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System and method for increasing nitric phosphate product P2O5 dissolvability in water

A technology of P2O5, nitrophosphate fertilizer, applied in the field of nitrophosphate fertilizer production, can solve the problems of affecting product quality, reducing water solubility, low water solubility and the like

Inactive Publication Date: 2015-12-30
TIANJI COAL CHEM IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But as the degree of neutralization increases, part of the phosphate that will continue to be generated will be converted into insoluble calcium phosphate, and the Ca in the mother liquor 2+ The higher the value, the more insoluble calcium phosphate is generated, resulting in P in the final product 2 o 5 The water solubility rate is reduced, which affects the quality of the product
[0004] The method of freezing nitrophosphate fertilizer to remove crystallized calcium nitrate has the advantages of high product concentration and single raw material, but it can only separate 65% to 75% of the total calcium in the acid hydrolysis slurry, and the calcium removal rate is not high enough, resulting in the final product of nitrophosphate fertilizer P in the product 2 o 5 The water solubility is low, thus reducing the P 2 o 5 Utilization of

Method used

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  • System and method for increasing nitric phosphate product P2O5 dissolvability in water
  • System and method for increasing nitric phosphate product P2O5 dissolvability in water

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Embodiment 1

[0050] Improve nitrophosphate fertilizer product P 2 o 5 For the water-soluble rate system, the nitric acid with a concentration of 62% and phosphate rock are acidified in the acid hydrolysis tank. Since the phosphate rock contains impurities such as iron, aluminum and silicon, acid insolubles will be produced after acid hydrolysis; the acid hydrolysis tank The acid solution overflowed in 1 is drained to the acid insoluble matter settling tank 2 for natural settlement, the acid insoluble matter in the lower layer is collected and discharged, and the supernatant liquid flows into the crystallizer 3, and the ammonia water with a mass fraction of 20% is used as the coolant Carry out heat exchange crystallization cooling with acidolysis solution; The calcium nitrate crystal suspension after the crystallization is drained in the calcium nitrate filter 4 from the crystallizer 3, the calcium nitrate filter cake formed by filtration is converted into ammonium nitrate through method tr...

Embodiment 2

[0052] Improve nitrophosphate fertilizer product P 2 o 5 For the water-soluble rate system, the nitric acid with a concentration of 60% and the phosphate rock are acidolyzed in the acid hydrolysis tank 1. Since the phosphate rock contains impurities such as iron, aluminum and silicon, acid insolubles will be produced after acid hydrolysis; The acid solution overflowed in the tank 1 is diverted to the acid insoluble matter settling tank 2 for natural settlement, the acid insoluble matter in the lower layer is collected and discharged, and the supernatant liquid flows into the crystallizer 3, and is cooled by ammonia water with a mass fraction of 20% Carry out heat exchange and crystallization cooling with the acid solution; the calcium nitrate crystal suspension after crystallization is drained from the crystallizer 3 to the calcium nitrate filter 4, and the calcium nitrate filter cake formed by filtration is converted into ammonium nitrate through method treatment, The mother...

Embodiment 3

[0054] Improve nitrophosphate fertilizer product P 2 o 5 For the system with water solubility, acid hydrolyze the nitric acid and phosphate rock with a concentration of 60% in the acidolysis tank 1. Since the phosphate rock contains impurities such as iron, aluminum and silicon, acid insolubles will be produced through acid hydrolysis; The acid solution overflowed in the tank 1 is diverted to the acid insoluble matter settling tank 2 for natural settlement, the acid insoluble matter in the lower layer is collected and discharged, and the supernatant liquid flows into the crystallizer 3, and is cooled by ammonia water with a mass fraction of 20% Carry out heat exchange and crystallization cooling with the acid solution; the calcium nitrate crystal suspension after crystallization is drained from the crystallizer 3 to the calcium nitrate filter 4, and the calcium nitrate filter cake formed by filtration is converted into ammonium nitrate through method treatment, The mother liq...

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Abstract

The invention discloses a system and a method for increasing a nitric phosphate product P2O5 dissolvability in water, belonging to the field of nitric phosphate production. Phosphorite is subjected to acidolysis, acid non-soluble substance separation, crystallization, filtering, neutralization, nitrogen and phosphorus evaporation, prilling, drying, screening, cooling and packing; mother liquor and potassium sulphate are added into a neutralizing tank according to a ratio, a small part of residual Ca<2+> are converted into calcium sulfate, generation of citric acid-soluble calcium hydrophosphate salt and insoluble phosphate is reduced, and K<+> is added in slurry. After the system is used, the production method is energy-saving and environment-friendly, a nutrient element kalium needed by plants is supplemented in a product while the dissolvability in water of a finished product P2O5 is increased, the material viscosity in a low temperature state in a neutralization process is reduced, and the quality of nitric phosphate is comprehensively improved.

Description

technical field [0001] The invention belongs to the field of nitrophosphate fertilizer production, and in particular relates to a system and method for neutralizing mother liquor ammonia in the production of nitrophosphate fertilizer by using nitric acid and phosphate rock as raw materials indirect freezing method, which is used to increase the P content of nitrophosphate fertilizer products. 2 o 5 Water solubility. Background technique [0002] Nitrophosphate fertilizer production adopts indirect freezing decalcification and biaxial horizontal granulation technology. The production process mainly includes: nitric acid decomposition of phosphate rock, separation of acid insoluble matter, separation of calcium nitrate crystallization, neutralization of mother liquid ammonia, concentration of NP slurry, granulation, drying, screening, packaging, and conversion of calcium nitrate to prepare ammonium nitrate, etc. . [0003] During the neutralization process of the nitrophosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/06
Inventor 王志华畅学华魏安根牛国明郭卫东刘铁军
Owner TIANJI COAL CHEM IND GROUP
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