Thermal Properties of High-Magnesia Oxidized Nickel Ore

Abstract:

The content of elements in the main mineral components of the ore, such as serpentine, talc, and chlorites, were determined. It was shown that, during heat treatment of the ore, in addition to the decomposition of hydrates and carbonates, serpentine decomposes and new phases (forsterite and enstatite) form. On the bases of analysis of the properties of the ore, patterns of phase transitions during heated in inert and reducing atmosphere were identified. It was found that the coal-thermal reduction of nickel and iron from oxides begins at temperatures above 800 °C, and from serpentines begins at temperatures above 1250 °C. It was found that, when heating the ore above 1200 °C in a mixture with a reducing agent, the metals reduce and form iron-nickel alloy. During electro-thermal smelting, the mode of which was determined by the melting points of slag (SiO₂ – MgO – FeO – CaO – Al₂O₃ system) and ferronickel, the ratio of Ni / Fe in the metallic phase was determined by the consumption of reducing agent (coal, coke).

• Periodical: Materials Science Forum (Volume 989)
• Pages: 461-467
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.989.461
• Online since: May 2020
• Authors: E.N. Selivanov, Svetlana V. Sergeeva*, R.I. Gulyaeva
• Keywords: Heating, Iron, Nickel, Ore, Phase Transitions, Reduction, Roasting, Thermal Properties

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