Preparation of Reduced Iron Powder from High-Phosphorus Iron Ore: A Pilot-Scale Rotary-Kiln Investigation

ABSTRACT

Dephosphorization is essential for utilizing high-phosphorus iron ore (HPIO), and this work prepared reduced iron powder via reductive roasting in a semi-industrial rotary kiln follower by magnetic separation. Under the conditions, reductive temperature of 1150°C, duration time of 60 min, mass ratio of briquettes to pea coal of 1:1, the reduced iron powder with an iron grade of 93.21% and phosphorus content of 0.13% was obtained, of which the corresponding iron recovery is 82.68% and dephosphorization ratio is 89.87%. The limestone reacted with gangue to form calcium aluminum silicate, preventing the reduction of phosphorate and in turn the formation of ferrophosphorus.

KEYWORDS:

• High-phosphorus iron ore
• reductive roasting
• phosphorus removal
• reduced iron powder
• rotary kiln

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/08827508.2023.2227326

Additional information

Funding

This work was supported by the Basic Science Center Project for the National Natural Science Foundation of China [No. 72088101].