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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Alumina & Bauxite
Presentation Title An Improved Lime Sinter Process to Produce Al2O3 from Low-grade Al-containing Resources
Author(s) Yongpan Tian, Xiaolin Pan, Haiyan Yu, Yuejiao Han, Ganfeng Tu, Shiwen Bi
On-Site Speaker (Planned) Xiaolin Pan
Abstract Scope The low-grade bauxites and non-bauxite resources are widely distributed, which is suitable to extract alumina by the lime sinter process. The application of the lime sinter process is restricted by the high consumption of calcium, the large amount of slag and the poor alumina leaching property of clinkers. An improved lime sinter process based on the dry-sintering is proposed by adding Na2O-containing compounds to decrease CaO addition and increase alumina leaching property. The molar ratios of CaO to Al2O3 and Na2O to Al2O3 are 0.6 and 0.4, respectively. Na4Ca3(AlO2)10 as well as trace amounts of CaO·Al2O3 and 12CaO·7Al2O3 is formed after sintering at 1200°C for 30min in CaO-Al2O3-Na2O system, the alumina leaching efficiency of which is above 90%. The minerals after sintering in CaO-Al2O3-SiO2-Na2O system include Na4Ca3(AlO2)10, 12CaO·7Al2O3, 2CaO·SiO2 and 2CaO·Al2O3·SiO2. The leaching efficiency of clinkers increases as the sintering temperature increases to 1300°C.
Proceedings Inclusion? Planned: Light Metals Volume


Alkalinity Precipitation Measurement on Carbonation of Bauxite Residue
An Improved Lime Sinter Process to Produce Al2O3 from Low-grade Al-containing Resources
Effect of Different Silica Mineral Compositions on the Digestion Results in Bayer Process
Effect of Lime Addition during Digestion on Stability of Digested Liquor of Diasporic Bauxite
Extraction of Alumina from the Magnetic Separation Tailings Derived from Reductive Roasting of Red Mud
Going FAR (Floating Alumina Refinery)
Industrial Implementation Characteristics of Aluminates Liquor Low-temperature Desilication Technology
Influence Factors of Stirring Speed of Self-stirring Tubular Reactor Used in Bauxite Digestion Process
Investigation of Flotation Behaviors of Refractory High Silica Bauxite
Leaching Kinetics for Recovering Alumina from Waste Tricalcium Aluminate Generated after Filtration of Bayer's Liquor
Reaction Behavior and Conversion of Anatase in Alumina Production Process with Calcification-carbonization Method
Research on Activated Alumina Obtained by Spray Pyrolysis Method
Study on Effective Extraction of Al and Fe from High-iron Bauxite through “Calcification-carbonization” Method
Study on the Influence of Chemical Additives during the Digestion of Bauxite
Sustaining Capital of Alumina Refinery Projects – Important but Unloved
Ways to Improve of Aluminium Content Raw Material Treatment by Sintering Method

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