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2017, vol. 53, br. 1, str. 3-15
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Iskorišćenje nikla iz šljake dobijene iz elektrolučne peći magnetnom separacijom
Nickel recovery from electric arc furnace slag by magnetic separation
National Technical University of Athens (NTUA), School Mining Engineering and Metallurgy, NTUA Campus, Zographou, Greece
e-adresa: ganastas@metal.ntua.gr
Ključne reči: magnetna separacija; iskorišćenje metala; ležište nikla sa lateritom; metalurgija nikla; niklova šljaka (šljaka koja sadrži Ni)
Sažetak
Tokom pirometalurškog procesa ležišta nikla sa lateritom u topionici LARCO GMMSA, nakon postupka u elektrolučnoj peći,dobija se šljaka koja sadrži 0,10 % i 0,20 % Ni. Ako se uzme u obzir da se tokom jedne godine dobije velika količina šljake, iskorišćenje nikla iz šljake dobijene iz elektrolučne peći može doprineti celokupnom procesu. Cilj ovog rada je da ispita mogućnosti iskorišćenja nikla iz šljake dobijene iz elektrolučne peći magnetnom separacijom. Da bi se ispunio cilj, ispitan je uticaj sledećih parametara: veličina zrna, jačina magnetnog polja, debljina sloja šljake, sadržaj vlažnosti i ponovno usitnjavanje većih komada šljake. Rezultati pokazuju da je moguće dobiti magnetni produkt u kome je sadržaj Ni isti ili čak i veći nego u primarnoj sirovini, sa dovoljnim iskorišćenjem nikla.
Abstract
During the pyrometallurgical treatment of the nickel-bearing laterite in the plant of G.M.M. S.A. LARCO, slag is produced after treatment in electric-arc furnace (EAF) that contains 0.10 to 0.20 % Ni. Taking into account the great quantity of slag produced per year, the recovery of nickel from the EAF slag will add benefits to the entire process. The target of the current work is to investigate the possibility of nickel recovery from EAF slag by magnetic separation. To meet the target, the effect of the following parameters was studied: grain size, magnetic field intensity, thickness of slag layer, moisture content, and re-grinding of the coarser slag particles. The results show that it is possible to obtain a magnetic product with nickel grade close to that of the primary raw material or even better, with sufficient nickel recovery.
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