Recycling of High Ferrous Bauxite Reducing Slag for Synthesis of CaAl_2Si_2O_8-Al_2O_3-CaAl_(12)O_(1

• 作 者: Ying-yi ZHANG Yuan-hong QI Zong-shu ZOU
• 机 构: College of Materials Science and Engineering,Chongqing University,State Key Laboratory of Advanced S
• 出 处: Journal of Iron and Steel Research(International)
• 发表日期: 2016年12期
• 关键词: bauxite sintering polygonal oxidizing shaped transformed ferrous metallic alumin

CaAl_2 Si_2 O_8-Al_2O_3-CaAl_(12) O_(19)( CAS_2-Al_2O_3-CA_6) composite was synthesized through reaction sintering alumina and bauxite reducing slag.The CAS_2-Al_2O_3-CA_6 composite was mainly composed of α-Al_2O_3,CAS_2,and CA_6.Gehlenite( Ca_2Al_2 SiO_7,C_2AS) phase was effectively transformed to CAS_2 and CA_6through high-temperature reaction sintering under weak oxidizing atmosphere at 1400 ℃ for 4h.SEM( scanning electron microscopy) and EDS( energy dispersive spectroscopy) analysis indicated that black and needle-shaped Al_2O_3,rhombic or irregular polygonal-shaped Fe Al_2O_4,and glassy phase Ca_2Al_2 SiO_7disappeared after the reaction sintering.The light gray and flaky hexagon crystals of Ca Al_(12)O_(19)(10μm) and the grainy particles of Al_2O_3( 2-7μm) were observed in the CAS_2-Al_2O_3-CA_6 composite.The gray crystals of CAS_2 act as the binding phase and are distributed around CA_6 and Al_2O_3.CAS_2-Al_2O_3-CA_6 composite exhibits high refractoriness and service temperature,which are 1650 ℃ and 1450 ℃,respectively.Reaction sintering of alumina and bauxite reducing slag is a feasible method for the synthesis of CAS_2-Al_2O_3-CA_6 composite.

CaAl_2Si_2O_8-Al_2O_3-CaAl_ (12) O_ (19) (CAS_2-Al_2O_3-CA_6) composite was synthesized through reaction sintering alumina and bauxite reducing slag.The CAS_2-Al_2O_3-CA_6 composite was mainly composed of α-Al_2O_3, CAS_2, and CA_6.Gehlenite (Ca_2Al_2 SiO_7, C_2AS) phase was effectively transformed into CAS_2 and CA_6through high-temperature reaction sintering under weak oxidizing atmosphere at 1400 ℃ for 4h.SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy) analysis indicated that black and needle-shaped Al_2O_3, rhombic or irregular polygonal-shaped Fe Al_2O_4, and glassy phase Ca_2Al_2 SiO_7 doped after the reaction sintering. The light gray and flaky hexagon crystals of Ca Al_ (12) O_ (19) (10 μm) and the grainy particles of Al_2O_3 (2-7μm) were observed in the CAS_2-Al_2O_3-CA_6 composite.The gray crystals of CAS_2 act as the binding phase and are distributed around CA_6 and Al_2O_3.CAS_2-Al_2O_3-CA_6 composite exhibits high refractoriness and service tempera ture, which are 1650 ° C and 1450 ° C, respectively. Reaction sintering of alumina and bauxite reducing slag is a feasible method for the synthesis of CAS_2-Al_2O_3-CA_6 composite.