RECOVERY OF PURE COPPER, LEAD AND TIN FROM BRONZE TURNINGS

摘要

This study aims to recover No. 1 copper, pure lead and tin metals from bronze scrap containing 9 95 lead, 8.62 tin and 80.1 copper and the rest is impurities. Synthetic copper sulfide, oxygen and sulfur dioxide gases are tested to oxidize lead and tin at 1100-1300℃. Results show that the efficiency of these reagents is in the order copper sulfide and oxygen and sulfur dioxide Pure No. 1 copper containing <0.4% lead and < 0.1% tin is successfully recovered at 1250℃ Hot ammonium acetate leaches lead from the slag leaving tin oxide as tailings Acidification of the acetate solution produces the respective salt. Pure lead and tin metals are recovered by thermal reduction of their oxides using carbon or hydrogen gas at 950℃-1000℃. The use of soda ash helps the slag to float more freely on the liquid phase of the molten bronze and make it easily skimming Athermodynamic model is suggested to interpret the findings. The activation energy values of the reactions involved are given. The efficiency of the method amounts to 94 6%.