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A method for preparing polyphosphate-containing compound fertilizer by decomposing phosphate rock with nitric acid

A polyphosphate and compound fertilizer technology, which is applied to ammonium nitrate fertilizers, calcium/strontium/barium nitrates, phosphorus compounds, etc., can solve the problems of strict conditions, unfavorable energy saving and emission reduction, and high energy consumption, and achieve high energy consumption , The effect of expanding the selection range and reducing energy consumption

Active Publication Date: 2017-10-17
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology can only realize the chemical reaction of ammonium polyphosphate under negative pressure, and the conditions are relatively strict, and the energy consumption is high, which is not conducive to achieving the purpose of energy saving and emission reduction

Method used

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  • A method for preparing polyphosphate-containing compound fertilizer by decomposing phosphate rock with nitric acid
  • A method for preparing polyphosphate-containing compound fertilizer by decomposing phosphate rock with nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 2 Shown, a kind of method with nitric acid decomposition phosphate rock is prepared to contain polyphosphate compound fertilizer, comprises the following steps:

[0025] (1) Digest 10kg of apatite with 2L of nitric acid with a mass fraction of about 65%;

[0026] (2) crystallization, the crystallization of calcium nitrate is removed by filtration;

[0027] (3) neutralize with 2L ammonia;

[0028] (4) the pressure is reduced to -0.05MPa for evaporation and concentration, until the water content is 2% by weight,

[0029] (5) Pressurize again to more than normal pressure, the reaction temperature is normal temperature, and polymerization reaction takes place to generate polyphosphate.

Embodiment 2

[0031] Such as figure 2 Shown, a kind of method with nitric acid decomposition phosphate rock is prepared to contain polyphosphate compound fertilizer, comprises the following steps:

[0032] (1) Digest 10kg of apatite with 2L of nitric acid with a mass fraction of about 65%;

[0033] (2) crystallization, the crystallization of calcium nitrate is removed by filtration;

[0034] (3) neutralize with 2L ammonia;

[0035] (4) pressure is reduced to-0.05MPa and is evaporated and concentrated to water content and is 2% weight,

[0036] (5) Pressurize again to 102.3KPa, the reaction temperature is 170°C, and react for 1.5 hours to generate polyphosphate.

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Abstract

A method of preparing a polyphosphate composite fertilizer through decomposing phosphate rock with nitric acid is disclosed. The method includes (1) digesting the phosphate rock with the nitric acid, (2) crystallizing, and filtering calcium nitrate, (3) neutralizing with ammonia, (4) depressurizing to -0.05 MPa or below, evaporating and concentrating until the water content is not more than 2% by weight and (5) pressurizing to atmospheric pressure or above, and polymerizing to generate polyphosphate with the reaction temperature being room temperature. Chemical conditions for producing polyphosphoric acid through polymerization in the method are not limited to pressure, thus broadening the selection range of manufacturing devices, and achieving approach diversification.

Description

technical field [0001] The invention belongs to the field of compound fertilizer production, and in particular relates to a method for preparing polyphosphate-containing compound fertilizer by decomposing phosphate rock with nitric acid. Background technique [0002] CN200780044974.8 discloses a method of producing polyphosphate-containing NPK or NP materials with the nitrophosphate method, the method reduces the pressure of the evaporation step and / or increases the temperature of the evaporation step and / or controls the temperature of the crystallization step, so that the The material contains a mixture of MAP, DAP, DCP and optional apatite, and a controlled amount of condensed phosphate (polyphosphate), and the N / P and Ca / P ratio of the NPK material is N / P≥0.95 , 1.0≥Ca / P≥0.2, and the products obtained by this method. [0003] Also disclose the method for preparing nitrophosphate fertilizer simultaneously as figure 1 , comprising the following steps: (1) digesting apatit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/38C01B25/40C05G1/06
CPCC01B25/40C01F11/38C05B17/00C05C1/00
Inventor 詹光健褚红艳赵国军
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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