Production method of high-concentration water-soluble nitrophosphate fertilizer

A production method, nitrophosphate fertilizer technology, applied in the direction of ammonium nitrate fertilizer, nitrate fertilizer, nitrogen fertilizer, etc., can solve the problems of ineffective utilization of re-production calcium sulfate, increased precipitation of magnesium, aluminum and iron, waste of resources, etc., to meet the needs of water and fertilizer integration , zero-emission resources, and low-cost effects

Pending Publication Date: 2017-04-19
GUIZHOU BATIAN ECOTYPIC ENG CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the recent decrease in the price of cement, the decrease in the demand for calcium carbonate, the continuous decline in the grade of phosphate rock and the continuous increase in the content of magnesium, iron and aluminum in this production process, calcium sulfate cannot be effectively utilized and precipitation of magnesium, aluminum and iron is increasing day by day. , serious waste of resources and production bottlenecks have emerged. Therefore, how to realize the water-soluble production of nitrophosphate fertilizer under the premise of ensuring green production and maximizing the utilization of resources has become a technical problem and research goal of nitrophosphate fertilizer production

Method used

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  • Production method of high-concentration water-soluble nitrophosphate fertilizer

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Embodiment 1

[0025] 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%.

[0026]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 m...

Embodiment 2

[0028] 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%.

[0029] 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...

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Abstract

The invention discloses a production method of a high-concentration water-soluble nitrophosphate fertilizer. The method is characterized in that a resin exchange procedure is added on the basis of the freezing nitrophosphate fertilizer technological process to remove metal ions like calcium ions, magnesium ions, aluminum ions and iron ions in a defluorination mother liquid, and the water-soluble nitrophosphate fertilizer is prepared; and besides, a calcium ammonium nitrate production procedure is added after the resin exchange procedure, and a by-product generated from resin exchange is converted into a calcium ammonium nitrate product. According to the method, while the freezing nitrophosphate fertilizer technology is utilized to produce the water-soluble fertilizer, the production expense is reduced and operation is simplified; besides, generation of reproduced calcium sulfate and accumulation of magnesium aluminum iron phosphate deposits are avoided, and the requirements of effective resource utilization and zero emission are achieved; and the obtained product is good in physical and chemical properties, high in water solubility and wide in application range, fertilizer flushing, drip irrigation, topdressing and soilless culture of crops are facilitated, and the requirement of integration of water and fertilizers is met.

Description

technical field [0001] The invention relates to a production method of high-concentration water-soluble nitrophosphate fertilizer, in particular to an improved production process of high-concentration water-soluble nitrophosphate fertilizer by effectively utilizing by-products to produce calcium ammonium nitrate. [0002] technical background [0003] The production technology of nitrophosphate fertilizer by freezing method is a production process of producing nitrophosphate fertilizer by freezing and crystallizing nitric acid, phosphate rock and ammonia gas ([Jing Hongjian, Chen Mingliang, Chen Jingyu, etc. Production technology of nitrophosphate fertilizer by freezing method[M] . Beijing: Chemical Industry Press, 2002]), its production process mainly 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/06C05C1/00C05C5/04
CPCC05B11/06C05C1/00C05C5/04
Inventor 冯军强樊彩梅张凌云荆宏健李双志李瑞江寿良任光耀
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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