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Method for preparing monocalcium phosphate and fertilizer for garlic

A technology of calcium dihydrogen phosphate and special fertilizer, applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc. Large, low purity calcium dihydrogen phosphate products, etc., to achieve significant environmental value, significant economic value, low phosphorus recovery effect

Inactive Publication Date: 2015-01-21
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a method for preparing calcium dihydrogen phosphate and by-product special fertilizer for garlic, so as to solve the problem that the matching of nutrient elements in the existing fertilizer does not meet the ratio of garlic's demand for nutrient elements, which leads to garlic The applied fertilizers are less absorbed by garlic, and some elemental compounds remain in the soil, changing the structure of the soil and polluting the environment
At the same time, it solves the waste of a large amount of calcium dihydrogen phosphate that will be caused by incomplete crystallization of calcium dihydrogen phosphate in the process of preparing calcium dihydrogen phosphate products, and excessive crystallization of calcium dihydrogen phosphate will bring the A large number of impurities, which in turn makes the technical problem of low purity of calcium dihydrogen phosphate products

Method used

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  • Method for preparing monocalcium phosphate and fertilizer for garlic
  • Method for preparing monocalcium phosphate and fertilizer for garlic
  • Method for preparing monocalcium phosphate and fertilizer for garlic

Examples

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Embodiment 1

[0042] A method for preparing calcium dihydrogen phosphate and by-product special fertilizer for garlic, comprising the steps of:

[0043] (1) Preparation of intermediate: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 100°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 180 minutes of reaction, cool down the temperature After crystallization at 20°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.1:1;

[0044] (2) Preparation of calcium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with calcium hydroxide at a molar ratio of 1:0.6 for 60 minutes, and control the addition speed of calcium hydroxide The reaction temperature is 50°C, and the pH value is adjusted to 8.5. After the reaction is completed, the obtained slurry is added to a cooling crystallizer to circulate crystallization,...

Embodiment 2

[0047] A method for preparing calcium dihydrogen phosphate and by-product special fertilizer for garlic, comprising the following steps:

[0048] (1) Preparation of intermediate: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 150°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 200 minutes of reaction, cool down the temperature After crystallization at 45°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.3:1;

[0049] (2) Preparation of calcium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with calcium hydroxide at a molar ratio of 1:0.9 for 60 minutes, and control the addition speed of calcium hydroxide The reaction temperature is 70°C, and the pH value is adjusted to 9.5. After the reaction is completed, the obtained slurry is added to the cooling crystallizer to circulate crystal...

Embodiment 3

[0052] A method for preparing calcium dihydrogen phosphate and by-product special fertilizer for garlic, comprising the following steps:

[0053] (1) Preparation of intermediates: first add phosphoric acid to the synthesis tank, then raise the temperature of phosphoric acid to 130°C, then add carbonamide to the synthesis tank to make it react with phosphoric acid, after 190 minutes of reaction, cool down the temperature After crystallization at 30°C, centrifuge to obtain the intermediate, the molar ratio of phosphoric acid to carbonamide is 1.2:1;

[0054] (2) Preparation of calcium dihydrogen phosphate: send the intermediate obtained in step (1) into the synthesis tank, mix and react with calcium hydroxide at a molar ratio of 1:0.7 for 50 minutes, and control the addition speed of calcium hydroxide The reaction temperature is 60°C, and the pH value is adjusted to 9. After the reaction is completed, the obtained slurry is added to the cooling crystallizer to circulate crystall...

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Abstract

The invention relates to the technical field of chemical engineering, and discloses a method for preparing monocalcium phosphate and a fertilizer for garlic. The method comprises the following steps: carrying out reaction on phosphoric acid and carbamide to generate a midbody, carrying out reaction on the midbody and alkali calcium salt to generate monocalcium phosphate, analyzing the amounts of various nutrient elements required for the garlic growth through researching the amounts of the nutrient elements absorbed by the garlic from the soil, and preparing the fertilizer for garlic by utilizing the waste liquor obtained by producing the monocalcium phosphate. According to the method, the raw materials are fully utilized, the produced monocalcium phosphate is relatively good in quality and the prepared fertilizer for garlic is relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing calcium dihydrogen phosphate and by-product special fertilizer for garlic. Background technique [0002] Calcium dihydrogen phosphate is an inorganic compound, which is a colorless triclinic flake, granular or crystalline powder, widely used as a feed additive for aquaculture animals and livestock and poultry animals, as a leavening agent, dough conditioner, buffer Agents, nutritional supplements, emulsifiers, stabilizers and other quality improvers. Calcium dihydrogen phosphate can improve the complexed metal ions of food, pH value, increase ionic strength, etc., and can improve the adhesion and water holding capacity of food. Used in flour, cakes, pastries, baked products, fried foods, biscuits, milk powder, cold drinks, ice cream, etc. my country stipulates that for bread, biscuits, and baking powder, the maximum usage amount is 4.0g / kg (calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05G1/00C05B7/00
Inventor 陈肖虎廖吉星唐晓宁彭宝林何敏朱飞武高贵龙周宾薛涛赵伟毅
Owner GUIZHOU UNIV
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