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A kind of nitrophosphate fertilizer and preparation method thereof

A technology of nitrophosphate fertilizer and calcium nitrate, which is applied to ammonium nitrate fertilizer, nitrogen fertilizer, fertilization equipment, etc., can solve the problems of high insoluble phosphorus content in nitrophosphate fertilizer and difficult operation of the neutralization process, so as to reduce the production load and difficulty, and reduce the cost , the effect of improving adaptability

Active Publication Date: 2022-03-22
GUIZHOU BATIAN ECOTYPIC ENG CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the reduction of high-grade phosphate rock resources at home and abroad in recent years, the grade and quality of phosphate rock have been declining year by year. Phosphate rock gradually showed a series of mismatches, not only the neutralization process was difficult to operate, but also the insoluble phosphorus content in the final nitrophosphate fertilizer was relatively high

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  • A kind of nitrophosphate fertilizer and preparation method thereof

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[0031] Specifically, the present application proposes a method for preparing nitrophosphate fertilizer, comprising the following steps: carrying out secondary crystallization together with part of the calcium nitrate precipitate obtained from the calcium nitrate filtration process in the frozen nitrophosphate fertilizer production process and part of the filtered calcium nitrate mother liquor, This is followed by a neutralization process.

[0032] Among them, before the calcium nitrate filtration process, it also includes acid hydrolysis of phosphate rock, precipitation and separation of acid hydrolysis insoluble matter, and calcium nitrate freeze crystallization.

[0033] In an optional embodiment, the phosphate rock mainly contains 28% to 31wt% P 2 o 5 , 41-43wt% CaO, 17-19wt% AI, 2.4-2.6wt% F, 1.10-1.24wt% Fe 2 o 3 , 1.20~1.36wt% Al 2 o 3 And 0.70 ~ 0.80wt% MgO low-grade phosphate rock.

[0034] The acid hydrolysis of phosphate rock is mainly to react phosphate rock p...

Embodiment 1

[0058] This embodiment proposes a kind of preparation method of nitrophosphate fertilizer, please refer to figure 1 , which includes the following steps:

[0059] With a main content of 28.98wt% P 2 o 5 , 42.05wt% CaO, 18.71wt% AI, 2.59wt% F, 1.14wt% Fe 2 o 3 , 1.26wt% Al 2 o 3 And 0.74wt% MgO medium and low grade phosphate rock as raw material. The medium and low-grade phosphate rock powder 1 and the nitric acid 2 with a concentration of 58wt% are added into the acidolysis tank at a stoichiometric ratio of 1.2:1 to carry out acidolysis reaction 3. The temperature of acidolysis reaction is 65°C, and the time of acidolysis is 1.5h.

[0060] The acid-insoluble matter 5 in the acid solution after the acid hydrolysis of the phosphate rock is subjected to precipitation and separation 4 to remove the precipitate.

[0061] Freeze and crystallize the acid hydrolysis solution after removing the precipitate 6 . The freezing crystallization temperature is -5°C, and the crystalli...

Embodiment 2

[0073] The present embodiment proposes a kind of preparation method of nitrophosphate fertilizer, it comprises the following steps:

[0074] With a main content of 28.98wt% P 2 o 5 , 42.05wt% CaO, 18.71wt% AI, 2.59wt% F, 1.14wt% Fe 2 o 3 , 1.26wt% Al 2 o 3 And 0.74wt% MgO medium and low grade phosphate rock as raw material. The medium and low-grade phosphate rock powder 1 and the nitric acid 2 with a concentration of 58wt% are added into the acidolysis tank at a stoichiometric ratio of 1.2:1 to carry out acidolysis reaction 3. The temperature of acidolysis reaction is 65°C, and the time of acidolysis is 1.5h.

[0075] The acid-insoluble matter 5 in the acid solution after the acid hydrolysis of the phosphate rock is subjected to precipitation and separation 4 to remove the precipitate.

[0076] Freeze and crystallize the acid hydrolysis solution after removing the precipitate 6 . The freezing and crystallization temperature is -8°C, and the crystallization time is 3.5 ...

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Abstract

The invention discloses a nitrophosphate fertilizer and a preparation method thereof, belonging to the technical field of chemical industry. The method comprises the following steps: carrying out secondary crystallization together with part of the calcium nitrate precipitate obtained in the calcium nitrate filtration step in the frozen nitrophosphate fertilizer production process and part of the filtered calcium nitrate mother liquor, followed by a neutralization step. The above method can improve the crystallization rate of calcium nitrate tetrahydrate in the production process of freezing nitrophosphate fertilizer, and then on the one hand reduce the calcium ion content in the mother liquor used for the neutralization process, reduce the viscosity of the neutralization slurry, and reduce the The production load and difficulty of the process improve the adaptability of the frozen nitrophosphate fertilizer production process to the grade of phosphate rock, and on the other hand avoid the calcium and P in the neutralization process. 2 o 5 Combined to generate insoluble phosphate, the content of water-soluble phosphorus in the final product is increased, the quality and scope of action of the fertilizer are improved, the cost is low, and the operation is simple. The water-soluble rate of phosphorus in the nitrophosphate fertilizer obtained by the method is relatively high, and the fertilizer quality is high.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a nitrophosphate fertilizer and a preparation method thereof. Background technique [0002] The production process of nitrophosphate fertilizer by freezing method is to convert phosphate rock into a kind of process through nitric acid decomposition, acid insoluble precipitation and separation, calcium nitrate freezing crystallization, calcium nitrate filtration, mother liquor neutralization process, evaporation, granulation, drying and cooling, etc. The production process of nitric acid-based compound fertilizer. This process not only utilizes the chemical energy of nitric acid to decompose phosphate rock, but also preserves nitrate as a nitrogen source in the product, playing the role of carrying phosphorus with nitrogen; at the same time, it uses nitric acid instead of sulfuric acid to decompose phosphate rock, saving sulfur resources. Countries that are deficient in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05B11/06C05C1/00
CPCC05G1/00C05B11/06C05C1/00
Inventor 冯军强李瑞韩冬芳张凌云赵国军岳秀萍樊彩梅
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD