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A kind of production method of defluorinated high-concentration nitro-nitrogen, phosphorus and potassium compound fertilizer

A technology of nitro-nitrogen-phosphorus-potassium and a production method, which is applied in the production field of defluorination high-concentration nitro-phosphorus-potassium compound fertilizer, and achieves the effects of good compatibility, wide application range and strong market competitiveness

Active Publication Date: 2014-10-15
TIANJI COAL CHEM IND GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is of strategic significance to develop and utilize medium and low-grade phosphate rock to produce high-concentration defluorinated nitro-nitrogen, phosphorus, and potassium compound fertilizers on the basis of existing nitrophosphate fertilizer plants.

Method used

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  • A kind of production method of defluorinated high-concentration nitro-nitrogen, phosphorus and potassium compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The quality indicator of the phosphate rock 1 of the present embodiment: P 2 o 5 27%, CaO 42%, AI 18%, F 2.9%, MgO 2%, Fe 2 (Al 2 O) 3 A total of 3%, other impurities; the concentration of nitric acid 2 is 58%.

[0041] Nitric acid 2 and phosphate rock 1 are added into 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 preliminarily separated by precipitation and separation 4, and the separated acidolysis solution enters the acid insoluble In the deep removal process 6, the acid insoluble matter is removed 6 by adding flocculant 7, and after 0.5-1 hour of flocculation and precipitation, the acid insoluble matter 9 is deeply removed by solid-liquid filtration separation 8, and the acid insoluble matter is completely separated The acid solution solution is sent into frozen crystallization 10, and through freezing crystallization calcium nitrate 12 is separated out fro...

Embodiment 2

[0045] 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 22%, CaO 45%, AI 18.7%, F 2.5%, MgO 2.0%, Fe 2 (Al 2 O) 3 A total of 3.2%, other impurities; the concentration of nitric acid 2 was 58%.

[0046] Other processes are the same as the production process of the defluorinated high-concentration nitro-nitrogen, phosphorus, and potassium compound fertilizer in Example 1.

[0047] The total nutrient concentration of the NPK compound fertilizer 26 product obtained in the present embodiment is more than or equal to 40%, which contains P 2 o 5 11%, N 20%, K 2 O 7%, other nutrients 2.0%.

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Abstract

The invention discloses a production method of defluorinated high-concentration nitro-nitrogen, phosphorus, and potassium compound fertilizer, which is based on the existing process route for the production of nitrophosphate fertilizer, and a step of deep removal of acid-insoluble matter is added in the step of precipitation and separation of acid-insoluble matter, In order to completely separate the acid-insoluble matter; between calcium nitrate filtration and mother liquor neutralization, a mother liquor defluorination step is added, by adding potassium nitrate to the mother liquor, the fluorosilicate ions and potassium ions in the mother liquor react to form potassium fluorosilicate After crystallization, the slurry after the defluorination reaction is filtered to separate potassium fluorosilicate, and the obtained defluorination mother liquor is added with potassium nitrate and ammonium nitrate, subjected to ammonia neutralization, evaporation, granulation, drying and cooling treatment, that is, high-concentration nitrate NPK compound fertilizer. The present invention uses medium and low-grade phosphate rock to prepare compound fertilizer, which not only recycles fluorine resources, but also obtains potassium fluorosilicate as a by-product, and reduces the pollution of fluorine to the environment. The obtained product has good physical and chemical properties, does not contain chlorine, and has a wide range of applications , not easy to agglomerate, and has strong market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a production method of defluorinated high-concentration nitro-nitrogen, phosphorus and potassium compound fertilizer. Background technique [0002] At present, the nitro compound fertilizers on the market generally use ammonium nitrate as the nitrogen source, and the compound fertilizers with high concentrations of N, P, and K are produced by adding compound fertilizer materials such as phosphorus and potassium. Nitrogen and phosphorus compound fertilizers are produced by decomposing phosphate rock with nitric acid and removing calcium by freezing. The process route is advanced, the fertilizer variety is good, and the agricultural effect is obvious. It plays an important role in the national economy. [0003] Judging from the current sales price of chemical fertilizers, the unit nutrient price of nitrophosphate fertilizer is the lowest among all kinds of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 荆宏健樊彩梅冯军强畅学华王志华魏安根刘金亮李瑞高海生李双志
Owner TIANJI COAL CHEM IND GROUP
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