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Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for peony as byproduct

A production method and technology of calcium hydroxide, applied in chemical instruments and methods, phosphorus compounds, applications, etc., can solve the problems of unavailability of active ingredients in filtrate, low purity of potassium dihydrogen phosphate, etc., so as to improve the quality of peony and reduce planting. cost, the effect of increasing element content

Inactive Publication Date: 2015-01-28
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] 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 tree peony special fertilizer and the absorption of tree peony from a large number 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 peony is prepared 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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  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for peony as byproduct
  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for peony as byproduct
  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for peony as byproduct

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A kind of production method of preparing potassium dihydrogen phosphate by-product peony special fertilizer provided by this embodiment mainly includes the following steps:

[0065] 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 down the temperature in 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 detect the component c...

Embodiment 2

[0075] A kind of production method of preparing potassium dihydrogen phosphate by-product peony special fertilizer provided by this embodiment mainly includes the following steps:

[0076] 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 down the temperature in 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 detect the component c...

Embodiment 3

[0086] A kind of production method of preparing potassium dihydrogen phosphate by-product peony special fertilizer provided by this embodiment mainly includes the following steps:

[0087] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.3:1, and 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 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 down the temperature in 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 dete...

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Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing potassium dihydrogen phosphate and preparing a special fertilizer for peony as a byproduct. The temperature and other coefficients of the preparation technology of potassium dihydrogen phosphate from phosphoric acid through a wet process are changed, so the purity of the potassium dihydrogen phosphate product is improved, and the N, P and K compounded fertilizer is produced; and formaldehyde is added to a filtrate to prepare the controlled release compound fertilizer. The method improves the purity of potassium dihydrogen phosphate, and the produced special fertilizer for peony has high absorptivity, can meet the nutrition needs of peony in all stages of the growth period of peony, 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 potassium dihydrogen phosphate by-product tree peony special fertilizer. 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, direct method,...

Claims

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Application Information

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IPC IPC(8): C01B25/32C05G1/00
Inventor 陈肖虎廖吉星高贵龙杨勇何敏谢飞王丽远石磊黄芳金会心
Owner GUIZHOU UNIV
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