Oxidative leaching behavior of metalliferous black shale in acidic solution using persulfate as oxidant
(1. College of Physics and Mechanical & Electrical Engineering, Jishou University, Jishou 416000, China;
2. The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology
(the 2011 Plan of Hunan Province), Jishou University, Jishou 416000, China;
3. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
4. School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
5. School of Biology and Environmental Sciences, Jishou University, Jishou 416000, China)
2. The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology
(the 2011 Plan of Hunan Province), Jishou University, Jishou 416000, China;
3. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
4. School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
5. School of Biology and Environmental Sciences, Jishou University, Jishou 416000, China)
Abstract: The oxidative dissolution of metalliferous black shale in sulfuric acid solution using sodium persulfate as an oxidant was investigated. The effects of leaching factors including leaching temperature, leaching time, stirring speed, initial concentration of sodium persulfate and sulfuric acid and particle size on the leaching rate were studied as well. The leaching kinetics of molybdenum, nickel and iron from metalliferous black shale shows that the leaching rate is controlled by a chemical reaction through a layer on the unreacted shrinking core. The leaching process follows the kinetics model 1-(1-a)1/3=kt with apparent activation energies of 34.50, 43.14 and 71.79 kJ/mol for Mo, Ni and Fe, respectively. The reaction orders in sodium persulfate are 0.80, 1.01 and 0.75 for molybdenum, nickel and iron, respectively, while in sulfuric acid, these orders are 0.45, 0.75 and 0.50 for molybdenum, nickel and iron, respectively. In addition, the reaction mechanism for the dissolution of the metalliferous black shale was discussed.
Key words: metalliferous black shale; oxidative leaching; kinetics; sodium persulfate