Method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium ammonium nitrate and magnesium ammonium sulphate

A technology of calcium ammonium nitrate and magnesium ammonium sulfate, applied in chemical instruments and methods, phosphate material processing, calcium/strontium/barium nitrate, etc., can solve problems such as threats to human and animal safety, vegetation destruction, land degradation, etc. Economic benefits, the effect of alleviating depletion and improving leaching rate

Inactive Publication Date: 2015-08-26
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a method for extracting phosphorous concentrate from phosphorous tailings and co-producing calcium ammonium nitrate and magnesium ammonium sulfate, so as to solve the problem of massive accumulation of phosphorous tailings, causing a large amount of land to be occupied and causing environmental pollution , leading to land degradation, destruction of vegetation, and threats to the safety of humans and animals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium ammonium nitrate and magnesium ammonium sulfate, comprising the following steps:

[0044] (1) Calcination: Put the phosphorus tailings into a calciner and calcinate at a temperature of 900°C for 50 minutes to obtain calcined material and carbon dioxide gas, pass the carbon dioxide gas into the absorption tower, use ammonia water to absorb, and obtain ammonium carbonate solution;

[0045] (2) Digestion: Send the calcined material and hot water at a temperature of 60°C into the digestion tank for mixing, the weight ratio of the calcined material to hot water is 5:10, and the digestion treatment time is 30 minutes to obtain a digested slurry;

[0046] (3) Calcium leaching: Put the digested slurry and ammonium nitrate solution into the leaching tank at a weight ratio of 3:2, mix them, stir at 5°C for 50 minutes, and pass the ammonia gas generated by the reaction into the absorpti...

Embodiment 2

[0051] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium ammonium nitrate and magnesium ammonium sulfate, comprising the following steps:

[0052] (1) Calcination: Put the phosphorus tailings into a calciner and calcinate at a temperature of 1000°C for 70 minutes to obtain calcined material and carbon dioxide gas, pass the carbon dioxide gas into the absorption tower, use ammonia water to absorb, and obtain ammonium carbonate solution;

[0053] (2) Digestion: Send the calcined material and hot water at a temperature of 100°C into the digestion tank for mixing, the weight ratio of the calcined material and hot water is 7:10, and the digestion treatment time is 50 minutes to obtain a digested slurry;

[0054] (3) Calcium leaching: Put the digested slurry and ammonium nitrate solution into the leaching tank at a weight ratio of 17:12, mix them, stir at 40°C for 70 minutes, and pass the ammonia gas generated by the reaction into the ab...

Embodiment 3

[0059] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium ammonium nitrate and magnesium ammonium sulfate, comprising the following steps:

[0060] (1) Calcination: Put the phosphorus tailings into a calciner and calcinate at a temperature of 950°C for 60 minutes to obtain the calcined material and carbon dioxide gas, pass the carbon dioxide gas into the absorption tower, use ammonia water to absorb, and obtain an ammonium carbonate solution;

[0061] (2) Digestion: Send the calcined material and hot water at a temperature of 80°C into the digestion tank for mixing, the weight ratio of the calcined material and hot water is 3:5, and the digestion treatment time is 40 minutes to obtain a digested slurry;

[0062] (3) Calcium leaching: Put the digested slurry and ammonium nitrate solution into the leaching tank at a weight ratio of 16:11 and mix them, then stir at 25°C for 60 minutes, and pass the ammonia gas generated by the reaction...

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PUM

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Abstract

The invention discloses a method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium ammonium nitrate and magnesium ammonium sulphate. Phosphate tailings are calcined under high temperature, hot water is added into the calcined material for digestion treatment, an ammonium nitrate solution is added to the calcined material, the mixture is stirred, calcium is extracted under a certain temperature, calcium-containing leaching liquid and leaching residues are obtained, phosphate concentrate and magnesium-containing leaching liquid are obtained after magnesium is extracted from the leaching residues with an ammonium sulfate solution, and calcium ammonium nitrate and magnesium ammonium sulphate are obtained after the calcium-containing leaching liquid and the magnesium-containing leaching liquid are concentrated and dried. According to the method, phosphate concentrate, calcium ammonium nitrate and magnesium ammonium sulphate are prepared with phosphate tailings as the main raw materials, large-scale treatment can be carried out on the phosphate tailings, the problem that because phosphate tailings pile up in quantity, the phosphate tailings occupy a lot of land and pollute the environment is solved, and the obtained phosphate concentrate, calcium ammonium nitrate and magnesium ammonium sulphate can bring certain economic interests.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of phosphorus tailings, in particular to a method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium ammonium nitrate and magnesium ammonium sulfate. Background technique [0002] Phosphate rock is a non-renewable resource. Although my country's phosphate rock resources are relatively rich, the grade of phosphate rock is low. Most of the phosphate rock must be enriched by ore dressing before it can be used to produce phosphoric acid and high-concentration phosphate fertilizers. Due to the There are many impurities in the phosphate rock, which leads to the low actual utilization rate of phosphate rock in our country, and the demand for phosphorus in our country is particularly large. After years of mining and utilization, the phosphate rock resources in our country have been exhausted day by day. [0003] Phosphorus tailings are unutilized solid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/42C01F5/00
Inventor 顾春光张钦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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