Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1989-05-01
1990-08-21
Stoll, Robert L.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
204DIG13, 210759, 210912, C22B 346
Patent
active
049503260
ABSTRACT:
Removal of dissolved copper from solution according to the present invention involves treatment of waste solutions such as electroless copper overflow solutions with aluminum particles under reaction conditions promoting precipitation of dissolved copper from solution as metallic copper. Copper plating solutions having high concentrations of dissolved copper are inactivated in overflow reservoir (12) by addition of an inactivating agent from reservoir (14) to prevent plating of metallic copper onto vessels and conduits during collection, storage and/or transport of the solution. Inactivation of the copper plating solution is followed by precipitation of dissolved copper from solution as metallic copper in reaction vessel (20) by addition of aluminum particles from reservoir (24). Reducing agent and caustic agent may also be added to the reaction vessel from reservoirs (22) and (26), respectively, to yield a purified solution which is substantially free of dissolved copper and suitable for discharge after pH adjustment.
REFERENCES:
patent: 3666447 (1972-05-01), Saubestre
patent: 3674466 (1972-04-01), Anderson
patent: 4082546 (1978-04-01), Wallace
patent: 4092154 (1978-05-01), Dietz, Jr.
patent: 4420401 (1983-12-01), Kretas
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R. E. Wing, "Treatments for Complex and Chelated Rinsewaters," pp. 3, 4 and 19, Part of a Short Course Sponsored by AESF, Jan. 1988.
R. E. Wing, "Emerging Treatment Technologies for Removing Metals," pp. 9-15, Part of a Short Course Sponsored by AESF, Jan. 1988.
R. E. Wing et al., "Treatment of Complex Copper Rinsewater with Insoluble Starch Xanthate," Plating and Surface Finishing 65:52 (Dec. 1978).
Bos Steven J.
Speckman Ann W.
Stoll Robert L.
Tektronix Inc.
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