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A method for preparing potassium dihydrogen phosphate and by-product special fertilizer for dragon fruit

A technology of potassium dihydrogen phosphate and dragon fruit, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the waste of potassium dihydrogen phosphate, the low purity of potassium dihydrogen phosphate, and the introduction of a large amount of impurities into potassium dihydrogen phosphate products. and other problems, to achieve the effect of reducing production costs, significant economic benefits, significant environmental protection value and economic benefits

Inactive Publication Date: 2016-08-24
GUIZHOU UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a method for preparing potassium dihydrogen phosphate and by-product dragon fruit special fertilizer, so as to solve the problem of a large amount of dihydrogen phosphate caused by incomplete crystallization of potassium dihydrogen phosphate in the process of preparing potassium dihydrogen phosphate products. The waste of potassium hydrogen phosphate, excessive crystallization of potassium dihydrogen phosphate will bring a lot of impurities into the product of potassium dihydrogen phosphate, and then make the technical problem of low purity of potassium dihydrogen phosphate product

Method used

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  • A method for preparing potassium dihydrogen phosphate and by-product special fertilizer for dragon fruit
  • A method for preparing potassium dihydrogen phosphate and by-product special fertilizer for dragon fruit
  • A method for preparing potassium dihydrogen phosphate and by-product special fertilizer for dragon fruit

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Embodiment 1

[0041] A method for preparing potassium dihydrogen phosphate and by-product special fertilizer for dragon fruit. Phosphoric acid and carbonamide are mixed in a reaction kettle at a molar ratio of 1.1:1, and then the temperature of the two mixtures is raised at a heating rate of 5°C / min. High to 100°C, stirred for 120min, then cooled to 30°C at a rate of 3°C / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and basic potassium salt were added at a molar ratio of 1:0.9 Mix the reaction in the reactor, adjust the pH value of the reaction to be 8, and stir the reaction for 60 minutes at a stirring speed of 200r / min. After the reaction is over, obtain a slurry containing nitrogen, phosphorus and potassium, and place the slurry in a cooling crystallizer for circulation Crystallization treatment, detection and analysis of the filtrate at the same time, when the nitrogen content in the filtrate is 20%, the phosphorus pentoxide content is 5%, and the ...

Embodiment 2

[0044] The method for preparing potassium dihydrogen phosphate and producing dragon fruit special fertilizer by-product is to add phosphoric acid and carbonamide into the reactor and mix them in a molar ratio of 1.3:1, and then raise the temperature of the two mixtures to Stir at 120°C for 100 minutes, then cool the temperature to 45°C at a rate of 3°C / min, and then centrifuge to obtain the urea phosphate intermediate; add the intermediate and basic potassium salt to the reaction at a molar ratio of 1:1.1 Mixing reaction in the kettle, the pH value of the adjustment reaction is 9, the stirring speed is 250r / min stirring reaction 40min, after the reaction finishes, obtain the slurry containing nitrogen, phosphorus and potassium, and place the slurry in a cooling crystallizer for circulation crystallization treatment, Detect and analyze the filtrate simultaneously, when the nitrogen content in the filtrate is 24%, the phosphorus pentoxide content is 7%, and the potassium oxide co...

Embodiment 3

[0047] The method for preparing potassium dihydrogen phosphate and producing dragon fruit special fertilizer by-product is to add phosphoric acid and carbonamide into the reactor and mix them in a molar ratio of 1.2:1, and then raise the temperature of the two mixtures to Stir at 110°C for 110 minutes, then cool the temperature to 40°C at a rate of 3°C / min, and then centrifuge to obtain the urea phosphate intermediate; add the intermediate and basic potassium salt to the reaction at a molar ratio of 1:1 Mix the reaction in the still, adjust the pH value of the reaction to be 8.5, and the stirring speed is 220r / min stirring reaction for 50min. Detect and analyze the filtrate. When the nitrogen content in the filtrate is 22%, the phosphorus pentoxide content is 6%, and the potassium oxide content is 3, stop crystallization and filter, and the filter cake is potassium dihydrogen phosphate product; add CaSO in the filtrate 4 , MgSO 4 , ZnSO 4 , Fe 2 + Chelates, H 3 BO 3 A va...

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Abstract

The invention relates to the technical field of chemical industry, and discloses a method for simultaneously preparing potassium dihydrogen phosphate and a special fertilizer for pitaya. The method comprises the following steps: reacting phosphoric acid with carbomite to prepare an intermediate, reacting the intermediate with an alkaline potassium salt to prepare potassium dihydrogen phosphate, controlling the content ratio of nutrients in a filtrate in the potassium dihydrogen phosphate crystallizing process, and adding trace element compounds to the potassium dihydrogen phosphate separated filtrate in order to prepare the special fertilizer for pitaya. The method improves the purity of potassium dihydrogen phosphate, and a small dose of the special fertilizer for pitaya, prepared by analyzing the ratio of the nutritional elements required in the growth process of pitaya, is applied to achieve a large output of pitaya.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing potassium dihydrogen phosphate and producing a special fertilizer for dragon fruit by-product. Background technique [0002] Potassium dihydrogen phosphate can be used in industry, agriculture and other fields, and has a wide range of uses. For example, in the industry, it is mainly used as the production of chemical raw materials, and in agriculture, it is mainly used for the addition of feed and chemical fertilizers. In addition, potassium dihydrogen phosphate can also be used as a raw material for food to improve the taste and quality of food, and to supplement the human body. Potassium and other medium and trace elements. At present, the production methods of potassium dihydrogen phosphate mainly include neutralization method, extraction method, ion exchange method, double decomposition method, crystallization method and electrolysis method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 陈肖虎廖吉星高贵龙郑超李军旗韩朝应薛涛王先炜黄芳金会心
Owner GUIZHOU UNIV
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