Heavy metal extraction from PCB wastewater treatment sludge by sulfuric acid

Recovery of ultrafine copper particles from metal components of waste printed circuit boards

“…Sulfuric, hydrochloric and nitric acid solutions are often used as leaching agents in hydrometallurgical treatments (Havlik et al, 2010;Kuan et al, 2010;Roy and Buckle, 2009). In these cases, however, the separation process tends to become complicated because of poor selectivity during leaching (Kazuya et al, 2006).…”

Optimalization of Metals Ions Extraction from Industrial Wastewater Sludge with Chelating Agents / Optymalizacja Procesu Ekstrakcji Jonów Metali Z Przemysłowych Osadów Ściekowych Za Pomocą Roztworów Związków Chelatujących

“…The mobility of zinc, cadmium and copper was higher than the mobility of lead and nickel. Extraction effi ciencies of various metals, presented in the literature, are different [10,14] independently of an extractant type.…”

“…Generally EDTA, citric acid and other chelators were reported as useful agents for metals ions removal from industrial [10,13] and municipal sewage sludge [1], water sediments [6] as well as soil [18].…”

“…Recently different chemicals have been reported as an effective agents for extraction of metals from sewage sludge, e.g. nitric acid [4], sulfuric acid [10], ferric sulfate [8]. But chelating agents such as EDTA (ethylenediaminetetraacetic acid) and citric acid seem to be very promising.…”

Cheminės Ekstrakcijos Metodo Taikymas Nikeliu Užterštam Dirvožemiui Valyti

“…Ekstrakcijoje naudojamos trys organinės rūgštys: vyno, acto bei citrinos. Atsižvelgiant į užsienio mokslininkų atliktus tyrimus, naudotos tokios rūgščių koncentracijos: 0,05, 0,1, 0,2, 0,35 ir 0,5 M (Kuan et al 2010;Zhang et al 2013;Wang et al 2015). Siekiant nustatyti optimalias ekstrakcijos sąlygas ir parametrus, ištirti 63 dirvožemio mėginiai.…”