Precious metal alloy purification and enrichment technology and oxidizing refining furnace

Abstract

The invention relates to a precious metal alloy purification and enrichment technology and an oxidizing refining furnace. The technology comprises the following steps of: carrying out reduction smelting on anode mud containing lead, bismuth and tin, separating a gold-silver alloy by using a vacuum furnace, and removing impurities by using the oxidizing refining furnace. The oxidizing refining furnace for the purification and enrichment of the precious metal alloy comprises a tunnel furnace body constructed by a furnace wall (1), a furnace roof (2) and a furnace bottom (3); and a hearth (8), ahearth base (9) and a moving furnace bed (10) are arranged below a furnace chamber space (4). The technology is simple and convenient, can reduce the production cost, increases the direct yield of gold and silver to 97.5 to 99%, and is environmentally-friendly and safe. The oxidizing refining furnace has the characteristics of large processing capacity, low energy consumption and high automation level.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy smelting, and in particular relates to a precious metal alloy purification and enrichment process and an oxidation refining furnace. Background technique [0002] The alloys containing precious metals obtained after enrichment, reduction, smelting and smelting of gold and silver-containing materials such as anode slime are called precious metal alloys, and their components vary depending on the source of the materials. The common ones are noble lead alloy, noble bismuth alloy, noble tin alloy, etc., because lead is the best collector for precious metals. Therefore, in the case of low lead content, lead is added to capture precious metals. Therefore, lead and silver are the main components of noble lead, and the content of other impurity metals varies with the source of the material. The gold content also varies with the material. The treatment of precious lead usually adopts pyro-...

AI Technical Summary

Problems solved by technology

[0004] 1) After the precious metal alloy is oxidized and refined by the silver separation furnace, the refining slag produced needs to be reduced and smelted again to produce the alloy, which increases the production cost;

[0005] 2) The direct recovery rate of gold and silver is low, about 92.5-93%

Although the agitator and the sealing cover adopted in this technical solution overcome the problems that the oxygen in the gas cannot fully reach the surface of the lead liquid due to the fact that the air inlet and the air inlet are all above the oxidation pot, resulting in low production efficiency and poor lead oxidation degree, the agitator Working in a high-temperature environment, the service life is very short, resulting in high production costs; and the molten lead oxide liquid stirred by the mixer is easy to gasify and volatilize, not only the lead oxide recovery rate is low, but also pollute the environment

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