In order to find the relationship between grinding fineness and concentrate grade under the best conditions of column weak magnetic separation,optimization tests were carried out on the rising water flow velocity,roughing magnetic field,scavenging magnetic field and magnetic field variation period of column weak magnetic separation.The best parameters were used for separation tests with different grinding fineness,so as to fit the relationship curve between grinding fineness and concentrate grade.The results show that under the conditions of rising water velocity of 26.5 × 10-2 m·s-1,roughing(constant)magnetic field current of 2 A,scavenging magnetic field current of 1.1 A,magnetic field variation period of 3 s,and the grinding fineness(-0.074 mm content)of 92.65％,the iron concentrate with grade of 70.65％is obtained.The fitting curve has been verified by the test results of grinding fineness(-0.074 mm content)at 92.65％,and the error is 0.01％.Combined with VSM and SEM results,it is determined that the optimal feed particle size(d50)of column weak magnetic separation should be maintained at about 25.7 μm.In theory,the fitting curve has achieved the purpose of predicting the grade of column separation in advance,which provides preliminary research for the realization of intelligent column separation by deep learning,and provides a theoretical support for the optimization of magnetic system of column cleaning equipment.
关键词
铁精矿/柱式弱磁选/磨矿细度/精矿品位/分选规律
Key words
Iron concentrate/Column weak magnetic separation/Grinding fineness/Concentrate grade/Separation rule
维普
万方数据