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Production method for preparing monocalcium phosphate and by-product special fertilizer for black soybean

A technology of calcium dihydrogen phosphate and production method, which is applied in the directions of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of low purity of calcium dihydrogen phosphate and unavailability of effective components, and achieves absorption rate Good results

Inactive Publication Date: 2015-02-04
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the process of producing calcium dihydrogen phosphate from wet-process phosphoric acid, the purity of calcium dihydrogen phosphate is not high, and the filtrate also contains a large amount of unprecipitated carbonamide, NH 4 + 、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 corn special fertilizer and the absorption situation of corn from a large number of prior art documents and many years of exploration and research, and have effectively explored the production of phosphoric acid diphosphate from wet-process phosphoric acid. The special fertilizer for corn is produced from the filtrate of calcium hydrogen phosphate to solve the problem that the active ingredients in the filtrate of calcium dihydrogen phosphate produced by wet process phosphoric acid cannot be used, etc. There is no report in domestic fertilizer production

Method used

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  • Production method for preparing monocalcium phosphate and by-product special fertilizer for black soybean
  • Production method for preparing monocalcium phosphate and by-product special fertilizer for black soybean
  • Production method for preparing monocalcium phosphate and by-product special fertilizer for black soybean

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Embodiment 1

[0059] This embodiment provides a kind of production method of preparing calcium dihydrogen phosphate by-product black soybean special fertilizer, comprising the following steps:

[0060] (1) Phosphoric acid and carbonamide prepared by the wet method are mixed according to the molar ratio of 1.3:1, and the temperature is raised from 95°C to 160°C at a heating rate of 5°C / min, stirred and reacted for 4 hours, and the intermediate is separated;

[0061] (2) the intermediate, CaCO 3 The solid is put into the concentration of 20% phosphoric acid solution to stir and react at the same time. After the reaction, adjust the pH value of the solution to 3.2 with phosphoric acid solution to obtain a slurry containing nitrogen, phosphorus, and potassium, and mix the slurry containing nitrogen, phosphorus, and potassium. Place the slurry in a cooling crystallizer to cool down to 30°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer...

Embodiment 2

[0067] This embodiment provides a kind of production method of preparing calcium dihydrogen phosphate by-product black soybean special fertilizer, comprising the following steps:

[0068] (1) Phosphoric acid and carbonamide prepared by the wet method are mixed according to the molar ratio of 1.6:1, and the temperature is raised from 95°C to 160°C at a heating rate of 5°C / min, stirred and reacted for 5 hours, and the intermediate is separated;

[0069] (2) the intermediate, CaCO 3 The solid is put into the phosphoric acid solution with a concentration of 25% to stir the reaction at the same time. After the reaction, adjust the pH value of the solution to 3.2 with the phosphoric acid solution to obtain a slurry containing nitrogen, phosphorus, and potassium, and mix the slurry containing nitrogen, phosphorus, and potassium. Place the slurry in a cooling crystallizer to cool down to 30°C, carry out crystallization and filtration treatment, and circulate the filtrate in the coolin...

Embodiment 3

[0075] This embodiment provides a kind of production method of preparing calcium dihydrogen phosphate by-product black soybean special fertilizer, comprising the following steps:

[0076] (1) Phosphoric acid and carbonamide prepared by the wet method are mixed according to the molar ratio of 1.5:1, and the temperature is raised from 95°C to 160°C at a heating rate of 5°C / min, stirred and reacted for 4.5h, and the intermediate is separated;

[0077] (2) the intermediate, CaCO 3 The solid is put into the concentration of 23% phosphoric acid solution and stirred for reaction at the same time. After the reaction, adjust the pH value of the solution to 3.2 with phosphoric acid solution to obtain a slurry containing nitrogen, phosphorus and potassium, and mix the slurry containing nitrogen, phosphorus and potassium. Place the slurry in a cooling crystallizer to cool down to 30°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystalliz...

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Abstract

The invention relates to the field of chemical technique, especially to a production method for preparing monocalcium phosphate and a by-product a special fertilizer for black soybean. By changing coefficients such as temperature and the like of wet-process phosphoric acid preparation of monocalcium phosphate, purity of the product monocalcium phosphate is raised, and a compound fertilizer containing N, P and K combined forms can simultaneously be produced. By the method, purity of monocalcium phosphate can be raised, and the produced special fertilizer for black soybean has good absorptivity. Meanwhile, formaldehyde is added into a filtrate to prepare a controlled-release compound fertilizer. The produced special fertilizer for black soybean can meet nutritional requirements of each period of growth cycle. By the use of the compound fertilizer, yield of black soybean is raised greatly. The special fertilizer 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 calcium dihydrogen phosphate by-product black soybean special fertilizer. Background technique [0002] Black soybeans are a kind of soybean. Black soybeans are rich in nutrition, containing 36.1 grams of protein, 15.9 grams of fat, 10.2 grams of dietary fiber, 23.3 grams of carbohydrates, 224 mg of calcium, 243 mg of magnesium, 1377 mg of potassium, and 500 mg of phosphorus per 100 grams. Contains essential vitamins B1, B2, C, niacin and trace elements iron, manganese, zinc, copper, molybdenum, selenium, etc. "Compendium of Materia Medica" said: "The eight kidneys have many functions, so they can control water, reduce swelling, lower qi, control wind and heat, and activate blood and detoxify." Black beans can soften blood vessels, moisturize the skin, delay aging, benefit water, dispel wind, clear heat and detoxify, nourish and streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05G1/00C05B7/00C05C9/02
Inventor 廖吉星薛涛彭宝林赵伟毅朱飞武陈肖虎韩朝应
Owner GUIZHOU KAILIN GRP CO LTD
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