Recovery of Cu-concentrates from waste galvanic copper sludges

Recovery of Cu and Fe from Printed Circuit Board waste sludge by ultrasound: Evaluation of industrial application

“…In the ultrasonic assisted leaching process used at the heavy metal recovery plant in Huizhou city, with the raw PCB waste sludge containing 3.14-4.85% copper and 3.71-4.23% iron, the copper and iron recovery efficiencies reached 95.2-97.5% and 97.1-98.5%, respectively. The conventional hydrometallurgical processes normally extract copper with recovery efficiency of 80-85% [12,34,35].…”

“…Oishi et al [11] introduced a high purity copper recovery process from disposed PCB by using ammonia-ammonium sulfate and chloride systems. In general, due to high investment and operational costs, the above discussed techniques have so far been applied only on the laboratory or pilot scales [12]. In order to realize sustainable development of natural resources, it is essential to find a reliable and costeffective heavy metal recovery technique that not only can be used for industrial applications, but also does not pose any secondary pollution threats to the environment and public health during separation and recovery.…”

Stabilization/solidification of galvanic sludges by asphalt emulsions

“…Metal recovery from galvanic sludges has been under study [3][4][5][6][7], but it is not being realized at present and will probably not be easily implemented on a technical scale in the case of a galvanizing plant carrying out a wide range of electroplating treatment owing to the mentioned presence of a number of metals and employed chemicals.…”

Extraction and recovery of chromium from electroplating sludge

“…Promising results have been obtained by combining relatively difficult and expensive methods like conventional liquid-liquid extraction, ion exchange, and/or electrochemical separations. These attempts, however, have not advanced beyond the laboratory or pilot plant scale [9,10].…”