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Di-ammonium phosphate produced by wet process phosphoric acid and production method of di-ammonium phosphate

A technology of diammonium phosphate and wet-process phosphoric acid, which is applied in the direction of ammonium orthophosphate fertilizer, phosphate, phosphorus oxyacid, etc., can solve the problems of unsatisfactory market demand and difficult control of impurity content, and achieve significant environmental protection value and economic benefits , increase yield, increase the effect of available phosphorus content

Active Publication Date: 2015-03-11
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional diammonium phosphate production method is to use wet-process phosphoric acid to directly react with ammonia, and adjust the total nutrient by controlling the molar ratio of ammonia and phosphoric acid. The content of impurities such as phosphorus and fluorine is difficult to control and cannot meet market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A diammonium phosphate produced by wet process phosphoric acid, the fluorine content of the diammonium phosphate is 0.57%.

[0028] The production method of the diammonium phosphate that this utilizes wet-process phosphoric acid to produce may further comprise the steps:

[0029] (1) Pre-neutralization: place phosphoric acid in the pre-neutralization tank, pass ammonia gas into it, and adopt the method of stirring while passing in, and the stirring speed during stirring is 40r / min, and when it is passed into When the molar ratio of ammonia gas to phosphoric acid is 0.5, continue to maintain the stirring speed for 15 minutes, and carry out the temperature rise treatment on the pre-neutralization tank, the temperature rise rate is 0.4°C / min temperature rise treatment, and adjust the neutralization degree to be maintained at 0.5, stop Heating treatment to obtain a solid-liquid mixture for use;

[0030] (2) Separation: Place the solid-liquid mixture obtained in step 1) in ...

Embodiment 2

[0037] A diammonium phosphate produced by wet process phosphoric acid, the fluorine content of the diammonium phosphate is 0.4%.

[0038] The production method of the diammonium phosphate produced by wet-process phosphoric acid may further comprise the steps:

[0039] (1) Pre-neutralization: Place phosphoric acid in the pre-neutralization tank, pass ammonia gas into it, and adopt the method of stirring while passing in, and the stirring speed during stirring is 60r / min. When the molar ratio of ammonia gas to phosphoric acid is 0.7, continue to maintain the stirring speed for 25 minutes, and carry out temperature rise treatment on the pre-neutralization tank, the temperature rise rate is 0.5 ℃ / min temperature rise treatment, and adjust the neutralization degree to maintain 0.8, stop Heating treatment to obtain a solid-liquid mixture for use;

[0040] (2) Separation: Place the solid-liquid mixture obtained in step 1) in a centrifuge for centrifugation. The rotating speed of the...

Embodiment 3

[0047] A diammonium phosphate produced by wet process phosphoric acid, the fluorine content of the diammonium phosphate is 0.71%.

[0048] The production method of the diammonium phosphate that this utilizes wet-process phosphoric acid to produce may further comprise the steps:

[0049] (1) Pre-neutralization: Place phosphoric acid in the pre-neutralization tank, pass ammonia gas into it, and adopt the method of stirring while passing in, and the stirring speed during stirring is 50r / min. When the molar ratio of ammonia gas to phosphoric acid is 0.6, continue to maintain the stirring speed for 20 minutes, and carry out the temperature rise treatment on the pre-neutralization tank, the temperature rise rate is 0.45°C / min, and adjust the neutralization degree to be maintained at 0.6, stop Heating treatment to obtain a solid-liquid mixture for use;

[0050] (2) Separation: Place the solid-liquid mixture obtained in step 1) in a centrifuge for centrifugation. The rotating speed o...

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Abstract

The invention relates to the technical field of di-ammonium phosphate produced by wet process phosphoric acid, in particular to di-ammonium phosphate produced by wet process phosphoric acid and a production method of the di-ammonium phosphate. Ammonia is added into wet process phosphoric acid, and the molar ratio of ammonia and total phosphoric acid is controlled to enable the neutralization degree to be 0.5-0.8; impurities in the wet process phosphoric acid can produce a deposit together with phosphoric acid, fluorine and the like, so that wet process phosphoric acid is purified to a certain degree, the phenomenon of relatively low available phosphate content caused by the deposit produced by the impurities in the prepared di-ammonium phosphate, phosphoric acid and fluorine, the quality of di-ammonium phosphate is further improved, the available phosphate content accounts for 92-96% of the total phosphorus content in di-ammonium phosphate, and the content of fluorine in di-ammonium phosphate is reduced to 0.4-0.71%.

Description

technical field [0001] The invention relates to the technical field of diammonium phosphate produced by wet-process phosphoric acid, in particular to a diammonium phosphate produced by wet-process phosphoric acid and a production method thereof. Background technique [0002] Diammonium phosphate is a high-concentration compound fertilizer, which is widely used in fertilizing various plants because of its high nutrient content. With the continuous development of agricultural technology, people have a deeper understanding of the growth mechanism of plants, and the requirements for fertilizer efficiency and impurity content are getting higher and higher. Now some customers not only require the total nutrients of fertilizer grade DAP to meet the standard, but also require water-soluble phosphorus to account for more than 90% of the total phosphorus, and the fluorine content should not exceed 1%. The traditional diammonium phosphate production method is to use wet-process phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05B7/00
Inventor 廖吉星陈彬朱飞武彭宝林周勇
Owner GUIZHOU KAILIN GRP CO LTD
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