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A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer

A technology of potassium dihydrogen phosphate and by-product green onions, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of stagnation, soil compaction, and low purity of potassium dihydrogen phosphate, and achieve good absorption rate and reduce planting. Cost and effect of improving the quality of green onions

Inactive Publication Date: 2017-02-15
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The unabsorbed mixed fertilizer is easy to cause soil compaction. At the same time, the release and loss of the mixed fertilizer is too fast, which will cause the scallions to grow wildly in the early stage. In the later stage, the scallions will grow wildly and the nutrients in the soil will not be able to supply the scallions due to rainwater soaking or fertilizer self-decomposition. needs, causing the growth of scallions to slow down or stop
[0014] In the process of producing potassium dihydrogen phosphate from wet-process phosphoric acid, the purity of potassium 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 scallion special fertilizer and the absorption situation of scallions from a large amount of prior art documents and years of exploration and research, and have effectively explored the production of phosphoric acid diphosphate from wet-process phosphoric acid. The special fertilizer for scallions is produced from the filtrate of potassium hydrogen phosphate, which solves the problems of low purity of potassium 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 controllable release effect. Domestic fertilizer production, no report

Method used

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  • A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer
  • A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer
  • A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer

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Embodiment 1

[0062] A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer provided by this embodiment mainly comprises the following steps:

[0063] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.5:1, heat up 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 The basic potassium salt is mixed according to the molar ratio of 1:1.1, and the pH value is adjusted to 8.5-9.0. 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 cooling Cool the crystallizer 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 potassium dihydrogen phosphate product, and the component content in the filtrate i...

Embodiment 2

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

[0069] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.2:1, heat up 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 The basic potassium salt is mixed according to the molar ratio of 1:1.4, and the pH value is adjusted to 8.5-9.0. 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 cooling Cool the crystallizer 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 potassium dihydrogen phosphate product, and the component content in the filtrate i...

Embodiment 3

[0074] A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer provided by this embodiment mainly comprises the following steps:

[0075] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.4:1, heat up 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 The basic potassium salt is mixed according to the molar ratio of 1:1.3, and the pH value is adjusted to 8.5-9.0. 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 cooling Cool the crystallizer 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 potassium dihydrogen phosphate product, and the component content in the filtrate i...

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Abstract

The invention relates to the technical field of chemical industry, and in particular to a production method of monopotassium phosphate with a by-product welsh onion special fertilizer. Coefficients such as temperature in a wet process for preparation of monopotassium phosphate are changed to improve the purity of monopotassium phosphate product and to produce a compound fertilizer containing N, P and K in combined state; and a filtrate is adjusted into an acidic state, and is added into a formaldehyde solution to prepare a controlled release compound fertilizer. The method can improve the purity of monopotassium phosphate, besides the produced welsh onion special fertilizer has good absorption rate; and the produced welsh onion special fertilizer meets the nutritional needs of each period in the growth cycle, greatly increases welsh onion yield, and is a high 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 special fertilizer for green onions by-product of potassium dihydrogen phosphate. Background technique [0002] Potassium 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 potassium dihydrogen phosphate compound fertilizer. The production methods mainly include neutralization method, extraction method, ion exchange method, metathesis method, direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 陈肖虎廖吉星何敏周勇赵伟毅蔺忠建曾舒杨勇黄芳金会心
Owner GUIZHOU UNIV
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