Production method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for chive

A technology of ammonium dihydrogen phosphate and its production method, which is applied to ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, phosphate fertilizers, etc., can solve problems such as low purity of ammonium dihydrogen phosphate and unusable active ingredients in the filtrate, and achieve Good absorption rate, effect of increasing element content

Inactive Publication Date: 2015-02-04
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In the process of producing ammonium dihydrogen phosphate from wet-process phosphoric acid, the purity of ammonium dihydrogen phosphate is not high, and the filtrate also contains a large amount of unprecipitated carbonamide, K + 、H 2 PO 4 - 、HPO 4 2- 、PO 4 3- and other substances, the researchers of the present invention have studied the composition content of traditional shallot special fertilizer and the absorption situation of shallot from a large amount of prior art documents and many years of exploration and research, and have effectively explored the production of phosphoric acid from wet process. The special fertilizer for chives is produced from the filtrate of ammonium dihydrogen phosphate, which solves the problems of low purity of ammonium dihydrogen phosphate produced by wet process phosphoric acid and unusable active ingredients in the filtrate. At the same time, the special fertilizer has good absorption rate and controlled release Effect, in the domestic fertilizer production, there is no report

Method used

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  • Production method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for chive
  • Production method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for chive
  • Production method for preparing ammonium dihydrogen phosphate and by-product special fertilizer for chive

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Effect test

Embodiment 1

[0054] A kind of production method of preparing ammonium dihydrogen phosphate by-product shallot special fertilizer provided by this embodiment mainly comprises the following steps:

[0055] 1) Phosphoric acid and carbonamide are mixed, the molar ratio of phosphoric acid and carbonamide is 1.2:1, and the temperature is raised from 80°C to 160°C at a heating rate of 3-8°C / min, stirred and reacted for 4-5h, and separated to obtain Intermediate, then add the intermediate to the ammonia solution, the molar ratio of the intermediate to the ammonia water is 1:1.4, adjust the temperature to 50-65°C, stir and react for 2-3 hours, after the reaction, carry out cooling crystallization and filtration treatment, the crystallization temperature The temperature is 30-35°C, and the filtrate is circulated and crystallized in the cooling crystallizer, and the obtained filter cake is ammonium dihydrogen phosphate product, and the component content in the filtrate is detected;

[0056] 2) add po...

Embodiment 2

[0061] A kind of production method of preparing ammonium dihydrogen phosphate by-product shallot special fertilizer provided by this embodiment mainly comprises the following steps:

[0062] 1) Phosphoric acid and carbonamide are mixed, the molar ratio of phosphoric acid and carbonamide is 1.5:1, and the temperature is raised from 80°C to 160°C at a heating rate of 3-8°C / min, stirred for 4-5h, and separated to obtain Intermediate, then add the intermediate to the ammonia solution, the molar ratio of the intermediate to the ammonia water is 1:1.2, adjust the temperature to 50-65°C, stir and react for 2-3 hours, after the reaction, carry out cooling crystallization and filtration treatment, the crystallization temperature The temperature is 30-35°C, and the filtrate is circulated and crystallized in the cooling crystallizer, and the obtained filter cake is ammonium dihydrogen phosphate product, and the component content in the filtrate is detected;

[0063] 2) add potassium hydr...

Embodiment 3

[0068] A kind of production method of preparing ammonium dihydrogen phosphate by-product shallot special fertilizer provided by this embodiment mainly comprises the following steps:

[0069] 1) Phosphoric acid and carbonamide are mixed, the molar ratio of phosphoric acid and carbonamide is 1.3:1, and the temperature is raised from 80°C to 160°C at a heating rate of 3-8°C / min, stirred and reacted for 4-5h, and separated to obtain Intermediate, then add the intermediate to the ammonia solution, the molar ratio of the intermediate to the ammonia water is 1:1.3, adjust the temperature to 50-65°C, stir and react for 2-3 hours, after the reaction, carry out cooling crystallization and filtration treatment, the crystallization temperature The temperature is 30-35°C, and the filtrate is circulated and crystallized in the cooling crystallizer, and the obtained filter cake is ammonium dihydrogen phosphate product, and the component content in the filtrate is detected;

[0070] 2) add po...

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Abstract

The invention relates to the field of chemical technique, especially to a production method for preparing ammonium dihydrogen phosphate and a by-product a special fertilizer for chive. By changing coefficients such as temperature and the like of wet-process phosphoric acid preparation of ammonium dihydrogen phosphate, purity of the product ammonium dihydrogen phosphate is raised, and a compound fertilizer containing N, P and K combined forms can simultaneously be produced. By the method, purity of ammonium dihydrogen phosphate can be raised, and the produced special fertilizer for chive has good absorptivity. Meanwhile, the produced special fertilizer for chive can meet nutritional requirements of each period of growth cycle of chive. By the use of the compound fertilizer, yield of chive is raised greatly. The special fertilizer is an efficient compound fertilizer.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing ammonium dihydrogen phosphate by-product shallot special fertilizer. Background technique [0002] Ammonium dihydrogen phosphate is widely used in almost all types of crops such as various types of economic crops, grain, melons and fruits, vegetables, etc. It has the effect of overcoming the nutrient deficiency caused by the aging and absorption capacity of the root system in the later stage of crop growth. It is a new type of high-concentration phosphorus and potassium two-element compound fertilizer, and it is an efficient phosphorus and potassium compound fertilizer in agriculture. At present, many domestic fertilizer manufacturers are producing ammonium dihydrogen phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, metathesis method, direct method, cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05G1/00C05B7/00
Inventor 陈肖虎廖吉星李军旗石秀明何敏朱飞武赵伟毅周勇曾舒金会心
Owner GUIZHOU UNIV
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