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Method for improving granulation performance of urine-based fertilizer

A technology of granulation and performance, applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer form, etc., can solve the problems of not easy to bond and granulate, difficulty in process granulation, decrease of equipment capacity, etc., to increase the slow-release effect and reduce the return rate. The amount of material and the effect of improving the production capacity of the device

Inactive Publication Date: 2009-12-30
中国-阿拉伯化肥有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, when the nitrogen content in the finished urea-based fertilizer exceeds 20%, the process is difficult to granulate, and the production capacity of the device is greatly reduced. The main reason is that when the nitrogen content is high, a large amount of urea is needed in the raw material, and solid urea or urea melt lacks viscosity. , not easy to bond with other phosphorus and potassium fertilizers into granules

Method used

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  • Method for improving granulation performance of urine-based fertilizer
  • Method for improving granulation performance of urine-based fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Taking 24-05-10 urine base fertilizer as an example, the design capacity of the device is 40t / h. The original feed rate is 3.5t / h for liquid ammonia 5, 2.9t / h for phosphoric acid 2, 10.0t / h for sulfuric acid 3, 45.7t / h for washing liquid into tubular reactor 6, and 7.5t for urea melt 14. / h is directly passed into the granulator 7, mixed with the material 1 of the granulation circuit in the granulator 7, and bonded into granules.

[0035]Take sodium carboxymethyl cellulose as binding agent, prepare the binding agent solution containing 2% sodium carboxymethyl cellulose, 1% zinc stearate and 5% sodium starch glycolate in the binding agent dissolving tank 16 17. Add granulator 7 at a speed of 8.0t / h, liquid ammonia 5 at 6.2t / h, phosphoric acid 2 at 5.1t / h, sulfuric acid 3 at 17.0t / h, washing liquid at 34.7t / h, urea melt at 14 The feeding amount is 5.5t / h, the device production capacity is increased to 70t / h, and the production capacity is 75% higher than the design value...

Embodiment 2

[0037] Same as in Example 1, prepare a binder solution 17 containing 8% borated dextrin, 1% casein and 3% modified starch in the binder dissolving tank 16, and feed it into the granulator 7 at a speed of 10.5t / h , 6.2t / h of liquid ammonia 5, 5.5t / h of phosphoric acid 2, 17.0t / h of sulfuric acid 3, 40.5t / h of washing liquid, 5.5t / h of urea melt 14, and the production capacity of the device increased to 70t / h, the production capacity is 75% higher than the design value. The nutrient content of the obtained finished fertilizer is N%: 24.3%, P 2 o 5 %: 6.0%, K 2 O%: 10.3%.

Embodiment 3

[0039] Taking 25-05-20 urine base fertilizer as an example, the production capacity of the plant without binder is 50t / h. The original feeding amount is liquid ammonia 5 to 0.6t / h, containing 50%P 2 o 5 Concentrated phosphoric acid 2 is passed into tubular reactor 6 at 5.0t / h, washing liquid at 25.5t / h, and urea melt 14 is directly passed into granulator 7 at 13.5t / h, and the material 1 in the granulation circuit is granulated Mix in the machine 7 and bond into granules.

[0040] Take sodium carboxymethyl cellulose as binding agent, prepare the binding agent solution 17 that contains 1% sodium carboxymethyl cellulose in binding agent dissolving tank 16, this binding agent aqueous solution add-on is the fertilizer output of unit time About 21%, that is, feed into granulator 7 at a speed of 15.0t / h, liquid ammonia 5 at 0.6t / h, containing 50%P 2 o 5 Concentrated phosphoric acid 2 is 5.0t / h, washing liquid is 18.5t / h, urea melt 14 is fed at 6.5t / h, and the production capacity ...

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Abstract

The invention provides a method for improving the granulation performance of a urine-based fertilizer and belongs to the field of compound fertilizer production. The method comprises the following steps that: a granulating loop is filled with a boning agent which is one or a mixture of a plurality of water soluble organic synthetic macromoleclar polymers, inorganic macromoleclar polymers or inorganic compound filters and natural or semisynthetic water soluble macromoleclar polymers or is added with agents capable of chemically reacting with urea to produce a thickener to obtain a viscous urea meltwater; and the viscous urea meltwater is delivered to a granulating machine to be mixed with a solid raw material and a return material brought by a return conveyer to be bonded and granulated. The method is simple, easy to implement and convenient to operate and can improve the granulation performance of the urine-based fertilizer, reduce returned material and greatly improve the production capacity of the device. In addition, by adding the bonding agent, the method improves the controlled-release effect of nitrogen and the utilization rate of the fertilizer and reduces the loss of nitrogen element in soil.

Description

technical field [0001] The invention provides a method for improving the granulation performance of urine-based fertilizer, which belongs to the field of compound fertilizer production. Background technique [0002] Traditional compound fertilizer production methods mainly include agglomeration method, spray coating granulation method, tubular reactor spray bonding granulation method, high tower granulation method according to different granulation principles. The agglomeration method or the tubular reactor spraying and bonding granulation method both use liquid viscous slurry and solid fertilizer to mix in a continuously rotating drum, and the rolling of the drum drives the movement of the particles in the barrel, extruding each other, bonding, and forming Qualified fertilizer particles. The liquid phase addition of the pellet method is mainly realized by supplementing steam or adding water and washing liquid. [0003] The spraying and bonding granulation process of the t...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G5/00C05C9/00C05G3/90
CPCY02P60/21
Inventor 马凯郑秀兴王金铭杨合乐石学勇
Owner 中国-阿拉伯化肥有限公司
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