Nurjaman, Fajar and Sari, Yuliana and Manurung, Posman and Handoko, Anton (2021) Study of Binary, Ternary, and Quaternary Basicity in Reduction of Saprolitic Nickel Ore. Trans Indian Inst Met. ISSN 0019-493X, 0972-2815 (In Press)

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Abstract

In the selective reduction process of lateritic nickel ore, the formation of the liquidus phase could be obtained by increasing the temperature and additive, resulting in an uneconomic process. Nevertheless, it could also be obtained by modifying the ore basicity by adding low-cost fluxes, such as CaO, SiO2, MgO, and Al. In this work, the effect of three types of basicity (binary, ternary, and quaternary) in selective reduction of saprolitic nickel ore on metallic grade and recovery, phase transformation,and microstructure of ferronickel was investigated clearly. The nickel ore, sodium sulfate, coal, and flux mixture was reduced to 1150 �C for 60 min. Then, the wet magnetic separation process was continued to separate ferronickel from impurities. The result showed that the optimum basicity for the selective reduction of saprolitic nickel ore was 0.6 of ternary basicity (CaO ? MgO/SiO ),modified by CaO addition. It produced 16.11% and 50.57% for nickel grade and recovery in concentrate, respectively. Modified basicity with CaO addition is more effective than MgO, Al2O3, and SiO22addition due to its ability to break the forsterite structure and release iron and nickel. It also could be reacted with magnesium silicate structure to form calcium-magnesium silicate structure such as mullite and monticellite. Keywords Saprolitic nickel ore � Basicity � Selective reduction � Ferronickel � Impurities

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Prodi Fisika
Depositing User: Mr Posman Manurung
Date Deposited: 11 Nov 2021 04:54
Last Modified: 11 Nov 2021 04:54
URI: http://repository.lppm.unila.ac.id/id/eprint/35911

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