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Method for production of high-purity concentrated magnesium chloride solution

A solution and slurry technology, applied in the field of preparing magnesium chloride solution, can solve the problems of expensive installation and maintenance of ion exchange columns, obstacles to magnesium production, etc.

Inactive Publication Date: 2001-10-24
NORANDA MINES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ion exchange columns are extremely expensive to install and maintain due to the need to periodically regenerate the resin or programmatically replace the resin
Further, due to its limited production capacity, such columns are likely to become an obstacle restricting magnesium production

Method used

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  • Method for production of high-purity concentrated magnesium chloride solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This example shows that when all the conditions of the process of the present invention are met, a substantially pure magnesium chloride solution having less than 1 ppm of any contaminant in the solution can be prepared.

[0059] Serpentine tailings (composition: 23% Mg; 5% Fe; 0.0593% Mn and 0.21% Ni) were continuously fed into the first leaching reactor at a rate of 140kg / h. Concentrated hydrochloric acid (33%), circulating hydrochloric acid (4-7%) and circulating washing water (30-60g / l Mg) are also continuously fed into the first reactor at flow rates of 218l / h, 56l / h and 100l / h, respectively. About 68% of the magnesium was extracted in the first leach reactor and 72% in the second leach reactor. The total residence time in both reactors was 120 minutes. The unheated temperature of the leaching reactor was 80-85°C. Magnesium oxide slurry (30wt%) was fed into the first neutralization reactor together with chlorine gas, the pH value was maintained at 1.8, and the po...

Embodiment 2

[0061] This example shows that when the potential value in the third neutralization reactor is unsuitable, the concentration of manganese is significantly higher than 1 ppm.

[0062] Serpentine tailings (composition: 23% Mg; 5% Fe; 0.0593% Mn and 0.21% Ni) were continuously fed into the first leaching reactor at a rate of 165 kg / h. Under these conditions, the circuit will operate at 120% of nominal flow. Concentrated hydrochloric acid (33%), circulating hydrochloric acid (4-7%) and circulating washing water (30-60g / l Mg) were also continuously fed into the first reactor at flow rates of 263l / h, 56l / h and 133l / h, respectively. The total residence time in both reactors was 100 minutes. About 68% of the magnesium was extracted in the first leach reactor and 74% in the second leach reactor. Magnesium oxide slurry (30wt%) was fed into the first neutralization reactor together with chlorine gas, the pH value was maintained at 1.7, and the potential was about +246mV (Ag-AgCl). Add...

Embodiment 3

[0064] The results in this example are obtained because some parameters in the method of the present invention are not within the specified range. As shown, when unfavorable pH and potential values ​​are used, the nickel and iron concentrations are above 1 ppm.

[0065] Other conditions are the same as in Examples 1 and 2, only the acid / ore ratio used in the leaching process is 0.73. Serpentine tailings (composition: 22.8% Mg; 8.1% Fe; 0.0516% Mn and 0.21% Ni) are continuously fed into the first leaching reactor at a flow rate of 146kg / h, while 33% hydrochloric acid is added at 240l / h, 75l / h Add circulating hydrochloric acid (4-7%) and 82 l / h add circulating washing water (30-60 g / lMg). About 71% of the magnesium was extracted in the first leach reactor and 81% of the magnesium was extracted in the second leach reactor. The final solution from the last neutralization reactor contained an average concentration of 91.5 g / l Mg (28.7% MgCl 2 ). The average concentration is 1.5...

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Abstract

The present invention is concerned with a method for the extraction of magnesium from magnesium-containing materials such as magnesite, dolomite and silicates materials like serpentine residues, products from the amphibole or pyroxene group. The magnesium-containing material is first leached in at least one leaching reactor, and subsequently submitted to a series of neutralizing steps in separate reactors under controlled pH and oxydo-reduction potentials. The slurry produced is filtered to produce a substantially pure magnesium chloride solution containing less than 1 ppm of each contaminant present therein.

Description

field of invention [0001] The present invention relates to an improved process for the extraction of magnesium from a magnesium-containing feedstock to produce a concentrated magnesium chloride solution, such as a brine, suitable for the production of pure magnesium metal by electrolysis of molten magnesium chloride in an electrolytic cell. The method can produce high purity solutions from various magnesium-containing raw materials, such as silicon-containing, carbon-containing or metal oxide materials. Background of the invention [0002] Although magnesium is not found in elemental form, it is the eighth most abundant element in the Earth's crust. It was chosen as the lightweight material because it is 1 / 3 lighter than aluminum and has the highest strength-to-weight ratio compared to conventional metals. Magnesium is about 1 / 4 the density of steel and zinc, and it has several excellent processing properties compared with other materials, including impact resistance and vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C22B3/20C22B26/22
CPCC22B26/22C01F5/30Y02P10/20
Inventor 卡尔·怀特米歇尔·贝鲁比
Owner NORANDA MINES
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