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Production method for preparing dipotassium hydrogen phosphate and by-product special fertilizer for plum trees

A technology of dipotassium phosphate and production method, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of low purity of dipotassium phosphate and unavailability of effective components in filtrate, and achieve the effect of good absorption rate

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

[0009] The present invention aims at the production process of dipotassium phosphate by wet-process phosphoric acid, the purity of dipotassium phosphate is not high, and the filtrate also contains a large amount of unseparated urea, 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 the traditional plum blossom tree special fertilizer and the absorption situation of the plum blossom tree from a large amount of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid from wet process. The special fertilizer for plum tree is produced from the filtrate of dipotassium phosphate, which solves the problems that the purity of dipotassium phosphate produced by wet process phosphoric acid is not high, and the active ingredients in the filtrate cannot be used. At the same time, the special fertilizer has a good absorption rate and a controllable release effect. In domestic fertilizer production, there is no report

Method used

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  • Production method for preparing dipotassium hydrogen phosphate and by-product special fertilizer for plum trees
  • Production method for preparing dipotassium hydrogen phosphate and by-product special fertilizer for plum trees
  • Production method for preparing dipotassium hydrogen phosphate and by-product special fertilizer for plum trees

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Effect test

Embodiment 1

[0057] A kind of production method of preparing dipotassium phosphate by-product plum tree special fertilizer provided by the present embodiment mainly comprises the following steps:

[0058] 1) Mix phosphoric acid and urea at a molar ratio of 1.2:1, raise the temperature from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and hydrogen The potassium oxide solution is mixed according to the molar ratio of 1:1.4, and the pH value is adjusted to 8.5. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in a cooling crystallizer Cool down to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is a dipotassium phosphate product, and detect the component content in...

Embodiment 2

[0065] A kind of production method of preparing dipotassium phosphate by-product plum tree special fertilizer provided by the present embodiment mainly comprises the following steps:

[0066] 1) Mix phosphoric acid and urea at a molar ratio of 1.5:1, raise the temperature from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and hydrogen The potassium oxide solution is mixed according to the molar ratio of 1:1.1, and the pH value is adjusted to 8.5. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in a cooling crystallizer Cool down to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is a dipotassium phosphate product, and detect the component content in...

Embodiment 3

[0073] A kind of production method of preparing dipotassium phosphate by-product plum tree special fertilizer provided by the present embodiment mainly comprises the following steps:

[0074] 1) Mix phosphoric acid and urea at a molar ratio of 1.3:1, raise the temperature from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and hydrogen The potassium oxide solution is mixed according to the molar ratio of 1:1.3, and the pH value is adjusted to 8.7. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in a cooling crystallizer Lower the temperature to 35-40°C in the middle, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, the obtained filter cake is dipotassium phosphate product, and detect ...

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Abstract

The invention relates to the field of chemical technique, especially to a production method for preparing dipotassium hydrogen phosphate and a by-product a special fertilizer for plum trees. By changing coefficients such as temperature and the like of wet-process phosphoric acid preparation of dipotassium hydrogen phosphate, purity of the product dipotassium hydrogen phosphate is raised, a compound fertilizer containing N, P and K combined forms can simultaneously be produced, and formaldehyde is added into a filtrate to prepare a controlled-release compound fertilizer. By the method, purity of dipotassium hydrogen phosphate can be raised, and the produced special fertilizer for plum trees has good absorptivity. Meanwhile, the produced special fertilizer for plum trees can meet nutritional requirements of each period of growth cycle of plum trees, and 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 dipotassium phosphate by-product special fertilizer for plum blossom trees. Background technique [0002] Dipotassium phosphate is widely used in almost all types of crops such as various types of economic crops, grain, melons and fruits, vegetables, etc. It is a new high-concentration phosphorus and potassium two-element compound fertilizer to overcome the nutritional deficiency caused by the aging and absorption capacity of the root system in the later stage of crop growth. It is an efficient phosphorus and potassium compound fertilizer in agriculture. At present, many domestic fertilizer manufacturers are producing dipotassium phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, double decomposition method, direct method, crystallization method and electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 陈肖虎廖吉星高贵龙朱飞武李军旗彭宝林薛涛赵井腥王帅帅李名新
Owner GUIZHOU UNIV
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