Method for preparing sulphur based compound fertilizer by decomposing rock phosphate with hydrogen nitrate and system thereof

A technology of compound fertilizer and phosphate rock powder, which is applied in the direction of fertilizer mixture, fertilization device, application, etc., to achieve the effect of direct and simple process flow, reduction of infrastructure and equipment investment, and reduction of intermediate steps

Active Publication Date: 2009-01-14
中国-阿拉伯化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process reduces the conversion dechlorination temperature, but due to the water and heat balance of the process, it is difficult to add a large amount of nitrate nitrogen

Method used

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  • Method for preparing sulphur based compound fertilizer by decomposing rock phosphate with hydrogen nitrate and system thereof
  • Method for preparing sulphur based compound fertilizer by decomposing rock phosphate with hydrogen nitrate and system thereof
  • Method for preparing sulphur based compound fertilizer by decomposing rock phosphate with hydrogen nitrate and system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The nitro-sulfur-based liquid fertilizer is produced by using the concrete conversion tank, the mixed acid pump, the filter, the ammonia neutralization tank and the like in the present invention. See the process drawing for details figure 1 . Such as figure 1 Shown is a schematic process flow diagram of one of the embodiments of the present invention. Such as Figure 4 Shown is a schematic structural view of the concrete reaction tank used in the process flow of one of the embodiments of the present invention. The reaction tank is an integral structure, and there are interlayer partitions or gaps 3 between the tanks to buffer thermal expansion; the partitions 3 can be foamed plastics, polypropylene plates or rubber plates, and the gap width is 0.5-5mm; the reaction tank is a three-layer structure, the outer Layer 1 is ordinary concrete, middle layer 2 can be FRP, acid-resistant concrete, rubber plate, inner layer 4 can be acid-resistant tiles, silicon-free acid-resi...

Embodiment 2

[0052] The nitro-sulfur-based granular fertilizer is produced by utilizing the concrete conversion tank, the mixed acid pump, the tubular reactor of the granulator and the like in the present invention. See the process drawing for details figure 2 . Such as figure 2 Shown is a schematic process flow diagram of the second embodiment of the present invention.

[0053] The 60% dilute nitric acid 3 produced by the nitric acid plant is measured by the flowmeter, and the 7.8m 3 Add 3# nitric acid to decompose the reaction tank of phosphate rock at the speed of / h, such as Figure 5 Shown is a schematic structural view of the concrete reaction tank used in the process flow of the second embodiment of the present invention. The reaction tank is an integral structure, and there are interlayer partitions or gaps 3 between the tanks to buffer thermal expansion; the partitions 3 can be foamed plastics, polypropylene plates or rubber plates, and the gap width is 0.5-5mm; the reaction...

Embodiment 3

[0058] The nitro-sulfur-based granular fertilizer is produced by utilizing the concrete conversion tank, the mixed acid pump, the tubular reactor of the granulator and the like in the present invention. See the process drawing for details image 3 . Such as image 3 Shown is a schematic process flow diagram of the third embodiment of the present invention.

[0059] After the 60% dilute nitric acid 3 produced by the nitric acid plant is measured by the flow meter, it is measured at 5.1m 3 Add 5# nitric acid to the reaction tank for decomposing phosphate rock at a speed of / h, containing P 2 o 5 30% phosphate rock powder 4 is measured with a belt weighing scale and added at the same time at 8.4t / h. The reaction temperature is 80-100°C, and the reaction product overflows through the bottom opening of the partition wall between the reaction tanks to the 6# reaction tank where the phosphate rock is decomposed with nitric acid to continue the reaction. Finally, it overflows t...

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Abstract

The invention relates to a method and a system for using nitric acid decomposed phosphate rock powder to produce a sulfur-based compound fertilizer, comprising the steps of: (1) preparing potassium bisulfate for obtaining a mixed acid I; (2) decomposing phosphate rock powder with nitric acid for acquiring a mixed acid II; (3) mixing the mixed acid I with the mixed acid II; and (4) having the mixed acid III obtained in the step (3) to react with liquid ammonia or gas ammonia for getting the sulfur-based compound fertilizer. The method and the system have a more direct and simple production process flow than that of the current nitryl sulfur-based fertilizer, and fully utilize the nitrate nitrogen and acidity of nitric acid and the heat of reaction, as well as low temperature dechlorination and sensible heat of concentrated sulfuric acid potassium chloride, thereby cutting the intermediate step, obviously reducing the energy consumption and corrosion, and lowering the capital construction and equipment investment.

Description

technical field [0001] The invention particularly relates to a method and system for sulfur-based compound fertilizers, in particular to a method and system for producing sulfur-based compound fertilizers by decomposing phosphate rock powder with nitric acid. It belongs to the field of fertilizers. Background technique [0002] Among the current methods for producing nitro-sulfur-based compound fertilizers, the most representative one is the tubular reactor-rotary drum ammoniation granulation process. Its main process features are: Potassium sulfate, ammonium nitrate and ammonium phosphate slurry sprayed out of the tubular reactor of the granulator are mixed in the drum granulator and bonded into granules. The particles are dried, sieved and packaged to be the finished product. [0003] The preparation method uses finished fertilizers such as potassium sulfate and ammonium nitrate as raw materials. The raw material ammonium nitrate is mainly obtained by neutralizing dilut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 马凯郑秀兴王金铭王礼龙宋安新
Owner 中国-阿拉伯化肥有限公司
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