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Nitrophosphate fertilizer and preparation method thereof

A technology for nitrophosphate fertilizer and preparation steps, which is applied in the field of nitrophosphate fertilizer and can solve the problems of reduced production efficiency, easy clogging of nozzles, and not only round fertilizer particles.

Inactive Publication Date: 2020-01-31
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the technical field of preparation of nitrophosphate fertilizer by freezing method, the traditional preparation process of nitrophosphate fertilizer is mainly the biaxial granulation process, but the fertilizer granules of the biaxial granulation process are not only round; The current fertilizer demand, but the nozzles in the spray granulation process are easy to block, resulting in reduced production efficiency

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  • Nitrophosphate fertilizer and preparation method thereof
  • Nitrophosphate fertilizer and preparation method thereof
  • Nitrophosphate fertilizer and preparation method thereof

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preparation example Construction

[0031] see figure 1 , the preparation method of the nitrophosphate fertilizer of one embodiment, comprises the following steps:

[0032] Step S110: melting the concentrated nitrophosphate fertilizer slurry to obtain molten slurry.

[0033] Wherein, the mass percent concentration of the nitrophosphate fertilizer concentrated slurry is 95% to 99%.

[0034] Wherein, the step of melting the concentrated nitrophosphate fertilizer slurry is specifically: heating the concentrated nitrophosphate fertilizer slurry to 125° C. to 170° C. for melting. The melting of the nitrophosphate concentrated slurry can remove the moisture in the nitrophosphate concentrated slurry, so that the prepared nitrophosphate fertilizer has less water content and higher stability.

[0035] Wherein, the concentrated slurry of nitrophosphate fertilizer comprises the following preparation steps:

[0036] Step S111: Mix nitric acid and phosphate rock to obtain an acidolysis solution.

[0037] Step S112: Filtr...

Embodiment 1

[0066] The preparation steps of the nitrophosphate fertilizer of the present embodiment are as follows:

[0067] 1) Mix nitric acid and phosphate rock to obtain an acid solution; use a plate and frame filter press to filter the acid solution and take the filtrate; freeze and crystallize the filtrate to obtain calcium nitrate tetrahydrate crystals; use a CN filter to remove tetrahydrate Calcium nitrate crystals to obtain a clear liquid; passing ammonia gas into the clear liquid to obtain a neutralizing liquid; using an evaporator to concentrate the neutralizing liquid to obtain a concentrated neutralizing liquid;

[0068] 2) carry out polymerization reaction with the neutralized liquid after concentration, obtain nitrophosphate fertilizer concentrated slurry, wherein, the temperature of polymerization reaction is 190 ℃, the time of polymerization reaction is 50min, the mass percentage concentration of nitrophosphate fertilizer concentrated slurry is 97% ;

[0069] 3) heating t...

Embodiment 2

[0072] 1) Mix nitric acid and phosphate rock to obtain an acid solution; use a plate and frame filter press to filter the acid solution and take the filtrate; freeze and crystallize the filtrate to obtain calcium nitrate tetrahydrate crystals; use a CN filter to remove tetrahydrate Calcium nitrate crystals to obtain a clear liquid; passing ammonia gas into the clear liquid to obtain a neutralizing liquid; using an evaporator to concentrate the neutralizing liquid to obtain a concentrated neutralizing liquid;

[0073] 2) carry out polymerization reaction with the concentrated neutralization liquid, obtain nitrophosphate fertilizer concentrated slurry, wherein, the temperature of polymerization reaction is 175 ℃, the time of polymerization reaction is 60min, the mass percentage concentration of nitrophosphate fertilizer concentrated slurry is 95% ;

[0074] 3) heating the concentrated slurry of nitrophosphate fertilizer to 125° C. for melting to obtain molten slurry;

[0075] 4...

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Abstract

The invention relates to a nitrophosphate fertilizer and a preparation method thereof. The preparation method comprises: melting a nitrophosphate fertilizer concentrated slurry to obtain a molten slurry; and carrying out spray granulation on the molten slurry under a pressurized condition by adopting a steam atomization method to obtain the nitrophosphate fertilizer. According to the invention, the nitrophosphate fertilizer is prepared by adopting the steam atomization method, wherein the nitrophosphate fertilizer slurry can be prevented from blocking the spraying head under the action of steam so as to improve the production efficiency of the nitrophosphate fertilizer, and compared with the dry air atomization method, the steam atomization method eliminates the air drying step to simplifythe production process so as to further improve the production efficiency; compared with the nitrophosphate fertilizer prepared by the double-shaft granulation process, the nitrophosphate fertilizerprepared by the spray granulation process has good light roundness; and the preparation method has the advantage of high production efficiency, and the prepared nitrophosphate fertilizer has good light roundness.

Description

technical field [0001] The invention relates to the technical field of nitrophosphate fertilizer, in particular to a nitrophosphate fertilizer and a preparation method thereof. Background technique [0002] In the technical field of preparation of nitrophosphate fertilizer by freezing method, the traditional preparation process of nitrophosphate fertilizer is mainly the biaxial granulation process, but the fertilizer granules of the biaxial granulation process are not only round; However, the nozzles in the spray granulation process are easily blocked, resulting in reduced production efficiency. Contents of the invention [0003] Based on this, it is necessary to provide a method for preparing nitrophosphate fertilizer with higher production efficiency and better roundness of the prepared nitrophosphate fertilizer. [0004] In addition, a nitrophosphate fertilizer is also provided. [0005] A preparation method of nitrophosphate fertilizer, comprising the following steps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/06
CPCC05B11/06
Inventor 任光耀顾春光方进张凌云黄德明赵国军
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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