| 摘要 |
PROBLEM TO BE SOLVED: To obtain high quality lead by effectively removing tin from lead including a large amount of tin derived from recycling raw materials as impurities.SOLUTION: A soda treatment method in lead refining includes: a first soda treatment (S2) of dissolving tin-containing crude lead at a temperature, at which tin is melted, to subject the crude lead to soda treatment and removing a formed molten tin sodium salt; and a second soda treatment (S3) of subjecting the crude lead obtained through the first soda treatment to soda treatment at a temperature lower than that in the first soda treatment. In the first soda treatment, a molten tin sodium salt layer is formed at an upper part of a lead melt, and the upper part of the melt is separated as impurities. |
