نوع مقاله : علمی-پژوهشی
نویسندگان
1 دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر
2 تهران دانشکده مهندسی معدن دانشگاه صنعتی امیرکبیر
3 دانشکده مهندسی معدن دانشگاه صنعتی امیرکبیر
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
As the main resource of zinc metal production, zinc sulfide mineral has poor sulfuric acid dissolution due to an inactive sulfur layer. This research has done a comparative study on the mechanism and kinetics of acid leaching of sphalerite concentrate in the presence of iron salts such as nitrate, chloride, and iron sulfate. For this purpose, studies were done on a sphalerite concentrate containing 41.23% Zn, 26.24% S, and 6.6% Fe. The investigated parameters include ferric ion concentration, sulfuric acid concentration, temperature, time, solid-to-liquid ratio, and oxygen injection rate, each evaluated at 5 levels. The results indicate that the parameters of temperature, solid-liquid ratio, and ferric ion concentration had the greatest effect on the sphalerite dissolution rate. In the optimal conditions of sulfuric acid concentration 0.51 M, ferric iron 0.9 M, oxygen injection rate 2 L/min, reaction temperature 90°C, time 12 h, and the solid-to-liquid ratio of 50 g/L, recovery of zinc was obtained to be 94.85%. Kinetic investigations showed that, based on the shrinking core model, the sphalerite leaching rate control is based on the diffusion mechanism due to the high correlation coefficient compared to the chemical reaction mechanism.
کلیدواژهها [English]
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