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

A technology of potassium dihydrogen phosphate and production method, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of unavailability of active ingredients, low purity of potassium dihydrogen phosphate, etc.

Inactive Publication Date: 2015-01-28
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 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 plum special fertilizer and the absorption situation of plums 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 plums is prepared from the filtrate of potassium hydrogen phosphate to solve the problem that the active ingredients in the filtrate of potassium dihydrogen phosphate produced by wet process phosphoric acid cannot be used. There is no report in domestic fertilizer production

Method used

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  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for plums as byproduct
  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for plums as byproduct
  • Method for preparing potassium dihydrogen phosphate and preparing special fertilizer for plums as byproduct

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A production method for preparing potassium dihydrogen phosphate by-product plum special fertilizer. Phosphoric acid and carbonamide are mixed according to the molar ratio of 1.3:1, and the temperature is raised from 80°C to 160°C at a heating rate of 5°C / min, and the reaction is stirred for 4 ~5h, the intermediate was separated; then the intermediate was mixed with the basic potassium salt at a molar ratio of 1:1.5, and after the reaction was completed, a slurry containing nitrogen, phosphorus, and potassium was obtained, and the nitrogen, phosphorus, and potassium Place the slurry in a cooling crystallizer to cool down to 30-35°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 the component content in the filtrate is detected; Add alkaline calcium and phosphoric acid to the filtrate, when the pH of the soluti...

Embodiment 2

[0071] A production method for preparing potassium dihydrogen phosphate by-product plum special fertilizer, which uses phosphoric acid and carbonamide to be mixed at a molar ratio of 1.6:1, and the temperature is raised from 80°C to 160°C at a heating rate of 5°C / min, and the reaction is stirred for 4 ~5h, the intermediate was separated; then the intermediate was mixed with the basic potassium salt at a molar ratio of 1:1.5, and after the reaction was completed, a slurry containing nitrogen, phosphorus, and potassium was obtained, and the nitrogen, phosphorus, and potassium Place the slurry in a cooling crystallizer to cool down to 30-35°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 the component content in the filtrate is detected; Add alkaline calcium and phosphoric acid to the filtrate, when the pH of the solut...

Embodiment 3

[0079] A production method for preparing potassium dihydrogen phosphate by-product plum special fertilizer, mixing phosphoric acid and carbonamide at a molar ratio of 1.4:1, raising the temperature from 80°C to 160°C at a heating rate of 5°C / min, and stirring for 4 ~5h, the intermediate was separated; then the intermediate was mixed with the basic potassium salt at a molar ratio of 1:1.3, and after the reaction was completed, a slurry containing nitrogen, phosphorus, and potassium was obtained, and the nitrogen, phosphorus, and potassium Place the slurry in a cooling crystallizer to cool down to 30-35°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 the component content in the filtrate is detected; Add alkaline calcium and phosphoric acid to the filtrate, when the pH of the solution is 8.5-9.0, the content of nitrog...

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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 plums 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. The method improves the purity of potassium dihydrogen phosphate, and the produced special fertilizer for plums has high absorptivity; and formaldehyde is added to a filtrate to prepare the controlled release compound fertilizer. The produced special fertilizer for plums can meet the nutrition needs of plums in all stages of the growth period of plums, greatly increases the output of plums, 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 a special fertilizer for by-product plums produced by potassium dihydrogen phosphate. 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, d...

Claims

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Application Information

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IPC IPC(8): C01B25/30C05G1/00
Inventor 杜绍伦高贵龙廖吉星薛涛张志梅陈肖虎魏发展赵伟毅曾舒王丽远
Owner GUIZHOU KAILIN GRP CO LTD
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