Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower

A control method and technology for compound fertilizers, which are applied to urea compound fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of reducing urea, particle blockage, and limited cooling range, so as to reduce the generation of biuret, save production costs, and reduce The effect of production energy consumption

Inactive Publication Date: 2012-10-03
徐州市芭田生态有限公司
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AI Technical Summary

Problems solved by technology

Potassium chloride and urea commonly used at present form a two-dimensional low-melting point system, and its melting point can be reduced to about 125°C, but the cooling range is limited; to achieve complete and uniform mixing of solid and liquid phases, it is necessary to ensure that the amount of liquid phase (the amount of urea) cannot Less than 35% (mass), too low liquid phase amount or granulation temperature is not conducive to the full mixing of molten urine and powder, causing insufficiently mixed particles to block the granulation nozzle and affect normal continuous production
[0004] There are also some manufacturers who directly use the molten urine from the urea plant to produce compound fertilizers. On the surface, it seems to reduce the secondary melting of urea and reduce the production of biuret, but because the urine from the urea plant is pure urea melt, The temperature is above the melting point of urea (132.7°C), and the long-distance pipeline transportation and the heating, pressure and heat preservation in the pipeline transportation process are creating conditions for the production of biuret. The compound fertilizer biuret produced by this method Higher content

Method used

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  • Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower
  • Method for controlling content of biuret in compound fertilizers for melt granulation in prilling tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] a) Transport 35kg of urea to the melting tank through the conveying equipment, and add 3kg of potassium chloride and 1kg of ammonium nitrate to form a eutectic system, and the material forms molten urine at 114°C; the melting tank is equipped with an automatic overflow device, continuous Production feed, when the liquid level exceeds a certain level, the molten urine will automatically overflow to the mixer;

[0040] b) Overflow the molten urine to the mixer, and add 2kg of ammonium chloride, 12kg of potassium sulfate, 30kg of dolomite powder, 16kg of monoammonium phosphate, and 1kg of trace elements (zinc sulfate, manganese sulfate mixture) to make it in the mixer , Pre-mixing at 102°C; the mixer is equipped with an automatic overflow device for continuous production, and when the liquid level exceeds a certain level, the slurry will automatically overflow to the emulsifier;

[0041] c) Flow the pre-mixed mixture into a constant temperature slurry emulsifier for emulsi...

Embodiment 2

[0047] a) Transport 25kg of urea to the melting tank through the conveying equipment, and add 3kg of potassium chloride, 0.5kg of ammonium nitrate and 0.5kg of water to form a eutectic system, and the materials form molten urine at 110°C;

[0048] b) Overflow the molten urine to the mixer, and add 20kg of potassium chloride, 40kg of dolomite powder, 10kg of monoammonium phosphate, and 1kg of trace elements (ferrous sulfate, ammonium molybdate mixture), make it in the mixer, in the Pre-mixed at 108°C;

[0049] c) Flow the pre-mixed mixture into a constant temperature slurry emulsifier for emulsification to obtain emulsified slurry;

[0050] d) Pass the emulsified slurry into the high tower granulator for spray granulation;

[0051] e) Collecting, cooling and sieving the compound fertilizer particles obtained in step d to obtain compound fertilizer.

[0052] The obtained compound fertilizer is a high tower melt granulation compound fertilizer containing 12.55% (mass) of nitrogen...

Embodiment 3

[0055] a) Transport 45kg of urea to the melting tank through conveying equipment, and add 4kg of ammonium chloride, 2kg of potassium chloride and 1kg of water to form a eutectic system, and the materials form molten urine at 108°C;

[0056] b) Overflow the molten urine to the mixer, and add 25kg of ammonium chloride, 5kg of ammonium sulfate, 5kg of potassium chloride, 12kg of monoammonium phosphate, and 1kg of trace elements (mixture of ferrous sulfate, borax, and ammonium molybdate) to make It is premixed in a mixer at 105°C;

[0057] c) Flow the pre-mixed mixture into a constant temperature slurry emulsifier for emulsification to obtain an emulsified slurry; the emulsification temperature is 105°C;

[0058] d) Pass the emulsified slurry into the high tower granulator for spray granulation; the granulation temperature is 105°C;

[0059] e) Collecting, cooling and sieving the compound fertilizer particles obtained in step d to obtain compound fertilizer.

[0060] The obtaine...

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Abstract

The invention provides a method for controlling the content of biuret in compound fertilizers for melt granulation in a prilling tower. A low melting point mixture is formed by urea and compounds in a melting tank, and is melted completely at the temperature ranging from 104 to 114 DEG C; nitrogen fertilizers, phosphate fertilizers, potash fertilizers, fillers and trace elements are used for melting urine and production compound fertilizers and are added in a mixer according to product demand ratios, are premixed rapidly under the temperature condition ranging from 90 to 110 DEG C, then are mixed through a slurry emulsifying machine at a high speed so as to form emulsified slurry, and then are processed through the procedures such as granulation, cooling sieving and the like in the prilling tower so as to produce the granular compound fertilizers with low content of biuret; in addition, the content of biuret in the compound fertilizers that are produced by adopting the method is less than 0.6 percent, the quality is safe, and fertilizer damages cannot be caused. The method belongs to a novel environment-friendly production method with low consumption, which can produce the granular compound fertilizers on the basis of urea-based prilling tower melt granulation technology.

Description

technical field [0001] The invention relates to a method for controlling the content of biuret in high tower melt granulation compound fertilizer. Background technique [0002] Urea-based high-tower melt granulation uses urea to melt as a liquid phase, which is mixed with other powdery materials to form a solid solution mixture system with good fluidity, which is sprayed into high-tower granulators to form high-tower compound fertilizers. Due to the physical and chemical properties of urea itself, it is easy to polycondense and form harmful substance biuret during its production melting and mixing process, and the national standard for compound fertilizer (composite fertilizer) (GB15063-2009) has no clear biuret index Biuret index is not a mandatory inspection item, so little attention has been paid to the control of biuret index, especially for compound fertilizers produced by high-tower melt granulation technology, the biuret content is higher than 1.0%, often There have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05C9/00
Inventor 潘有理廖威臧继国刘克学
Owner 徐州市芭田生态有限公司
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