Experimental Study On The Preparation Of High-quality Iron Concentrate Based On Dahongshan Magnetite Concentrat

Iron concentrate serves as the primary raw material for the production of iron and steel.Its quality plays a crucial role in determining the economic benefits of iron ore processing enterprises and the overall quality of subsequent iron and steel production.In recent years,the quality requirements for iron concentrates as raw materials for iron smelting have significantly increased.This is largely due to the growing demand for energy-saving and low-carbon green options in iron smelting,as well as the implementation of high-standard environmental protection policies.Additionally,the gradual shift from blast furnace technology to non-blast furnace technology has also contributed to this trend.Therefore,the development of high-quality iron concentrate preparation technology will be of great significance to the realization of the"double carbon"goal of the iron and steel industry,but also bring huge economic benefits for the iron ore separation plant.This has a strong market competitiveness in both the realization of environmental protection requirements and the improvement of product quality.In this paper,on the basis of referring to the relevant literature,taking Dahongshan magnetite concentrate as the research object,the preparation of high-quality iron concentrate based on the ordinary iron concentrate of the concentrator was studied.Process mineralogy research shows that the main valuable metal in raw ore is Fe element,the content of TFe is 64.46%,Si O₂is the main gangue component,the content is 6.05%.Fe is mainly distributed in magnetite with a distribution rate of 83.08%,and in hematite and limonite with a distribution rate of14.77%.Dahongshan iron concentrate is a mixed concentrate of magnetite,hematite and limonite.The magnetite monomer has a higher degree of dissociation,but there are still 8.27%rich coenobium.The degree of monomer dissociation of hematite and limonite is not sufficient,and the content of monomer reaches 28.47%.Based on the properties of raw ore,the paper adopts the purification and recovery scheme of"grinding,low intensity magnetic separation-cationic reverse flotation"to carry out experimental research.The optimum process conditions of low intensity magnetic separation and reverse flotation were obtained by adjusting and optimizing the process parameters of each stage.The low intensity magnetic separation test of raw ore adopts the process of one roughness,two cleanness and one sweepness,and the magnetic field intensity of roughing,cleaning and sweeping is152.00m T,120.30m T and 175.00m T respectively.The reverse flotation of tailings of low intensity magnetic separation adopts the process of one roughness and one cleanness.Under the optimum conditions of the whole process,the obtained low intensity magnetic iron concentrate is high-quality iron concentrate.At the same time,an ordinary iron concentrate composed of low intensity magnetic separation cleaning tailings,low-intensity magnetic separation sweeping concentrate and reverse flotation concentrate is obtained.The TFe grade of high-quality iron concentrate reaches71.12%and the Fe recovery rate is 68.02%.And the content of Si O₂in high quality iron concentrate is only 1.30%,the proportion of magnetic iron is more than 98.00%,the content of Al₂O₃is only 0.23%and the content of P is only 0.03%,which meets the requirements of sponge iron production.The common iron concentrate with TFe grade of 60.72%and Fe recovery of 25.46%,which can be used as the iron concentrate of ordinary blast furnace smelting.Finally,the comprehensive recovery of Fe reached 93.48%,realizing the efficient utilization of iron resources.