Study on Process Mineralogical Characteristics and Optimization of Magnetic Separation Process of an Iron Ore Mine in Hainan
Aiming at the problem of declining product quality in mineral processing caused by the change of mineral source in an iron ore mine in Hainan,the process mineralogy study on the raw ore was conducted through the field sampling,obtaining the mineral composition and mass fraction,the process mineralogical characteristics of main minerals were analyzed,and the crushing classification and magnetic separation dry throwing tests were carried out.The research results indicate that,the main compositions of the ore are quartz as well as iron-containing minerals,of which,magnetite accounts for 8.4％of the total mineral content,and the internal iron content is as high as 59.86％.Magnetite is less contiguous with other iron minerals,but is closely embedded with quartz,which is unfavorable to beneficiation,and it should be focused on strengthening the intensity of grinding.The results of crushing classification and magnetic separation dry throwing tests indicate that,after crushing and grading of the raw ore,the products with two grain sizes of 10-20 mm and less than 5 mm can be obtained.According to the grain size distribution,the optimal magnetic separation field strength of 10-20 mm grain size should be set at 1500 GS,and the optimal field strength of raw ore less than 5 mm grain size should be set at 1000 GS.After the process optimization,the grade of iron concentrate product is more than 30％with a yield of 17.37％,and the iron recovery rate is 38.35％.The yield of machine-made sand is 27.07％,and the yield of gravel is 55.56％,which can meet the requirements of fully and efficiently utilizing ore resources in mines.
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