|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Alumina & Bauxite
||An Improved Lime Sinter Process to Produce Al2O3 from Low-grade Al-containing Resources
||Yongpan Tian, Xiaolin Pan, Haiyan Yu, Yuejiao Han, Ganfeng Tu, Shiwen Bi
|On-Site Speaker (Planned)
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.
||Planned: Light Metals Volume