Lime-enhanced hydrogen reduction of molybdenite

Reaction kinetics of direct hydrogen reduction of molybdenum disulfide in the presence of lime: A single pellet experimental investigation

“…It can be noted that only 15 min is enough at 1373 K for complete conversion for a pellet of 4 mm thickness with a solids mixing ratio of = 3. Mankhand and Prasad [19] reported about 1 h for complete conversion of 600 mg of fine powders of molybdenite concentrate at 1273 K and solid mixing ratio 3, while this time is less than 50 min for a pellet with 4 mm thickness and otherwise the same conditions. All further experiments were carried out at 1273 K. It should be noted that 1000 cm 3 min −1 gas flow rate was used for all the experiments in the current study.…”

“…To the authors' knowledge, Mankhand and Prasad reported the only other published study on reduction of MoS 2 by hydrogen in the presence of lime whereby the solid reactant is completely converted to metallic molybdenum [19]. Their work was related to reduction experiments on a mixture of lime and molybdenite powder.…”

“…Among the proposed methods, leaching [2][3][4], electro-oxidation [5][6][7][8][9][10], bioleaching [11][12][13], and chlorination [14,15], appear to be potential routes for treating molybdenite concentrates. However, another concept for extraction of metals from their sulfides is their direct reduction in the presence of a suitable metal oxide with desulfurizing capability [16][17][18][19][20][21][22][23]. This general scheme, for reduction of molybdenum sulfide with lime as the desulfating metal oxide [16][17][18][19] can be represented by the following reactions:…”

“…However, another concept for extraction of metals from their sulfides is their direct reduction in the presence of a suitable metal oxide with desulfurizing capability [16][17][18][19][20][21][22][23]. This general scheme, for reduction of molybdenum sulfide with lime as the desulfating metal oxide [16][17][18][19] can be represented by the following reactions:…”

Recovery of Molybdenum from Copper Slags

“…[5][6][7][8][9][10][11] Most of these studies mainly focused on the hydrometallurgical approach that required the precise control of pH, density of Mo solution, and operation temperature as well as Mo dissolution facilities. In the present study, the recovery of Mo as Fe-Mo alloy by the carbothermic reduction of molten Cu slags has been investigated since Mo is mainly used as a resource for Fe-Mo ferroalloy that is used to improve the steel's mechanical properties.…”