Corresponding liquidus temperature and fluidity index of slag were 1300–1475 ☌ and above 4.5, respectively. Optimum basicity to produce iron nuggets using iron ore–coal composite pellets was 0.8–1.0, 0.4 and 0.8 for iron concentrate containing 2, 4 and 6–10 wt.% Al 2O 3, respectively.
The increase in fluidity index of slag resulted in a decline in the melting separation temperature and time of iron ore–coal composite pellets.
The results showed that relatively low or high liquidus temperature of slag had a negative effect on reduction and melting separation of iron ore–coal composite pellets. Using iron concentrate as raw material, the effects of slag basicity, Al 2O 3 and MgO on melting separation of iron ore–coal composite pellets, such as the melting separation temperature, the melting separation time, the morphology of melting separated product, and the recovery rate of iron nugget, were studied. In order to realize the efficient utilization of high Al 2O 3 iron ore resources, preparation of iron nuggets with high Al 2O 3 iron ore was studied.
Although the rotary hearth furnace iron nugget process cannot replace blast furnace process, which is affected by production scale, thermal efficiency and technical maturity, it is still a feasible technology for iron production. The rotary hearth furnace iron nugget process has advantages of short reaction time, high-quality reduced product and wide adaptability of raw materials and meets the trend in ecofriendly development of iron and steel industry.
0 kommentar(er)
