Research On Experiment Of Iron Ore Large-Vibration Elastic Fine Screening Process

China’s iron ore resources have poor quality,and the proportion of low-grade resources is high,which cannot meet the demands of domestic steel production enterprises.The development of high-level technology,processes,and equipment for iron ore exploitation and utilization is urgently needed.Mineral processing is the basis and prerequisite for the development and utilization of iron ore.Screening operation is the key unit in mineral processing.Low-grade iron ore has characteristics such as a high content of fine particles and severe sludge formation.The traditional screening process makes it easy to bond into lumps and form a covering film between the sieve holes.The obstructive particles close to the size of the sieve holes or the difficult-to-screen particles are easily stuck in the sieve holes,causing serious blinding,leading to low screen utilization and poor screening effect.This study proposed a strong vibration elastic screen surface and conducted research on the kinematic characteristics,particle movement,and sieving behavior of the strong vibration elastic screen surface.It explored the effect of influencing factors on the screening effect of strong vibration elastic fine particle screening and further optimized the elastic screen surface structure to improve the fine particle screening effect and achieve efficient fine particle screening of iron ore.The time-frequency response characteristics of the motion parameters(acceleration,velocity,displacement)in different areas of the screen surface and the screen body were studied using a screen surface kinematic data acquisition and analysis system.The deformation of the strong vibration elastic screen surface mainly occurred in the z-direction,and the average amplitude of acceleration,velocity,and displacement in the middle area of the screen surface(measurement point 3)was greater than that of other measurement points.The spatial trajectory of different regions of the elastic screen surface was constructed,and the spatial trajectory of the middle area of the elastic screen surface(measurement point 3)was the most complex.By changing the fixation method of the strengthening rib and the elastic screen surface,optimizing the elastic screen surface structure,analyzing the changes in kinematic parameters in the z-direction of different screen surface structures,and establishing the relationship expression between the average acceleration amplitude and the exciting force and frequency of the strong vibration elastic screen surface and the screen body side plate in the z-direction.The strong vibration elastic screen surface can achieve a large vibration motion mode under the condition of small vibration of the screen body.Particles’movement behavior during iron ore’s elastic screen surface screening process was recorded and analyzed using a screen surface particle acquisition and analysis system.The motion state of the particles on the elastic screen surface at different times was analyzed.The results show that the average migration time of the particles on the screen surface increases,and the average migration speed decreases,as the particle size decreases.The particles movement behavior on different elastic screen surface structures of iron ore was different,and the average migration time and speed of characteristic particles on different elastic screen surface structures also changed.When the material group of iron ore is screened through the strong elastic vibration screen surface structure(6),the average migration time of the particles in the front half of the screen surface was significantly shorter than that in the back half.The average migration time of the characteristic particles decreased with the increase of exciting frequency and force,and the average migration speed increased with the increase of exciting frequency and force.Fine particle screening experiments with strong vibration elastic screen surfaces were carried out,and the influence of experimental parameters such as exciting frequency,exciting force,and processing capacity on the screening effect was clarified in order.The optimal experimental parameter combination was determined:when the exciting frequency is 16.67 Hz,the exciting force is 7.66 k N,and the processing capacity is 15.42 t/(h·m~2),the screening effect is the best.