Process and apparatus for producing Dy-Fe alloy by molten salt electrolysis method

Abstract

The invention relates the dysprosium-iron alloy technology with fused salt electrolysis process and device, belonging to rare-earth products preparing field. The method comprises the following steps: at high temperature, dysprosium oxide melting at fluoride, dysprosium oxide beginning ionizing; at the condition of 95V/M direct current field, separating out Dy3+ on the surface of iron cathode, deacidizing Dy3+ to Dy, and alloying Dy and Fe to form Dy-Fe. O2- is oxygenated to O2 on the surface of graphite cathode, and it reacts with carbite to form CO2. The melting point of dysprosium-iron (20úÑFe) is 1046Deg.C, and the melting point of Dy is 1407Deg.C, so the electrolyzation is carried out at 1050Deg.C. The invention has the advantages of low investment, low cost, simple technology, continuous production and low impurity content.

Description

1. Technical field [0001] The invention relates to a process for producing dysprosium-iron alloy by molten salt electrolysis, and belongs to the field of rare earth product preparation. 2. Background technology [0002] The existing production methods of dysprosium iron in our country include fluoride vacuum calcithermal reduction method and oxide vacuum iron reduction diffusion method. [0003] The production process of fluoride calcithermal reduction method is relatively mature, and it is the main method for producing dysprosium and dysprosium-iron. However, the fluoride calcithermal reduction process requires complex vacuum equipment and expensive crucible materials because of the need for fluorination process and reducing agent calcium. The cost is high; the fluorination process pollutes the environment; the impurities such as O, Ca, F, and W in the product contain high content. [0004] The production process of iron oxide reduction diffusion method is difficult to pop...

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Problems solved by technology

[0007] The technical problem solved by the invention is: reduce the electrolysis temperature, so that the electrolysis can continue; reduce the melting point of the electrolyte, improve the fluidity and stability, environmental protection and energy saving, can continuously produce dysprosium iron alloy, and greatly reduce the production cost; and can make the electrolytic cell different A process and equipment for producing dysprosium-iron alloys by molten salt electrolysis, which can effectively electrolyze at all depths and prevent raw materials from accumulating at the bottom of the electrolytic tank

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