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

CN106518222AActive Publication Date: 2017-03-22TAIYUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-03-22

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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.
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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...

Examples

Embodiment 1

[0024] The quality indicator of the phosphate rock 1 of the present embodiment: P 2 o 5 31.2%, CaO 44.4%, F 2.8%, AI 13.2%, Fe 2 (Al 2 O) 3 A total of 2.5%, other impurities; the concentration of nitric acid 2 was 58%.

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

Embodiment 2

[0027] The quality index of the phosphate rock 1 of the present embodiment is different from that of embodiment one, 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; concentration of nitric acid 2 was 58%.

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