Technology adopted at AO Noril'skii Nikel' and AO Kombinat Severonikel' entails subjecting nickel concentrate cinder produced by calcination in fluidized bed furnaces to reduction with hydrogen in rotary tube furnaces to obtain partially reduced nickel monoxide with 20-30 percent chemical reactivity and approx 65 percent cinder metallization. The semireduced nickel monoxide is employed to produce nickel anodes by direct reductive electric melting. The existing technology for producing reduced nickel monoxide in rotary tube furnaces does not permit production of material with a high degree of metallization and high activity, because of the high reduction temperature (fusing of the reduced material onto the surface of the grains and its compaction) and attendant restriction of reducing gas access to the interior of the nickel monoxide grains.
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