Unlock instant, AI-driven research and patent intelligence for your innovation.

A production method for preparing calcium dihydrogen phosphate by-product corn special fertilizer

A technology of calcium dihydrogen phosphate and its production method, which is applied in the direction of chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of waste of resources, low purity of calcium dihydrogen phosphate, and low purity of dipotassium hydrogen phosphate products, and achieve The effect of increasing the content of elements

Inactive Publication Date: 2017-02-08
GUIZHOU KAILIN GRP CO LTD +2
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] After the whole reaction is over, the carboxamide does not undergo any changes, and because of the high solubility of carboxamide, at 20°C, its solubility is 85g / 100ml (see "Phosphate Fertilizers and Compound Fertilizers" Volume 20 Issue 6 - Chemistry Fertilizer solubility and compound fertilizer production process), and the solubility of carbonamide increases with the increase of temperature, so after the carbonamide contained in the filtrate is precipitated by cooling crystals, the filtrate also contains a large amount of unprecipitated carbonamide, NH 4 + 、H 2 PO 4 ～ 、HPO 4 2～ 、PO 4 3～ , if the waste water is discharged directly, it will not only waste resources, but also cause waste of resources, and the purity of dipotassium hydrogen phosphate produced is not high
[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 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A production method for preparing calcium dihydrogen phosphate by-product corn special fertilizer
  • A production method for preparing calcium dihydrogen phosphate by-product corn special fertilizer
  • A production method for preparing calcium dihydrogen phosphate by-product corn special fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of production method of preparing calcium dihydrogen phosphate by-product corn special fertilizer provided by the invention comprises the following steps

[0057] (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 5 hours, and the intermediate is separated;

[0058] (2) separate and obtain intermediate; Intermediate, CaCO 3 The solid is put into the phosphoric acid solution to stir and react at the same time. The reaction time is 2 hours. 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 calcium, and mix the nitrogen, phosphorus and calcium. The slurry is placed in a cooling crystallizer to cool down to 30°C, and crystallization and filtration are carried out, and the filtrate is circulated and crystal...

Embodiment 2

[0064] A kind of production method of preparing calcium dihydrogen phosphate by-product corn special fertilizer provided by the invention comprises the following steps

[0065] (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 4 hours, and the intermediate is separated;

[0066] (2) separate and obtain intermediate; Intermediate, CaCO 3The solid is put into the phosphoric acid solution to stir and react at the same time. The reaction time is 2h. 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 calcium. The slurry is placed in a cooling crystallizer to cool down to 35°C, and crystallization and filtration are carried out, and the filtrate is circulated and crystallized in the cooling crystallizer. The obtained filt...

Embodiment 3

[0072] A kind of production method of preparing calcium dihydrogen phosphate by-product corn special fertilizer provided by the invention comprises the following steps

[0073] (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 for 4 hours, and the intermediate is separated;

[0074] (2) separate and obtain intermediate; Intermediate, CaCO 3 The solid is put into the phosphoric acid solution at the same time to stir and react. The reaction time is 2 hours. , to obtain a slurry containing nitrogen, phosphorus, and calcium, and place the slurry containing nitrogen, phosphorus, and calcium in a cooling crystallizer to cool down to 33°C, perform crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment, The obtained filter cake is a calcium dihydrogen phosphate produ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing calcium dihydrogen phosphate and preparing a special fertilizer for maize as a byproduct. The temperature and other coefficients of the preparation technology of calcium dihydrogen phosphate from phosphoric acid through a wet process are changed, so the purity of the calcium dihydrogen phosphate product is improved, and the N, P and K compounded fertilizer is produced. The method improves the purity of calcium dihydrogen phosphate, and the produced special fertilizer for maize has high absorptivity; and formaldehyde is added to a filtrate to prepare the controlled release compound fertilizer. The produced special fertilizer for maize can meet the nutrition needs of maize in all stages of the growth period of maize, greatly increases the output of maize, 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 calcium dihydrogen phosphate by-product special corn fertilizer. Background technique [0002] Corn is the seed of the herbaceous plant millet, and the shell is millet. Also known as white millet, indica millet, hard millet. Widely cultivated in northern my country. Harvest the ripe fruit in autumn, dry and peel the shell for use. Sweet, salty, cool in nature. It can benefit the spleen and stomach, nourish the kidney qi, relieve restlessness and heat, and facilitate urination. For deficiency-heat in the spleen and stomach, nausea and vomiting or diarrhea due to spleen deficiency; dysphoria and thirst, dry mouth; hot knot in the bladder, dysuria, etc. [0003] According to relevant data, the vitamin E content in corn fat is high, which is beneficial to promote endocrine activities in the human body; the glutamic acid contained in co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C05G1/00
Inventor 廖吉星薛涛朱飞武高贵龙刘琼陈肖虎徐园
Owner GUIZHOU KAILIN GRP CO LTD