Processing of rhenium

Processing of rhenium

Rhenium is smelted, pyrometallurgically (using conversion, smelting, and oxidation firing). During roasting, rhenium oxides are sublimed and then trapped by trap filters. Part of the rhenium is retained in the tinder, from which it is transferred to soda or ammonia solutions, from which the metal is later recovered by hydrogen. During smelting of copper concentrates, up to 60% of Re is volatilized with smoke. When processing copper concentrates, sulfuric acid wash acid becomes the main source for obtaining this metal. The ease of machining rhenium is due to the high plasticity of the metal in its pure form. Thus, it can be made into fine filament and foil by rolling without any additional influence by temperature or chemical reagents. At the same time, to increase the hardness of the workpiece, it is sufficient to apply nagging.

Powder metallurgy

Rhenium billets are produced using the powder metallurgy method. A stack is formed first. Then it is heated and forged on a special rotary forging machine. This produces rods Ø 2-3 mm, which are then, due to their high plasticity, drawn into the thinnest wire up to several microns in diameter.

Plastic deformation

Pure rhenium is much more ductile than tungsten. It can be rolled and drawn into the thinnest wire under normal conditions. The "rhenium effect" was also discovered: the metal was found to increase both the strength and ductility of molybdenum and tungsten. Because of its high modulus of elasticity, the hardness of rhenium increases significantly after machining due to accretion. To restore ductility, it is annealed in hydrogen, vacuum or inert gas.

Delivery

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