Method for recycling copper-containing wastewater from micro-etching
US12221366B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2024 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Aug 14, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/346
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for recycling a copper-containing wastewater from a micro-etching is provided, including: modifying a FeS material with a monomer including both carboxyl and sulfhydryl, a crosslinking agent, and a stabilizing and dispersing agent to obtain a FeS-based pH-responsive material CMC-FeS@HS #SiO2 #COOH, adding the FeS-based pH-responsive material to weakly-acidic copper-containing wastewater from the micro-etching to allow a reaction, and conducting processes such as sulfide precipitation, exchange, adsorption complexation, and flocculation precipitation to finally obtain a precipitate with CuS as a main component. This method makes full use of the pH responsiveness and abundant surface active sites of the FeS-based pH-responsive material, and can control a recovery rate of copper ions in the wastewater at 99.8% or more merely by adjusting a pH value of the copper-containing wastewater from the micro-etching.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.