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Method for producing compound fertilizer containing nitrate nitrogen potassium sulphate

A technology of potassium sulfate type and production method, applied in fertilization equipment, fertilizer mixture, application, etc., can solve the problems of inconvenient increase of nitrate nitrogen, prone to explosion, and limitation of addition amount, and achieve new sales points, easy to dissolve , good moisture control effect

Active Publication Date: 2014-09-10
山东聊城鲁西化工第五化肥有限公司
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AI Technical Summary

Problems solved by technology

[0002] The well-known traditional production method of chemical synthesis spray granulation compound fertilizer is to use mixed acid and pure gas ammonia to react in a neutralization tank or a tubular reactor to form a slurry, and further produce compound fertilizer. The compound fertilizer produced is mainly Containing ammoniacal nitrogen, the dissolution is slow and the utilization rate is low; while the nitro compound fertilizer produced by adding nitrate nitrogen to the slurry is easy to dissolve in water and is used to supplement agricultural "nitrogen" elements. It is a crop production and can prolong The growth and harvest periods of crops play a vital role in the growth of crops; adding nitric acid to mixed acid to obtain nitrate nitrogen is unsafe, prone to explosion, and the amount of addition is limited, which is not convenient for nitrate nitrogen The ammonium nitrate phosphorus composition is stable and easy to dissolve, which can increase the nitrate nitrogen content in nitrogen to 9% to 16%, meeting the needs of nitro compound fertilizer production

Method used

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  • Method for producing compound fertilizer containing nitrate nitrogen potassium sulphate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of production method that contains nitrate nitrogen potassium sulfate type compound fertilizer, as figure 1 As shown, it is achieved through the following steps:

[0027] (1) Preparation of ammonium nitrate slurry: Dissolve nitrate with condensed water at 60°C or compound fertilizer tail gas washing liquid. When the temperature of the slurry cannot be reached, use low-pressure steam to heat it. The low-pressure steam is controlled at 0.1MPa. The slurry temperature is controlled at 50-70°C, and the specific gravity of the ammonium nitrate slurry is 1.35g / ml;

[0028] (2) Preparation of mixed acid: the sulfuric acid solution with a mass fraction of 98% from the circulation tank of the sulfuric acid workshop is controlled at a temperature between 80 and 90°C. The sulfuric acid pump measures the sulfuric acid solution through a flow meter and sends it to a plate heater, which is heated by steam. Enter the conversion tank after request;

[0029] Potass...

Embodiment 2

[0042] The difference between this embodiment and tool embodiment 1 is:

[0043] In the step (1), the low-pressure steam is controlled at 0.3Mpa; the ammonium nitrate-phosphorus slurry specific gravity is 1.45g / ml;

[0044] In step (2), the specific gravity of phosphoric acid is 1.23g / ml, and the material ratio 1T of potassium chloride, sulfuric acid, phosphoric acid: 0.82m 3 : 3.5m 3 ;

[0045] The mass ratio of the neutralized slurry to the ammonium nitrate slurry in step (4) is 1:0.16.

[0046] Gained nitrogen (N) content is 13.18% in the potassium sulfate type compound fertilizer containing nitrate nitrogen, wherein, ammoniacal nitrogen 11.19%, nitrate nitrogen 1.99%, nitrate nitrogen content reaches 15.10% in the nitrogen element, phosphorus content (with effective P 2 o 5 Calculated) is 17.52%, potassium content (in K 2 O) is 13.52%.

Embodiment 3

[0048] The difference between this embodiment and embodiment 1 is:

[0049] In the step (1), the low-pressure steam is controlled at 0.6Mpa; the specific gravity of the ammonium nitrate slurry is 1.40g / ml;

[0050] In step (2), the specific gravity of phosphoric acid is 1.25g / ml, and the material ratio 1T of potassium chloride, sulfuric acid, phosphoric acid: 0.85m 3 : 3.6m 3 ;

[0051] In step (4), the mass ratio of the neutralized slurry to the ammonium nitrate slurry is 1:0.13.

[0052] Gained nitrogen (N) content is 13.10% in the potassium sulfate type compound fertilizer containing nitrate nitrogen, wherein, ammoniacal nitrogen 11.52%, nitrate nitrogen 1.58%, nitrate nitrogen content reaches 12.06% in the nitrogen element, phosphorus content (with effective P 2 o 5 Calculated) is 17.96%, potassium content (in K 2 O) 13.61%.

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Abstract

The invention discloses a method for producing a compound fertilizer containing nitrate nitrogen potassium sulphate. The method is achieved by the following steps: (1) preparing ammonium nitrate phosphorus slurry, namely dissolving ammonium nitrate phosphorus by using condensate water at 50-80 DEG C or compound fertilizer exhaust washing liquor; (2) preparing a mixed acid, namely enabling a sulfuric acid solution to react with potassium chloride in a transfer tank to generate potassium hydrogen sulfate, overflowing KHSO4 generated by reaction and excessive H2SO4 solution to a mixed acid geosyncline, and mixing with a phosphoric acid solution which is metered by an ultraphosphate flow meter to generate the mixed acid; (3) carrying out neutral reaction on gas ammonia and mixed acid in a reactor, so as to obtain neutral slurry; (4) mixing the neutral slurry with the ammonium nitrate phosphorus slurry in a feeder trough to form mixed slurry; and (5) spraying the mixed slurry into a pelletizer, so as to obtain the compound fertilizer containing nitrate nitrogen potassium sulphate. The usage of steam is saved, the compound fertilizer particle is good in smoothness, and uniform in granularity, the whiteness is improved, the moisture is well controlled, the utilization rate of the fertilizer is improved, the soil contamination is reduced, and healthy growth of the plant is promoted.

Description

technical field [0001] The invention relates to a production method of compound fertilizer, in particular to a production method of nitrate nitrogen-containing potassium sulfate type compound fertilizer. Background technique [0002] The well-known traditional production method of chemical synthesis spray granulation compound fertilizer is to use mixed acid and pure gas ammonia to react in a neutralization tank or a tubular reactor to form a slurry, and further produce compound fertilizer. The compound fertilizer produced is mainly Containing ammoniacal nitrogen, the dissolution is slow and the utilization rate is low; while the nitro compound fertilizer produced by adding nitrate nitrogen to the slurry is easy to dissolve in water and is used to supplement agricultural "nitrogen" elements. It is a crop production and can prolong The growth and harvest periods of crops play a vital role in the growth of crops; adding nitric acid to mixed acid to obtain nitrate nitrogen is un...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 王汝申
Owner 山东聊城鲁西化工第五化肥有限公司
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