（1. Technology Center, Panzhihua Bingyang Technology Co., Ltd., Panzhihua 617064, Sichuan, China 2. School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408000, China 3. New Metallurgy Hi- Tech Group Co., Ltd., China Iron and Steel Research Institute Group, Beijing 100081, China）
Abstract：Aiming at the problems of metallurgy iron- bearing dust with high impurity content and serious environmental pollution due to the small particles, the ultrafine iron powder was prepared by the purification and separation- reduction method. By wet method reaction, magnetic separation, flotation and other impurity removal and purification processes, the mass fraction of SiO2 in the iron- bearing dust reduced to 0.12%, while the mass fraction of CaO, MgO decreased in different degrees at the same time. The reduction test results of the iron- bearing dust after the separation of impurities showed that under the atmosphere of H2, the TFe mass fraction of the ultrafine iron powder reached 99.27% after the reduction under thermal insulation at 750 ℃ for 1 h. The average size and the specific surface area of the observed microscopic morphology particle were about 1 μm and 2.495 m2/g, respectively. After pressing and sintering tests, it showed that the obtained ultrafine iron powder was easy to be pressed and formed, and the particle presented excellent sintering activity. The sintering temperature of the pressed shaped body was around 850- 900 ℃, which was obviously better than that of the conventional reduced iron powder.
2018, Vol. 28 
