A kind of method for extracting magnesium by high-pressure carbonization

A high-pressure, magnesium oxide technology, applied in the field of high-pressure carbonization to extract magnesium, can solve the problems of high energy consumption in pyrolysis and low concentration of heavy magnesium solution, and achieve the effects of small equipment size, simple process steps, and resource saving

Inactive Publication Date: 2018-09-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] One of the objectives of the present invention is to provide a method for extracting magnesium by high-pressure carbonization in view of the problems of low concentration of heavy magnesium liquid and high energy consumption of pyrolysis in the existing magnesium extraction process, which can improve the efficiency of carbonization and extraction of magnesium. Significantly reduce energy consumption and economic costs

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  • A kind of method for extracting magnesium by high-pressure carbonization
  • A kind of method for extracting magnesium by high-pressure carbonization

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Effect test

Embodiment 1

[0045] The composition is MgO 38.13%, SiO 2 13.80%, CaO 1.30%, B 2 o 3 0.82%, TFe 6.87%, Al 2 o 3 13.5g of 1.77% soda boron mud (wherein the magnesium exists in forms such as magnesium hydroxide, serpentine) is mixed with 75g water to form a reaction slurry (magnesium that can be carbonized and extracted in the raw material (in terms of magnesium hydroxide) The mass ratio of water to water is 1:20), carbon dioxide is introduced, and the pressure is 5MPa, the stirring speed is 500rpm, and the temperature is 70°C. The reaction is 1.5h, and the heavy magnesium solution is obtained by filtering under the pressure of 5MPa. The concentration of the heavy magnesium solution (calculated as MgO) is 16.571g / L, impurity calcium ion concentration is 0.130g / L, magnesium extraction rate is 24.1%, the heavy magnesium solution is slowly reduced to normal pressure at 70°C and stirred for 1.5h, filtered and dried at 80°C After 48 hours, 2.6 g of basic magnesium carbonate with a magnesium ox...

Embodiment 2

[0047] The composition is MgO 85.85%, SiO 2 5.54%, CaO 1.76%, TFe 0.85%, Al 2 o 3 3.5g of 1.60% magnesite lightly burned powder (wherein the magnesium exists in forms such as magnesium oxide) is mixed with 75g water to form a reaction slurry (the amount of magnesium (calculated as magnesium hydroxide) that can be extracted by carbonization in the raw material and water The mass ratio is 1:17), passing carbon dioxide, reacting for 1.5h at a pressure of 5MPa, a stirring speed of 500rpm, and a temperature of 30°C, and filtering under a pressure of 5MPa to obtain a concentration of heavy magnesium solution (calculated as MgO) of 32.96g / L , the impurity calcium ion concentration is 0.18g / L, and the magnesium extraction rate is 82.3%. The heavy magnesium solution is quickly reduced to normal pressure at 30°C and left for 0.5h. After filtering, it is dried at -58°C for 8h to obtain magnesium oxide with a magnesium oxide content of 28.79%. Magnesium carbonate trihydrate 7.8g.

Embodiment 3

[0049] The composition is MgO 36.98%, SiO 2 4.77%, CaO 57.97%, TFe 1.25%, Al 2 o 3 8.1g of 1.02% dolomite lightly burned powder (magnesium therein exists in forms such as magnesium oxide) is mixed with 75g water to form a reaction slurry (the quality of magnesium (calculated as magnesium hydroxide) and water that can be extracted by carbonization in the raw material Ratio of 1:17), passing carbon dioxide, reacting at a pressure of 5MPa, a stirring speed of 500rpm, and a temperature of 50°C for 1.5h, and filtering under a pressure of 5MPa to obtain a concentration of heavy magnesium solution (calculated as MgO) of 18.04g / L, The impurity calcium ion concentration is 0.07g / L, and the magnesium extraction rate is 45.2%. The heavy magnesium solution is rapidly reduced to 1MPa at 25°C and stirred for 1h, filtered and dried at -70°C for 8h to obtain magnesium carbonate trihydrate with a magnesium oxide content of 28.67%. 3.0g.

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Abstract

The invention provides a method for extracting magnesium by means of high-pressure carbonization.The method includes steps of uniformly mixing water with raw materials with magnesium to obtain reaction slurry; carrying out carbonization reaction on the reaction slurry and carbon dioxide gas under the condition of gauge pressures of 1-5 MPa to obtain serous fluid; keeping the reaction pressures and separating solid from fluid in the serous fluid to obtain fluid with heavy magnesium; reducing the pressures and decomposing the fluid with the heavy magnesium to obtain decomposed serous slurry; separating solid from fluid in the decomposed serous fluid to obtain solid and drying the solid to obtain magnesium-rich products.The method has the advantages that the method can be applied to utilizing magnesium-rich minerals such as magnesite and magnesium-rich solid waste such as boric sludge, the carbonization magnesium extraction efficiency and the calcium and magnesium separation efficiency can be improved, and energy consumption and the economic cost can be reduced to a great extent; as compared with existing processes for extracting magnesium, the method is mild in operation temperature, little in variation, low in energy consumption and heat exchange difficulty and easy to implement, required equipment is small, and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and solid waste utilization, and relates to a method for extracting magnesium, in particular to a method for extracting magnesium by high-pressure carbonization. Background technique [0002] Magnesium and magnesium compounds are widely used in national economic and industrial fields such as metallurgy, refractory materials, rubber, adhesives and sealing materials, chemical building materials, agriculture, environmental protection, petrochemicals, aerospace and national defense, light industry, electronics, magnetic materials and feed additives . In the industry, magnesium-rich minerals such as magnesite and dolomite or magnesium-rich solid waste such as boron mud are used as raw materials, and magnesium products such as basic magnesium carbonate and magnesium oxide are produced by carbonization. In order to purify the product to achieve calcium and magnesium separation , Magnesium is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/22
Inventor 张亦飞薄婧张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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