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Method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate from phosphor tailings

A technology of calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate, which is applied in the field of recycling of phosphorus tailings, and can solve problems such as threats to human and animal safety, environmental pollution, and land degradation

Active Publication Date: 2015-08-12
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a method for preparing calcium magnesium phosphate and calcium magnesium ammonium nitrate by using phosphorus tailings, so as to solve the problem of a large amount of accumulation of phosphorus tailings, causing a large amount of land to be occupied, causing environmental pollution, and causing land pollution. Degradation, destruction of vegetation, threats to the safety of humans and animals

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  • Method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate from phosphor tailings

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Effect test

Embodiment 1

[0052] A method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate by utilizing phosphorus tailings, comprising the following steps:

[0053] (1) Acid hydrolysis: first add the nitric acid solution into the reaction tank, adjust the temperature to 50°C, keep the constant temperature, and adjust the rotation speed to 250r / min, then slowly add the phosphorus tailings to ensure that the foam does not overflow the reaction tank, and then Increase the rotation speed to 450r / min at a speed of 10r / min. The mass ratio of nitric acid solution and phosphorus tailings is 2:1. The carbon dioxide gas generated during the reaction is passed into the absorption tower, and ammonia water is used for absorption to obtain ammonium carbonate solution, after reacting for 1h, the reaction feed liquid was obtained;

[0054] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis resid...

Embodiment 2

[0064] A method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate by utilizing phosphorus tailings, comprising the following steps:

[0065] (1) Acid hydrolysis: first add the nitric acid solution into the reaction tank, adjust the temperature to 60°C, keep the constant temperature, and adjust the rotation speed to 350r / min, then slowly add the phosphorus tailings to ensure that the foam does not overflow the reaction tank, and then Increase the rotation speed to 600r / min at a speed of 20r / min. The mass ratio of nitric acid solution and phosphorus tailings is 3:1. The carbon dioxide gas generated during the reaction is passed into the absorption tower, and ammonia water is used for absorption to obtain ammonium carbonate. solution, after reacting for 3 hours, the reaction feed liquid was obtained;

[0066] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis...

Embodiment 3

[0076] A method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate by utilizing phosphorus tailings, comprising the following steps:

[0077] (1) Acid hydrolysis: first add the nitric acid solution into the reaction tank, adjust the temperature to 55°C, keep the constant temperature, and adjust the rotation speed to 300r / min, then slowly add the phosphorus tailings to ensure that the foam does not overflow the reaction tank, and then Increase the rotation speed to 500r / min at a speed of 15r / min. The mass ratio of nitric acid solution and phosphorus tailings is 2.5:1. The carbon dioxide gas generated during the reaction is passed into the absorption tower, and ammonia water is used for absorption to obtain ammonium carbonate. solution, after reacting for 2h, the reaction feed liquid was obtained;

[0078] (2) Filtration and washing: filter the reaction feed liquid to obtain acidolysis solution and acidolysis residue, wash the acidolysis re...

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Abstract

The invention discloses a method for preparing calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate from phosphor tailings. The method comprises the following steps: adding a nitric acid solution into a reaction tank, then adding phosphor tailings, carrying out reactions at a certain rotation speed and temperature, filtering and washing the reaction products to obtain residues and acid-leach liquor; adding ammonia water into the acid-leach liquor to adjust the pH value, carrying out reactions at a certain stirring speed and temperature, filtering the reaction products to obtain a neutralized solution and filter residues, drying the filter residues to obtain calcium magnesium ammonium phosphate, condensing the neutralized solution, and granulating to obtain calcium magnesium ammonium nitrate. The provided method can process phosphor tailings in a large amount, and the obtained calcium magnesium ammonium phosphate and calcium magnesium ammonium nitrate can be used to produce compound fertilizer.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of phosphorus tailings, in particular to a method for preparing calcium magnesium ammonium phosphate and calcium 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 phosphorus concentrate produced, 1 ton of phosphorus tailings is discharged. , The massive accumulation of phosphorus tailings not only takes up a lot of land, but also brings 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 h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B11/06C05C13/00
Inventor 顾春光张钦张富强文焱炳卢玉莲张澜曦韩瑜张仁秀
Owner GUIZHOU RES INST OF CHEM IND
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