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Method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide

A technology for phosphate tailings and phosphate concentrates, which can be used in the treatment of magnesium oxide, calcium carbonate/strontium/barium, and phosphate materials, and can solve problems such as vegetation destruction, environmental pollution, and land degradation.

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

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to provide a method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium carbonate and magnesium oxide, 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, resulting in Land degradation, destruction of vegetation, threats to the safety of humans and animals

Method used

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  • Method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide
  • Method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide
  • Method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide

Examples

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Embodiment 1

[0074] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium carbonate and magnesium oxide, comprising the following steps:

[0075] (1) calcining: the phosphorus tailings are sent to a calciner and calcined at a temperature of 900 ° C for 50min to obtain a calcined material and carbon dioxide gas, the carbon dioxide gas is passed into the absorption tower, and ammonia water is used to absorb it to obtain an ammonium carbonate solution;

[0076] (2) Digestion: the calcined material and the hot water with a temperature of 60°C are sent into the digestion tank to be mixed, the weight ratio of the calcined material to the hot water is 5:10, and the digestion treatment time is 30 min to obtain a digestion slurry;

[0077] (3) leaching calcium: after the digestion slurry and ammonium nitrate solution are sent into the leaching tank at a weight ratio of 15:10 and mixed, they are stirred at 5°C for 50 minutes, and the ammonia gas generated by...

Embodiment 2

[0084] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium carbonate and magnesium oxide, comprising the following steps:

[0085] (1) calcination: send the phosphorus tailings into a calciner and calcinate at a temperature of 1000 ° C for 70min to obtain calcined material and carbon dioxide gas, pass the carbon dioxide gas into the absorption tower, and use ammonia water to absorb to obtain an ammonium carbonate solution;

[0086] (2) Digestion: the calcined material and the hot water with a temperature of 100°C are sent into the digestion tank to be mixed, the weight ratio of the calcined material to the hot water is 7:10, and the digestion treatment time is 50 min to obtain a digestion slurry;

[0087] (3) leaching calcium: after the digestion slurry and ammonium nitrate solution are sent into the leaching tank at a weight ratio of 17:12 and mixed, they are stirred at 40° C. for 70 minutes, and the ammonia gas generated by the rea...

Embodiment 3

[0094] A method for extracting phosphorus concentrate from phosphorus tailings and co-producing calcium carbonate and magnesium oxide, comprising the following steps:

[0095] (1) calcination: send the phosphorus tailings into a calciner and calcinate at a temperature of 930 ° C for 55min to obtain calcined material and carbon dioxide gas, pass the carbon dioxide gas into the absorption tower, and use ammonia water to absorb to obtain an ammonium carbonate solution;

[0096] (2) Digestion: the calcined material and the hot water with a temperature of 70°C are sent into the digestion tank to be mixed, the weight ratio of the calcined material to the hot water is 6:10, and the digestion treatment time is 45min to obtain a digestion slurry;

[0097] (3) leaching calcium: after the digestion slurry and ammonium nitrate solution are sent into the leaching tank at a weight ratio of 16:10 and mixed, they are stirred at 20 ° C for 55 min, and the ammonia gas generated by the reaction i...

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Abstract

The invention discloses a method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide. First, 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, calcium carbonate is obtained after the calcium-containing leaching liquid is precipitated by an ammonium carbonate solution, magnesium carbonate is obtained after the magnesium-containing leaching liquid is precipitated by an ammonium carbonate solution, and magnesium oxide is obtained after the magnesium carbonate is calcined. According to the method, phosphate concentrate, calcium carbonate and magnesium oxide 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 products of phosphate concentrate, calcium carbonate and magnesium oxide are obtained.

Description

technical field [0001] The invention relates to the technical field of recycling and utilization of phosphorus tailings, in particular to a method for extracting phosphorus concentrates from phosphorus tailings and producing calcium carbonate and magnesium oxide. Background technique [0002] Phosphate rock is a non-renewable resource. Although my country's phosphate rock resources are relatively abundant, the grade of phosphate rock is relatively low. There are many impurities in the phosphate rock, which leads to the low actual utilization rate of phosphate rock in my country, and the demand for phosphorus in my country is particularly large. After years of mining and utilization, my country's phosphate rock resources have been gradually exhausted. [0003] Phosphate tailings are unutilized solid waste discharged from phosphate rock flotation concentrate. The grade of phosphate ore raw ore in my country is not high, which causes the phosphorus chemical industry to discharg...

Claims

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Application Information

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IPC IPC(8): C01B25/01C01F11/18C01F5/06
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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