Viscosity reducing method for freezing method nitrophosphate neutralized slurry

A technology of nitrophosphate fertilizer and freezing method, which is applied in fertilizer mixture, fertilization device, application and other directions, can solve problems such as affecting the normal production and product quality of nitrophosphate fertilizer, failing to meet the requirements of high tower granulation, and increasing the viscosity of neutralizing slurry, etc. Achieve the effect of improving fertilizer and utilization range, satisfying the integration of water and fertilizer, and reducing viscosity

Active Publication Date: 2017-03-22
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

However, in recent years, with the continuous decline of the grade of phosphate rock, the content of metals such as calcium, iron, magnesium, and aluminum in the phosphate rock has continued to rise, making the slurry undergo a series of gas-liquid phase chemical reactions with ammonia during the neutralization process. A large amount of gelatinous substances are generated, which leads to a sharp increase in the viscosity of the neutralization slurry, which brings great difficulties to the neutralization operation, and may even reach the point where it cannot be operated, causing the system to be forced to stop, let alone high-tower granulation requirements
This will not only bring great economic losses, consume a lot of manpower and material resources for cleaning equipment, but also directly affect the normal production and product quality of nitrophosphate fertilizer
Therefore, more and more peo

Method used

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  • Viscosity reducing method for freezing method nitrophosphate neutralized slurry
  • Viscosity reducing method for freezing method nitrophosphate neutralized slurry
  • Viscosity reducing method for freezing method nitrophosphate neutralized slurry

Examples

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Example Embodiment

[0023] Example 1

[0024] The quality index of the phosphate rock 1 of this embodiment: P 2 O 5 31.2%, CaO 44.4%, F 2.8%, AI 13.2%, Fe 2 (Al 2 O) 3 Total 2.5%, other impurities; the concentration of nitric acid 2 is 58%.

[0025] Nitric acid 2 and phosphate rock 1 are added to the acid hydrolysis tank at a stoichiometric ratio of 1.2:1 for acid hydrolysis reaction 3. The acid insoluble matter 5 in the acid hydrolysis solution is separated by precipitation separation 4, and then the acid insoluble matter 5 is completely separated The acid hydrolysis liquid is sent to the frozen crystal 6, and the frozen crystal calcium nitrate 8 is separated from the acid hydrolysis liquid and enters the calcium nitrate filter 7 for solid-liquid separation. The resulting liquid is the mother liquid 9, and then the mother liquid 9 is sent to the mother liquid defluorination tank 11 In the process, the mother liquor is defluorinated by adding potassium nitrate 10, and the fluorosilicate ions in the m...

Example Embodiment

[0026] Example 2

[0027] The quality index of the phosphate rock 1 of this embodiment is different from that of the first embodiment, and the quality index is: P 2 O 5 32.5%, CaO 47%, F2.9%, AI 6.0%, Fe 2 (Al 2 O) 3 Total 2.2%, other impurities; the concentration of nitric acid 2 is 58%.

[0028] Nitric acid 2 and phosphate rock 1 are added to the acid hydrolysis tank at a stoichiometric ratio of 1.2:1 for acid hydrolysis reaction 3. The acid insoluble matter 5 in the acid hydrolysis solution is separated by precipitation separation 4, and then the acid insoluble matter 5 is completely separated The acid hydrolysis liquid is sent to the frozen crystal 6, and the frozen crystal calcium nitrate 8 is separated from the acid hydrolysis liquid and enters the calcium nitrate filter 7 for solid-liquid separation. The resulting liquid is the mother liquid 9, and then the mother liquid 9 is sent to the mother liquid defluorination tank 11 In the process, the mother liquor is defluorinated...

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Abstract

The invention discloses a viscosity reducing method for freezing method nitrophosphate neutralized slurry. According to the viscosity reducing method, on the basis of the freezing method nitrophosphate technological process, a resin exchange procedure is added for removing metal ions of calcium, magnesium, aluminum and iron in defluorinated mother liquor, and the purpose of reducing the viscosity of the neutralized mother liquor slurry is achieved. Through the method, the viscosity of the neutralized slurry is reduced, the cost is low, operation is simple, secondary pollution is avoided, obtained products are good in physical and chemical property, high in water solubility and wide in application range and meet the integration demand of water and fertilizer.

Description

technical field [0001] The invention relates to a production method of high-concentration water-soluble nitrophosphate fertilizer, in particular to a viscosity-reducing method for neutralizing slurry of high-concentration water-soluble nitrophosphate fertilizer produced by using low-grade phosphate rock. [0002] technical background [0003] Freezing nitrophosphate fertilizer production technology is a production process of nitric acid, phosphate rock and ammonia gas as raw materials, which are frozen and crystallized to produce nitrophosphate fertilizer, such as Jing Hongjian, Chen Mingliang, Chen Jingyu, etc. Freezing method nitrophosphate fertilizer production technology[M] . Beijing: Chemical Industry Press, 2002. Its production process includes acid hydrolysis of phosphate rock, precipitation and separation of acid insoluble matter, freezing crystallization, filtration of calcium nitrate, neutralization of mother liquor ammonia, evaporation of neutralization slurry, biax...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 樊彩梅李瑞李双志冯军强张凌云荆宏健张小超
Owner TAIYUAN UNIV OF TECH
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