title: Mechanism of sodium chloride in promoting reduction of high-magnesium low-nickel oxide ore.
abstract: Sodium chloride has been proved that it is an effective promoter for the reduction of high-magnesium, low-nickel oxide ore. The aim of current work is to clarify the promotion behavior of sodium chloride in the roasting reduction process. The influence of moisture on the reduction of ore in the presence of sodium chloride is studied to get clear comprehension of promotion process. In the presence of moisture, the HCl is produced by pyrohydrolysis of sodium chloride for chlorinating nickel and iron oxides, moreover, interactions between metallic oxides and sodium chloride are also a way for chlorination at high temperature (>802 °C); subsequently, the metal chloride would be reduced by reductant. In the absence of moisture, the magnetic separation results show that the recoveries of iron and nickel have a significant increase; moreover, olivine structure would be destroyed gradually with the increase of roasting temperature in the action of sodium chloride, and the sodium chloride existed in high-magnesium, low-nickel oxide ore could make the NiO isolate from NiO-bearing minerals. The NiO reacts with Fe2O3 at high temperature to form NiFe2O4, which is conductive to the formation of Ni-Fe alloy during the reduction process.
authors.affiliation: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Shiwei
authors.initials: S
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.affiliation: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
authors.forename: Baozhong
authors.initials: B
authors.lastname: Ma
authors.affiliation: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Chengyan
authors.initials: C
authors.lastname: Wang