Preparation method for sulfur-containing phosphate fertilizer

A technology of phosphate fertilizer and phosphoric acid, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of uneven mixing of reactors, explosion hazards of elemental sulfur dust, etc., and achieve good dispersion effect and wide application range.

Inactive Publication Date: 2015-09-09
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above-mentioned patent documents disclose many improvements, there are still problems, such as: inhomogeneous mixing in the reactor, the pass rate of the final product needs to be controlled by retu

Method used

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  • Preparation method for sulfur-containing phosphate fertilizer
  • Preparation method for sulfur-containing phosphate fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Production of monoammonium thiophosphate, such as figure 1 Shown:

[0025] The first step: firstly take the sulfuric acid tail gas absorption liquid, add phosphoric acid and 150 microns of calcium sulfate to make the sulfate radical content 0.5%, the calcium content 0.1%, and the phosphorus pentoxide 8%. Grind sulfur into sulfur powder with a fineness of 180 microns. According to the demand for sulfur in the product (the ratio of elemental sulfur or sulfate), mix the sulfur powder with the sulfuric acid tail gas absorption liquid mixed with additives in a proportion of 50%. Mix and stir evenly, and then introduce 15% of phosphoric acid mass into phosphoric acid.

[0026] The second step: producing monoammonium thiophosphate granules. The applied reactor is a tubular reactor. The above-mentioned phosphoric acid is introduced into the tubular reactor, and ammonia gas is passed through, the mixture is reacted at 120°C, and monoammonium phosphate (diammonium phosphate ca...

Embodiment 2

[0030] Production of monoammonium thiophosphate, such as figure 1 Shown:

[0031] Step 1: first take the sulfuric acid tail gas absorption liquid, add phosphoric acid and 150 microns of calcium sulfate to make the sulfate radical content 1.0%, the calcium content 0.2%, and the phosphorus pentoxide 10%. Grind sulfur into sulfur powder with a fineness of 180 microns. According to the demand for sulfur in the product (the ratio of elemental sulfur or sulfate), mix the sulfur powder with the sulfuric acid tail gas absorption liquid mixed with additives in a proportion of 30%. Mix and stir evenly, and then introduce 10% of phosphoric acid mass into phosphoric acid.

[0032] Second step: operate according to the second step of Example 1 to obtain the product, and the analysis results are shown in 2.

[0033] Table 2, analysis results of sulfur and phosphate fertilizers

[0034] Indicator name Total N / (%) Effective P 2 o 5 / (%) Total S / (%) h 2 O / (%) Compres...

Embodiment 3

[0036] Production of monoammonium thiophosphate, such as figure 1 Shown:

[0037] Step 1: first take the sulfuric acid tail gas absorption liquid, add phosphoric acid and 150 microns of calcium sulfate to make the sulfate radical content 1.5%, the calcium content 0.3%, and the phosphorus pentoxide 12%. Grind sulfur into sulfur powder with a fineness of 180 microns. According to the demand for sulfur in the product (the ratio of elemental sulfur or sulfate), mix and stir the sulfur powder at 10% with the sulfuric acid tail gas absorption liquid mixed with additives. uniform, and then introduced into phosphoric acid by 20% of the mass of phosphoric acid.

[0038] Second step: operate according to the second step of Example 1 to obtain the product, and the analysis results are shown in 3.

[0039] Table 3, analysis results of sulfur and phosphate fertilizers

[0040] Indicator name Total N / (%) Effective P 2 o 5 / (%) Total S / (%) h 2 O / (%) Compressive str...

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Abstract

The invention discloses a preparation method for a sulfur-containing phosphate fertilizer. The method includes: firstly adding additives into an absorption liquid of sulfuric acid tail gas, endowing the absorption liquid with dispersibility to sulfur granules, performing mixing, then adding the mixture into phosphoric acid, using an existing phosphate fertilizer production device, and carrying out reaction, granulation and drying, thus obtaining the product. The method provided by uses sulfuric acid plant tail gas absorption liquid cyclically, utilizes existing ammonium phosphate, triple superphosphate plant and other traditional phosphate fertilizer devices to prepare the fertilizer containing over two nutrient elements of nitrogen, phosphorus, potassium and sulfur, and provides a low cost product upgrading method for traditional device.

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 phosphate fertilizer. Background technique [0002] Sulfur fertilizers are fertilizers that contain sulfur. The traditional way of producing sulfur fertilizer with phosphate fertilizer equipment is to spray liquid sulfur on the ammonified material or wrap a layer of liquid sulfur on the product. These methods all have the phenomenon of uneven mixing, and even the formation of lumps after the sulfur is cooled, resulting in fluctuations in product quality. [0003] After searching, it is found that Chinese patent 96193527.8 describes "sulfur-containing fertilizer and its preparation method", which is solidified and granulated by passing molten sulfur into the reactor and mixing with phosphorus fertilizer slurry. 201080005679.3 describes "Sulphur-containing fertilizers and methods for their preparation" ...

Claims

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Application Information

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IPC IPC(8): C05G1/00
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段家堂宋玲凤
Owner YUNNAN YUNTIANHUA
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