Technology for recovering valuable metals from noble metal slag

Abstract

The invention discloses a technology for recovering valuable metals from noble metal slag. The technology comprises the following steps of: smelting the noble metal slag and a solvent in a rotary top blowing furnace to obtain lead bismuth alloy, wherein the noble metal slag comprises Au, Ag, Bi and Pb; electrolyzing the lead bismuth alloy under the current density of 60 to 110 A / m<2> to respectively obtain cathode lead and lead anode mud; refining the lead anode mud to respectively obtain bismuth and silver zinc shells; and respectively extracting gold and silver from the silver zinc shells. According to the technology, the rotary top blowing furnace is used as a smelting device, and the solvent proportion is regulated, so that the valuable metals such as gold, silver, bismuth and lead are enriched in the lead bismuth alloy, low gold, silver, bismuth and lead content of the reducing slag is ensured, and the comprehensive recovery rate of the gold, the silver, the bismuth and the lead in the noble metal slag is improved.

Description

technical field [0001] The invention relates to the technical field of metal recovery, in particular to a process for recovering valuable metals from precious metal smelting slag. Background technique [0002] Precious metals have unique physical and chemical properties and are widely used in various fields such as military industry, petroleum, chemical industry, organic synthesis, microelectronics technology and exhaust gas purification, and play an irreplaceable role in modern high-tech industries. For precious metal ore, if it can reach the gram / ton level, it is already a rich ore and has industrial mining value. However, in the smelting slag produced by pyroprocessing precious metals, especially the smelting slag produced by pyroprocessing copper anode slime and lead anode slime, the slag is rich in valuable metals such as gold, silver, bismuth and lead. The smelting slag produced by treating copper anode slime and lead anode slime by multi-fire method, the composition ...

AI Technical Summary

Problems solved by technology

[0003] The general treatment process of precious metal smelting slag is: return to the lead smelting system or copper smelting system of the smelter for further recovery of gold and silver. However, neither the lead smelting system nor the copper smelting system can realize the comprehensive recovery of valuable metals in the precious metal smelting slag

For example, the lead smelting system can only recover gold, silver, and lead, but cannot effectively recover bismuth, and at the same time, the recovery time is long and the recovery rate is low; the copper smelting system can only recover gold, silver, but cannot recover lead, bismuth, and returns to copper smelting at the same time The system will cause lead to form a vicious circle in the large system, affecting the copper smelting system and copper electrolysis system, and the process is long and the recovery rate is low

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