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Polyphosphate-containing nitrogen phosphorus compound fertilizer and preparation method thereof

A technology of nitrogen-phosphorus compound fertilizer and phosphate, applied in the direction of alkaline orthophosphate fertilizer, nitrate fertilizer, urea compound fertilizer, etc. problem, to achieve the effect of high polyphosphate content, low water insoluble content and good water solubility

Active Publication Date: 2018-04-24
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a kind of nitrogen-phosphorus compound fertilizer containing polyphosphate and its preparation method, to solve the existing needs of the preparation method of nitrophosphate fertilizer with high-grade phosphate rock as raw material, nitrogen and phosphorus High specific ratio, high water insoluble content and low polyphosphate content technical problems

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  • Polyphosphate-containing nitrogen phosphorus compound fertilizer and preparation method thereof
  • Polyphosphate-containing nitrogen phosphorus compound fertilizer and preparation method thereof
  • Polyphosphate-containing nitrogen phosphorus compound fertilizer and preparation method thereof

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preparation example Construction

[0034] On the one hand, the embodiments of the present invention provide a method for preparing a polyphosphate-containing nitrogen-phosphorus compound fertilizer that has high content of phosphorus and polyphosphate, and can use low- and medium-grade phosphate rock as the phosphate rock. The preparation method process step of the embodiment of the present invention is as figure 1 As shown, it includes the following steps:

[0035] Step S01. Acid hydrolysis treatment of phosphate rock: acid hydrolysis treatment of phosphate rock with nitric acid solution, and then perform solid-liquid separation treatment, remove part of acid insoluble matter, and collect acid hydrolysis solution;

[0036] Step S02. Freeze crystallization treatment of the acid hydrolysis solution: subject the acid hydrolysis solution to freeze crystallization treatment, remove calcium nitrate tetrahydrate crystal precipitation, and collect crystallization mother liquor;

[0037] Step S03. Precipitation treatm...

Embodiment 1

[0063] This embodiment provides a polyphosphate-containing nitrogen-phosphorus compound fertilizer and a preparation method thereof. The processing step of the preparation method of this nitrogen-phosphorus compound fertilizer is as figure 1 As shown, it specifically includes the following steps:

[0064] S11. Acid hydrolysis of phosphate rock: Add enough nitric acid solution with a volume concentration of 60% to the phosphate rock powder for full acid hydrolysis, convert the phosphorus element in the phosphate rock into phosphate and hydrogen phosphate, and then filter to collect the acid The solution and the filter residue are sent to the soil conditioner to produce soil conditioner products;

[0065] S12. Frozen crystallization: Treat the acid solution under low temperature conditions of -5°C to precipitate calcium nitrate tetrahydrate crystals in the acid solution clear solution, and separate the crystals of calcium nitrate tetrahydrate through a double-drum filter, and t...

Embodiment 2

[0074] This embodiment provides a polyphosphate-containing nitrogen-phosphorus compound fertilizer and a preparation method thereof. The processing step of the preparation method of this nitrogen-phosphorus compound fertilizer is as figure 1 As shown, it specifically includes the following steps:

[0075] S21. Acid hydrolysis of phosphate rock: Add enough nitric acid solution with a volume concentration of 50% to the phosphate rock powder for full acid hydrolysis, convert the phosphorus element in the phosphate rock into phosphate and hydrogen phosphate, and then filter to collect the acid The solution and the filter residue are sent to the soil conditioner to produce soil conditioner products;

[0076] S22. Frozen crystallization: Treat the acid solution at a low temperature of -10°C to precipitate calcium nitrate tetrahydrate crystals in the acid solution clear solution, and separate the crystals of calcium nitrate tetrahydrate through a double-drum filter, and the separate...

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Abstract

The invention discloses a polyphosphate-containing nitrogen-phosphorus compound fertilizer and a preparation method thereof. The preparation method of the polyphosphate-containing nitrogen-phosphoruscompound fertilizer includes the following steps: acidolysis treatment, freeze crystallization, sedimentation treatment, evaporation concentration, neutralization treatment and a polymerization reaction. According to the method provided by the invention, the process steps are simple and easy to control, middle-low-grade phosphorite can be directly used as a raw material, and the nitrogen-phosphorus composite material with a high phosphorus content, a high polyphosphate content and the content of water insoluble matter of less than or equal to 1.2 can be prepared.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a polyphosphate-containing nitrogen-phosphorus compound fertilizer and a preparation method thereof. Background technique [0002] Nitrophosphate fertilizer is a kind of nitrogen-phosphorus compound fertilizer, which is generally produced by freezing nitrophosphate fertilizer production process with phosphate rock, nitric acid and ammonia as raw materials. The first set of nitrogen and phosphorus compound fertilizers produced by the Hydro process in my country adopts the freezing method to produce 900,000 tons of nitrogen and phosphorus compound fertilizers. It is a production device of Tianji brand nitrophosphate fertilizers. 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. . Judging from the current sales price of chemical fertilizers, the price per unit nutrient of nit...

Claims

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Application Information

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IPC IPC(8): C05B11/06C05C5/04
CPCC05B7/00C05B11/06C05C5/04C05C9/00C05D1/02C05D9/02
Inventor 范素民任光耀方进
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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