Cleaner Production

The original proposal for recovering the copper in high-quality form came from the U.K. Electricity Research Council. Using an electrolytic technique involving a divided cell (Figure 1.8), simultaneous

Cathode

Regenerated etchant

Copper-rich etchant

Cathode

Regenerated etchant

Copper-rich etchant

Controlled bleed

FIGURE 1.8 Electrolytic process. (From Wang, L.K. et al. Case Studies of Cleaner Production and Site Remediation, Training Manual DTT-5-4-95, United Nations Industrial Development Organization, Industrial Sectors and Environment Division, Vienna, Austria, April 1995.)

Controlled bleed

Copper flakes

FIGURE 1.8 Electrolytic process. (From Wang, L.K. et al. Case Studies of Cleaner Production and Site Remediation, Training Manual DTT-5-4-95, United Nations Industrial Development Organization, Industrial Sectors and Environment Division, Vienna, Austria, April 1995.)

regeneration of the etching solution and recovery of the unwanted copper is possible. A special membrane allows hydrogen and chloride ions through, but not the copper. The copper is transferred via a bleed valve and recovered at the cathode as pure flakes (Equation 1.2). In the electrolytic process:

This process was enabled by the development of a suitable cell-dividing material; a process development where the excess etchant is pumped to the recovery circuit and the copper is obtained in a recoverable form.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


Post a comment