Method for producing metal by molten salt electrolysis and apparatus used for the production method
a technology of molten salt and electrolysis method, which is applied in the direction of metal-working apparatus, manufacturing tools, cells, etc., can solve the problems of large amount of wastewater generated, large amount of ion exchange, and limited metal elements that can be separated and deposited by purification using aqueous solution electrolysis, etc., and achieves low cost and high purity.
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first embodiment-1
[0146]An example of this embodiment will be described that is a method for obtaining neodymium (Nd), dysprosium (Dy), and praseodymium (Pr) by molten salt electrolysis from an ore containing Nd, Dy, and Pr. Examples of the ore include monazite, apatite, xenotime, fergusonite, and eudialyte.
[0147]As illustrated in FIG. 1, a preparation step (S10) is first performed.
[0148]In this step, for example, an ore that is a treatment object, a molten salt to be used, and an apparatus including, for example, electrodes and a container for containing the molten salt are prepared. Optionally, in order to promote dissolution of the treatment object in the molten salt, the treatment object may be finely ground for the purpose of increasing the contact area between the treatment object and the molten salt.
[0149]The ore containing Nd, Dy, and Pr may be, for example, xenotime ore. For example, a xenotime ore has a composition of 3.0% Nd, 7.9% Dy, and 0.5% Pr.
[0150]Subsequently, a dissolution step in t...
first embodiment-2
[0179]An example of this embodiment will be described that is a method for obtaining neodymium (Nd), dysprosium (Dy), and praseodymium (Pr) by molten salt electrolysis from a crude metal ingot obtained by smelting an ore containing Nd, Dy, and Pr.
[0180]The crude metal ingot containing Nd, Dy, and Pr may be, for example, mixed rare earth metal (didymium). A smelting method for obtaining the mixed rare earth metal is not particularly limited and may be selected from publicly known methods.
[0181]As illustrated in FIG. 6, a step (S11) of preparing a crude metal ingot serving as a treatment object is first performed. Specifically, as illustrated in FIG. 7, a crude metal ingot serving as a treatment object 3 is immersed in a molten salt 2 contained within a container 1; and a conductive wire 5 is connected to the treatment object 3, the conductive wire 5 being used for connection to a power supply in a control unit 9. The salt used was LiCl—KCl.
[0182]In the molten salt 2, an electrode mat...
fourth embodiment
[0295]This embodiment is a method for producing a metal by molten salt electrolysis, the method including a step of dissolving, in a molten salt, a metal element contained in a treatment object containing two or more metal elements; and a step of depositing or alloying a particular metal present in the molten salt, on one of a pair of electrode members disposed in the molten salt containing the dissolved metal element, by controlling a potential of the electrode members to a predetermined value.
[0296]Roughly speaking, this embodiment includes a process of dissolving, in a molten salt, a particular metal contained in the treatment object, and a process of depositing the particular metal on one of electrodes (cathode) from the molten salt containing the dissolved particular metal by molten salt electrolysis. A feature of this embodiment is that, by controlling the potential of the electrodes to a predetermined value, the particular metal is selectively deposited from the treatment obj...
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Abstract
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