Metall. Res. Technol.
Volume 118, Number 4, 2021
|Number of page(s)||9|
|Published online||22 June 2021|
Effect of CaF2 on the aggregation and growth of ferronickel particles in the self-reduction of Nickel laterite ore
School of Mechanical Engineering, Yancheng Institute of Technology,
224051, PR China
2 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China
3 Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, PR China
4 Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources, Wuhan 430081, PR China
5 WISDRI Engineering and Research Incorporation Limited, Wuhan 430223, PR China
6 Hunan University of Technology, Zhuzhou 412000, PR China
* e-mail: firstname.lastname@example.org
Accepted: 2 June 2021
Increasing attention is being paid to the self-reduction and magnetic separation of nickel laterite ore because of economic and efficiency advantages. The aggregation and growth of ferronickel particles during the reduction process is an important factor for subsequent magnetic separation. In this study, the effect of CaF2 on ferronickel particle aggregation and growth during the self-reduction of nickel laterite ore was investigated by visual data analysis of ferronickel particles. The recovery and grade of Ni and Fe from the self-reduction, fine grinding, and magnetic separation of nickel laterite ore under the strengthening action of CaF2 were measured. Increasing CaF2 addition yielded a significant increase in the average particle size of ferronickel particles and an increased recovery of a higher grade of Ni. A ferronickel concentrate with 7.1 wt% Ni and 68.5 wt% Fe was obtained at a Ni recovery of 84.14% in the presence of 8 wt% CaF2. CaF2 accelerates the aggregation and growth of ferronickel particles, which promotes the separation of the ferronickel alloy from the gangue in the magnetic separation process.
Key words: Nickel laterite ore / Self-reduction / Magnetic separation / CaF2 / Aggregation and growth
© EDP Sciences, 2021
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