A kind of processing technology of high bismuth lead anode slime

Abstract

A treatment technology for high-bismuth and high-lead anode slime comprises the following steps: carrying out oxygen-rich reduction smelting on the high-bismuth and high-lead anode slime to produce noble bismuth, slag (lead slag) and soot (crude antimony white); delivering the lead slag to a lead system, delivering the crude antimony white to a bismuth system, carrying out vacuum distillation on the noble bismuth to produce crude silver, crude bismuth and tellurium slag, pyro-refining the crude bismuth to produce refined bismuth, delivering the tellurium slag into a tellurium recovery workshopto produce refined tellurium, blowing the crude silver a silver-smelting furnace to produce crude silver and bismuth slag, delivering the crude silver into a silver electrolysis workshop to produce silver and gold, delivering the bismuth slag into a converter, carrying out reduction matte smelting to produce noble bismuth and matte slag, returning the noble bismuth to the vacuum distillation process, and delivering the matte slag to an oxygen-pressure leaching copper electrodeposition process to produce cathode copper and lead-silver slag respectively, wherein the cathode copper is sold as aproduct, and the lead-silver slag is returned to the lead smelting system. The technology has the characteristics of simple process, high production efficiency, short cycle, high recovery rate of valuable metals, and low production cost.

Description

technical field [0001] The invention relates to a treatment process for high-bismuth-lead anode slime, which belongs to the field of metallurgy of non-ferrous heavy and precious metals. Background technique [0002] Lead anode slime is a by-product of crude lead electrolytic refining. It is a main raw material for the production of precious metals such as gold and silver, and is also a main raw material for recycling valuable metals such as bismuth, antimony, copper and tellurium. The lead anode slime containing bismuth is The main raw material for the production of refined bismuth, the traditional treatment method of anode slime containing bismuth and lead is to reduce and smelt the anode slime in a reverberatory furnace (or converter) into noble lead, and then oxidize the noble lead in the converter to produce coarse silver and bismuth slag. Crude silver is sent to electrolytic refining of silver to produce silver, gold, etc., while bismuth slag is reduced and smelted into...

AI Technical Summary

Problems solved by technology

Although the traditional process has the advantages of less investment in equipment, fast start-up, and convenient operation, the main content of crude bismuth produced by this process is usually only 50-70%, and there are many processes in the fire refining process, and the production cycle is long. The direct recovery of bismuth The rate is low, usually only 30-40%, the amount of refining slag is large, the amount of valuable metals retained is large, the capital occupied is large, and the production cost is high, so most domestic and foreign enterprises no longer use this process for production

[0003] On December 5, 2007, the Chinese Invention Patent Application Publication No. CN101082084A announced (Yang Yuexin et al.) the process of recovering and smelting refined bismuth from bismuth slag. , that is, the bismuth slag produced by the converter is mechanically crushed and then leached with hydrochloric acid solution. The separation effect of lead, gold, silver and bismuth copper is good, the quality of crude bismuth is good, and it is easy to refine. However, the wet process has a long production line and high operating requirements. A large amount of sodium chloride solution needs to be evaporated resulting in high energy consumption and high production costs

The front stage of this process is exactly the same as the traditional process, except that the process of adding zinc and removing silver is replaced by vacuum distillation during the refining of crude bismuth. Therefore, this process still has a large amount of refining slag, a large amount of valuable metals retained, and a low direct yield of bismuth. high production cost

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