Dynamic Crushing and Energy Consumption Mechanism of Magnetite Based on Mineral Characterization Analysis
In order to study the crushing characteristics and energy consumption law of magnetite under dynamic load,a sedimentary metamorphic magnetite was taken as the research object,and the impact crushing test of magnetite was carried out by using a separated Hopkinson pressure bar.The dynamic characteristics,crushing energy consumption and crushing morphology of the magnetite were analyzed based on the theory of mineral characteristics.The results show that the stress-strain curve of magnetite presents three stages under impact load:elastic stage,crack evolution stage and unloading stage.With the increase of incident energy,the crushing energy consumption and energy consumption density increase continuously,and the crushing average diameter decreases with the increase of energy consumption density.Under low incident energy,the energy is stored in the form of elastic energy inside the quartz particles,and when the stress wave action is over,the energy is released for the expansion of the original cracks,destroying the internal structure of the specimen.Under high incident energy,the rate of storing elastic energy in quartz particles is accelerated,reaching the storage limit faster,and the internal energy is released rapidly.The original fissures are expanded rapidly and a large number of along-crystal fissures and through-crystal fissures are generated,and the internal structure of the specimen is seriously damaged.The composition of magnetite is mainly quartz.The structural,construction and contact relationship of the ore are simple.The structure is mainly crystalline structure and metasomatic structure.The construction is mainly strip construction and block construction.The mineral particles are in linear contact,and the crushing is mainly along-crystal rupture and through-crystal rupture,with stepped and serpentine rupture morphology.
MagnetiteStructural and constructionCrushing characteristicsCrushing energy consumption
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