Formation and growth of iron grains in direct reduction process of high silicon and iron waste slag
ZHANG Xing-hua1, WANG Bin1, ZHAO Kai1, ZHANG Qiao-rong1, GONG Xiao-ran2, XING Hong-wei1
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China; 2. Chengde College of Applied Technology, Chengde 067000, Hebei, China
Abstract:A large amount of high silicon and iron waste slag was produced every year in the metallurgical industry. Copper slag is a typical high silicon and iron waste slag. Most of the copper slag has not been used effectively. In order to realize the extraction and resource utilization of valuable elements from copper slag, coal based direct reduction experiment was carried out. XRD diffraction, scanning electron microscopy and other testing methods were used. The effect of different stages and nucleating agent addition on the iron grain growth rule and distribution were investigated during the direct reduction of copper slag. The results show that when the reduction time was 30 min, the highest metallization rate was 78.40%, and the iron grain growth was the best, and the Fe element distribution was the most concentrated. Adding magnetite evidently increases the metallization rate in the reduction process. The highest metallization rate is 87.59% when the magnetite proportion ratio is 20%. The addition of nucleating agent magnetite reduced the nucleating barrier and promoted the Fe element concentration.
张兴华, 王彬, 赵凯, 张巧荣, 宫晓然, 邢宏伟. 高硅铁废渣直接还原铁晶粒形成与长大[J]. 钢铁, 2021, 56(6): 21-27.
ZHANG Xing-hua, WANG Bin, ZHAO Kai, ZHANG Qiao-rong, GONG Xiao-ran, XING Hong-wei. Formation and growth of iron grains in direct reduction process of high silicon and iron waste slag[J]. Iron and Steel, 2021, 56(6): 21-27.
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