Fused-salt electrolytic cell for producing rare earth metals and alloys

Abstract

The invention relates to a fused-salt electrolytic cell for producing rare earth metals and alloys, and the electrolytic cell comprises an electrolytic cell body, a cathode, an anode, a receiver, and a cover plate; and the electrolytic cell body is formed by nesting of a graphite inner liner, a carbon knotting layer, a fireproof heat-insulation layer, and a metal coat from inside to outside. The electrolytic cell is characterized in that, the sidewall of the electrolytic cell body is formed by two stages or more stages of arc surfaces which are connected with each other to form a closed state, and the electrolytic cell body is a non-enclosed type cell. The electrolytic cell has advantages of high current efficiency, a little amount of electrolytes for running a furnace, low unit consumption of graphite, long service life, balanced and steady quality of products, and low price; and the electrolytic cell is applicable to any scale productions greater than 1000 A, wherein the productions of rare earth metals and alloys are prepared by an electrolytic method of fluoride molten salt system oxide.

Description

technical field [0001] The invention relates to a molten salt electrolytic cell for producing rare earth metals and alloys, and belongs to the technical field of molten salt electrolysis. technical background [0002] The existing methods for producing rare earth metals and alloys are mainly fluoride molten salt system oxide electrolysis, and the electrolytic cells that have been used mainly have the following structures: (1) Japanese Patent No. 61-253391, the electrolytic cell is lined with tungsten , molybdenum and other metal materials, because tungsten, molybdenum and other materials are easily oxidized under high temperature conditions, so the electrolytic cell is a closed electrolytic cell filled with inert gas; (2) Japanese patent No. 62-146291, the electrolytic cell lining is Iron materials or stainless steel materials, when producing a single rare earth metal, the metal product will be polluted; (3) Chinese patent CN85100748A, the electrolytic cell is lined with int...

AI Technical Summary

Problems solved by technology

Since the lining is made of integral graphite, the scale of the electrolytic cell is limited by the size of the graphite, and the product quality stability is poor; (4) Chinese patent 98104785.8, the lining of the electrolytic cell is made of graphite blocks with convex grooves, and the exterior is Carbonaceous material or carbonaceous mixture knot layer, refractory insulation material, metal structure layer and insulation layer

The electrolytic cell can be built according to the scale, and the price is relatively low, but the power lines of the electrolytic cell are not evenly distributed, so that the raw materials are easy to deposit at the corners of the cell body, and the amount of electrolyte used for starting the furnace is large, which in turn affects the current efficiency and graphite anode. consumption

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