Aluminiumhydroxychlorid‐Flockungsmittel aus dem Kupferrecycling aus Abfällen der Leiterplattenproduktion

Abstract

Bei der Leiterplattenproduktion nach dem Druckverfahren fallen erhebliche Mengen kupferhaltiger Ätzlösungen an. Die Kupferrückgewinnung aus den ammoniakalischen Ätzbädern erfolgt über eine Zementation mit Aluminiumschrott mit Ausbringungsraten ≥ 99 % Cu. Anstelle der bis dato üblichen Deponierung wird die dabei anfallende aluminiumhaltige Lösung zu einem Koagulationsmittel für die Behandlung von Bergbautailings und Abwasser aufbereitet. Das hergestellte Flockungsmittel wurde eingehend charakterisiert und die Wirksamkeit als Koagulant für feindisperse Systeme im Jar‐Test untersucht und bestätigt.

Extreme Biomimetics: Designing of the First Nanostructured 3D Spongin–Atacamite Composite and its Application

“…Copper–ammonia waste contains copper in the form of a complex compound—copper (II) tetraamine chloride. [ 23 ] Traditionally, for the destruction of this complex compound, for example, hydrochloric acid is needed. However, in our case, the complex collapsed on contact with proteinaceous spongin, followed by the formation of a mineral phase with characteristic crystalline properties ( Figures 1e and ).…”

“…A model copper–ammonia etching solution ([Cu(NH 3 ) 4 ]Cl 2 solution; 60 wt% Cu) was prepared as described previously. [ 61 ] Purified spongin scaffolds of H. communis marine demospoge, porcine collagen standard and cellulose standard from Luffa aegiptica plant have been purchased from INTIB GmbH (Freiberg, Germany). The atacamite mineral standard was found in 1910 in Chuquicamata district, Chile.…”

“…During leaching, Cu 2+ oxidizes the elemental copper on the circuit board to Cu + , and when copper (II) concentration is getting low for effective leaching, the etching solution is exchanged. [ 23 ] In the study, we show for the first time that the insertion of ready to use 3D spongin scaffolds into this solution ( Figure ) leads to a chemical reaction between the organic template and inorganic ions with the corresponding formation of a new composite material, which contains spongin as organic, and crystalline atacamite (Cu 2 Cl(OH) 3 ) as the main inorganic phases. This reaction preserves the macroporous spongin matrix's integrity and obtains a multifunctional macroscopic construct that can be easily regenerated with real prospects for its application for practical purposes at a large scale (Figure S1, Supporting Information).…”