Experimental Study on Beneficiation of Coarse Concentrate from Shizhuyuan Magnetite Mine

A small amount of magnetite is associated with the Shizhuyuan Tungsten Molybdenum Bismuth Fluorite polymetallic ore, the total iron grade is 7.15%, the iron grade in the magnetite is 1.68%, which is 23.50% of the total iron. “Shizhuyuan method” is used in the whole beneficiation process of the tungsten-molybdenum-bismuth-fluorite polymetallic ore, in which the magnetite is preferentially removed by medium magnetic separation before recovering tungsten, molybdenum, bismuth, fluorite and other useful minerals, in order to avoid the interference of magnetite to the subsequent separation operation, the coarse magnetite concentrate is produced. In order to further improve the comprehensive utilization rate of mineral resources and excavate the new economic growth point of the mining enterprises, it is decided to carry out the experimental study on beneficiation of coarse concentrate of magnetite ore. Through the study on the properties of the magnetite coarse concentrate, it is found that the magnetite coarse concentrate has fine particle size distribution and high magnetic sulfur content. In order to improve the quality of magnetite concentrate, the grade of iron in magnetite concentrate must be raised, and the sulfur content in magnetite concentrate must be reduced. To raise the iron grade of magnetite concentrate, fine grinding method is used to separate magnetite from its monomer, and then the iron grade of magnetite concentrate can be raised by weak magnetic separation, while to reduce the sulfur content of magnetite concentrate, reverse flotation is generally used to remove sulfur, it is necessary to find out the process flow and parameters of reverse flotation desulfurization suitable to the property of the ore in order to ensure the efficient removal of magnetic sulfur from magnetite ore. After the systematic experimental study on beneficiation, it is determined that the final magnetite concentrate quality can be greatly improved by first demagnetizing, then by reverse flotation, and then by stage grinding. When the magnetite rough concentrate grade TFe 38.19% and S 4.51% , the final magnetite concentrate grade TFe 60.85% , S 0.99% and iron recovery 72.13% can be obtained. The process has been applied in the field, and good results have been achieved by optimizing the configuration of the field flow structure.