Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 30, Issue 3, Pages 812-822Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(20)65256-6
Keywords
laterite nickel ore; deep reduction; magnetic separation; nickel-iron concentrate; reduction mechanism
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Funding
- National Natural Science Foundation of China [51904058, 51734005]
- National Key Research and Development Program of China [2018YFC1901901902]
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The process of deep reduction and magnetic separation was proposed to enrich nickel and iron from laterite nickel ores. Results show that nickel-iron concentrates with nickel grade of 6.96%, nickel recovery of 94.06%, iron grade of 34.74%, and iron recovery of 80.44% could be obtained after magnetic separation under the conditions of reduction temperature of 1275 degrees C, reduction time of 50 min, slag basicity of 1.0, carbon-containing coefficient of 2.5, and magnetic field strength of 72 kA/m. Reduction temperature and time affected the possibility of deep reduction and reaction progress. Slag basicity affected the composition of slag in burden and the spilling and enriching rate of nickel-iron from a matrix to form nickel-iron particles. Nickel-iron particles were generated, aggregated, and grew gradually in the reduction process. Nickel-iron particles can be effectively separated from gangue minerals by magnetic separation.
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