A kind of preparation method of sulfur-containing ammonium phosphate

A technology of sulfur-containing ammonium phosphate and diammonium phosphate, applied in the direction of phosphate and phosphorus-containing oxyacid, can solve the problems of uneven sulfur content and reduce the frequency of returning materials, so as to achieve no potential safety hazards, reduce the frequency of returning materials, and reduce the source of wide range of effects

Active Publication Date: 2017-11-21
YUNNAN YUNTIANHUA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a production method for sulfur-containing ammonium phosphate aimed at the deficiencies of the prior art, which can solve the shortcomings of the existing diammonium phosphate products with uneven sulfur content, reduce the frequency of returning materials in the production process, and reduce the risk of dust explosion. Possibility, and effectively use the washing liquid of the existing ammonium phosphate plant to prepare high-quality sulfur-containing ammonium phosphate products

Method used

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  • A kind of preparation method of sulfur-containing ammonium phosphate
  • A kind of preparation method of sulfur-containing ammonium phosphate
  • A kind of preparation method of sulfur-containing ammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Production of sulfur-containing ammonium phosphate, such as figure 1 Shown:

[0026] Step 1: Add sulfur particles with a particle size of no more than 1cm to the wet mill through a belt in an amount of no more than 30% of the mass ratio after mixing with the washing liquid, and mix them with a specific gravity of 1.1g / L, pH=1, P 2 o 5 The calculated amount of 5% washing liquid was wet milled to obtain a sulfur-containing washing liquid with a particle size of 500 μm and a solid content of 40%, and material A was obtained.

[0027] The second step: producing sulfur-containing ammonium phosphate. Put the above material A into figure 1 Introduce it into a storage tank, add phosphoric acid with a concentration of 46%, transport it to a tubular reactor, granulate after the reaction is completed, dry with hot air below 250°C, crush and sieve to obtain sulfur-containing ammonium phosphate.

[0028] Table 1 Analysis results of sulfur-containing ammonium phosphate

[0029] ...

Embodiment 2

[0031] Step 1: Add sulfur particles with a particle size of not more than 1cm to the wet mill through a belt in an amount of not more than 45% of the mass ratio after mixing with the washing liquid, and mix the sulfur particles with a specific gravity of 1.15g / L, pH=2, P 2 o 5 The calculated amount of 12% washing solution was wet milled to obtain a sulfur-containing washing solution with a particle size of 75 μm and a solid content of 55%, and material A was obtained.

[0032] The second step: producing sulfur-containing ammonium phosphate. Put the above material A into figure 1 It is directly introduced into the reactor and mixed with the ammonium phosphate slurry in the reactor to obtain slurry B, which is transported to a granulator for granulation, dried with hot air below 250°C, crushed and screened to obtain sulfur-containing ammonium phosphate.

[0033] Table 2 Analysis results of sulfur-containing heavy calcium

[0034]

Embodiment 3

[0036] Step 1: Add sulfur particles with a particle size of not more than 1cm to the wet mill through a belt in an amount of not more than 60% of the mass ratio after mixing with the washing liquid, and mix them with a specific gravity of 1.2g / L, pH=3, P 2 o 5 The calculated amount of 20% of the washing solution was wet milled to obtain a sulfur-containing washing solution with a particle size of 20 μm and a solid content of 70%, and material A was obtained.

[0037] The second step: producing sulfur-containing ammonium phosphate. Put the above material A into figure 1 Introduce it into a storage tank, add phosphoric acid with a concentration of 46%, transport it to a tubular reactor, granulate after the reaction is completed, dry with hot air below 250°C, crush and sieve to obtain sulfur-containing ammonium phosphate.

[0038] Table 3 Analysis results of sulfur-containing ammonium phosphate

[0039]

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Abstract

The invention discloses a preparation method of sulfur-containing ammonium phosphate. The preparation method comprises the steps that a diammonium phosphate device washing solution and elemental sulfur granules are together subjected to wet grinding, the size of the sulfur granules is controlled according to the production requirement, the sulfur granules are sieved and then conveyed to a reactor of an ammonium phosphate production device or conveyed to a storage tank to be mixed with wet process phosphoric acid and then conveyed to the reactor to react with liquid ammonia, and granulating and drying are performed to obtain sulfur-containing ammonium phosphate. According to the preparation method, the fertilizer containing more than two nutrient elements including phosphorus and sulfur is produced through the existing diammonium phosphate device washing solution, an original process route is not changed, and a low-cost product upgrading method is supplied to a traditional device. The obtained product contains uniform elemental sulfur, the returning frequency is significantly decreased, and the dust explosion possibility is reduced.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer production, and in particular relates to a preparation method of sulfur-containing ammonium phosphate. Background technique [0002] Ammonium phosphate mainly includes diammonium phosphate and monoammonium phosphate in China. The same device can be used to control different neutralization degrees to obtain different ammonium phosphate products. Traditional ammonium phosphate plants produce sulfur fertilizer by spraying liquid sulfur on the ammonified material or wrapping a layer of liquid sulfur on the product. These methods will result in inconsistent particle size and uneven distribution of sulfur. Due to the difference in the process, the liquid sulfur spraying during the reaction process will cause the molten sulfur to agglomerate due to the drop in temperature, and cannot be uniformly dispersed in the material; if the molten sulfur is sprayed in the granulation process, it will l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28
CPCC01B25/28
Inventor 师永林张应虎匡家灵杨跃华李志祥舒艺周陈红琼杨心师赵熙碧
Owner YUNNAN YUNTIANHUA
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