Experimental Study on New Process for Selective Reduction and Separation of Boron-Bearing Iron Concentrate

In view of disadvantages of present boron and iron separation technology,a new process for selective reduction and separation of the boron-bearing iron concentrate was proposed,which was verified by the thermodynamic feasibility analysis and laboratory tests.The laboratory experiments indicated that for the boron-bearing iron concentrate in Fengcheng city of Liaoning province with Fe and B2O3 mass fraction of 56.05% and 3.86%,respectively,the optimized parameters of selective reduction and separation were as followed: the carbon ratio 0.8~ 1.0,the reduction temperature 1 275~1 300 ℃,the reduction time no less than 20 min,the particle size of coal about 0.075 mm and the magnetic field strength of the separation 50 mT.The selected product was the iron powder with high metallization,which could be used in steel production through further processing.The tailings of separation were high grade sources containing boron,which could be used as the superior raw material in boron industry.