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Method for separating and extracting magnesium and calcium from secondary ammonium salt treating phosphate tailings

A technology of phosphorus tailings and ammonium salts, applied in chemical instruments and methods, magnesium hydroxide, calcium carbonate/strontium/barium, etc., can solve the problem of reducing the recovery rate of calcium and magnesium, as well as high purity, whiteness, and carbonization process requirements. To deal with the problem of high cost, to achieve the effect of improving purity and whiteness, low processing cost and simple process

Inactive Publication Date: 2020-06-19
QIANNAN NORMAL UNIV FOR NATTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although there are many reports about the extraction of magnesium and calcium from phosphorus tailings, the biggest problem in the existing process is that the carbonization process is required when changing the separation process, the process is complicated, the treatment cost is high, and the carbonization process requires high requirements. It is easy to generate magnesium carbonate and calcium carbonate at the same time, which greatly reduces the recovery rate, purity and whiteness of calcium and magnesium

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  • Method for separating and extracting magnesium and calcium from secondary ammonium salt treating phosphate tailings
  • Method for separating and extracting magnesium and calcium from secondary ammonium salt treating phosphate tailings
  • Method for separating and extracting magnesium and calcium from secondary ammonium salt treating phosphate tailings

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Embodiment 1

[0050] Embodiment 1: A method for separating and extracting magnesium and calcium from phosphorous tailings treated with secondary ammonium salts, the steps are as follows:

[0051] Calcination: Phosphorus tailings are calcined at 950°C;

[0052] Digestion: the calcined phosphorus tailings are digested with ammonium chloride solution to obtain digestive juice;

[0053] The first step of ammonium solution: according to the content of calcium and magnesium in the digestive juice, add excess ammonium chloride, heat to boiling, and steam out ammonia gas;

[0054] Filtration: After the first step of ammonium solution, filter and separate, the filter residue is phosphorus concentrate and magnesium hydroxide, and the filtrate is calcium chloride solution;

[0055] Calcium carbonate production: carbon dioxide and ammonia are introduced into the calcium chloride solution to adjust the pH to precipitate calcium carbonate;

[0056] Filtration: Filtration and separation to obtain calciu...

Embodiment 2

[0062] Embodiment 2: A method for separating and extracting magnesium and calcium from phosphorous tailings treated with secondary ammonium salts, the steps are as follows:

[0063] Calcination: Phosphorus tailings are calcined at 850°C;

[0064] Digestion: the calcined phosphorus tailings are digested with ammonium chloride solution to obtain digestive juice;

[0065] The first step of ammonium solution: according to the content of calcium and magnesium in the digestive juice, add excess ammonium chloride, heat to boiling, and steam out ammonia gas;

[0066] Filtration: After the first step of ammonium solution, filter and separate, the filter residue is phosphorus concentrate and magnesium hydroxide, and the filtrate is calcium chloride solution;

[0067] Calcium carbonate production: carbon dioxide and ammonia are introduced into the calcium chloride solution to adjust the pH to precipitate calcium carbonate;

[0068] Filtration: Filtration and separation to obtain calciu...

Embodiment 3

[0074] Embodiment 3: A method for separating and extracting magnesium and calcium from phosphorous tailings treated with secondary ammonium salts, the steps are as follows:

[0075] Calcination: Phosphorus tailings are calcined at 1050°C;

[0076] Digestion: the calcined phosphorus tailings are digested with ammonium nitrate solution to obtain digestive juice;

[0077] The first step of ammonium solution: according to the content of calcium and magnesium in the digestive juice, add excess ammonium nitrate, heat to boiling, and steam out ammonia gas;

[0078] Filtration: After the first step of ammonium solution, filter and separate, the filter residue is phosphorus concentrate and magnesium hydroxide, and the filtrate is calcium nitrate solution;

[0079] Preparation of calcium carbonate: carbon dioxide and ammonia water are introduced into the calcium nitrate solution to adjust the pH to precipitate calcium carbonate;

[0080] Filtration: Filtration and separation to obtain...

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Abstract

The invention discloses a method for separating and extracting magnesium and calcium from secondary ammonium salt treating phosphate tailings. The method comprises the following steps: calcining phosphate tailings, digesting the phosphate tailings with an ammonium salt solution, adding the ammonium salt into a digestive juice, heating to evaporate ammonia gas, filtering and separating, introducingcarbon dioxide and ammonia gas or carbon dioxide and ammonia water into the calcium salt solution to separate out calcium carbonate precipitates, filtering and separating to obtain calcium carbonatesolid, taking filter residues obtained by filtering after ammonolysis in the first step, adding the ammonium salt, heating to evaporate ammonia gas, after the second step of ammonolysis is finished, filtering and separating, adding ammonia water or ammonia gas into the filtrate after the phosphate concentrate is separated, separating out magnesium hydroxide precipitates, filtering and separating to obtain magnesium hydroxide solids, continuously recycling filtrate which is a solution containing ammonium salt, and drying the prepared calcium carbonate and magnesium hydroxide to obtain a finished product. The method has the characteristics of simple process, low treatment cost, high calcium and magnesium recovery rate and high purity and whiteness.

Description

technical field [0001] The invention relates to a method for separating and extracting magnesium and calcium from phosphorus tailings, in particular to a method for separating and extracting magnesium and calcium from phosphorus tailings treated with secondary ammonium salts. Background technique [0002] Phosphorus tailings is a kind of industrial waste discharged after flotation of raw phosphate ore, that is, waste residue. With the increase in the mining of phosphate rock, the quantity of tailings also increases surprisingly (for example, 200,000 to 300,000 tons of phosphate tailings are produced for every 700,000 tons of raw ore after selection). [0003] Because P in phosphorous tailings 2 o 5 The content of phosphorous tailings is low, the content of harmful impurities such as magnesium and calcium is high, and the utilization value is very low. Phosphorus tailings that have not been effectively treated for a long time have piled up like mountains, causing serious po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01F5/20
CPCC01F11/182C01F5/20C01P2006/80C01P2002/72C01P2006/65
Inventor 周骏宏宿留华王富龙郭泽华赵增懿石启福高正艳彭忠婷吴寿英林玲
Owner QIANNAN NORMAL UNIV FOR NATTIES