Process for preparing rare earth-magnesium intermediate alloy by compound cathode molten salt electrolysis

Abstract

The invention discloses an electrolyzing rare earth-magnesium hardener preparing method, which is characterized by the following: realizing the coexistence of floating upward liquid magnesium cathode, subsidence liquid high concentration rare-earth magnesium cathode and medium density rare-earth magnesium liquid cathode; depositing electrochemistry on the emission surface of three dimensions; Improving productivity with the same ampere density; avoiding producing furnace accretion and improving product quality with the same deliverability; making the dendrite hard to generate on the surface of electrochemical deposition by moving dynamic cathode. The invention simplifies the electrolytic craft, which reduces the cost.

Description

Technical field: [0001] The invention relates to a preparation method of a rare earth-magnesium master alloy, in particular to a preparation method of a composite cathode molten salt electrolysis rare earth-magnesium master alloy. Background technique: [0002] Molten salt electrolysis produces metals or alloys, and increasing the electrolysis current is conducive to improving the single-cell production capacity of the electrolytic cell. However, the improvement of the electrolytic current of the cathode is limited by other conditions such as current density and temperature; if the current density is too high, negative effects such as furnace lumps, sludge, electrolytic slag, excessive turbulence of electrolyte, and out-of-control furnace temperature will seriously affect production and product quality. The cathode current density refers to the current intensity passing through the unit cathode surface. Obviously, in the case of a fixed maximum current density, using all mea...

AI Technical Summary

Problems solved by technology

However, the possibility of transplanting the method of producing monometallic magnesium to the production of magnesium master alloys has not yet been transformed into reality.

USP5,427,675 and USP5,279,716 patents applied by GM Corporation of the United States from 1994 to 1995, which disclose the production of metal Mg and Mg-Nd alloys by continuously adding MgO in a fluoride or chloride system. Invented a sub-green electrolysis process that reduces the emission of harmful gases from the anode, but there is no substantial improvement in the maximization of the cathode stereotype

In 2001, another Chinese patent No. 00267763 entitled "A New Type of Molten Salt Electrolyzer" was published by the Chinese Patent Office. This patent adopts a good measure of maximizing the cathode area to produce rare earth master alloys, but this measure has not yet been removed from the There is no substantive progress in the improvement of the expansion of the cathode area to the three-dimensional expansion mode of the two-dimensional plane