to be 4-5kg.

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PUM

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Abstract

The azophoska is prepared with potassium nitrate of 70-99 wt% and phosphate fertilizer ground into fine powder of 1-30 wt%, and through smelting at 330-380 deg.c, stirring to form melt or suspended matter, pelletizing at 340-370 deg.c in a pelletizing tower and sieving. The granulated azophoska contains nitrogen 10.0-13.7 % accounting in NN, potassium 32.0-47.0 % accounting in K2O and phosphorus0.3-15 % accounting in P2O5. The azophoska has excellent spherical appearance, smooth surface, high wear resistance and homogeneous components, and may be applied alone.

Description

technical field [0001] The invention relates to a phosphorus-containing NPK fertilizer, and also relates to a preparation method of the NPK fertilizer. Background technique [0002] Phosphorous, nitrogen, phosphorus, and potassium fertilizers based on potassium nitrate can be prepared by mixing potassium nitrate and phosphorus fertilizers, but simple mixing can hardly obtain a uniform fertilizer formula. At present, people have adopted various methods to obtain fertilizers with uniform composition, but these production methods always have different degrees of deficiencies in economy, environmental protection, and product quality, such as using a disc granulator to make potassium nitrate and phosphate fertilizer into granules The production process of nitrogen, phosphorus and potassium fertilizers needs to add water, binders and other additives, and also needs to return materials, heat drying, cooling and other processes, and the product particles are not high in sphericity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/02C05G1/00C05G5/00
Inventor 邸志刚
Owner 邸志刚