抄録
Acid leaching of indium-lead-tin alloy wire scrap has been studied. Anexperimental study was excuted to produce leaching liquor for subsequent separationof the concerned metals from the scrap material. Two leaching solutions were investigatedhydrochloric acid and hydrochloric-nitric acid oxidationleaching. Parameters affecting leaching processes such as time, temperature, acid concentration and acid: scrap stoichiometric ratio havebeen evaluated. Results obtained revealed that hydrochloric acid failed toextract metals completely, the maximum extraction efficiency was in the orderof indium 97.1, lead 94.1 and tin 89.2% by using 5M HCl for 6 hours at 95°C, HCl: scrap ratio was 5. Addition of nitric acid as oxidizing agent resulted incomplete extraction for metals, the optimum leaching conditions were conductedby addition of 0.6ml of 1:1HNO3/g scrap to the leachate of 5M HClfor 1.45 hours at 80°C with HCl: scrap ratio of 2.5. Another advantage forusing of HCl-HNO3 leaching was that about 71% of the lead content was separatedas pure crystals of PbCl2 on cooling the resulting solution.
