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US-12098474-B2 · Sep 24, 2024 · US
Method for electrolytically refining lead in sulfamate bath
US10106904B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10106904-B2 |
| Application number | US-201514957370-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 2, 2015 |
| Priority date | Dec 3, 2014 |
| Publication date | Oct 23, 2018 |
| Grant date | Oct 23, 2018 |
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Abstract
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In the electrolytic refining of lead in a sulfamate bath, the production of a white residue is suppressed, and a decrease in the lead concentration in the electrolytic solution is suppressed. A method for electrolytically refining lead in a sulfamate bath, comprising performing electrolytic refining at a decomposition rate of sulfamic acid controlled at 0.06%/day or less.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for electrolytically refining lead in a sulfamate bath using a lead anode, comprising performing electrolytic refining using the lead anode which comprises 70 to 90 mass % of lead and 5 to 30 mass % of bismuth in the sulfamate bath in which 1 to 700 mg/L of nonionic surfactant comprising polyoxyethylene mononaphthyl ether is added at a decomposition rate of sulfamic acid controlled at 0.06%/day or less for at least 5 days to suppress a production of a white residue and decrease of the lead concentration in the sulfamate bath by adding sulfamic acid to the sulfamate bath, wherein the electrolytic refining is performed with the sulfamic acid concentration in the sulfamate bath adjusted to a concentration 20 to 60 g/L higher than lead concentration in the sulfamate bath and with the lead concentration in the sulfamate bath adjusted to a concentration of 60 to 80 g/L, and the electrolytic refining is performed with electrolytic solution temperature in the sulfamate bath adjusted to 15 to 30° C. 2. The method of claim 1 , wherein performing electrolytic refining comprises controlling a current density of electrolysis at 50 to 100 A/m 2 .
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Classifications
- C25C7/06Primary
Operating or servicing · CPC title
Cross-Sectional Technologies · mapped topic
of lead · CPC title
Recycling · CPC title
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- What does patent US10106904B2 cover?
- In the electrolytic refining of lead in a sulfamate bath, the production of a white residue is suppressed, and a decrease in the lead concentration in the electrolytic solution is suppressed. A method for electrolytically refining lead in a sulfamate bath, comprising performing electrolytic refining at a decomposition rate of sulfamic acid controlled at 0.06%/day or less.
- Who is the assignee on this patent?
- Jx Nippon Mining & Metals Corp
- What technology area does this patent fall under?
- Primary CPC classification C25C7/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 23 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).