Study on improving reducibility of iron concentrate powder by adding coal
LI Yalong1.，LIU Weidong2.，MA Chunyuan2.
（1.Hebei Yangang Technology Co., Ltd，Tangshan 064410，China；2. Shandong University, Institute for Energy
and Environmental Research，Jinan 250100, China）
Abstract：With the gradual tightening of environmental protection and energy-saving policies in recent years, the
structure of blast furnace burden has undergone significant changes, mainly due to the significant difference in met‐
allurgical properties between pellets and sintered ore, which has had a certain impact on the stability and economic
and technical indicators of blast furnaces. The ratio of iron concentrate powder and coal powder, as well as the
reduction degree achieved by iron concentrate powder under different atmospheres and temperatures were investi‐
gated. The results show that under the same reduction temperature and atmosphere, the reduction degree and metal‐
lization rate of the iron concentrate powder mixed with coal particles increase with the increase of coal content.
This indicates that the C content in coal has a significant impact on the reduction degree of iron concentrate pow‐
der. When the coal content is 15%, the reduction degree of the reduced sample increases. The metallization rate
reaches over 97%, and the continued addition of coal powder has no significant impact on the results. The Fe2+ con‐
tent of the reduced sample decreases with the increase of coal content. When the reduction atmosphere and coal
content are the same, the reduction temperature is different, the reduction degree and metallization rate increase
with the increase of temperature. The reduction degree tests at 900 ℃ is below 97%. When the reduction tempera‐
ture and coal content are the same, the reduction degree and metallization rate increase with the increase of CO concentration. After reduction, holes and pits appear on the surface of the sample, forming a dense iron layer with co‐
lumnar iron whiskers. The main component of the sample is C, which may be due to the coal powder falling off
from the iron ore powder during the high-temperature reduction process, and the combination is not tight enough.
The experiment provides accurate data such as reduction temperature, reduction atmosphere, and coal blending
amount for the actual production process, which can save energy and reduce costs.
李雅龙，刘卫东，马春元. 铁精粉通过掺煤提高还原性的研究[J]. 粉末冶金工业, 2023, 33(03): 125-132.
LI Yalong，LIU Weidong，MA Chunyuan. Study on improving reducibility of iron concentrate powder by adding coal. Powder Metallurgy Industry, 2023, 33(03): 125-132.
2023, Vol. 33 
