Prix du meilleur article de la Section pyrométallurgie des métaux
Le Prix du meilleur article de la Section pyrométallurgie des métaux a été créé pour récompenser le meilleur article publié sur ce sujet dans le Journal de l’ICM, dans le Canadian Metallurgical Quarterly ou des délibérations de la Conférence des métallurgistes de l’année précédente. La Section sélectionne le meilleur article et le sous-comité de remise de prix examine les nominations.
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Recycling Ferronickel Concentrates as an Iron Source to Extract Nickel from Nickel Sulphide Concentrates
Fanmao Wang, Sam Marcuson, Mansoor Barati and Leili Tafaghodi
COM 2021-WALSIM symposium
The conventional nickel extraction from sulphide nickel ore consists of smelting and refining, producing high purity metallic nickel products. The limit of the traditional extraction process is the significant cost of SO2 abatement, disposal of by-products (e.g., slags), and complex refining treatment. With the interest of reducing SO2 emissions and simplifying the extraction process, the authors investigated a solid-state (800 oC) thermal treatment of nickel sulphide concentrates in the presence of metallic iron under a neutral atmosphere. The results showed that approximately 97% of Ni was extracted into ferronickel (FeNi) particles with d80 = 45 µm. Recycling these FeNi particles as an iron source yielded new FeNi precipitations in the sulphide matrix with d80 = 20 µm. The Ni concentration in the resulting sulphide phase was in the range of 1–3 wt%. Optimization is required to use the recycled FeNi particles as seeds to increase the size of newly precipitated alloy particles.
Trace Element Distributions Between Matte and Slag in Direct Nickel Matte Smelting
Sukhomlinov, D., Klemettinen, L., Virtanen, O., Lahaye, Y., Latostenmaa, P., Jokilaakso, A., & Taskinen, P.
(2020) Canadian Metallurgical Quarterly, 59(1), 67-77.
The behaviour of trace elements in the nickel matte smelting was studied at 1673 K (1400°C) by equilibration-quenching techniques followed by direct phase analyses using electron probe X-ray microanalysis and laser ablation inductively coupled plasma-mass spectrometry. The matte-slag samples at silica saturation were equilibrated with SO2-CO-CO2-Ar mixtures of fixed pSO2, pS2 and pO2 in order to obtain a pre-determined oxidation degree for the sulphide matte, and thus to generate a targeted iron concentration of the nickel-copper–iron sulphide matte (Ni: Cu = 5, w/w), depending on the slag chemistry. The slag composition was varied from 0 to 2 wt-% K2O and 0–10 wt-% MgO in silica saturation. The studied trace elements were Co, Ge, Pb, Se and Sn, but also the matte-to-slag distributions of the slag forming fluxing components Mg (MgO) and Si (SiO2) were determined experimentally. Selenium was the only trace element studied which strongly enriched in the low-iron nickel mattes, and the deportment became larger when the sulphide matte depleted with iron. All the other trace elements behaved in the opposite way.