The conventional technology for production of molybdenum from molybdenite concentrates consists of various steps which include roasting of the concentrates and finally reduction with hydrogen in two or more steps. In this study the effect of mechanical activation and aluminum on the carbothermic reduction of molybdenite in the presence of lime was investigated. 5%wt of aluminum was added to the powder mixture of molybdenite, Carbon and lime(1:2:2). Mechanical activation was performed on the mixtures in argon atmosphere, for different time periods(0-10hr) using a planetary ball mill. Different samples were thoroughly investigated by simultaneous thermal analysis (STA). The samples were heated in argon atmosphere with the linear heating rate of 10°C/min. The XRD result for samples, before and after milling demonstrated that by milling up to 5hr and more, before heating treatment, causing production of molybdenum and aluminum sulfide in the mixture, and after heating treatment, causing production of aluminum carbide in the mixture. Change in molybdenite crystallite size and structural micro strain studied based on integral breadth analysis of obtained XRD patterns. By mechanical activation, the grain size and structural strain of molybdenite decreased and increased respectively. The reaction fraction curves versus temperature revealed that starting temperature of the reaction for both samples without aluminum and with 5%wt aluminum and without mechanical activation, were 1040°C, but final reduction temperature of the reaction of sample with 5%wt aluminum compared to without aluminum was decreased about 260°C. Also both start and final reduction temperature of the reaction of sample milling for 10hr decreased 90°C compared to sample with 5%wt aluminum and without ball milling. It means the presence of aluminum increased the rate of reaction. Kinetics of molybdenite carbothermic reduction in non isothermal condition were studied by model-fitting (Coats-Redfern) and model free (Ozawa, Kissinger and tarink ) methods. It is also obtained that the Boudouard reaction was the controlling step in the carbothermic reduction of molybdenite in the presence of lime and 5%wt aluminum with 10hr milling. In the presence of aluminum, the solid state reactions occur in a very small amounts, also the Boudouard reaction be actives at lower temperatures. The reaction control model was F1. The activation energy and pre-exponential factor calculated 44.5kcal/mol , 2.26×10 12 s -1 respectively for milling 10hr. Keywords : Molybdenite, Aluminum, Mechanical activation, Kinetic, Carbothermic reduction