Extraction of Niobium from the Bayan Obo Tailings by 'Flotation-Microwave Magnetic Roasting-Magnetic Separation'

摘要

In this paper, the method of "floatation-microwave magnetic roasting-low intensity magnetic separation" which aims to utilize the iron and Nb mineral in the Bayan Obo tailings was investigated. The results show that the method of "floatation-microwave magnetic roasting-magnetic separation" is effective and simple, and the recovery of iron and Nb in the whole process is up to 80% and 68% respectively. The step of microwave magnetic roasting is researched carefully, and the best magnetic roasting result is obtained at 650°C, and the roasting time is 10min. The best result of magnetic separation is obtained at the magnetic intensity of 220KA/m. Iron ore concentrate separated by magnetic separation can be used for iron making directly because the grade can reach about 62～64.4%. And the grade of Nb can reach up to 2.16%.