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Production process of high tower melt-granulated compound fertilizer

A technology of melt granulation and production process, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, potash fertilizer, etc. It can solve the problems of difficult production process control, increased production of biuret, and poor product appearance quality, so as to improve the appearance quality , the amount of solid phase is reduced, and the effect of improving the fluidity of the slurry

Inactive Publication Date: 2013-07-03
河南财鑫实业化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Since there is no drying process in the high-tower process, it is required that the molten urea cannot be added with water, the steam consumption is high, and the cost is relatively high;
[0005] 2. Due to the high melting temperature of urea, it is required to develop larger urea melting equipment to improve the production capacity of high towers. Due to the limitation of urea melting equipment, many manufacturers have a low output level;
[0006] 3. The high melting temperature of urea and the bulky equipment have resulted in an increase in biuret production. Some manufacturers have biuret exceeding 1.5%, and the damage to crops cannot be ignored;
[0007] 4. The fluidity of some formula slurry is poor, the production process is difficult to control, and the operation is unstable;
[0008] 5. During the production of high-nitrogen formula, due to the large proportion of urine and high temperature, the slurry temperature is high, and the product appearance quality is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The 28-6-6 formula is produced in the high-tower production line, and the theoretical formula (weight %) is 58% of urea, 10% of potassium chloride, 13.5% of monoammonium phosphate, and 18.5% of dolomite powder. Potassium chloride is divided into two places and enters the system, wherein 5% potassium chloride and 58% urea are mixed into the urea melting tank (some are on the tower, and some producers are under the tower), (potassium chloride: urea=1: 11.6), the temperature is controlled at 120 ~ 125 ° C, and then sent to the mixing tank;

[0025] Potassium chloride, monoammonium phosphate, filling materials and other solid materials are screened to remove sundries and lumps, and then sent to the mixing tank after weighing 5% potassium chloride, 13.5% monoammonium phosphate, and 18.5% dolomite powder according to the proportion of ingredients ; The liquid-solid ratio in the mixing tank is increased from 58:42 to 63:37;

[0026] The powder material, urea and potassium chl...

Embodiment 2

[0030] The 28-6-6 formula is produced in the high-tower production line, and the theoretical formula (weight %) is 60% of urea, 10% of potassium chloride, 15% of monoammonium phosphate, and 15% of dolomite powder.

[0031] Wherein 4% potassium chloride is mixed with 60% urea and enters the urea melting tank (potassium chloride: urea=1: 15), and the temperature is controlled at 120° C., and then sent into the mixing tank.

[0032] The remaining solid materials such as potassium chloride, monoammonium phosphate, and dolomite powder are screened to remove impurities and lumps, and then sent to the mixing tank.

[0033] All the other steps are the same as in Example 1.

Embodiment 3

[0035] The 28-6-6 formula is produced in the high-tower production line, and the theoretical formula (weight %) is 60% of urea, 12% of potassium chloride, 12% of monoammonium phosphate, and 16% of dolomite powder.

[0036] Wherein 5% potassium chloride is mixed with 60% urea and enters the urea melting tank (potassium chloride: urea=1: 10), temperature is controlled at 125 ℃, sends into mixing tank thereafter.

[0037] The remaining solid materials such as potassium chloride, monoammonium phosphate, and dolomite powder are screened to remove impurities and lumps, and then sent to the mixing tank.

[0038] All the other steps are the same as in Example 1.

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PUM

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Abstract

The invention relates to a production process of a high tower melt-granulated compound fertilizer. Potassium chloride is added in the process of melting urea, and the temperatures of urine and slurry are reduced according to a characteristic that the melting temperature is reduced after the urea is mixed with the potassium chloride serving as a cosolvent. The liquid solid ratio of the slurry can be regulated so as to reduce the melting temperature of the urea, the melting capacity of urea melting equipment is improved, and the foundation for improving the yield is laid.

Description

technical field [0001] The invention relates to a high-tower melt granulation compound fertilizer production process. Background technique [0002] The general process of high-tower granulation: urea is measured and melted to make urine and sent to the mixing tank. Potassium chloride, ammonium phosphate and filling materials are sent to the mixing tank after being measured and treated. The powder material and urine are mixed in the mixing tank. Stir and mix thoroughly, flow into the differential granulation nozzle by gravity, and throw the mixed slurry out of numerous small droplets by the centrifugal force of the high-speed rotation of the nozzle, and the small droplets contact with the rising air in the tower in the process of falling in the granulation tower Heat exchange, small liquid droplets gradually solidify from liquid to solid particles with the drop of temperature, after cooling, screening, anti-caking treatment, packaging is the finished product. [0003] There ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G5/00C05C9/00C05D1/02C05B7/00
Inventor 仵树仁李霄峰叶新友李现才田汉民王峰郝天才
Owner 河南财鑫实业化工有限责任公司
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