Plasma arc melting enrichment method and plasma arc melting enrichment device for recycling metal elements of platinum group

Abstract

The invention relates to a method and a device for recycling metal elements, in particular to a plasma arc melting enrichment method and a plasma arc melting enrichment device for recycling metal elements of a platinum group. The method comprises the steps of: mixing and grinding substances containing metal elements of the platinum group, ferric oxide, solid carbon reducer and fluxing agent in a dry method to be placed into a powder spraying tank, utilizing inert gases and / or reducing gases as carrier gases to convey materials in a suspension way so as to pass through an axial central hole of a graphite electrode of a plasma arc melting furnace adopting a close negative-pressure melting way, directly sending the materials into plasma arc to be reduced and melted and to enter a melting pool, utilizing iron collecting agent to collect and carry the elements of the platinum group so as to pass through a melted slag layer to enter a valuable iron melting layer, discharging glass-status melting slag and valuable iron out of a furnace body after standing, carrying out water quenching and granulating on the melting slag discharged from the furnace body, selecting the valuable iron particles or fine grains of the valuable iron to enter a wet metallurgic procedure together with the discharged valuable iron melting body, and continuously separating and purifying the metal elements of the platinum group.

Description

technical field [0001] The invention relates to a method and equipment for recovering metal elements, in particular to a plasma arc melting enrichment method and equipment for recovering platinum group metal elements, which can be obtained from substances containing at least one platinum group metal element, such as petrochemical industrial catalysts. A method for recovering platinum group metals from scrapped automobile exhaust purifiers, electronic circuit boards and the production of lead frames and scraps thereof. Background technique [0002] The traditional method of recovering platinum group metals generally uses aqua regia or other highly oxidizing mixed acids to cook and extract waste catalysts containing platinum group metal elements, etc., and finally separate and purify the precious metal elements. However, due to the polarization and passivation phenomenon of leaching and extraction of platinum group metals, the leaching rate is low, the production efficiency is...

AI Technical Summary

Problems solved by technology

However, the disadvantages of using copper as a collector are also very prominent. It requires standing still for a long time to make the copper particles in the slag completely settle down to the noble copper melt below. This not only brings difficulties to production, wastes energy consumption, and After the slag layer is discharged, it is difficult to recycle the precious metals remaining in it

In addition, from the perspective of reduction kinetics, the indirect heating of the plasma arc to melt the reduced material is not ideal.

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