Abstract：Abstract：This paper mainly focuses on the ultra-pure iron concentrate with a grade of 71.58% iron obtained by fine
grinding，weak magnetic separation，reverse flotation and two-stage dehydration process，with a 68% iron concentrate
in marine sedimentary magnetite grade in Qinghai as raw material. The iron ore concentrate can directly produce reduced
iron powder with a total iron content of up to 98.7% through the primary reduction of hydrogen.The optimal experimental
conditions are as follows：hydrogen flow rate 1.5 m3/h，reduction time 1.5 h，reduction temperature 850 ℃.
高首坤，陈正，杨冬伟，武腾. 青海某磁铁矿超纯铁精矿粉直接还原实验研究[J]. 粉末冶金工业, 2020, 30(03): 36-39.
GAO Shou-kun，CHEN Zheng，YANG Dong-wei， WU Teng. Experimental study on direct reduction of ultra-pure iron concentrate in a
mining company in Qinghai. Powder Metallurgy Industry, 2020, 30(03): 36-39.
2020, Vol. 30 
