Copper recovery from copper(II) sulfate solutions by reduction with carbohydrates

摘要: Abstract Copper(II) in copper sulfate solutions can be reduced with various carbohydrates to obtain a powder. The favorable conditions for Cu2+ reduction are intertwined hydrolysis and degradation of carbohydrates. effect parameters on these was tested series autoclave experiments, where the concentration (2–20 g/L), temperature (150–250 °C), initial solution pH value (1.5–5), time heat set-point (1–55 min) carbohydrate type were varied. Hemicellulose pentoses derived thereof appeared more effective reductants at lower temperatures (170–200 °C) acidities (0.01–0.1% w/w). recovery limited due (organic) acid build up reactions products copper. By increasing reductant concentration, total could increased by few percent. Only adjustment NaOH recoveries >99% obtained. Reduction times less than 20 min feasible 185 °C inserting temperature. characteristics recovered powder depended heavily experimental conditions.