Abstract：The secondary resources in nickel slag can be effectively utilized by direct coal-based reduction. The growth characteristics and rules of metallic iron particles during the direct coal-based reduction of nickel slag under different conditions was described quantitatively, providing theoretical support for the development of subsequent grinding and magnetic separation processes, so as to achieve the purpose of efficient resource utilization of nickel slag. The microstructure of iron particles was observed by the scanning electron microscope. Image-Pro Plus Image analysis software was used to detect and analyze the size of metallic iron particles. The metallization rate of the reduced samples was measured. The results indicate that the coal-based direct reduction technology can effectively reduce the iron resources in nickel slag; the metallization rate of products shows a trend of first increasing and then stabilizing, and finally reaches 91.89% at 1 250 ℃ and 60 min;the average size of metallic iron particles in the reduced samples of nickel slag increases with the increase of time and temperature, and the increase of temperature is beneficial to the aggregation and growth of metallic iron particles in nickel slag; the average size of iron particle in the reduced samples increases up to 10.3 μm when the temperature is 1 250 ℃ and the reduction time is 60 min.
李小明, 李怡, 邢相栋. 镍渣煤基直接还原过程中金属铁颗粒的生长特性[J]. 钢铁, 2020, 55(3): 104-109.
LI Xiao-ming, LI Yi, XING Xiang-dong. Particle growth characteristics of metallic iron in direct coal-based reduction of nickel slag. Iron and Steel, 2020, 55(3): 104-109.
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2020, Vol. 55 
