During the roasting process of molybdenum concentrate,the sintering phenomena such as partial melting,lumping and agglomeration of powder caused by the transformation of accessory elements and their interaction with molybdenum disulfide greatly affect the quality of molybdenum calcine and furnace life.This article studied the effects of impurities(types and contents)and roasting temperature during the roasting of molybdenum concentrate on the sintering behavior.The sintering degree was quantitatively calculated,and the microscopic morphology of the bonding forms of each component in the sintered material was observed.The results show that SiO2 and Al2O3 in molybdenum concentrate have little effect on the roasting and sintering behavior of molybdenum concentrate,while CaO,MgO,Fe2O3,CuO,and K2CO3 in molybdenum concentrate strengthen the sintering behavior;the agglomeration phenomenon will be intensified when the reaction temperature reaches the critical temperature of MoO3 and molybdate eutectic;increasing the content of CaO,CuO and K2CO3 has the greatest influence on the sintering behavior of molybdenum concentrate.The bonding forms between each component in the sintered material can be divided into three types,that is,isolated after adding SiO2 or Al2O3,crossover after adding CaO or MgO,and coated after adding Fe2O3,CuO or K2CO3.
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