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Optimization of gold recovery from copper anode slime by acidic ionic liquid
Aydın Rüşen,Mehmet Ali Topçu 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
Hydrometallurgical gold recovery from primary or secondary sources is mainly based on a cyanide process, which is very dangerous for the environment due to the high toxicity levels. In view of the environmental effect, the present study proposes a new green solvent called 1-ethyl-3-methyl-imidazolium hydrogen sulfate (EmimHSO4) ionic liquid (IL) to recover gold from copper anode slime (CAS). The optimum leaching conditions for maximizing gold recovery were determined by orthogonal array (OA) of Taguchi’s experimental design method. OA L16 (44) including four parameters with four levels each, was used to examine the effects of IL concentration (20%, 40%, 60%, 80% v/v), temperature (25, 50, 75, 95 oC), time (½, 1, 2, 4 h) and solid/liquid ratio (1/10, 1/15, 1/20, 1/25 g/mL) on leaching efficiency of the gold recovery. Statistical analysis of variance (ANOVA) was used to determine the relevance between experimental conditions and gold recovery. The selective leaching tests results showed that gold recovery up to 89.07% was attained on laboratory scale under the optimum leach conditions: 80% IL concentration, 75 oC, 4 h and 1/25 g/mL solid/liquid ratio. According to these results, EmimHSO4 IL provides a very good ambiance for the oxidative leaching of gold and can be offered as an alternative leaching agent instead of harmful cyanide-based solvents.
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Mehmet Ali Topçu,Aydın Rüşen,Sadık Alper Yıldızel 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Anode slime which is produced by electrolytic refining of copper, is a significant source of copper production. However, conventional recovery methods for copper are characterized by complex process, hugeamount of strong acid consumption and hazardous acid waste. Therefore, novel, green, and highperformanceprocess for copper separation was developed. In this paper, a hydrometallurgical processfor copper recovery from copper anode slime was proposed with ionic liquid leaching – precipitation –calcination routes. 1-butly-3-methyl imidazolium chloride (BmimCl) was used as a leaching agent. According to the hybrid Taguchi/Box-Behnken optimization, the optimum leaching conditions for copperleaching were determined as 80 % of ionic liquid concentration, 95 C of temperature, 4.5 h of time, and0.07 of solid/liquid ratio. Validation tests performed under optimum leach conditions confirmed the feasibilityof the model and 95 % of copper leaching efficiency was obtained. Precipitation with ammoniumhydroxide solution at room temperature and calcination at 600 C processes resulted in a highly purecopper recovery as CuO. Also, under optimum conditions, highly soluble lead was easily separated afterfiltration by cooling in the form of PbSO4.This hydrometallurgical process is found to be simple, environmentallyfriendly, and adequate for the recovery of copper from copper anode slime.
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