关键词: 含碳球团, 低配碳, 低温熔分, 渣铁分离, 铁粒

Abstract: The melting separation of metal and slag was investigated by direct reduction of ore-coal composite pellet at low nC/nO followed by melting separation at low temperature. The results showed that a small quantity of slag (2FeO·SiO2) exists in iron nugget at 1300°C, nC/nO=0.8 and 55 min of reduction-melting time. When the reduction-melting time is 60 min, the metal and slag are completely separated, and almost no slag exists in iron nugget. For the ore-coal composite pellet of nC/nO=0.8 or 0.85, the mass fraction of FeO in slag is relatively higher, the melting point is lower and the slag is easy to be separated from metal after reduction. For the ore-coal composite pellet of nC/nO=0.9, the mass fraction of FeO in slag is lower and the melting point is higher, and the slag is not easy to be separated unless heating at higher temperature or for longer melting time. When nC/nO=0.8, and reduction-melting time is 60 min at 1320°C, the recovery rate of iron is greater than 86.1%, and the mass fraction of iron in iron nugget is about 94.8%.