1. State Key Laboratory of Advance Steel Processes and Products， Central Iron and Steel Research Institute， Beijing 100081， China 2. School of Material and Metallurgy， Northeast University， Shenyang 110819， Liaoning， China
Abstract：Effects of the direct reduction process on the nuggets size and recovery percent were investigated by coal-based direct reduction and leaching process， and the effects of [(w(CaO)/w(Al2O3))] on the slag composition and leaching rate of alumina were investigated by the same way. The results show that when the [(w(CaO)/w(Al2O3))] is 1.7， [w(C)/w(O)] is 1.4， reduction temperature is 1 450 ℃， and the reduction time is 20 min， the nuggets size is biggest and the nuggets recovery percent is highest， the nuggets size and recovery percent are 11.5 mm and 93%， respectively. When the [(w(CaO)/w(Al2O3))] is 1.0， the furnace slag is mainly composed of gehlenite (Ca2Al(Al，Si)2O7)， when the [(w(CaO)/][w(Al2O3))] is 1.5， the furnace slag is mainly composed of gehlenite (Ca2Al(Al，Si)2O7)， dicalcium silicate(Ca2SiO4) and mayenite(Ca12Al14O33)， when the [w(CaO)/w(Al2O3)] is 1.7-1.9， the furnace slag is mainly composed of dicalcium silicate(Ca2SiO4) and mayenite(Ca12Al14O33). When the [(w(CaO)/w(Al2O3))] is 1.7 and leaching time is 2.0 h， the leaching rate of alumina is highest which is 87.5%， the leaching rate is increased by 9.4% than that of 0.5 h leaching time. Therefore， when the furnace slag is mainly composed of dicalcium silicate(Ca2SiO4) and mayenite(Ca12Al14O33)， it is more conducive toleaching of alumina.
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2015, Vol. 50 
