Method for efficiently removing copper through crude bismuth pot refining

Abstract

The invention discloses a method for efficiently removing copper through crude bismuth pot refining. The method is characterized by comprising the following steps: adding saw dust as a swelling agent in the process of adding sulfur to remove copper according to a mass ratio of sulfur to saw dust being 1 to 0.4, and mixing and stirring water with the saw dust to be uniform. Because the boiling point of water is 100 DEG C, the contact time of sulfur and melt can be effectively prolonged. According to the addition of mixed sulfur, copper can be efficiently removed from bismuth solution. Because the saw dust has the effect of the swelling agent, the defects that sulfur is agglomerated and has small contact area with the bismuth solution and the like are overcome, the sulfur utilization rate is effectively improved, the problems that sulfur is directly burnt and the sulfur utilization rate is low in the process of adding sulfur to remove copper are solved, and the direct recovery rate of bismuth is effectively improved.

Description

technical field

[0001] The invention relates to the technical field of metallurgical technology, in particular to a method for highly efficient copper removal in crude bismuth and bismuth pot refining. Background technique

[0002] At present, domestic recovery of bismuth from lead anode slime mainly uses bismuth pot refining to obtain refined bismuth products. During the bismuth pot refining process, most manufacturers use sulfur to remove copper. Because sulfur is flammable, it will directly float on the bismuth pot after adding it. On the surface of the bismuth melt, the sulfur is directly burned, and the sulfur floats on the liquid surface in a ball shape after being added to the pot, and gathers to the shaft of the mixer under the action of stirring, forming a block, which is easy to adhere to the bismuth, resulting in removal The content of bismuth in copper slag is more than 20%. At the same time, the utilization rate of sulfur is low, which increases the production ...

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