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Method for decomposing phosphorite through urea nitrate to prepare granular urea nitrate compound fertilizer

A technology of nitro compound fertilizer and compound fertilizer, which is applied in the directions of nitrate fertilizer, urea compound fertilizer, phosphate fertilizer, etc., can solve the problems of affecting fertilizer nutrients, declining economic benefits, calcium polyphosphate, etc.

Inactive Publication Date: 2018-09-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional process of decomposing phosphate rock with nitric acid has the following disadvantages: when nitric acid decomposes phosphate rock, the final product of calcium in the ore is calcium nitrate, if CaO and P in the phosphate rock 2 o 5 If the molar ratio is above 3.33, there will be less calcium phosphate radicals, and there will be precipitated calcium phosphate (CaHPO) during product processing. 4 ) precipitation; if CaO and P 2 o 5 When the molar ratio is 2, more than 1 / 3 of CaO will exist in the form of calcium nitrate
This hygroscopic property will not only affect the nutrients of the fertilizer, but may also cause the product to absorb moisture and agglomerate, which will bring great difficulties to storage, transportation and application, which will lead to a decline in economic benefits and waste of resources.

Method used

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  • Method for decomposing phosphorite through urea nitrate to prepare granular urea nitrate compound fertilizer
  • Method for decomposing phosphorite through urea nitrate to prepare granular urea nitrate compound fertilizer
  • Method for decomposing phosphorite through urea nitrate to prepare granular urea nitrate compound fertilizer

Examples

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Effect test

Embodiment 1

[0073] Embodiment 1: Decompose phosphate rock with urea nitric acid to prepare granular urea nitro compound fertilizer

[0074] The implementation steps of this embodiment are as follows:

[0075] A, preparation of urea nitric acid aqueous solution

[0076] Solid urea, nitric acid with a concentration of 45% by weight and water are mixed and dissolved in a molar ratio of 1.6:1.0:4.0 to obtain an aqueous solution of urea nitric acid;

[0077] B. Decomposition of phosphate rock

[0078] According to the weight ratio of urea nitric acid aqueous solution and phosphate rock powder 4.0:1.0, in the urea nitric acid aqueous solution that step A obtains, add particle size and be-100 order (150 μ m) reaches 95.2%, P 2 o 5 Content is phosphate rock powder of 25% by weight, then reacted at a temperature of 28° C. for 60 minutes to obtain an acidic slurry; adopt NY / T 1973-2010 Water-soluble Fertilizer Water-insoluble Content and pH Determination Method Detection, said The pH of the aci...

Embodiment 2

[0084] Embodiment 2: Decompose phosphate rock with urea nitric acid to prepare granular urea nitro compound fertilizer

[0085] The implementation steps of this embodiment are as follows:

[0086] A, preparation of urea nitric acid aqueous solution

[0087] Solid urea, nitric acid with a concentration of 50% by weight and water are mixed and dissolved in a molar ratio of 0.3:1.0:4.2 to obtain an aqueous solution of urea nitric acid;

[0088] B. Decomposition of phosphate rock

[0089] According to the weight ratio of urea nitric acid aqueous solution and phosphate rock powder 2.8:1.0, in the urea nitric acid aqueous solution that step A obtains, add particle size and be-100 order (150 μ m) reach 95.8%, P 2 o 5 Content is phosphate rock powder of 15% by weight, then reacted at a temperature of 20° C. for 30 minutes to obtain an acidic slurry; adopt NY / T 1973-2010 Water-soluble Fertilizer Water-insoluble Content and pH Determination Method Detection, said The pH of the acidi...

Embodiment 3

[0095] Embodiment 3: Decompose phosphate rock with urea nitric acid to prepare granular urea nitro compound fertilizer

[0096] The implementation steps of this embodiment are as follows:

[0097] A, preparation of urea nitric acid aqueous solution

[0098] Solid urea, nitric acid with a concentration of 48% by weight and water are mixed and dissolved according to the molar ratio of 2.0:1.0:4.4 to obtain an aqueous solution of urea nitric acid;

[0099] B. Decomposition of phosphate rock

[0100] According to the weight ratio of urea nitric acid aqueous solution and phosphate rock powder 3.2:1.0, in the urea nitric acid aqueous solution that step A obtains, add particle size and be-100 order (150 μ m) reaches 96.1%, P 2 o 5 Content is phosphate rock powder of 20% by weight, then reacted at a temperature of 45° C. for 15 minutes to obtain an acidic slurry; adopt NY / T 1973-2010 Water-soluble Fertilizer Water-insoluble Content and pH Determination Method Detection, said The p...

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Abstract

The invention relates to a method for decomposing phosphorite through urea nitrate to prepare a granular urea nitrate compound fertilizer. The method includes the steps of preparing a urea nitrate water solution and conducting phosphorite decomposing, neutralizing, granulating and the like. The compound fertilizer is prepared through the one-step method of decomposing phosphorite through the ureanitrate solution, the temperature required for reaction is low, the volatile loss of nitrogen is reduced, the phosphorite conversion rate can reach 95% or above, the defect that a calcium nitrate product is prone to moisture absorption in the process of decomposing phosphorite through nitric acid is overcome by means of the method, the fluorine escape rate is greatly reduced, and the method is anenergy-saving and environment-friendly type urea nitrate compound fertilizer production process with diversified nitrogen nutrient form and high efficiency.

Description

【Technical field】 [0001] The invention belongs to the technical field of fertilizer production. More specifically, the invention relates to a method for preparing granular urea nitro compound fertilizer by decomposing phosphate rock with urea nitric acid. 【Background technique】 [0002] The traditional process of decomposing phosphate rock with nitric acid has the following disadvantages: when nitric acid decomposes phosphate rock, the final product of calcium in the ore is calcium nitrate, if CaO and P in the phosphate rock 2 o 5 If the molar ratio is above 3.33, there will be less calcium phosphate radicals, and there will be precipitated calcium phosphate (CaHPO) during product processing. 4 ) precipitation; if CaO and P 2 o 5 When the molar ratio is 2, more than 1 / 3 of CaO will exist in the form of calcium nitrate. The hygroscopicity of calcium nitrate is particularly high. When the temperature is 30°C, the critical relative humidity is 46.7%. If it is mixed with am...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B7/00C05G5/12C05B13/02C05B17/00C05C3/00C05C5/00C05C9/00C05D1/02
Inventor 侯翠红王好斌苗俊艳王艳语朱基琛张保林
Owner ZHENGZHOU UNIV
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