Method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate with phosphate tailings

A technology of magnesium ammonium phosphate and magnesium ammonium nitrate, applied in chemical instruments and methods, phosphorus compounds, magnesium compounds, etc., can solve problems that threaten human and animal safety, land degradation, and vegetation destruction, and achieve good fertilizer efficiency, rich nutrient element content, The effect of increasing phosphorus content

Inactive Publication Date: 2015-08-26
GUIZHOU RES INST OF CHEM IND +1
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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 method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate by utilizing phosphorus tailings, so as to solve a large amount of accumulat

Method used

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  • Method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate with phosphate tailings
  • Method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate with phosphate tailings

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Embodiment 1

[0059] A method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate from phosphorus tailings, comprising the following steps:

[0060] (1) Acid hydrolysis: first add nitric acid into the reaction tank, adjust the temperature to 50°C, keep the constant temperature, and adjust the speed to 200r / min, then add phosphorus tailings, and then increase the speed to 10r / min. 450r / min, ammonia water is used to absorb the carbon dioxide gas generated by the reaction to obtain ammonium carbonate solution, the mass ratio of nitric acid and phosphorus tailings is 2:1, and after 1 hour of reaction, the reaction material liquid is obtained;

[0061] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis residue to obtain residue and lotion, and return the lotion to the acidolysis process;

[0062] (3) Decalcification: first preheat the acidolysis solution to a temperature of 50°C, adjust the r...

Embodiment 2

[0070] A method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate from phosphorus tailings, comprising the following steps:

[0071] (1) Acid hydrolysis: first add nitric acid into the reaction tank, adjust the temperature to 60°C, keep the constant temperature, and adjust the speed to 300r / min, add phosphorus tailings, and then increase the speed to 20r / min. 550r / min, ammonia water is used to absorb the carbon dioxide gas generated by the reaction to obtain ammonium carbonate solution, the mass ratio of nitric acid and phosphorus tailings is 3:1, and after 3 hours of reaction, the reaction feed liquid is obtained;

[0072] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis residue to obtain residue and lotion, and return the lotion to the acidolysis process;

[0073] (3) Decalcification: first preheat the acidolysis solution to a temperature of 60°C, adjust the rotating ...

Embodiment 3

[0081] A method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate from phosphorus tailings, comprising the following steps:

[0082] (1) Acid hydrolysis: first add nitric acid into the reaction tank, adjust the temperature to 55°C, keep the constant temperature, and adjust the speed to 250r / min, then add phosphorus tailings, and then increase the speed to 15r / min. 500r / min, using ammonia water to absorb the carbon dioxide gas generated by the reaction, to obtain ammonium carbonate solution, the mass ratio of nitric acid and phosphorus tailings is 2.5:1, after 2 hours of reaction, the reaction material liquid is obtained;

[0083] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis residue to obtain residue and lotion, and return the lotion to the acidolysis process;

[0084](3) Decalcification: first preheat the acid solution to a temperature of 55°C, adjust the speed of t...

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Abstract

The invention discloses a method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate with phosphate tailings. The method comprises the steps of using nitric acid for carrying out acidolysis on phosphate tailings, filtering and washing reaction feed liquid to obtain acidolysis liquid and acidolysis residues, preheating the acidolysis liquid, adding an ammonium sulfate solution into the acidolysis liquid, stirring the mixture for some time for reaction under a certain temperature and then filtering the mixture to obtain gypsum and a decalcifying solution, adding ammonia water into the decalcifying solution for neutralization and filtering the mixture to obtain a neutralization solution and residues, pelletizing the residues to obtain magnesium ammonium phosphate, and pelletizing the neutralization solution after concentrating the neutralization solution to obtain magnesium ammonium nitrate. With the method, phosphate tailings can be treated in a large-scale mode, the problem that phosphate tailings piles up in bulk is effectively solved, and the obtained products, namely magnesium ammonium phosphate and magnesium ammonium nitrate, contain active magnesium, and have good fertilizer efficiency.

Description

technical field [0001] The invention relates to the technical field of recycling phosphorus tailings, in particular to a method for preparing magnesium ammonium phosphate and magnesium ammonium nitrate from phosphorus tailings. Background technique [0002] Phosphorus tailings are unutilized solid waste discharged from phosphate ore flotation concentrate. The grade of raw phosphate rock in my country is not high, which has caused the phosphorus chemical industry to discharge a large amount of phosphorus tailings when phosphate rock flotation concentrates are produced. For every 3 tons of phosphate rock produced, 1 ton of phosphorus tailings is discharged. The massive accumulation of phosphorus tailings not only takes up a lot of land, but also causes environmental pollution. With the continuous development of my country's phosphorus chemical industry and the continuous increase of social demand, the demand for phosphorus products has also increased, and the accumulation of p...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01F5/00B09B3/00
Inventor 顾春光张钦詹光健张富强卢玉莲张澜曦韩瑜张仁秀
Owner GUIZHOU RES INST OF CHEM IND
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