Effect of reducing agent species on reduction and slag-metal separation from carbon composite pellets

摘要

The rotary hearth furnace iron nugget process has advantages of short reaction time and high quality product. Using semi-coke, bituminous coal, anthracite, charcoal and coke as raw material, effects of reducing agent species on reduction and melting separation of carbon composite pellets were studied. Results showed that reducing agent species had a great influence on reduction and melting separation behaviors of carbon composite pellets. Bituminous coal as the reducing agent could lead to the best reducing effect, but it played a negative role in slag-metal separation. For comprehensive consideration of economic benefits, melting separated quality and energy consumption, optimum reducing agent was semi-coke. Optimum reduction temperature and melting separated temperature was 1200°C and 1375°C respectively. Under this condition, the recovery rate of metallic iron could reach 92%.