Preparation method of special fertilizer for cotton

A special cotton fertilizer and preparation method technology, applied in the direction of chemical instruments and methods, application, phosphate fertilizer, etc., can solve the problems of changing soil structure, high labor intensity, etc., and achieve the effects of less fertilizer input, low production cost, and significant environmental protection value

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

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a preparation method of special fertilizer for cotton, to solve the problem in the prior art that the labor intensity is high when fertilizing cotton, and the applied fertilizer remains in the soil to change the soil structure, causing soil compaction. Deficiencies

Method used

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  • Preparation method of special fertilizer for cotton
  • Preparation method of special fertilizer for cotton
  • Preparation method of special fertilizer for cotton

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of special fertilizer for cotton, adding phosphoric acid and carbonamide into the reactor at a molar ratio of 1.2:1 and mixing them, then raising the temperature of the two mixtures to 120°C at a heating rate of 4°C / min, stirring and reacting 130min, the temperature was cooled to 30°C and then centrifuged to obtain the intermediate; the intermediate and sodium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:0.9, and the stirring speed was 220r / min for 70min. The reaction temperature is 60°C, and the pH value of the reaction is adjusted to 8. After the reaction is completed, a slurry containing nitrogen and phosphorus is obtained, and the slurry is placed in a cooling crystallizer and cooled to 30°C for cyclic crystallization treatment, and the filtrate is detected and analyzed at the same time. When the nitrogen content in the filtrate was 9%, and the phosphorus content was 2.8%, stop crystallization and filter, and the filter c...

Embodiment 2

[0043] A preparation method of special fertilizer for cotton. Phosphoric acid and carbonamide are added into the reactor at a molar ratio of 1.4:1 and mixed, then the temperature of the two mixtures is raised to 150°C at a heating rate of 4°C / min, and the reaction is stirred. After 150 minutes, the temperature was cooled to 40°C and then centrifuged to obtain the intermediate; the intermediate and sodium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:1.1, and the stirring speed was 260r / min for 50 minutes. The reaction temperature is 80°C, and the pH value of the reaction is adjusted to 9. After the reaction is completed, a slurry containing nitrogen and phosphorus is obtained. The slurry is placed in a cooling crystallizer and cooled to 35°C for cyclic crystallization treatment, and the filtrate is detected and analyzed at the same time. When the nitrogen content in the filtrate was 11%, and the phosphorus content was 3.5%, stop crystallization and filte...

Embodiment 3

[0046] A preparation method of special fertilizer for cotton. Phosphoric acid and carbonamide are added to the reaction kettle at a molar ratio of 1.3:1 and mixed, and then the temperature of the two mixtures is raised to 140°C at a heating rate of 4°C / min, and the reaction is stirred. 140min, the temperature was cooled to 35°C and then centrifuged to obtain the intermediate; the intermediate and sodium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:1, and the stirring speed was 240r / min for 60min. The reaction temperature is 70°C, and the pH value of the reaction is adjusted to 8.5. After the reaction is completed, a slurry containing nitrogen and phosphorus is obtained. The slurry is placed in a cooling crystallizer and cooled to 25°C for cyclic crystallization treatment, and the filtrate is detected and analyzed at the same time. When the nitrogen content in the filtrate is 10% and the phosphorus content is 3.1%, stop crystallization and filter, and th...

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Abstract

The invention relates to the technical field of the chemical industry, and discloses a preparation method of a special fertilizer for cotton. A technical problem of soil hardening caused by the change of the structure of soil due to less autilization of fertilizers applied to cotton the residual of some element compounds in soil because the matching of the nutritional elements in present fertilizers cannot meet requirements of the nutritional elements in the growth process of cotton is solved. The method comprises the following steps: reacting phosphoric acid with carbomite to generate an intermediate, reacting the intermediate with an alkaline sodium salt, crystallizing parts of generated sodium dihydrogen phosphate to precipitate, adjusting the content of nitrogen and phosphorus in a reaction liquid to meet the growth requirements of cotton, and adding potassium and other medium trace element compounds in order to prepare the special fertilizer for cotton. The special fertilizer for cotton has the advantages of low production cost, and no discharge of waste liquids polluting the environment in the production process.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of special fertilizer for cotton. Background technique [0002] Cotton is the seed fiber of the Malvaceae cotton plant, native to the subtropical zone. The plant is shrubby and can grow up to 6 meters high in tropical areas, generally 1 to 2 meters. The flowers are milky white, turn dark red shortly after flowering and then wither, leaving small green capsules called cotton bolls. There are cottonseeds in the cotton bolls, and the fluff on the cottonseeds grows from the skin of the cottonseeds and fills the inside of the cotton bolls. When the cotton bolls mature, they crack, exposing soft fibers. The fibers are white or white with yellow, about 2 to 4 cm long, containing about 87 to 90% cellulose. Cotton is one of the most important crops in the world, with large output and low production cost, which makes the price of cotton products relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙郑培俊薛涛林玉喜赵伟毅罗春晖黄芳赵平原
Owner GUIZHOU UNIV
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