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Dissolution of MoS2 concentrate using NaClO from 283 to 373 K

This study analyses the leaching process of molybdenite (MoS2) concentrate using sodium hypochlorite (NaClO) at temperatures ranging from 283 to 373 K. The following variables were studied: leaching time, stirring velocity, temperature, NaClO concentration, NaOH concentration, particle size and liquid:solid ratio. The optimum parameters for molybdenite dissolution were: Time = 0.81 h, stirring speed = 800 rev min− 1, temperature = 303 K, NaClO concentration = 1.49M, NaOH concentration = 8.01M, particle size = 45 μm and liquid:solid ratio = 300 : 1. Under these conditions, molybdenite dissolution reached around 99%, while Cu and Fe recovery were insignificant. Analysis using XRD, QUESCAM and SEM showed release indices and subsequent reaction of the MoS2 and the constituent parts of Cu and Fe.