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Metal extraction from (a) Severn Trent cake when treated with [Hmim]Cl for 45 min with S/L = 0.1 at temperatures 25–120 °C. (b) Severn Trent cake when treated with [Hmim]Cl at 120 °C for 15–60 min with S/L = 0.1. (c) Severn Trent Cake when treated with [Hmim]Cl at 120 °C for 45 min for S/L loadings from 1/10 to 1/1 (w/w).
