Oxidation Roasting, Gas-based Reduction Followed by Magnetic Separation of a High Phosphorus Iron Ore in Africa

WU Shichao; GAO Ruizhuo; SUN Tichang; HUANG Wusheng; YAN Li

doi:10.3969/j.issn.1000-6532.2024.01.018

2024 No. 1

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Article navigation > Multipurpose Utilization of Mineral Resources > 2024 > 45(1): 144-148, 154

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WU Shichao, GAO Ruizhuo, SUN Tichang, HUANG Wusheng, YAN Li. Oxidation Roasting, Gas-based Reduction Followed by Magnetic Separation of a High Phosphorus Iron Ore in Africa[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(1): 144-148, 154. doi: 10.3969/j.issn.1000-6532.2024.01.018

Citation:

WU Shichao, GAO Ruizhuo, SUN Tichang, HUANG Wusheng, YAN Li. Oxidation Roasting, Gas-based Reduction Followed by Magnetic Separation of a High Phosphorus Iron Ore in Africa[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(1): 144-148, 154. doi: 10.3969/j.issn.1000-6532.2024.01.018

Oxidation Roasting, Gas-based Reduction Followed by Magnetic Separation of a High Phosphorus Iron Ore in Africa

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Qingdao Venus Mining Co., Ltd., Qingdao 266748, Shandong, China
3.
Sinosteel Equipment Co., Ltd. Beijing 100080, China

More Information

Corresponding author: SUN Tichang, suntichangustb@126.com

Received Date: 10 May 2021

Publish Date: 25 February 2024

Abstract

Abstract

This is an article in the field of metallurgical engineering. In view of the problems of low compressive strength and high reduction temperature in the gas-base reduction of a high-phosphorus iron ore, a new process of oxidation roasting, gas-based reduction followed by magnetic separation was proposed. The effect of oxidation temperature and the types and dosages of dephosphorization on the compressive strength of the oxidized pellets were investigated, and the conditions of oxidation roasting that met the strength requirements of the shaft furnace were found. On this basis, the effects of reducing temperature, total reducing gas flow rate, reducing gas composition and reducing time on iron recovery and dephosphorization were studied. The results showed that under the conditions of 10% Na₂CO₃ dosage, oxidation temperature 1200 ℃, oxidation time 60 min, reduction temperature 950 ℃, flow rates of H₂ and CO were 3.75 L/min and 1.25 L/min, respectively, and reduction time 180 min, Iron grade, iron recovery and phosphorus content were 91.15%, 93.07% and 0.14%, respectively. The SEM results show that the phosphorus in the powdered reduced iron exists in the form of mechanical inclusions, and the phosphorus is removed by grinding-magnetic separation.
- Metallurgical engineering /
- High phosphorus iron ore /
- Oxidation roasting /
- Gas base reduction /
- Magnetic separation

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References

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