Features of Pyrometallurgical Processing of Polymetallic Ores from the Chuktukon Deposit (Krasnoyarsk Territory)
M. V. PAVLOV1, I. V. PAVLOV1, V. F. PAVLOV2, O. V. SHABANOVA1, A. V. SHABANOV2
1Special Designing and Technological Bureau “Nauka”, Prospekt Mira 53, Krasnoyarsk 660049 (Russia)
2Krasnoyarsk Scientific Centre, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50, Krasnoyarsk 660036 (Russia)
Keywords: rare metal ores, reduction, separation of the melt, foamed silicate, acid leaching, oxalic acid, REM concentrate
Abstract
Features of pyrometallurgical processing of rare metal, practically undressable ores from the Chuktukon deposit (Krasnoyarsk Territory) are considered. It is proposed to use deep reductive melting of ore with brown coal as a reducing agent for rare earth metal (REM) concentrating. During reductive melting, the separation of the melt into the metal part and foamed silicate enriched with REM was carried out. The distribution of iron, manganese, niobium, titanium and REM in the metal and slag parts of the melt was analyzed. The features in the behaviour of iron during reductive melting were marked. It was shown that enrichment of the silicate part of the melt with rare earth metal oxides occurs in complete agreement with thermodynamic calculations. A correlation of lanthanum with cerium and neodymium was analyzed using the TM-3000 electron microscope, by means of mapping. The formed lanthanum-cerium associates (nuclei) are observed both in the vitreous phase and in foamed material (foamed silicate) as separate phases. The possibility of leaching rare earth metals with a weak solution of sulfuric acid was demonstrated; leaching becomes complicated due to the formation of silicic acid gel.
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